PUVA treatment selectively induces a cell cycle block and subsequent apoptosis in human T-lymphocytes

被引:77
作者
Johnson, R
StaianoCoico, L
Austin, L
Cardinale, I
NabeyaTsukifuji, R
Krueger, JG
机构
[1] ROCKEFELLER UNIV,INVEST DERMATOL LAB,NEW YORK,NY 10021
[2] CORNELL UNIV,COLL MED,DEPT SURG,NEW YORK,NY
[3] CHIBA UNIV,SCH MED,DEPT DERMATOL,CHIBA 280,JAPAN
关键词
D O I
10.1111/j.1751-1097.1996.tb05657.x
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Psoralen plus UVA (320-400 nm radiation; PUVA) is a highly effective therapy for cutaneous diseases caused by skin infiltration with normal or neoplastic T-lymphocytes. In comparing the effects of pharmacologically relevant, low-dose PUVA treatment on growth of human keratinocytes, peripheral blood leukocytes (PBMC), and T-lymphocyte cell lines, we determined that PBMC or T-lymphocyte were >50-fold more sensitive to cytotoxic effects of PUVA, while antiproliferative effects were produced by similar PUVA levels in all cell types. Low doses of PUVA (10 ng/mL 8-methoxypsoralen and 1-2 J/cm(2)) were highly cytotoxic for phytohemagglutinin-activated normal lymphocytes or transformed T-lymphocytes as assessed by two viability assays and by flow cytofluorometry. Altered lymphocyte morphology, nuclear fragmentation, TUNEL+ nuclei or nuclear fragments, and the appearance of a sub-G(1) DNA peak indicated that cell death occurred by apoptosis, beginning about 1 day after PUVA treatment and continuing for several days there-after. From assessment of cell cycle progression in mimosine-synchronized cells, PUVA treatment markedly slowed cell cycle progression, eventually producing cell cycle arrest and apoptotic entry. We propose that the probable basis for disease remissions (psoriasis, cutaneous T-cell lymphoma) produced by PUVA treatment is through selective cytotoxic effects on clonal T-lymphocyte populations that are concentrated in diseased skin.
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页码:566 / 571
页数:6
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