LDN-193189

Normal development and tissue repair are controlled in part by SMADs, a family of intracellular proteins that are activated by signaling via serine/threonine kinase receptors of the TGF-β superfamily. LDN-193189 inhibits SMAD1/5/8 phosphorylation by the bone morphogenetic protein (BMP) type I receptors, which are known as activin receptor-like kinases (ALKs), with an IC₅₀ value of 4.9 nM. In in vitro kinase assays, it shows specificity for ALK1, 2, 3, and 6 (IC₅₀s = 0.8, 0.8, 5.3, and 16.7 nM, respectively) over ALK4 and 5 (IC₅₀s = 101 and 350 nM, respectively). LDN-193189 has been used to inhibit BMP type I receptor activity to study the pathogenesis of fibrodysplasia ossificans progressive, a congenital hyperossification disorder, and to examine the role of osteogenesis in prostate tumor metastases in bone.

4-(6-(4-(Piperazin-1-yl)phenyl)pyrazolo[1,5-a]pyrimidin-3-yl)quinoline, is a selective inhibitor of bone morphogenetic protein (BMP) pathway, useful in the treatment of diseases. Potent BMP Inhibitor?, Promotes hPSC Neural Induction?.

ChEBI: 4-[6-[4-(1-piperazinyl)phenyl]-3-pyrazolo[1,5-a]pyrimidinyl]quinoline is a member of pyrimidines.

Although LDN193189 is a structural analog of dorsomorphin, these two drugs are found to establish different cellular responses. In vitro analysis reveals that LDN193189 inhibits a number of intracellular kinases such as, mitogen activated protein kinase 14 and 8 ( p38and c-Jun N-terminal kinase respectively), as well as those associated with AKT (serine/threonine kinase) and mTOR (mammalian target of rapamycin) signaling mechanisms. LDN193189 is known to elevate the levels hemoglobin and thus helps to prevent the onset of anemia of inflammation.

[1] yu pb, deng dy, lai cs, hong cc, cuny gd, bouxsein ml, hong dw, mcmanus pm, katagiri t, sachidanandan c, kamiya n, fukuda t, mishina y, peterson rt, bloch kd. bmp type i receptor inhibition reduces heterotopic [corrected] ossification. nat med. 2008 dec;14(12):1363-9.
[2] boergermann jh1, kopf j, yu pb, knaus p. dorsomorphin and ldn-193189 inhibit bmp-mediated smad, p38 and akt signalling in c2c12 cells. int j biochem cell biol. 2010 nov;42(11):1802-7.
[3] helbing t1, herold em, hornstein a, wintrich s, heinke j, grundmann s, patterson c, bode c, moser m. inhibition of bmp activity protects epithelial barrier function in lung injury. j pathol. 2013 sep;231(1):105-16. doi: 10.1002/path.4215. epub 2013 jul 10.