Activation of lectin-like oxidized low-density lipoprotein receptor-1 induces apoptosis in cultured neonatal rat cardiac myocytes
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Summary
This summary is machine-generated.Lectin-like oxidized LDL receptor-1 (LOX-1) is expressed in cardiac myocytes and induced by heart failure factors. LOX-1 triggers apoptosis via p38 MAPK and oxidative stress, offering potential therapeutic targets.
Area Of Science
- Cardiovascular Biology
- Cellular Signaling
- Molecular Cardiology
Background
- Lectin-like oxidized LDL receptor-1 (LOX-1) is primarily found in endothelial cells.
- LOX-1 activation is linked to apoptosis, but its role in cardiac myocytes was unexplored.
Purpose Of The Study
- To investigate LOX-1 expression in cardiac myocytes.
- To determine LOX-1's role in regulating myocardial cell apoptosis.
Main Methods
- Immunohistochemistry in primary neonatal rat cardiac myocytes.
- In vivo studies using failing rat hearts.
- LOX-1 overexpression and apoptosis assays in cultured cardiac myocytes.
- Analysis of p38 MAPK activation and oxidative stress markers.
Main Results
- LOX-1 expression is induced by norepinephrine and endothelin-1 in cardiac myocytes.
- LOX-1 is upregulated in failing rat hearts.
- LOX-1 overexpression induces apoptosis, p38 MAPK activation, and oxidative stress.
- Inhibition of p38 MAPK or oxidative stress blocks LOX-1-induced apoptosis.
Conclusions
- Cardiac myocyte LOX-1 expression is induced by neurohormonal factors relevant to heart failure.
- LOX-1-dependent apoptosis in cardiac myocytes requires p38 MAPK and is linked to oxidative stress.