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-158693
    WLB-87848
    		Agonist
    WLB-87848 is a selective, orally active, and blood-brain barrier (BBB) permeable σ1 receptor agonist with the Ki of 9 nM. WLB-87848 rescues recognition memory impairment.
    WLB-87848
  • HY-B1055R
    Pentoxyverine citrate (Standard)
    		Agonist
    Pentoxyverine (citrate) (Standard) is the analytical standard of Pentoxyverine (citrate). This product is intended for research and analytical applications. Pentoxyverine (Carbetapentane) citrate is an orally active sigma-1 receptor agonist, with Kis of 41 nM, 894 nM and 75 nM for σ1, σ2 and guinea-pig brain membrane σ1, respectively. Pentoxyverine citrate is a muscarinic antagonist. Pentoxyverine citrate is a potent antitussive, anticonvulsant, and spasmolytic agent. Pentoxyverine citrate can be used for inhibiting bronchial interceptor, weakening of cough reflex, bronchial smooth muscle relaxation and reduction of airway resistance[4].
    Pentoxyverine citrate (Standard)
  • HY-111081C
    (±)-PPCC oxalate
    		Agonist
    (±)-PPCC oxalate is a sigma-1 agonist that mainly interacts with sigma-1 receptors with Ki of 1.5 nM. (±)-PPCC oxalate has effective anti-amnesia effects in rats with mild or severe cognitive impairment, and can improve the cognitive abilities of rats.
    (±)-PPCC oxalate
  • HY-A0172
    Captodiame
    		Agonist
    Captodiame (Captodiamine) is a 5-HT2c receptor antagonist and sigma-1 and D3 dopamine receptor agonist. Captodiame shows antidepressant effect.
    Captodiame
  • HY-14222
    UMB24
    		Antagonist
    UMB24 is a potent antagonist of σ2 receptor, with Ki values of 170 nM anf 322 nM for σ2 receptor and σ1 receptor, respectively. UMB24 attenuats cocaine-induced convulsions and locomotor activity, but not lethality.
    UMB24
  • HY-156124
    Sigma-2 Radioligand 1
    Sigma-2 Radioligand 1 (compound 1) is a Sigma-2 selective ligand. Sigma-2 Radioligand 1 has good biodistribution in mice and good in vivo activity in rats. [18F] Modified Sigma-2 Radioligand 1 for visualization of tumors in micro-PET/CT imaging, exhibiting high tumor uptake and tumor-to-background ratio. Experiments show that Sigma-2 Radioligand 1 binds highly specifically in U87MG glioma xenografts.
    Sigma-2 Radioligand 1
  • HY-B0765R
    Dehydroepiandrosterone sulfate sodium (Standard)
    		Activator
    Dehydroepiandrosterone sulfate (DHEA sulfate; Prasterone sulfate) sodium salt (Standard) is the analytical standard of Dehydroepiandrosterone sulfate sodium salt (HY-B0765). 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 sodium (Standard)
  • HY-14220
    CB-184
    CB-184 is a selective ligand for sigma-2 (σ2), with Ki values of 7436 nM for σ1 and 13.4 nM for σ2. CB-184 promotes apoptosis and has antitumor activity.
    CB-184
  • HY-149804A
    S1R agonist 2 hydrochloride
    		Agonist ≥98.0%
    S1R agonist 2 (Compound 8b) hydrochloride is a selective S1R agonist with Kis of 1.1 nM and 88 nM for S1R and S2R, respectively. S1R agonist 2 hydrochloride exhibits neuroprotection against ROS and NMDA-induced neurotoxicity.
    S1R agonist 2 hydrochloride
  • HY-16996
    BD-1047
    		Antagonist
    BD-1047 is a selective functional antagonist of sigma receptors. BD-1047 attenuates Apomorphine (HY-12723)-induced climbing and Phencyclidine-induced head twitches.
