Effect of extracellular potassium on the activity of distal renal tubule in mice / 上海交通大学学报(医学版)
Journal of Shanghai Jiaotong University(Medical Science)
;
(12): 984-990, 2019.
Artigo
em Chinês
| WPRIM
| ID: wpr-843350
ABSTRACT
Objective:
To investigate the effect of extracellular potassium (K+) concentration on the activities of sodium chloride co-transporter (NCC) and large conductance Ca2+-activated K+ channel (BK) in distal renal tubule of mice.Methods:
Six specific pathogen free (SPF) C57BL/6 mice aged 8 to 10 weeks were sacrificed,and the kidney slices were made with previously reported method. Then,these slices were incubated randomly in normal K+,high K+,BaCl2 and RbCl solutions,respectively. The abundance and phosphorylation level of NCC in kidney slices at different K+ concentrations and different time courses were detected by Western blotting. The overall and membrane expressions of BK in kidney slices were also detected after incubation with different K+ solutions for 2 h.Results:
Compared with normal K+ solution,NCC phosphorylation level was significantly decreased after incubation with high K+ solution for 5,15,30 min (all P<0.05),and NCC phosphorylation level was also decreased after intervention with K+ channel inhibitor Ba2+ or Rb+ (both P<0.05). After the treatment with high K+ solution for 2 h,neither the overall cell expression of BKα subunit and β4 subunit,nor membrane expression of BKα subunit was found significant changes compared with normal K+ incubation.Conclusion:
High K+ can directly down-regulate NCC phosphorylation level,which may be preparation for kaliuresis of the downstream tubule of distal convoluted tubule.
Texto completo:
DisponíveL
Índice:
WPRIM (Pacífico Ocidental)
Idioma:
Chinês
Revista:
Journal of Shanghai Jiaotong University(Medical Science)
Ano de publicação:
2019
Tipo de documento:
Artigo
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