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Characterization of S-nitrosation of SIRT1 in skeletal muscle in experimental model of aging

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Author(s):
Luciene Lenhare
Total Authors: 1
Document type: Master's Dissertation
Press: Campinas, SP.
Institution: Universidade Estadual de Campinas (UNICAMP). Faculdade de Ciências Médicas
Defense date:
Examining board members:
Eduardo Rochete Ropelle; Marco Antonio de Carvalho Filho; Adelino Sanchéz Ramos da Silva
Advisor: Eduardo Rochete Ropelle; José Rodrigo Pauli
Abstract

SIRT1, an NAD + deacetylase -dependent, exerts a critical role on mitochondrial biogenesis, glucose homeostasis and insulin sensitivity. However, the post-translational mechanism that SIRT1 controls the activity remains unclear. Here we investigate the role of Nitric Oxide Sythase (iNOS) on SIRT1 S-nitrosation in muscle of old mice. First we identify high levels of iNOS protein levels the skeletal muscle of aged mice and it was accompanied by the augment of SIRT1 S-nitrosation, PGC1? and FOXO1 acetylation and impairment of mitochondrial biogenesis. We demonstrated that nitric oxide (NO) donor treatment induced SIRT1 S-nitrosation and it reduced deacetylase activity. Interestingly, iNOS knockout mice exhibited low levels of SIRT1 S-nitrosation and higher mitochondrial biogenesis during aging, when compared to wild type mice. Finally, we that demonstrated SIRT1 S-nitrosation is a reversible mechanism, once the pharmacological iNOS inhibitor (L-NIL) administration, reduced SIRT1 S-nitrosation and increase the activity of the SIRT1 substrates, including, PGC1?, FOXO1 and AMPK in muscle of old mice. Collectively, our study provides substantial evidences the SIRT1 induces iNOS S-nitrosation and it is associated with the impairment of mitochondrial function in the skeletal muscle of aged mice (AU)

FAPESP's process: 12/14746-1 - Characterization of S-nitrosation of SIRT1 in skeletal muscle in experimental model of aging
Grantee:Luciene Lenhare
Support Opportunities: Scholarships in Brazil - Master