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Article: Regulation of Sertoli cell myotubularin (rMTM) expression by germ cells in vitro

TitleRegulation of Sertoli cell myotubularin (rMTM) expression by germ cells in vitro
Authors
Issue Date2001
PublisherAmerican Society of Andrology. The Journal's web site is located at http://www.andrologyjournal.org
Citation
Journal of Andrology, 2001, v. 22 n. 2, p. 266-277 How to Cite?
AbstractRecent studies have shown that rat myotubularin (rMTM), the homolog of human myotubularin, which is a putative protein tyrosine phosphatase (PTP), is expressed by Sertoli cells in the rat testis. In addition, a significant increase in its steady-state mRNA level was detected in Sertoli cells at the time of inter-Sertoli tight junction (TJ) assembly in vitro. Since the interplay of protein kinases and phosphatases that determines the intracellular phosphoprotein content can, in turn, regulate the assembly and maintenance of TJ and anchoring junctions (AJ) in vitro, as demonstrated in different cell types, such as Madin-Darby canine kidney (MDCK) cells, endothelial cells, and Sertoli cells, rMTM may be an important molecule in regulating the assembly and maintenance of inter-Sertoli TJs during spermatogenesis. We thus sought to characterize its regulation. During testicular maturation, it was shown that the rMTM steady-state mRNA level increased drastically with aging. The expression of rMTM increased by as much as 2-4-fold in the rat testis at 45-60 days of age versus 20 days of age, coinciding with the onset of spermiation. This result seemingly suggests that rMTM may participate in the release of spermatids by disassembling the Sertoli-spermatid AJs, since PTP inhibitor was shown to perturb the inter-Sertoli TJ permeability barrier in vitro. Unexpectedly, when Sertoli cells were isolated from 20-, 45-, and 90-day-old rats and the steady-state rMTM level was quantified, it was shown that there is a drastic reduction in rMTM expression in adult Sertoli cells. Studies that used Sertoli-germ cell cocultures and Sertoli cells incubated with increasing germ cell-derived proteins have shown that the high level of testicular rMTM expression in the testis might be maintained by germ cells. Although work remains to be done to delineate the role of rMTM in the testis, these results illustrate that germ cells play a very active role in regulation testicular function by altering the phosphoprotein content.
Persistent Identifierhttp://hdl.handle.net/10722/84762
ISSN
2014 Impact Factor: 2.473
2015 SCImago Journal Rankings: 0.867

 

DC FieldValueLanguage
dc.contributor.authorLi, JCHen_HK
dc.contributor.authorLee, WWMen_HK
dc.contributor.authorMruk, Den_HK
dc.contributor.authorCheng, CYen_HK
dc.date.accessioned2010-09-06T08:56:49Z-
dc.date.available2010-09-06T08:56:49Z-
dc.date.issued2001en_HK
dc.identifier.citationJournal of Andrology, 2001, v. 22 n. 2, p. 266-277en_HK
dc.identifier.issn0196-3635en_HK
dc.identifier.urihttp://hdl.handle.net/10722/84762-
dc.description.abstractRecent studies have shown that rat myotubularin (rMTM), the homolog of human myotubularin, which is a putative protein tyrosine phosphatase (PTP), is expressed by Sertoli cells in the rat testis. In addition, a significant increase in its steady-state mRNA level was detected in Sertoli cells at the time of inter-Sertoli tight junction (TJ) assembly in vitro. Since the interplay of protein kinases and phosphatases that determines the intracellular phosphoprotein content can, in turn, regulate the assembly and maintenance of TJ and anchoring junctions (AJ) in vitro, as demonstrated in different cell types, such as Madin-Darby canine kidney (MDCK) cells, endothelial cells, and Sertoli cells, rMTM may be an important molecule in regulating the assembly and maintenance of inter-Sertoli TJs during spermatogenesis. We thus sought to characterize its regulation. During testicular maturation, it was shown that the rMTM steady-state mRNA level increased drastically with aging. The expression of rMTM increased by as much as 2-4-fold in the rat testis at 45-60 days of age versus 20 days of age, coinciding with the onset of spermiation. This result seemingly suggests that rMTM may participate in the release of spermatids by disassembling the Sertoli-spermatid AJs, since PTP inhibitor was shown to perturb the inter-Sertoli TJ permeability barrier in vitro. Unexpectedly, when Sertoli cells were isolated from 20-, 45-, and 90-day-old rats and the steady-state rMTM level was quantified, it was shown that there is a drastic reduction in rMTM expression in adult Sertoli cells. Studies that used Sertoli-germ cell cocultures and Sertoli cells incubated with increasing germ cell-derived proteins have shown that the high level of testicular rMTM expression in the testis might be maintained by germ cells. Although work remains to be done to delineate the role of rMTM in the testis, these results illustrate that germ cells play a very active role in regulation testicular function by altering the phosphoprotein content.-
dc.languageengen_HK
dc.publisherAmerican Society of Andrology. The Journal's web site is located at http://www.andrologyjournal.orgen_HK
dc.relation.ispartofJournal of Andrologyen_HK
dc.subject.meshGene Expression Regulation, Developmental-
dc.subject.meshGerm Cells - metabolism-
dc.subject.meshProtein Tyrosine Phosphatases - metabolism-
dc.subject.meshSertoli Cells - metabolism-
dc.titleRegulation of Sertoli cell myotubularin (rMTM) expression by germ cells in vitroen_HK
dc.typeArticleen_HK
dc.identifier.emailLee, WWM: hrszlwm@hku.hken_HK
dc.identifier.authorityLee, WWM=rp00728en_HK
dc.identifier.doi10.1002/j.1939-4640.2001.tb02180.x-
dc.identifier.pmid11229801-
dc.identifier.hkuros56823en_HK
dc.identifier.volume22-
dc.identifier.issue2-
dc.identifier.spage266-
dc.identifier.epage277-
dc.publisher.placeUnited States-

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