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2005 | 52 | 1 | 179-194
Article title

Apoptosis induced by membrane damage in human lymphocytes; effects of arachidonic acid and its photoproducts.

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The effect of arachidonic acid (AA) combined with UVA irradiation was studied in a model system mimicking phototherapy PUVA (psoralen+UVA) ex vivo in vitro. The contribution of damage to the plasma membrane by PUVA was tested on human lymphocytes derived from healthy donors. The effect of arachidonic acid (AA) combined with UVA irradiation was compared with that of a psoralen photoadduct to AA added to the culture. The adduct, obtained photochemically and purified, was characterized by NMR and MS spectrometry as a cycloadduct of psoralen to the vinylene bond of the acid (AA<>PSO). The reactions of cultured cells, manifested 20 h after treatment by changes in apoptosis and mitochondrial depolarization, were monitored by flow cytometry by tagging lymphocytes with appropriate fluorescent probes. Treatment of lymphocyte suspension within AA doses from 40 to 100 μM gradually induced a shift from Anx-V+ (single positive cells) to late apoptotic, Anx-V+PI+ (double positive cells) in a dose dependent manner. The adduct, AA<>PSO, induced apoptotic changes at a concentration 2-3 times higher than free AA. Combination of psoralen (1 μM ) or arachidonic acid (20-120 μM) with UVA irradiation (2-6 J/cm2) accelerated the plasma membrane changes in a synergic way. Preliminary studies indicated that changes in the transmembrane potential of mitochondria paralleled the apoptosis when cells were treated by AA alone. Our findings showed that UVA radiation of lymphocytes in the presence of arachidonic acid, as in the presence of psoralen, enhanced apoptosis of cells in a synergic manner. Thus, PUVA-induced apoptosis may proceed in part by a still undefined signaling pathway(s) triggered in lymphocyte membranes.
Physical description
  • Institute of Biochemistry and Biophysics of the Polish Academy of Sciences, Warszawa, Poland
  • Institute of Biochemistry and Biophysics of the Polish Academy of Sciences, Warszawa, Poland
  • Institute of Biochemistry and Biophysics of the Polish Academy of Sciences, Warszawa, Poland
  • Department of Pathophysiology & Immunology, Institute of Rheumatology, Warszawa, Poland
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