Zeng Jing,Lu Xi,Chen Ken,Yao Yonggang,Zhang Jun,Zeng Chunyu.Role of PM2.5 in regulation of G protein-coupled receptor kinase 4 in natriuresis in vitro[J].J Amry Med Univ (J Third Mil Med Univ),2014,36(10):1064-1067.
Zeng Jing,Lu Xi,Chen Ken,Yao Yonggang,Zhang Jun,Zeng Chunyu.Role of PM2.5 in regulation of G protein-coupled receptor kinase 4 in natriuresis in vitro[J].J Amry Med Univ (J Third Mil Med Univ),2014,36(10):1064-1067.DOI:
Objective G protein-coupled receptor kinase 4 (GRK4) affects renal sodium excretion via impairment of renal dopamine receptor
resulting in sodi
um retention and an increase in blood pressure. Previous studies pointed out that PM
2.5
was a risk factor and etiological factor of hypertension. Whether or not PM
2.5
is involved in the regulation of GRK4 and renal sodium excretion is investigated in this study. Methods We observed the regulatory effect of PM
2.5
on cell viability
Na
+
-K
+
-ATPase activity and GRK4 expression in WKY rat renal proximal tubule (RPT) cells. Moreover
we observed the regulatory effect of PM
2.5
on Na
+
-K
+
-ATPase activity in WKY rat RPT cells treated by GRK4 siRNA. Results The cell viability showed no difference in WKY rat RPT cells treated by different concentrations of PM
2.5
(10
50
and 100 μg/mL
P0.05). Compared with controls
Na
+
-K
+
-ATPase activity was significantly increased in the cells treated by 100 μg/mL PM
2.5
(
P
0.05)
and decreased by 10
-6
mol/L fenoldopam treatment (P0.05). PM
2.5
leaded to a higher expression of GRK4 and lower expression of dopamine D1 receptor in WKY rat RPT cells (
P
0.05). Na
+
-K
+
-ATPase activity in PM
2.5
-treated cells showed no difference after blocking GRK4 by siRNA (
P
0.05). Conclusion PM
2.5
increases GRK4 expression
decreases dopamine D1 receptor expression and increases Na
+
-K
+
-ATPase activity
showing regulatory effects on renal sodium excretion.