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Glucocorticosteroid effects on dog and rat serum complement.

R Müller-Peddinghaus, D Niepold, W Hillebrand

    International Journal of Immunopharmacology
    |January 1, 1985
    PubMed
    Summary

    Glucocorticosteroids like dexamethasone suppress the complement system in dogs, reducing total functional complement and C3 levels. Rats show less sensitivity to these steroid-induced humoral changes.

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    Area of Science:

    • Immunology
    • Pharmacology

    Background:

    • The in vivo inhibitory effects of glucocorticosteroids on the complement system are not fully understood.
    • Glucocorticosteroids are widely used for their anti-inflammatory and immunosuppressive properties.

    Purpose of the Study:

    • To investigate the in vivo effects of dexamethasone and prednisolone on the complement system in different animal models.
    • To elucidate the mechanisms underlying steroid-induced changes in complement levels.

    Main Methods:

    • In vitro studies on serum complement of dogs, rats, humans, and guinea pigs.
    • Subcutaneous administration of dexamethasone and prednisolone to beagle dogs and rats.
    • Measurement of total functional complement (CH50 U/ml) and C3 levels.
    • Analysis of serum protein patterns using cellulose acetate film electrophoresis (CAF).

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    Main Results:

    • Dexamethasone (0.4 mg/kg) significantly reduced total functional complement in dogs by approximately 40% within three days, a dose-dependent effect.
    • A decrease in serum C3 levels and alterations in serum protein patterns (reduced beta 1-beta 2, increased alpha 2) were observed in dogs.
    • Rats exhibited minimal changes in complement, C3, and serum protein patterns following prednisolone or dexamethasone administration, indicating relative insensitivity.
    • Partial recovery of complement levels in dogs occurred after six days without treatment.

    Conclusions:

    • Dexamethasone exerts a significant inhibitory effect on the complement system in vivo in dogs, but not in rats.
    • Altered liver protein synthesis of complement and acute phase proteins is likely responsible for the observed effects in dogs.
    • The differential sensitivity between species suggests complex regulatory mechanisms influenced by glucocorticosteroids.