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Expression and Purification of the Human Lipid-sensitive Cation Channel TRPC3 for Structural Determination by Single-particle Cryo-electron Microscopy
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Plasma membrane localization and function of TRPC1 is dependent on its interaction with beta-tubulin in retinal

Sunitha Bollimuntha1, Eric Cornatzer, Brij B Singh

  • 1Department of Biochemistry and Molecular Biology, School of Medicine & Health Sciences, University of North Dakota, Grand Forks, ND 58201, USA.

Visual Neuroscience
|June 7, 2005
PubMed

Insights

Transient Receptor Potential C1 (TRPC1) channels are present in retinal cells and contribute to calcium influx. TRPC1

Area of Science:

  • Neuroscience
  • Cell Biology
  • Ophthalmology

Background:

  • Mammalian Transient Receptor Potential C (TRPC) proteins are implicated in store-operated calcium (SOC) influx.
  • TRPC1 is a candidate channel for SOC mechanisms in various cell types.

Purpose of the Study:

  • To investigate the role of TRPC1 in the SOC mechanism within retinal cells.
  • To confirm the expression and localization of TRPC1 in retinal pigment epithelial (ARPE) cells and bovine retinal tissue.

Main Methods:

  • Detection of htrpc1 transcript via RT-PCR.
  • Western blot analysis for TRPC1 protein expression.
  • Recombinant expression of TRPC1 in ARPE cells and measurement of intracellular calcium influx.
  • Immunofluorescence and co-immunoprecipitation assays to study TRPC1 localization and interactions.
  • Assessment of TRPC1 function and localization after tubulin disruption with colchicine.

Main Results:

  • TRPC1 transcript and protein were detected in bovine retinal and human ARPE cells.
  • Overexpression of TRPC1 in ARPE cells led to a significant increase in calcium influx.
  • TRPC1 protein localized to the plasma membrane in ARPE cells.
  • TRPC1 co-localized and co-immunoprecipitated with beta-tubulin in retinal cells.
  • Disruption of tubulin significantly reduced TRPC1 plasma membrane localization and calcium influx.

Conclusions:

  • TRPC1 channels are expressed in retinal cells and contribute to calcium influx.
  • The interaction between TRPC1 and beta-tubulin is crucial for TRPC1 targeting and retention at the plasma membrane in retinal cells.
  • This interaction influences the function of TRPC1 in store-operated calcium entry in the retina.

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