[Effect of cyclosporin A and tumor necrosis factor-α on cell proliferation of cultured human gingival fibroblasts].

ABSTRACT

OBJECTIVE: To investigate the effect of cyclosporin A (CsA) and tumor necrosis factor-α (TNF-α) on cell proliferation of cultured human gingival fibroblasts (GF), and the relationship between gingival inflammation and drug-induced gingival overgrowth. METHODS: Human GF were cultured in vitro using tissue culture method. then cells from the 4 - 8 th passage were used in the experiment. The cells were cultured and incubated with various concentrations of CsA and TNF-α (A blank group, B1 10 µg/L CsA, B2 50 µg/L CsA, B3 250 µg/L CsA, B4 1250 µg/L CsA, C 5 µg/L TNF-α, D1 10 µg/L CsA + 5 µg/L TNF-α, D2 50 µg/L CsA + 5 µg/L TNF-α, D3 250 µg/L CsA + 5 µg/L TNF-α, D4 1250 µg/L CsA + 5 µg/L TNF-α) solution for 3, 5 and 7 days. Methyl thiazolyl tetrazolium assay was used to evaluate the cell proliferation in the culture meidiun. RESULTS: The proliferation of fibroblasts was inhibited when exposed to different concentration of CsA and A value decreased. There was no significant difference between group B1, B2, B3 and the control group, while the A value of group B4 was significantly higher than that of control group (P < 0.01). Fibroblast proliferation was significantly increased while cultured with 5 µg/L TNF-α. A value increased (P < 0.01). When exposed to CsA + TNF-α, A value of group D1, D2, D3 was much higher than that of group A, but was lower than that of group C (P < 0.05). Cell proliferation in group D4 was significantly increased, and significantly different with that in group C (P < 0.01). CONCLUSIONS: CsA did not stimulate the cell proliferation, and high concentration of CsA inhibited cell proliferation. TNF-α can stimulate the cell proliferation. High-concentration CsA + TNF-α can enhance the fibroblast proliferation, which suggests that CsA in certain concentration have amplification effect on TNF-α to stimulate fibroblast proliferation.