UVB radiation from the sun is believed to cause up to 90% of
skin cancers that are not melanomas [34]. Chronic exposure of the
skin to UVB radiation induces oxidative stress, which plays a crucial
role in the induction of skin cancer. The UV protective activities of
UAP and FAP on keratinocytes were determined using UVB-induced
HaCa T cells. Cytotoxic effects of treated group were shown in Fig. 5.
Both UAP and FAP (25 g/mL) had no significantly cytotoxic effects
on the HaCa T cells, whereas FAP has less cytotoxicity compared
with UAP at higher concentration.
Fig. 6 shows HaCa T cell viability in the MTT assay after UVB
irradiation. Cell viability decreased to 52.98% after UVB irradiation.
However, UAP and FAP in the concentration of 25 g/mL significantly protected HaCa T cells from UVB irradiation. Furthermore,
FAP (p < 0.01) exhibited significantly better protection than did UAP
(p < 0.05).