1995 Fiscal Year Final Research Report Summary
Research for inhibitory mechanisms on eosinophil functions
| Project/Area Number |
05454256
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| Research Category |
Grant-in-Aid for General Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Respiratory organ internal medicine
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| Research Institution | The Department of Internal Medicine, Toho University, School of Medicine, Sakura Hospital |
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Principal Investigator |
TOMIOKA Hisao Toho University, School of Medicine, Sakura Hospital, The Department of Internal Medicine, Professor, 医学部付属佐倉病院内科, 教授 (20009632)
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| Co-Investigator(Kenkyū-buntansha) |
OCHIAI Ken-ichi Toho University, School of Medicine, Sakura Hospital, The Department of Internal, 医学部付属佐倉病院内科, 研究生
MATSUMURA Ryutaro Toho University, School of Medicine, Sakura Hospital, The Department of Internal, 医学部付属佐倉病院内科, 助手 (70246742)
KAGAMI Masaru Toho University, School of Medicine, Sakura Hospital, The Department of Internal, 医学部付属佐倉病院内科, 助手 (50233656)
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| Project Period (FY) |
1993 – 1995
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| Keywords | Eosinophils / Cell differentiation / IL-4 / IL-5 / IFN-gamma / Apoptosis / Protooncogene / Antisense |
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| Research Abstract |
1. In order to determine the regulatory mechanisms of eosinophil differentiation, we examined the effects of interleukin-4 (IL-4) and interferon-gamma (IFN-gamma) on the IL-3-and IL-5-induced eosinophils from cord blood mononuclear cells. (1) rhIL-4and rhlFN-gamma inhibited IL-3-and IL-5-induced eosinophil differentiation from umbilical cord blood mononuclear cells on day 28 of culture in a concentration-dependent manner, (2) The inhibitory effect of rhIL-4 and rhIFN-gamma was observed only when rhIL-4 or rhIFN-gamma was present in the culture from day 0 to day 14, (3) Addition of anti-rhIL-4 to the culture enhanced the IL-3-and IL-5-induced eosinophils differentiation. These results indicate that IL-4 and IFN-gamma have inhibitory effects on IL-3-and IL-5-induced eosinophils differentiation from its progenitor cells.
2. In order to determine regulatory mechanisms of eosinophil apoptosis, we examined the effect of IL-5 and IFN-gamma on eosinophil apoptosis and bcl-2 expression. (1) rhIL-5 (250pg/ml) significantly inhibited eosinophil apoptosis on 96 hr in vitro culture, (2) rhIL-5 significantly increased bcl-2 protein and mRNA expression on cultured eosinophils, (3) A phosphorothioate antisense oligonucleotide targeted the ATG translation initiation codon of bcl-2 (10-^5M) could significantly block the supportive effect of rhIL-5 (250pg/ml) for eosinophil survial compared with sense cDNA of bcl-2 on 96 hr culture, (4) On the contrary, rhIFN-gamma (1000U/ml) significantly inhibited eosinophils apoprosis on 96 hrin vitro culture but did not significantly upregulate bcl-2 protein.
These results indicate that IL-5 have inhibitory effects on eosinophil apoptosis by regulation of bcl-2 expression.
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Research Products
(2 results)
