Platelet Dysfunction in Chediak-Higashi Syndrome-Affected Cattle.

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概要

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• A serious symptom of cattle affected with Chediak-Higashi syndrome (CHS) is a bleeding tendency. This diathesis is characterized by insufficient platelet aggregation as a result of depressed response to collagen. One possible cause for the depression is a decrease in contribution of endogenous agonists such as ADP or thromboxane A2, which are released following collagen stimulation. However, these endogenous agonists play only a minor role in collagen-induced aggregation of bovine platelets. More importantly, activation of phospholipase C as a result of a direct action of collagen is depressed, leading to a depression of Ca2+ mobilization, in platelets from CHS-affected cattle. Several types of collagen receptor are proposed to work in concert to induce aggregation. Among them, glycoprotein VI (GPVI) and GPIa/IIa (integrin α2 β1) have been supposed to play dominant roles in collagen-induced aggregation. However, there are arguments about the role of each receptor, especially the role of GPIa/IIa, and the crosstalk between receptors. Recently, we reported that the Ca2+ signaling produced by rhodocytin, which had been first reported to be an agonist for the collagen receptor GPIa/IIa, produced much less Ca2+ signaling in CHS platelets than in normal ones, whereas that produced by GPVI activators was normal. These suggest that GPIa/IIa or the rhodocytin-associated pathway is impaired in CHS platelets. CHS platelets are valuable to reassess the mechanism of collagen-dependent signal transduction system and to delineate the inter-relationship among collagen receptors.

• 公益社団法人 日本獣医学会の論文

著者

• Ito Katsuaki

  Department Of Veterinary Pharmacology Faculty Of Agriculture Miyazaki University

• Ikeda Masahiro

  Department Of Cardiovascular Surgery Fukui Cardiovascular Center

• Ogawa Hiroyuki

  Graduate School Of Agricultural And Life Sciences The University Of Tokyo

• Shiraishi Mitsuya

  Department Of Veterinary Medicine Kagoshima University Graduate School Of Agriculture

• Kawashima Sachiko

  Department Of Endocrinology And Metabolism National Hospital Organization Kyoto Medical Center

• KAWASHIMA Sachiko

  Department of Veterinary Pharmacology, Faculty of Agriculture, Miyazaki University

• ITO Katsuaki

  Department of Pharmacology, School of Veterinary Medicine, Azabu University

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