Induction of heart failure in rats caused temporary increases in skeletal muscle MMP activity and collagen content at 42 days, relating to transient muscle fatigue that normalized by 112 days.
Does induction of congestive heart failure alter extracellular matrix components and cause skeletal muscle fatigue in a rat model?
Temporary alterations in the extracellular matrix, potentially triggered by decreased VEGF, are associated with transient skeletal muscle fatigue in a rat model of heart failure.
Patients with congestive heart failure (CHF) experience increased skeletal muscle fatigue. The mechanism underlying this phenomenon is unknown, but a deranged extracellular matrix (ECM) might be a contributing factor. Hence, we examined ECM components and regulators in a rat postinfarction model of CHF. At various time points during a 3.5 mo-period after induction of CHF in rats by left coronary artery ligation, blood, interstitial fluid (IF), and muscles were sampled. Isoflurane anesthesia was employed during all surgical procedures. IF was extracted by wicks inserted intermuscularly in a hind limb. We measured cytokines in plasma and IF, whereas matrix metalloproteinase (MMP) activity and collagen content, as well as the level of glycosaminoglycans and hyaluronan were determined in hind limb muscle. In vivo fatigue protocols of the soleus muscle were performed at 42 and 112 days after induction of heart failure. We found that the MMP activity and collagen content in the skeletal muscles increased significantly at 42 days after induction of CHF, and these changes were time related to increased skeletal muscle fatigability. These parameters returned to sham levels at 112 days. VEGF in IF was significantly lower in CHF compared with sham-operated rats at 3 and 10 days, but no difference was observed at 112 days. We conclude that temporary alterations in the ECM, possibly triggered by VEGF, are related to a transient development of skeletal muscle fatigue in CHF.
Rehn et al. (Thu,) conducted a other in Congestive heart failure. Induction of CHF by left coronary artery ligation vs. Sham-operated rats was evaluated on Skeletal muscle fatigue, MMP activity, collagen content, and VEGF levels. Induction of heart failure in rats caused temporary increases in skeletal muscle MMP activity and collagen content at 42 days, relating to transient muscle fatigue that normalized by 112 days.