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Sigma-1 receptor

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The sigma-1 receptor (σ1R), one of two sigma receptor subtypes, is a chaperone protein at the endoplasmic reticulum (ER) that modulates calcium signaling through the IP3 receptor.[5] In humans, the σ1 receptor is encoded by the SIGMAR1 gene.[6][7]

SIGMAR1
Available structures
PDBOrtholog search: PDBe RCSB
Identifiers
AliasesSIGMAR1, ALS16, OPRS1, SIG-1R, SR-BP, SR-BP1, SRBP, hSigmaR1, sigma1R, DSMA2, sigma non-opioid intracellular receptor 1
External IDsOMIM: 601978; MGI: 1195268; HomoloGene: 39965; GeneCards: SIGMAR1; OMA:SIGMAR1 - orthologs
Orthologs
SpeciesHumanMouse
Entrez

10280

18391

Ensembl

ENSG00000147955

ENSMUSG00000036078

UniProt

Q99720

O55242

RefSeq (mRNA)
RefSeq (protein)
Location (UCSC)Chr 9: 34.63 – 34.64 MbChr 4: 41.74 – 41.76 Mb
PubMed search[3][4]
Wikidata
View/Edit HumanView/Edit Mouse

The σ1 receptor is a transmembrane protein expressed in many different tissue types. It is particularly concentrated in certain regions of the central nervous system.[8] It has been implicated in several phenomena, including cardiovascular function, schizophrenia, clinical depression, the effects of cocaine abuse, bipolar disorder, and cancer.[9][10] Much is known about the binding affinity of hundreds of synthetic compounds to the σ1 receptor.

An endogenous ligand for the σ1 receptor has yet to be conclusively identified, but tryptaminergic trace amines and neuroactive steroids have been found to activate the receptor.[11] Especially progesterone, but also testosterone, pregnenolone sulfate, N,N-dimethyltryptamine (DMT) and dehydroepiandrosterone sulfate (DHEA-S) bind to the σ1 receptor.[12]

Characteristics

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The σ1 receptor is defined by its unique pharmacological profile. In 1976 Martin reported that the effects of N-allylnormetazocine (SKF-10,047) could not be due to activity at the μ and κ receptors (named from the first letter of their selective ligands morphine and ketazocine, respectively) and a new type of opioid receptor was proposed; σ (from the first letter of SKF-10,047).[13] The opioid classification was eventually dropped however resulting from it not possessing the canonical opioid G-protein coupled receptor structure and the receptor was later referred to as simply the σ1 receptor. It was found to have affinity for the (+)-stereoisomers of several benzomorphans (e.g., (+)-pentazocine and (+)-cyclazocine), as well as various structurally and pharmacologically distinct psychoactive chemicals such as haloperidol (which permanently blocks this receptor[14]) and cocaine, and neuroactive steroids like progesterone.[15] Pharmacological studies with σ1 agonists often follow a bell-shaped dose-response curve.[16] Thus care should be taken when designing experiments and choosing doses of ligands.

Structure

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The mammalian σ1 receptor is an integral membrane protein with 223 amino acids.[17] It shows no homology to other mammalian proteins but strikingly shares 30% sequence identity and 69% similarity with the ERG2 gene product of yeast, which is a C8-C7 sterol isomerase in the ergosterol biosynthetic pathway. Hydropathy analysis of the σ1 receptor indicates three hydrophobic regions.[18] A crystal structure of the σ1 receptor was published in 2016.[19]

