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Originally published In Press as doi:10.1194/jlr.M600215-JLR200 on June 30, 2006

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Journal of Lipid Research, Vol. 47, 2042-2048, September 2006
Copyright © 2006 by American Society for Biochemistry and Molecular Biology

The age-related paraoxonase 1 response is altered by long-term caloric restriction in male and female rats

Elena Thomàs-Moyà, Magdalena Gianotti, Ana M. Proenza and Isabel Lladó1

Grup de Metabolisme Energètic i Nutrició, Departament de Biologia Fonamental i Ciències de la Salut, Institut Universitari d'Investigació en Ciències de la Salut, Universitat de les Illes Balears, Palma de Mallorca, Spain

Published, JLR Papers in Press, June 30, 2006.

1 To whom correspondence should be addressed. e-mail: isabel.llado{at}uib.es

Caloric restriction (CR) has been shown to attenuate age-related oxidative damage and to improve major atherosclerotic risk factors. Paraoxonase 1 (PON1), an enzyme specifically associated with HDL containing apolipoproteins A-I and J, has been reported to prevent the proatherosclerotic effects of oxidized LDL. The aim of this study was to evaluate whether modulation of PON1 activity is part of the underlying CR mechanisms that attenuate the age-associated negative effects. Experimental groups were 1 year old rats of both genders subjected to 40% CR for 1 year and two ad libitum-fed groups, also including rats of both genders, euthanized at 6 months or 2 years. Aging impaired the serum lipid profile and increased lipid peroxidation, PON1 activities, and the content of both PON1 and apolipoprotein J in HDL, which suggests an HDL subfraction redistribution to protect LDL more effectively from oxidation. The CR-associated improved lipid profile and the decreased lipid peroxide levels would lead to the decreased arylesterase activity seen in old CR animals, suggesting that PON1 modulation is not an integral part of the main antioxidant mechanisms of CR but rather that CR would determine a more youthful and less oxidative situation in which the protection of LDL would be less necessary.

Supplementary key words aging • gender • apolipoprotein A-I • apolipoprotein J • lipid peroxidation

Abbreviations: apoA-I, apolipoprotein A-I; CR, caloric restriction; PON1, paraoxonase 1; SR-BI, scavenger receptor class B type I; TBARS, thiobarbituric acid-reactive substances


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