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KCa3.1 ion channel: A novel therapeutic target for corneal fibrosis

Govindaraj Anumanthan1,2, Suneel Gupta1,2, Michael K Fink1,2

  • 1Harry S. Truman Memorial Veteran Hospital, Columbia, Missouri, United States of America.

Plos One
|March 20, 2018
PubMed

Insights

Blocking the KCa3.1 channel with TRAM-34 reduces corneal fibrosis. This channel is crucial for corneal wound healing and fibrosis development, offering a new therapeutic target for vision impairment.

Area of Science:

  • Ophthalmology and Vision Science
  • Cell Biology
  • Pharmacology

Background:

  • Corneal fibrosis, a leading cause of vision impairment, results from abnormal wound healing.
  • Intermediate-conductance calmodulin/calcium-activated K+ channels 3.1 (KCa3.1) are implicated in fibrosis in non-ocular tissues but their role in corneal fibrosis is unknown.
  • Understanding KCa3.1's role is crucial for developing novel anti-fibrotic therapies for the cornea.

Purpose of the Study:

  • To characterize KCa3.1 expression in the human cornea.
  • To investigate the role of KCa3.1 in corneal wound healing in vivo using KCa3.1 knockout mice.
  • To evaluate the therapeutic potential of KCa3.1 inhibition with TRAM-34 in an in vitro model of corneal fibrosis.

Main Methods:

  • KCa3.1 gene and protein expression analysis in human and murine corneas.
  • In vitro studies using human corneal fibroblasts (HCFs) treated with TRAM-34, assessing pro-fibrotic markers (qPCR, Western blotting) and cell migration (scratch assay).
  • In vivo assessment of corneal fibrosis in KCa3.1 knockout mice and cytotoxicity testing of TRAM-34.

Main Results:

  • KCa3.1 expression was detected in all layers of the human cornea.
  • KCa3.1 knockout mice exhibited significantly reduced corneal fibrosis and lower expression of pro-fibrotic markers (collagen I, α-SMA).
  • TRAM-34 treatment significantly inhibited TGFβ-mediated pro-fibrotic gene and protein expression in HCFs without observed cytotoxicity.

Conclusions:

  • KCa3.1 plays a significant role in regulating corneal wound healing and fibrosis.
  • Blockade of KCa3.1 by TRAM-34 effectively attenuates corneal fibrosis in vitro.
  • KCa3.1 inhibition represents a promising therapeutic strategy for treating corneal fibrosis and preventing vision impairment.

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