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The morphological and functional differences and similarities of immune cells between non-human primates and humans

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Macaca fascicularis Homo sapiens Macaca mulatta

PROVIDER: GSE90723 | GEO | 2018/11/28

REPOSITORIES: GEO

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The morphological and functional differences and similarities of immune cells between non-human primates and humans [monkey]

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The morphological and functional differences and similarities of immune cells between non-human primates and humans

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Genome-wide DNA methylation analyses in the brain reveal four differentially methylated regions between humans and non-human primates

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Project description:Nicotinic acetylcholine receptors (nAChRs) are highly conserved between humans and non-human primates. Conservation exists at the level of genomic structure, protein structure and epigenetics. Overall homology of nAChRs at the protein level is 98% in macaques versus 89% in mice, which is highly relevant for evaluating subtype-specific ligands that have different affinities in humans versus rodents. In addition to conservation at the protein level, there is high conservation of genomic structure in terms of intron and exon size and placement of CpG sites that play a key role in epigenetic regulation. Analysis of single nucleotide polymorphisms (SNPs) shows that while the majority of SNPs are not conserved between humans and macaques, some functional polymorphisms are. Most significantly, cynomolgus monkeys express a similar α5 nAChR Asp398Asn polymorphism to the human α5 Asp398Asn polymorphism that has been linked to greater nicotine addiction and smoking related disease. Monkeys can be trained to readily self-administer nicotine, and in an initial study we have demonstrated that cynomolgus monkeys bearing the α5 D398N polymorphism show a reduced behavioral sensitivity to oral nicotine and tend to consume it in a different pattern when compared to wild-type monkeys. Thus the combination of highly homologous nAChR, higher cortical functions and capacity for complex training makes non-human primates a unique model to study in vivo functions of nicotinic receptors. In particular, primate studies on nicotine addiction and evaluation of therapies to prevent or overcome nicotine addiction are likely to be highly predictive of treatment outcomes in humans. This article is part of the Special Issue entitled 'The Nicotinic Acetylcholine Receptor: From Molecular Biology to Cognition'.

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Acute non-A, non-B, non-C hepatitis differences and similarities between hepatitis E virus infection and autoimmune hepatitis, with phylogenetic analysis of hepatitis E virus in humans and wild boars.

Project description:BackgroundHepatitis E virus (HEV) infection incidence is increasing in Europe, accounting for the majority of acute hepatitis cases. We investigated the prevalence and clinical characteristics of acute hepatitis E (AHE) in patients with acute non-A/B/C hepatitis from central Greece, their differences from acute autoimmune hepatitis (AIH) patients and the molecular similarity of human strains to local HEV strains in wild boars.MethodsSera from 20 patients with non-A/B/C acute hepatitis (2015-2017) were tested prospectively for anti-HEV IgM, IgG antibodies and HEV-RNA. Sera from patients diagnosed with acute AIH (2000-2015; n=56) were tested retrospectively. Liver tissue samples from 40 wild boars were tested for HEV-RNA. Positive wild boar and patients' samples were sequenced and phylogenetically analyzed.ResultsTwelve of the 76 (16%) patients were diagnosed with AHE: HEV-RNA 11.5x104 (38.7-39.7x106) IU/mL; 11/20 (55%) acute non-A/B/C hepatitis and 1/56 (2%) AIH patients. Patients with AHE were older than those without, predominately men, with higher alanine aminotransferase but lower IgG levels (P=0.005 and P=0.002, respectively), and had high titers of smooth muscle antibodies. Liver biopsies, performed in 6/12 patients with HEV infection, revealed histology compatible with AIH. HEV strains from both patients and wild boars belonged to genotype 3.ConclusionsApproximately one sixth of patients with acute non-A/B/C hepatitis had autochthonous HEV infection with AIH features. Therefore, a careful workup to exclude HEV should be carried out in all acute hepatitis cases before a definite diagnosis of AIH is established. Wild boars seem to be an important reservoir of HEV in Greece.

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