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Molecular and Cellular Biochemistry

, Volume 275, Issue 1–2, pp 7–13 | Cite as

Protective effect of dietary capsaicin on induced oxidation of low-density lipoprotein in rats

  • R. K. Kempaiah
  • H. Manjunatha
  • K. SrinivasanEmail author
Article

Abstract

An animal study was carried out to examine the beneficial influence of the known hypocholesterolemic spice principle-capsaicin on the susceptibility of low-density lipoprotein to oxidation in normal and hypercholesterolemic condition. In rats rendered hypercholeterolemic by maintaining them on a cholesterol-enriched diet for eight weeks, inclusion of capsaicin (0.015%) in the diet, produced significant hypocholesterolemic effect. Oxidation of low-density lipoprotein was induced either by copper ion in vitro after its isolation, or by ferrous ion in vivo in experimental rats under either normal or hypercholesterolemic situation and the beneficial effect of dietary capsaicin on the same was evaluated. LDL oxidation was measured by the thiobarbituric acid reactive substances (TBARS) formed and relative electrophoretic mobility of oxidized LDL. Dietary capsaicin was found to be protective to the LDL oxidation in vitro in the case of normal rats as indicated by reduction in TBARS by more than 40%. In the case of LDL isolated from hypercholesterolemic rats the extent of copper induced LDL oxidation was significantly lower than that of LDL isolated from normal rats. Dietary capsaicin did not make any difference in the extent of LDL oxidation in vitro in hypercholesterolemic rats. Ferrous ion induced in vivo oxidation of LDL was 71% lower in capsaicin fed normal rats. In high cholesterol feeding, Fe-induced in vivo oxidation of LDL was 73% lower, while the same was still marginally lower in capsaicin fed hypercholesterolemic rats. Hepatic lipid peroxidation was significantly decreased by dietary capsaicin in normal rats. While a significantly decreased level of lipid peroxidation was observed in hypercholesterolemic rats compared to normal rats, the same was not significantly altered by dietary capsaicin. Results suggest that dietary spice principle capsaicin is protective to LDL oxidation both in vivo and in vitro under normal situation, while in hypercholesterolemic situation where the extent of LDL oxidation is already lowered, capsaicin does not offer any further reduction.

Keywords

capsaicin hypercholesterolemia LDL oxidation lipid peroxidation low-density lipoprotein 

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Copyright information

© Springer Science + Business Media, Inc. 2005

Authors and Affiliations

  • R. K. Kempaiah
    • 1
  • H. Manjunatha
    • 1
  • K. Srinivasan
    • 1
    • 2
    Email author
  1. 1.Department of Biochemistry and NutritionCentral Food Technological Research InstituteMysoreIndia
  2. 2.Department of Biochemistry and NutritionCentral Food Technological Research InstituteMysoreIndia

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