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Related Concept Videos

Small GTPases - Ras and Rho01:24

Small GTPases - Ras and Rho

Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
Three regulatory proteins control their activity:
Interactions Between Signaling Pathways01:19

Interactions Between Signaling Pathways

Signaling cascades usually lack linearity. Multiple pathways interact and regulate one another, allowing cells to integrate and respond to diverse environmental stimuli.
Convergence and divergence, and cross-talk between signaling pathways
Two distinct signaling pathways can converge on a single functional unit, which may either be a single protein or a complex of proteins. The response is either functionally distinct or synergistic between the two pathways but different from the response...
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...
Amplifying Signals via Second Messengers01:15

Amplifying Signals via Second Messengers

Many receptor binding ligands are hydrophilic; they do not cross the cell membrane but bind to cell-surface receptors. Thus, their message must be relayed by second messengers present in the cell cytoplasm. There are several second messenger pathways, each with its own way of relaying information. For example, the G protein-coupled receptors can activate both phosphoinositol and cyclic AMP (cAMP) second messenger pathways. The phosphoinositol pathway is active when the receptor induces...
Assembly of Signaling Complexes01:30

Assembly of Signaling Complexes

Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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...

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Related Experiment Video

Updated: Jun 2, 2026

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
13:51

Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

Published on: November 11, 2018

Signaling pathways regulated by Rho-like proteins.

J Collard

    International Journal of Oncology
    |May 6, 2011
    PubMed
    Summary
    This summary is machine-generated.

    Small GTP-binding proteins like Cdc42, Rac1, and RhoA control cell shape changes. Dysregulation of these proteins impacts cancer progression and metastasis.

    More Related Videos

    RhoC GTPase Activation Assay
    09:58

    RhoC GTPase Activation Assay

    Published on: August 22, 2010

    Related Experiment Videos

    Last Updated: Jun 2, 2026

    Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay
    13:51

    Detection of Small GTPase Prenylation and GTP Binding Using Membrane Fractionation and GTPase-linked Immunosorbent Assay

    Published on: November 11, 2018

    RhoC GTPase Activation Assay
    09:58

    RhoC GTPase Activation Assay

    Published on: August 22, 2010

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Cancer Research

    Background:

    • Small GTP-binding proteins of the Rho-subfamily (Rho-like GTPases), including Cdc42, Rac1, and RhoA, are crucial regulators of actin cytoskeleton dynamics.
    • Growth factor-induced cellular responses heavily rely on the reorganization of the actin cytoskeleton.
    • These Rho-like GTPases are implicated in fundamental cellular processes and signal transduction pathways.

    Purpose of the Study:

    • To elucidate the role of Rho-like GTPases in cellular signaling and their connection to cancer.
    • To investigate the involvement of Rac-regulated pathways in tumor cell invasion and metastasis.
    • To understand the implications of aberrant Rho-like GTPase signaling in tumor progression.

    Main Methods:

    • Review of recent studies on Rho-like GTPases and their signaling pathways.
    • Analysis of the interplay between Rho-like GTPases and the Ras-Raf-MAPK pathway.
    • Examination of the role of Rac pathways in cancer cell invasiveness.

    Main Results:

    • Rho-like GTPases are key mediators of growth factor-induced actin cytoskeleton reorganization.
    • Signaling pathways involving Rho-like GTPases intersect with the Ras-Raf-MAPK pathway.
    • Rac-regulated pathways are implicated in the acquisition of invasive and metastatic phenotypes in tumor cells.

    Conclusions:

    • Aberrations in Rho-like GTPase signaling pathways can significantly influence tumor progression and metastasis.
    • Understanding these pathways is critical for developing therapeutic strategies against cancer.
    • Rho-like GTPases represent important targets for intervention in cancer metastasis.