Related Experiment Video

Updated: Aug 15, 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

The JAK-STAT pathway: signal transduction involved in proliferation, differentiation and transformation

R M Weber-Nordt1, R Mertelsmann, J Finke

  • 1Department of Hematology & Oncology, Albert-Ludwigs-University Medical Center, Freiburg, Germany. Nordt@mm11.ukl.uni-freiburg.de

Leukemia & Lymphoma
|June 5, 1998
PubMed

Insights

Signal transducer and activator of transcription (STAT) proteins regulate gene expression after activation. Understanding STAT protein regulation and interactions offers insights into cancer cell proliferation.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Genetics

Background:

  • Signal transducer and activator of transcription (STAT) proteins are key mediators of cellular signaling pathways.
  • STAT activation involves phosphorylation and translocation to the nucleus, where they bind DNA to regulate gene expression.
  • Consensus motifs in gene promoters dictate STAT recruitment and protein binding specificity.

Purpose of the Study:

  • To review the current understanding of STAT protein activation, deactivation, and regulation.
  • To explore the crosstalk between the JAK-STAT pathway and other signaling pathways like MAPK, RAS, PI3K, PKC, and PKA.
  • To highlight the significance of STAT-regulated genes and cellular functions in the context of malignant cell proliferation.

Main Methods:

  • Literature review of recent studies on STAT protein function and regulation.
  • Analysis of structural and functional data related to STAT protein deactivation.
  • Examination of signaling pathway crosstalk and gene regulatory networks.

Main Results:

  • STAT proteins are activated by phosphorylation and translocate to the nucleus to bind DNA.
  • Conserved amino-terminal sequences are critical for phosphatase-dependent STAT deactivation.
  • Extensive crosstalk exists between the JAK-STAT pathway and other major signaling cascades.

Conclusions:

  • STAT-mediated signaling is crucial for regulating gene expression and cellular functions.
  • Dysregulation of STAT pathways contributes to malignant cell proliferation.
  • Further understanding of STAT regulation provides insights into cancer mechanisms and potential therapeutic targets.

More Related Videos

Time-resolved Förster Resonance Energy Transfer Assays for Measurement of Endogenous Phosphorylated STAT Proteins in Human Cells07:12

Time-resolved Förster Resonance Energy Transfer Assays for Measurement of Endogenous Phosphorylated STAT Proteins in Human Cells

Published on: September 9, 2021

Intracellular Phosphoflow Cytometry of Acute Myeloid Leukemia Patient-Derived Xenotransplants07:38

Intracellular Phosphoflow Cytometry of Acute Myeloid Leukemia Patient-Derived Xenotransplants

Published on: June 6, 2025

Related Concept Videos

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...
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...
The JAK-STAT Signaling Pathway01:20

The JAK-STAT Signaling Pathway

Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
PI3K/mTOR/AKT Signaling Pathway01:22

PI3K/mTOR/AKT Signaling Pathway

The mammalian target of rapamycin  (mTOR) is a serine/threonine kinase that regulates growth, proliferation, and cell survival in response to hormones, growth factors, or nutrient availability. This kinase exists in two structurally and functionally distinct forms: mTOR complex 1  (mTORC1) and mTOR complex 2  (mTORC2). The first form (mTORC1) is composed of a rapamycin-sensitive Raptor and proline-rich Akt substrate, PRAS40. In contrast,  mTORC2 consists of a rapamycin-insensitive companion...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...