Dynamic cross-talk between cells and the extracellular matrix in the testis

BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology
Michelle K Y Siu, C Yan Cheng

Abstract

In the seminiferous tubule of the mammalian testis, one type A1 spermatogonium (diploid, 2n) divides and differentiates into 256 spermatozoa (haploid, n) during spermatogenesis. To complete spermatogenesis and produce approximately 150 x 10(6) spermatozoa each day in a healthy man, germ cells must migrate progressively across the seminiferous epithelium yet remain attach to the nourishing Sertoli cells. This active cell migration process involves precisely controlled restructuring events at the tight (TJ) and anchoring junctions at the cell-cell interface. While the hormonal events that regulate spermatogenesis by follicle-stimulating hormone and testosterone from the pituitary gland and Leydig cells, respectively, are known, less is known about the mechanism(s) that regulates junction restructuring during germ cell movement in the seminiferous epithelium. The relative position of tight (TJs) and anchoring junctions in the testis is of interest. Sertoli cell TJs that constitute the blood-testis barrier (BTB) are present side by side with anchoring junctions and are adjacent to the basement membrane. This intimate physical association with the TJs, the anchoring junctions and the basement membrane (a modified form of extracellul...Continue Reading

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Jul 10, 2009·Cell and Tissue Research·Stephanie J Ellis, Guy Tanentzapf
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