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-108515
    (+)-Igmesine hydrochloride
    		Agonist ≥99.0%
    (+)-Igmesine hydrochloride (JO1784) is an orally active and selective σ receptor ligand with neuroprotective and anti-amnesic activities.
    (+)-Igmesine hydrochloride
  • HY-116594
    OPC-14523 free base
    		Agonist
    OPC-14523 free base 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 free base shows antidepressant-like activity.
    OPC-14523 free base
  • HY-134189A
    EST73502 monohydrochloride
    		Antagonist 99.58%
    EST73502 monohydrochloride is a selective, orally active and blood-brain barrier (BBB) penetrant dual μ-opioid receptor (MOR) agonist and σ1 receptor (σ1R) antagonist, with Kis of 64 nM and 118 nM for MOR and σ1R, respectively. EST73502 monohydrochloride has antinociceptive activity.
    EST73502 monohydrochloride
  • HY-14221
    Siramesine
    		Agonist
    Siramesine (Lu 28-179) is a potent sigma-2 receptor agonist. Siramesine has a subnanomolar affinity for sigma-2 receptors (IC50=0.12 nM) and exhibits a 140-fold selectivity for sigma-2 receptors over sigma-1 receptors (IC50=17 nM). Siramesine triggers cell death through destabilisation of mitochondria, but not lysosomes. Anti-cancer activity.
    Siramesine
  • HY-13751A
    SR-31747 free base
    SR-31747 free base is a sigma ligand with immunosuppressive and anti-inflammatory properties. SR-31747 blocks cell proliferation by inhibiting sterol isomerase.
    SR-31747 free base
  • HY-13575A
    Blonanserin dihydrochloride
    		Antagonist
    Blonanserin dihydrochloride is a potent and orally active 5-HT2A and dopamine D2 receptor antagonist, with Ki values of 0.812 and 0.142 nM, respectively. Blonanserin dihydrochloride is usually acts as an atypical antipsychotic agent, and can be used for the research of extrapyramidal symptoms, excessive sedation, or hypotension.
    Blonanserin dihydrochloride
  • HY-116586
    AF710B
    		Agonist
    AF710B is a highly potent and selective allosteric M1 muscarinic and σ1 receptor agonist. AF710B can be used for the research of Alzheimer’s disease.
    AF710B
  • HY-123408
    Umespirone
    Umespirone (KC 9172) is a potential antipsychotic/antianxiety agent.
    Umespirone
  • HY-14221B
    Siramesine fumarate
    		Agonist
    Siramesine (Lu 28-179) fumarate is a potent sigma-2 receptor agonist. Siramesine fumarate has a subnanomolar affinity for sigma-2 receptors (IC50=0.12?nM) and exhibits a 140-fold selectivity for sigma-2 receptors over sigma-1 receptors (IC50=17?nM). Siramesine fumarate triggers cell death through destabilisation of mitochondria, but not lysosomes. Anti-cancer activity.
    Siramesine fumarate
  • HY-163075
    SYB4
    SYB4 (compound 5) is a PET tracer which suitable for imaging the Sigma-2 Receptor in the brain of nonhuman primates.
    SYB4
  • HY-158197
    RC-106
    		Inhibitor
    RC-106 is a proteasome inhibitor (IC50: 35 μM) and Sigma receptor modulator with anticancer activity. RC-106 has antiproliferative activity against cancer cells including glioblastoma (GB) and multiple myeloma (MM).
    RC-106
  • HY-149855
    AB10
    		Antagonist
    AB10 is a selective S1R antagonist. AB10 with Ki of 10, 165 nM for S1R and S2R, respectively. AB10 reverses the effect of Capsaicin (HY-10448) caused pain in model.
    AB10
  • HY-155616
    KSK94
    		Antagonist
    KSK94 is a high-affinity histamine H3 receptor antagonist, with Kis of 7.9, 2958, 75.2 nM for H3 receptor, sigma-1, sigma-2 receptor respectively. KSK94 can be used for research of nociceptive and neuropathic pain.
    KSK94
  • HY-147560
    σ1 Receptor/μ Opioid receptor modulator 1
    		Antagonist
    σ1 Receptor/μ Opioid receptor modulator 1 (Compound 44) is a potent σ1 receptor antagonist and μ opioid receptor agonist with Kis of 1.86 nM and 2.1 nM, respectively.σ1 Receptor/μ Opioid receptor modulator 1 exhibits potent analgesic activity. σ1 Receptor/μ Opioid receptor modulator 1 can be used for the research of neuropathic pain.
    σ1 Receptor/μ Opioid receptor modulator 1
  • HY-RS12910
    Sigmar1 Rat Pre-designed siRNA Set A
    		Inhibitor

    Sigmar1 Rat Pre-designed siRNA Set A contains three designed siRNAs for Sigmar1 gene (Rat), as well as a negative control, a positive control, and a FAM-labeled negative control.
    Sigmar1 Rat Pre-designed siRNA Set A
    Sigmar1 Rat Pre-designed siRNA Set A
  • HY-131914
    EST64454
    		Antagonist
    EST64454 (compound 9k) is a selective, orally active sigma-1 receptor antagonist with Ki 22 nM. EST64454 can be used to study pain.
    EST64454
  • HY-121867
    KSCM-11
    KSCM-11 is a ligand of thesigma receptor.
    KSCM-11
  • HY-100930
    L-693403 maleate
    L-693403 maleate is a high affinity and selective σ ligand. L-693403 maleate has the potential for physiological disease research.
    L-693403 maleate
  • HY-155155
    SARS-CoV-2-IN-57
    SARS-CoV-2-IN-57 (compound (+)-R-26) is a potent inhibitor of SARS-CoV-2 (IC50: 80 nM). SARS-CoV-2-IN-57 has high affinity for Sigma Receptor with Kis of 13.6 nM (S1R) and 14.4 nM (S2R) respectively.
    SARS-CoV-2-IN-57
  • HY-116586A
    (Rac)-AF710B
    		Agonist
    (Rac)-AF710B is the racemate of AF710B (HY-116586). AF710B is a highly potent and selective allosteric M1 muscarinic and σ1 receptor agonist. AF710B can be used for the research of Alzheimer’s disease.
    (Rac)-AF710B
Sigma Receptor Isoform Comparison

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