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Published on: October 12, 2017
Expression of Apolipoprotein L1 Risk Variants at the Plasma Membrane and Haplotype-Dependent Cytotoxicity
Oyindamola Christiana Adebayo1,2, Ilhem Dallali3,4,5, Sara Kerselaers4,5
1Department of Cardiovascular Sciences, Center for Molecular and Vascular Biology, KU Leuven, Leuven, Belgium.
Apolipoprotein L1 (APOL1) risk variants form calcium (Ca2+) pores in cell membranes, increasing cell damage. This gain-of-function mechanism explains APOL1-associated kidney disease and can be blocked by specific variants or inhibitors.
Area of Science:
- Nephrology
- Molecular Biology
- Cell Biology
Background:
- Mechanisms of APOL1 risk variants (G1, G2) in kidney disease are unclear.
- APOL1 variants are associated with kidney disease in African ancestry populations.
Purpose of the Study:
- Investigate APOL1-mediated cytotoxicity.
- Elucidate APOL1's role in ion transport and cell death.
Main Methods:
- Utilized HEK-293 cells and human podocytes.
- Employed genetic, electrophysiological, and microscopy techniques.
Main Results:
- APOL1 variants form cation-permeable pores, allowing Ca2+ influx.
- Extracellular Ca2+ influx via APOL1 causes cytotoxicity.
- APOL1 risk variants show increased basal channel activity, leading to cell death.
- N264K variant and VX-147 inhibitor block Ca2+ influx and protect cells.
Conclusions:
- APOL1 is a membrane protein facilitating extracellular Ca2+ influx.
- Increased APOL1 activity drives cytotoxicity, supporting a gain-of-function model.
- N264K and VX-147 demonstrate therapeutic potential by inhibiting APOL1 activity.
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