Abstract
Effects of isoquercitrin (IQ) on anaphylactic responses were examined in cardiovascular systems of experimental animals. In pithed rats, IQ at 30 and 100 mg/kg (intravenous) significantly blunted both the initial hypertensive and the ensuing hypotensive responses during anaphylaxis. Death rate and tachycardia were also significantly inhibited after the same IQ doses in these rats. In isolated guinea pig hearts, IQ infusion at 30–100 μg/mL markedly reduced anaphylaxis-related coronary flow decrease, contractile force change, and heart rate responses (both tachycardia and arrhythmia). Cardiac histamine and creatine kinase releases were similarly diminished by IQ during anaphylaxis in the isolated guinea pig hearts. In two different isolated guinea pig vasculatures, the pulmonary artery and mesenteric arterial bed, anaphylactic vasoconstriction was reduced by IQ 30 and 100 μg/mL. It was observed that IQ had a marked inhibitory effect on histamine release from rat mast cells, and this mechanism was suggested as the major anti-anaphylactic mechanism. Direct inhibition of histamine-induced muscle contraction did not seem to be relevant, but IQ treatment successfully repressed intracellular calcium influx/depletion in mast cells. Overall, this study provided evidence for the beneficial effect of IQ on cardiac anaphylaxis, thus suggesting its potential applications in the treatment and prevention of related diseases.
Highlights
Systemic anaphylaxis is a rare but a dramatic and fatal allergic disease with a prevalence of0.05–2.0% in humans [1]
2. (A) Pressor response, (B) depressor response, and (C) the tachycardia rate were measured in the Pressor response, (B) depressor response, and (C) the tachycardia rate were measured in the cardiovascular system of the pithed rats
Coronary flow change, (B) contractility change, (C) tachycardiac response, (D) onset, and (E) duration arrhythmia were measured in OVA (1 mg)-treated isolated hearts from Hartley guinea pigs (n = 10 per time of arrhythmia were measured in OVA (1 mg)-treated isolated hearts from Hartley guinea pigs group)
Summary
Systemic anaphylaxis is a rare but a dramatic and fatal allergic disease with a prevalence of. Flavonoids are plant-derived polyphenolic substances that are ubiquitously found in numerous herbal medicines, and quercetin is one of the most extensively studied substance of all flavonoids for its beneficial pharmacological activities [4]. In contrast to a wide range of reported beneficial activities of quercetin flavonoids, only limited information circumstantially suggests that IQ might be effective against allergic anaphylaxis. There are almost no studies on the preventive effect of flavonoids against cardiovascular anaphylaxis symptoms. The beneficial effect of IQ on ovalbumin (OVA)-induced cardiac anaphylaxis was evaluated to provide evidence for its use on allergic anaphylaxis
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