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JAK/STAT Signaling Pathway
An evolutionary conserved cascade mediating the cellular response to cytokines and growth factors, integral to immune development and hematopoiesis.
The Janus Kinase / Signal Transducers and Activators of Transcription (JAK/STAT) pathway is an evolutionary conserved signaling cascade which mediates the response to cytokines and growth factors.
Cellular responses to the activation of this pathway include proliferation, differentiation, migration, apoptosis, and cell survival. Because of its direct link to cytokine receptors, JAK/STAT signaling is integral to homeostatic and developmental processes such as hematopoiesis, immune system development, stem cell maintenance, organismal growth, and mammary gland development.
1. JAK/STAT Pathway Map
In theory, the JAK/STAT signaling cascade is a simple, direct mechanism linking extracellular signals to a transcriptional response in the nucleus, avoiding reliance on complex secondary messengers.
2. The Core Mechanism of Action
The activation of the JAK/STAT pathway occurs through a rapid, highly specific sequence of phosphorylation events originating at the cell membrane.
A
Receptor Multimerization
The pathway is activated upon the binding of an extracellular ligand, typically an interferon, interleukin, or growth factor. This binding induces the multimerization of the receptor subunits, bringing two intracellularly bound Janus Kinases (JAKs) into close proximity.
B
JAK Transphosphorylation
Once brought together, the JAKs activate one another through reciprocal transphosphorylation. The activated JAKs then phosphorylate specific tyrosine residues on the cytoplasmic tail of the receptor itself.
C
STAT Activation & Transcription
These newly phosphorylated receptor tyrosines serve as docking sites for STATs (latent transcription factors residing in the cytoplasm). Once docked, the JAKs phosphorylate the STATs. The activated STATs then dissociate from the receptor, dimerize, and translocate into the nucleus, where they bind to specific enhancer sequences to initiate gene transcription.
3. Pathway Crosstalk & Regulation
While the linear JAK/STAT cascade is relatively simple, its biological impact is heavily complicated by regulatory feedback loops and crosstalk with other major signaling pathways.
- Negative Regulation: Suppressors of Cytokine Signaling (SOCS) and Protein Inhibitors of Activated STATs (PIAS) are rapidly transcribed following pathway activation to create a negative feedback loop, preventing chronic, pathological inflammation.
- Phosphatase Activity: SHP phosphatases (like SHP2) dephosphorylate the activated receptors and JAKs, turning off the signal.
- Crosstalk: The JAK/STAT pathway frequently intersects with the Ras/MAPK, PI3K/Akt, and TGF-β pathways to fine-tune cellular proliferation and survival responses.
4. A Selection of JAK/STAT Signaling Products
Biorbyt offers a comprehensive catalog of highly validated primary antibodies to accurately map every step of the JAK/STAT cascade, including critical phosphorylation events and regulatory proteins.
| Cat. Number | Target Name | Species Reactivity | Applications |
|---|---|---|---|
| orb214134 | JAK1 antibody | Canine, Human, Mouse, Rat | ICC, IF, IHC-P, WB |
| orb318917 | JAK2 antibody | Canine, Human, Monkey, Mouse, Porcine, Rat | ICC, IF, IHC-P, WB |
| orb315571 | JAK3 antibody | Human, Monkey, Mouse | ICC, IF, IHC-P, WB |
| orb106147 | STAT3 (phospho-Tyr705) antibody | Human, Mouse, Rat | FC |
| orb224046 | SOCS1 antibody | Human, Mouse | ICC, IF, WB |
| orb1928729 | MEK2 antibody | Human, Mouse | ICC, IF, IHC-P, WB |
| orb5178 | ERK1/2 (phospho-Thr202/Tyr204) antibody | Human, Mouse, Rat | FC |
| orb176694 | PIAS1 antibody | Human, Mouse, Rat | ICC, IF, IHC-P, WB |
| orb14691 | SHP2 antibody | Human, Mouse | ICC, IF, IHC-P, WB |
| orb1933074 | PI3KC3 antibody | Mouse, Porcine, Rat, Xenopus | ELISA, ICC, IF, IHC-P, WB |
| orb344403 | Akt (phospho-S473) antibody | Human, Mouse, Rat | ELISA, FACS, ICC, IF, IHC-P, WB |
| orb13590 | mTOR antibody | Human, Mouse | IHC-P, WB |
5. Pathway Inhibitors & Modulators
Because of its central role in immunology and oncology, the JAK/STAT pathway is a primary target for pharmacological intervention. Discover our range of highly selective small molecule inhibitors for your in vitro and in vivo assays.
Pathway Inhibition
Ruxolitinib
A highly potent, selective inhibitor of JAK1 and JAK2 used extensively in myeloproliferative neoplasm models.
Pathway Inhibition
Tofacitinib
A selective JAK1 and JAK3 inhibitor widely utilized in autoimmune and inflammatory research.
Quantification
STAT3 ELISA Kits
Quantify total or phosphorylated STAT3 levels rapidly from cell lysates to confirm downstream pathway inhibition.