Ligands for β1 and β2 integrins are induced in ultraviolet-exposed human skin and upregulate monocytic/macrophagic cell IL-10, but downregulate IL-12 production

Kang, Kefei; Yoshida, Yasuhiko; Chen, G; Gilliam, AC; Hammerberg, Craig; Cooper, K. D.

doi:10.1016/s0923-1811(98)83106-x

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“…This hypothesis is supported by recent publications that demonstrate cross-linking the CD11b/CD18 molecule downregulates induction of interleukin-12 by monocytes (37,38). Furthermore, we have recently found that iC3b is capable of inducing IL-10 in human monocytes (39).…”

Section: Discussionsupporting

confidence: 83%

Activated Complement Component 3 (C3) Is Required for Ultraviolet Induction of Immunosuppression and Antigenic Tolerance

Hammerberg

Katiyar

Carroll

et al. 1998

The Journal of Experimental Medicine

108

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Complement component 3 (C3), a critical regulator of innate immunity, may also play a role in the regulation of cognate immunity, such as contact sensitivity responses. Because ultraviolet (UV) radiation also activates C3 in the skin, we determined whether the immunosuppressed state that results when a contact sensitizer is applied through UVB-exposed skin requires the presence and activation of C3. This question was addressed through the use of C3-deficient mice, blockade of C3 cleavage to C3b, and accelerated degradation of iC3b by soluble complement receptor 1 (sCR1). Both C3-modulated systems totally reversed the failure to induce a contact sensitivity response to dinitrofluorobenzene (DNFB) upon primary sensitization at the UV-exposed site, as well as immunologic tolerance to a second DNFB immunization through normal skin. Treatment with sCR1 reduced the infiltration of CD11b+ leukocytes into the epidermis and dermis of UV-irradiated skin but did not reverse the UV-induced depletion of epidermal class II MHC+CD11blo Langerhans cells. These data, taken together with previous results showing abrogation of locally induced UV immunosuppression by in vivo anti-CD11b treatment, suggest a novel mechanism by which ligation of the leukocyte β2 integrin, CD11b, by iC3b molecules formed from C3 activation in UV-exposed skin, modifies cutaneous CD11b+ cells such that skin antigen-presenting cells are unable to sensitize in a primary immune response, but actively induce antigenic tolerance.

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Section: Discussionsupporting

confidence: 83%