| Autor: |
Caprioli B; Pharmacology Department, Biomedical Sciences Institute (ICB), São Paulo 05508-000, SP, Brazil., Eichler RAS; Pharmacology Department, Biomedical Sciences Institute (ICB), São Paulo 05508-000, SP, Brazil., Silva RNO; Pharmacology Department, Biomedical Sciences Institute (ICB), São Paulo 05508-000, SP, Brazil., Martucci LF; Pharmacology Department, Biomedical Sciences Institute (ICB), São Paulo 05508-000, SP, Brazil., Reckziegel P; Department of Clinical and Toxicological Analysis, Faculty of Pharmaceutical Sciences (FCF), University of São Paulo (USP), São Paulo 05508-000, SP, Brazil., Ferro ES; Pharmacology Department, Biomedical Sciences Institute (ICB), São Paulo 05508-000, SP, Brazil. |
| Abstrakt: |
Neurolysin oligopeptidase (E.C.3.4.24.16; Nln), a member of the zinc metallopeptidase M3 family, was first identified in rat brain synaptic membranes hydrolyzing neurotensin at the Pro-Tyr peptide bond. The previous development of C57BL6/N mice with suppression of Nln gene expression (Nln -/- ), demonstrated the biological relevance of this oligopeptidase for insulin signaling and glucose uptake. Here, several metabolic parameters were investigated in Nln -/- and wild-type C57BL6/N animals (WT; n = 5-8), male and female, fed either a standard (SD) or a hypercaloric diet (HD), for seven weeks. Higher food intake and body mass gain was observed for Nln -/- animals fed HD, compared to both male and female WT control animals fed HD. Leptin gene expression was higher in Nln -/- male and female animals fed HD, compared to WT controls. Both WT and Nln -/- females fed HD showed similar gene expression increase of dipeptidyl peptidase 4 (DPP4), a peptidase related to glucagon-like peptide-1 (GLP-1) metabolism. The present data suggest that Nln participates in the physiological mechanisms related to diet-induced obesity. Further studies will be necessary to better understand the molecular mechanism responsible for the higher body mass gain observed in Nln -/- animals fed HD. |
