title: Effects of phospholipase A2 and metalloprotease fractions of Russell's viper venom on cytokines and renal hemodynamics in dogs.
abstract: Several enzymes in Russell's viper (Daboia siamensis) venom are involved in the venom effects and renal injury. The effects of fractional components of Russell's viper venom, phospholipase A(2) and metalloprotease fractions, were examined in two groups of four experimental dogs each. Animals received an intravenous injection of 140 μg/kg of each venom fraction. The inflammatory effects and renal hemodynamic changes were assessed. Plasma concentrations of interleukin-6 (IL-6), tumor necrosis factor-α (TNF-α) and PGE2 were elevated by both phospholipase A(2) (PLA(2)) and metalloprotease (MP) fractions. The plasma level of nitric oxide was increased after PLA(2) fraction injection but not with MP fraction injection. Leukocytosis with increase in lymphocytes, monocytes and granulocytes was observed after both PLA(2) and MP injections. Results from this study suggested that both PLA(2) and MP were inflammatory. Increased red blood cell count, hematocrit and hemoglobin concentration were observed in animals injected with PLA(2) fraction, but not with MP fraction. Hemodynamically, PLA(2) fraction induced marked decrease in mean arterial pressure with decreased renal vascular resistance initially followed later by increased renal vascular resistance. MP fraction caused less decrease of mean arterial pressure but increased renal vascular resistance throughout the experiment. Both enzymes decreased renal blood flow, glomerular filtration rate and urine flow. The findings indicate vasodilating effect of PLA(2) fraction and vasoconstricting effect and decreased cardiac function of MP fraction.
authors.affiliation: Queen Saovabha Memorial Institute, The Thai Red Cross Society, Bangkok 10330, Thailand.
authors.forename: Channarong
authors.initials: C
authors.lastname: Mitrmoonpitak
authors.forename: Pannipa
authors.initials: P
authors.lastname: Chulasugandha
authors.forename: Orawan
authors.initials: O
authors.lastname: Khow
authors.forename: Jureeporn
authors.initials: J
authors.lastname: Noiprom
authors.forename: Narongsak
authors.initials: N
authors.lastname: Chaiyabutr
authors.forename: Visith
authors.initials: V
authors.lastname: Sitprija
mesh_terms: D000210:Acute-Phase Reaction; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D016207:Cytokines / Q000378:metabolism*; D015232:Dinoprostone / Q000097:blood; D004285:Dogs; D005919:Glomerular Filtration Rate / Q000187:drug effects; D006339:Heart Rate / Q000187:drug effects; D015850:Interleukin-6 / Q000097:blood; D045726:Metalloproteases / Q000494:pharmacology*; D009569:Nitric Oxide / Q000097:blood; D054467:Phospholipases A2 / Q000494:pharmacology*; D012079:Renal Circulation / Q000187:drug effects*; D017840:Daboia; D014409:Tumor Necrosis Factor-alpha / Q000097:blood; D014563:Urodynamics / Q000187:drug effects; D014655:Vascular Resistance / Q000187:drug effects; D014757:Viper Venoms / Q000201:enzymology* / Q000494:pharmacology*
chemical_list: D016207:Cytokines; D015850:Interleukin-6; D014409:Tumor Necrosis Factor-alpha; D014757:Viper Venoms; D009569:Nitric Oxide; D054467:Phospholipases A2; D045726:Metalloproteases; D015232:Dinoprostone