Metabolic rate and aging: effects of food restriction and thyroid hormone on minimal oxygen consumption in rats

Aging : Clinical and Experimental Research
R McCarterJ R McGee

Abstract

Metabolic rate (MR) is widely regarded as an important component of aging processes. Decreased MR has been suggested as a possible mechanism of the life-prolonging action of food restriction in rodents and recent reports show lowered plasma levels of tri-iodothyronine (T3), a regulator of MR, in food restricted rodents. In order to study the relationship between MR, food restriction, thyroid status and aging we measured the Minimal Oxygen Consumption (MOC) of barrier-raised Fischer 344 male rats fed ad libitum (Group A) or fed a diet restricted to 60% of ad libitum intake (Group R). Oxygen consumption (VO2) was also measured over 24 hr to establish the relationship between MOC and VO2 under usual living conditions. Results show: (i) MOC declines with age in both groups of rats; (ii) there is no difference in MOC of Groups A and R rats; (iii) MOC of Group R rats is significantly more sensitive to doses of injected T3 than MOC of Groups A rats at all ages; and (iv) MOC of both groups of rats is significantly lower than the lowest VO2 recorded under usual living conditions. The results indicate that a decrease in MR is not the mechanism by which food restriction retards aging processes in rodents. The results also suggest no chang...Continue Reading

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Citations

Jun 14, 1991·Mechanisms of Ageing and Development·H E EnescoB P Yu
Aug 30, 2002·The International Journal of Biochemistry & Cell Biology·B J Merry
Dec 1, 1991·Aging : Clinical and Experimental Research·R J McCarter
Jun 1, 1991·Aging : Clinical and Experimental Research·E J Masoro, R J McCarter
Mar 5, 2013·Experimental Gerontology·Ines Sanchez-Roman, Gustavo Barja
Jun 7, 2005·Mechanisms of Ageing and Development·Linda PartridgeWilliam Mair
Mar 1, 2005·Cell·Leonard Guarente, Frédéric Picard
Jul 9, 2013·The Journals of Gerontology. Series A, Biological Sciences and Medical Sciences·Reyhan WestbrookAndrzej Bartke
Feb 25, 2011·Proceedings. Biological Sciences·Chen HouAviv Bergman

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