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Modulation of gap junctions in senescent endothelial cells
1Department of Biochemistry and Molecular Biology, George Washington University Medical Center, Washington, DC 20037.
Experimental Cell Research
|September 1, 1994
Summary
Senescent endothelial cells show reduced gap junction communication due to lower connexin 43 levels. Aging impairs the ability of these cells to regulate gap junctions in response to epidermal growth factor (EGF).
Area of Science:
- Cell Biology
- Aging Research
- Endothelial Cell Biology
Background:
- Gap junction-mediated intercellular communication (GJIC) is crucial for endothelial cell function.
- Cellular senescence, a state of irreversible growth arrest, is associated with altered cell communication.
- Human umbilical vein endothelial cells (HUVEC) are a key model for studying endothelial aging.
Purpose of the Study:
- To investigate the molecular basis of reduced GJIC in senescent HUVEC.
- To examine the effects of calcium and epidermal growth factor (EGF) on GJIC in young and senescent HUVEC.
- To determine the role of connexin 43 (cx43) in age-related changes in endothelial cell communication.
Main Methods:
- Gap-Frap studies to assess GJIC.
- Northern and Western blot analyses to quantify cx43 mRNA and protein levels.
- Treatment of young and senescent HUVEC with calcium ionophore A23187 and EGF.
Main Results:
- GJIC was significantly decreased in senescent HUVEC compared to young cells.
- Both cx43 mRNA and protein levels declined with HUVEC aging in vitro.
- Senescent HUVEC failed to down-regulate gap junction activity in response to EGF, unlike young cells.
Conclusions:
- Down-regulation of cx43 in senescent endothelial cells suggests a role for GJIC in the aging process.
- Senescent HUVEC exhibit a defect in the regulatory mechanism controlling gap junction activity.
- These findings highlight molecular changes in endothelial cells during senescence that impact intercellular communication.