Disease Caused by Heavy Metals and Dust: A Review

Vipin Kumar, Sneha Pandey, Nidhi Ruhela, Shabnam Ain*, Qurratul Ain, Chhavi Nagar, Babita Kumar, Anshika Sharma, Himani Tomar, Bhuvnesh

Sanskar College of Pharmacy and Research, Ghaziabad Uttar Pradesh 201015.

 *Correspondence: snehapandey39296@gmail.com

DOI: https://doi.org/10.71431/IJRPAS.2026.5108

INTRODUCTION

According to Kiran (2021), heavy metals are a heterogeneous set of elements with a range of chemical characteristics and functions. The transition elements [4] comprise the majority of heavy metals [9], which are distinguished by their high density [9] and atomic weight. Physically speaking, metals with an atomic number larger than 20 and a specific weight greater than 5 g/cm³ are referred to as heavy metals. [4,9,11]

There are two types of heavy metals: non-essential (Cd, Ni, As, Hg, Pb) and essential (Mo, Mn, Cu, Ni, Fe, Zn). [9] The body needs key metals to sustain its metabolism. For example, copper is necessary for the production of hemoglobin and the metabolism of carbohydrates; nevertheless, an excess of these metals can lead to cellular damage. [1] These metals exhibit toxicity when present in higher concentrations than necessary. [7] Human health is impacted by critical heavy metal deficiencies, but even modest amounts of non-essential metals can have Harmful effects. [9, 1]

Metals are a significant class of harmful compounds that people come into contact with daily in both occupational and environmental settings. [7,10] By displacing the original metals from their normal binding sites, these metals attach themselves to protein sites rather than their designated metals. This leads to cellular dysfunction and eventual poisoning. Because of the widespread exposure to these hazardous agents due to the increased daily variety of metal settings try daily life, the effects of these agents on human health are currently the subject of intense study. [2]

According to the World Health Organization (WHO), it is caused by one-quarter of sick people's long-term exposure to environmental pollution today. Heavy metals' negative effects on environmental health worsen when they are transferred between ecosystems, either directly or indirectly. [4]

The economy of Meerut city scissors and sports ventures hold significant status and the scissors fabricating businesses give work to no less than 3% populace of the city. Heavy metals are chemical elements that have specific gravity at least 5 times that of water. [1] Heavy metals enter the human body through a variety of routes, including contaminated food, water, skin, and inhalation. [10,12] These metals absorbed through the intestine are mostly water soluble and are transported to various organs via the circulatory system. Heavy metals, however, affect the respiratory tract and many cells such as endothelial, epithelial, and others at low concentrations. [1] Individuals might interact with metals in modern works. Scissors-producing ventures are one of them. In this way, the current review was done to track down the predominance of lung illness among laborers, working in various divisions of ventures. [1] This review mainly focuses on problems associated with the deposition of heavy metals and dust, and preservative measures taken by the industries producing heavy metal dust to reduce the associated human problems.

Effects of Heavy Metals on Human

Humans who breathe in air pollution are exposed to heavy metals. [4] Heavy metals are widely distributed throughout the environment as a result of many residential, industrial [8], medicinal, agricultural, and technical uses. [2] There are far too many potential health hazards associated with metal exposure. The reason for this is that metals have a propensity to be absorbed by the body, build up, and biomagnifies, which means they can cause several illnesses. [4] Trace elements (Ar, Co, Cr, Cu, Fe, I, Mn, Mo, Ni, Se, V, and Zn) are essential for maintaining the creation of the skeletal structure, controlling the acid-base balance, and supplying the primary elements needed to maintain the colloidal system. [4] In the current scenario arsenic, cadmium, chromium, lead, and mercury are ranked as priority metals because of their high degree of toxicity which is becoming a major public health concern. These metallic elements are measured in systemic toxicants because they are known to induce multiple organ damage, even at very low exposure. [2]

The concentrations of these metals “in certain media and the length of exposure. Even at low quantities of hazardous metals, long-term and chronic exposure may cause health problems. [5] Continuing exposure to some metals may lead to progressively progressing physical, muscular, and neurological degenerative processes that replicate diseases such as multiple sclerosis, Alzheimer's disease, Parkinson's disease, and muscular dystrophy. Frequent long-term exposure to some metals and their compounds may even cause cancer [2]. However, in general, all metals affect multiple organs and systems. [4] For all heavy metals, the tolerable concentration limits according to the United States Environment Protection Agency (US-EPA) and the 23 World Health Organization (WHO) range from 0.01 to 0.05 mg /L in natural waters. [4] The redundancy and toxicity effects of a metal depend on swallowing or inhaling the metal, the entry speed of the metal, tissue distribution, the concentration acquired, and the discharge speed of the metal. [4] Toxicity mechanisms include inhibition of the enzyme activity, protein synthesis, variations in the nucleic acid function, and changes in the cell membrane transmittance. [4] Hence detailed knowledge/information about heavy metals is rather significant for allowing appropriate defensive measures against their excessive contact with the human body. [2]

