TRPV3 channels mediate strontium-induced mouse-egg activation.

TRPV3 channels mediate strontium-induced mouse-egg activation.
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DOI:
10.1016/j.celrep.2013.11.007
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发表时间:
2013-12-12
期刊:
影响因子:
8.8
通讯作者:
Clapham DE
Clapham DE
中科院分区:
生物学1区
文献类型:
--
作者:
Carvacho I;Lee HC;Fissore RA;Clapham DE

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在哺乳动物中,卵母细胞成熟和卵子激活需要钙内流。钙渗透通道的分子身份,胚胎发育的启动基础尚未建立。在这里,我们描述了一个瞬时受体电位(TRP)离子通道电流激活的TRP激动剂,是不存在的TrpV 3 −/−鸡蛋。TRPV 3电流在卵母细胞成熟过程中差异表达,在减数分裂中期II(MII)(受精阶段)达到最大密度和活性的峰值。TRPV 3通道的选择性激活通过介导大量钙离子进入引起卵激活。广泛用于激活卵子,已知锶应用与体细胞核移植结合产生正常后代。我们发现TRPV 3是锶流入所必需的,因为TrpV 3 −/−卵不能渗透Sr 2+或经历锶诱导的激活。我们认为TRPV 3是小鼠卵中钙内流的主要介质,并且是人工卵激活的假定靶点。
In mammals, calcium influx is required for oocyte maturation and egg activation. The molecular identities of the calcium-permeant channels that underlie the initiation of embryonic development are not established. Here, we describe a Transient Receptor Potential (TRP) ion channel current activated by TRP agonists that is absent in TrpV3−/− eggs. TRPV3 current is differentially expressed during oocyte maturation, reaching a peak of maximum density and activity at metaphase of meiosis II (MII), the stage of fertilization. Selective activation of TRPV3 channels provokes egg activation by mediating massive calcium entry. Widely used to activate eggs, strontium application is known to yield normal offspring in combination with somatic cell nuclear transfer. We show that TRPV3 is required for strontium influx, as TrpV3−/− eggs failed to permeate Sr2+ or undergo strontium-induced activation. We propose that TRPV3 is the major mediator of calcium influx in mouse eggs and is a putative target for artificial egg activation.
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