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SK3 Gene Polymorphism Is Associated with Taxane Neurotoxicity and Cell Calcium Homeostasis

Carina Rua1,2,3, Maxime Guéguinou1,3, Imane Soubai2,4

  • 1Université de Tours, Inserm, N2C UMR1069, Tours, France.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|July 25, 2018
PubMed

Insights

Genetic variations in the KCNN3 gene influence taxane-induced peripheral neuropathy risk. Patients with short KCNN3 alleles face higher neurotoxicity, suggesting SK3 blockers may prevent this chemotherapy side effect.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Genetics

Background:

  • Taxane-induced peripheral neuropathy is a common, debilitating side effect of chemotherapy.
  • Current treatments lack efficacy in preventing or managing taxane neuropathy.
  • The precise mechanisms underlying taxane neuropathy remain unclear, with ion channels implicated.

Purpose of the Study:

  • To investigate the role of KCNN3 gene CAG repeat polymorphism in taxane-induced neuropathy.
  • To determine if KCNN3 variations affect calcium ion (Ca2+) homeostasis relevant to neurotoxicity.

Main Methods:

  • Evaluated 176 breast cancer patients treated with taxanes.
  • Measured Ca2+ entry in HEK cells expressing short vs. long KCNN3 CAG alleles.
  • Assessed the effect of a SK3-lipid blocker on Ca2+ entry.

Main Results:

  • Cells with short KCNN3 alleles showed increased Ca2+ entry with docetaxel.
  • SK3-lipid blocker diminished the docetaxel-induced Ca2+ increase.
  • Patients with short KCNN3 alleles had a higher incidence of taxane neuropathy.

Conclusions:

  • KCNN3 gene polymorphism influences susceptibility to taxane neurotoxicity.
  • Targeting the SK3 channel may offer a strategy for preventing taxane-induced neuropathy.
  • This finding has clinical implications for personalized chemotherapy regimens.

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