Читать книгу Bovine Reproduction - Группа авторов - Страница 62

As germ cells lack the necessary architecture for migration, SC are responsible for germ cell migration across the seminiferous epithelium. SC assist in the translocation of preleptotene spermatocyte from the basal to adluminal compartment of the ST across the blood–testis barrier [34]. Specialized adhesion junctions, ectoplasmic specializations, of SC attach to the spermatid head and translocate spermatids up and down across the seminiferous epithelium. Ectoplasmic specializations consist of regions of SC plasma membrane adherent to the spermatid head, a submembrane layer of tightly packed SC actin filaments, and an attached cistern of SC endoplasmic reticulum. Motor proteins of SC endoplasmic reticulum translocate ectoplasmic specializations and hence spermatids are also translocated [48].