AIM: To elucidate the mechanisms of mesenteric vasodilation in portal hypertension (PHT), with a focus on endothelin signaling. METHODS: PHT was induced in rats by common bile duct ligation (CBDL). Portal pressure (PP...AIM: To elucidate the mechanisms of mesenteric vasodilation in portal hypertension (PHT), with a focus on endothelin signaling. METHODS: PHT was induced in rats by common bile duct ligation (CBDL). Portal pressure (PP) was measured directly via catheters placed in the portal vein tract. The level of endothelin-1 (ET-1) in the mesenteric circulation was determined by radioimmunoassay, and the expression of the endothelin A receptor (ETAR) and endothelin B receptor (ETBR) was assessed by immunofluorescence and Western blot. Additionally, expression of G protein coupled kinase-2 (GRK2) and β-arrestin 2, which influence endothelin receptor sensitivity, were also studied by Western blot. RESULTS: PP of CBDL rats increased significantly (11.89 ± 1.38 mmHg vs 16.34 ± 1.63 mmHg). ET-1 expression decreased in the mesenteric circulation 2 and 4 wk after CBDL. ET-1 levels in the systemic circulation of CBDL rats were increased at 2 wk and decreased at 4 wk. There was no change in ETAR expression in response to CBDL; however, increased expression of ETBR in the endothelial cells of mesenteric arterioles and capillaries was observed. In sham-operated rats, ETBR was mainly expressed in the CD31+ endothelial cells of the arterioles. With development of PHT, in addition to the endothelial cells, ETBR expression was noticeably detectable in the SMA+ smooth muscle cells of arterioles and in the CD31+ capillaries. Following CBDL, increased expression of GRK2 was also found in mesenteric tissue, though there was no change in the level of β-arrestin 2. CONCLUSION: Decreased levels of ET-1 and increased ETBR expression in the mesenteric circulation following CBDL in rats may underlie mesenteric vasodilation in individuals with PHT. Mechanistically, increased GRK2 expression may lead to desensitization of ETAR, as well as other vasoconstrictors, promoting this vasodilatory effect.展开更多
In order to investigate the expression of endothelin receptor B(ETR-B) in human malignant melanoma(MM) cells A375 and SK-mel-1 and the proliferative effects of endothelin 3(ET3) on A375 cells,RT-PCR was applied to det...In order to investigate the expression of endothelin receptor B(ETR-B) in human malignant melanoma(MM) cells A375 and SK-mel-1 and the proliferative effects of endothelin 3(ET3) on A375 cells,RT-PCR was applied to detect the expression of ETR-B gene in human MM cells A375 and SK-mel-1.MTT method was used to evaluate the growth enhancing effects of ET3 on A375 cell line in vitro.The results showed that ETR-B gene was expressed in both MM A375 and SK-mel-1 cells.ET3 had stronger ability to enhance the proliferation of A375 cells in vitro in a concentration-dependent manner.It was suggested that ET3/ETR-B might play an important proliferative role in MM.展开更多
Objective To investigate the mutation of endothelin receptor B (EDNRB) gene and endothelin 3 (EDN 3) gene in sporadic Hirschsprungs disease (HD) in Chinese population. Methods Genomic DNA was extracted from bowel ti...Objective To investigate the mutation of endothelin receptor B (EDNRB) gene and endothelin 3 (EDN 3) gene in sporadic Hirschsprungs disease (HD) in Chinese population. Methods Genomic DNA was extracted from bowel tissues of 34 unrelated HD patients which were removed by surgery. Exon 3, 4, 6 of EDNRB gene and Exon 1, 2 of EDN 3 gene were amplified by polymerase chain reaction (PCR) and analyzed by single strand conformation polymorphism (SSCP).Results EDNRB mutations were detected in 2 of the 13 short segment HDs. One mutant was in the exon 3; the other one was in the exon 6. EDN 3 mutation was detected in 1 of the 13 short segment HDs and in the exon 2. Both EDNRB mutation and EDN 3 mutation were detected in one short segment HD. No mutations were detected in the ordinary or long segment HD. Conclusion The mutations of EDNRB gene and EDN 3 gene are found in the short segment HD of sporadic Hirschsprung’s disease in Chinese population, which suggests that the EDNRB gene and EDN 3 gene play important roles in the pathogenesis of HD. the mutations of EDNRB and EDN 3 lead to the maldevelopment of the enteric nervous system.展开更多
