Activity of Long-Chain Acyl-CoA Synthetase Is Required for Maintaining Meiotic Arrest in Xenopus laevis1

生物 爪蟾 细胞生物学 减数分裂 遗传学 基因
作者
Huawei Wang,Fang Jun,Xingya Kuang,Li-yun Miao,Chao Wang,Guo-liang Xia,Mary Lou King,Jian Zhang
出处
期刊:Biology of Reproduction [Oxford University Press]
卷期号:87 (3) 被引量:22
标识
DOI:10.1095/biolreprod.112.100511
摘要

In most vertebrates, fully grown oocytes are arrested in meiotic prophase I and only resume the cell cycle upon external stimuli, such as hormones. The proper arrest and resumption of the meiotic cycle is critical for reproduction. A Galpha(S) signaling pathway essential for the arrest is conserved in organisms from Xenopus to mouse and human. A previous gene association study implicated that mutations of human ACSL6 may be related to premature ovarian failure. However, functional roles of ACSL6 in human infertility have yet to be reported. In the present study, we found that triacsin C, a potent and specific inhibitor for ACSL, triggers maturation in Xenopus and mouse oocytes in the absence of hormone, suggesting ACSL activity is required for the oocyte arrest. In Xenopus, acsl1b may fulfill a major role in the process, because inhibition of acsl1b by knocking down its RNA results in abnormal acceleration of oocyte maturation. Such abnormally matured eggs cannot support early embryonic development. Moreover, direct inhibition of protein palmitoylation, which lies downstream of ACSLs, also causes oocyte maturation. Furthermore, palmitoylation of Galpha(s), which is essential for its function, is inhibited when the ACSL activity is blocked by triacsin C in Xenopus. Thus, disruption of ACSL activity causes inhibition of the Galpha(s) signaling pathway in the oocytes, which may result in premature ovarian failure in human.
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