Cadmium and its effects

One extremely hazardous heavy metal is cadmium. [1,11] Due to its widespread distribution, toxicity, and extended half-life, cadmium is ranked seventh among all heavy metals in the world by the Agency for Toxic Substances and Disease Registry (ATSDR). [4,14] Once ingested, cadmium builds up within the body of a person or an animal over time. Human beings may get primarily exposed to this toxic heavy metal via inhalation and ingestion [9,2] and can cause acute to chronic intoxications. [2,13] Its accumulation in the human body may lead to renal dysfunction [11], pulmonary [11], hepatic  [16] and skeletal damage, [11,16] reproductive failure [16], and even cancer development. [11,13,15 ] [4] Cadmium is identified as [1] group 1 carcinogen carcinogens [4], by The International Agency for Research on Cancer and the US National Toxicology Program. [1,16]

Cadmium accumulates in biological systems and leads to toxicity [10,4] carcinogen carcinogenic radical formation. [4] Cd interacts with essential elements like An, Fe, Ca, Mg, and Se can cause and morphological changes [16] in many organs and also disturb metabolism. [1] It also causes neurcausesnerative defects, including amyotrophic lateral sclerosis, Parkinson's, Alzheimer's [9,13], and multiple sclerosis. Neurotoxicity disturbingium arise from arisesal cell death via apoptosis. [5] Cadmium-induced nephrotonephrotoxicities cause severe clinical manifestations of aminoacsuchaciduriaa, phosphaturia, Fanconi-like syndrome, and glucosuria. [5] Higher concentrations of it build up in the proxymal tubular cells [2], which can lead to glucosuria [15], aminoaciduría, 32-microglobumicroglobulin a significant amount of cadmium in the urine. [5]

Additionally, excessive exposure can result in renal tubular acidosis, renal failure, and hypercalciuria [5], as well as bone mineralization (by bone injury or renal dysfunction). [2]

Acute exposure to cadmium causes it to concentrate in the liver. [5] Depending on the circumstances of exposure, cadmium exposure at work or in the environment may have immunosuppressive effects. [5]

Low to moderate cadmium exposure causes hypertension [5] by binding with metallothionein. [16] Cadmium targets T cells [cytotoxic K (killer) cells], NK (natural killer cells), macrophages, and B cells. [1] Diabetes, peripheral arterial disease, myocardial infarction, stroke, and heart failure are among the conditions it causes. [5] Important factors include the size and solubility of the inhaled cadmium-containing particles as well as the respiratory tract's absorption of the cadmium. Blood absorbed 7% to 40% of the breathed cadmium particles. The relationship between the size, solubility, and value of cadmium particles was inverse. Of the cadmium that is breathed, 40–50% is absorbed [16], whereas 3–7% is absorbed by absorption. Cadmium binds to protein 34 via erythrocytes or albumin after absorption. [5] Lung cancer is caused by prolonged exposure to cadmium. [1] According to Sevtap Tirink (2021), the placenta, bones, adrenal glands, pancreas, and testicles all accumulate cadmium. Because tobacco is the primary source of cadmium absorption in smokers, smokers are more likely than non-smokers to become intoxicated with the element. [2] According to Sevtap Tirink (2021), cadmium poisoning results in apoptosis, [15] DNA damage [15], and stress. It also turns healthy epithelial cells into cancerous cells and makes them carcinogens. [1]

Chromium and its effects

In nature, chromium may be found in rocks, dirt, animals, and plants. [7] It can also exist as a liquid or gas. As the seventh most prevalent element on Earth, chromium may be found in the environment in a variety of oxidation states, ranging from Cr 2+ to Cr 6+ (2019). Trivalent Cr2 and hexavalent Cr are two types of Cr that are often found (2019); both are harmful to people, animals, and plants [2] According to Sevtap Tirink (2021), the half-life of Cr in human serum is 40 months, whereas in humans, it is 129 months. According to Dr. Showkat Ahmad Bhat (2019), chromium is naturally produced by the burning of coal and oil, petroleum-derived from ferrochrome refractory material, pigment oxidants, catalysts, fertilizers, chromium steel, drilling oil wells, and metal plating tanneries. Chromium is released into the environment through the use of contemporary agricultural practices and industry, which leaves behind chromium residues. Chromium excess that exceeds the allowable limit is vital to plant life since it hurts the biological system. Because chromium poisoning affects the components of these enzymes, such as peroxidases, catalase, and cytochrome oxidases, they function correctly in the presence of iron. [2] Because of its greater water solubility (2022), strong oxidizing ability (2022), and permanence, chrome (VI) is readily absorbed in the respiratory, gastrointestinal, and cutaneous tracts and can be harmful to other organs. [4] There is additional evidence linking those who labor in the mining and consumption of Cr to an increased risk of cancer. In both live and cultured cells, Cr (VI) results in a broad variety of structural alterations to the genetic material, such as nucleotide strand breakage(2022), inter-DNA strand cross-links, and DNA chromosomal protein crosslinks. [5]

Chromium VI compounds such as lead, zinc, strontium, and calcium chromates are extremely hazardous and carcinogenic. [2] Cancers of the bladder, stomach, prostate, brain, skin, liver, and kidney are among them. [2] However, due to its critical function in glucose metabolism, chromium III is a necessary nutritional supplement for both humans and animals [2]. Numerous negative consequences of chromium have on the human immune system (2022). Elevated levels of hexavalent chromium inhibit the humeral immune response and the phagocytic function of alveolar macrophages. Furthermore, two forms of hypersensitive responses are induced by chromium: type I, which is anaphylactic, and type IV, which is delayed. [5] It is acknowledged that the main mechanisms of chromium (VI) carcinogenicity are genotoxicity and DNA damage. [4]

Ulcers that develop as a result of exposure to chromium compounds (2019) may last histology and heal very slowly. Among chromate workers, nasal septal ulcers are quite prevalent. Increased chromium compound levels in people can block the erythrocyte glutathione reductase enzyme, which reduces the ability of methemoglobin to be converted to hemoglobin. [2]

Acute and long-term severe dermatological effects, such as systemic contact dermatitis, skin cancer, and contact dermatitis, are brought on by chromium exposure. Due to repeated dermal contact with allergens (haptens), contact dermatitis is a frequent skin condition marked by delayed hypersensitivity. A kind of dermatitis known as systemic contact dermatitis is brought on by an allergen's systemic exposure, which first makes the skin sensitive through direct dermal contact. [5]

Cr (VI) can cause damage to the liver and histological alterations such as necrosis, parenchymatous degeneration, and hepatocytes.

Steatosis. Cr (VI) hepatotoxicity is linked to increased ROS levels, lipid peroxidation, and suppression of DNA, RNA, and protein synthesis, DNA damage, decreased antioxidant enzyme activity, and mitochondrial dysfunction, including apoptosis, cell growth arrest, and impaired mitochondrial bioenergetics. [5]

Copper and its effects

Both in eukaryotes and prokaryotes, copper are required for a variety of metabolic activities. It is an important ingredient that is needed for hemoglobin formation and is present in most enzymes. Copper finds particular application in the creation of electric machinery, alloys, chemical catalysts, dyes, and wood preservatives. It is used to manage some illnesses, ectoparasites that harm aquatic life, and unwanted algae. An organism can become contaminated with copper by breathing in air, drinking water, eating, or coming into touch with substances containing copper on its skin.

When present in 50–120 mg, it is a necessary component for amino acids, fatty acids, vitamins, and processes in the metabolism under normal circumstances. [4] When too much copper gets into the brain, it slows down neurodevelopment. Wilson's illness is a genetic disorder that results in neurobehavioral problems akin to schizophrenia and is caused by excess copper retention [5] Consuming too much copper causes harmful health effects such as kidney and liver damage. [4]

Lead and its effects

According to Ruchi Bharti (2021), lead is regarded as a hazardous heavy metal. Its half-life in the bloodstream is just 36 days, whereas in bones, it can last for 20 to 30 years. [4] Lead is a health risk to humans and may be found in varying concentrations in the soil, water, air, and most everyday things. [4] According to Dr. Showak Ahmad Bhat (2019), the primary sources of lead exposure are industrial processes, food and smoking, drinking water, domestic sources, and everyday household sources like gasoline and house paint. [7] Lead exposure has also been linked to lead bullets, pewter pitchers, plumbing pipes, toys, storage batteries, and faucets. Both organic and inorganic forms are accessible. [4]

Lead is released into the environment by coal, tin, and iron mining, automobile emissions, lead melting, burning fossil fuels, burning lead 6-5 wastes, pigment and dye manufacturing, steel goods, steel welding, and spray spraying. [4] The daily consumption of lead in humans can vary from 20 to 400 mg. The Provisional Tolerable Weekly Intake (PTWI) has been set at 3000 mg by the World Health Organization and the United Nations Food and Agriculture Organization. However, it was agreed that the safe limit for youngsters was half of the previously specified quantity. [4]

In many parts of the world human vehicle exhausts release tons of lead into the atmosphere each year, some of which is taken up by plants, fixes itself to soil, and flows into water bodies. As a result, the general public's exposure to lead comes from either eating or drinking water. [2] Lead is ingested in amounts of 30%–40%, of which 5%–10% are absorbed into the blood. According to Sevtap Tirink (2021), 1% of it stays in serum, 99% of it binds to red blood cells, and 30% to 50% of it is absorbed in the gastrointestinal system in children.

