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Article
The TRPC2 Channel Forms Protein-Protein interactions with Homer and RTP in the Rat Vomeronasal Organ
BMC Neuroscience
  • Thomas G. Mast
  • Jessica H. Brann, Loyola University Chicago
  • Debra A. Fadool
Document Type
Article
Publication Date
1-1-2010
Disciplines
Abstract
BACKGROUND: The signal transduction cascade operational in the vomeronasal organ (VNO) of the olfactory system detects odorants important for prey localization, mating, and social recognition. While the protein machinery transducing these external cues has been individually well characterized, little attention has been paid to the role of protein-protein interactions among these molecules. Development of an in vitro expression system for the transient receptor potential 2 channel (TRPC2), which establishes the first electrical signal in the pheromone transduction pathway, led to the discovery of two protein partners that couple with the channel in the native VNO. RESULTS: Homer family proteins were expressed in both male and female adult VNO, particularly Homer 1b/c and Homer 3. In addition to this family of scaffolding proteins, the chaperones receptor transporting protein 1 (RTP1) and receptor expression enhancing protein 1 (REEP1) were also expressed. RTP1 was localized broadly across the VNO sensory epithelium, goblet cells, and the soft palate. Both Homer and RTP1 formed protein-protein interactions with TRPC2 in native reciprocal pull-down assays and RTP1 increased surface expression of TRPC2 in in vitro assays. The RTP1-dependent TRPC2 surface expression was paralleled with an increase in ATP-stimulated whole-cell current in an in vitro patch-clamp electrophysiological assay. CONCLUSIONS: TRPC2 expression and channel activity is regulated by chaperone- and scaffolding-associated proteins, which could modulate the transduction of chemosignals. The developed in vitro expression system, as described here, will be advantageous for detailed investigations into TRPC2 channel activity and cell signalling, for a channel protein that was traditionally difficult to physiologically assess.
Identifier
PMID:12472899 | PMCID:PMC3082845
Comments

©2010 Mast et al; licensee BioMed Central Ltd.This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Creative Commons License
Creative Commons Attribution 3.0
Citation Information
Mast, Thomas G, Jessica H Brann, and Debra A Fadool. “The TRPC2 Channel Forms Protein-Protein Interactions with Homer and RTP in the Rat Vomeronasal Organ.” BMC Neuroscience 11 (2010): 61. doi:10.1186/1471-2202-11-61.