CTOP

Cat. No. 1578

CTOP D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (Disulfide bridge: 2 - 7)

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Biological Activity

Potent and selective μ opioid receptor antagonist (Ki values are 0.96 and >10,000 nM for μ and δ receptors respectively). Causes behavioral effects on central administration in vivo. Also increases K+ currents in rat locus ceruleus neurons in vitro via a μ receptor independent mechanism.

Technical Data

M.Wt:
1062.28
Formula:
C50H67N11O11S2
Sequence:
FCYWXTXT

(Modifications: Phe-1 = D-Phe, Trp-4 = D-Trp, X-5 = Orn, X-7 = Pen, Disulfide bridge between 2 - 7, Thr-8 = C-terminal amide)

Solubility:
Soluble to 1 mg/ml in water
Storage:
Desiccate at -20°C
CAS No:
103429-31-8

The technical data provided above is for guidance only. For batch specific data refer to the Certificate of Analysis.
All Tocris products are intended for laboratory research use only.

Certificate of Analysis / Safety Data Sheet

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Chieng et al (1996) The μ-opioid receptor antagonist D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (CTOP) [but not D-Phe-Cys-Tyr-D-Trp-Arg-Thr-Pen-Thr-NH2 (CTAP)] produces a nonopioid receptor-mediated increase in K+ conductance of rat locus ceruleus neurons. Mol.Pharmacol. 50 650. PMID: 8794906.

Badiani et al (1995) Intra-VTA injections of the mu-opioid antagonist CTOP enhance locomotor activity. Brain Res. 690 112. PMID: 7496796.

Hawkins et al (1989) [3H]-[H-D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2] ([3H]CTOP), a potent and highly selective peptide for mu opioid receptors in rat brain. J.Pharmacol.Exp.Ther. 248 73. PMID: 2563293.

Gulya et al (1988) Central effects of the potent and highly selective mu opioid antagonist D-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (CTOP) in mice. Eur.J.Pharmacol. 150 355. PMID: 2901358.

If you know of a relevant reference for this product please let us know.

Citations are publications that use Tocris products. Selected citations for CTOP include:

Gerhold et al (2015) Pronociceptive and Antinociceptive Effects of Buprenorphine in the Spinal Cord Dorsal Horn Cover a Dose Range of Four Orders of Magnitude. J Neurosci 35 9580. PMID: 26134641.

Do you know of a great paper that uses CTOP from Tocris? If so please let us know.

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Keywords: CTOP, supplier, selective, potent, μ-opioid, mu-opioid, antagonists, MOP, Receptors, OP3, Tocris Bioscience, μ Opioid Receptor Antagonist products

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