Kiera Jefferson
Environmental pollutants are a major cause of bone loss. These pollutants include heavy metals such as lead and cadmium, endocrine-disrupting chemicals (EDCs) such as phthalates and bisphenols, and ambient air pollutants such as particulate matter (PM), nitrogen dioxide (NO2), and nitrogen oxide (NOx). Research has shown that exposure to these pollutants can lead to reduced bone mineral density (BMD) and an increased risk of osteoporosis and bone fractures. While the impact of these pollutants on bone health is well-established, there is still much to be understood about the mechanisms by which they disrupt bone metabolism and healing.
| Characteristics | Values |
|---|---|
| Environmental toxins | Metals, pesticides, prescribed and OTC drugs, and molecules such as salt and phosphate additives |
| Metals | Cadmium, lead, Mg, Fe, Cu, Zn, Mn, Co |
| Endocrine-disrupting chemicals (EDCs) | Bisphenols, phthalates, parabens, organotins, dioxins, polychlorinated biphenyls, poly- and perfluoroalkyl |
| Air pollutants | Particulate matter (PM), nitrogen dioxide (NO2), nitrogen oxide (NOx) |
| Pesticides | Phenols, pesticides, phthalates, polycyclic aromatic hydrocarbon metabolites |
| Hazardous chemicals | Chlorobenzene, m-Xylene, styrene, aliphatic compounds |
| Dioxins | Benzo [a]pyrene, polychlorinated dibenzofurans, non-ortho-substituted, mono-ortho-substituted pentachlorobiphenyls |
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What You'll Learn
Endocrine-disrupting chemicals (EDCs)
EDCs can enter the body through various routes, including air, diet, skin, and water. They are present in the environment (air, soil, or water supply), food sources, personal care products, and manufactured products. People may be exposed to EDCs through the food and beverages they consume, the pesticides applied to produce, and the cosmetics they use. For example, processed foods can accumulate traces of EDCs that leach out of materials used in manufacturing, processing, transportation, and storage. Even low doses of EDCs may be unsafe and can lead to health problems.
EDCs can act as ""hormone mimics", tricking the body into thinking they are natural hormones. They can also block natural hormones from doing their job, increase or decrease hormone levels in the blood, or change how sensitive the body is to different hormones. These disruptions can have significant developmental and biological effects, especially during fetal development and childhood, where hormones regulate the formation and maturation of organs. High exposures during these critical periods can have long-lasting health effects and increase the risk for various diseases later in life.
Some common sources of EDCs include industrial chemicals, pesticides, household chemicals, cosmetics, lotions, fragrances, anti-bacterial soaps, and processed foods. EDCs have been linked to numerous adverse health outcomes, including alterations in sperm quality and fertility, abnormalities in sex organs, endometriosis, early puberty, altered nervous system function, immune function, certain cancers, respiratory problems, metabolic issues, diabetes, obesity, and cardiovascular problems.
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Particulate matter air pollution
Particulate matter (PM) is a complex mixture of particles suspended in the air. It is a major contributor to the adverse effects of pollution on health. PM can penetrate the lower respiratory tract and has harmful direct and indirect effects on different organs and tissues.
Direct effects are caused by the ability of PM components to cross the respiratory membrane and enter the bloodstream. Indirect effects are systemic consequences of the local airway response. PM is an independent risk factor for low bone mineral density and osteoporosis-related fractures. Osteoporosis is a common age-related disease closely linked to bone fractures, with severe clinical consequences affecting quality of life, morbidity, and mortality.
Recent studies have shown that PM2.5 enters the circulation and then travels to distant organs, including the bone marrow, to induce oxidative stress, systemic inflammation, and epigenetic changes, resulting in the reduction of bone marrow-residing stem cell survival and function. Prolonged exposure to PM2.5 can disturb the bone marrow environment, causing oxidative stress (damage caused by free radicals) and inflammation in HSCs. This can result in irregular blood development and a weakened immune system.
