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Babić Leko, M.; Pleić, N.; Gunjača, I.; Zemunik, T. Environmental Factors Affect Parathyroid Hormone and Calcitonin. Encyclopedia. Available online: https://encyclopedia.pub/entry/19322 (accessed on 19 May 2024).
Babić Leko M, Pleić N, Gunjača I, Zemunik T. Environmental Factors Affect Parathyroid Hormone and Calcitonin. Encyclopedia. Available at: https://encyclopedia.pub/entry/19322. Accessed May 19, 2024.
Babić Leko, Mirjana, Nikolina Pleić, Ivana Gunjača, Tatijana Zemunik. "Environmental Factors Affect Parathyroid Hormone and Calcitonin" Encyclopedia, https://encyclopedia.pub/entry/19322 (accessed May 19, 2024).
Babić Leko, M., Pleić, N., Gunjača, I., & Zemunik, T. (2022, February 10). Environmental Factors Affect Parathyroid Hormone and Calcitonin. In Encyclopedia. https://encyclopedia.pub/entry/19322
Babić Leko, Mirjana, et al. "Environmental Factors Affect Parathyroid Hormone and Calcitonin." Encyclopedia. Web. 10 February, 2022.
Environmental Factors Affect Parathyroid Hormone and Calcitonin
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This entry is adapted from the peer-reviewed paper 10.3390/ijms23010044

Calciotropic hormones, parathyroid hormone (PTH) and calcitonin are involved in the regulation of bone mineral metabolism and maintenance of calcium and phosphate homeostasis in the body. Therefore, an understanding of environmental and genetic factors influencing PTH and calcitonin levels is crucial. Genetic factors are estimated to account for 60% of variations in PTH levels.

environmental factors PTH calcitonin lifestyle

1. Introduction

Maintenance of calcium homeostasis in the body is crucial since calcium regulates various physiological processes, including cellular signaling, protein and enzyme function, neurotransmission, contractility of the muscles, and blood coagulation [1]. Calcium homeostasis is regulated by parathyroid hormone (PTH), calcitonin, the active form of vitamin D (1α,25-dihydroxyvitamin D (1,25(OH)2D3)), and serum calcium and phosphate levels. Regulation of phosphate metabolism is also important as phosphate is involved in protein and enzyme function, cell signaling, and skeletal mineralization and is a component of cell membranes and nucleic acids [2][3]. The main factors that regulate phosphate homeostasis are PTH, fibroblast growth factor 23 (FGF-23), 1,25(OH)2D3, and Klotho [3]. Calcitonin is also involved in the regulation of phosphate levels [4][5]. PTH is released from the parathyroid glands [6], while calcitonin is released from thyroid C-cells [7]. Alternation of PTH levels can lead to the development of hyperparathyroidism and hypoparathyroidism. Changes in calcitonin levels have also been observed in pathological conditions (such as medullary thyroid carcinoma [8]). Therefore, variations in PTH and calcitonin levels may indicate that the normal functioning of parathyroid glands and thyroid is altered. Various factors can affect PTH and calcitonin levels, such as genetic factors [9][10][11], demographic factors (age [12][13][14], sex [15][16][17]), and environmental factors [18][19][20][21]. It is estimated that genetic factors account for 60% of variations in PTH levels [9], while the amount to which genetic factors contribute to interindividual variation in calcitonin levels has not been studied (Figure 1).

/media/item_content/202209/632bdfbc87e58ijms-23-00044-g001.png
Figure 1. Environmental factors (lifestyle factors and pollutants) that affect PTH and calcitonin levels. As, arsenic; BMI, body mass index; Ca, calcium; Cd, cadmium; F, fluoride; Mg, magnesium; Pb, lead; PCB, polychlorinated biphenyl; PFAS, perfluoroalkyl substances; PTH, parathyroid hormone; Zn, zinc.

2. Environmental Factors That Affect PTH and Calcitonin Levels

2.1. Lifestyle Factors

2.1.1. Smoking

A lot of studies have investigated the impact of smoking on PTH levels. Most of them reported a decrease in PTH levels in smokers [22][23][24]. Studies investigating the effect of smoking on calcitonin levels have found an increase in calcitonin levels in smokers [17][25][26].

2.1.2. Body Mass Index

Many studies have investigated the influence of body mass index (BMI) on PTH levels. Most of them have shown that an increase in BMI is accompanied by an increase in PTH levels [22][23][27]. However, a study by Yuan et al., showed a positive correlation between BMI and PTH levels in subjects with lower PTH levels (below 65.8 pg/mL), while a negative correlation was observed between BMI and PTH levels in the group of patients with high PTH levels (above 147 pg/mL) [28]. Several studies have investigated the association between BMI and calcitonin levels, reporting conflicting results [17][25].

