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-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-RS12909
    Sigmar1 Mouse Pre-designed siRNA Set A
    		Inhibitor

    Sigmar1 Mouse Pre-designed siRNA Set A contains three designed siRNAs for Sigmar1 gene (Mouse), as well as a negative control, a positive control, and a FAM-labeled negative control.
    Sigmar1 Mouse Pre-designed siRNA Set A
    Sigmar1 Mouse Pre-designed siRNA Set A
  • 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-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-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
  • HY-116463D
    (Rac)-E1R
    		Agonist 98.48%
    (Rac)-E1R (Compound 2) is the racemate of E1R. (Rac)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) used for the research of cognition/memory disorders.
    (Rac)-E1R
  • HY-151951
    Antidepressant agent 4
    Antidepressant agent 4 is an orally active antidepressant agent. Antidepressant agent 4 exhibits antidepressant, anxiolytic, performance enhancing and nootropic activities.
    Antidepressant agent 4
  • HY-116463A
    (2R,3S)-E1R
    		Agonist 98.84%
    (2R,3S)-E1R (Compound 2c) is an enantiomer of E1R. (2R,3S)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) for the treatment of cognition/memory disorders.
    (2R,3S)-E1R
  • HY-RS12908
    SIGMAR1 Human Pre-designed siRNA Set A
    		Inhibitor

    SIGMAR1 Human Pre-designed siRNA Set A contains three designed siRNAs for SIGMAR1 gene (Human), as well as a negative control, a positive control, and a FAM-labeled negative control.
    SIGMAR1 Human Pre-designed siRNA Set A
    SIGMAR1 Human Pre-designed siRNA Set A
  • HY-161873
    PW507
    		Antagonist
    PW507 is a potent, brain-penetrant and selective sigma 1 receptor (S1R) antagonist with a Ki of 7.5 nM for human S1R. PW507 displays a low binding affinity to S2R and hERG. PW507 can be used for the study of painful diabetic neuropathy (PDN).
    PW507
  • HY-117420
    CM764
    		Activator
    CM764 is an activator for sigma receptor with Ki of 86.6 and 3.5 nM for sigma-1 receptor and sigma-2 receptor. CM764 increases cytoplasmic calcium, NAD+/NADH, and ATP levels, and decreases the concentration of ROS.
    CM764
  • HY-135608
    BD-1008
    		Antagonist
    BD-1008 is a selective antagonist of the sigma receptors, demonstrating a binding affinity of K? = 2 ± 1 nM for the sigma-1 receptor and exhibiting fourfold selectivity over the sigma-2 receptor.
    BD-1008
  • HY-149854A
    AB21 oxalate
    		Antagonist
    AB21 oxalate is a potent and selective S1R antagonist with Kis of 13, 102 nM for S1R and S2R. AB21 oxalate has the effect of reducing mechanical hypersensitivity.
    AB21 oxalate
  • HY-116463C
    (2R,3R)-E1R
    		Agonist 98.79%
    (2R,3R)-E1R (Compound 2b) is an enantiomer of E1R. (2R,3R)-E1R is a sigma-1 receptor positive allosteric modulator (Sig1R PAM) for the treatment of cognition/memory disorders.
    (2R,3R)-E1R
  • HY-118901A
    Opipramol dihydrochloride
    		Antagonist
    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 dihydrochloride
Sigma Receptor Isoform Comparison

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