PrPccapping in T cells promotes its association with the lipid raft proteins reggie‐1 and reggie‐2 and leads to signal transduction
Open Access
- 2 September 2004
- journal article
- Published by Wiley in The FASEB Journal
- Vol. 18 (14), 1731-1733
- https://doi.org/10.1096/fj.04-2150fje
Abstract
The cellular prion protein (PrPc) resides in lipid rafts, yet the type of raft and the physiological function of PrPc are unclear. We show here that cross-linking of PrPc with specific antibodies leads to 1) PrPc capping in Jurkat and human peripheral blood T cells; 2) to cocapping with the intracellular lipid raft proteins reggie-1 and reggie-2; 3) to signal transduction as seen by MAP kinase phosphorylation and an elevation of the intracellular Ca2+ concentration; 4) to the recruitment of Thy-1, TCR/CD3, fyn, lck and LAT into the cap along with local tyrosine phosphorylation and F-actin polymerization, and later, internalization of PrPc together with the reggies into limp-2 positive lysosomes. Thus, PrPc association with reggie rafts triggers distinct transmembrane signal transduction events in T cells that promote the focal concentration of PrPc itself by guiding activated PrPc into preformed reggie caps and then to the recruitment of important interacting signaling molecules.Keywords
Funding Information
- Ministerium für Wissenschaft, Forschung und Kunst Baden-Württemberg
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