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BMC Immunology
Published in: BMC Immunology 1/2009

Open Access 01-12-2009 | Research article

Induction of mast cell accumulation, histamine release and skin edema by N49 phospholipase A2

Authors: Ji-Fu Wei, Xiao-Long Wei, Ya-Zhen Mo, Shao-Heng He

Published in: BMC Immunology | Issue 1/2009

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Abstract

Background

It has been recognized that phospholipase A2 (PLA2) is a crucial component of snake venom, which contributes greatly to snake venom induced inflammation in man. However, the mechanisms through which N49 PLA2 provoke inflammation remain unclear. Recently, a N49 PLA2, TM-N49 from Protobothrops mucrosquamatus crude venom was characterized in our laboratory. Since the purification procedure developed is able to supply us with relatively large quantity of highly purified TM-N49, we investigated the ability of TM-N49 in induction of inflammation.

Results

The results showed that TM-N49 provoked a dose dependent increase in microvascular leakage in the skin of rats. The potency of TM-N49 in induction of skin edema appeared similar potency of bradykinin and histamine. Pretreatment of rats with compound 48/80 diminished TM-N49 induced skin reaction and reduced mast cell numbers in rats. Ginkgolide B and cyproheptadine, but not terfenadine and quinacrine, inhibited TM-N49 elicited microvascular leakage when they were co-injected with the stimulus to rat skin. Moreover, TM-N49 was found to induce histamine release from human colon, lung and tonsil mast cells, and both metabolic inhibitors and pertussis toxin were capable of inhibiting TM-N49 elicited histamine release. TM-N49 induced mast cell accumulation in the peritoneum of mice, which was inhibited by co-injection of ginkgolide B, cyproheptadine and terfenadine. Intravenous injection of monoclonal antibodies against CD18, ICAM-1 and CD11a also blocked TM-N49 induced mast cell accumulation.

Conclusion

TM-N49 is a potent stimulus for skin edema, mast cell activation and accumulation.
Appendix
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Metadata
Title
Induction of mast cell accumulation, histamine release and skin edema by N49 phospholipase A2
Authors
Ji-Fu Wei
Xiao-Long Wei
Ya-Zhen Mo
Shao-Heng He
Publication date
01-12-2009
Publisher
BioMed Central
Published in
BMC Immunology / Issue 1/2009
Electronic ISSN: 1471-2172
DOI
https://doi.org/10.1186/1471-2172-10-21

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