The Role of Thunberginol A, an Isocoumarin Constituent of Hydrangeae Dulcis Folium, on the Signal Transmission Pathway for Rat Mast Cell Degranulation
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概要
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The role of the signal transmission pathway of thunberginol A (TA) in mast cell degranulation was examined using rat peritoneal mast cells. First of all, we investigated the cellular distribution of TA using fluoroscent microscopy. This indicated that TA is immediately incorporated into cells and distributes in cytosol around the nucleus. We then investigated the effect of TA on mast cell protein tyrosine phosphorylation, which is part of the signal transduction cascade for degranulation. TA non-specifically inhibited the tryosine phosphorylation in duced by compound 48/80 (Co. 48/80), at 10 to 100 μM, and orthovanadate/hydrogen peroxide at more than 50 μM in a dose-dependent manner. As far as the intracellular Ca^<2+> change in fluo-3-loaded cells was concerned, TA (10 μM) suppressed the rise in Ca^<2+> induced by antigens, ionomycin and thapsigargin, while TA did not suppress the rise induced by Co. 48/80. This evidence suggests that TA mainly inhibits extracellular Ca^<2+> influx, but TA does not act on the intracellular Ca^<2+> mobilization from the endoplasmic reticulum. We also investigated the influence of TA on the cytoskeleton and membrane changes using mast cells and erythrocytes. TA (10 μM) inhibited the cytoskeletal assembly formation in dicyanovinyl julolidin-loaded mast cells induced by Co. 48/80. Moreover, TA suppressed the hypotonic hemolysis of erythrocytes, from 3 to 1000 μM, in a dose-dependent manner. These results suggest that inhibition of protein tyrosine phosphorylation, extracellular Ca^<2+> influx and cytoskeletal assembly formation, and membrane stabilization are involved in the inhibitory effect of TA in mast cell degranulation.
- 社団法人日本薬学会の論文
- 1999-09-15
著者
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MATSUDA Hisashi
Kyoto Pharmaceutical University
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YOSHIKAWA Masayuki
Kyoto Pharmaceutical University
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Harima S
Kyoto Pharmaceutical Univ. Kyoto Jpn
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SHIMODA Hiroshi
Kyoto Pharmaceutical University
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KAGEURA Tadashi
Kyoto Pharmaceutical University
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Harima Shoichi
京都薬科大学
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Harima Shoichi
Kyoto Pharmaceutical University:department Of Traditional Chinese Medicine Shenyang Pharmaceutical U
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Shimada Hideyo
Division Of Pathophysiology School Of Pharmaceutical Sciences Kitasato University
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Yamazaki M
School Of Pharmaceutical Sciences Kinki University
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Kageura Tadashi
Department Of Pathological Biochemistry Kyoto Pharmceutical University
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MATSUDA HISASHI
Kyoto College of Pharmacy
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