RESUMO
Carriers of the human 15q13.3 microdeletion (MD) present with a variable spectrum of neuropathological phenotypes that range from asymptomatic to severe clinical outcomes, suggesting an interplay of genetic and non-genetic factors. The most common 2â¯MB 15q13.3 MD encompasses six genes (MTMR10, FAN1, TRPM1, KLF13, OTUD7A, and CHRNA7), which are expressed in neuronal and non-neuronal tissues. The nicotinic acetylcholine receptor (nAChR) α7, encoded by CHRNA7, is a key player in the cholinergic anti-inflammatory pathway, and the transcription factor KLF13 is also involved in immune responses. Using a mouse model with a heterozygous deletion of the orthologous region of the human 15q13.3 (Df[h15q13]/+), the present study examined peripheral and central innate immune responses to an acute intraperitoneal (i.p.) injection of the bacteriomimetic, lipopolysaccharide (LPS) (100⯵g/kg) in adult heterozygous (Het) and wildtype (WT) mice. Serum levels of inflammatory markers were measured 2â¯h post injection using a Multiplex assay. In control saline injected animals, all measured cytokines were at or below detection limits, whereas LPS significantly increased serum levels of interleukin 1beta (IL-1ß), tumor necrosis factor alpha (TNF-α), IL-6 and IL-10, but not interferon-γ. There was no effect of genotype but a sexual dimorphic response for TNF-α, with females exhibiting greater LPS-induced TNF-α serum levels than males. In situ hybridization revealed similar increases in LPS-induced c-fos mRNA expression in the dorsal vagal complex in all groups. The hippocampal expression of the pro-inflammatory cytokines was evaluated by real-time quantitative PCR. LPS-treatment resulted in significantly increased mRNA expression for IL-1ß, IL-6, and TNF-α compared to saline controls, with no effect of genotype, but a significant sex-effect was detected for IL-1ß. The present study provided no evidence for interactive effects between the heterozygous 15q13.3 MD and a low-dose LPS immune challenge in innate peripheral or central immune responses, although, sex-differential effects in males and females were detected.
Assuntos
Transtornos Cromossômicos/metabolismo , Citocinas/sangue , Regulação da Expressão Gênica/efeitos dos fármacos , Imunidade Inata , Deficiência Intelectual/metabolismo , Convulsões/metabolismo , Animais , Fatores de Transcrição Hélice-Alça-Hélice Básicos/sangue , Fatores de Transcrição Hélice-Alça-Hélice Básicos/genética , Deleção Cromossômica , Transtornos Cromossômicos/genética , Transtornos Cromossômicos/imunologia , Cromossomos Humanos Par 15/genética , Cromossomos Humanos Par 15/imunologia , Cromossomos Humanos Par 15/metabolismo , Citocinas/genética , Modelos Animais de Doenças , Feminino , Regulação da Expressão Gênica/genética , Regulação da Expressão Gênica/imunologia , Hipocampo/metabolismo , Imunidade , Imunidade Inata/efeitos dos fármacos , Imunidade Inata/genética , Hibridização In Situ , Inflamação/sangue , Inflamação/genética , Deficiência Intelectual/genética , Deficiência Intelectual/imunologia , Interferon gama/sangue , Interferon gama/genética , Interleucina-10/sangue , Interleucina-10/genética , Interleucina-1beta/sangue , Interleucina-1beta/genética , Interleucina-6/sangue , Interleucina-6/genética , Lipopolissacarídeos/imunologia , Lipopolissacarídeos/farmacologia , Masculino , Camundongos , Camundongos Endogâmicos C57BL , Proteínas Proto-Oncogênicas c-fos/genética , Proteínas Proto-Oncogênicas c-fos/metabolismo , Reação em Cadeia da Polimerase em Tempo Real , Convulsões/genética , Convulsões/imunologia , Fator de Necrose Tumoral alfa/sangue , Fator de Necrose Tumoral alfa/genéticaRESUMO
The protozoan Leishmania chagasi can cause disseminated, fatal visceral leishmaniasis (VL) or asymptomatic infection in humans. We hypothesized that host genetic factors contribute to this variable response to infection. A family study was performed in neighborhoods of endemicity for L. chagasi near Natal in northeastern Brazil. Study subjects were assessed for the presence of VL or asymptomatic infection, which was defined by a positive delayed-type hypersensitivity (DTH) skin test response to Leishmania antigen without disease symptoms. A genomewide panel of 385 autosomal microsatellite markers in 1254 subjects from 191 families was analyzed to identify regions of linkage. Regions with potential linkage to the DTH response on chromosomes 15 and 19, as well as a novel region on chromosome 9 with potential linkage to VL, were identified. Understanding the genetic factors that determine whether an individual will develop symptomatic or asymptomatic infection with L. chagasi may identify proteins essential for immune protection against this parasitic disease and reveal strategies for immunotherapy or prevention.
