Linked Life Data

16466717

Source:http://linkedlifedata.com/resource/pubmed/id/16466717

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
5
pubmed:dateCreated
2006-2-14
pubmed:abstractText
To understand the mechanism regulating spermatozoa motility, it is important to investigate the mechanism regulating the conversion of microtubule sliding into flagellar bending. Therefore, we analyzed microtubule sliding and its conversion into flagellar bending using a demembranated spermatozoa model in which microtubule sliding and flagellar bending could be analyzed separately by treating the demembranated spermatozoa with and without dithiothreitol, respectively. Using this model, we examined the roles of cAMP and its target molecules in regulating flagellar bending and microtubule sliding. Although flagellar bending did not occur in the absence of cAMP, microtubule extrusion occurred without it, suggesting that cAMP is necessary for the conversion of microtubule sliding into flagellar bending, but not for microtubule sliding itself. The target of cAMP for regulating flagellar bending was not cAMP-dependent protein kinase (PKA), since flagellar bending was still observed in the spermatozoa treated with a PKA-specific inhibitor. Alternatively, the Epac/Rap pathway may be the target. Epac2 and Rap2 were detected in hamster spermatozoa using immunoblotting. Since Rap2 is a GTPase, we investigated the flagellar bending of demembranated spermatozoa treated with GTPgammaS. The treatment markedly increased the beat frequency and bending rate. These results suggest that cAMP activates the Epac/Rap pathway to regulate the conversion of microtubule sliding into flagellar bending.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0014-5793
pubmed:author
pubmed:issnType
Print
pubmed:day
20
pubmed:volume
580
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
1515-20
pubmed:meshHeading
pubmed:year
2006
pubmed:articleTitle
Roles of cAMP in regulating microtubule sliding and flagellar bending in demembranated hamster spermatozoa.
pubmed:affiliation
Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo, Shinryoiki-Seimei, Building 302, Kashiwa City, Chiba 277-8562, Japan.
pubmed:publicationType
Journal Article