Interactions between maturing T lymphocytes and the thymic microenvironment are critical for the development of functionally mature T lymphocytes. Aberrant T cell maturation can result in immunodeficiency, autoimmunity and T cell leukemias and lymphomas. The epidermis has been implicated as another tissue that might serve as an inductive environment for maturing T lymphocytes and many similarities between epidermis and thymic epithelial cells have been documented. The general goal of this proposal is to evaluate epidermal - T lymphocyte interactions. The ability of epidermal keratinocytes (EK) to serve as accessory cells for T lymphocytes including resting T cells, activated T cells and T cell clones will be investigated. If EK serve as accessory cells or antigen presenting cells, particularly to activated T cells then EK may play a significant role in vivo in amplifying an ongoing immune response and particularly in chronic inflammatory responses. The ability of EK to bind to and stimulate proliferation of immature cells of the T lymphocyte lineage will be examined using T cell-epithelial binding assays and standard assays of T cell proliferation. The results of these studies should provide information regarding the ability of epidermis to serve as a site of extrathymic T cell maturation in normal and aberrant situations. The state of T cell maturation and expression of T cell receptor genes in T cells that home to the skin in inflammatory skin disease and cutaneous T cell malignancies will be determined using immunofluorescence, in situ hybridization and Northern blot techniques to identify mRNA transcripts from T cell receptor genes (alpha, beta, gamma). The effects of T lymphocytes on epidermal cells will be investigated. These studies will include T cell regulation of IL 1 production by epidermal cells as well as T cell-mediated regulation of cell surface markers (HLA-DR, ICAM-1) on epidermal cells. The effects of T cell derived IL 2 on epidermal cell proliferation will be investigated. A cytotoxic anti-fibroblast and macrophage antibody produced in the original funding period will be characterized including biochemical identification of target molecules and possible inhibition of functional assays.

Agency
National Institute of Health (NIH)
Institute
National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS)
Type
Research Project (R01)
Project #
7R01AR034808-08
Application #
2078993
Study Section
General Medicine A Subcommittee 2 (GMA)
Project Start
1988-02-01
Project End
1995-01-31
Budget Start
1992-03-13
Budget End
1995-01-31
Support Year
8
Fiscal Year
1992
Total Cost
Indirect Cost
Name
Loyola University Chicago
Department
Anatomy/Cell Biology
Type
Schools of Medicine
DUNS #
791277940
City
Maywood
State
IL
Country
United States
Zip Code
60153
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Le, P T; Vollger, L W; Haynes, B F et al. (1990) Ligand binding to the LFA-3 cell adhesion molecule induces IL-1 production by human thymic epithelial cells. J Immunol 144:4541-7
Le, P T; Lazorick, S; Whichard, L P et al. (1990) Human thymic epithelial cells produce IL-6, granulocyte-monocyte-CSF, and leukemia inhibitory factor. J Immunol 145:3310-5
Singer, K H (1990) Interactions between epithelial cells and T lymphocytes: role of adhesion molecules. J Leukoc Biol 48:367-74

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