title: The effect of IL-1alpha and nifedipine on cell proliferation and DNA synthesis in cultured human gingival fibroblasts.
abstract: The effect of nifedipine and interleukin-alpha (IL-1alpha) 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 nonresponders in the presence of nifedipine and IL-lalpha. Fibroblasts derived from nifedipine responders showed significantly higher cell proliferation rate in the presence of nifedipine and IL-1alpha, than nifedipine or IL-lalpha alone on both the second and the fourth day of incubation (P < 0.05). A combination of IL-1alpha and epidermal growth factor also showed significantly greater cell proliferation than IL-lalpha alone on the second day (P < 0.05). The DNA synthesis rate with a combination of nifedipine and IL-1alpha was higher than that for nifedipine alone on the second day (P < 0.01), and IL-1alpha 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.
authors.affiliation: Departments of Oral Molecular Pharmacology, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
authors.forename: Naoto
authors.initials: N
authors.lastname: Sato
authors.forename: Hiroko
authors.initials: H
authors.lastname: Matsumoto
authors.forename: Yoshiaki
authors.initials: Y
authors.lastname: Akimoto
authors.forename: Akira
authors.initials: A
authors.lastname: Fujii
mesh_terms: D000368:Aged; D002121:Calcium Channel Blockers / Q000494:pharmacology*; D016022:Case-Control Studies; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D004261:DNA Replication / Q000187:drug effects; D004357:Drug Synergism; D005260:Female; D005347:Fibroblasts / Q000187:drug effects; D005881:Gingiva / Q000166:cytology / Q000187:drug effects*; D005883:Gingival Crevicular Fluid / Q000737:chemistry; D019214:Gingival Overgrowth / Q000139:chemically induced*; D005891:Gingivitis / Q000378:metabolism; D006801:Humans; D007375:Interleukin-1 / Q000494:pharmacology*; D008297:Male; D008875:Middle Aged; D009543:Nifedipine / Q000494:pharmacology*
chemical_list: D002121:Calcium Channel Blockers; D007375:Interleukin-1; D004247:DNA; D009543:Nifedipine