VAP-A and Its Binding Partner CERT Drive Biogenesis of RNA-containing Extracellular Vesicles at ER Membrane Contact Sites
Overview
Reproductive Medicine
Authors
Affiliations
RNA transfer via extracellular vesicles (EVs) influences cell phenotypes; however, lack of information regarding biogenesis of RNA-containing EVs has limited progress in the field. Here, we identify endoplasmic reticulum membrane contact sites (ER MCSs) as platforms for the generation of RNA-containing EVs. We identify a subpopulation of small EVs that is highly enriched in RNA and regulated by the ER MCS linker protein VAP-A. Functionally, VAP-A-regulated EVs are critical for miR-100 transfer between cells and in vivo tumor formation. Lipid analysis of VAP-A-knockdown EVs revealed reductions in the EV biogenesis lipid ceramide. Knockdown of the VAP-A-binding ceramide transfer protein CERT led to similar defects in EV RNA content. Imaging experiments revealed that VAP-A promotes luminal filling of multivesicular bodies (MVBs), CERT localizes to MVBs, and the ceramide-generating enzyme neutral sphingomyelinase 2 colocalizes with VAP-A-positive ER. We propose that ceramide transfer via VAP-A-CERT linkages drives the biogenesis of a select RNA-containing EV population.
Hermann D, Wang C, Mohamud Yusuf A, Herz J, Doeppner T, Giebel B J Cereb Blood Flow Metab. 2025; :271678X251325039.
PMID: 40072028 PMC: 11904928. DOI: 10.1177/0271678X251325039.
Saftics A, Purnell B, Beres B, Thompson S, Jiang N, Ghaeli I Anal Chem. 2025; 97(3):1654-1664.
PMID: 39804668 PMC: 11780574. DOI: 10.1021/acs.analchem.4c04614.
Rickettsia parkeri forms extensive, stable contacts with the rough endoplasmic reticulum.
Acevedo-Sanchez Y, Woida P, Anderson C, Kraemer S, Lamason R J Cell Biol. 2025; 224(3).
PMID: 39775737 PMC: 11706211. DOI: 10.1083/jcb.202406122.
Transfer of and increases 3D growth and invasiveness in recipient cancer cells.
Nelson H, Qu S, Huang L, Shameer M, Corn K, Chapman S Extracell Vesicles Circ Nucl Acids. 2024; 5(3):397-416.
PMID: 39697634 PMC: 11648436. DOI: 10.20517/evcna.2024.43.
GPBP or CERT: The Roles in Autoimmunity, Cancer or Neurodegenerative Disease-A Systematic Review.
Vivo P, Hernandez-Andreu J, Prieto-Ruiz J, Ventura Gonzalez I Int J Mol Sci. 2024; 25(23).
PMID: 39684889 PMC: 11642137. DOI: 10.3390/ijms252313179.