Margarethe Hoenig1, Duncan C Ferguson. 1. Department of Physiology and Pharmacology, College of Veterinary Medicine, University of Georgia, Athens 30602, USA.
Abstract
OBJECTIVE: To determine whether changes in concentrations of hormones involved in glucose and fatty acid homeostasis are responsible for the increased probability that neutered cats will develop obesity and diabetes mellitus. ANIMALS: 10 male and 10 female weight-maintained adult cats. PROCEDURE: Results of glucose tolerance tests and concentrations of hormones and nonesterified fatty acids (NEFA) were examined before and 4, 8, and 16 weeks after neutering. RESULTS: Caloric requirements for weight maintenance were significantly decreased 8 and 16 weeks after neutering in females. Glucose concentrations during a glucose tolerance test did not change in neutered females or males. The area under the curve (AUC) for insulin was significantly higher in males, compared with females, before neutering. However, the AUC for insulin increased and was significantly higher 4 and 8 weeks after neutering in females. The AUC for insulin did not change in neutered male cats. Leptin concentrations did not change in females but increased significantly in males 8 and 16 weeks after neutering. Thyroxine concentrations did not change after neutering; however, free thyroxine concentration was significantly higher in females than males before neutering. Baseline concentrations of NEFA were significantly higher in female than male cats before but not after neutering. Suppression of NEFA concentrations after glucose administration decreased successively in male cats after neutering, suggesting decreased insulin sensitivity. CONCLUSIONS AND CLINICAL RELEVANCE: Changes in NEFA suppression, caloric intake, and leptin concentrations may be indicators of, and possible risk factors for, the development of obesity in cats after neutering.
OBJECTIVE: To determine whether changes in concentrations of hormones involved in glucose and fatty acid homeostasis are responsible for the increased probability that neutered cats will develop obesity and diabetes mellitus. ANIMALS: 10 male and 10 female weight-maintained adult cats. PROCEDURE: Results of glucose tolerance tests and concentrations of hormones and nonesterified fatty acids (NEFA) were examined before and 4, 8, and 16 weeks after neutering. RESULTS: Caloric requirements for weight maintenance were significantly decreased 8 and 16 weeks after neutering in females. Glucose concentrations during a glucose tolerance test did not change in neutered females or males. The area under the curve (AUC) for insulin was significantly higher in males, compared with females, before neutering. However, the AUC for insulin increased and was significantly higher 4 and 8 weeks after neutering in females. The AUC for insulin did not change in neutered male cats. Leptin concentrations did not change in females but increased significantly in males 8 and 16 weeks after neutering. Thyroxine concentrations did not change after neutering; however, free thyroxine concentration was significantly higher in females than males before neutering. Baseline concentrations of NEFA were significantly higher in female than male cats before but not after neutering. Suppression of NEFA concentrations after glucose administration decreased successively in male cats after neutering, suggesting decreased insulin sensitivity. CONCLUSIONS AND CLINICAL RELEVANCE: Changes in NEFA suppression, caloric intake, and leptin concentrations may be indicators of, and possible risk factors for, the development of obesity in cats after neutering.
Authors: Margarethe Hoenig; Erin T Jordan; John Glushka; Saskia Kley; Avinash Patil; Mark Waldron; James H Prestegard; Duncan C Ferguson; Shaoxiong Wu; Darin E Olson Journal: Am J Physiol Regul Integr Comp Physiol Date: 2011-09-21 Impact factor: 3.619
Authors: Lisa M Freeman; John E Rush; Kathryn M Meurs; Barret J Bulmer; Suzanne M Cunningham Journal: J Feline Med Surg Date: 2012-09-21 Impact factor: 2.015
Authors: Alfreda Wei; Andrea J Fascetti; Kyoungmi Kim; Ada Lee; James L Graham; Peter J Havel; Jon J Ramsey Journal: PLoS One Date: 2014-02-26 Impact factor: 3.240
Authors: Oliver Deusch; Ciaran O'Flynn; Alison Colyer; Kelly S Swanson; David Allaway; Penelope Morris Journal: PLoS One Date: 2015-12-14 Impact factor: 3.240
Authors: David Allaway; Matthew S Gilham; Alison Colyer; Thomas J Jönsson; Kelly S Swanson; Penelope J Morris Journal: PLoS One Date: 2016-12-12 Impact factor: 3.240