Spinorphin is a heptapeptide inhibitor of the enkephalin-degrading enzymes aminopeptidase, dipeptidyl aminopeptidase, angiotensin-converting enzyme (ACE), and enkephalinase (IC50s = 3.3, 1.4, 2.4, and 10 ug/ml, respectively, for the monkey brain enzymes).{53716} It is selective for these enzymes over human serum aminopeptidase A (IC50 = >100 ug/ml), as well as porcine kidney aminopeptidase B, aminopeptidase M, dipeptidyl peptidase 1 (DPP-1), DPP-2, DPP-3, and DPP-4 (IC50s = >55 ug/ml for all). Spinorphin inhibits chemotaxis, production of reactive oxygen species (ROS), and exocytosis of glucuronidase and collagenase in polymorphonuclear neutrophils (PMNs). It potentiates enkephalin-induced action potentials in rat hippocampal slices. Spinorphin (5 ug/animal) enhances the antinociceptive effects of Leu-enkephalin (Item No. 23283) in mice.{43324}
500 ug
CAS number
Cayman Chemical
Shipping & storage
Shipping condition
Dry Ice
Storage temperature