首页> 外文期刊>American Journal of Physiology >Do P2X purinergic receptors regulate skeletal muscle blood flow during exercise?
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Do P2X purinergic receptors regulate skeletal muscle blood flow during exercise?

机译:P2X嘌呤能受体在运动过程中是否调节骨骼肌血流量?

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Although there is evidence that sympathetic nerves release ATP as a neurotransmitter to produce vasoconstriction via P2X purinergic receptors, the role of these receptors in the regulation of blood flow to exercising skeletal muscle has yet to be determined. We hypothesized that there is tonic P2X receptor-mediated vasoconstriction in exercising skeletal muscle. To test this hypothesis, the effect of P2X receptor blockade on skeletal muscle blood flow was examined in six exercising mongrel dogs. P2X receptor antagonism was accomplished with pyridoxal-phosphate-6-azophenyl-2'4'-disulfonic acid (PPADs). Animals were instrumented chronically with flow probes on the external iliac arteries of both hindlimbs and a catheter in one femoral artery. PPADs (40 mg) was infused as a bolus into the femoral artery catheter during steady-state exercise at 6 miles/h. Intra-arterial infusion of PPADs increased iliac blood flow from 542 +/- 55 to 677 +/- 69 ml/min (P < 0.05) and iliac vascular conductance from 5.17 +/- 0.62 to 6.53 +/- 0.80 ml.min(-1).mmHg(-1). The PPADs infusion did not affect blood flow in the contralateral iliac artery. These data support the hypothesis that P2X purinergic receptors produce vasoconstriction in exercising skeletal muscle.
机译:尽管有证据表明交感神经通过P2X嘌呤能受体释放ATP作为神经递质以产生血管收缩作用,但这些受体在调节骨骼肌运动血流中的作用尚待确定。我们假设在锻炼骨骼肌时有滋补性P2X受体介导的血管收缩。为了验证这一假设,在六只运动的杂种狗中检查了P2X受体阻滞对骨骼肌血流的影响。 P2X受体拮抗作用是用磷酸吡ido醛-6-偶氮苯基-2'4'-二磺酸(PPADs)完成的。用流动探针对动物进行长期检测,该探针在一条股动脉的后肢和导管的catheter外动脉上。在稳态运动期间,以6英里/小时的速度将PPADs(40 mg)推注到股动脉导管中。动脉内输注PPAD使increased血流量从542 +/- 55升至677 +/- 69 ml / min(P <0.05),血管电导从5.17 +/- 0.62增至6.53 +/- 0.80 ml.min( -1).mmHg(-1)。 PPADs输注不影响对侧动脉的血流。这些数据支持以下假设:P2X嘌呤能受体在锻炼骨骼肌时会产生血管收缩。

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