期刊
PEPTIDES
卷 126, 期 -, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.peptides.2019.170236
关键词
Urotensin-II; Na+-H+ exchanger; Cl--OH- exchanger; Na+-HCO3- cotransporter; H+-linked monocarboxylate transporter
资金
- Ministry of Science and Technology [MOST 106-2320-B-016-003-MY2:MOST 106-2314-B-016 -037 -MY3]
- National Defense Medical Center, Taipei, Taiwan, R.O.C. [CH-NDMC-105-6, MAB-107-021, MAB-108-052]
- Tri-Service General Hospital, Taipei, Taiwan, R.O.C. [TSGH-C108-008-S05]
The regulation of intracellular pH (pH(i)) plays a vital role in various cellular functions. We previously demonstrated that three different acid extruders, the Na+-H+ exchanger (NHE), Na+-HCO3- co-transporter (NBC) and H+-linked monocarboxylate transporter (MCT), functioned together in cultured human radial artery smooth muscle cells (HRASMCs). However, the functions of acid-loading transporters in HRASMCs remain poorly understood. Urotensin II (U-II), one of the most potent vasoconstrictors, is highly expressed in many cardiovascular diseases. The aim of this present study was to determine the concentration effect of U-II (3 pM similar to 100 nM) on the functional activity of pH(i) regulators in HRASMCs. Cultured HRASMCs were derived from segments of human radial arteries obtained from patients undergoing bypass grafting. Changes in pH(i) recovery due to intracellular acidification and alkalization induced by NH4Cl prepulse and Na-acetate prepulse, respectively, were detected by microspectrofluorimetry with the pH-sensitive fluorescent dye BCECF. Our present study showed that (a) U-II increased the activity of NHE in a concentration-dependent manner but did not change that of NBC or MCT or resting pH(i), (b) the Cl--OH- exchanger (CHE) facilitated base extrusion, and (c) U-II induced a concentration-dependent increase in the activity of CHE. In conclusion, for the first time, our results highlight a concentration-dependent increase in the activity of NHE and CHE, but not NBC and MCT, induced by U-II in HRASMCs.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据