Transformation: how do nematode sperm become activated and crawl?
Protein & Cell
; (12): 755-761, 2012.
Article
em En
| WPRIM
| ID: wpr-757227
Biblioteca responsável:
WPRO
ABSTRACT
Nematode sperm undergo a drastic physiological change during spermiogenesis (sperm activation). Unlike mammalian flagellated sperm, nematode sperm are amoeboid cells and their motility is driven by the dynamics of a cytoskeleton composed of major sperm protein (MSP) rather than actin found in other crawling cells. This review focuses on sperm from Caenorhabditis elegans and Ascaris suum to address the roles of external and internal factors that trigger sperm activation and power sperm motility. Nematode sperm can be activated in vitro by several factors, including Pronase and ionophores, and in vivo through the TRY-5 and SPE-8 pathways. Moreover, protease and protease inhibitors are crucial regulators of sperm maturation. MSP-based sperm motility involves a coupled process of protrusion and retraction, both of which have been reconstituted in vitro. Sperm motility is mediated by phosphorylation signals, as illustrated by identification of several key components (MPOP, MFPs and MPAK) in Ascaris and the characterization of GSP-3/4 in C. elegans.
Texto completo:
1
Índice:
WPRIM
Assunto principal:
Fosforilação
/
Motilidade dos Espermatozoides
/
Espermatozoides
/
Transdução de Sinais
/
Proteínas de Helminto
/
Biologia Celular
/
Metabolismo
/
Nematoides
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Protein & Cell
Ano de publicação:
2012
Tipo de documento:
Article