急性炎症病態におけるカルシウム非依存性ホスホリパーゼA2の役割
Phospholipase A2 (PLA2) is an essential enzyme regulating inflammatory processes. However, the relationship between calcium-independent PLA2 and acute inflammation remains unclear. The cytotoxicity of mesenteric lymph is one of the pathogenic mechanisms of multiple organ failure following hemorrhagi...
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Published in | Journal of the Japanese Association for the Surgery of Trauma Vol. 30; no. 2; pp. 47 - 55 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Language | Japanese |
Published |
一般社団法人 日本外傷学会
2016
The Japanese Association for the Surgery of Trauma |
Subjects | |
Online Access | Get full text |
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Summary: | Phospholipase A2 (PLA2) is an essential enzyme regulating inflammatory processes. However, the relationship between calcium-independent PLA2 and acute inflammation remains unclear. The cytotoxicity of mesenteric lymph is one of the pathogenic mechanisms of multiple organ failure following hemorrhagic shock. We have identified biologically active lysophospholipids with unsaturated fatty acids that are elaborated through the activation of iPLA2γ. In addition, we have demonstrated that iPLA2γ may be involved in multiple PMN cytotoxic functions (respiratory burst, degranulation, chemotaxis, adherence, and surface expression of adhesion molecules) as well as the adherence cascade in the mesenteric microcirculation. Taken together, it is likely that the iPLA2γ enzyme plays crucial roles in acute inflammatory conditions.
ホスホリパーゼA2 (PLA2) は急性炎症を制御する重要な酵素である. しかしながら, カルシウム非依存性PLA2 (iPLA2) と炎症との関連性は十分に検討されていない. 腸間膜リンパ液は出血性ショックに続発する多臓器障害の発症機序の一つである. 我々は, 腸間膜リンパ液中に生物活性を有する不飽和脂肪酸含有リゾリン脂質を同定し, iPLA2γがこれらの脂質メディエータの産生を制御することを明らかにした. また, iPLA2γは急性炎症の過程で中心的に機能する好中球の生物活性 (活性酸素産生, 脱顆粒, 走化能, 接着能, 接着分子発現) の発現や腸間膜微小循環における白血球と血管内皮細胞の接着にも関与することを証明した. このように, iPLA2γは急性炎症の病態に不可欠な酵素であるかもしれない. |
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ISSN: | 1340-6264 2188-0190 |
DOI: | 10.11382/jjast.30.47 |