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Reversibility of tachyphylaxis to C5a in guinea pig tissues, perfused human placental lobule, and umbilical artery

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Abstract

The spasmogenic effect of C5a is mediated by histamine and/or eicosanoids. Tachyphylaxis to this effect of C5a occurs rapidly, but the spasmogenic effects of C5a on a guinea pig lung parenchymal strips, field-stimulated ventricular papillary muscle, and human umbilical artery were completely restored by a 1-h period of drug-free rest, whereas that of guinea pig ileum was not. Perfusion of the isolated human placental lobule with C5a caused a transient pressor response that was largely abolished by indomethacin (5 μM), indicating mediation by cyclooxygenase metabolites. This pressor response to C5a was also completely restored following a 1-h rest period. The results show that tissue rest reverses tachyphylaxis to the spasmogenic effects of C5a in tissues where the response is mediated by cyclooxygenase metabolites. Where the response is mediated by histamine released by mast cells, restoration does not occur, presumably because of the catastrophic nature of mast cell degranulation. Histamine released in guinea pig papillary muscle by C5a may be from non-mast-cell sources.

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Authors and Affiliations

  1. Department of Physiology and Pharmacology, University of Queensland, QLD 4072, St. Lucia, Australia

    Stephen M. Taylor, Angela M. Finch, Anne E. Heron & Lindsay C. Brown

  2. Department of Medicine, University of Queensland, Mater Misericordiae Hospital, QLD 4101, Brisbane, Australia

    Timothy H. J. Florin

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  1. Stephen M. Taylor
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  2. Angela M. Finch
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  3. Anne E. Heron
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  4. Lindsay C. Brown
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  5. Timothy H. J. Florin
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Taylor, S.M., Finch, A.M., Heron, A.E. et al. Reversibility of tachyphylaxis to C5a in guinea pig tissues, perfused human placental lobule, and umbilical artery. Inflammation 18, 645–657 (1994). https://doi.org/10.1007/BF01535262

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