The present family investigation has shown that genes within the MHS are mainly responsible for the development of psoriasis or psoriasis-associated arthritic lesions (peripheral arthritis and sacroiliitis).
The frequency of HLA-A, B, and Cw antigens as well as the antigens expressed preferentially on B cells and monocytes (DRw and Ia-like) was examined in a normal population and two related disease populations, psoriasis and psoriatic arthritis.
Blood was cultured and chromosome preparations were examined for sister chromatid exchanges and chromosome aberrations in eighteen patients receiving photochemotherapy with 8-MOP and UV-A for the treatment of psoriasis, both before starting treatment and again 6 months later.
Blood was cultured and chromosome preparations were examined for sister chromatid exchanges and chromosome aberrations in eighteen patients receiving photochemotherapy with 8-MOP and UV-A for the treatment of psoriasis, both before starting treatment and again 6 months later.
Blood was cultured and chromosome preparations were examined for sister chromatid exchanges and chromosome aberrations in eighteen patients receiving photochemotherapy with 8-MOP and UV-A for the treatment of psoriasis, both before starting treatment and again 6 months later.
By comparisons of empirical risk figures for psoriasis in first-degree relatives of concordant as compared with discordant MZ probands and HLA-B 13 and/or HLA-B 17 positive MZ probands compared with MZ probands lacking these antigens, no clue to the presence of genetic heterogeneity was found.
Since MZ heterozygotes are almost always, and MS phenotypes sometimes, associated with decreased serum alpha 1-AT levels, and since Z and MZ phenotypes are associated with increased hepatic fibrosis or cirrhosis, these variants may be relevant to problems of spontaneous fibrosis or methotrexate-induced hepatotoxicity in psoriasis. alpha 1-AT deficiency may also contribute to guttate flares with infection and to increased O-2 . production by psoriatic sera-stimulated polymorphonuclear leukocytes (PMNs).
A hypothesis for the role of substance P that would account for the temporal onset with stress, the clinical symmetry of lesions, and the histopathologic features of psoriasis is presented.