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Title
IL-7 Is a Critical Factor in Modulating Lesion Development in Skn-Directed Autoimmunity |
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Author
Staton, Pamela J; Carpenter, ABetts; Jackman, Susan H |
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Author Affiliation
Departments of Microbiology, Immunology, and Molecular Genetics and Department of Pathology, Joan C. Edwards School of Medicine, Marshall University, Huntington, WV 25704 |
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Source
Journal of Immunology [J. Immunol.]. Vol. 176, no. 7, pp. 3978-3986. 1 Apr 2006. |
IS: |
ISSN
0022-1767 |
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Descriptors
Interleukin 7; Spleen; CD4 antigen; Autoimmunity; Lymphocytes T; Development; Adoptive transfer; Immunoregulation; Skin diseases; CD8 antigen; Animal models |
AB: |
Abstract
In a murine model of autoimmunity targeted against the epidermal cell Ags, Skn, adoptive transfer of Skn-immune T cells to immunosuppressed recipients elicits skin lesions in areas of mild epidermal trauma. In this study, we examined peripheral regulation of Skn-induced autoreactivity disrupted by rendering the mice immunoincompetent. We found that regulation of Skn-directed autoimmunity was restored by cotransfer of normal syngeneic spleen cells at twice the concentration of Skn-immune cells and was evidenced by significantly reduced lesion severity by days 5-7 post-cotransfer compared with animals given injections of Skn-immune cells alone. Enrichment and depletion of normal CD4 super(+) or CD8 super(+) spleen cells and RT-PCR analysis of selected cytokines identified CD4 super(+) cells as the regulatory cells in the cotransfer inoculum; however, significant reduction in lesion severity was observed only when there was a concomitant increase in levels of IL-7. The role of IL-7 was further supported in that mice cotransferred with Skn-immune cells plus normal spleen cells, but also treated with anti-IL-7 Ab, no longer exhibited reduced lesion severity. To determine whether IL-7 expression without normal spleen cell cotransfer could modulate lesion development, an IL-7-encoding plasmid (pCMV-Tag1-IL-7) was topically delivered to sites flanking the stressed skin site in Skn-induced autoimmune mice. Daily application of 15 mu g of pCMV-Tag1-IL-7 significantly suppressed lesion severity. Our results support a mechanism for CD4 super(+) T cells and IL-7 in contributing to the control of autoreactivity. |
LA: |
Language
English |
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Summary Language
English |
PY: |
Publication Year
2006 |
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Publication Type
Journal Article |
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Publisher
American Association of Immunologists, 9650 Rockville Pike Bethesda MD 20814-3998 USA, http://www.jimmunol.org/ |
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Classification
F 06360 Skin: Animal |
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Update
200604 |
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Subfile
Immunology Abstracts |
AN: |
Accession Number
6748692 |
PG: |
Journal Pages
3978-3986 |
JV: |
Journal Volume
176 |
JI: |
Journal Issue
7 |