TAp73 is essential for germ cell adhesion and maturation in testis.

TAp73 is essential for germ cell adhesion and maturation in testis.
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DOI:
10.1083/jcb.201306066
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发表时间:
2014-03-31
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Moll UM
Moll UM
中科院分区:
其他
文献类型:
--
作者:
Holembowski L;Kramer D;Riedel D;Sordella R;Nemajerova A;Dobbelstein M;Moll UM

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p53家族成员TAp 73通过促进发育中的生殖细胞和Sertoli滋养细胞之间的粘附而为精子成熟所需。p53家族的核心进化功能是保护配子的基因组完整性。然而,p73在男性生殖系中的作用尚不清楚。在这里,我们发现,TAp 73出乎意料的功能作为一个粘附和成熟的生精上皮的因素编排精子发生。TAp 73敲除(TAp 73 KO)和p73 KO小鼠(但不是Δ Np 73 KO小鼠)由于大量未成熟生殖细胞的过早丢失而显示出“近空曲细精管”表型。这种表型的细胞基础是发育中的生殖细胞与支持细胞的细胞-细胞粘附缺陷,支持细胞可能发生继发性变性,包括血-睾丸屏障,导致生殖上皮的粘附完整性和成熟破坏。在分子水平上,TAp 73,这是在生殖细胞中产生的,控制一个协调的转录程序的粘附和迁移相关的蛋白质,包括肽酶抑制剂,蛋白酶,受体和整合素所需的生殖支持细胞粘附和动态连接重建。因此,我们认为睾丸是一个独特的器官,在所有家庭成员中有严格的分工:p63和p53保护生殖系的保真度,而TAp 73通过使精子成熟来确保生育力。
The p53 family member TAp73 is required for sperm maturation through promotion of adhesion between developing germ cells and Sertoli nurse cells. A core evolutionary function of the p53 family is to protect the genomic integrity of gametes. However, the role of p73 in the male germ line is unknown. Here, we reveal that TAp73 unexpectedly functions as an adhesion and maturation factor of the seminiferous epithelium orchestrating spermiogenesis. TAp73 knockout (TAp73KO) and p73KO mice, but not ΔNp73KO mice, display a “near-empty seminiferous tubule” phenotype due to massive premature loss of immature germ cells. The cellular basis of this phenotype is defective cell–cell adhesions of developing germ cells to Sertoli nurse cells, with likely secondary degeneration of Sertoli cells, including the blood–testis barrier, which leads to disruption of the adhesive integrity and maturation of the germ epithelium. At the molecular level, TAp73, which is produced in germ cells, controls a coordinated transcriptional program of adhesion- and migration-related proteins including peptidase inhibitors, proteases, receptors, and integrins required for germ–Sertoli cell adhesion and dynamic junctional restructuring. Thus, we propose the testis as a unique organ with strict division of labor among all family members: p63 and p53 safeguard germ line fidelity, whereas TAp73 ensures fertility by enabling sperm maturation.
p53 和遗传背景对小鼠产前卵子生成和卵母细胞损耗的影响
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