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Increased proteoglycan synthesis by the cardiovascular system of coarctation hypertensive rats
Author(s) -
Lipke David W.,
Couchman John R.
Publication year - 1991
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.1041470314
Subject(s) - ventricle , in vivo , proteoglycan , blood pressure , in vitro , medicine , endocrinology , pressure overload , glycosaminoglycan , chemistry , biology , biochemistry , anatomy , muscle hypertrophy , extracellular matrix , microbiology and biotechnology , cardiac hypertrophy
Proteoglycan (PG) synthesis in the cardiovascular system of coarctation hypertensive rats was examined by in vivo and in vitro labeling of glycosaminoglycans with 35 SO 4 in rats made hypertensive for short (4 days) and longer (14 days) durations. With in vivo labeling, only tissues directly exposed to elevated pressure (left ventricle, LV and aorta above the clip, AOR ↑) exhibited elevated PG synthesis after 4 days of hypertension. By 14 days, tissues both exposed to (LV and AOR ↑) and protected from elevated pressure (right ventricle and kidney) exhibited elevated PG synthetic rates. Slight elevations in the proportion of galactosamnoglycans were observed with a concurrent proportional decrease in heparan sulfate PGs. Using the in vitro labeling procedure, no significant increases in PG synthesis were observed in any tissue at either 4 days or 14 days of hypertension. These data indicate that: (1) coarctation hypertension stimulates PG production that is dependent initially on increased pressure and later, on additional non‐pressure related factors, (2) these other factors are responsible for enhanced PG production in tissues not directly exposed to pressure overload, (3) pressure and/or these other factors are essential for enhanced PG production in coarctation hypertension, and (4) synthesis of all GAG types appears to be affected.