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Updated: Sep 18, 2025

A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors
10:17

A Mass Spectrometry-Based Approach to Identify Phosphoprotein Phosphatases and their Interactors

Published on: April 29, 2022

2.5K

The phosphatase PPM1F, a negative regulator of integrin activity, is essential for embryonic development and controls

Tanja M Grimm1,2, Nina I Dierdorf1,2, Marleen Herbinger1

  • 1Lehrstuhl Zellbiologie, Fachbereich Biologie, Maildrop 621, Universität Konstanz, Universitätsstrasse 10, Konstanz, Germany.

BMC Biology
|June 19, 2025
PubMed
Abstract

Insights

The phosphatase PPM1F is essential for embryonic development and regulates cell adhesion and migration. Its disruption causes severe defects, highlighting its role in preventing tumor metastasis.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Developmental Biology

Background:

  • The Mn2+/Mg2+-dependent Ser/Thr phosphatase PPM1F regulates integrin activity and cytoskeletal organization.
  • PPM1F is implicated in various critical physiological processes.

Purpose of the Study:

  • To investigate the in vivo function of PPM1F through gene disruption in mice.
  • To elucidate the role of PPM1F in cell adhesion, migration, and tumor invasion.

Main Methods:

  • Generation and analysis of ppm1f knockout mice.
  • Phenotypic characterization of ppm1f-/- mice and derived cells (MEFs).
  • Assessment of integrin-dependent cell adhesion, PAK phosphorylation, and cell migration in PPM1F-depleted cells.

Main Results:

  • ppm1f-/- mice exhibit severe developmental defects, embryonic lethality at E10.5, and morphological abnormalities in the brain and vasculature.
  • PPM1F deficiency in MEFs and human neuro-epithelial cells leads to increased integrin-dependent adhesion, deregulated PAK phosphorylation, and impaired cell migration.
  • Re-expression of wildtype PPM1F restored normal phenotypes, while a phosphatase-inactive mutant did not.
  • PPM1F expression levels correlate with invasive potential in human tumors, and its deletion inhibits tissue invasion.

Conclusions:

  • PPM1F plays a critical, non-redundant role in regulating integrin signaling and PAK activity.
  • PPM1F is essential for normal embryonic development and cellular functions like adhesion and migration.
  • PPM1F represents a potential therapeutic target for inhibiting tumor metastasis.
Keywords:
Cancer cell invasionCell adhesionDevelopmental defectsFilaminAIntegrin activityKnock-out mousePPM1FProtein phosphataseTalinThreonine phosphorylation

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