Transforming growth factor-beta, a potent modulator of cell function, induces fibroblasts cultured on plastic to increase collagen synthesis. In 5- and 7-day porcine skin wounds, which have minimal to moderate collagen matrix, respectively, transforming growth factor-beta and type I procollagen were coordinately expressed throughout the granulation tissue. However, in 10-day collagen-rich granu...

Diabetes is known to be associated with impaired wound healing, and loss of collagen related to diabetes may be due to decreased levels of synthesis or enhanced metabolism of newly synthesized collagen or both. This study aims to determine if laser irradiation stimulates cellular proliferation, nitric oxide (NO) and collagen synthesis in diabetic fibroblast cells. Induced diabetic wounded human...

Protein malnutrition aŠects the status of dermal collagen, the major structural protein in the skin. However, the molecular mechanism underlying the alteration of collagen ˆbers in the skin by protein deˆciency remains unknown. In the present study, the eŠect of dietary protein deprivation on collagen metabolism was studied by analyzing the status of the synthesis and degradation of collagen in...

A model system consisting of highly purified lysyl oxidase and reconstituted lathyritic chick bone collagen fibrils was used to study the effect of collagen cross-linking on collagen degradation by mammalian collagenase. The results indicate that synthesis of approx. 0.1 Schiff-base cross-link per collagen molecule results in a 2--3-fold resistance to human synovial collagenase when compared wi...

PTH was studied for its effects on bone formation in cultured rat calvariae. 0.01-10 nM PTH stimulated [3H]thymidine incorporation into DNA by up to 4.8-fold. Although continuous treatment with PTH for 24-72 h inhibited [3H]proline incorporation into collagen, transient (24 h) treatment enhanced [3H]proline incorporation into collagen 24-48 h after the hormone was removed. The collagen stimulat...

Wounds and wound healing have always been one of the most important subjects that experimental researches were dedicated to. Simvastatin has been used for long as a common lipid lowering agent which was reported to have some pleiotropic effects such as antioxidation, anti-inflammation and immunomodulation. In this study we aimed to determine the effect of simvastatin on wound healing process in...

BACKGROUND The aim of this study was to explore the regulating effects of Substance P (SP) on the collagen synthesis of rat myocardial fibroblasts (CFBs) induced by angiotensin II (Ang II) and its potential mechanism. MATERIAL AND METHODS The CFBs of a neonatal SD rat were separately cultured and divided into the control group, Ang II treatment group, and treatment groups with different concent...

Adult human liver biopsies were cultured from normal, alcoholic hepatitis, chronic active hepatitis, fibrosis plus alcoholic hepatitis (active cirrhosis), inactive cirrhosis, and drug hepatitis. The synthesis of collagen was estimated in cultures from 58 livers by measuring the conversion of [(14)C]proline to the [(14)C]hydroxyproline of collagen; that of glycosaminoglycans in cultures from 57 ...

The effect of leukoregulin, a 50-kD lymphokine with unique antitumor properties, was studied in vitro on several fibroblast functions. Leukoregulin did not inhibit fibroblast proliferation, as measured by cell enumeration and [3H]thymidine incorporation, and had no cytotoxic effect in terms of increased membrane permeability detected by trypan blue exclusion, two of the major leukoregulin actio...