Bacterial Endotoxin Rapidly Stimulates Prolonged Endothelium-dependent Vasodilatation in the Isolated Perfused Rat Heart
نویسندگان
چکیده
2 Summary 1. The effects of bacterial lipopolysaccharide (Escherichia coli 0111-B4; LPS) on coronary vascular tone were examined in the isolated perfused rat heart. The role of nitric oxide and/or prostaglandin products of the cyclooxygenase pathway in mediating the actions of LPS were also investigated. 2. Coronary vascular tone was raised and maintained by a continuous perfusion of the thromboxane mimetic U46619 (5 nM). LPS perfusion (0.1-100 μg ml-1) caused a concentration-dependent fall in coronary tone without any significant change in the force of cardiac contractility.
منابع مشابه
Lipopolysaccharide Induced Activation of Toll Like Receptor 4 in Isolated Rat Heart Suggests a Local Immune Response in Myocardium
Background: Myocardial dysfunction is one of the major complications in patients with sepsis where there is a relationship between the blood level of cytokines and the onset of myocardial depression. In many cases of sepsis, the presence of Lipopolysaccharide (LPS) has been established. LPS Binding Protein (LBP) bound endotoxin is recognized by CD14/toll-like receptor-4 (TLR4) complexes in inna...
متن کاملSaffron Induced Relaxation in Isolated Rat Aorta via Endothelium Dependent and Independent Mechanisms
Crocus sativus L. (saffron) is a widely used food additive for its color and taste. The hypotensive effects of saffron have been shown in previous studies. The aim of this study was to evaluate the mechanism of vasodilatory effects induced by saffron on isolated rat aorta.To study the vasodilatory effects of saffron aqueous extract (0.5, 1 and 2 mg/mL), isolated rat thoracic aorta rings were co...
متن کاملEffect of endotoxemia on heart rate dynamics in rat isolated perfused hearts
Introduction: Beat-to-beat variation in heart rate shows a complex dynamics, and this complexity is changed during systemic inflammatory response syndrome (e.g. sepsis). It is not known whether or not cardiac pacemaker dynamical rhythm is affected by sepsis. The aim of this study was to investigate heart rate dynamics of isolated heart as well as expression of pacemaker channels (HCN) in a r...
متن کاملSaffron Induced Relaxation in Isolated Rat Aorta via Endothelium Dependent and Independent Mechanisms
Crocus sativus L. (saffron) is a widely used food additive for its color and taste. The hypotensive effects of saffron have been shown in previous studies. The aim of this study was to evaluate the mechanism of vasodilatory effects induced by saffron on isolated rat aorta.To study the vasodilatory effects of saffron aqueous extract (0.5, 1 and 2 mg/mL), isolated rat thoracic aorta rings were co...
متن کاملRole of Fructose as a Potent Antiarrhythmic and Anti-infarct agent in Isolated Rat Heart
In the current study, effects of acute short term administration of fructose on cardiac arrhythmias and myocardial infarction size following ischemia/reperfusion were investigated in isolated rat heart. The hearts were subjected to 30 min zero flow global ischemia followed by 120 min reperfusion. In the control group, the hearts were perfused by normal drug free Krebs-Henseleit (K/H) solution t...
متن کامل