Opn4 Antagonist

A sulfonamide compound that prevents melanopsin/Opn4 photoactivation in a reversible and cis-Retinal-competitive manner (K_b = 6 and 0.16 µM in competitive binding studies using Opn4 pre-bound with cis-Retinal or not) without apparent affinity toward bovine retina rhodopsin or a panel of 74 other receptors, ion channels, and enzymes. Effectively inhibits cellular phototransduction mediated by human Opn4 in CHO transfectants (IC₅₀ = 665 nM; drug added 30 min before 10 µM 9-cis-Retinal & photoactivation), by murine Opn4 in transfected Xenopus oocytes (IC₅₀ = 190 nM; drug added 3 min before 50 µM 11-cis-Retinal and photoactivation), as well as by endogenous Opn4 in primary rat ipRGCs (intrinsically photosensitive retinal ganglion cells; 10 µM). Shown to be bioavailable in mice via i.p. injection (retina [AA92593] ~7.5 µM 30 min post 30 mg/kg i.p. dosing; >95% clearance within 2 h) and effectively suppress PLR (pupillary light reflex; pupil constriction) in a time- and Opn4-dependent manner in mice in vivo. Likewise, blue light insensitivity is observed in Opn4^-/- and AA92593-treated wild-type, but not vehicle-treated wild-type, P14 neonatal mice.

A sulfonamide compound that prevents melanopsin/Opn4 photoactivation in a reversible and cis-Retinal-competitive manner without apparent affinity toward bovine retina rhodopsin or a panel of 74 other receptors, ion channels, and enzymes. Effectively inhibits cellular phototransduction mediated by human Opn4 (IC₅₀ = 665 nM; using CHO transfectants), murine Opn4 (IC₅₀ = 190 nM; using transfected Xenopus oocytes), and rat Opn4 (10 µM; using primary rat ipRGCs). Shown to effectively suppress PLR (pupillary light reflex; pupil constriction) in a time- and Opn4-dependent manner in mice (30 mg/kg i.p.) in vivo. Likewise, blue light insensitivity is observed in Opn4^-/- and AA92593-treated wild-type, but not vehicle-treated wild-type, P14 neonatal mice.

Cell permeable: yes

Primary Target
melanopsin (Opn4)

Reversible: yes

Target K_i: 110 and 160 nM for human and mouse melanopsin, respectively)

Packaged under inert gas

Toxicity: Regulatory Review (Z)

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 monthst at -20°C.

Jones, K.A., et al. 2013. Nat. Chem. Biol.9, 630.

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany