当前位置： SCI文献检索 > JOURNAL OF DERMATOLOGICAL SCIENCE期刊下所有文献 > Cyclophosphamide decreases the number, percentage and the function of CD25+ CD4+ regulatory T cells, which suppress induction of contact hypersensitivity.

Cyclophosphamide decreases the number, percentage and the function of CD25+ CD4+ regulatory T cells, which suppress induction of contact hypersensitivity.

Abstract：

BACKGROUND:It is well known that cyclophosphamide (Cy) treatment before sensitization paradoxically enhances rather than suppresses contact hypersensitivity (CH) reactions. In fact, Cy-treated mice developed a significant (p < 0.05) increase of the CH reactions to 2,4,6-trinitro-1-chrolobenzene (TNCB) in comparison with untreated mice. OBJECTIVE:In order to examine whether the target cells of Cy in the immuno-augmentative effect are CD25(+) CD4(+) regulatory T cells or not, we investigated effect of Cy treatment on CD25(+) CD4(+) T cells. METHOD:We examined Cy-treated CD25(+) CD4(+) T cells by flow cytometer and by inhibition assay on proliferation of CD25(-) CD4(+) T cells. RESULTS:Cy treatment remarkably reduced the number and percentage of CD25(+) CD4(+) T cells in the spleen and lymph nodes 3 and 5 days later. Moreover, CD25(+) CD4(+) T cells taken from the Cy-treated mice 3 days later showed the lower suppressive activity on proliferation of CD25(-) CD4(+) T cells, as compared to that from the untreated mice. Furthermore, transfer of CD25(+) CD4(+) T cells from untreated mice resulted in a significant decrease (p < 0.05) of the CH reactions enhanced by Cy treatment. CONCLUSION:These results indicate that enhancement of the CH reactions to TNCB by Cy treatment is attributed to the decrease in the number, percentage and the function of CD25(+) CD4(+) regulatory T cells.

journal_name

J Dermatol Sci

journal_title

Journal of dermatological science

authors

Ikezawa Y,Nakazawa M,Tamura C,Takahashi K,Minami M,Ikezawa Z

doi

10.1016/j.jdermsci.2005.02.002

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

105-12

issue

2

eissn

0923-1811

issn

1873-569X

pii

S0923-1811(05)00076-9

journal_volume

39

pub_type

杂志文章

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