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2015 ; 123
(12
): 1287-93
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In Vitro Effects of Bisphenol A ?-D-Glucuronide (BPA-G) on Adipogenesis in Human
and Murine Preadipocytes
#MMPMID26018136
Boucher JG
; Boudreau A
; Ahmed S
; Atlas E
Environ Health Perspect
2015[Dec]; 123
(12
): 1287-93
PMID26018136
show ga
BACKGROUND: Exposure to common environmental substances, such as bisphenol A
(BPA), has been associated with a number of negative health outcomes. In vivo,
BPA is rapidly converted to its predominant metabolite, BPA-glucuronide (BPA-G),
which has long been believed to be biologically inactive because it lacks
estrogenic activity. However, the effects of BPA-G on cellular metabolism have
not been characterized. In the present study we examined the effect of BPA-G on
adipogenesis. METHODS: The effect of BPA-G on the differentiation of human and
3T3L1 murine preadipocytes was evaluated in vitro by quantifying lipid
accumulation and the expression of adipogenic markers. RESULTS: Treatment of
3T3L1 preadipocytes with 10 ?M BPA-G induced a significant increase in lipid
accumulation, mRNA expression of the adipogenic markers sterol regulatory element
binding factor 1 (SREBF1) and lipoprotein lipase (LPL), and protein levels of
LPL, aP2, and adipsin. Treatment of primary human preadipocytes with BPA-G also
induced adipogenesis as determined by aP2 levels. Co-treatment of cells with the
estrogen receptor (ER) antagonist fulvestrant (ICI) significantly inhibited the
BPA-G-induced increase in LPL and aP2 levels, whereas treatment with ICI alone
had no effect. Moreover, BPA-G did not display any significant estrogenic
activity. CONCLUSIONS: To our knowledge, this study is the first to report that
BPA-G induces adipocyte differentiation and is not simply an inactive metabolite.
The fact that BPA-G induced adipogenesis and was inhibited by an ER antagonist
yet showed no estrogenic activity suggests that it has no classical ER
transcriptional activation function and acts through a pathway that remains to be
determined.