Both acute and long-term exposure to lead have a number of detrimental effects on the immune system and trigger a variety of immunological reactions, including a rise in allergies, infectious illnesses, autoimmune disorders, and cancer. [5] Children in the 0–5 age range who are Pb deficient experience impacts on their neurodevelopment. [3] Chronic lead exposure has been linked to neurological damage [5], dyslexia, birth deformities, hyperactivity, allergies, mental retardation, psychosis, autism, paralysis, weight loss, and muscle weakness. [2]

Lead can compete with calcium for binding at picomolar concentrations on the binding sites of cerebellar phosphokinase C, which can alter neural signals. [3] All organs are negatively impacted by lead, but the kidneys are most severely affected. Fanconi-like syndrome is brought on by proximal tubular dysfunction, which is brought on by acute lead nephropathy. Hyperplasia, interstitial fibrosis, tubule atrophy, renal failure, and glomerulonephritis are some of the symptoms of chronic lead nephropathy. [5]

Because Pb enters infants through the placenta in a pregnant woman's uterus, Pb exposure raises major concerns. [3] Long-term lead exposure is associated with a higher risk of cardiovascular disorders, albeit this association is yet unknown. [4] By increasing OS, decreasing NO availability, increasing vasoconstrictor prostaglandins, changing the renin-angiotensin system, lowering vasodilator prostaglandins, interfering with vascular smooth muscle Ca2 signaling, elevating inflammation and endothelium-dependent vasorelaxation, and modifying the vascular response to vasoactive agonists, chronic exposure to lead may result in arteriosclerosis and hypertension, thrombosis, atherosclerosis, and cardiac disease. [3] It has various detrimental impacts on health, including nephrotoxicity and neurotoxicity. Children who are exposed to lead poisoning may also see a decline in their IQ (intelligence quotient) and cognitive development. [4]

Lead (Pb) can produce two different forms of anemia: hemolytic anemia, which is caused by high levels of exposure to lead, and Frank anemia, which is caused by prolonged blood lead elevation. [3]

Chronic lead exposure may be harmful to liver cells, causing cellular infiltration and glycogen depletion that can lead to chronic cirrhosis. [5] Lead has an impact on both male and female reproductive systems. According to Ruchi Bharti (2021), it causes miscarriage, early membrane rupture, preterm birth, and infertility in females and decreases libido, chromosomal damage, altered testosterone levels, abnormalities in spermatogenesis, and infertility in males.

Lead exposure stimulates MHC activation in addition to B and T cell production. By altering the function of T-cells and raising vulnerability to the emergence of autoimmunity and hypersensitivity, it can affect cellular and humeral responses. [5]

Although avoidable, lead poisoning still poses a serious risk because it can damage most organs and even be fatal. [2] According to the Environmental Protection Agency (EPA), lead is a powerful carcinogen that damages DNA repair mechanisms, genes that regulate cellular tumors, and chromosomal structure and sequence by releasing reactive oxygen species (ROS). [5] Lead's distribution in the body is primarily dependent on blood flow in different tissues, and approximately 95% of it is deposited in the skeletal bones as insoluble phosphate. [2]

Because ROS destroy proteins, cell membranes, and lipids structurally, they put cells in a stressed state. Lipid peroxidation is caused by free radicals stealing electrons from lipid molecules found in the cell membrane. [3] According to Dr. Showkat Ahamd Bhat (2019), acute lead exposure mostly happens in certain work environments and in manufacturing sectors where lead is utilized in production.

