Micropuncture of superficial nephrons in avian (Sturnus vulgaris) kidney.
Micropuncture of superficial nephrons in avian (Sturnus vulgaris) kidney.
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禽类（Sturnus vulgaris）肾脏浅层肾单位的微穿刺。
DOI：
10.1152/ajprenal.1982.243.6.f561
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发表时间：
1982
期刊：
影响因子：
--
通讯作者：
Dantzler,WH
中科院分区：
文献类型：
--
作者：
Laverty,G;Dantzler,WH
在对照条件下（2.5%甘露醇输注），通过对欧洲椋鸟（Sturnus vulgaris）的浅表爬行动物型肾单位进行微穿刺，评价了单个肾单位肾小球滤过率（SNGFR）、液体吸收和钠、氯、钙、镁、钾和磷酸盐的小管转运。SNGFR平均为0.36 nl。min-1。钠、氯化物和水以相等的速率转运，约24%的过滤负荷被吸收至微穿刺点。钙沿着这些小管连续沿着吸收，超过钠和液体，而镁在小管中出现早期净分泌和晚期净吸收。钾运输变化很大，从一个单一的鸟的所有小管一般表现出净钾吸收或没有净运输。在后一组中，少数小管的数据表明净钾分泌。对于磷酸盐，来自一只鸟的单个小管能够净吸收或净分泌。所有小管的磷酸盐平均递送分数为1.62，但分泌速率显然可以超过磷酸盐过滤速率多达6倍。
Single nephron glomerular filtration rate (SNGFR), fluid absorption, and tubule transport of sodium, chloride, calcium, magnesium, potassium, and phosphate were evaluated under control (2.5% mannitol infusion) conditions by micropuncture of superficial, reptilian-type nephrons of European starlings (Sturnus vulgaris). SNGFR averaged 0.36 nl . min-1 . Sodium, chloride, and water were transported at equivalent rates with about 24% of the filtered load absorbed up to the point of micropuncture. Calcium was absorbed continuously along these tubules in excess of sodium and fluid, whereas magnesium appeared to undergo net secretion early and net absorption late in the tubules. Potassium transport varied considerably, with all tubules from a single bird generally showing either net potassium absorption or no net transport. In the latter group, data for a few tubules suggested net potassium secretion. For phosphate, individual tubules from a single bird were capable of either net absorption or net secretion. Mean fractional delivery of phosphate for all tubules was 1.62, but secretion rates apparently can exceed filtration rates for phosphate by as much as 6 times.