2. Signaling Pathways
  3. Neuronal Signaling
  4. Sigma Receptor

Sigma Receptor

Sigma Receptor

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Sigma receptors (subtypes sigma-1 and sigma-2) are a unique class of binding sites expressed throughout the mammalian body. The endogenous ligand for these sites has not been identified, but steroid hormones (particularly progesterone), sphingolipid-derived amines and N,N-dimethyltryptamine can bind with fairly high affinity.

The sigma-1 receptor (σ1R) is an endoplasmic reticulum (ER)-resident chaperone protein that acts like an inter-organelle signaling modulator. It participates in many biological processes including nociception, cancer, stroke, memory, drug addiction, cardiac activity, and Alzheimer’s disease. The sigma-2 (σ2R) receptor is overexpressed in various human tumors. It has been validated as a biomarker for proliferating tumors.

Sigma Receptor Isoform Specific Products:

Sigma Receptor Isoform Comparison
Cat. No. Product Name Effect Purity Chemical Structure
  • HY-113416R
    Dehydroepiandrosterone sulfate (Standard)
    		Activator
    Dehydroepiandrosterone sulfate (DHEA sulfate; Prasterone sulfate) (Standard) is the analytical standard of Dehydroepiandrosterone sulfate (HY-113416). This product is intended for research and analytical applications. Dehydroepiandrosterone sulfate (DHEA sulfate; Prasterone sulfate) is a neurosteroid and the main secretion product of the adrenal gland. Dehydroepiandrosterone sulfate has both non-competitive antagonist activity of GABAA receptor and agonist activity of σ1 receptor. Dehydroepiandrosterone sulfate can partially penetrate the blood-brain barrier, inhibit GABAA receptor-mediated chloride influx, enhance NMDA receptor activity through σ1 receptors, exert anti-inflammatory, anti-glucocorticoid and antidepressant effects, and increase convulsive sensitivity. Dehydroepiandrosterone sulfate participates in neuroprotection, neurite growth regulation and catecholamine secretion regulation, and can be used in the study of depression, post-traumatic stress disorder (PTSD), Alzheimer's disease, etc. Dehydroepiandrosterone sulfate may also be a biomarker for cardiovascular disease mortality, and its concentration is independently and negatively correlated with mortality.
    Dehydroepiandrosterone sulfate (Standard)
  • HY-118901
    Opipramol
    		Antagonist 99.91%
    Opipramol (Ensidon) is an atypical tricyclic antidepressant (TCA). Opipramol acts primarily as a sigma (σ) receptor agonist and can potently interact with sigma recognition sites with a Ki value of 50 nM. Opipramol can be used for the research of generalized anxiety disorder (GAD).
    Opipramol
  • HY-47228
    KB-5492 free base
    		Inhibitor 99.02%
    KB-5492 free base is a potent and selective inhibitor of sigma receptor, inhibits specific [3H]1,3-di(2-tolyl)guanidine (DTG) binding to the sigma receptor with an IC50 of 3.15 μM. KB-5492 free base is an anti-ulcer agent.
    KB-5492 free base
  • HY-101043
    4-PPBP maleate
    		Agonist 99.63%
    4-PPBP maleate is a potent σ 1 receptor ligand and agonist. 4-PPBP maleate is a non-competitive, selective NR1a/2B NMDA receptors (expressed in Xenopus oocytes) antagonist. 4-PPBP maleate provides neuroprotection.
    4-PPBP maleate
  • HY-125819
    Sigma-1 receptor antagonist 2
    		Antagonist 99.76%
    Sigma-1 receptor antagonist 2 is a potent and selective sigma 1 receptor (σ1 R) antagonist with Kis of 3.88 and 1288 nM for σ1 and σ2 receptor, respectively.
    Sigma-1 receptor antagonist 2
  • HY-153091
    BMY 14802
    		Antagonist 98.96%
    BMY 14802 is a sigma-1 receptor (σ1R) antagonist, as well as an agonist at serotonin (5-HT) 1A and adrenergic alpha-1 receptors. BMY 14802 inhibits abnormal involuntary movement (AIM) in rat Parkinson's disease (PD) model, with down-regulating the expression of AIM.
    BMY 14802
  • HY-116594A
    OPC-14523 hydrochloride
    		Inhibitor 99.95%
    OPC-14523 hydrochloride is an orally active sigma and 5-HT1A receptor agonist, with high affinity for sigma receptors (σ1/2 IC50=47/56 nM), the 5-HT1A receptor (IC50=2.3 nM), and the 5-HT transporter (IC50=80 nM). OPC-14523 hydrochloride shows antidepressant-like activity.
    OPC-14523 hydrochloride
  • HY-103412
    SKF 83959 hydrobromide
    		Modulator 99.86%
    SKF83959 hydrobromide is a potent and selective dopamine D1-like receptor partial agonist. SKF83959 hydrobromide Ki values for rat D1, D5, D2 and D3 receptors are 1.18, 7.56, 920 and 399 nM, respectively. SKF83959 hydrobromide is a potent allosteric modulator of sigma (σ)-1 receptor. SKF83959 hydrobromide belongs to benzazepine family and has improvements on cognitive dysfunction. SKF83959 hydrobromide can be used for the research of Alzheimer's disease and depression.
    SKF 83959 hydrobromide
  • HY-101626
    Sigma-LIGAND-1
