[Effect of endothelin-1 and its antagonists on the expression of endothelin receptors mRNA in HSC-T6 cells].
OBJECTIVE
To study the effect of endothelin-1 (ET-1) and its antagonists on the expression of endothelin and its receptors mRNA in HSC-T6 cells.


METHODS
Cultured HSC-T6 cells were randomly divided into 7 groups: Sham control group, ET-1 group (10 nmol/L ET-1), BQ-123 group [1 micromol/L BQ-123, a selective endothelin receptor A (ETRA) antagonist], BQ-788 group [1 micromol/L BQ-788, a selective endothelin receptor B (ETRB) antagonist], ET-1 + BQ123 group (10 nmol/L ET-1 + 1 micromol/L BQ-123), ET-1 + BQ-788 group (10 nmol/L ET-1 + 1 micromol/L BQ-788) and ET-1 + BQ-788 group (10 nmol/L ET-1 + 1 micromol/L BQ-123 + 1 micromol/L BQ-788). The expression of endothelin receptor mRNA of HSC-T6 cells was determined by reverse-transcription polymerase chain reaction (RT-PCR).


RESULTS
The expression of ETRA mRNA in ET-1 + BQ123 + BQ788 and ET-1 + BQ788 group was significantly lower than ET-1 group (0.329 +/- 0.044 and 0.292 +/- 0.023 vs. 0.440 +/- 0.030 P < 0.05). Compared with ET-1 group, the expression of ETRB mRNA in ET-1 + BQ788 group was down regulated obviously (0.499 +/- 0.136 vs. 0.153 +/- 0.071, P < 0.05). There was no significant difference in ET-1 + BQ123 group and ET-1 + BQ123 + BQ788 group when compared with ET-1 group (0.499 +/- 0.136 vs. 0.496 +/- 0.103 and 0.299 +/- 0.129, P > 0.05).


CONCLUSIONS
ET-1 has no obvious effect on the expression of ETRA mRNA in HSC-T6. ET-1 may up-regulate the expression of ETRB mRNA. Act on ETRA receptor, ET-1 can inhibit the expression of ETRB mRNA.
Zhang
Jun
J
Department of General Surgery, Beijing Friendship Hospital, Capital University of Medical Sciences, Beijing 100050, China.
Zhang
Zhong-tao
ZT
Wang
Yu
Y
Wang
Ping
P
Li
Jian-she
JS
Zhou
Yan-zhong
YZ
D000818:Animals; D002478:Cells, Cultured; D019332:Endothelin-1 / Q000494:pharmacology*; D005786:Gene Expression Regulation / Q000187:drug effects*; D022781:Hepatocytes / Q000187:drug effects* / Q000378:metabolism; D009842:Oligopeptides / Q000494:pharmacology; D010456:Peptides, Cyclic / Q000494:pharmacology; D010880:Piperidines / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D051381:Rats; D017207:Rats, Sprague-Dawley; D044022:Receptor, Endothelin A / Q000096:biosynthesis / Q000187:drug effects* / Q000235:genetics*; D044023:Receptor, Endothelin B / Q000096:biosynthesis / Q000187:drug effects* / Q000235:genetics*
D019332:Endothelin-1; D009842:Oligopeptides; D010456:Peptides, Cyclic; D010880:Piperidines; D012333:RNA, Messenger; D044022:Receptor, Endothelin A; D044023:Receptor, Endothelin B; C086539:BQ 788; C072247:cyclo(Trp-Asp-Pro-Val-Leu)