Arsenic and its effects

The most important heavy metal, arsenic is semi-metallic and poses a threat to human health as well as the environment. [2] It is recognized that inorganic arsenic is carcinogenic. [9, 10, 3] According to Dr. Showkat Ahmad Bhat (2019), it is the tenth most prevalent element on the planet. The most hazardous and inorganic forms of arsenic are arsenate and arsenite. Arsenic can be found in the air, surface water resources, subterranean water resources, and soil as a result of anthropogenic activities such as industrial processes, the burning of fossil fuels, and the use of chemical fertilizers. [4] Over 140 million people globally drink water tainted with arsenic, above the World Health Organization's 10-part per billion threshold. [4]

Arsenic is a protoplasmic poison that primarily affects the sulphydryl group of cells, causing malfunctions in cell respiration, cell enzymes, and mitosis. [2] Diabetes, renal and hepatic impairment, and neurological issues are brought on by low to moderate exposure. [3] Since arsenicosis is a very specific diagnosis, chronic poisoning is referred to as arsenicosis in most descriptions of arsenicosis in humans. [2] Arsenic poisoning also affects the brain, changing the balance of neurotransmitters and synaptic transmission [3;5]

Compared to neurons with short axons and motor nerves, neurons with long axons and sensory nerves are more impacted resulting in pain, paresthesia, and numbness in the bottoms of the feet [3] Women are more likely than males to be prone to As-induced skin problems [3] such as hyperkeratosis, hyperpigmentation, and various forms of skin cancer. Bowen's disease, Palms and soles affected by hyperkeratosis. Additionally impacts the dorsum of the hands, arms, legs, toes, fingers, and arms. [5]

Low-level arsenic exposure can result in blood vessel damage, irregular heartbeat, prickling sensations in the hands and legs, reduced production of leukocytes and erythrocytes, nausea, and vomiting. [2] Sevtap Tirink (2021) reports that symptoms include extreme perspiration, thirst, muscular weakness, skin color changes, loss of feeling in the hands and feet, coma, and death.

Sevtap Tirink (2021) reports that symptoms include extreme perspiration, thirst, muscular weakness, skin color changes, loss of feeling in the hands and feet, coma, and death. Human reproductive toxicity is recognized to exist in arsenic. By decreasing the weight of the testes, the accessory sex organs, and the quantity of sperm in the epididymis, inorganic arsenic affects male reproduction. It Induces changes in the steroidogenesis process and fluctuations in gonadotropin and testosterone levels. Consumption of arsenic is linked to a higher risk of endometrial cancer in women. [5]

Increases premature delivery, increases fetal loss in women, and loss of conception in the uterus. [3] Several studies conducted by the World Health Organization (WHO) have found that more than 10% of women are at risk of infertility because of their exposure to heavy metals. Arsenic causes epigenetic alterations, damage to DNA, changes in the p53 protein's expression, histone modifications, DNA methylation, and reduced p21 expression. Arsenic poisoning raises the risk of cancer by attaching to DNA-binding proteins and slowing down the DNA-repair process. [5]

The respiratory and digestive systems are the main pathways via which arsenic is absorbed. 95% of the absorbed arsenic is absorbed and between 40% and 60% of the inhaled arsenic is absorbed, [4] causing cellular hypertrophy, chronic bronchitis (inflammation of the respiratory tract), and steatosis (fatty liver). [3]

Deoxyribonucleic acid modification, including chromosomal abnormalities, mutation, micronuclei generation, deletion, and Sister chromatid exchange is a consequence of arsenic's genotoxicity. It has been demonstrated that arsenic does not directly affect DNA. [5] Because arsenic damages platelets, it can lead to cardiovascular disorders. [3] Because of the deadly toxicity of chronic arsenicosis, there is no effective early therapy for arsenic poisoning, which can cause irreversible alterations in the body's important organs and raise the death rate. [2]

Mercury and its effects

After lead and arsenic, mercury (Hg) is the third most hazardous environmental contaminant. [4] In the environment, mercury may be found in three different forms: elemental, inorganic, and organic. [4] Their respective bioavailability and toxicity vary. As of right now, water resources include all three types of mercury. [2] It is a silver-white, lustrous metal that occurs naturally on Earth. When heated, it turns into an odorless, colorless gas. In nature, it is very bio-accumulative and highly poisonous. [2]

In the cement Industry, different measuring and control instruments used as catalysts in the plastics industry, mining, recycling facilities, medical or municipal burning plants, coal-powered electrical plants, or latex dye facilities containing mercury are common sources of mercury exposure. [4]

When ingested or breathed, it is virtually entirely (95–100%) absorbed and becomes at its most dangerous in all organs and tissues, including the brain and placenta. [4]

According to Dr. Showak Ahmad Bhat (2019), exposure to both organic and inorganic mercury might harm a growing fetus's kidneys and brain. The inhalation absorption of inorganic mercury is 10% of the absorbed mercury. However, the skin absorbs between 2% and 3% of inorganic mercury. Either by demethylation to inorganic mercury or to the L-cysteine complex in the gallbladder, organic mercury is released from the body. Urine excretes around 10% of organic mercury. [4]

