Materials and MethodsSMGs of 120 male Sprague-Dawley rats were irradiated with a single X-ray dose (3,10,20, or 30 Gy). At the early and late post-irradiation phase, apoptosis was measured by the terminal deoxynucleotidyl transferase biotin-dUTP nick end labeling (TUNEL) method, and expression of AQP5 and TGF-βwas determined by immunohistochemical staining.
ResultsAt the late post-irradiation phase, increased apoptosis was evident and marked decreases of expression of AQP5 expression by acinar cells and TGF-βexpression by ductal cells were evident.
ConclusionApoptosis after X-ray irradiation develops relatively late in rat SMG. Irradiation reduces AQP5 and TGF-βexpression in different SMG cell types.