fibroblast (NIH
3T3) cells were used for cell culture. Cells were seeded on nano-
and microfiber PVB membranes sterilized with UV light at concentration
2 × 104 cells per sample. Cell culture was carried
out in an incubator at 37 °C and an atmosphere with a concentration
of 5% CO2 and humidity about 90%. NIH 3T3 cells were cultured
in a complete culture medium composed of Dulbecco’s modified
Eagle medium (DMEM with 4.5 g/L
with 10% of fetal bovine serum (FBS, Sigma-Aldrich, USA), 2% of antibiotics
(penicillin–streptomycin, Sigma-Aldrich, USA), 1% of
nonessential amino acid solution 100×, Sigma-Aldrich, USA). The
medium was changed three times a week, except samples for lactate
dehydrogenase (LDH) assay.