Kinin B1 receptor modulates mitochondrial activity responsivity in fasting and voluntary exercise

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Item Type:	Article
Title:	Kinin B1 receptor modulates mitochondrial activity responsivity in fasting and voluntary exercise
Creators Name:	Arruda, A.C., Budu, A., de Menezes, T.N., Bader, M., Araujo, R.C. and Freitas-Lima, L.C.
Abstract:	The Kallikrein-Kinin System (KKS) plays an important role in energy metabolism. We have previously described the importance of the kinin B1 receptor (B1R) in metabolism regulation. Considering that the liver manages the different energy demands of different body tissues, we combined two stressful conditions - fasting and voluntary exercise - to address how B1R may affect liver metabolism, focusing on mitochondrial function. AIMS: To investigate how the kinin B1 receptor (B1R) modulates mitochondrial activity under stress conditions, focusing on the rate of energy expenditure and shift in metabolism. MAIN METHODS: Wild-type and B1R-knockout (B1KO) male mice remained in a calorimetric cage with a wheel for 7 days; 48 h before euthanasia, half of the animals from both groups were submitted to fasting conditions. Mitochondrial activity, ketone bodies, and gene expression involving mitochondrial activity were evaluated. KEY FINDINGS: B1R modulates the mitochondrial activity under fasting and voluntary exercise, reducing the VO(2) expenditure and HEAT. B1KO animals who exercised and underwent fasting did not have increased glucose levels, suggesting a preference for lipids as an energy source. Moreover, these animals displayed RER around 0.8, which indicates a β-oxidation increment. Interestingly, the lack of B1R did not induce mitochondrial activity and biogenesis, suggesting interference in metabolism responsivity, a condition modulated by sirtuins under PGC-1α control. SIGNIFICANCE: B1R modulates mitochondrial respiratory control ratios, which suggests metabolic suppression, influencing hepatic metabolism and, consequently, energy homeostasis.
Keywords:	Kinin B1 Receptor, Glucose Metabolism, Fasting, Metabolic Flexibility, Mitochondria, Animals, Mice
Source:	Life Sciences
ISSN:	0024-3205
Publisher:	Elsevier
Volume:	309
Page Range:	121034
Date:	15 November 2022
Official Publication:	https://doi.org/10.1016/j.lfs.2022.121034
PubMed:	View item in PubMed

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