HSPA5 protein expression profiles in benzo(a)pyrene-stressed rat glomerular mesangial cells (rGMCs). Western blot analysis of HSPA5 protein in rGMCs exposed to 10 μM actinomycin (AD), 100 nM thapsigargin (TH), AD + TD, 3 μM BaP, 3 μM BaP + 10 μM AD, 3 μM BaP + 10 μM HgCl2, 3 μM BaP + 10 μM Pb2+ acetate