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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Kappa opioids modulate the arterial baroreflex control of heart rate in conscious young sheep.
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Kappa opioids modulate the arterial baroreflex control of heart rate in conscious young sheep.

机译:Kappa阿片类药物可调节有意识的幼羊对心律的动脉压力反射控制。

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The present study tested the hypothesis that kappa-opioids modulate the arterial baroreflex control of heart rate in conscious young sheep. Various parameters governing the arterial baroreflex control of heart rate were assessed before and after activation of kappa-opiate receptors (KOR) by i.v. administration of the specific KOR agonist U-50488H (experiment 1) or vehicle (experiment 2) to conscious, chronically instrumented lambs aged 42 +/- 2 days (n = 6). The 2 experiments were administered in random order at minimum intervals of 48 h. Thirty min after U-50488H treatment, there was an increase in diastolic and mean arterial pressure and in heart rate, returning to control levels by 90 min. A significant increase in the arterial pressure at the midpoint of the baroreflex range and in the minimum heart rate as well as a significant decrease in the heart rate range over which the arterial baroreflex operates were also seen at 30 min after U-50488H, gradually returning to control levels over 120 min. Vehicle had no effect on any of the parameters governing the arterial baroreflex control of heart rate. These data provide the first direct evidence that under physiological conditions in young lambs, the arterial baroreflex control of heart rate is altered after administration of the specific KOR agonist U-50488H, revealing a previously unidentified role for this opioid receptor.
机译:本研究检验了这种假设,即阿片类阿片类药物可调节有意识的幼羊对心率的动脉压力反射控制。在通过i.v.激活kappa-鸦片受体(KOR)之前和之后,评估了控制心率的动脉压力反射控制的各种参数。将特定的KOR激动剂U-50488H(实验1)或媒介物(实验2)施用给年龄在42 +/- 2天(n = 6)的有意识的,长期使用的小羊羔。随机以至少48小时的时间间隔进行2个实验。在U-50488H治疗后30分钟,舒张压和平均动脉压以及心率增加,到90分钟时恢复到对照水平。在U-50488H后30分钟时,在压力反射范围的中点和最小心率处的动脉压显着增加,以及在压力反射作用下心率范围的显着下降,在该压力下U-50488H逐渐恢复控制超过120分钟的水平。媒介物对控制心律的动脉压力反射控制的任何参数均无影响。这些数据提供了第一个直接的证据,即在幼小羔羊的生理条件下,施用特定的KOR激动剂U-50488H后,对心律的动脉压力反射控制发生了改变,从而揭示了该阿片受体的先前未知的作用。

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