Cholesterol regulates polymodal sensory transduction in Müller glia

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Monika Lakk1, Oleg Yarishkin1, Jackson M Baumann2

  • 1Departments of Ophthalmology and Visual Sciences, University of Utah, Salt Lake City, Utah.

Glia
|September 1, 2017
PubMed

Insights

Cholesterol levels impact glial cell function in the retina. This study shows membrane cholesterol regulates how Müller cells sense and respond to stimuli like chemicals, touch, and temperature.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Ophthalmology

Background:

  • Cholesterol imbalances in the brain and retina activate glial cells, contributing to neurodegenerative diseases.
  • The specific molecular targets of cholesterol within glial cells remain unidentified.

Purpose of the Study:

  • To investigate the role of unesterified membrane cholesterol in modulating sensory transduction in mouse Müller cells.
  • To determine if cholesterol affects the function of the TRPV4 channel in retinal glia.

Main Methods:

  • Müller cells were treated with methyl-beta cyclodextrin (MβCD) to either extract or supplement membrane cholesterol.
  • TRPV4 channel activation was studied using chemical agonists and temperature changes.
  • Intracellular calcium ([Ca2+]i) levels and glial swelling responses were measured.

Main Results:

  • Cholesterol extraction disrupted lipid rafts and caveolae but did not alter TRPV4 trafficking.
  • Reduced membrane cholesterol suppressed agonist- and temperature-evoked calcium signals and glial swelling.
  • Cholesterol supplementation enhanced calcium signaling and shortened glial swelling duration.

Conclusions:

  • Membrane cholesterol content is a key regulator of polymodal sensory transduction in retinal Müller cells.
  • Dyslipidemia may lead to impaired glial cell sensory input processing in retinal diseases.
Keywords:
TRPV4cyclodextrinhypercholesterolemialipid raftswelling

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