Resetting protects efficiency of tubuloglomerular feedback.

Resetting protects efficiency of tubuloglomerular feedback.
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重置可保护肾小管肾小球反馈的效率。

DOI:
10.1046/j.1523-1755.1998.06713.x
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发表时间:
1998
期刊:
Kidney international. Supplement
影响因子:
--
通讯作者:
Blantz,RC
Blantz,RC
中科院分区:
--
文献类型:
--
作者:
Thomson,SC;Vallon,V;Blantz,RC

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重置保护肾小管肾小球反馈的效率。肾小管肾小球反馈(TGF)可能影响长期保护全身盐和水,或可能支配肾功能的每分钟自动调节。TGF最适合的任务取决于相对于TGF曲线的拐点的周围小管流的方向和TGF响应于延长的刺激而重置的趋势。目前的数据表明,TGF曲线是密切耦合到个别肾单位的环境流量,使系统能够补偿管流的负和正扰动。这种偶联是由肾小球体内的事件介导的,这些事件导致TGF曲线响应于肾小管血流的持续变化而横向重置。TGF的这种重置发生在施加刺激的30至60分钟内,表明TGF更适合于介导动态自动调节,而不是解释近端肾小管损伤期间的持续血管收缩。
Resetting protects efficiency of tubuloglomerular feedback.Tubuloglomerular feedback (TGF) may effect long-term protection of total body salt and water or may govern minute-to-minute autoregulation of renal function. The task for which TGF is best suited depends on the orientation of ambient tubular flow relative to the inflection point of the TGF curve and on the tendency of TGF to reset in response to prolonged stimulation. Current data suggest that the TGF curve is coupled closely to ambient flow in individual nephrons such that the system is capable of compensating both negative and positive perturbations in tubular flow. This coupling is mediated by events within the juxtaglomerular apparatus that cause the TGF curve to reset laterally in response to sustained shifts in tubular flow. This resetting of TGF occurs within 30 to 60 minutes of an applied stimulus, suggesting that TGF is better suited to mediate dynamic autoregulation than to account for sustained vasoconstriction during proximal tubular injury.
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