ArticleThe Journal of biological chemistry2011
Function of partially duplicated human α77 nicotinic receptor subunit CHRFAM7A gene: potential implications for the cholinergic anti-inflammatory response.
Article in The Journal of biological chemistry, 2011. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 76 papers, 1 of them a synthesis that pooled it.
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Who cites it
76 citing papers in PubMed, 1 synthesis or guideline pooled it, 122 citations in OpenAlex.
- Pooled it
- Activation of the alpha 7 nicotinic acetylcholine receptor (CHRNA7) limits hypoxia-induced inflammatory responses and regulates collagens in cultured human granulosa cells†.Biology of reproduction · 2026Article
- Putative α7-selective ligands interact with α9-containing nicotinic acetylcholine receptors and modulate immune functions of human mononuclear phagocytes.Frontiers in immunology · 2026Article
- The ATP-mediated cytokine release by macrophages is down-modulated by unconventional α9* nicotinic acetylcholine receptors.Frontiers in immunology · 2025Article
- CHRFAM7A diversifies human immune adaption through CaEBioMedicine · 2024Article
- Contributions of Non-Neuronal Cholinergic Systems to the Regulation of Immune Cell Function, Highlighting the Role of α7 Nicotinic Acetylcholine Receptors.International journal of molecular sciences · 2024Review
- Translational implications of CHRFAM7A, an elusive human-restricted fusion gene.Molecular psychiatry · 2024Review
- Anti-hyperalgesic and anti-inflammatory effects of 4R-tobacco cembranoid in a mouse model of inflammatory pain.Journal of inflammation (London, England) · 2024Article
- Human restrictedFrontiers in neuroscience · 2024Article
- Enteric Nervous System: Identification of a Novel Neuronal Sensory Network in the Duodenal Epithelium.The journal of histochemistry and cytochemistry : official journal of the Histochemistry Society · 2023Article
- Cholinergic Polarization of Human Macrophages.International journal of molecular sciences · 2023Review
- Nicotine: From Discovery to Biological Effects.International journal of molecular sciences · 2023Review
- Review
- GTS-21 Enhances Regulatory T Cell Development from T Cell Receptor-Activated Human CD4International journal of molecular sciences · 2023Article
- Human-specific duplicate CHRFAM7A gene is associated with more severe osteoarthritis and amplifies pain behaviours.Annals of the rheumatic diseases · 2023Article
- Neuroimmune nexus in the pathophysiology and therapy of inflammatory disorders: Role of α7 nicotinic acetylcholine receptors.Pharmacological research · 2023Review
- α7- and α9-Containing Nicotinic Acetylcholine Receptors in the Functioning of Immune System and in Pain.International journal of molecular sciences · 2023Review
- Effects of Different Exercise Types on Chrna7 and Chrfam7a Expression in Healthy Normal Weight and Overweight Type 2 Diabetic Adults.Biomedicines · 2023Article
- Up-regulation of the human-specific CHRFAM7A gene protects against renal fibrosis in mice with obstructive nephropathy.Journal of cellular and molecular medicine · 2023Article
- Review
16 more citing papers are in PubMed but not listed here.
Corrections and comments
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Authors and funding
10 authors at 4 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The neuronal α7 nicotinic receptor subunit gene (CHRNA7) is partially duplicated in the human genome forming a hybrid gene (CHRFAM7A) with the novel FAM7A gene. The hybrid gene transcript, dupα7, has been identified in brain, immune cells, and the HL-60 cell line, although its translation and function are still unknown. In this study, dupα7 cDNA has been cloned and expressed in GH4C1 cells and Xenopus oocytes to study the pattern and functional role of the expressed protein. Our results reveal that dupα7 transcript was natively translated in HL-60 cells and heterologously expressed in GH4C1 cells and oocytes. Injection of dupα7 mRNA into oocytes failed to generate functional receptors, but when co-injected with α7 mRNA at α7/dupα7 ratios of 5:1, 2:1, 1:1, 1:5, and 1:10, it reduced the nicotine-elicited α7 current generated in control oocytes (α7 alone) by 26, 53, 75, 93, and 94%, respectively. This effect is mainly due to a reduction in the number of functional α7 receptors reaching the oocyte membrane, as deduced from α-bungarotoxin binding and fluorescent confocal assays. Two additional findings open the possibility that the dominant negative effect of dupα7 on α7 receptor activity observed in vitro could be extrapolated to in vivo situations. (i) Compared with α7 mRNA, basal dupα7 mRNA levels are substantial in human cerebral cortex and higher in macrophages. (ii) dupα7 mRNA levels in macrophages are down-regulated by IL-1β, LPS, and nicotine. Thus, dupα7 could modulate α7 receptor-mediated synaptic transmission and cholinergic anti-inflammatory response.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.