Na(+)/H(+) exchange in mosquito Malpighian tubules.

Na(+)/H(+) exchange in mosquito Malpighian tubules.
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蚊子马尔皮基小管中的 Na( )/H( ) 交换。

DOI:
10.1152/ajpregu.2000.279.6.r1996
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发表时间:
2000
期刊:
American journal of physiology. Regulatory, integrative and comparative physiology
影响因子:
--
通讯作者:
Petzel,DH
Petzel,DH
中科院分区:
--
文献类型:
--
作者:
Petzel,DH

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在分离的蚊子马氏管中测量液体分泌和细胞内pH以确定Na+/H+交换的存在。在存在100 μM 5-(N-乙基-n-异丙基)-阿米洛利(EIPA)(一种Na+/H+交换的特异性抑制剂)的情况下,单个马氏管的液体分泌速率在体外被对照品的78%抑制。用2′,7 ′-双(2-羧乙基)-5(6)-羧基荧光素显微荧光测定单个马氏管稳态细胞内pH值。在0 mM细胞外Na+或存在100 μM EIPA的情况下浸泡马氏管,使稳态细胞内pH值降低0.5个pH单位。用NH 4Cl脉冲技术刺激Na+/H+交换器,从NH 4Cl诱导的急性酸负荷中恢复的速率为8.7 ± 1.0 × 10− 3 pH/s。在不存在细胞外Na+或存在100 μM EIPA的情况下,急性酸负荷后细胞内pH的恢复速率分别为0.7 ± 0.6和−0.3 ± 0.3 × 10− 3 pH/s。这些结果表明,蚊子马氏管具有Na+/H+交换。
Fluid secretion and intracellular pH were measured in isolated mosquito Malpighian tubules to determine the presence of Na+/H+exchange. Rates of fluid secretion by individual Malpighian tubules in vitro were inhibited by 78% of control in the presence of 100 μM 5-(N-ethyl-n-isopropyl)-amiloride (EIPA), a specific inhibitor of Na+/H+exchange. Steady-state intracellular pH was measured microfluorometrically by using 2′,7′-bis(2-carboxyethyl)-5(6)-carboxyfluorescein in individual Malpighian tubules. Bathing the Malpighian tubules in 0 mM extracellular Na+or in the presence of 100 μM EIPA reduced the steady-state intracellular pH by 0.5 pH units. Stimulation of the Na+/H+exchanger by using the NH4Cl pulse technique resulted in a rate of recovery from the NH4Cl-induced acute acid load of 8.7 ± 1.0 × 10−3pH/s. The rates of recovery of intracellular pH after the acute acid load in the absence of extracellular Na+or in the presence of 100 μM EIPA were 0.7 ± 0.6 and −0.3 ± 0.3 × 10−3pH/s, respectively. These results indicate that mosquito Malpighian tubules possess a Na+/H+exchanger.
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