Title: Effects of low level manganese exposure on the serum neuroendocrine hormones in the welders
Abstract: Objective To study the effects of low level manganese (Mn)exposure on the serum neuroendocrine hormones levels of the welders. Methods The exposure group consisted of 41 male welders,40 male workers without exposing to harmful agents served as controls. The serum contents of prolactin(PRL),luteinizing hormone (LH), follicle stimulating hormone (FSH), testosterone (TST) and thyroid stimulating hormone (TSH) of 81 subjects were detected by chemiluminescence immunoassay. Results The geometric mean value of airborne Mn concentrations was 0.03 mg/m3 (0.003-0.519 mg/m3) in the welding circumstances.The levels of Mn in red blood cells(RBCs) and urinary Mn of the exposure group were significantly higher than those of control group ( P<0.01 ). The contents of serum LH and TSH of the exposure group were 2.89±0.69mIU/ml and 1.45±0.56 uIU/ml, which were significantly lower than those (3.82±1.61 mIU/ml and 2.19±1.28μIU/ml ) of control group(P<0.01 ). The serum contents of LH, FSH and TSH of the group exposed to Mn for <5years were significantly lower than those of the control group, The serum TST level of the group exposed to Mn for <5 years was significantly higher than those of the control group and group exposed to Mn for 5~years, the serum FSH level of the group exposed to Mn for < 5 years was significantly lower than that of the group exposed to Mn for 10 years (P<0.05 or P<0.01 ). The serum contents of LH and TSH of the group exposed to Mn for 5~years were significantly lower than those of the control group (P<0.05 or P<0.01 ). The serum contents of PRL, LH and TSH of the group exposed to Mn for 10 years were significantly lower than those of the control group(P<0.05 ). There was negative correlation between blood( RBC ) Mn and urinary Mn(r=-0.310, P<0.05 ),also there was negative correlation between serum PRL and serum TST (r=-0.409, P<0.01 ), the positive correlation between serum LH and serum FSH was observed (r=0.361, P<0.05 ). Conclusion The results of present study showed that the long exposure to low level of Mn may decrease the levels of serum PRL, LH and TSH in workers occupationally exposed to Mn, which can influence the metabolism of neuroendocrine hormones to certain extent.
Key words:
Manganese; Manganese poisoning; Welding; Serum; Neurosecretory systems; Hormones
Publication Year: 2011
Publication Date: 2011-02-01
Language: en
Type: article
Indexed In: ['pubmed']
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Cited By Count: 4
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