Functions

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A variety of specific physiological functions have been attributed to the σ1 receptor. Chief among these are modulation of Ca2+ release, modulation of cardiac myocyte contractility, and inhibition of voltage gated K+ channels.[20] The reasons for these effects are not well understood, even though σ1 receptors have been linked circumstantially to a wide variety of signal transduction pathways. Links between σ1 receptors and G-proteins have been suggested such as σ1 receptor antagonists showing GTP-sensitive high-affinity binding;[21] there is also, however, some evidence against a G-protein coupled hypothesis.[22] The σ1 receptor has been shown to appear in a complex with voltage gated K+ channels (Kv1.4 and Kv1.5), leading to the idea that σ1 receptors are auxiliary subunits.[23] σ1 receptors apparently co-localize with IP3 receptors on the endoplasmic reticulum[24] where they may be involved in preventing endoplasmic reticulum stress in neurodegenerative diseases.[25] Also, σ1 receptors have been shown to appear in galactoceramide enriched domains at the endoplasmic reticulum of mature oligodendrocytes.[26] The wide scope and effect of ligand binding on σ1 receptors has led some to believe that σ1 receptors are intracellular signal transduction amplifiers.[15]

Recently, σ1R has been implicated in autophagosome formation [27] and maturation.[28] Autophagy is a broad homeostatic, metabolic, cytoplasmic quality control, and metabolic process affecting many functions in the cell.[29] σ1R is targeted by the nsp6 protein of SARS-CoV-2[30][27] to inhibit autophagosome formation [27] as a process competing with the coronavirus for cellular endomembranes that the virus needs for its own replication. This along with the observed beneficial effects of sigma-1 receptor agonist and SSRI fluvoxamine in patients with SARS-COV-2 infection[31] has led to the hypothesis that the sigma-1 receptor could be a target for the treatment of SARS-COV-2.[32]

There has been much interest in the sigma-1 receptor and its role in age-related neurodegenerative diseases such as Alzheimer's disease. During healthy ageing, the density of sigma-1 receptors has been to increase. However, in diseases such as Alzheimer's disease, there appears to be a reduction in sigma-1 receptor expression. It has been suggested that targeting the sigma-1 receptor along with other receptors could increase neuron survival and function in neurodegenerative disease.[16] The activation of autophagy has also been suggested as a downstream mechanism linked to sigma-1 receptor activation.[33]

Knockout mice

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σ1 receptor knockout mice were created in 2003 to study the effects of endogenous DMT. Strangely, the mice demonstrated no overt phenotype.[34] As expected, however, they did lack locomotor response to the σ ligand (+)-SKF-10,047 and displayed reduced response to formalin induced pain. Speculation has focused on the ability of other receptors in the σ family (e.g., σ2, with similar binding properties) to compensate for the lack of σ1 receptor.[34]

Clinical significance

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Mutations in the SIGMAR1 gene have been associated with distal spinal muscular atrophy type 2.[35]

Ligands

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The following ligands have high affinity for the σ1 receptor and possess high binding selectivity over the subtype σ2:[36]

Agonists:

Antagonists:

Positive allosteric modulators (PAMs):

Uncategorized:

  • 4-IPBS
  • PD 144418
  • Spipethiane
  • RHL-033
  • 3-[[1-[(4-chlorophenyl)methyl]-4-piperidyl]methyl]-1,3-benzoxazol-2-one: very high affinity and subtype selectivity[43]
  • 1'-[(4-fluorophenyl)methyl]spiro[1H-isobenzofuran-3,4'-piperidine][44]
  • 1'-benzyl-6-methoxy-1-phenyl-spiro[6H-furo[3,4-c]pyrazole-4,4'-piperidine][45]
  • (−)-(S)-4-methyl-1-[2-(4-chlorophenoxy)-1-methylethyl]piperidine[46]

Agents exist that have high σ1 affinity but either lack subtype selectivity or have high affinity at other binding sites, thus being more or less dirty/multifunctional, like haloperidol. Furthermore, there is a wide range of agents with an at least moderate σ1 involvement in their binding profile.[47][48][49]

