Sam68 mediates leptin-stimulated growth by modulating leptin receptor signaling in human trophoblastic JEG-3 cells

dc.creatorSánchez Jiménez, F.
dc.creatorPérez Pérez, A.
dc.creatorGonzález Yanes, C.
dc.creatorVarone, Cecilia Laura
dc.creatorSánchez Margalet, V.
dc.date2011-06
dc.identifierhttp://hdl.handle.net/11336/95901
dc.identifierSánchez Jiménez, F.; Pérez Pérez, A.; González Yanes, C.; Varone, Cecilia Laura; Sánchez Margalet, V.; Sam68 mediates leptin-stimulated growth by modulating leptin receptor signaling in human trophoblastic JEG-3 cells; Oxford University Press; Human Reproduction; 26; 9; 6-2011; 2306-2315
dc.identifier0268-1161
dc.identifierCONICET Digital
dc.identifierCONICET
dc.descriptionBackground Sam68, a member of the signal transduction and activation of RNA metabolism (STAR) family of RNA-binding proteins, has been previously implicated as an adaptor molecule in different signaling systems, including leptin receptor (LEPR) signaling. LEPR activation is known to stimulate JAK-STAT, MAPK and PI3K signaling pathways, thus mediating the biological effects of leptin in different cell types, including trophoblastic cells. We have recently found that leptin stimulation also promotes the overexpression and tyrosine phosphorylation of Sam68 in human trophoblastic JEG-3 cells, suggesting a role for Sam68 in leptin signaling and action in these cells. In the present work, we have studied the participation of Sam68 in the main signaling pathways activated by LEPR to increase growth and proliferation in trophoblastic JEG-3 cells. Methods We used an antisense strategy to down-regulate Sam68 expression in these cells, and we studied LEPR signaling by immunoprecipitation and poly-U affinity precipitation and by analyzing phosphorylation levels of signaling proteins by immunoblot. The effect of leptin on protein synthesis and proliferation was studied by 3[H]-leucine and 3[H]-thymidine incorporation. Results Sam68 knockdown impaired leptin activation of JAK-STAT, PI3K and MAPK signaling pathways in JEG-3 cells. We have also found that leptin-stimulated Sam68 tyrosine phosphorylation is dependent on JAK-2 activity, since the pharmacological inhibitor AG490 prevents the phosphorylation of Sam68 in JEG-3 cells. Finally, the trophic and proliferative effect of leptin in trophoblastic cells is dependent on Sam68 expression, since its down-regulation impaired the leptin-stimulated DNA and protein synthesis. Conclusions These data demonstrate that Sam68 participates in the main signaling pathways of LEPR to mediate the trophic and proliferative effect of leptin in human trophoblastic cells.
dc.descriptionFil: Sánchez Jiménez, F.. Universidad de Sevilla; España
dc.descriptionFil: Pérez Pérez, A.. Universidad de Sevilla; España
dc.descriptionFil: González Yanes, C.. Universidad de Sevilla; España
dc.descriptionFil: Varone, Cecilia Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Química Biológica de la Facultad de Ciencias Exactas y Naturales; Argentina
dc.descriptionFil: Sánchez Margalet, V.. Universidad de Sevilla; España
dc.formatapplication/pdf
dc.formatapplication/pdf
dc.languageeng
dc.publisherOxford University Press
dc.relationinfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/humrep/article/26/9/2306/720090
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/10.1093/humrep/der187
dc.rightsinfo:eu-repo/semantics/openAccess
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subjectLEPR SIGNALING
dc.subjectLEPTIN
dc.subjectPLACENTA
dc.subjectSAM68
dc.subjectTROPHOBLAST
dc.subjecthttps://purl.org/becyt/ford/3.1
dc.subjecthttps://purl.org/becyt/ford/3
dc.titleSam68 mediates leptin-stimulated growth by modulating leptin receptor signaling in human trophoblastic JEG-3 cells
dc.typeinfo:eu-repo/semantics/article
dc.typeinfo:ar-repo/semantics/artículo
dc.typeinfo:eu-repo/semantics/publishedVersion


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