Impaired effects of interleukin-1 beta on fever and thermogenesis in genetically obese rats.

MJ Dascombe, NJ Rothwell, A Hardwick, RA LeFeuvre

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Interleukin-1 beta (IL-1 beta) is an endogenous peptide which induced fever (1.8 degrees C rise in colonic temperature) when injected interacerebroventricularly (i.c.v., 80ng human recombinant IL-1 beta) into conscious lean rats. IL-1 beta also stimulated resting oxygen consumption (VO2) by 38 percent, in vitro thermogenic activity (mitochondrial GDP binding) of brown adipose tissue (BAT) by almost two-fold, and blood flow to brown fat (assessed from the distribution of radiolabelled microspheres) by nine-fold in lean animals. Genetically obese Zucker rats showed only small increases in temperature (0.5 degrees C), VO2 (15 percent) and blood flow to BAT (less than two-fold), and no change in GDP binding, but exhibited normal thermogenic responses to i.c.v. injection of corticotrophin releasing factor (GRF). The results indicate that the obese Zucker is insensitive to the central effects of interleukin; this may explain the reduced febrile responses to endotoxin which have previously been reported.
    Original languageEnglish
    JournalInternational journal of obesity.
    Volume13
    Issue number3
    Publication statusPublished - 1989

    Keywords

    • drug effects: Adipose Tissue
    • Animals
    • drug effects: Body Temperature Regulation
    • Female
    • chemically induced: Fever
    • pharmacology: Interleukin-1
    • Male
    • physiopathology: Obesity
    • Rats
    • Rats, Inbred Strains
    • Rats, Zucker
    • Support, Non-U.S. Gov't

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