cell line (2 × 105 cells/mL) was cultured in 96-well
tissue microplates (100 μL/well) and allowed to adhere overnight
at 37 °C. The stock of GlcCer (in DMSO) was dissolved in DMEM:Nutrient
mixture F12 (Ham’s) (1:1) (Biological Industries, Israel) at
different concentrations (1–200 μM) for 6 h to generate
GlcCer assemblies (based on ThT results). 1% DMSO was used as the
vehicle. The negative control was prepared as a medium without GlcCer
or DMSO and treated in the same manner. 100 μL of medium with
or without GlcCer aggregates was added to each well. Following incubation
for 24 h at 37 °C, cell viability was evaluated using the 2,3-bis(2-methoxy-4-nitro-5-sulfophenyl)-2H-tetrazolium-5-carboxanilide
(XTT) cell proliferation assay kit (Biological Industries, Israel)
according to the manufacturer’s instructions. Briefly, 100
μL of the activation reagent was added to 5 mL of the XTT reagent,
followed by the addition of 50 μL of activated-XTT solution
to each well. After 2 h of incubation at 37 °C, color intensity
was measured using an ELISA microplate reader at 450 and 630 nm. Results
are presented as mean and the standard error of the mean. Each experiment
was repeated at least three times.