Related Experiment Video

Updated: Jun 12, 2026

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
09:32

Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development

Published on: June 15, 2017

Kicked by Mos and tuned by MPF-the initiation of the MAPK cascade in Xenopus oocytes

C Russo, R Beaujois, J-F Bodart

    HFSP Journal
    |June 2, 2010
    PubMed

    Insights

    M-phase promoting factor (MPF) regulates the dynamics of Mos, a key initiator in the mitogen-activated protein kinase (MAPK) cascade. This study reveals MPF

    Area of Science:

    • Cellular signaling pathways
    • Molecular and developmental biology
    • Biophysics

    Background:

    • The mitogen-activated protein kinase (MAPK) cascade is central to cellular events.
    • Mos is the primary initiator of this cascade in Xenopus oocytes.
    • MAPK stabilizes Mos activity via a feedback loop, but Mos levels are not solely MAPK-dependent.

    Purpose of the Study:

    • To investigate how M-phase promoting factor (MPF) regulates Mos dynamics.
    • To elucidate the quantitative interdependence of Mos and MPF in Xenopus oocytes.

    Main Methods:

    • Experimental manipulation of MPF activity (sustained or peaked).
    • Development of a detailed kinetic model for the Mos-MPF-MAPK signaling network.
    • Inclusion of three Mos phosphorylation states in the kinetic model.

    Main Results:

    • MPF activity directly influences the temporal dynamics of Mos.
    • The kinetic model accurately predicts Mos time evolution under MPF control.
    • Demonstration of MPF's regulatory role beyond MAPK in controlling Mos concentration.

    Conclusions:

    • MPF plays a critical role in regulating Mos dynamics in Xenopus oocytes.
    • The developed kinetic model provides a quantitative framework for understanding this signaling network.
    • This research contributes to a more biologically realistic understanding of Mos-MPF interdependence.

    More Related Videos

    Xenopus laevis as a Model to Identify Translation Impairment10:24

    Xenopus laevis as a Model to Identify Translation Impairment

    Published on: September 27, 2015

    Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV412:09

    Yeast Luminometric and Xenopus Oocyte Electrophysiological Examinations of the Molecular Mechanosensitivity of TRPV4

    Published on: December 31, 2013

    Related Concept Videos

    MAPK Signaling Cascades01:07

    MAPK Signaling Cascades

    Mitogen-activated protein kinase, or MAPK pathway, activates three sequential kinases to regulate cellular responses such as proliferation, differentiation, survival, and apoptosis. The canonical MAPK pathway starts with a mitogen or growth factor binding to an RTK. The activated RTKs stimulate Ras, which recruits Raf or MAP3 Kinase (MAPKKK), the first kinase of the MAPK signaling cascade. Raf further phosphorylates and activates MEK or MAP2 Kinases (MAPKK), which in turn phosphorylates MAP...
    cAMP-dependent Protein Kinase Pathways01:25

    cAMP-dependent Protein Kinase Pathways

    Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
    Amplifying Signals via Enzymatic Cascade01:22

    Amplifying Signals via Enzymatic Cascade

    When a ligand binds to a cell-surface receptor, the receptor's intracellular domain changes shape, which may either activate its enzyme function or allow its binding to other molecules. The initial signal is amplified by most signal transduction pathways. This means that a single ligand molecule can activate multiple molecules of a downstream target. Proteins that relay a signal are most commonly phosphorylated at one or more sites, activating or inactivating the protein. Kinases catalyze the...