The correlation between pulmonary endothelin receptors and alveolar-arterial oxygen gradient （A-aDO 2 ） in rats with hepatopulmonary syndrome was investigated. Animals were divided into 2 groups: Sham-operated （Sha...The correlation between pulmonary endothelin receptors and alveolar-arterial oxygen gradient （A-aDO 2 ） in rats with hepatopulmonary syndrome was investigated. Animals were divided into 2 groups: Sham-operated （Sham） group and common bile duct ligation （CBDL） group. Arterial blood gas was evaluated by a blood gas analyzer. The concentrations of ET-1 in blood and lung tissue sample were evaluated by radioimmunoassay. The distribution and expression of two kinds of subtype receptor of ET-1, ETRA and ETRB were examined by in situ hybridization. The results showed that the level of A-aDO 2 was higher in CBDL group than that in Sham group （P<0.05）. The levels of plasma and pulmonary ET-1 in CBDL group were both higher than in Sham group （P<0.05）. There was no significant difference in average A of ETRA between two groups by imaging analysis （0.21±0.06 vs 0.22±0.08, P>0.05）, while that of ETRB was higher in CBDL group than in Sham group （0.58±0.16 vs 0.28±0.07, P<0.05）. The expression of ETRB in lung was positively correlated with A-aDO2 （P<0.05）. It was concluded that the widened A-aDO 2 may be related with enhancement of the expression of ETRB in lung.展开更多
EDNRB/EDN3/ECE-1信号传导通路在胚胎发育期神经嵴细胞分化、迁移、发育为神经节细胞的过程中起到关键作用.内皮素B受体(endothelin receptor type B,EDNRB)基因突变导致该信号传导通路异常,神经嵴细胞迁移停顿,远端结直肠肌层间和黏膜...EDNRB/EDN3/ECE-1信号传导通路在胚胎发育期神经嵴细胞分化、迁移、发育为神经节细胞的过程中起到关键作用.内皮素B受体(endothelin receptor type B,EDNRB)基因突变导致该信号传导通路异常,神经嵴细胞迁移停顿,远端结直肠肌层间和黏膜下神经丛神经节细胞缺如而发生先天性巨结肠.展开更多
基金Supported by Grant from National Key New Drug Creation Project of China, No. 2009ZX09102
文摘AIM: To elucidate the mechanisms of mesenteric vasodilation in portal hypertension (PHT), with a focus on endothelin signaling. METHODS: PHT was induced in rats by common bile duct ligation (CBDL). Portal pressure (PP) was measured directly via catheters placed in the portal vein tract. The level of endothelin-1 (ET-1) in the mesenteric circulation was determined by radioimmunoassay, and the expression of the endothelin A receptor (ETAR) and endothelin B receptor (ETBR) was assessed by immunofluorescence and Western blot. Additionally, expression of G protein coupled kinase-2 (GRK2) and β-arrestin 2, which influence endothelin receptor sensitivity, were also studied by Western blot. RESULTS: PP of CBDL rats increased significantly (11.89 ± 1.38 mmHg vs 16.34 ± 1.63 mmHg). ET-1 expression decreased in the mesenteric circulation 2 and 4 wk after CBDL. ET-1 levels in the systemic circulation of CBDL rats were increased at 2 wk and decreased at 4 wk. There was no change in ETAR expression in response to CBDL; however, increased expression of ETBR in the endothelial cells of mesenteric arterioles and capillaries was observed. In sham-operated rats, ETBR was mainly expressed in the CD31+ endothelial cells of the arterioles. With development of PHT, in addition to the endothelial cells, ETBR expression was noticeably detectable in the SMA+ smooth muscle cells of arterioles and in the CD31+ capillaries. Following CBDL, increased expression of GRK2 was also found in mesenteric tissue, though there was no change in the level of β-arrestin 2. CONCLUSION: Decreased levels of ET-1 and increased ETBR expression in the mesenteric circulation following CBDL in rats may underlie mesenteric vasodilation in individuals with PHT. Mechanistically, increased GRK2 expression may lead to desensitization of ETAR, as well as other vasoconstrictors, promoting this vasodilatory effect.
