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  • Title: Inhibition of human complement components by Loxosceles reclusa venom.
    Author: Futrell JM, Morgan PN.
    Journal: Int Arch Allergy Appl Immunol; 1978; 57(3):275-8. PubMed ID: 659016.
    Abstract:
    Venom from the brown recluse spider, Loxosceles reclusa, was capable of inactivation human C1-C7 in vitro. This inactivation occurred if venom was added to fresh adult human serum, human cord serum, or functionally pure specific human components. Optimal incubation conditions for the inactivation of each component were determined and were found generally to be in the range of 25 or 37 degrees C for 30-60 min. The alternative complement pathway did not appear to be involved, since C1, C4, and C2 were readily inactivated, and inactivation took place in sera depleted of factor B of the properdin system. Venom-induced inactivation appeared to require few, if any, serum cofactors, because, with the possible exception of C2, functionally pure components, as well as those in sera, were readily inactivated.
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