Elemental mercury vapor primarily affects the central nervous system, which can lead to cognitive, motor, and sensory disturbances as well as symptoms including twitching of the muscles, sleeplessness, memory loss, and tremors in the hands and other areas of the body. Extended exposure to elemental mercury results in impaired focus, clouded eyesight, and shaky gait. High mercury exposure can result in mortality and brain impairment. [3]

Reactive oxygen species (ROS) are produced in large quantities by mercury's peroxidative activity [5] because mercury acts as a catalyst for the Fenton-type reaction [3] which can promote protumorigenic signaling and the formation of malignant cells. By destroying cellular proteins, lipids, and DNA and causing cell damage, ROS can aid in the development of cancer. [5] Mercury is less hazardous than dimethyl mercury. A few milliliters splashed on the skin can be fatal. Because mercury occupies iodine binding sites and prevents the formation of thyroid hormones, it inhibits the action of thyroid hormones and results in hypothyroidism, inflammation of the thyroid, and abnormal body temperature. [3]

Low levels of mercury exposure can lead to depression, tremors (shaking), skin rashes, memory loss, and peeling off of hands and feet as well as redness in youngsters. There is a tendency for the pancreas to accumulate mercury. Hg, which is attached to three sulfur-binding sites in insulin and is linked to diabetes, dysregulates blood glucose levels. Infertility is another effect of hg in both males and females. [3] The World Health Organization and the Environmental Protection Act have established the current standard for drinking water, which is limited to levels of mercury within 0.001-0.002 mg/L because of the significant health impacts associated with mercury exposure. [2]

Human neurotoxicity, nephrotoxicity, and hepatotoxicity have all been linked to mercury exposure. Recent studies have also found cardiovascular harm. Acute cardiac failure, atherosclerosis, and oxidized LDL levels in atherosclerotic lesions have all been related to hair mercury levels. Mercury also inactivates paraoxonase, an extracellular antioxidant enzyme connected to HDL failure. Acute myocardial infarction, coronary heart disease, cardiovascular disease, carotid artery stenosis, and the advancement of atherosclerosis are all closely related to this. [5]

There is a connection between mercury and skin infections. Containing substances, acrodynia, often known as "pink disease,"

A frequent dermatological condition caused by mercury exposure that causes the skin to become pink. The symptoms of moderately severe contact dermatitis resulting from exposure to mercury-containing chemicals include swelling, scaling, vesiculation, and itching. Mercury toxicity is the most common cause of dermatological problems, according to many researches. [5]

Nickel and its effects

According to Sevtap Tirink (2021), nickel (Ni) is a trace element that is frequently found in organisms and is significant for both biology and nutrition. Exposure to nickel can occur through two basic routes. These routes include food and water that have been tainted with substances including nickel. [3]

Human health deteriorates when exposed to nickel. [3] Ni mostly causes lung cancer, chronic bronchitis, and decreased lung function (10). Asthma, sinus issues, and respiratory cancer are brought on by long-term inhalation of carcinogenic forms of nickel, such as nickel oxide. [3]

Controlling many carcinogenic pathways, such as transcription factor regulation, gene regulation, and free radical production, is how nickel acts as a carcinogen. It regulates the expression of certain mRNAs, micro-RNAs, and long non-coding RNAs. It is involved in the down regulation of gene 3 (MEG3) and the methylation of the promoter, both of which enhance the modulation of hypoxia-inducible factor-1 and aid in the development of cancer. [5]

The kidney is the organ most impacted by nickel exposure. Renal damage and Frank hematuria are brought on by acute nickel poisoning. Because Ni increases the lipid (LPO) and accumulates iron, it causes reactive oxygen species (ROS). When iron levels rise, LPO lowers the amount of hepatic glutathione peroxidase, which leads to hydroxyl radicals causing peroxidative damage. [3] Ni ions are necessary for the urease activity of pathogenic bacteria, such as Helicobacter pylori, which causes gastric cancer, to colonize in the stomach's acidic environment. Human exposure to nickel can cause a variety of health problems, including systemic allergy syndrome, hematogenous contact eczema, and nickel allergy. [4]

Chest tightness, perspiration, palpitations, vertigo, sleeplessness, and diarrhea are all brought on by Ni. Individual skin absorption of nickel ions induces dermatitis in skin that is already sensitized.

