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J. Biol. Chem., Vol. 279, Issue 4, 2885-2893, January 23, 2004

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Plasma Membrane-Cytoskeleton-Endoplasmic Reticulum Complexes in Neurons and Astrocytes^*

Lubomira Lencesova, Andrea O'Neill, Wendy G. Resneck, Robert J. Bloch, and Mordecai P. Blaustein

From the Department of Physiology, University of Maryland School of Medicine, Baltimore, Maryland 21201

The possibility that certain integral plasma membrane (PM) proteins involved in Ca²⁺ homeostasis form junctional units with adjacent endoplasmic reticulum (ER) in neurons and glia was explored using immunoprecipitation and immunocytochemistry. Rat brain membranes were solubilized with the mild, non-ionic detergent, IGEPAL CA-630. Na⁺/Ca²⁺ exchanger type 1 (NCX1), a key PM Ca²⁺ transporter, was immunoprecipitated from the detergent-soluble fraction. Several abundant PM proteins co-immunoprecipitated with NCX1, including the 2 and 3 isoforms of the Na⁺ pump catalytic () subunit, and the 2 subunit of the dihydropyridine receptor. The adaptor protein, ankyrin 2 (Ank 2), and the cytoskeletal proteins, -fodrin and -spectrin, also selectively co-immunoprecipitated with NCX1, as did the ER proteins, Ca²⁺ pump type 2 (SERCA 2), and inositol-trisphosphate receptor type 1 (IP₃R-1). In contrast, a number of other abundant PMs, adaptors, and cytoskeletal proteins did not co-immunoprecipitate with NCX1, including the Na⁺ pump 1 isoform, PM Ca²⁺ pump type 1 (PMCA1), -fodrin, and Ank 3. In reciprocal experiments, immunoprecipitation with antibodies to the Na⁺ pump 2 and 3 isoforms, but not 1, co-immunoprecipitated NCX1; the antibodies to 1 did, however, co-immunoprecipitate PMCA1. Antibodies to Ank 2, -fodrin, -spectrin and IP₃R-1 all co-immunoprecipitated NCX1. Immunocytochemistry revealed partial co-localization of -spectrin with NCX1, Na⁺ pump 3, and IP₃R-1 in neurons and of -fodrin with NCX1 and SERCA2 in astrocytes. The data support the idea that in neurons and glia PM microdomains containing NCX1 and Na⁺ pumps with 2 or 3 subunits form Ca²⁺ signaling complexes with underlying ER containing SERCA2 and IP₃R-1. These PM and ER components appear to be linked through the cytoskeletal spectrin network, to which they are probably tethered by Ank 2.

Received for publication, September 18, 2003 , and in revised form, October 29, 2003.

^* This work was supported by National Institutes of Health Grants NS-16106, HL-45215 (to M. P. B.), NS-17282, and HL-64304 (to R. J. B.). 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.

To whom correspondence should be addressed: Dept. of Physiology, University of Maryland School of Medicine, 655 W. Baltimore St., Baltimore, MD 21201. Tel.: 410-706-3345; Fax: 410-706-8341; E-mail: mblauste{at}umaryland.edu.

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