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-116463B
    (2S,3S)-E1R
    		Agonist 98.24%
    (2S,3S)-E1R (Compound 2d) is an enantiomer of E1R. (2S,3S)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) for the treatment of cognition/memory disorders.
    (2S,3S)-E1R
  • HY-18100AR
    PRE-084 hydrochloride (Standard)
    		Agonist
    PRE-084 (hydrochloride) (Standard) is the analytical standard of PRE-084 (hydrochloride). This product is intended for research and analytical applications. PRE-084 hydrochloride is a highly selective σ1 receptor (S1R) agonist, with an IC50 of 44 nM. PRE-084 hydrochloride exhibits good neuroprotective effects, can improve motor function and motor neuron survival in mice. PRE-084 hydrochloride also can ameliorate myocardial ischemia-reperfusion injury in rats by activating the Akt-eNOS pathway.
    PRE-084 hydrochloride (Standard)
  • HY-W748758
    (Z)-Thiothixene-d8
    (Z)-Thiothixene-d8 (NSC 108165-d8; Navan-d8; Navane-d8) is the deuterium labeled Thiothixene (HY-A0139). Thiothixene is a typical antipsychotic. It selectively binds to dopamine D2 over D1, D3, and D4 receptors (Kis=0.417, 338, 186.2, and 363.1 nM, respectively). Thiothixene also binds to various serotonin (5-HT), histamine H1, α1- and α2-adrenergic, muscarinic acetylcholine, and sigma receptors (Kis=15-5,754 nM) as well as the dopamine, norepinephrine, and serotonin transporters (Kis=3.16-30 μM). In vivo, thiothixene reduces spontaneous and amphetamine-induced locomotor activity in rats. It enhances latent inhibition, as measured by a decreased lick latency in response to light and foot shock stimuli, which is a measure of selective attention in rats.3 Thiothixene also increases competitive behavior in submissive mice, indicating antidepressant-like behavior.
    (Z)-Thiothixene-d<sub>8</sub>
  • HY-131914B
    EST64454 maleate
    		Antagonist
    EST64454 maleate is a highly soluble σ1 receptor antagonist, demonstrating potent antinociceptive properties for pain treatment. EST64454 maleate exhibits excellent metabolic stability across various species and possesses an adequate pharmacokinetic profile in rodents. EST64454 maleate has been identified as a promising clinical candidate due to its favorable aqueous solubility and high permeability in Caco-2 cells.
    EST64454 maleate
  • HY-155614
    KSK68
    		Antagonist
    KSK68 is a high-affinity dual sigma-1 and histamine H3 receptor antagonist, with Kis of 7.7, 3.6, 22.4 nM for H3 receptor, sigma-1, sigma-2 receptor respectively. KSK68 has negligible affinity at the other histamine receptor subtypes. KSK68 can be used for research of nociceptive and neuropathic pain.
    KSK68
  • HY-149335
    Sigma-1 receptor antagonist 5
    		Antagonist
    Sigma-1 receptor antagonist 5 (compound 12)，a 4-pyridylpiperidine derivative with analgesic activity，is an antagonist of sigma receptor (Ki=4.5 nM (σ1R)，10 nM (σ2R)) and histamine H3 (hH3R，Ki=7.7 nM，IC50=215 nM). Sigma-1 receptor antagonist 5 suppresses Capsaicin-induced nociception with antinociceptive activity and shows potent efficacy in nociceptive and neuropathic pain models.
    Sigma-1 receptor antagonist 5
  • HY-155615
    KSK67
    		Antagonist
    KSK67 is a high-affinity dual sigma-2 and histamine H3 receptor antagonist, with Kis of 3.2, 1531, 101 nM for H3 receptor, sigma-1, sigma-2 receptor respectively. KSK67 can be used for research of nociceptive and neuropathic pain.
    KSK67
  • HY-180797
    S1R agonist/BChE-IN-1
    		Agonist
    S1R agonist/BChE-IN-1 (Compound 7c) is a S1R (IC50: 19 nM) agonist and selective BChE (IC50: 37 nM for hBChE) inhibitor. S1R agonist/BChE-IN-1 can be used in the research of Alzheimer's disease.
    S1R agonist/BChE-IN-1
  • HY-163065
    σ1 Receptor/μ Opioid receptor modulator 2
    		Antagonist
    σ1 Receptor/μ Opioid receptor modulator 2 (compound 4x) is a dual μOR agonist/σ1R antagonist, and displays picomolar μOR agonism activity (EC50: 0.6 ± 0.2 nM) and good σ1R inhibitory activity (Ki: 363.7 ± 5.6 nM). σ1 Receptor/μ Opioid receptor modulator 2 exhibits robust analgesic effects in various pain models.
    σ1 Receptor/μ Opioid receptor modulator 2
  • HY-120236
    KSCM-5
    KSCM-5 is a sigma receptor ligand with high affinity activity on sigma-1 receptor. The Ki value of KSCM-5 is about 34nM, showing significant selectivity. KSCM-5 has potential application value in compound development, especially for diseases related to sigma receptors.
