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Related Experiment Video

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Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4

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Dependence of regulatory volume decrease on transient receptor potential vanilloid 4 (TRPV4) expression in human

Zan Pan¹, Hua Yang, Stefan Mergler

¹Department of Biological Sciences, State University of New York, College of Optometry, 33 West 42nd Street, New York, NY 10036, USA.

|March 22, 2008

Summary

This summary is machine-generated.

Transient Receptor Potential Vanilloid 4 (TRPV4) channels facilitate regulatory volume decrease (RVD) in human corneal epithelial cells (HCEC). TRPV4 activation is crucial for maintaining cell volume homeostasis under hypotonic stress.

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Area of Science:

Cell Biology
Physiology
Ocular Surface Research

Background:

The transient receptor potential vanilloid 4 (TRPV4) channel is activated by hypotonicity.
Hypotonic stress induces regulatory volume decrease (RVD) in human corneal epithelial cells (HCEC).

Purpose of the Study:

To investigate the role of TRPV4 channels in mediating RVD in HCEC.
To confirm the functional expression of TRPV4 in HCEC.

Main Methods:

Immunohistochemistry, immunocytochemistry, and FACS analysis for TRPV4 localization and expression.
RT-PCR and Western blot to confirm gene and protein expression.
TRPV4 gene silencing (siRNA) and pharmacological inhibitors (ruthenium red, Ca(2+)-free solution, capsazepine) to assess functional impact.

Main Results:

TRPV4 was localized in corneal tissue and expressed in HCEC.
Hypotonicity and 4alpha-PDD induced intracellular calcium ([Ca2+]i) transients via TRPV4.
TRPV4 knockdown or inhibition significantly reduced [Ca2+]i transients and abrogated RVD.
TRPV1 antagonist capsazepine did not affect TRPV4-mediated responses.

Conclusions:

TRPV4 channels are functionally expressed in HCEC.
TRPV4 plays a significant role in mediating RVD in HCEC.
TRPV4 activation is essential for cellular volume regulation under hypotonic stress.