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Purpose . To evaluate the dose effect of vitamin K 3  on wound healing mechanisms.  Methods . Conjunctival fibroblasts were incubated for 24 hours. An artificial wound was made and the cells were incubated with fresh medium plus doses of vitamin K 3  to be tested. Wound repair was monitored at 0, 18, 24, and 48 hours. Proliferation was measured in actively dividing cells by [ 3 H]thymidine uptake. Six different groups were tested: group 1/no drugs added, group 2/ethanol 0.1%, group 3/vitamin K 3  1 mg/L, group 4/vitamin K 3  2 mg/L, group 5/vitamin K 3  4 mg/L, and group 6/vitamin K 3  6 mg/L. Each experiment was carried out in triplicate and 4 times.  Results . There were no differences among groups at the initial time.  In vitro  wound repair was slower in groups 4, 5, and 6. There were no differences between control and ethanol groups and between control and vitamin K 3  1 mg/L groups. Fibroblast mitogenic activity was statistically decreased in all vitamin K groups; statistical differences were found among vitamin K 3  1 mg/mL and higher doses too. In groups 5 and 6, cellular toxicity was presented.  Conclusions . Vitamin K 3  is able to inhibit fibroblast proliferation. Vitamin K 3  2 mg/L or higher doses inhibit wound healing repair, exhibiting cellular toxicity at 4 and 6 mg/L.

In VitroVitamin K3Effect on Conjunctival Fibroblast Migration and Proliferation

In VitroVitamin K₃Effect on Conjunctival Fibroblast Migration and Proliferation