Naratriptan hydrochloride  (Synonyms: GR-85548A hydrochloride)

Naratriptan (GR-85548A) hydrochloride is a selective 5-HT1B/1D receptor agonist. Naratriptan hydrochloride is peripherally active and has good oral bioavailability, inducing cranial artery vasoconstriction by activating 5-HT1B/1D receptors (EC₅₀=0.11 μM for dog basilar artery). Naratriptan hydrochloride also inhibits trigeminal nerve-mediated dural neurogenic plasma extravasation and reduces sterile inflammation. Naratriptan hydrochloride is mainly used in the research of acute migraine, targeting cranial vascular and neuroinflammatory mechanisms^[1][2][3][4].

Naratriptan hydrochloride targets human recombinant 5-HT1B and 5-HT1D receptors with K_i of 0.47 nM and 0.69 nM, and EC₅₀ of 4.4 nM and 23 nM, respectively; while for 5-HT1A, K_i=26 nM, EC₅₀=79 nM^[1].
Naratriptan hydrochloride targets 5-HT1B, 5-HT1D, and 5-HT1F with pK_i of 8.7, 8.3, and 8.1, respectively^[2].
Naratriptan hydrochloride can inhibit the discharge response of cat-derived nucleus tractus solitarius (NTS) cells that regulate vomiting by 54%; this activity suggests that Naratriptan hydrochloride has inhibitory activity on NTS in trigeminal nerve vessels and can be used in the study of migraine inhibition^[2].
Naratriptan hydrochloride induces concentration-dependent contraction in isolated dog basilar artery and middle cerebral artery experiments, with EC₅₀ of 0.11 M and 0.07 M, respectively^[3].
Naratriptan hydrochloride induces contraction in isolated human epicardial coronary arteries with an EC₅₀ value of 0.17 μM; the maximal contraction induced at this point is 33% of the maximal 5-HT response^[3].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

Naratriptan (0.1-10 μg/kg; intravenous cannulation; single dose; 15 min before electrical stimulation of the trigeminal ganglion) hydrochloride inhibits plasma protein extravasation in the rat dural neurogenic inflammation model with an ID₅₀ of 4.1 μg/kg^[3].
Naratriptan (10 mg/kg; oral; single dose) hydrochloride has an oral bioavailability of 71% in male Wistar rats. Naratriptan (0.5 mg/kg; oral; single dose) hydrochloride has an oral bioavailability of 95% in beagle dogs^[3].
Contrary to the activity of μ-opioid receptor agonists, Naratriptan [(10, 30 μg/kg; intrathecal injection; single dose) or (10, 30 mg/kg; subcutaneous injection; single dose)] hydrochloride does not increase the latency of the tail flick response or hot plate response in mice in the tail flick test or hot plate test. Neither or Naratriptan (10, 30 mg/kg; subcutaneous injection; single dose) hydrochloride also does not increase the nociceptive paw pressure threshold in the paw pressure test in guinea pigs and rats^[3].
Naratriptan (10 mg/mL; IV/iontophoresis; single dose) hydrochloride inhibits the responses of trigeminal nucleus caudalis neurons to sagittal sinus stimulation in the cat trigeminal neurovascular stimulation model, an effect that can be reversed by the 5-HT_1B/1D receptor antagonists (5 mg/mL) SB224289 (HY-101105) and BRL15572 (HY-13200B)^[4].

MedChemExpress (MCE) has not independently confirmed the accuracy of these methods. They are for reference only.

371.93

C₁₇H₂₆ClN₃O₂S

143388-64-1

Solid

White to off-white

O=S(CCC1=CC2=C(NC=C2C3CCN(C)CC3)C=C1)(NC)=O.Cl

Room temperature in continental US; may vary elsewhere.

-20°C, sealed storage, away from moisture

*In solvent : -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture)

* Please refer to the solubility information to select the appropriate solvent. Once prepared, please aliquot and store the solution to prevent product inactivation from repeated freeze-thaw cycles.
Storage method and period of stock solution: -80°C, 6 months; -20°C, 1 month (sealed storage, away from moisture). When stored at -80°C, please use it within 6 months. When stored at -20°C, please use it within 1 month.

* Note: If you choose water as the stock solution, please dilute it to the working solution, then filter and sterilize it with a 0.22 μm filter before use.

• [1]. Rhoden E, et al. Anti-poliovirus activity of protease inhibitor AG-7404, and assessment of in vitro activity in combination with antiviral capsid inhibitor compounds. Antiviral Res. 2013 May;98(2):186-91.  [Content Brief]

  [2]. Hoskin KL, et al. The 5-hydroxytryptamine1B/1D/1F receptor agonists eletriptan and naratriptan inhibit trigeminovascular input to the nucleus tractus solitarius in the cat. Brain Res. 2004 Feb 13;998(1):91-9.  [Content Brief]

  [3]. Connor HE, et al. Naratriptan: biological profile in animal models relevant to migraine. Cephalalgia. 1997 May;17(3):145-52.  [Content Brief]

  [4]. Donaldson C, et al. The role of 5-HT1B and 5-HT1D receptors in the selective inhibitory effect of naratriptan on trigeminovascular neurons. Neuropharmacology. 2002 Mar;42(3):374-85.  [Content Brief]