ABSTRACT
<p><b>OBJECTIVE</b>To study the antipyretic effect of baicalin in inhibiting yeast-induced fever in rats and the influence on inflammatory cytokine, then explore the possible mechanism of baicalin in inhibiting yeast-induced fever in rats.</p><p><b>METHODS</b>Rat modles of pyrexia were established by subcutaneous injection of yeast (2 g x kg(-1)); the rats of were divided into the normal control, model, baicalin high, medium and low-dose group and the effect of baicalin on the changes of the rats' temperature were observed. Dual antibody ELISA method was used to test the changes of IL-6, IL-1beta and TNF-alpha contents in in serum , hypothalamus and cerebral spinal fluid (CSF). Then analyze the correlation between the inhibition ratio of temperature heighten on three different dose of baicalin and the inhibition ratio of the contents heighten on IL-6, IL-1beta and TNF-alpha.</p><p><b>RESULT</b>The high dose of baicalin significantly inhibited the yeast-induced fever of rats, and decresesed IL-6, IL-1beta and TNF-alpha contents in serum, hypothalamus and CSF. The inhibition ratio of temperature heighten of baicalin had direct correlation with the inhibition ratio of the heighten on IL-1beta content in serum, hypothalamus and CSF (r = 0.873, P < 0.05), also dose TNF-alpha (r = 0.862, P < 0.01).</p><p><b>CONCLUSION</b>Baicalin may have obvious antipyretic effect by decreasing the increasing contents of IL-1beta and TNF-alpha in rats.</p>
Subject(s)
Animals , Male , Rats , Body Temperature , Cytokines , Blood , Cerebrospinal Fluid , Metabolism , Fever , Blood , Cerebrospinal Fluid , Drug Therapy , Flavonoids , Pharmacology , Therapeutic Uses , Hypothalamus , Metabolism , Rats, Sprague-Dawley , Time FactorsABSTRACT
AIM To study the effects of recombinant human IL 1 receptor antagonist (IL 1ra) on isolated airway smooth muscle tissue. METHODS Changes of isolated organ's tension were monitored with force displacement transducer and MedLab recording system. RESULTS ①IL 1ra haddirect relaxant effect in normal and ovalbumin sensitized pulmonary as well as tracheal smooth muscle. The mean EC 50 values were 1 29?10 -8 mol?L -1 and 8 06?10 -8 mol?L -1 in normal pulmonary and tracheal smooth muscle, but the mean EC 50 values were 2 61?10 -7 mol?L -1 and 5 88?10 -7 mol?L -1 in ovalbumin sensitized pulmonary and tracheal smooth muscle. Therefore the relaxation responses of sensitized airway smooth muscle to IL 1ra were lower than those of normal pulmonary and tracheal smooth muscle.②IL 1ra(10 -9 ～10 -5 mol?L -1 ) concentration dependently inhibit contraction responses to histamine(10 -3 mol?L -1 ) in normal pulmonary and tracheal smooth muscle, compared with administrating solvent PBS group ( P