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J. Exp. Med., Volume 187, Number 12, June 15, 1998 2045-2053

Dermal Mast Cells Determine Susceptibility to Ultraviolet B-induced Systemic Suppression of Contact Hypersensitivity Responses in Mice

By Prue H. Hart,* Michele A. Grimbaldeston,* Georgina J. Swift,* Aleksandra Jaksic,* Frances P. Noonan,Dagger and John J. Finlay-Jones*

From the * Department of Microbiology and Infectious Diseases, School of Medicine, Flinders University of South Australia, Adelaide, Australia 5001; and the Dagger  Department of Dermatology, The George Washington University, Washington, District of Columbia 20037

Different strains of mice have varying susceptibilities to ultraviolet radiation (UV) of wavelength 280-320 nm (UVB) for 50% suppression of systemic contact hypersensitivity (CHS) responses. Prevalence of histamine-staining dermal mast cells in different strains of mice (C57BL/ 6J, DBA/2, BALB/c) correlated directly with their susceptibility to UVB-induced systemic immunosuppression. BALB/c mice carrying Uvs1, a major locus for susceptibility to UV-induced immunosuppression, contained greater numbers of dermal mast cells than BALB/c mice of the same parental origin. Strains of mice that were differentiated on their susceptibility to UVB-induced downregulation of systemic CHS responses were similar in their susceptibility to histamine-induced immunomodulation. Histamine, but not UVB irradiation, decreased systemic CHS responses in mast cell-depleted mice (W  f/W  f). Reconstitution of the dorsal skin of W  f/W  f mice with bone marrow-derived mast cell precursors from nonmutant mice rendered the mice susceptible to UVB irradiation for systemic suppression of CHS responses. UVB irradiation did not suppress delayed type hypersensitivity responses to allogeneic spleen cells in W  f/W  f mice. In contrast, UV irradiation suppressed CHS responses in W  f/W  f mice when hapten was applied to the irradiated site. This study demonstrates that dermal mast cells are necessary for the induction of systemic suppression of CHS responses by UVB radiation, and suggests that mast cell- derived histamine is one component of this UVB-induced systemic immunosuppression.

Key words: rodent;  skin;  mast cells;  ultraviolet B radiation;  systemic immunosuppression


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