Chronic intracerebroventricular infusion of angiotensin II causes dose- and sex-dependent effects on intake behaviors and energy homeostasis in C57BL/6J mice. Am J Physiol Regul Integr Comp Physiol 2022 Oct 01;323(4):R410-R421
Date
07/12/2022Pubmed ID
35816717Pubmed Central ID
PMC9512112DOI
10.1152/ajpregu.00091.2022Scopus ID
2-s2.0-85138457982 (requires institutional sign-in at Scopus site) 4 CitationsAbstract
The renin-angiotensin system (RAS) within the brain is implicated in the control of fluid and electrolyte balance, autonomic functions, blood pressure, and energy expenditure. Mouse models are increasingly used to explore these mechanisms; however, sex and dose dependencies of effects elicited by chronic intracerebroventricular (ICV) angiotensin II (ANG II) infusion have not been carefully established in this species. To examine the interactions among sex, body mass, and ICV ANG II on ingestive behaviors and energy balance, young adult C57BL/6J mice of both sexes were studied in a multiplexed metabolic phenotyping system (Promethion) during chronic infusion of ANG II (0, 5, 20, or 50 ng/h). At these infusion rates, ANG II caused accelerating dose-dependent increases in drinking and total energy expenditure in male mice, but female mice exhibited a complex biphasic response with maximum responses at 5 ng/h. Body mass differences did not account for sex-dependent differences in drinking behavior or total energy expenditure. In contrast, resting metabolic rate was similarly increased by ICV ANG II in a dose-dependent manner in both sexes after correction for body mass. We conclude that chronic ICV ANG II stimulates water intake, resting, and total energy expenditure in male C57BL/6J mice following straightforward accelerating dose-dependent kinetics, but female C57BL/6J mice exhibit complex biphasic responses to ICV ANG II. Furthermore, control of resting metabolic rate by ANG II is dissociable from mechanisms controlling fluid intake and total energy expenditure. Future studies of the sex dependency of ANG II within the brain of mice must be designed to carefully consider the biphasic responses that occur in females.
Author List
Oliveira V, Reho JJ, Balapattabi K, Ritter ML, Mathieu NM, Opichka MA, Lu KT, Grobe CC, Silva SD Jr, Wackman KK, Nakagawa P, Segar JL, Sigmund CD, Grobe JLAuthors
Justin L. Grobe PhD Professor in the Physiology department at Medical College of WisconsinPablo Nakagawa PhD Assistant Professor in the Physiology department at Medical College of Wisconsin
John J. Reho Research Scientist II in the Physiology department at Medical College of Wisconsin
Jeffrey L. Segar MD Professor in the Pediatrics department at Medical College of Wisconsin
Curt Sigmund PhD Chair, Professor in the Physiology department at Medical College of Wisconsin
MESH terms used to index this publication - Major topics in bold
Angiotensin IIAnimals
Blood Pressure
Female
Homeostasis
Infusions, Intraventricular
Injections, Intraventricular
Male
Mice
Mice, Inbred C57BL
