Related Experiment Video

Updated: Sep 21, 2025

Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation
09:40

Analysis of the c-KIT Ligand Promoter Using Chromatin Immunoprecipitation

Published on: June 27, 2017

7.8K

The SCF/KIT axis in human mast cells: Capicua acts as potent KIT repressor and ERK predominates PI3K

Kristin Franke1,2, Marieluise Kirchner3, Philipp Mertins3

  • 1Institute of Allergology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany.

Allergy
|June 2, 2022
PubMed
Abstract

Insights

Stem cell factor (SCF) signaling via KIT is crucial for mast cell (MC) biology. This study reveals ERK as the dominant kinase pathway and identifies a novel inhibitory circuit involving CIC, offering therapeutic potential for allergic diseases.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • The stem cell factor (SCF)/KIT signaling pathway is fundamental to mast cell (MC) biology.
  • A detailed understanding of SCF-induced phosphorylation dynamics and its link to MC functions is currently lacking.

Purpose of the Study:

  • To comprehensively map SCF-triggered phosphoproteomic changes in human mast cells.
  • To elucidate the signaling pathways and molecular mechanisms underlying SCF/KIT-mediated mast cell functions.
  • To identify novel regulators of KIT signaling and their therapeutic implications.

Main Methods:

  • Isolation of human skin mast cells and stimulation with SCF.
  • Global phosphoproteomic analysis using LC-MS/MS.
  • Validation of phosphosites by immunoblotting.
  • Assessment of mast cell survival, proliferation, gene expression, and cytokine production.
  • Pharmacological inhibition and knockdown of key signaling molecules (e.g., ERK1/2).
  • Investigation of CIC protein localization, degradation, and its impact on KIT signaling.

Main Results:

  • SCF stimulation regulated approximately 5400 phosphosites, with the MEK/ERK cascade being the most prominent signaling pathway.
  • ERK was identified as the most influential kinase in regulating mast cell functional outputs, including gene expression and cytokine production.
  • A novel inhibitory circuit was discovered where SCF-induced phosphorylation leads to the cytoplasmic translocation and degradation of CIC, which in turn enhances KIT signaling and mast cell survival.

Conclusions:

  • The SCF/KIT axis is a potent regulator of mast cell biology, with the MEK/ERK pathway playing a central role.
  • A previously unrecognized inhibitory interaction between KIT signaling and CIC protein was identified.
  • Targeting CIC stabilization in mast cells presents a potential therapeutic strategy for allergic and mast cell-mediated diseases.
Keywords:
KITRTKscapicuamast cellssignal transduction

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