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Extracellular matrix: Differential influence on growth and biosynthesis patterns of vascular smooth muscle cells from SHR and WKY rats
Author(s) -
ScottBurden Timothy,
Resink Thérèse J.,
Bürgin Maria,
Bühler Fritz R.
Publication year - 1989
Publication title -
journal of cellular physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.529
H-Index - 174
eISSN - 1097-4652
pISSN - 0021-9541
DOI - 10.1002/jcp.1041410206
Subject(s) - elastin , extracellular matrix , glycoconjugate , matrix (chemical analysis) , proteoglycan , thymidine , microbiology and biotechnology , glycosaminoglycan , vascular smooth muscle , chemistry , tropoelastin , cell culture , dna synthesis , biochemistry , biology , smooth muscle , endocrinology , dna , genetics , chromatography
Smooth muscle cells from spontaneously hypertensive rats (SHR) elaborated extracellular matrix (ECM) material in culture that was more stimulatory to growth of cells from normotensive (WKY) animals than their own matrix. Both cell types elaborated ECMs consisting of glycoconjugate material (proteoglycans, glycopeptides) elastin, and collagens, but there were differences in the relative proportions of the compounds synthesized. Cells from SHR produced an ECM richer in elastin than that synthesized by WKY derived cells (∼19% vs. 11%, respectively). However, the latter elaborated ECMs containing more (∼45% for WKY vs. 29% for SHR) glycoconjugate material than the former. The lysyloxidase‐mediated crosslinking of elastin was more rapid in cultured cells from SHR animals than from their normotensive counterparts and may be as a consequence of increased substrate (tropoelastin) availability in ECMs from SHR animals. The relative proportions and sulphate levels of the glycosaminoglycans associated with matrix material elaborated by the two cell types were similar. Radiolabelled glycoconjugate material was degraded by cells (SHR/WKY) when they were plated upon pre‐formed ECMs, and their patterns of synthesis of new matrix was markedly altered under such conditions. New matrix material elaborated by cells plated upon ECM‐coated dishes consisted predominantly of glycopeptide and proteoglycan matrix components. Epidermal growth factor promoted the incorporation of [ 3 H]‐thymidine into DNA by quiescent cells, and this was also markedly stimulated when cells were plated onto ECM‐coated plasticware rather than onto plastic substratum.