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Related Experiment Videos

Pathways signaling the regulatory volume decrease of cultured nonpigmented ciliary epithelial cells

M M Civan1, M Coca-Prados, K Peterson-Yantorno

  • 1Department of Physiology, University of Pennsylvania School of Medicine, Philadelphia 19104-6085.

Investigative Ophthalmology & Visual Science
|May 1, 1994
PubMed
Summary
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Swelling-activated chloride channels in aqueous humour formation: on the one side and the other.

Acta physiologica (Oxford, England)·2006

Nonpigmented ciliary epithelial (NPE) cells utilize unique signaling pathways for regulatory volume decrease (RVD). Swelling activates arachidonic acid turnover, influencing ion channel activity and cell volume regulation.

Area of Science:

  • Cell Biology
  • Physiology
  • Ocular Science

Background:

  • Nonpigmented ciliary epithelial (NPE) cells regulate intraocular pressure via volume control.
  • Regulatory Volume Decrease (RVD) is a critical response to cell swelling, involving ion transport.
  • Understanding NPE cell RVD signaling is crucial for ocular physiology and disease.

Purpose of the Study:

  • To elucidate the specific signaling pathways governing RVD in human NPE cells.
  • To identify key molecular mediators and their roles in NPE cell volume regulation.

Main Methods:

  • Human NPE cells were analyzed using electronic cell sorting to measure volume changes.
  • Experiments involved manipulating osmolality with sucrose in controlled ionic strength solutions.
  • Pharmacological agents were used to probe specific signaling molecules and pathways.

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Main Results:

  • Cyclic AMP (cAMP), forskolin, PGE2, and Ca2+ activity enhanced RVD.
  • PKC activators (DiC8) and certain inhibitors (indomethacin, ketoconazole, SKF 525A) downregulated RVD.
  • Gramicidin increased RVD, and its presence altered the effects of other agents, highlighting complex interactions.
  • Results differed significantly from those reported in other cell types.

Conclusions:

  • NPE cell RVD signaling pathways are distinct and cell-type specific.
  • Hypotonic swelling likely stimulates arachidonic acid turnover, leading to PGE2 and epoxide signaling.
  • These pathways modulate K+ and Cl- channels, respectively, contributing to RVD.
  • Calcium-calmodulin plays a permissive role in Cl- channel regulation during swelling.