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J. Biol. Chem., Vol. 280, Issue 17, 17013-17019, April 29, 2005

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Regulation of CD147 Cell Surface Expression

INVOLVEMENT OF THE PROLINE RESIDUE IN THE CD147 TRANSMEMBRANE DOMAIN^*

Vyacheslav Yurchenko, Tatiana Pushkarsky¶, Jian-Hua Li||, Wei Wei Dai||, Barbara Sherry||, and Michael Bukrinsky¶**

From the Albert Einstein College of Medicine of Yeshiva University, Bronx, New York 10461, ^¶George Washington University Medical Center, Washington, D. C. 20037, and ^|| North Shore-Long Island Jewish Research Institute, Manhasset, New York 11030

CD147, also known as extracellular matrix metalloproteinase inducer, is a regulator of matrix metalloproteinase production and serves as a signaling receptor for extracellular cyclophilins. Here we demonstrate that the cell surface expression of CD147 is regulated by cyclophilins via the transmembrane domain of CD147. Solution binding experiments demonstrated that the transmembrane domain was both necessary and sufficient for CD147 binding to cyclophilin A (CypA). Treatment with cyclosporin A significantly reduced surface expression of CD147 and of CD8-CD147 fusion protein carrying the extracellular domain of CD8 fused to the transmembrane and cytoplasmic domains of CD147, but did not affect expression of CD8. Peptide binding studies demonstrated specific interaction between CypA and the proline-containing peptide from the CD147 transmembrane domain. Mutation of this proline residue reduced binding of CD147-derived peptides to CypA and also diminished transport of CD147 to the plasma membrane without reducing the total level of CD147 expression. These results suggest involvement of a cyclophilin-related protein in CD147 cell surface expression and provide molecular details for regulation of CD147 trafficking by cyclophilins.

Received for publication, November 12, 2004 , and in revised form, January 4, 2005.

^* This work was supported in part by National Institutes of Health Grants R01 AI38245 (to M. B.) and R01 AI29110 (to B. S.). The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

Both authors contributed equally to this work.

^** To whom correspondence should be addressed: George Washington University Medical Center, Ross Hall, Rm. 734, 2300 Eye St. N.W., Washington, D. C. 20037. E-mail: mtmmib{at}gwumc.edu.

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