JAK2/STAT3-IN-1 -10a) is a potent inhibitor of GP130, exhibiting an IC50 value of 3.04 µM and demonstrating anti-tumor activity.

HA-2a inhibits the JAK2/STAT3 pathway by downregulating circDcbld2 expression in RAW264.7 cells [1].

DPP, a Platinum(IV) complex with a pterostilbene-derived axial ligand, inhibits the JAK2-STAT3 pathway in breast cancer (BC) cells, demonstrating antiproliferative activity. It activates caspase-3 and cleaved poly ADP-ribose polymerase, inducing apoptosis. Furthermore, DPP enhances the maturation and antigen presentation of dendritic cells and exhibits in vivo safety [1].

1. Cucurbitacin IIA (Dihydrocucurbitacin Q1) can induce apoptosis and enhance autophagy , contributes to the anti-inflammatory activity of Cucurbitacin IIA against inflammation-related diseases. 2. Cucurbitacin IIA is a novel class of anti-cancer drug in suppression of cancer cell expansion by disrupting the actin cytoskeleton and directing the cell to undergo PARP-mediated apoptosis through the inhibition of survivin downstream of JAK2/STAT3.

Compound A8, known as JAK2-IN-9, is a selective JAK2 inhibitor with an IC50 of 5 nM. It effectively inhibits the phosphorylation of JAK2, STAT3, and STAT5, possesses metabolic stabilities, and induces apoptosis. This compound is utilized in the study of myeloproliferative neoplasms (MPNs) [1].

1. Desmethoxyyangonin (5,6-Dehydrokavain) protects LPS or LPS/D-GalN-induced damages in cell or liver tissues mainly through de-regulating IKK/NFκB and Jak2/STAT3 signaling pathways. 2. The induction of CYP3A23 by dihydromethysticin and Desmethoxy yangonin involves transcription activation, probably through a PXR-independent or PXR-involved indirect mechanism.

α7 nAchR-JAK2-STAT3 agonist 1 is a potent inhibitor of the α7 nAchR-JAK2-STAT3 pathway that acts on nitric oxide (NO) (IC50: 0.32 μM). α7 nAchR-JAK2-STAT3 agonist 1 has been shown to have a positive effect on iNOS, IL-1β and IL-1β in murine macrophages RAW264.7. α7 nAchR-JAK2-STAT3 agonist 1 was effective in inhibiting the expression of iNOS, IL-1β and IL-6 in mouse macrophages. α7 nAchR-JAK2-STAT3 agonist 1 inhibited LPS-induced NO release, NF-κB activation and cytokine production. α7 nAchR-JAK2-STAT3 agonist 1 was able to be used to study sepsis.

Protosappanin A (PTA) has anti-oxidative/nitrative activities on brain immune and neuroinflammation through regulation of CD14/TLR4-dependent IKK/IκB/NF-κB inflammation signal pathway; it exerts anti-neuroinflammatory effect by inhibiting JAK2-STAT3 pathway in lipopolysaccharide-induced BV2 microglia. Protosappanin A induces immunosuppression of rats heart transplantation targeting T cells in grafts via NF-kappaB pathway. Protosappanin A and protosappanin B have antimicrobial activity, they show both alone activities and resistance reversal effects of amikacin and gentamicin against MRSA. Protosappanin A shows strong effect against HIV-1 IN with an IC50 value of 12.6 uM.

INCB16562 is a novel, selective, and orally bioavailable small-molecule inhibitor of JAK1 and JAK2 markedly selective over JAK3. Treatment of myeloma cells with INCB16562 potently inhibited interleukin-6 (IL-6)-induced phosphorylation of STAT3. INCB16562 abrogated the protective effects of recombinant cytokines or bone marrow stromal cells and sensitized myeloma cells to cell death by exposure to dexamethasone, melphalan, or bortezomib. Oral administration of INCB16562 antagonized the growth of myeloma xenografts in mice and enhanced the antitumor activity of relevant agents in combination studies. INCB16562 is a potent JAK1/2 inhibitor and that mitigation of JAK/STAT signaling by targeting JAK1 and JAK2 will be beneficial in the treatment of myeloma patients, particularly in combination with other agents. ( source: Neoplasia. 2010 Jan;12(1):28-38. ).