The cells were exposed to OI in 96-well plates, after exposure, the culture medium was removed, 100 mL of solution with 0.01% trypsin-0.005% EDTA in saline 0.9% was added to each well and the plates were incubated for 10 min at 37 C. Afterwards, triplicates were pooled in a single 1.5 mL microcentrifuge tube and centrifuged at 1500 rpm for 5 min.