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Downregulation of the Long Non-Coding RNA KLRK1-AS1 Disturbs Endothelial Barrier Integrity and Promotes Angiogenic
Elisa Weiss1, Azra Kulovic-Sissawo1, Anke S van Bergen2,3
1Research Unit Early Life Determinants (ELiD), Medical University of Graz, Auenbruggerplatz 14, 8036 Graz, Austria.
Life (Basel, Switzerland)
|February 27, 2026
Summary
The long non-coding RNA KLRK1-AS1 maintains endothelial barrier integrity. Its depletion promotes endothelial colony-forming cells (ECFCs) to become more angiogenic, highlighting KLRK1-AS1's role in vascular health.
Area of Science:
- Endothelial biology
- Epigenetics
- Vascular biology
Background:
- Endothelial integrity is crucial for cardiovascular health.
- Endothelial colony-forming cells (ECFCs) are vital for vascular repair.
- Long non-coding RNAs (lncRNAs) regulate endothelial cell function.
Purpose of the Study:
- To investigate the role of lncRNA KLRK1-AS1 in endothelial biology.
- To determine KLRK1-AS1's impact on ECFC function and vascular integrity.
Main Methods:
- ECFCs were treated with siRNA to silence KLRK1-AS1.
- Evaluated ECFC monolayer morphology, barrier stability (ECIS), proliferation, and angiogenic activity.
Main Results:
- KLRK1-AS1 silencing altered ECFC morphology but not proliferation.
- Knockdown significantly reduced endothelial barrier integrity by 44%.
- Loss of KLRK1-AS1 enhanced ECFC angiogenic behavior by 62%.
Conclusions:
- KLRK1-AS1 promotes a stable endothelial phenotype with intact barrier function.
- KLRK1-AS1 depletion shifts ECFCs towards a more angiogenic state.
- KLRK1-AS1 is a novel regulator of endothelial function and vascular integrity.
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