    KSCM-5
  • HY-162759
    Sigma-1 receptor antagonist 6
    		Antagonist
    Sigma-1 receptor antagonist 6 (Compound 12) is an antagonist of the Sigma-1 receptor (σ1R). Sigma-1 receptor antagonist 6 exerts a robust antiallodynic effect by antagonizing σ1R. Sigma-1 receptor antagonist 6 can be used in neuropathic pain animal models to alleviate mechanical allodynia induced by paclitaxel (HY-B0015).
    Sigma-1 receptor antagonist 6
  • HY-107708
    threo-Ifenprodil hemitartrate
    		Agonist
    threo Ifenprodil hemitartrate is a σ receptor agonist, with Kis of 59.1 and 2 nM for σ1 and σ2 receptors, respectively. threo Ifenprodil hemitartrate is also a NR2B subunit-selective NMDA receptor antagonist (IC50=0.22 μM). threo Ifenprodil hemitartrate is a hERG potassium channel inhibitor, with an IC 50 of 88 nM, showing antiarrhythmic activity.
    threo-Ifenprodil hemitartrate
  • HY-108511A
    PB28
    		Modulator
    PB28 is a cyclohexylpiperazine derivative and a high affinity and selective sigma 2 (σ2) receptor agonist with a Ki of 0.68 nM. PB28 is also a σ1 antagonist with a Ki of 0.38 nM. PB28 is less affinity for other receptors. PB28 inhibits electrically evoked twitch in guinea pig bladder and ileum with EC50 values of 2.62 μM and 3.96 μM, respectively. PB28 can modulate SARS-CoV-2-human protein-protein interaction. PB28 induces caspase-independent apoptosis and has antitumor activity.
    PB28
  • HY-B1216A
    Oxeladin
    		Agonist
    Oxeladin is an orally active and brain-penetrant cough suppressant as well as a selective sigma 1 receptor agonist (Ki = 25 nM). Oxeladin can be used for pulmonary diseases and stroke research.
    Oxeladin
  • HY-108514
    (±)-PPCC hemioxalate
    		Modulator
    (±)-PPCC hemioxalate is a compound that has the ability to regulate the activity of the sigma-1 receptor. (±)-PPCC hemioxalate can selectively bind sigma-1 protein (s1), and then activate s1 receptor leading to dissociation of s1-BIP complex to regulate ER-mitochondrial calcium signaling, which plays an important role in cell bioenergy and cell survival. (±)-PPCC hemioxalate can be used to study sigma-1 receptors in cocaine addiction, forgetting, pain, depression, Alzheimer's disease, stroke, and cancer.
    (±)-PPCC hemioxalate
  • HY-168562
    σ1 Receptor ligand 1
    σ1 Receptor ligand 1 (compound 5I) is a σ1 receptor ligand with a Ki of 3.9 nM. σ1 Receptor ligand 1 has a high plasma protein binding (89%) and promising metabolic stability in the presence of mouse liver microsomes and NADPH. σ1 Receptor ligand 1 can be utilized in neurological and cancer research.
    σ1 Receptor ligand 1
  • HY-172339
    4-AcO-DALT hydrochloride
    		Inhibitor
    4-AcO-DALT hydrochloride is a tryptamine compound with psychoactive effects. 4-AcO-DALT hydrochloride inhibits 5-HT receptors, alpha receptors, dopamine receptors, histamine receptor 1 (H1), muscarinic M2 receptor and Sigma 2 receptor. 4-AcO-DALT hydrochloride shows Ki values of 582 nM, 2689 nM, 2099 nM, 2116 nM, 958 nM, 137 nM, 824 nM, 479 nM, 406 nM, 874 nM, 4190 nM, 482 nM, 214 nM, 803 nM, 4522 nM, 1907 nM for 5-HT1B, 5-HT1D, 5-HT1E, 5-HT2A, 5-HT2B, 5-HT2C, 5-HT6, 5-HT7A, H1, Sigma 2, α2A, α2B, α2C, D2, D3 receptors.
    4-AcO-DALT hydrochloride
  • HY-101626A
    Sigma ligand-1 hydrochloride
    		99.13%
    Sigma ligand-1 hydrochloride 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 hydrochloride has a Ki of 4000 nM at the dopamine D2 receptor.
    Sigma ligand-1 hydrochloride
  • HY-149274
    Sigma-1 receptor antagonist 4
    		Antagonist
    Sigma-1 receptor antagonist 4 (Compound 32) is a potent σ1R antagonist that significantly enhances the analgesic effect of morphine and rescues morphine-induced analgesic tolerance, with potential to prevent morphine tolerance.
    Sigma-1 receptor antagonist 4
  • HY-164010
    SUN-1334H free base
    		Inhibitor
    SUN-1334H free base is an orally active inhibitor for histamine H1 receptor, with an IC50 of 20.3 nM and Ki of 9.7 nM. SUN-1334H free base inhibits histamine-induced contractions of isolated guinea-pig ileum with an IC50 of 0.198 μM. SUN-1334H free base inhibits histamine-induced bronchoconstriction in guinea pigs, histamine-induced skin wheals in beagle dogs, and ovalbumin-induced rhinitis in guinea pigs.
    SUN-1334H free base
Sigma Receptor Isoform Comparison

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