Faculty Collaboration Database

Expression of extracellular matrix proteins and the role of fibroblasts and macrophages in repair processes in ischemic porcine myocardium. Cell Mol Biol Res 1994;40(2):105-16

Date

01/01/1994

Pubmed ID

7849762

Abstract

In the experimental model of coronary microembolization in pig hearts, the processes of wound healing and scar formation were studied. Methods employed were: electron microscopy, immunohistochemistry using monoclonal antibodies (against fibronectin, laminin, collagen I, III, and VI, chondroitin sulfate, and vimentin), and in situ hybridization with radioactively labeled RNA (histones, fibronectin) or cDNA (acidic fibroblast growth factor) probes. The following time course for expression of various proteins and their mRNAs was established: Mitotic activity was significant at 3 d as well as expression of fibronectin mRNA. Cellularity comprising blood borne cells and macrophages was high. At 7 d, fibronectin, laminin and collagen VI accumulation were pronounced, vimentin positive cells were numerous. At 4 weeks, collagen expression was prominent, but interstitial cells were still present. It is concluded that healing after myocardial necrosis passes through the classical phases of wound healing, i.e., granulation tissue formation and final scar formation. Different extracellular matrix proteins show a differing time course of expression, tumor necrosis factor-alpha (TNF-alpha) and acidic fibroblast growth factor (aFGF) produced by macrophages may be involved in inflammatory processes and angiogenesis. Scar formation is not yet completed at 4 weeks after injury.

Author List

Weihrauch D, Zimmermann R, Arras M, Schaper J

Author

Dorothee Weihrauch DVM, PhD Professor in the Anesthesiology department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Animals
Cicatrix
DNA, Complementary
Embolism
Extracellular Matrix Proteins
Fibroblasts
Gene Expression
Immunohistochemistry
In Situ Hybridization
Macrophages
Microscopy, Electron
Myocardial Ischemia
RNA, Messenger
Swine
Time Factors
Wound Healing