Regulation of eNOS in caveolae
1Department of Pediatrics, University of Texas Southwestern Medical Center, Dallas, TX, USA. chieko.mineo@utsouthwestern.edu
Advances in Experimental Medicine and Biology
|March 14, 2012
Summary
Caveolae regulate endothelial nitric oxide synthase (eNOS) activity. Cardiovascular risk factors like HDL and estrogen activate eNOS, while C-reactive protein inhibits it, impacting cardiovascular health.
Area of Science:
- Endothelial cell biology
- Molecular cardiology
- Signal transduction
Background:
- Caveolae are specialized lipid domains on endothelial cell membranes.
- They compartmentalize signaling molecules regulating endothelial functions, including nitric oxide (NO) production by endothelial NO synthase (eNOS).
- eNOS activity is modulated by caveolin, circulating factors, and signaling pathways within caveolae.
Purpose of the Study:
- To investigate the role of caveolae in regulating endothelial NO synthase (eNOS) activity.
- To elucidate how cardiovascular disease risk factors influence eNOS function within caveolae.
- To understand the impact of these signaling events on endothelial cell phenotypes relevant to cardiovascular health.
Main Methods:
- The study focuses on the molecular interactions and signaling pathways within caveolae.
- It examines the effects of high-density lipoprotein cholesterol (HDL), estrogen, and C-reactive protein (CRP) on eNOS activity.
- Mechanisms involving scavenger receptor class B, Type I (SR-BI), estrogen receptors (ER), and FcγRIIB are investigated.
Main Results:
- HDL and estrogen promote eNOS function and activity within caveolae through distinct signaling pathways.
- C-reactive protein (CRP) antagonizes eNOS activity via FcγRIIB.
- Estrogen and CRP also influence endothelial cell growth and migration through their effects on eNOS.
Conclusions:
- Caveolae serve as critical signaling hubs for cardiovascular risk factors impacting eNOS.
- Modulation of eNOS by HDL, estrogen, and CRP within caveolae significantly affects endothelial cell function.
- These findings highlight the importance of caveolar signaling in cardiovascular health and disease.
More Related Videos
08:56Demonstration of Proteolytic Activation of the Epithelial Sodium Channel (ENaC) by Combining Current Measurements with Detection of Cleavage Fragments
Published on: July 5, 2014
08:41Monitoring Endoplasmic Reticulum Calcium Homeostasis Using a Gaussia Luciferase SERCaMP
Published on: September 6, 2015
Related Concept Videos
01:45Regulation of Nuclear Protein Sorting
Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
01:24Regulation of Angiogenesis and Blood Supply
Rapidly dividing tumors, embryos, and wounded tissues require more oxygen than usual, lowering the oxygen concentration in the blood. At low oxygen or hypoxic conditions, an oxygen-sensitive transcription factor called the hypoxia-inducible factor 1 or HIF1 is activated. HIF1 is a dimeric protein of alpha (ɑ) and beta (β) subunits. Under optimal oxygen conditions, HIF1β is present in the nucleus while HIF1ɑ remains in the cytosol. HIF1ɑ is hydroxylated by prolyl hydroxylase and factor...
01:27Feedback Regulation of Calcium Concentration
Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
Various transmembrane receptors, such as G protein-coupled receptors (GPCRs), elicit a response to extracellular signals by increasing cytosolic calcium. Activated GPCRs...
01:15Receptor Downregulation in MVBs
Multivesicular bodies (MVBs) are mature endosomes that sort ubiquitinated proteins and then fuse with lysosomes to degrade the sorted proteins. Epidermal growth factor (EGF) and its receptor (EGFR) form a complex that can be internalized through endocytosis, sorted into an MVB, and later degraded.
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
The EGFR can initiate signaling pathways that lead to cell proliferation, migration, and differentiation. Overexpression of EGFR stimulates cells to proliferate. Excessive EGFR activation may...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
02:58Regulated Protein Degradation
It is vital to regulate the activity of enzymatic as well as non-enzymatic proteins inside the cell. This can be achieved either through creating a balance between their rate of synthesis and degradation or regulating the intrinsic activity of the protein. Both these regulation mechanisms play an essential role in the normal functioning of cells.
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...
Protein degradation plays two important roles in the cells. It helps to protect cells from misfolded or damaged proteins before they lead to a...