Flow cytometry was used to investigate the effect of 254 nm wavelength
UV irradiation on single rat thymocytes suspension in vitro The Induc
tion of apoptosis has been observed in dose range less 20 J/m(2). More
high UV doses inhibited thymocyte apoptosis induced by dexamethasone,
ionizing radiation and by UV Itself. The necessity of protein kinase
C activation has been demonstrated for realization of such dual effect
of UV (apoptosis Induction and supression).