| Texto completo | |
| Autor(es): |
Carraro-Lacroix, Luciene R.
[1, 2]
;
Lessa, Lucilia M. A.
[1]
;
Bezerra, Camila N. A.
[1]
;
Pessoa, Thaissa D.
[1]
;
Souza-Menezes, Jackson
[3, 4]
;
Morales, Marcelo M.
[4]
;
Girardi, Adriana C. C.
[1, 5]
;
Malnic, Gerhard
[1]
Número total de Autores: 8
|
| Afiliação do(s) autor(es): | [1] Univ Sao Paulo, Inst Biomed Sci, Dept Physiol & Biophys, BR-05508900 Sao Paulo - Brazil
[2] Univ Fed Sao Paulo, Dept Physiol, Sao Paulo - Brazil
[3] Univ Fed Rio de Janeiro, Macae, RJ - Brazil
[4] Univ Fed Rio de Janeiro, Inst Biophys Carlos Chagas Filho, Rio De Janeiro - Brazil
[5] Univ Sao Paulo, Inst Heart, Sch Med, BR-05508900 Sao Paulo - Brazil
Número total de Afiliações: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | CELLULAR PHYSIOLOGY AND BIOCHEMISTRY; v. 26, n. 4-5, p. 563-576, 2010. |
| Citações Web of Science: | 16 |
| Resumo | |
Background/Aims: It has been widely accepted that chloride ions moving along chloride channels act to dissipate the electrical gradient established by the electrogenic transport of H+ ions performed by H+-ATPase into subcellular vesicles. Largely known in intracellular compartments, this mechanism is also important at the plasma membrane of cells from various tissues, including kidney. The present work was performed to study the modulation of plasma membrane H+-ATPase by chloride channels, in particular, CFTR and ClC-5 in kidney proximal tubule. Methods and Results: Using in vivo stationary microperfusion, it was observed that ATPase-mediated HCO3- reabsorption was significantly reduced in the presence of the Cl- channels inhibitor NPPB. This effect was confirmed in vitro by measuring the cell pH recovery rates after a NH4Cl pulse in immortalized rat renal proximal tubule cells, IRPTC. In these cells, even after abolishing the membrane potential with valinomycin, ATPase activity was seen to be still dependent on Cl-. siRNA-mediated CFTR channels and ClC-5 chloride-proton exchanger knockdown significantly reduced H+-ATPase activity and V-ATPase B2 subunit expression. Conclusion: These results indicate a role of chloride in modulating plasma membrane H+-ATPase activity in proximal tubule and suggest that both CFTR and ClC-5 modulate ATPase activity. Copyright (C) 2010 S. Karger AG, Basel (AU) | |
| Processo FAPESP: | 07/52945-8 - Importância do peptídeo semelhante ao glucagon 1 (GLP-1) na manutenção do volume extracelular: abordagem funcional, farmacológica e molecular |
| Beneficiário: | Adriana Castello Costa Girardi |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 06/50828-1 - Regulacao da h+atpase vacuolar de celulas de tubulos proximais de ratos por canais de cloreto. |
| Beneficiário: | Luciene Regina Carraro-Lacroix |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 09/51772-8 - Estudo da modulacao do trocador na+/h+ apical, nhe3, pelo transporte de glicose em tubulos renais "in vivo" e em celulas renais em cultura |
| Beneficiário: | Thaissa Dantas Pessoa |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 05/60491-1 - Acao da guanilina e uroguanilina no transporte ionico em tubulos renais. |
| Beneficiário: | Lucília Maria Abreu Lessa Leite Lima |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 04/01683-5 - Estudo molecular e funcional de transportadores de íons em membranas |
| Beneficiário: | Gerhard Malnic |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |