Carbaryl inhibits basal and FSH-induced progesterone biosynthesis of primary human granulosa-lutein cells.
Carbaryl is known to impede female reproductive function, however, the mechanisms through which the adverse effects are mediated are not clearly elucidated. In order to get insight into the mechanisms, this study was conducted to raise fresh concerns about the potential effects of carbaryl on steroidogenesis by primary human granulosa-lutein cells (hGLCs) and explore the possible nature of this action. hGLCs were co-incubated with various concentrations of carbaryl at 0, 1, 5, 25, 125 micromol/L for 24 h to examine effects of this carbamate pesticide on progesterone accumulation. We observed that the carbaryl inhibited basal and FSH-induced progesterone production in a dose-dependent manner. We also investigated the effects of carbaryl on 22(R)-hydroxycholesterol (22R-HC)-stimulated progesterone yield, basal and FSH-stimulated StAR gene expression and cyclic adenosine monophosphate (cAMP) production, as well as forskolin (non-specific activator of adenylyl cyclase)-induced progesterone and cAMP production of hGLCs. We found that the decreased progesterone biosynthesis was accompanied with a reduced cAMP abundance on both basal and FSH-induced condition. Furthermore, our results demonstrated that the 22R-HC could remove the carbaryl-induced restraint of progesterone biosynthesis, suggesting that carbaryl caused a disruption of cholesterol transport across mitochondrial membranes, which was further confirmed by the observation that carbaryl inhibited the gene expression of steroidogenic acute regulatory protein (StAR). In addition, the inhibitory effects of carbaryl on progesterone and cAMP production were completely reversed by addition of forskolin to the cell culture, which indicated a repaired site on the upstream components of adenylate cyclase or adenylate cyclase per se by carbaryl in the cAMP-mediated signal pathway. All the effects mentioned above were not due to a detrimental action of carbaryl on cell viability by MTS assay. In conclusion, carbaryl may inhibit steroidogenesis, at least in part, by obstructing the delivery of cholesterol over mitochondrial membranes and attenuating cAMP generation.
Cheng
Senping
S
Key Laboratory of Reproductive Medicine of Jiangsu Province, Institute of Toxicology, Nanjing Medical University, Nanjing 210029, PR China.
Chen
Jianfeng
J
Qiu
Yang
Y
Hong
Xia
X
Xia
Yankai
Y
Feng
Ting
T
Liu
Jiayin
J
Song
Lin
L
Zhang
Zhengdong
Z
Wang
Xinru
X
D012721:Carbaryl / Q000633:toxicity*; D002478:Cells, Cultured; D005576:Colforsin / Q000494:pharmacology; D000242:Cyclic AMP / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004338:Drug Combinations; D005260:Female; D005640:Follicle Stimulating Hormone / Q000494:pharmacology*; D015870:Gene Expression / Q000187:drug effects; D006107:Granulosa Cells / Q000187:drug effects* / Q000378:metabolism; D006801:Humans; D006888:Hydroxycholesterols / Q000494:pharmacology; D010575:Pesticides / Q000633:toxicity*; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism; D011374:Progesterone / Q000096:biosynthesis*; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D000098682:Steroidogenic Acute Regulatory Protein
D004338:Drug Combinations; D006888:Hydroxycholesterols; D010575:Pesticides; D010750:Phosphoproteins; D012333:RNA, Messenger; D000098682:Steroidogenic Acute Regulatory Protein; C003585:22-hydroxycholesterol; D005576:Colforsin; D011374:Progesterone; D005640:Follicle Stimulating Hormone; D000242:Cyclic AMP; D012721:Carbaryl