Cell proliferation in vitro modulates fibroblast collagenase activity

Conference · Thu May 01 04:00:00 EDT 1986 · Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States)

OSTI ID:6936862

Lindblad, W J; Flood, L

Collagenase enzyme activity is regulated by numerous control mechanisms which prevent excessive release and activation of this protease. A primary mechanism for regulating enzyme extracellular activity may be linked to cell division, therefore they have examined the release of collagenase by fibroblasts in vitro in response to cellular proliferation. Studies were performed using fibroblasts derived from adult rat dermis maintained in DMEM containing 10% newborn calf serum, 25 mM tricine buffer, and antibiotics. Cells between subculture 10 and 19 were used with enzyme activity determined with a /sup 14/C-labelled soluble Type I collagen substrate with and without trypsin activation. Fibroblasts, trypsinized and plated at low density secreted 8.5 fold more enzyme than those cells at confluence (975 vs. 115 dpm/..mu..g DNA). This diminution occurred gradually as the cells went from logrithmic growth towards confluence. Confluent fibroblast monolayers were scraped in a grid arrangement, stimulating the remaining cells to divide, without exposure to trypsin. Within 24-48 hr postscraping enzyme levels had increased 260-400%, accompanied by enhanced incorporation of /sup 3/H-thymidine and /sup 3/H-uridine into cell macromolecules. The burst of enzyme release began to subside 12 hr later. These results support a close relationship between fibroblast proliferation and collagenase secretion.

• Research Organization: Medical College of Virginia, Richmond
• OSTI ID: 6936862
• Report Number(s): CONF-8606151-
• Conference Information: Journal Name: Fed. Proc., Fed. Am. Soc. Exp. Biol.; (United States) Journal Volume: 45:6
• Country of Publication: United States
• Language: English

Related Subjects

550201* -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
ANIMAL CELLS
ANIMALS
AZINES
CARBON 14 COMPOUNDS
CELL PROLIFERATION
CONNECTIVE TISSUE CELLS
ENZYME ACTIVITY
ENZYMES
FIBROBLASTS
HETEROCYCLIC COMPOUNDS
HYDROLASES
HYDROXY COMPOUNDS
IN VITRO
ISOTOPE APPLICATIONS
LABELLED COMPOUNDS
MAMMALS
NUCLEOSIDES
NUCLEOTIDES
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PEPTIDE HYDROLASES
PYRIMIDINES
RATS
RIBOSIDES
RODENTS
SERINE PROTEINASES
SOMATIC CELLS
THYMIDINE
TRACER TECHNIQUES
TRITIUM COMPOUNDS
TRYPSIN
URACILS
URIDINE
VERTEBRATES