Retinoids and Phototherapy for Psoriasis

医学 银屑病 皮肤病科 药理学 纳米载体 维甲酸 阿维A 药品 维甲酸 生物化学 化学 基因
作者
Giuseppe Monfrecola,Alberto Guinand Baldo
出处
期刊:The Journal of Rheumatology Supplement [The Journal of Rheumatology]
卷期号:83: 71-72 被引量:7
标识
DOI:10.3899/jrheum.090231
摘要

Retinoids are the most widely used agents for systemic treatment of psoriasis; as structural and functional analogs of vitamin A, they are involved in the regulation of several biologic functions. Acitretin is the oral retinoid currently used, alone or in combination with other treatments, for plaque type, erythrodermic, and pustular psoriasis. Due to its high teratogenic effect, therapeutic contraception is required for women taking the drug. Narrowband ultraviolet B (nbUVB, 311 +/- 2 nm) is effective for guttate and plaque-type psoriasis. At the molecular level, UV light acts (1) directly (type I reaction) inducing the formation of pyrimidine dimers that, in turn, cause a transient cellular growth arrest; and (2) indirectly (type II reaction) through the generation of reactive oxygen species that act on key molecules such as lipids (in particular lipid membranes), proteins, and nucleic acids. Several studies show that UV rays can cause a transient decrease in DNA, RNA, and protein synthesis. These events are accompanied by a temporary normalization of cell kinetics of psoriatic keratinocytes. Phototherapy is carried out 3 times a week alone or in combination with topical treatments and/or acitretin. Several studies have confirmed that oral retinoids together with nbUVB (ReUVB) reduce the recovery time and also the doses of both acitretin and nbUVB. The regimen is carried out treating the patient with acitretin alone (0.5 mg/kg bw) for 2 weeks, then the dose of acitretin is reduced to 0.3 mg/kg bw, and the nbUVB is added 3 times a week until complete resolution of disease. As retinoids exert an anticarcinogenic effect, the ReUVB regimen could lower skin cancer risk resulting from longterm UVB therapy.
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