A-single spermatogonia heterogeneity and cell cycles synchronize with rat seminiferous epithelium stages VIII-IX.
Biol Reprod
; 90(2): 32, 2014 Feb.
Article
em En
| MEDLINE
| ID: mdl-24389876
ABSTRACT
In mammalian testes, "A-single" spermatogonia function as stem cells that sustain sperm production for fertilizing eggs. Yet, it is not understood how cellular niches regulate the developmental fate of A-single spermatogonia. Here, immunolabeling studies in rat testes define a novel population of ERBB3(+) germ cells as approximately 5% of total SNAP91(+) A-single spermatogonia along a spermatogenic wave. As a function of time, ERBB3(+) A-single spermatogonia are detected during a 1- to 2-day period each 12.9-day sperm cycle, representing 35%-40% of SNAP91(+) A-single spermatogonia in stages VIII-IX of the seminiferous epithelium. Local concentrations of ERBB3(+) A-single spermatogonia are maintained under the mean density measured for neighboring SNAP91(+) A-single spermatogonia, potentially indicative of niche saturation. ERBB3(+) spermatogonia also synchronize their cell cycles with epithelium stages VIII-IX, where they form physical associations with preleptotene spermatocytes transiting the blood-testis barrier and Sertoli cells undergoing sperm release. Thus, A-single spermatogonia heterogeneity within this short-lived and reoccurring microenvironment invokes novel theories on how cellular niches integrate with testicular physiology to orchestrate sperm development in mammals.
Palavras-chave
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Epitélio Seminífero
/
Espermatogônias
/
Ciclo Celular
Limite:
Animals
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article