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Effects of octreotide on expression of L-type voltage-operated calcium channels and on intracellular Ca2+ in activated hepatic stellate cells

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单位: [1]Capital Univ Med Sci, Dept GI & Hepatol, Beijing You An Hosp, Beijing 100054, Peoples R China [2]Capital Univ Med Sci, Beijing Friendship Hosp, Liver Study Ctr, Beijing 100050, Peoples R China [3]Univ Hong Kong, Queen Mary Hosp, Dept Med, Hong Kong, Hong Kong, Peoples R China
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关键词: octreotide hepatic stellate cell intracellular Ca2+ L-VOCC portal hypertension endothelin-1 LSCM immunocytochemistry

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Background The contractility of hepatic stellate cells ( HSCs) may play an important role in the pathogenesis of cirrhosis with portal hypertension. The aim of this study was to research the effects of octreotide, an analogue of somatostatin, on intracellular Ca2+ and on the expression of L-type voltage-operated calcium channels (L-VOCCs) in activated HSCs, and to try to survey the use of octreotide in treatment and prevention of cirrhosis with portal hypertension complications. Methods HSC-T-6, an activated HSCs line, was plated on small glass coverslips in 35-mm culture dishes at a density of 1 X 10(5)/ml, and incubated in DMEM media for 24 hours. After the cells were loaded with Fluo-3/AM, intracellular Ca2+ was measured by Laser Scanning Confocal Microscopy (LSCM). The dynamic changes in activated HSCs of intracellular Ca2+, stimulated by octreotide, endothelin-1, and KCl, respectively, were also determined by LSCM. Each experiment was repeated six times. L-VOCC expression in HSCs was estimated by immunocytochemistry. Results After octreotide stimulation, a signifcant decrease in the intracellular Ca2+ of activated HSCs was observed. However, octreotide did not inhibit the increases in intracellular Ca2+ after stimulation by KCI and endothelin-1. Moreover, octreotide did not significantly affect L-VOCC expression. These results suggest that neither L-VOCC nor endothelin-1 receptors in activated HSCs are inhibited by octreotide. Conclusions Octreotide may decrease portal hypertension and intrahepatic vascular tension by inhibiting activated HSCs contractility through decreases in intracellular Ca2+. The somatostatin receptors in activated HSCs may be inhibited by octreotide.

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大类 | 2 区 医学
小类 | 2 区 医学:内科
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出版当年[2002]版:
Q4 MEDICINE, GENERAL & INTERNAL
最新[2023]版:
Q1 MEDICINE, GENERAL & INTERNAL

影响因子: 最新[2023版] 最新五年平均[2021-2025] 出版当年[2002版] 出版当年五年平均[1998-2002] 出版前一年[2001版] 出版后一年[2003版]

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第一作者单位: [1]Capital Univ Med Sci, Dept GI & Hepatol, Beijing You An Hosp, Beijing 100054, Peoples R China
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