By Sardul S. Guraya
The spermatogenesis and spermatozoa of mammals are of funda psychological curiosity to a large choice of educational and clinical disci plines; zoologists sustain curiosity in comparative biology of sper matogenesis and spermatozoa in several teams of mammals for selecting their phylogenetic interrelationships. hence, prior to now 15 years, a wealth of studies and papers were released at the morphology (including ultrastructure), histochemistry, automobile radiography, biochemistry (including immunology), and mobile physiol ogy of the seminiferous epithelium together with Sertoli cells, spermato genesis and spermatozoa in mammals. Hormonal law of sper matogenesis additionally types the topic to various reviews. study during this zone of reproductive biology maintains at a extraordinary fee, and new and important details looks day-by-day in quite a lot of journals, released symposia, and expert studies. The scattered nature of this knowledge makes it tough for a scientist, pupil or andrologist to move via even a small fraction of those guides at the biology of spermatogenesis and spermatozoa and so receive a common oversight of present task and new advances. truly, little or no try out has been made formerly to summarize and inte grate the colossal details which has turn into on hand because of use of recent innovations of microscopy, floor topography, histo chemistry, autoradiography, biochemistry, biophysics, immunology, molecular biology, in vitro structures, and so on. Much-needed interdisciplin ary method in biology of seminiferous epithelium, spermatogenesis and spermatozoa is especially tough and therefore missing.
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Extra resources for Biology of Spermatogenesis and Spermatozoa in Mammals
Example text
Sertoli cells in culture also secrete a few other specific proteins and a large number of more or less unidentified proteins (Rommerts et al. 1978, Ritzen et al. 1981, Wright et al. 1983).
1983) have demonstrated Sertoli cell maintenance of germ-cell viability. FSH and testosterone receptors but not LH receptors have been demonstrated in Sertoli cells (Dufau et al. 1973, A. Steinberger and E. Steinberger 1977, Courot et al. 1979, Courot 1980, Ouraya 1980, Risbridger et al. 1981, Ritzen et al. 1981, Reichert et al. 1982, Parvinen et al. 1983, Tindall et al. 1985). FSH binds to specific receptors on the Sertoli cell plasma membrane, stimulates adenylate cyclase, activates soluble cAMP-dependent protein kinase, and stimulates RNA and protein synthesis.
Actually, the interactions between Sertoli cells and differentiating male germ-cells, which certainly occur at the level of their plasma membrane, are dynamic and highly ordered with regard to the timing and spatial arrangements of successive waves of cellular differentiation. Germ-cells multiply at a rapid rate, and grow and shift along the sides and apex of the Sertoli cell. The shape of the latter therefore must alter continually to accommodate cyclic events associated with spermatogenesis. The Sertoli cell, having extensive plasma membrane surface area, shows complex and elaborate surface relationships to the germinal cells, supporting the concept of extensive metabolic exchanges between it and germ-cells, which take place at the cell's surface.