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The Journal of Immunology, Vol 142, Issue 7 2401-2404, Copyright © 1989 by American Association of Immunologists

ARTICLES

Biologic activity of a C2-derived peptide. Demonstration of a specific interaction with guinea pig lung tissues

S Cholin, NP Gerard, CJ Strang and AE Davis 3d
Department of Medicine, Children's Hospital, Boston, MA 02115.

A synthetic peptide derived from the carboxy terminus of C2b has been investigated for its ability to induce the contraction of guinea pig lung parenchymal strips. This peptide is known to enhance vascular permeability in guinea pig and human skin, and to induce contraction of estrous rat uterus. This C2 peptide (C2 207-223) is active from 5 x 10(- 5) M to 5 x 10(-4) M and is not tachyphylactic to itself. No cross- activity between C2 207-223 and C5a or C3a could be demonstrated. C2 207-223 is not inhibited by antihistamines or cyclooxygenase inhibitors. These data indicate that the peptide exerts its action via a mechanism distinct from those of the C3a and C5a anaphylatoxins.




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