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Updated: Oct 2, 2026

Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates
08:19

Evaluation of Keratinocyte Proliferation on Two- and Three-dimensional Type I Collagen Substrates

Published on: April 22, 2019

NF1 tumor suppressor mRNA is targeted to the cell-cell contact zone in Ca(2+)-induced keratinocyte differentiation

Heli Ylä-Outinen1, Jussi Koivunen, Marja Nissinen

  • 1Department of Anatomy and Cell Biology, University of Oulu, Oulu, Finland.

Laboratory Investigation; a Journal of Technical Methods and Pathology
|March 16, 2002
PubMed
Abstract

Insights

Neurofibromatosis type 1 (NF1) mRNA relocates in differentiating skin cells, suggesting actin microfilaments are key for its transport. This finding reveals a novel mechanism for regulating NF1 expression.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Type 1 neurofibromatosis (NF1) is a genetic disorder.
  • NF1 tumor suppressor protein relocalizes during keratinocyte differentiation.
  • The distribution of NF1 mRNA during this process was previously unknown.

Purpose of the Study:

  • To investigate the subcellular localization of NF1 mRNA in differentiating keratinocytes.
  • To determine the role of the cytoskeleton in NF1 mRNA distribution.
  • To explore potential post-transcriptional regulation of NF1.

Main Methods:

  • In situ hybridization to detect NF1 mRNA.
  • Induction of keratinocyte differentiation in vitro.
  • Disruption of the microfibrillar cytoskeleton and microtubules.

Main Results:

  • NF1 mRNA signal intensified and polarized to cell junctions in differentiating keratinocytes.
  • NF1 mRNA disappeared from junctions and reappeared in migrating cells.
  • Disruption of actin microfilaments, but not microtubules, altered NF1 mRNA distribution.
  • NF1 mRNA is not targeted to free polysomes or the rough endoplasmic reticulum.

Conclusions:

  • Actin microfilaments are essential for the peripheral transport of NF1 mRNA.
  • NF1 mRNA exhibits unique localization patterns, distinct from mRNAs targeted to ribosomes.
  • This suggests a novel mechanism for post-transcriptional regulation of NF1 expression.

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