The comparative analysis on diameters of gametic cell stages from diploid and tetraploid Catarina scallop indicated that cell size was significantly larger in tetraploids than in diploids for all oogenic and spermatogenic
stages (Table 1), corroborating the microphotograph observations.
Cryopreservation ofbovine spermatogenic
cells using different protective molecules.
a) The control rabbit showing normal appearance of spermatogenic
cells; spermatogonia (sg), primary spermatocyte (ps), spermatid (sp), and Sertoli cells (sc).
G proteins [alpha]-subunits were expressed in male sex organ Genes Animals/Humans Expression GNAQ Human Ovaries, prostate glands, and testes GNAQ/11 Rat Germ cells GNA12 Human Testes Rat Spermatogenic
cells and Leydig cells GNA13 Rat Spermatogenic
cells and Leydig cells G proteins Rat Pachytene spermatocytes, [alpha]-subunits round spermatids, Sertoli cells, peritubular cells GNAQ, G-protein subunit Galphaq.
There was a relationship between fish size and total area of spermatogenic
tissue, with larger fish containing more spermatogenic
crypts scattered among the previtellogenic oocytes.
Interestingly, CLUS has already been reported by Plotton and colleagues (2006) to be linked to spermatogenic
failure, with mRNA levels significantly lowered in testicular biopsies of azoospermic patients classified according to their testicular histology (Plotton et al.
Functional hierarchy and reversibility within the murine spermatogenic
stem cell compartment.
In fish having a gonad predominated by spermatogenic
tissue and the presence of spermatozoa, the TG made up more than half of the gonad complex, while spermatogenic
tissue, which was proximal to the gonoduct and urogenital papilla also exhibited primary growth oocytes along the periphery of this region (Figure 3d).
The presence of degenerating spermatogenic
cells that can be present in normal testis was less in rats that received different doses of PJ, especially middle and high doses when compared to the control.
Maintenance of advanced spermatogenic
cells in the adult rat testis: Quantitative relationship to testosterone concentration within the testis.
Group IV showed improvement in the spermatogenic
activity and maturation with excess mature spermatozoa in the lumen of tubules (H&E at 400 x) (Figure 4).
Photoperiod (long days) influences the rate of biosynthesis of gonadotropin hormones, which in turn act on the testes to promote more spermatogenic
activity and elevated serum testosterone level (McGuire et al.