Journal of Okayama Medical Association
Published by Okayama Medical Association

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IgGレセプターを介する好塩基球の活性化機構に関する研究

河田 典子 岡山大学医学部第二内科学教室
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抄録
To clarify the mechanism of human basophil activation via IgG receptors, calcium mobiliza-tion in response to IgG antibodies was analyzed in the human basophilic leukemia cell line KU812-F, using flow cytometry. KU812-F cells as well human basophils selectively expres-sed the FcγRⅡ subtype of IgG receptor. After stimulation with aggregated IgG, an obvious increase in [Ca(2+)]i was observed, but the increase was completely inhibited by Ⅳ. 3 (antiFcγRⅡmAb). Moreover, Ⅳ. 3 elicited a[Ca(2+)]i rise only when cross-linked on the cell surface with anti-mouse IgG. No significant histamine release was observed after any IgG stimulation and the biologic function of the FcγRⅡ-induced [Ca(2+)]i rise remains unclar. These findings suggest that the cross-linking of FcγRⅡ in KU812-F cells induces signal transduction events and initiates cell activation with the exception of histamine release, and human basophils also may be activated in vivo by IgG antibodies.
キーワード
KU812-F
Basophil
Ca(2+) response
FcγRⅡ
IgG antibody
備考
原著
ISSN
0030-1558
NCID
AN00032489