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The molecular basis of analgesia in congenital insensitivity to pain associated with loss of Nav1.7 function

ABSTRACT: Loss of function mutations in the SCN9a gene encoding voltage-gated sodium channel Nav1.7 cause congenital insensitivity to pain (CIP) and anosmia in otherwise normal humans and mice, suggesting that this channel may be a good analgesic drug target. Surprisingly, potent selective antagonists of Nav1.7 are weak analgesics. We therefore investigated whether Nav1.7 , as well as contributing to electrical signalling may have an additional function. Here we report that Nav1.7 deletion has profound effects on the sensory neuron transcriptome, leading to dysregulation of a number of transcription factors as well as upregulation of enkephalin precursor PENK mRNA and down regulation of CEACAM10 mRNA, a protein involved in noxious thermosensation. PENK mRNA is transcriptionally upregulated in Nav1.7 null mutant female sensory neurons, resulting in increased enkephalin expression in the dorsal horn of the spinal cord. PENK expression is down-regulated by addition of the sodium ionophore monensin, suggesting that sodium may play a role as a second messenger. Application of the opioid antagonist naloxone strongly enhances noxious peripheral input into the spinal cord, and dramatically reduces analgesia in both male and female Nav1.7 null mutant mice, as well as in human Nav1.7 null mutants. These data show that loss of Nav1.7 expression increases opioid drive over the lifetime of mice and humans. They further suggest that Nav1.7 channel blockers alone may not replicate the phenotype of null mutant humans and mice, but should be potentiated with exogenous opioids.

ORGANISM(S): Mus musculus

PROVIDER: GSE61373 | GEO | 2014/09/13

SECONDARY ACCESSION(S): PRJNA260894

REPOSITORIES: GEO

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The molecular basis of analgesia in congenital insensitivity to pain associated with loss of Nav1.7 function

Project description:Loss of function mutations in the SCN9a gene encoding voltage-gated sodium channel Nav1.7 cause congenital insensitivity to pain (CIP) and anosmia in otherwise normal humans and mice, suggesting that this channel may be a good analgesic drug target. Surprisingly, potent selective antagonists of Nav1.7 are weak analgesics. We therefore investigated whether Nav1.7 , as well as contributing to electrical signalling may have an additional function. Here we report that Nav1.7 deletion has profound effects on the sensory neuron transcriptome, leading to dysregulation of a number of transcription factors as well as upregulation of enkephalin precursor PENK mRNA and down regulation of CEACAM10 mRNA, a protein involved in noxious thermosensation. PENK mRNA is transcriptionally upregulated in Nav1.7 null mutant female sensory neurons, resulting in increased enkephalin expression in the dorsal horn of the spinal cord. PENK expression is down-regulated by addition of the sodium ionophore monensin, suggesting that sodium may play a role as a second messenger. Application of the opioid antagonist naloxone strongly enhances noxious peripheral input into the spinal cord, and dramatically reduces analgesia in both male and female Nav1.7 null mutant mice, as well as in human Nav1.7 null mutants. These data show that loss of Nav1.7 expression increases opioid drive over the lifetime of mice and humans. They further suggest that Nav1.7 channel blockers alone may not replicate the phenotype of null mutant humans and mice, but should be potentiated with exogenous opioids. RNA was extracted from Dorsal Root Ganglia tissue from Nav1.7 Knock-Out, Nav1.8 KO and Nav1.9 KO mice (n = 3) and hybridised on Affymetrix Mouse Genome 430 2.0 Array (GPL1261)

2014-09-13 | E-GEOD-61373 | biostudies-arrayexpress

Long-lasting Analgesia via Targeted in situ Repression of NaV1.7

Project description:Current treatments for chronic pain rely largely on opioids despite their significant side effects and risk of addiction. Genetic studies have identified in humans key targets pivotal to nociceptive processing. In particular, a hereditary loss-of-function mutation in NaV1.7, a sodium channel protein associated with signaling in nociceptive sensory afferents, leads to insensitivity to pain without other neurodevelopmental alterations. However, the high sequence and structural similarity between NaV subtypes has frustrated efforts to develop selective inhibitors. Here, we investigated targeted epigenetic repression of NaV1.7 in primary afferents via epigenome engineering approaches based on clustered regularly interspaced short palindromic repeats (CRISPR)-dCas9 and zinc finger proteins at the spinal level as a potential treatment for chronic pain. Towards this end, we first optimized the efficiency of NaV1.7 repression in vitro in Neuro2A cells, and then by the lumbar intrathecal route delivered both epigenome-engineering platforms via adeno-associated viruses (AAVs) to assess their effects in three mouse models of pain: carrageenan-induced inflammatory pain, paclitaxel-induced neuropathic pain and BzATP-induced pain. Our results demonstrate: i) effective repression of NaV1.7 in lumbar dorsal root ganglia; ii) reduced thermal hyperalgesia in the inflammatory state; iii) decreased tactile allodynia in the neuropathic state; and iv) no changes in normal motor function. We anticipate this genomically scarless and non-addictive pain prevention and amelioration approach enabling Long-lasting Analgesia via Targeted in vivo Epigenetic Repression of NaV1.7, a methodology we dub pain LATER, will have significant therapeutic potential in management of persistent pain states.

