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Importance of monocytes/macrophages and fibroblasts for healing of micronecroses in porcine myocardium. Mol Cell Biochem 1995 Jun 7-21;147(1-2):13-9

Date

06/07/1995

Pubmed ID

7494542

DOI

10.1007/bf00944778

Abstract

In porcine heart, embolization of small coronary arteries with microspheres in 25 microns in diameter induces collateral capillary vessel growth by angiogenesis in and around focal necrosis. By histological analysis the inflammatory infiltrates in this porcine tissue were characterized by numerous monocytes/macrophages and fibroblasts as well as neutrophils and numerous capillaries, some in mitosis. The aim of the present study, therefore, was to clarify the role of monocytes/macrophages and fibroblasts in angiogenesis and in repair in ischemic porcine myocardium. Using a human acidic fibroblast growth factor (aFGF) cDNA probe for in situ hybridisation labeling for aFGF mRNA was seen in monocytes and macrophages only, beginning at day 1, with a maximum at 3 and 7 days, and minimal labeling at 4 weeks. We have also shown, with a specific antibody and fluorescence microscopy, that tumur necrosis factor alpha (TNF alpha) follows the same time sequence and that it is produced by monocytes/macrophages. The number of capillaries in infiltrates at 3 and 7 days as revealed by the lectin Dolichus Biflorus Agglutinin was high and declined at 4 weeks. In situ hybridisation using a rat cDNA probe for fibronectin showed the increased production of fibronectin mRNA in fibroblasts. To describe the expression of fibronectin and the collagens I, III, VI immunohistochemistry was used. A comparison showed that fibroblasts produced fibronectin mRNA starting at day 3, but the protein was only maximally expressed at day 7 and 4 weeks. Collagen I, III, VI expression was highest at 1-4 weeks.(ABSTRACT TRUNCATED AT 250 WORDS)

Author List

Weihrauch D, Arras M, Zimmermann R, 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
Collagen
Fibroblast Growth Factors
Fibroblasts
Fibronectins
Immunohistochemistry
In Situ Hybridization
Macrophages
Microscopy, Electron
Myocardial Ischemia
Myocardium
Necrosis
Neovascularization, Physiologic
RNA, Messenger
Swine
Tumor Necrosis Factor-alpha
jenkins-FCD Prod-399 190a069c593fb5498b7fcd942f44b7bc9cdc7ea1