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Related Experiment Videos

Fever and acute phase reactants in the rat.

H van Vugt1, J van Gool, N E Deutz

  • 1Department of Experimental Internal Medicine, Academic Medical Centre, University of Amsterdam, The Netherlands.

British Journal of Experimental Pathology
|August 1, 1988
PubMed
Summary
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Fever in rats, induced by PGE2, triggers an acute phase response (APR). This response, involving corticosteroids and adrenaline, is crucial for synthesizing alpha-macrofetoprotein (alpha M FP).

Area of Science:

  • Physiology
  • Immunology
  • Neuroendocrinology

Background:

  • Corticosteroids and adrenaline can induce acute phase reactants (APRs) in rats.
  • Elevated plasma levels of these hormones are observed during fever.

Purpose of the Study:

  • To investigate the effect of fever, induced by intra-cerebroventricular (i.c.v.) injection of PGE2, on the acute phase response in rats.
  • To elucidate the hormonal and neural pathways involved in fever-induced APRs.

Main Methods:

  • Fever was induced in rats via i.c.v. injection of PGE2 or heat exposure.
  • Acute phase reactant response was measured by quantifying alpha-macrofetoprotein (alpha M FP) levels 24 hours post-induction.
  • Hormonal manipulations included adrenalectomy and alpha- or beta-adrenergic blockade.

Related Experiment Videos

  • Sympathetic nerve supply to the liver was disrupted using 6-OH dopamine.
  • Sodium salicylate was used to modulate hyperthermia.
  • Main Results:

    • PGE2-induced fever significantly increased alpha M FP levels, correlating with the maximal rise in body temperature.
    • Adrenalectomy completely abolished the APR, while fever magnitude remained unchanged.
    • Alpha-blockade reduced fever but did not affect APR.
    • Combined alpha- and beta-blockade abolished the APR despite a normal fever response.
    • Disruption of sympathetic innervation to the liver did not impede APR.
    • Induced hyperthermia via heat exposure elicited a comparable APR, suggesting fever itself, not just PGE2, triggers the response.
    • Sodium salicylate pretreatment resulted in variable alpha M FP increases during hyperthermia.

    Conclusions:

    • Fever, independent of tissue injury, effectively induces an acute phase response in rats.
    • The pathway likely involves circulating corticosterone and adrenaline, potentially mediated by beta-adrenergic stimulation.
    • Adrenal hormones play a critical role in mediating fever-induced APRs.