1. GPCR/G Protein
    Neuronal Signaling
  2. 5-HT Receptor
  3. AP521


Cat. No.: HY-100166
Handling Instructions

AP521 is an agonist of human 5-HT1A receptor with an IC50 of 94 nM.

For research use only. We do not sell to patients.

AP521 Chemical Structure

AP521 Chemical Structure

CAS No. : 151227-08-6

Size Price Stock
1 mg USD 1315 Get quote
5 mg USD 2104 Get quote
10 mg USD 3366 Get quote

* Please select Quantity before adding items.

Top Publications Citing Use of Products
  • Biological Activity

  • Protocol

  • Technical Information

  • Purity & Documentation

  • References


AP521 is an agonist of human 5-HT1A receptor with an IC50 of 94 nM.

IC50 & Target

IC50: 94 nM (5-HT1A (human))[1]

In Vitro

AP521 is an agonist of human 5-HT1A receptor with IC50s of 135, 94, 254, 5530, 418, 422 and 198 nM for 5-HT1A (rat), 5-HT1A (human), 5-HT1B (rat), 5-HT1B (human), 5-HT1D (human), 5-HT5a (human) and 5-HT7 (rat), respectively. AP521 also decreases the forskolin-induced cAMP accumulation from 10 nM to 10 μM[1].

In Vivo

AP521 significantly increases the number of shock acceptances [F(5,105)=4.46, P<0.01] at doses between 0.5 to 10 mg/kg. Oral administration of AP521 at 3 and 10 mg/kg significantly decreases freezing time [F(3,60)=2.89, P<0.05]. AP521 significantly increases the time spent on the open arms by approximately 2-fold as compare to the vehicle treated group [F(3, 36)=4.21, P<0.05 for AP521]. The anxiolytic-like effect of AP521 appears to be dose-related. AP521 significantly increases the extracellular 5-HT level of the medial prefrontal cortex (mPFC) at 10 mg/kg from 0.5 to 1 h after administration. AP521 at 3 mg/kg tends to increase the extracellular 5-HT level, however, this increase is not significant[1].


Please store the product under the recommended conditions in the Certificate of Analysis.

Cell Assay

Membranes of neurotransmitter receptors are prepared from the tissues of rat, mouse, and guinea pig or from recombinant cells. These membranes are incubated in assay buffers containing selective radioligand for each receptor and AP521. After the incubation, the mixture is vacuum filtered through a glass membrane filter and washed by cold reaction buffer. Afterward, the radioactivity of the filters is counted[1].

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

Animal Administration

Male Sprague-Dawley rats weighing 250 to 300 g are anesthetized with pentobarbital sodium (50 mg/kg, i.p.) and placed on a stereotaxic apparatus. Dialysis probes with an outer diameter of 0.105 mm are inserted into the guide cannulae so that 3.0 mm of the probes are exposed to the tissue of the medial prefrontal cortex. Rats are housed individually after these operations. On the following day, perfusion is started in the home cage using artificial cerebrospinal fluid (145 mM NaCl, 3.0 mM KCl, 1.3 mM CaCl2, 1.0 mM MgCl2) at a flow rate of 2 mL/min. AP521 (3, 10 mg/kg), tandospirone (10 mg/kg) or vehicle are administered subcutaneously 60 min after sample collection started. The dialysate samples are collected every 30 min for 180 min and extracellular levels of 5-HT are determined[1].

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

Molecular Weight







O=C([[email protected]]1CC(C2=CC=CC=C2S3)=C3CN1)NCC4=CC=C(OCO5)C5=C4.[H]Cl


Room temperature in continental US; may vary elsewhere

  • Molarity Calculator

  • Dilution Calculator

The molarity calculator equation

Mass (g) = Concentration (mol/L) × Volume (L) × Molecular Weight (g/mol)

Mass   Concentration   Volume   Molecular Weight *
= × ×

The dilution calculator equation

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)

This equation is commonly abbreviated as: C1V1 = C2V2

Concentration (start) × Volume (start) = Concentration (final) × Volume (final)
× = ×
C1   V1   C2   V2

Inquiry Online

Your information is safe with us. * Required Fields.

Product name



Applicant name *


Email address *

Phone number *


Organization name *

Country or Region *


Requested quantity *


Bulk Inquiry

Inquiry Information

Product Name:
Cat. No.:


Cat. No.: HY-100166