Dermatitis manifests as skin irritation, skin eruptions, redness, and, in severe cases, ulcers and pustules. [4] Despite having a metallic structure that makes nickel one of the lightest heavy metals, prolonged contact with skin or mucous membranes can occasionally result in allergic reactions and irritation. One typical consequence of skin exposure to nickel is contact dermatitis. [4] Adult respiratory distress syndrome (ARDS) brought on by nickel can occasionally result in death. [3]

Having nickel salts in your stomach can cause nausea, vomiting, and diarrhea. Certain instances of asthma and cannular malfunction may result from long-term inhalation of nickel in its monoxide or metallic form. [4]

Iron and its effects

The second most common metal in the crust of the earth is iron. According to Dr. Showak Ahmad Bhat (2019), iron is a crucial component of some organisms like algae, enzymes like cytochromes and catalase, and oxygen-transporting proteins like myoglobin and hemoglobin.

Iron poisoning happens in four phases.

(i): gastrointestinal symptoms, such as vomiting, diarrhea, and gastrointestinal bleeding, are indicative of iron toxicosis six hours after an iron overdose.

(ii): A time of apparent medical recovery (latent phase) is defined as occurring when iron toxicosis occurs 6–24 hours after an iron intake.

(iii): Iron toxicosis, which occurs between 12 and 96 hours after an iron intake, is characterized by hypotension, tachycardia, shocks, metabolic acidosis, liver necrosis, and occasionally even death. (iv): the development of strictures and gastrointestinal ulcerations within two to six weeks of an iron dosage are indicative of Iron toxicosis. [2]

Iron raises the cancer risk. According to Dr. Showak Ahmad Bhat (2019), workers who are exposed to asbestos have a high chance of acquiring asbestosis, which is the second most common cause of lung cancer. Ferritin produces hydroxyl radicals that can depolymerize polysaccharides, start lipid peroxidation, inactivate certain enzymes, and break DNA strands, which can occasionally cause cell death. [2]

Manganese and its effects

Manganese is a necessary element that the body needs for several physiological processes (2022). Exposure to large amounts of it can cause harmful conditions like neurological complications (Parkinson's disease and Alzheimer's disease) (10), which cause apoptotic cell death and alter homeostasis. [5] The cellular Mn's homeostasis depends on adequate intake, storage, and excretion through several cell receptors and ion channels. In terms of excessive Mn exposure, homeostatic processes down-regulate the receptors linked to metal uptake, while up-regulating those involved in metal discharge from this cell. Ongoing Mn buildup, however, causes more ROS to be produced, which exacerbates mitochondrial dysfunction. Cytochrome c is released when mitochondria malfunction, activating caspase-9, the precursor of apoptosis, which then cleaves caspase-3. Protein kinase C delta, or PKCS, is a pro-apoptotic protein that interacts with the cleaved caspase-3 fragment. DNA fragmentation and apoptosis are both facilitated by the proteolytic cleavage of PKC eta that Caspase-3 induces. [5]

Aluminium and its effects

According to Dr. Showak Ahmad Bhat (2019), aluminium is the third most common element in the crust of the planet and may be found naturally in the air, water, and soil. In the environment, aluminium only occurs in one oxidative state (3+), and people primarily consume it through eating, inhalation, and skin contact. Drinking water, drinks, food, and medications containing aluminium are its exposure sources. [2] According to World Health Organization hypotheses, human exposure to aluminium is likely a risk factor for the onset of Alzheimer disease. Aluminium exposure has been shown to have negative effects on the nervous system, which can lead to memory loss, balance issues, and loss of coordination. [2] Aluminium builds up in the body and damages the brain and bones in renal patients who find it difficult to expel the metal from their bodies. [2] It results in secondary hyperparathyroidism, which can lead to osetomalacia and bone disease, two conditions marked by poor bone remodeling. [2] According to Dr. Showak Ahmad Bhat (2019), patients undergoing renal dialysis may be exposed to aluminium found in tainted dialysates and phosphate binders.

Zinc and its effects

Zinc (Zn) is a crucial component of human nutrition and one of the most critical metals for two bodily metabolic processes. [4] Elevated zinc intake through diet may cause major health problems such poisoning, nausea, vomiting, headaches, severe stomach pain, diarrhea, exhaustion, fever, and damage to the pancreas, protein metabolism, and arteriosclerosis. [4]

Additionally, it irritates the skin of humans. Parkinson’s disease may result from long-term exposure to copper and zinc. [4] These diseases can be treated by using different Novel drug delivery system. [25, 26]

Selenium and its effects

Selenium (Se) is an essential component of the cellular enzyme glutathione peroxidase and a crucial ingredient in several oxidation-reduction reactions. [4]

Because of the strong attachment affinity between selenium and mercury, which maintains the direct engagement of Se and Hg, it is crucial in avoiding mercury poisoning. [4]

Overindulgence in selenium can result in selenosis, which is characterized by fragility, gastrointestinal issues, abnormalities of the neurological system, skin lesions, an aroma similar to garlic breath, and teeth decay. Severe respiratory tract irritations, lung edema, rhinitis, and bronchopneumonia are among the other clinical signs of selenium poisoning. [4]

