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Implications of caveolae in testicular and epididymal myoid cells to sperm motility
Author(s) -
Oliveira Regiana L.,
Parent Adam,
Cyr Daniel G.,
Gregory Mary,
Mandato Craig A.,
Smith Charles E.,
Hermo Louis
Publication year - 2016
Publication title -
molecular reproduction and development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.745
H-Index - 105
eISSN - 1098-2795
pISSN - 1040-452X
DOI - 10.1002/mrd.22649
Subject(s) - biology , epididymis , caveolae , sperm , microbiology and biotechnology , motility , sertoli cell , sperm motility , paracrine signalling , epithelium , vas deferens , andrology , spermatogenesis , anatomy , endocrinology , signal transduction , receptor , genetics , medicine
SUMMARY Seminiferous tubules of the testis and epididymal tubules in adult rodents are enveloped by contractile myoid cells, which move sperm and fluids along the male reproductive tract. Myoid cells in the testis influence Sertoli cells by paracrine signaling, but their role in the epididymis is unknown. Electron microscopy revealed that elongated myoid cells formed several concentric layers arranged in a loose configuration. The edges of some myoid cells in a given layer closely approximated one another, and extended small foot‐like processes to cells of overlying layers. Gap junction proteins, connexins 32 and 43, were detected within the myoid cell layers by immunohistochemistry. These myoid cells also had caveolae that contained caveolin‐1 and cavin‐1 (also known as PTRF). The number of caveolae per unit area of plasma membrane was significantly reduced in caveolin‐1‐deficient mice ( Cav1 −/− ). Morphometric analyses of Cav1 ‐null testes revealed an enlargement in whole‐tubule and epithelial profile areas, whereas these parameters were slightly reduced in the epididymis. Although sperm are non‐motile as they pass through the proximal epididymis, statistical analyses of cauda epididymidis sperm concentrations revealed no significant differences between wild‐type and Cav1 −/− mice. Motility analyses, however, indicated that sperm velocity parameters were reduced while beat cross frequency was higher in gametes of Cav1 −/− mice. Thus while caveolae and their associated proteins are not necessary for myoid cell contractility, they appear to be crucial for signaling with the epididymal epithelium to regulate the proper acquisition of sperm motility. Mol. Reprod. Dev. 83: 526–540, 2016. © 2016 Wiley Periodicals, Inc .