Abstract
Substance P (SP) injected into the synovial cavity of the rat knee resulted in an inflammatory response as measured by plasma protein extravasation into the joint capsule. This response was dose dependant over the range of ∼ 4 μM to ∼ 200 μM. Part of this inflammatory response was mediated via mast cells as pre-treatment of the animals with a mast cell degranulator (compound 48/80) resulted in a 66% reduction of the response. A direct effect of SP on the vascular receptors may also contribute to the inflammatory response as pre-treatment with the substance P antagonist (SPA)d-Pro 4 d-Trp 7,9,10 SP4–11 also reduces the inflammatory response. Intra-articular injections of the H1 blocker diphenhydramine or the H2 blocker cimetidine significantly blocked the SP-induced inflammatory response. The 5-hydroxytryptamine (5-HT) antagonist methysergide proved to be even more potent in blocking the SP-induced inflammatory response. No synergistic inhibition was observed with combinations of the different antagonists. Intra-articular injections of 5-HT elicited a much more pronounced inflammatory response than that produced by a 10-fold higher concentration of histamine.
The results suggest that SP produces increased vascular permeability partly via direct actions on the blood vessels and partly via mast cells. The inflammatory response occuring via mast cells appears to be mediated by histamine and to a greater extent by 5-HT.
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Lam, F.Y., Ferrell, W.R. Mediators of substance P-induced inflammation in the rat knee joint. Agents and Actions 31, 298–307 (1990). https://doi.org/10.1007/BF01997623
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DOI: https://doi.org/10.1007/BF01997623