The effect of IL-1α and nifedipine of cell proliferation and DNA synthesis in cultured human gingival fibroblasts

Abstract

The effect of nifedipine and interleukin-α (IL-1α) on the cell proliferation and DNA synthesis was studied in human gingival fibroblasts derived from 5 patients who developed gingival overgrowth (nifedipine responders) and 5 patients who did not develop gingival overgrowth (nifedipine non-responders) in response to nifedipine. Epidermal growth factor was used as a positive control. The fibroblasts derived from nifedipine responders tended to have a numerically greater rate of cell proliferation and DNA synthesis (³H-thymidine incorporation) than those from nifedipine non-responders in the presence of nifedipine and IL-1α. Fibroblasts derived from nifedipine responders showed significantly higher cell proliferation rate in the presence of nifedipine and IL-1α, than nifedipine or IL-1α alone on both the second and the fourth day of incubation (P < 0.05). A combination of IL-1α and epidermal growth factor also showed significantly greater cell proliferation than IL-1α alone on the second day (P < 0.05). The DNA synthesis rate with a combination of nifedipine and IL-1α was higher than that for nifedipine alone on the second day (P < 0.01), and IL-1α alone on the fourth day (P < 0.05) in gingival fibroblasts originating from nifedipine responders. These results suggest that the interaction between nifedipine and gingival inflammation might play an important role in the pathogenesis of nifedipine-induced gingival overgrowth. (J. Oral Sci. 47, 105-110, 2005)