Uses
LY2444296 is an orally bioavailable, high-affinity and selective short-acting kappa opioid receptor (KOPR) antagonist, with a Ki value of ～1 nM. LY2444296 exhibits anti-anxiety like effects[1][2].
Biological Activity
LY2444296 is a brain-penetrant, orally active, short-acting, high-affinity, potent and selective K (kappa) opioid receptor (KOR) antagonist (human K/μ/δ Ki = 0.565/35.8/211 nM against diprenorphine binding; GTP-γ-S binding IC50/agonist/subtype transfectant = 1.57 nM/300 nM U69593/K, 21.3 nM/1 μM DAMGO/μ 293 nM/30 nM DPDPE/d). LY2444296 reverses K agonist antinociceptive efficacy in vivo (ED50 = 0.24 mg/kg p.o. against 1 mg/kg U69593 sc. by r at formalin test), decreases immobility time (10 or 30 mg/kg sc.) and prevents enhanced alcohol consumption (5 mg/kg i.p.) among mice subjected to stress by forced swimming.
in vivo
LY2444296 displays anti-anxiety like effects in the EPM test[1].
LY2444296 (3 mg/kg; i.p.; 30 min before U69,593 administration) prevents behavioral and neuroendocrine effects caused by the reference kappa agonist U69,593 in cocaine-nave rats[2].
LY2444296 reduces anxiety-like and depressive-like behaviors, as well as CORT release, in rats tested after chronic extended access cocaine self-administration, but not in cocaine-nave rats[2].
| Animal Model: | Adult male Sprague Dawley rats (240–250 g)[2] |
| Dosage: | 3 mg/kg |
| Administration: | Injected intraperitoneally; 30 min before U69,593 administration |
| Result: | Prevented behavioral and neuroendocrine effects caused by U69,593 in cocaine-nave rats. |
IC 50
κ Opioid Receptor/KOR
References
[1] Huang P, et al. Two short-acting kappa opioid receptor antagonists (zyklophin and LY2444296) exhibited different behavioral effects from the long-acting antagonist norbinaltorphimine in mouse anxiety tests. Neurosci Lett. 2016 Feb 26;615:15-20. DOI:
10.1016/j.neulet.2016.01.017[2] Valenza M, et al. "Effects of the novel relatively short-acting kappa opioid receptor antagonist LY2444296 in behaviors observed after chronic extended-access cocaine self-administration in rats". Psychopharmacology (Berl). 2017 Aug;234(15):2219-2231. DOI:
10.1007/s00213-017-4647-0