2.1.3. Diet

Different types of food can affect the level of PTH in the body. A diet high in phosphorus and low in calcium has been shown to increase PTH levels [29][30]. This is logical because both high serum phosphate levels and low serum calcium levels are signals to increase PTH release [31]. Because vitamin D and PTH act together, several studies have tested the effect of vitamin D on PTH levels. About 95% of vitamin D is synthesized in the skin after exposure to sunlight, while 5% of vitamin D comes from food [32]. Since PTH and the active form of vitamin D (1,25(OH)2D) are in an inverse relationship, it is not surprising that most of the studies have reported a decrease in PTH levels after vitamin D intake [33][34][35]. No changes in calcitonin levels were observed after vitamin D intake [36]. Calcium intake has been shown to decrease PTH levels [27][37], which is to be expected since PTH is released in hypocalcemia.

2.1.4. Alcohol

Studies investigating the influence of alcohol on PTH levels have yielded conflicting results. Some studies have found a decrease in PTH levels in alcoholics, while most studies have not reported a significant change in PTH levels due to alcohol consumption [24][38]. Conflicting results were published regarding calcitonin levels in alcoholics, with calcitonin levels being increased, decreased, or unchanged in alcoholics [39][40][41].

2.1.5. Exercise

Studies that have investigated the influence of exercise on PTH levels have reported an increase in PTH levels during and after exercise [20][42][43]. Calcitonin levels increased [44] or did not change [20] during exercise.

2.2. Pollutants

2.2.1. Heavy Metals

Various heavy metals, such as cadmium (Cd), arsenic (As), and lead (Pb), affect PTH levels. It has been shown that PTH levels decrease after cadmium exposure [18][45]. Arsenic exposure did not affect PTH levels [46]. Otherwise, an increase in PTH levels was observed in subjects exposed to lead [47][48].

2.2.2. Chemicals

Only a few studies have investigated the effect of chemicals on PTH levels in humans. Exposure to persistent organochlorine compounds (p,p′-diphenyldichloroethene (p,p′-DDE) and polychlorinated biphenyls (PCBs)) did not affect PTH levels [49][50]. Exposure to perfluoroalkyl substances (PFAS) led to an increase in PTH levels [51]. Di Nisio et al. suggested that perfluoro-octanoic acid (PFOA) binds to vitamin D receptors, causing reduced 1,25(OH)D activity, which in turn increases PTH levels [51]. Fluoride exposure increases PTH levels [52]. According to researchers, excess fluoride alters calcium metabolism and potentially leads to secondary hyperparathyroidism (reviewed in [53]). Exposure to perchlorate, thiocyanate, and nitrate has led to a decrease in PTH levels, but the underlying mechanism of this action is not yet clear [19].

3. Conclusions

Environmental factors affect the levels of PTH and calcitonin, two hormones that regulate calcium and phosphate homeostasis. In terms of lifestyle factors, most studies have shown a decrease in PTH levels in smokers, a positive correlation between BMI and PTH, an increase in PTH levels during exercise, and a decrease in PTH levels after vitamin D and calcium intake. The results of studies on the impact of alcohol consumption and intake of different types of food and micronutrients (except for vitamin D and calcium) showed great variability. Regarding studies that analyzed the effect of pollutants on PTH levels, the clearest relationship was between PTH and cadmium, with PTH levels decreasing after cadmium exposure. While arsenic exposure did not affect PTH levels, lead exposure resulted in increased PTH levels. Several studies have investigated the influence of chemicals on PTH levels in humans. Moreover, data on the effect of chemicals and heavy metals on calcitonin levels in humans are scarce, and most of the knowledge, to date, relies on studies in experimental animals. As for the relationship between lifestyle factors and calcitonin, several studies have been conducted on humans and have given great variability in results. The most consistent results were related to smoking (an increase in calcitonin levels was observed in smokers). Given the important role that PTH and calcitonin play in maintaining calcium and phosphate homeostasis in the body, additional studies on the influence of environmental and genetic factors that could affect the levels of these two hormones are extremely important.

Abbreviations

1,25(OH)2D3, 1α,25-dihydroxyvitamin D; 25(OH)D, 25-hydroxyvitamin D; As, arsenic; BMD, bone mineral density; BMI, body mass index; Ca, calcium; Cd, cadmium; F, fluoride; FGF-23, fibroblast growth factor 23; iPTH, intact parathyroid hormone; Mg, magnesium; Pb, lead; PCB, polychlorinated biphenyl; PFAS, perfluoroalkyl substances; PFOA, perfluoro-octanoic acid; p,p-DDE, p,p-diphenyldichloroethene; PTH, parathyroid hormone; Zn, zinc.

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Mirjana Babić Leko
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Tatijana Zemunik
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