基金This project was supported by a grant from National Natural Sciences Foundation of China (No 30671891)
文摘In order to investigate the expression of endothelin receptor B(ETR-B) in human malignant melanoma(MM) cells A375 and SK-mel-1 and the proliferative effects of endothelin 3(ET3) on A375 cells,RT-PCR was applied to detect the expression of ETR-B gene in human MM cells A375 and SK-mel-1.MTT method was used to evaluate the growth enhancing effects of ET3 on A375 cell line in vitro.The results showed that ETR-B gene was expressed in both MM A375 and SK-mel-1 cells.ET3 had stronger ability to enhance the proliferation of A375 cells in vitro in a concentration-dependent manner.It was suggested that ET3/ETR-B might play an important proliferative role in MM.
基金ThisresearchwassupportedbytheNaturalScienceFoundationofShaanxiProvince (No .2 0 0 0SM 58)
文摘Objective To investigate the mutation of endothelin receptor B (EDNRB) gene and endothelin 3 (EDN 3) gene in sporadic Hirschsprungs disease (HD) in Chinese population. Methods Genomic DNA was extracted from bowel tissues of 34 unrelated HD patients which were removed by surgery. Exon 3, 4, 6 of EDNRB gene and Exon 1, 2 of EDN 3 gene were amplified by polymerase chain reaction (PCR) and analyzed by single strand conformation polymorphism (SSCP).Results EDNRB mutations were detected in 2 of the 13 short segment HDs. One mutant was in the exon 3; the other one was in the exon 6. EDN 3 mutation was detected in 1 of the 13 short segment HDs and in the exon 2. Both EDNRB mutation and EDN 3 mutation were detected in one short segment HD. No mutations were detected in the ordinary or long segment HD. Conclusion The mutations of EDNRB gene and EDN 3 gene are found in the short segment HD of sporadic Hirschsprung’s disease in Chinese population, which suggests that the EDNRB gene and EDN 3 gene play important roles in the pathogenesis of HD. the mutations of EDNRB and EDN 3 lead to the maldevelopment of the enteric nervous system.
文摘The correlation between pulmonary endothelin receptors and alveolar-arterial oxygen gradient （A-aDO 2 ） in rats with hepatopulmonary syndrome was investigated. Animals were divided into 2 groups: Sham-operated （Sham） group and common bile duct ligation （CBDL） group. Arterial blood gas was evaluated by a blood gas analyzer. The concentrations of ET-1 in blood and lung tissue sample were evaluated by radioimmunoassay. The distribution and expression of two kinds of subtype receptor of ET-1, ETRA and ETRB were examined by in situ hybridization. The results showed that the level of A-aDO 2 was higher in CBDL group than that in Sham group （P<0.05）. The levels of plasma and pulmonary ET-1 in CBDL group were both higher than in Sham group （P<0.05）. There was no significant difference in average A of ETRA between two groups by imaging analysis （0.21±0.06 vs 0.22±0.08, P>0.05）, while that of ETRB was higher in CBDL group than in Sham group （0.58±0.16 vs 0.28±0.07, P<0.05）. The expression of ETRB in lung was positively correlated with A-aDO2 （P<0.05）. It was concluded that the widened A-aDO 2 may be related with enhancement of the expression of ETRB in lung.
文摘EDNRB/EDN3/ECE-1信号传导通路在胚胎发育期神经嵴细胞分化、迁移、发育为神经节细胞的过程中起到关键作用.内皮素B受体(endothelin receptor type B,EDNRB)基因突变导致该信号传导通路异常,神经嵴细胞迁移停顿,远端结直肠肌层间和黏膜下神经丛神经节细胞缺如而发生先天性巨结肠.
