The JAK/STAT pathway and Drosophila development

H Luo1, C R Dearolf

  • 1The Cardiovascular Research Institute, Division of Molecular Cardiology, The Texas A&M University System Health Science Center, College of Medicine, Temple, Texas 76504, USA. hluo@medicine.tamu.edu

Insights

The Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway is vital for mammalian cell functions. Drosophila serves as a powerful model for studying JAK/STAT signaling in vivo.

Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Developmental Biology

Background:

  • The Janus kinase/signal transducer and activator of transcription (JAK/STAT) pathway is crucial for cellular processes in mammals, including hematopoiesis and immune responses.
  • Key components of the JAK/STAT pathway have been identified and studied in the model organism Drosophila.

Purpose of the Study:

  • To highlight the utility of Drosophila as a model system for investigating the in vivo functions of the JAK/STAT signaling pathway.
  • To explore the developmental roles of JAK/STAT pathway components through mutational analyses in Drosophila.

Main Methods:

  • Characterization of JAK/STAT pathway components in Drosophila.
  • Utilizing mutational analyses to uncover developmental roles and identify interacting molecules.
  • Leveraging Drosophila for in vivo functional studies of JAK/STAT signaling.

Main Results:

  • Mutational analyses in Drosophila have revealed significant developmental roles for JAK/STAT pathway components.
  • These studies provide a framework for identifying novel interacting molecules and pathways within the JAK/STAT network.

Conclusions:

  • The JAK/STAT pathway in Drosophila is a valuable and attractive model for comprehensive in vivo functional analyses.
  • Drosophila research contributes to understanding the broader biological significance of JAK/STAT signaling.

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...
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...
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,...