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J. Biol. Chem. 277 (49): 47671-47678

© 2002 by The American Society for Biochemistry and Molecular Biology, Inc.

Intercellular Transfer of the Cellular Prion Protein*

Tong LiuDagger , Ruliang LiDagger , Tao PanDagger , Dacai LiuDagger , Robert B. PetersenDagger , Boon-Seng WongDagger §, Pierluigi GambettiDagger , and Man Sun Sy||

From the Dagger  Division of Neuropathology, Institute of Pathology,  Cancer Research Center, School of Medicine, Case Western Reserve University, Cleveland, Ohio 44106

The cellular prion protein (PrPC) is a glycosylphosphatidylinositol (GPI)-anchored protein. We investigated whether PrPC can move from one cell to another cell in a cell model. Little PrPC transfer was detected when a PrPC expressing human neuroblastoma cell line was cultured with the human erythroleukemia cells IA lacking PrPC. Efficient transfer of PrPC was detected with the presence of phorbol 12-myristate 13-acetate, an activator of protein kinase C. Maximum PrPC transfer was observed when both donor and recipient cells were activated. Furthermore, PrPC transfer required the GPI anchor and direct cell to cell contact. However, intercellular protein transfer is not limited to PrPC, another GPI-anchored protein, CD90, also transfers from the donor cells to acceptor cells after cellular activation. Therefore, this transfer process is GPI-anchor and cellular activation dependent. These findings suggest that the intercellular transfer of GPI-anchored proteins is a regulated process, and may have implications for the pathogenesis of prion disease.


* This work was supported in part by National Institutes of Health Grant AG14359 and a contract from the Prion Developmental Laboratory. The Confocal Microscopy Facility was supported by National Institutes of Health Grant PO30CA43703.The costs of publication of this article were defrayed in part by the payment of page charges. The article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

§ Recipient of a Medical Research Scientist Award from the National Medical Research Council, Singapore.

|| To whom correspondence should be addressed: BRB, Rm. 933, School of Medicine, Case Western Reserve University, 10900 Euclid Ave., Cleveland OH 44106. Tel.: 216-368-1268; Fax: 216-368-1357; E-mail: mxs92@po.cwru.edu.


Copyright © 2002 by The American Society for Biochemistry and Molecular Biology, Inc.


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