Please use this identifier to cite or link to this item: http://repositorio.unifesp.br/handle/11600/35311
Title: Bradykinin inhibits hepatic gluconeogenesis in obese mice
Authors: Barros, Carlos Castilho [UNIFESP]
Haro, Anderson [UNIFESP]
Russo, Fernanda Jaqueline [UNIFESP]
Schadock, Ines
Almeida, Sandro Soares [UNIFESP]
Reis, Felipe Castellani [UNIFESP]
Moraes, Milton Rocha [UNIFESP]
Haidar, Andre [UNIFESP]
Hirata, Aparecida Emiko [UNIFESP]
Mori, Marcelo [UNIFESP]
Pereira Bacurau, Reury Frank
Wurtele, Martin [UNIFESP]
Bader, Michael
Pesquero, Joao Bosco [UNIFESP]
Araujo, Ronaldo Carvalho [UNIFESP]
Universidade Federal de São Paulo (UNIFESP)
Max Delbruck Ctr Mol Med
Sch Arts Sci & Humanities
Keywords: bradykinin
gluconeogenesis
kinin receptor
leptin
ob/ob
obesity
Issue Date: 1-Oct-2012
Publisher: Nature Publishing Group
Citation: Laboratory Investigation. New York: Nature Publishing Group, v. 92, n. 10, p. 1419-1427, 2012.
Abstract: The kallikrein-kinin system (KKS) has been previously linked to glucose homeostasis. in isolated muscle or fat cells, acute bradykinin (BK) stimulation was shown to improve insulin action and increase glucose uptake by promoting glucose transporter 4 translocation to plasma membrane. However, the role for BK in the pathophysiology of obesity and type 2 diabetes remains largely unknown. To address this, we generated genetically obese mice (ob/ob) lacking the BK B2 receptor (obB2KO). Despite similar body weight or fat accumulation, obB2KO mice showed increased fasting glycemia (162.3 +/- 28.2 mg/dl vs 85.3 +/- 13.3 mg/dl), hyperinsulinemia (7.71 +/- 1.75 ng/ml vs 4.09 +/- 0.51 ng/ml) and impaired glucose tolerance when compared with ob/ob control mice (obWT), indicating insulin resistance and impaired glucose homeostasis. This was corroborated by increased glucose production in response to a pyruvate challenge. Increased gluconeogenesis was accompanied by increased hepatic mRNA expression of forkhead box protein 01 (FoxO1, four-fold), peroxisome proliferator-activated receptor gamma co-activator 1-alpha (seven-fold), phosphoenolpyruvate carboxykinase (PEPCK, three-fold) and glucose-6-phosphatase (eight-fold). FoxO1 nuclear exclusion was also impaired, as the obB2KO mice showed increased levels of this transcription factor in the nucleus fraction of liver homogenates during random feeding. Intraportal injection of BK in lean mice was able to decrease the hepatic mRNA expression of FoxO1 and PEPCK. in conclusion, BK modulates glucose homeostasis by affecting hepatic glucose production in obWT. These results point to a protective role of the KKS in the pathophysiology of type 2 diabetes mellitus. Laboratory Investigation (2012) 92, 1419-1427; doi:10.1038/labinvest.2012.105; published online 6 August 2012
URI: http://repositorio.unifesp.br/handle/11600/35311
ISSN: 0023-6837
Other Identifiers: http://dx.doi.org/10.1038/labinvest.2012.105
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