A CASE REPORT OF MEERUT CITY

METHOD OF STUDY

The review was directed during the period, of Jan’ 2005 to Jan’ 2009 in various areas of Meerut, to figure out the commonness of lung illnesses rate. A little survey was ready and the laborers working in the various divisions of the scissors enterprises were consulted to gather the information. [1]

The geological region of the city was isolated into five zones (East, West, North, South, and Focal) and it was viewed that 78% of the limited-scale scissors enterprises were situated in the focal zone and 22% in the south zone, nonetheless, east, west and north zone are the elegant region of the city. All out 1000 laborers (male: female = 900:100) were evaluated and the data connected with their functioning hours, age bunch, weight, instruction, pay, and religion was gathered. The information gathered from the various divisions of the business was dissected to get to the lung illness rate. [1]

INTERPRETATION OF DATA

The information uncovered that in the Cleaning, Edging, and Polishing divisions of the Business, practically 100 percent of the laborers old enough gathering 20-48 were experiencing lung illnesses. The typical weight, working hours, pay and training of these specialists were (51-58 kg, 14-16 hours, Rs.32000 – 23000, second – fourth norm) individually (Table: 1). In the Plating and Handling segment 7585% laborers of 16-58 years old were experiencing lung illnesses in any case, their typical month to month pay, working hour, weight, and schooling was between 27000-38000, 12-15, 56-58 kg and second norm. The base case (half) of lung sicknesses was analyzed in those laborers who work in the Intensity therapy and Loading division of the business with the least working hours (10-11 hours). [1]

Table 1. Lungs disease among the workers of scissors manufacturing industries

RESULT AND DISCUSSION

Ø  The functioning hour, weight and training played a deciding key job in the review. On a normal, the specialists in every division of the business work for around 10-16 hours.

Ø  The typical load of the specialist didn’t arrive at over 58 kg and their schooling was not more than essential norm.

Ø  The female were found to work just in the Pressing division of the business. In Cleaning, Edging and Polishing division 100 percent of the specialists were experiencing lung sicknesses, 75-85% of the laborers were found in Handling and Plating division and least half were in Intensity therapy and Pressing confronting lung issues.

Ø  It very well might be because of the explanation that the laborers working in the scissors business come in direct contact with the iron shimmers, suspended particles of metal (Si, Fe, Cr, Ni and Metal, and so on), iron and cotton residue, and vapor of acids, lamp oil, Mobil oil. [1]

Ø  More ready to be done was additionally viewed as a large portion of the laborers, around 85%, were smokers or heavy drinkers. The ladies were tracked down just in the pressing division of the business while just 30% of them experienced the ill effects of lung sicknesses. [1]

CONCLUSION

Taking everything into account, metal residue presents huge dangers to human well-being and security, requiring viable anticipation measures and attention to its possible impacts. The inward breath or ingestion of metal residue particles can prompt different unfriendly well-being results, including respiratory issues, lung sicknesses, and foundational poisonousness. Metal residue is produced through different modern cycles like crushing, cutting, and welding, as well as from normal sources like mining and disintegration. It can contain poisonous substances like lead, cadmium, chromium, and nickel, which present specific well-being dangers when they enter the human body. Avoidance of metal residue openness is essential in moderating its hurtful impacts. This includes carrying out designing controls, like ventilation frameworks, to limit dust age and guarantee legitimate regulation. Individual defensive hardware (PPE), including covers, gloves, and defensive apparel, ought to be used to diminish direct contact with metal residue.

Instruction and preparation programs are fundamental for bringing issues to light among laborers and the overall population about the dangers related to metal residue openness. Appropriate cleanliness rehearses, like standard hand washing and staying away from ingestion of tainted food or beverages can likewise assist with limiting openness. Administrative bodies assume an imperative part in lying out and upholding rules and guidelines to shield laborers and networks from metal residue dangers. Managers ought to comply with these guidelines and lead normal checking of air quality to instantly distinguish and address expected gambles.

Taking everything into account, metal residue can have extreme wellbeing consequences for people. By carrying out powerful counteraction methodologies, bringing issues to light, and upholding guidelines, we can limit the dangers related to metal residue openness and guarantee a more secure climate for all.

ACKNOWLEDGEMENT

We express our sincere gratitude to the Sanskar Educational Group Management for their continuous support, encouragement, and resources that facilitated the successful completion of this article, Toxic Legacy: A Review of Disease Caused by Heavy Metals and Dust Their guidance and institutional backing played a vital role in our research and writing process.

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