    BD-1047
  • HY-120155
    MS-377
    		Ligand
    MS-377 is a selective and orally active sigma-1 receptor ligand (Ki=73 nM) with weak affinity for sigma-2 receptor (Ki=6900 nM) and no affinity for any other receptors including dopamine, serotonin, PCP site, glutamate, γ-aminobutylic acid, adenosine, adrenergic receptors, etc. (Ki: >10 μM). MS-377 indirectly modulates the NMDA receptor ion-channel complex. MS-377 is a antipsychotic agent. MS-377 inhibits PCP-induced behaviors by inhibition of the increase in dopamine and serotonin release in the rat medial prefrontal cortex. MS-377 can be used for research of schizophrenia.
    MS-377
  • HY-178945
    KOR agonist 7
    		Agonist
    KOR agonist 7 (Compound 29) is a highly selective κ-opioid receptor (KOR) agonist with a Ki of 138 nM. KOR agonist 7 shows no activity at μ- and δ-opioid receptors or σ1 receptor, and exhibits extremely low affinity for σ2 receptor (Ki = 2.8 μM). KOR agonist 7 significantly reduces the secretion of pro-inflammatory cytokines such as IL-6, TNF-α, and IFN-γ, while increasing the production of the anti-inflammatory cytokine IL-10. KOR agonist 7 downregulates the expression of the pro-inflammatory M1 macrophage marker CD80 and upregulates the anti-inflammatory M2 macrophage marker CD163. KOR agonist 7 holds potential for applications in analgesia and immune modulation.
    KOR agonist 7
  • HY-134189
    EST73502
    		Antagonist
    EST73502 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 has antinociceptive activity.
    EST73502
  • HY-116586
    AF710B
    		Agonist
    AF710B is an orally effective allosteric agonist for the M1 muscarinic receptor and σ1 receptor. AF710B activates the downstream phosphorylated ERK1/2 and phosphorylated CREB signaling pathways. AF710B simultaneously improves cognitive function and alleviates the core pathological features of Alzheimer's disease, including Aβ deposition, excessive Tau phosphorylation and neuroinflammation. AF710B is applicable to the research of Alzheimer's disease.
    AF710B
  • HY-122112
    CM572
    		Agonist
    CM572 is a selective irreversible partial sigma-2 receptor agonist. CM572 has antitumor activity. CM572 induces dose-dependent cell death, with an EC50 of 7.6 μM in SK-N-SH neuroblastoma cells. CM572 can be used for the research of kinds of diseases such as neuroblastoma, breast cancer.
    CM572
  • HY-116968
    JVW-1009
    		Antagonist
    JVW-1009 is a Sig2R/PGRMC1 antagonist (Sig1R Ki = 96 nM; Sig2R Ki = 70 nM). JVW-1009 acts as a neuroprotective agent. JVW-1009 can be used in the research of Alzheimer's disease.
    JVW-1009
  • HY-B1733
    Phenyltoloxamine
    		Modulator
    Phenyltoloxamine (Bistrimin) is an antihistamine agent with sedative and analgesic effects. Phenyltoloxamine also has potent Sigma-1 receptor binding affinity (Ki: 160 nM).
    Phenyltoloxamine
  • HY-18100
    PRE-084
    		Agonist
    PRE-084 is a highly selective σ1 receptor (S1R) agonist, with an IC50 of 44 nM. PRE-084 exhibits good neuroprotective effects, can improve motor function and motor neuron survival in mice. PRE-084 also can ameliorate myocardial ischemia-reperfusion injury in rats by activating the Akt-eNOS pathway.
    PRE-084
  • HY-149853
    AD186
    		Agonist
    AD186 is a potent and selective S1R agonist with Kis of 2.7, 27 nM for S1R and S2R, respectively. AD186 fully reverses the antiallodynic effect of BD-1063 (HY-18101A).
    AD186
  • HY-120421
    SW116 free base
    SW116 free base is a selective fluorescent ligand for sigma-2 receptor with a Ki of 14 nM. SW116 free base exhibits in methanol a maximal excitation wavelength of 333 nM, and a maximal emission wavelength of 506 nM. SW116 free base can be internalized into MDA-MB-435 cells, and reach 50% maximum fluorescent intensity in 24 minutes. SW116 free base can be as a fluorescent probe used in cancer research.
    SW116 free base
Sigma Receptor Isoform Comparison

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