    		99.67%
    Sigma-LIGAND-1 is a selective sigma receptor ligand with an IC50s of 16 nM, 19 nM at the DTG site and the PPP site, respectively. Sigma-LIGAND-1 has a Ki of 4000 nM at the dopamine D2 receptor.
    Sigma-LIGAND-1
  • HY-116463
    E1R
    		Agonist 99.83%
    E1R is a positive allosteric modulator of sigma-1 receptors (Sig1R PAM) with cognition-enhancing activity.
    E1R
  • HY-149804
    S1R agonist 2
    		Agonist ≥98.0%
    S1R agonist 2 (Compound 8b) is a selective S1R agonist with Kis of 1.1 nM and 88 nM for S1R and S2R, respectively. S1R agonist 2 exhibits neuroprotection against ROS and NMDA-induced neurotoxicity.
    S1R agonist 2
  • HY-141921S
    Dehydroepiandrosterone sulfate sodium-d6
    		Activator 99.61%
    Dehydroepiandrosterone sulfate sodium salt-d6 (DHEA sulfate sodium salt-d6; Prasterone sulfate sodium salt-d6) is the deuterium labeled Dehydroepiandrosterone sulfate sodium salt (HY-B0765). Dehydroepiandrosterone sulfate (DHEA sulfate; Prasterone sulfate) sodium salt is a neurosteroid and the main secretion product of the adrenal gland. Dehydroepiandrosterone sulfate sodium salt has both non-competitive antagonist activity of GABAA receptor and agonist activity of σ1 receptor. Dehydroepiandrosterone sulfate sodium salt can partially penetrate the blood-brain barrier, inhibit GABAA receptor-mediated chloride influx, enhance NMDA receptor activity through σ1 receptors, exert anti-inflammatory, anti-glucocorticoid and antidepressant effects, and increase convulsive sensitivity. Dehydroepiandrosterone sulfate sodium salt participates in neuroprotection, neurite growth regulation and catecholamine secretion regulation, and can be used in the study of depression, post-traumatic stress disorder (PTSD), Alzheimer's disease, etc. Dehydroepiandrosterone sulfate sodium salt may also be a biomarker for cardiovascular disease mortality, and its concentration is independently and negatively correlated with mortality.
    Dehydroepiandrosterone sulfate sodium-d<sub>6</sub>
  • HY-14813
    Cutamesine
    		Agonist
    Cutamesine (SA4503) is a potent and selective sigma 1 receptor agonist with an IC50 of 17.4 nM in guinea pig brain membranes. Cutamesine shows >100-fold less affinity for the sigma 2 receptor (IC50 of 1784 nM). Cutamesine has antidepressant effects.
    Cutamesine
  • HY-124462
    Trifluperidol hydrochloride
    		Antagonist 99.4%
    Trifluperidol hydrochloride is a Sigma-1 receptor antagonist with a Ki value of 3.3 nM. Trifluperidol hydrochloride is used in the study of psychosis.
    Trifluperidol hydrochloride
  • HY-100155
    4-IBP
    		Agonist 98.90%
    4-IBP is a selective σ₁ receptor agonist with high affinity for the σ₁ receptor (Ki =1.7 nM) and moderate affinity for the σ₂ receptor (Ki = 25.2 nM). 4-IBP can make cancer cells more sensitive to the cytotoxic effects of pro-apoptotic and pro-autophagic compounds. 4-IBP significantly reduces the migration ability of a variety of cancer cells. 4-IBP is mainly used in glioblastoma, non-small cell lung cancer and prostate cancer research.
    4-IBP
  • HY-149803
    S1R agonist 1
    		Agonist ≥98.0%
    S1R agonist 1 (Compound 6b) is a selective S1R agonist with Kis of 0.93 nM and 72 nM for S1R and S2R, respectively. S1R agonist 1 exhibits neuroprotection against ROS and NMDA-induced neurotoxicity.
    S1R agonist 1
  • HY-149803A
    S1R agonist 1 hydrochloride
    		Agonist 99.83%
    S1R agonist 1 (Compound 6b) hydrochloride is a selective S1R agonist with Kis of 0.93 nM and 72 nM for S1R and S2R, respectively. S1R agonist 1 hydrochloride exhibits neuroprotection against ROS and NMDA-induced neurotoxicity.
    S1R agonist 1 hydrochloride
  • HY-108512A
    PD 144418 oxalate
    		98.65%
    PD 144418 oxalate is a highly affinity, potent and selective sigma 1 (σ1) receptor ligand (Ki values of 0.08 nM and 1377 nM for σ1 and σ2 respectively). PD 144418 oxalate devoids of any significant affinity for other receptors, ion channels and enzymes. PD 144418 oxalate shows potential antipsychotic activity.
    PD 144418 oxalate
  • HY-19120
    KB-5492 anhydrous
    		Inhibitor 99.50%
    KB-5492 anhydrous is a potent and selective inhibitor of sigma receptor, inhibits specific [3H]1,3-di(2-tolyl)guanidine (DTG) binding to the sigma receptor with an IC50 of 3.15 μM. KB-5492 anhydrous is an anti-ulcer agent.
    KB-5492 anhydrous
  • HY-125820
    Sigma-1 receptor antagonist 3
    		Antagonist 99.47%
    Sigma-1 receptor antagonist 3 (compound135) is a potent and selective Sigma-1 (σ1) receptor antagonist with a Ki of 1.14 nM. Sigma-1 receptor antagonist 3 inhibits Human Ether-a-go-go-Related Gene (hERG) with an IC50 of 1.54 μM. Sigma-1 receptor antagonist 3 has the potential for the neuropathic pain.
    Sigma-1 receptor antagonist 3
Sigma Receptor Isoform Comparison

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