Abstract:Narrow band (311 nm) UVB phototherapy is established treatment for psoriasis. DNA is a target for UVB via formation of cyclobutane pyrimidine dimers, which trigger loss of dendritic cells and macrophages, and inhibit CD4+ and CD8+ T cells. UV causes the formation of thymine dimers, which activate nuclear enzyme poly(ADP-ribose) polymerase. The fact that poly(ADP-ribose) polymerase utilizes nicotinamide-adenine dinucleotide (NAD) explains NAD decreases after UV irradiation. NADH regulates transcriptional repres… Show more
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