See also

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References

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  1. ^ a b c GRCh38: Ensembl release 89: ENSG00000147955 – Ensembl, May 2017
  2. ^ a b c GRCm38: Ensembl release 89: ENSMUSG00000036078 – Ensembl, May 2017
  3. ^ "Human PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  4. ^ "Mouse PubMed Reference:". National Center for Biotechnology Information, U.S. National Library of Medicine.
  5. ^ Hayashi T, Su TP (November 2007). "Sigma-1 receptor chaperones at the ER-mitochondrion interface regulate Ca(2+) signaling and cell survival". Cell. 131 (3): 596–610. doi:10.1016/j.cell.2007.08.036. PMID 17981125. S2CID 18885068.
  6. ^ Kekuda R, Prasad PD, Fei YJ, Leibach FH, Ganapathy V (December 1996). "Cloning and functional expression of the human type 1 sigma receptor (hSigmaR1)". Biochemical and Biophysical Research Communications. 229 (2): 553–558. doi:10.1006/bbrc.1996.1842. PMID 8954936.
  7. ^ Prasad PD, Li HW, Fei YJ, Ganapathy ME, Fujita T, Plumley LH, et al. (February 1998). "Exon-intron structure, analysis of promoter region, and chromosomal localization of the human type 1 sigma receptor gene". Journal of Neurochemistry. 70 (2): 443–451. doi:10.1046/j.1471-4159.1998.70020443.x. PMID 9453537. S2CID 22305479.
  8. ^ Weissman AD, Su TP, Hedreen JC, London ED (October 1988). "Sigma receptors in post-mortem human brains". The Journal of Pharmacology and Experimental Therapeutics. 247 (1): 29–33. PMID 2845055.
  9. ^ Guitart X, Codony X, Monroy X (July 2004). "Sigma receptors: biology and therapeutic potential". Psychopharmacology. 174 (3): 301–319. doi:10.1007/s00213-004-1920-9. PMID 15197533. S2CID 23606712.
  10. ^ Zhang H, Cuevas J (June 2005). "sigma Receptor activation blocks potassium channels and depresses neuroexcitability in rat intracardiac neurons". The Journal of Pharmacology and Experimental Therapeutics. 313 (3): 1387–1396. doi:10.1124/jpet.105.084152. PMID 15764734. S2CID 9704436.
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  25. ^ Brimson JM, Safrany ST, Qassam H, Tencomnao T (August 2018). "Dipentylammonium Binds to the Sigma-1 Receptor and Protects Against Glutamate Toxicity, Attenuates Dopamine Toxicity and Potentiates Neurite Outgrowth in Various Cultured Cell Lines". Neurotoxicity Research. 34 (2): 263–272. doi:10.1007/s12640-018-9883-5. PMID 29589276. S2CID 4378593.
  26. ^ Hayashi T, Su TP (October 2004). "Sigma-1 receptors at galactosylceramide-enriched lipid microdomains regulate oligodendrocyte differentiation". Proceedings of the National Academy of Sciences of the United States of America. 101 (41): 14949–14954. Bibcode:2004PNAS..10114949H. doi:10.1073/pnas.0402890101. PMC 522002. PMID 15466698.
  27. ^ a b c Kumar S, Javed R, Mudd M, Pallikkuth S, Lidke KA, Jain A, et al. (November 2021). "Mammalian hybrid pre-autophagosomal structure HyPAS generates autophagosomes". Cell. 184 (24): 5950–5969.e22. doi:10.1016/j.cell.2021.10.017. PMC 8616855. PMID 34741801.
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  47. ^ EP 1787679, Buschman HH, "Use of compounds binding to the sigma receptor for the treatment of diabetes-associated pain", published 23 May 2007, assigned to Esteve Pharmaceuticals SA 
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  49. ^ Sambo DO, Lebowitz JJ, Khoshbouei H (June 2018). "The sigma-1 receptor as a regulator of dopamine neurotransmission: A potential therapeutic target for methamphetamine addiction". Pharmacology & Therapeutics. 186: 152–167. doi:10.1016/j.pharmthera.2018.01.009. PMC 5962385. PMID 29360540.
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