The harmful effects of PM on bone health are comparable to those of smoking. Tobacco smoke, which includes several chemo-physical components found in PM, causes bone mineral loss in animal experiments and has been associated with a higher risk of bone fractures and increased bone mineral loss in human studies.
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Tobacco smoke
The impact of tobacco smoke on bone health is through both direct and indirect mechanisms. Indirectly, it affects bone mass by altering body weight, the parathyroid hormone-vitamin D axis, adrenal hormones, sex hormones, and increasing oxidative stress on bony tissues. The nicotine in cigarettes also slows down the production of bone-forming cells (osteoblasts), reducing bone formation. Additionally, smoking decreases calcium absorption, which is necessary for bone mineralization, further contributing to fragile bones (osteoporosis).
Directly, tobacco smoke impacts osteogenesis and angiogenesis of bone. It also influences the RANKL-RANK-OPG pathway, an essential regulatory pathway for bone metabolism. The impact of smoking on bone health is more pronounced in older individuals, with postmenopausal women and elderly men being at a higher risk for osteoporosis and fractures.
Quitting smoking is crucial for improving overall health, including bone and musculoskeletal health. It is essential to seek medical advice and support when attempting to stop smoking, as it can be challenging to do so due to the addictive nature of tobacco products.
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Heavy metals
The impact of heavy metals on bone health depends on various factors, including the type and concentration of the metal, the duration of exposure, and internal factors such as absorption, metabolism, genetic disposition, age, and gender. For example, zinc, copper, and nickel can have anabolic effects on bone tissue at low concentrations, but both their lack and excess can damage bone integrity. On the other hand, metals like cadmium, arsenic, mercury, chromium, and aluminum are toxic to bone cells even at low concentrations.
Age also plays a role in the concentration of heavy metals in bones. Studies have shown that with increasing age, the concentration of cadmium in bone increases, while the concentrations of chromium, cobalt, and thallium decrease. These changes are likely related to the equilibrium of bone metabolism in older individuals. Additionally, cobalt has been linked to osteopenia.
The research on heavy metals and bone health is ongoing, and it is a focus of many studies due to the health hazards these pollutants pose. Understanding the impact of heavy metals on bone metabolism and bone diseases is crucial for developing strategies to protect bone health and overall human health.
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Pesticides
Additionally, OCPs impair lipid (cholesterol) and protein metabolism, causing further liver, kidney, and thyroid dysfunction, and increasing chronic low-grade inflammation. This inflammation contributes to bone loss. Research has also found that as urinary levels of pesticides increase, bone mineral density (BMD) decreases, and osteoporosis risk increases, particularly in women.
The impact of pesticides on bone health is significant enough that medical experts recommend reducing exposure to these chemicals as part of a patient's bone health treatment plan. Strategies to reduce exposure include choosing organic versions of high-pesticide produce, avoiding direct exposure to pesticides, and using HEPA air purifiers.
It is important to note that while pesticides can have detrimental effects on bone health, there are also critical nutrients required for bone health that may be challenging to obtain from organic sources alone. Therefore, a balanced approach is necessary to ensure optimal bone health.
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Frequently asked questions
Bone pollutants are environmental toxicants that negatively impact bone health and function, increasing the risk of fracture and osteoporosis.
Some examples of bone pollutants include endocrine-disrupting chemicals (EDCs), heavy metals such as lead and cadmium, and ambient air pollutants like particulate matter (PM), nitrogen dioxide (NO2), and nitrogen oxide (NOx).
Bone pollutants can disrupt bone metabolism and bone remodelling processes, leading to decreased bone mineral density and an increased risk of osteoporosis and osteopenia.
Reducing exposure to bone pollutants can be achieved through various strategies, such as avoiding direct and indirect contact with cigarette smoke, using HEPA air purifiers, choosing organic produce, and being mindful of potential chronic exposures in daily life.
