Effects of fosinopril and losartan on the expression of Toll- like receptor 4 in renal tubular epithelia cells.
- Author:
Tian-feng TANG
1
;
Qiao-ling ZHOU
;
Li-li ZHU
;
Rong TANG
;
Xiang AO
Author Information
1. Department of Nephrology, Xiangya Hospital, Central South University, Changsha 410008, China.
- Publication Type:Journal Article
- MeSH:
Animals;
Cell Line;
Epithelial Cells;
immunology;
metabolism;
Fosinopril;
pharmacology;
Hypertension;
complications;
Kidney Diseases;
prevention & control;
Kidney Tubules;
cytology;
metabolism;
Losartan;
pharmacology;
RNA Interference;
RNA, Messenger;
biosynthesis;
genetics;
Rats;
Toll-Like Receptor 4;
biosynthesis;
genetics
- From:
Journal of Central South University(Medical Sciences)
2008;33(10):958-965
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVE:To determine the mechanism of Toll-like receptor 4(TLR4) in hypertensive renal injury and the protective effect of fosinopril(Fos) and losartan(Los).
METHODS:NRK-52E was incubated into 5 groups: NRK-52E (normal control), NRK-52E+AngII, NRK-52E+AngII+Fos(10(-5) mmol/L),and NRK-52E+AngII+Los(10(-5) mmol/L), NRK-52E +AngII+Fos(10(-5) mmol/L)+Los(10(-5) mmol/L). TLR4-specific RNAi plasmids were stably transfected into NRK-52E. After 24 h, TLR4, IL-6, and TNF-alpha mRNAs were examined by reverse transcription-polymerase chain reaction(RT-PCR). TLR4 proteins were detected by Western blot, NF-kappaB nuclear translocations were tested by immunocytochemistry,and IL-6 and TNF-alpha supernatant levels were tested by enzyme linked immuno-sorbent assay(ELISA).
RESULTS:TLR4, NF-kappaB, IL-6,and TNF-alpha were highly expressed in AngII induced NRK-52E(P<0.01). In NRK-52E that was stably transfected TLR4-special RNAi plamids, TLR4 protein and mRNA expression were obviously inhibited(P<0.05). After stimulation by AngII, the TLR4, IL-6, TNF-alpha levels in the stabe transfection group were increased compared with the normal group(P<0.05). Fos or/and Los down-regulated TLR4, IL-6, and TNF-alpha expressions(P<0.05), but no cooperation was observed.
CONCLUSION:TLR4 may lead to inflammatory reaction in hypertensive renal injury. Fos or/and Los can decrease the expressions of TLR4 and correlate inflammatory factors, which may be part of the renal protective mechanism.