2022-01-01 | GSE159818 | GEO

Mapping protein interactions of sodium channel NaV1.7 using epitope-tagged gene targeted mice

Project description:The voltage-gated sodium channel NaV1.7 plays a critical role in pain pathways. As well as action potential propagation, NaV1.7 regulates neurotransmitter release, integrates depolarizing inputs over long periods and regulates transcription. In order to better understand these functions, we generated an epitope-tagged NaV1.7 mouse that showed normal NaV1.7 channel activity and normal pain behavior. Analysis of NaV1.7 complexes affinity-purified under native conditions by mass spectrometry revealed 267 NaV1.7 associated proteins including known and novel interactors such as sodium channel β3 subunit (Scn3b) and collapsin response mediator protein (Crmp2). Selected NaV1.7 protein interactors, such as Crmp2, membrane-trafficking protein synapototagmin-2 (Syt2), G protein-regulated inducer of neurite outgrowth 1 (Gprin1), L-type amino acid transporter 1 (Lat1) and transmembrane P24 trafficking protein 10 (Tmed10) were validated using co-immunoprecipitation and functional assays. The information provided with this physiologically normal epitope-tagged mouse should provide useful insights into the downstream mechanisms associated with NaV1.7 channel function.

2018-01-15 | PXD005155 | Pride

Single cell RNAseq analysis of dorsal root ganglia from global and cLTMR-specific Nav1.7 knockout mice

Project description:We investigated changes in gene expression and cell type abundance using single cell RNA sequencing of dorsal root ganglia (DRG) isolated from global (pCAGG-CreER x Nav1.7 floxed) and C-low threshold mechanoreceptor (cLTMR)-specific (Slc17a8-Cre x Nav1.7 floxed) Nav1.7 knockout mice. We identified a reduction in the fraction of cLTMRs and a concomitant emergence of a distinct cell cluster located closely to cLTMRs in the UMAP projection in global Nav1.7 knockout DRGs. This novel cell cluster expressed previously described cLTMR markers with distinct gene expression changes such as a downregulation of Ceacam10 and an upregulation of Penk expression. We further found that cLTMR-specifc knockout of Nav1.7 induced the same shift in cLTMR cells to a knockout-specific cluster with upregulated Penk expression.

2023-05-22 | GSE213825 | GEO

MicroRNA-96 is required to prevent allodynia by repressing voltage-gated sodium channels in spinal cord

Project description:Voltage-gated sodium channels (Navs) 1.7, 1.8, and 1.9 are predominately expressed in peripheral sensory neurons and are critical for action potential propagation in nociceptors. Unexpectedly, we found that expression of SCN9A, SCN10A, SCN11A, and SCN2A, the alpha subunit of Nav1.7, Nav1.8, Nav1.9 and Nav1.2, respectively, are up-regulated in spinal dorsal horn (SDH) neurons of miR-96 knockout mice. These mice also have de-repression of CACNA2d1/2 in DRG and display heat and mechanical allodynia that could be attenuated by intrathecal or intraperitoneal injection of Nav1.7 or Nav1.8 inhibitors or Gabapentin. Moreover, Gad2::CreERT2 conditional miR-96 knockout mice phenocopied global knockout mice, implicating inhibitory neurons; nerve injury induced significant loss of miR-96 in SDH GABAergic and Glutamatergic neurons in mice which negative correlated to up-regulation of Nav1.7, Nav1.8, Nav1.9 and Scn2a, this dis-regulation of miR-96 and Navs in SDH neurons contributed to neuropathic pain which can be alleviated by intrathecal injection of Nav1.7 or Nav1.8 blockers. In conclusion, miR-96 is required to avoid allodynia through limiting the expression of VGCCs and Navs in DRG and Navs in SDH in naïve and nerve injury induced neuropathic pain mice. Our findings suggest that central nervous system penetrating Nav1.7 and Nav1.8 inhibitors may be efficacious for pain relief.

2021-07-06 | GSE144832 | GEO

Bulk RNAseq analysis of dorsal root ganglia from global Nav1.7 knockout mice

Project description:We investigated changes in gene expression of dorsal root ganglia (DRG) isolated from global (pCAGG-CreER x Nav1.7 floxed) Nav1.7 knockout mice using bulk RNA sequencing. We found an upregulation of Penk and downregulation of Ceacam10 in Nav1.7 knockouts compared to controls, as well as other gene expression changes similar to those previously reported for Nav1.7 knockout mice (https://doi.org/10.1038/ncomms9967). We identified that genes selectively expressed in the C low-threshold mechanoreceptor (cLTMR) class of DRG neurons showed a general reduction in expression in Nav1.7 knockouts compared to littermate controls.

