1. Signaling Pathways
  2. TGF-beta/Smad
  3. TGF-β Receptor
  4. ALK3 Isoform


BMPR1A (bone morphogenetic protein receptor type 1A) is also known as ALK3. Though some functions of ALK3 suggest similarity to ALK2, this protein has substantial sequence similarity with a different ALK family member, ALK6. Currently, it is known that many BMPs (BMP2, 4, 5, 6, 7, 8, 14, 15), GDF6, GDF7, and AMH can bind to ALK3 with some affinity to initiate differential downstream action. Global knockout of ALK3 is embryonic lethal. ALK3 is expressed in cells of the osteo lineage and bone marrow and is necessary for post-natal bone formation; as such, it is suggested that the main function of ALK3 is osteogenesis. Mice with conditional knockout of ALK3 in cartilage lack growth of the long bones, however this tissue gets replaced with bone-like tissue, supporting a role of ALK3 in cell fate and osteogenesis. Conditional deletion of Alk3 from osteoblasts produces a similar phenotype. These mice have increased bone formation in the trabecular bone, vertebrae, tail, and ribs, coupled with a reduction in osteoclastogenesis. Unlike ALK2, ALK3 has additional critical roles in development. Deletion of ALK3 in Xenopus results in dorsalized embryos and defects in the eye. Myocardial- and neural crest-specific knockouts of ALK3 show drastic developmental defects. Epicardial-specific deletion of ALK3 in mice results in atypical developmental of the atrioventricular sulcus and annulus fibrosis within the cardia. Additionally, when ALK3 is deleted early (at weaning or early adulthood) from the foregut, mice have improper gastric patterning, as well as a reduced number of parietal cells and increased number of endocrine cells.

Cat. No. Product Name Effect Purity
  • HY-13418A
    Inhibitor 99.91%
    Dorsomorphin (Compound C) is a selective and ATP-competitive AMPK inhibitor (Ki=109 nM in the absence of AMP).
  • HY-13418
    Dorsomorphin dihydrochloride
    Inhibitor 99.91%
    Dorsomorphin dihydrochloride (Compound C dihydrochloride) is a potent, selective and ATP-competitive AMPK inhibitor, with a Ki of 109 nM.
  • HY-12071
    Inhibitor 99.48%
    LDN193189 is a potent selective BMP type I receptor (BMP I) inhibitor.
  • HY-12071A
    LDN193189 Tetrahydrochloride
    Inhibitor 98.04%
    LDN193189 Tetrahydrochloride is a selective BMP type I receptor inhibitor, which efficiently inhibits ALK2 and ALK3 (IC50=5 nM and 30 nM, respectively), with weaker effects on ALK4, ALK5 and ALK7 (IC50≥500 nM).
  • HY-15897
    Inhibitor 99.70%
    LDN-212854 is a bone morphogenetic protein (BMP) inhibitor that potently inhibits ALK2 (IC50: 1.3 nM).
  • HY-123900
    AZ12799734 is a selective, orally active TGFBR1 kinase inhibitor with an IC50 of 47 nM.
  • HY-12274
    Inhibitor 99.89%
    ML347 (LDN193719) is a highly selective ALK1/ALK2 inhibitor.
Cat. No. Product Name / Synonyms Species Source