Low dose ultraviolet B-irradiated Langerhans cells preferentially activate CD4+ cells of the T helper 2 subset

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Journal of Immunology; (USA)

OSTI ID:6509381

Simon, J C; Cruz, Jr, P D; Bergstresser, P R; Tigelaar, R E ^[1]

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1. Univ. of Texas Southwestern Medical Center, Dallas (USA)

UVB radiation distorts the Ag-presenting function of epidermal Langerhans cells (LC); this has been shown for the presentation of soluble Ag to primed T cells in vitro and for the initiation of delayed-type hypersensitivity in vivo, such as contact hypersensitivity (CH). Previous work has also demonstrated UVB-induced suppression of CH to be mediated ultimately by T cells. Two subsets of CD4+ Th cells, Th1 and Th2, have been identified, based on their cytokine production and functional activities. In particular, Th1 mediate delayed-type hypersensitivity, whereas Th2 do not. To investigate whether the perturbation of LC function induced by UVB radiation leads to a differential activation of these subsets of CD4+ cells, we examined the capacity of unirradiated and irradiated (200 J/m2) APC from adult BALB/c mice to present keyhole limpet hemocyanin to Ag-specific, H2d-restricted Th1 and Th2 cell lines. Four sources of APC were utilized: epidermal cells (EC), flow microfluorometry-purified Ia+ EC (LC), flow microfluorometry-purified Ia- EC, and splenic adherent cells (SAC). Unirradiated EC, LC, and SAC, but not Ia-EC, presented keyhole limpet hemocyanin to both Th1 and Th2. Irradiated EC and LC lost their ability to stimulate Th1, but retained fully their capacity to stimulate Th2. On the other hand, irradiated SAC were unable to induce proliferation of either Th1 or Th2. These findings indicate that suppression of CH mediated by UVB-irradiated LC may result from an alteration of the ratio and/or activity of Th1 and Th2 cells normally generated during the induction of such responses.

• OSTI ID: 6509381
• Journal Information: Journal of Immunology; (USA), Journal Name: Journal of Immunology; (USA) Vol. 145:7; ISSN JOIMA; ISSN 0022-1767
• Country of Publication: United States
• Language: English

Related Subjects

560120* -- Radiation Effects on Biochemicals
Cells
& Tissue Culture
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
ANIMAL CELLS
BIOLOGICAL EFFECTS
BIOLOGICAL MATERIALS
BIOLOGICAL RADIATION EFFECTS
BIOSYNTHESIS
BLOOD
BLOOD CELLS
BODY
BODY FLUIDS
CELL FLOW SYSTEMS
CELL PROLIFERATION
CONNECTIVE TISSUE CELLS
DIGESTIVE SYSTEM
DOSE-RESPONSE RELATIONSHIPS
ELECTROMAGNETIC RADIATION
ENDOCRINE GLANDS
GLANDS
HEMOCYANIN
IRRADIATION
LEUKOCYTES
LOW DOSE IRRADIATION
LYMPHOCYTES
MATERIALS
METALLOPROTEINS
ORGANIC COMPOUNDS
ORGANS
PANCREAS
PROTEINS
RADIATION EFFECTS
RADIATIONS
SOMATIC CELLS
SYNTHESIS
ULTRAVIOLET RADIATION