首页> 外文期刊>American Journal of Physiology >ANP, BNP, and CNP enhance bradycardic responses to cardiopulmonary chemoreceptor activation in conscious sheep.
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ANP, BNP, and CNP enhance bradycardic responses to cardiopulmonary chemoreceptor activation in conscious sheep.

机译:ANP,BNP和CNP在有意识的绵羊中增强了对心肺化学感受器激活的心动过缓反应。

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We demonstrated previously that atrial natriuretic peptide (ANP) enhances reflex bradycardia to intravenous serotonin [5-hydroxytryptamine (5-HT)] (von Bezold-Jarisch reflex) in rats. To determine whether 1) ANP affects this cardiopulmonary vagal reflex in another species and 2) B-type (BNP) and C-type (CNP) natriuretic peptides share with ANP the ability to modulate this reflex, we used intravenous phenylbiguanide (PBG), a 5-HT(3) agonist, as the stimulus to evoke a von Bezold-Jarisch reflex (dose-related, reproducible bradycardia) in conscious adult sheep (n = 5). Three doses of PBG (13 +/- 3, 20 +/- 3, and 31 +/- 4 microg/kg) injected into the jugular vein caused reflex cardiac slowing of -7 +/- 1, -15 +/- 2, and -36 +/- 3 beats/min, respectively, under control conditions. These doses of PBG were repeated during infusions of ANP, BNP, or CNP (10 pmol. kg(-1). min(-1) iv), or vehicle (normal saline). Each of the natriuretic peptides significantly (P < 0.05) enhanced the sensitivity of bradycardic responses to PBG by 94 +/- 8% (ANP), 142 +/- 55% (BNP), and 61 +/- 16% (CNP). Thus not only did ANP sensitize cardiopulmonary chemoreceptor activation in a species with resting heart rate close to that in humans, but BNP and CNP also enhanced von Bezold-Jarisch reflex activity in conscious sheep.
机译:我们先前证明心房利钠肽(ANP)可增强大鼠对静脉内血清素[5-羟色胺(5-HT)](von Bezold-Jarisch reflex)的反射性心动过缓。为了确定1)ANP是否会影响其他物种的这种心肺迷走神经反射,以及2)B型(BNP)和C型(CNP)利钠肽与ANP具有调节这种反射的能力,我们使用了静脉内苯双胍(PBG), 5-HT(3)激动剂,作为在有意识的成年绵羊(n = 5)中引起von Bezold-Jarisch反射(剂量相关的,可复制的心动过缓)的刺激。三剂量的PBG(13 +/- 3、20 +/- 3和31 +/- 4 microg / kg)注入颈静脉导致反射性心脏减慢-7 +/- 1,-15 +/- 2和在控制条件下分别为-36 +/- 3次/分钟。在输注ANP,BNP或CNP(10 pmol。kg(-1),min(-1)iv)或溶媒(生理盐水)期间重复这些剂量的PBG。每种利钠肽均显着(P <0.05)将心动过缓反应对PBG的敏感性提高94 +/- 8%(ANP),142 +/- 55%(BNP)和61 +/- 16%(CNP) 。因此,ANP不仅使静息心率接近人类物种的心肺化学感受器激活敏感,而且BNP和CNP还增强了有意识的绵羊的von Bezold-Jarisch反射活性。

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