Abdulrahman Khazim Al Asmari
Research Center, Armed Forces Hospital, Riyadh, Saudi Arabia
ABSTRACT
The present study was conducted to investigate the inflammatory response induced by Echis coloratus venom (ECLV) in the rat hind-paw by measuring paw oedema. Non-heated ECLV (50 μg paw -1) caused a marked paw oedema (plateau) accompanied by intense haemorrhage whereas heated venom (97 °C, 30 s; 3.125-75 μ g paw -1) produced a dose and time-dependent non-haemorrhagic oedema. The response with heated ECLV was maximal within 15 min, disappearing over 24 h. Heated ECLV (50 μ g paw -1) was optimized to test the effect of various drugs on oedema induced by the ECLV. The results showed that cyproheptadine (H1 and H3) receptor antagonist highly (P < 0.001) reduced venom-induced rat paw oedema and was moderately (P<0.01) reduced by dexamethasone. A proteinase inhibator (aprotinin), cyclooxygenase inhibitor (indomethacin) and histamine (H1) receptor antagonist (chlorpheniramine) produced a low but significant inhibition of oedema formation. The commercially available antivenom was found to be ineffective when administered intravenously, whereas its local administration partially reduced rat paw oedema induced by ECLV, but was not statistically significant. The present study concluded that ECLV alone induced oedema and the expected principal mediators of this inflammatory response were serotonin, histamine, cyclo-oxygenase and other prostaglandins (PGs) and cytokines. Finally the polyspecific antivenom given intravenously could not prevent the oedema forming effect in rats.
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How to cite this article
Abdulrahman Khazim Al Asmari, 2003. Pharmacological Characterization of the Rat` s Paw Oedema Induced
by Echis coloratus Venom. Journal of Biological Sciences, 3: 309-319.
DOI: 10.3923/jbs.2003.309.319
URL: https://scialert.net/abstract/?doi=jbs.2003.309.319
DOI: 10.3923/jbs.2003.309.319
URL: https://scialert.net/abstract/?doi=jbs.2003.309.319
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