Cell cycle-dependent localization of tissue inhibitor of metalloproteinases-1 immunoreactivity in cultured human gingival fibroblasts

Nagoya J Med Sci. 1995 Dec;58(3-4):133-42.

Abstract

Localization of the tissue inhibitor of metalloproteinases-1 (TIMP-1) was investigated in cultured human gingival fibroblasts by immunohistochemistry. TIMP-1 immunostaining was observed in the cytoplasm of a majority of cells, and in the nucleus of some cells. Depletion of fetal calf serum (FCS) from the culture medium reduced the density of immunoreactive TIMP-1 in the nucleus more remarkably than in the cytoplasm, and the following FCS-induced cell growth was accompanied by a recovery of immuno-reactive TIMP-1 in both the nucleus and the cytoplasm. The frequency of the nuclear TIMP-1-positive cells changed in line with that of PCNA-positive cells and was always much higher than that of S-phase cells, which were estimated by a pulse labelled 5-Bromo-2' deoxyuridine (BrdU). These results suggest a localization of TIMP-1 or a related substance in the nucleus of proliferating human fibroblasts, and its depletion from the nucleus due to an arrest of cell growth.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Cell Cycle / physiology*
  • Cell Line
  • Fibroblasts / chemistry
  • Gingiva / chemistry*
  • Gingiva / cytology
  • Glycoproteins / analysis*
  • Humans
  • Metalloendopeptidases / antagonists & inhibitors*
  • Protease Inhibitors / analysis*
  • Tissue Inhibitor of Metalloproteinases

Substances

  • Glycoproteins
  • Protease Inhibitors
  • Tissue Inhibitor of Metalloproteinases
  • Metalloendopeptidases