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LINE-1 hypomethylation in spermatozoa is associated with Bisphenol A exposure.

Authors
Miao-M; Zhou-X; Li-Y; Zhang-O; Zhou-Z; Li-T; Yuan-W; Li-R; Li-D-K
Source
Andrology 2014 Jan; 2(1):138-144
NIOSHTIC No.
20045036
Abstract
Bisphenol A (BPA) is an endocrine disruptor with potentially harmful effects on humans. However, epigenetic mechanisms that modulate the effects of BPA remain unclear. Methylation of long interspersed nucleotide elements (LINE-1) is a marker of genomewide methylation status. This study aims to examine whether BPA exposure was associated with LINE-1 methylation changes in men. Male factory workers in Hunan, China (N = 149) were studied, 77 with BPA exposure in workplace (BPA-exposed group) and 72 without BPA exposure in workplace (control group). Pre-shift and post-shift urine samples were collected from the BPA-exposed group and spot urine samples were collected from the control group. Urine samples were assessed for BPA. In addition, blood and semen samples were collected from both groups for LINE-1 methylation analysis. In multivariate analysis adjusted for age, education, smoking habits and alcohol consumption, sperm LINE-1 methylation level was significantly lower in BPA exposed workers (p < 0.001) compared to that in the unexposed workers. Linear regression analysis also showed that log-transformed urine BPA levels were inversely associated with sperm LINE-1 methylation (p < 0.0001), but not peripheral blood cell LINE-1 methylation. Moreover, the association between urine BPA level and semen quality was not attenuated after adjustments for LINE-1 level. In summary, the observed independent relationship between BPA exposure and LINE-1 methylation may have public health implications on reproductive health in men because of ubiquitous exposure to BPA.
Keywords
Endocrine-system-disorders; Endocrine-function; Endocrine-system; Exposure-levels; Risk-factors; Hazards; Humans; Men; Urinalysis; Reproductive-hazards; Reproductive-effects; Reproduction; Public-health; Spermatozoa; Author Keywords: Bisphenol A; endocrine disruptor; LINE-1; methylation; spermatozoa
Contact
Runsheng Li and Wei Yuan, Key Laboratory of Contraceptive Drugs and Devices of NPFPC, Shanghai Institute of Planned Parenthood Research, Shanghai 200032, China
CODEN
ANDRCP
CAS No.
80-05-7
Publication Date
20140101
Document Type
Journal Article
Email Address
runshengli2007@gmail.com
Funding Type
Grant
Fiscal Year
2014
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-007580; M092014
Issue of Publication
1
ISSN
2047-2919
Source Name
Andrology
State
CA
Performing Organization
Kaiser Foundation Research Institute
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