2023-05-22 | GSE213826 | GEO

Regulatory T cells restrain skin inflammation by modulating nociception

Project description:The skin, as a principal barrier tissue, integrates diverse signals discerned by sensory neurons and by immune cells to elicit adaptive responses to a wide range of stresses. While nociceptors, sensory neurons that initiate the sensation of pain, can mobilize and amplify the function of innate and adaptive immune effector cells, regulatory T (Treg) cells, a T cell subset expressing the transcription factor Foxp3, suppress systemic and local inflammatory responses. Considering the connectivity between nervous and immune systems for sensing and responding to damaging insults, we questioned whether Treg cells can modulate proinflammatory neuronal activity by acting directly on peripheral neurons. We found that Treg cells localized near axons innervating the skin and that short-term inactivation or ablation of Treg cells increased neuronal activation to noxious stimuli in a manner separable from their immunosuppressive function. Furthermore, a population of skin Treg cells was highly enriched for expression of Penk, the gene encoding the neuropeptide precursor for endogenous opioids enkephalins, which inhibit pain perception by inducing analgesia. Acute depletion of Penk expressing Treg cells, or inducible ablation of Penk in Treg cells increased neuronal activation in response to noxious stimuli and associated inflammation. Our study suggests that a population of Treg cells residing at barrier tissues exhibit a direct neuromodulatory activity opposing exacerbated activation of sensory neurons, at least in part through the production of an endogenous opioids, and by acting as an immune component of the neuro-immune axis, dampen responses to noxious pain stimuli and local inflammation.

2023-11-14 | GSE218063 | GEO

Expression data from FACS purified nociceptor neurons from peripheral sensory ganglia

Project description:The goal of this study was to analyze global gene expression in specific populations of nociceptor sensory neurons, the neurons that detect damaging/noxious stimuli. The dorsal root ganglia (DRG), trigeminal ganglia, and nodose ganglia are anatomically distinct peripheral sensory ganglia that contain nociceptors which innervate skin, gut, lungs, and other distinct organ tissues. We used flow cytometry to purify nociceptors from these ganglia and profiled their global gene expression signatures to compare gene expression between these different anatomically distinct nociceptors. Nav1.8-Cre were bred with Rosa26-TdTomato to generate Nav1.8-Cre/R26-TdTomato reporter progeny, where all peripheral nociceptor neurons are genetically marked with red fluroescence due to specific expression of the TTX- resistant sodium channel Nav1.8. Lumbar region dorsal root ganglia (DRG), trigeminal ganglia, and nodose ganglia were dissected from mice (3 mice were pooled/sample). Highly red fluorescent neurons were Facs purified, RNA extracted, and processed for microarray analysis.

2013-08-28 | E-GEOD-46546 | biostudies-arrayexpress

A mouse model of acute post-surgical pain

Project description:Pain is the leading cause of disability in the developed world but remains a poorly treated condition. Specifically, post-surgical pain continues to be a frequent and undermanaged condition. Here, we investigate the analgesic potential of pharmacological NaV1.7 inhibition in a mouse model of acute post-surgical pain, based on incision of the plantar skin and underlying muscle of the hind paw. We demonstrate that local and systemic treatment with the selective NaV1.7 inhibitor μ-theraphotoxin-Pn3a is effectively anti-allodynic in this model and completely reverses mechanical hypersensitivity in the absence of motor adverse effects. In addition, the selective NaV1.7 inhibitors ProTx-II and PF-04856264 as well as the clinical candidate CNV1014802 also reduced mechanical allodynia. Interestingly, co-administration of the opioid receptor antagonist naloxone completely reversed analgesic effects of Pn3a, indicating an involvement of endogenous opioids in the analgesic activity of Pn3a. Additionally, we found super-additive antinociceptive effects of sub-therapeutic Pn3a doses not only with the opioid oxycodone but also with the GABAB receptor agonist baclofen. Transcriptomic analysis of gene expression changes in dorsal root ganglia of mice post-surgery revealed decreased expression of several pro-nociceptive genes including N- and P/Q-type voltage-gated calcium channels important for neurotransmitter release, which suggest a reactive compensatory mechanism to reduce excessive pain similar to the endogenous opioid system. In summary, these findings suggest that pain after surgery can be successfully treated with NaV1.7 inhibitors alone or in combination with baclofen or opioids, which may present a novel and safe treatment strategy for this frequent and poorly managed condition.

2019-05-01 | GSE125076 | GEO

Mice brain tissue IP experiment

Project description:This is a experment want to fish out the proteins in the mice brain can interact with sodium chanel protein Nav1.7, immuno precipatation and lab free mass spectrmetry were used to identify Nav1.7 Interation parter proteins.

2018-01-15 | PXD004926 | Pride

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