Assuntos
Cromossomos Humanos Par 15 , Cromossomos Humanos Par 19 , Imunidade Inata/genética , Leishmania/patogenicidade , Leishmaniose/imunologia , Adolescente , Animais , Brasil , Criança , Pré-Escolar , Cromossomos Humanos Par 15/genética , Cromossomos Humanos Par 15/imunologia , Cromossomos Humanos Par 15/parasitologia , Cromossomos Humanos Par 19/genética , Cromossomos Humanos Par 19/imunologia , Cromossomos Humanos Par 19/parasitologia , Doenças Endêmicas , Feminino , Ligação Genética , Humanos , Hipersensibilidade Tardia/genética , Hipersensibilidade Tardia/imunologia , Lactente , Leishmaniose/fisiopatologia , Masculino , FenótipoRESUMO
T-cell receptor Vss gene repertoire and clonality have been studied in patients with leukemia and solid tumors, by assaying the CDR3 size of TCR genes, using RT-PCR and genescan analysis. Few studies have studied leukemia-associated oligoclonal expanded T-cells in leukemia, therefore, the aim of this study was to investigate the distribution and clonal expansion of T-cell receptor, Vss subfamily T-cells in patients with acute promyelocytic leukemia (APL) with t(15;17). The CDR3 of TCR Vbeta24 subfamily genes were analyzed in peripheral blood mononuclear cells from 17 cases with PML-RARalpha+ APL using RT-PCR and genescan technique. Ten normal individuals served as controls. The results showed that the number of expressed Vss subfamilies (from 2 to 21 subfamilies) varied in different patients with APL. The most frequently expressed Vss subfamilies were Vbeta2 (64.7%), Vbeta15 (58.8%), Vbeta3 and Vbeta5 (47.1%), with a lower expression rate found in Vbeta11 and Vbeta20 (11.7%). Clonally expanded T-cells in the Vss subfamilies could be identified in patients with APL in all but two of the cases studied, predominantly in Vbeta10, Vbeta23, Vbeta3 and Vbeta21. In conclusion, skewed distribution and clonal expansion of TCR Vss subfamily T-cells could be found in patients with APL. The clonal expansion of T-cells were considered to be a specific anti-leukemic immune response by host T-cells activated by the leukemia-associated-antigen.
Assuntos
Regulação Leucêmica da Expressão Gênica/genética , Rearranjo Gênico do Linfócito T/genética , Genes Codificadores da Cadeia beta de Receptores de Linfócitos T/genética , Leucemia Promielocítica Aguda/genética , Adolescente , Adulto , Criança , Cromossomos Humanos Par 15/genética , Cromossomos Humanos Par 15/imunologia , Cromossomos Humanos Par 17/genética , Cromossomos Humanos Par 17/imunologia , Feminino , Regulação Leucêmica da Expressão Gênica/imunologia , Rearranjo Gênico do Linfócito T/imunologia , Genes Codificadores da Cadeia beta de Receptores de Linfócitos T/imunologia , Humanos , Leucemia Promielocítica Aguda/imunologia , Masculino , Pessoa de Meia-Idade , Translocação Genética/genética , Translocação Genética/imunologiaRESUMO
CDw108, also known as the John-Milton-Hagen human blood group Ag, is an 80-kDa glycosylphosphatidylinositol (GPI)-anchored membrane glycoprotein that is preferentially expressed on activated lymphocytes and E. The molecular characteristics and biological function of the CDw108 were not clarified previously. In this manuscript, we identify the cDNA clone containing the entire coding sequence of the CDw108 gene and report its molecular characteristics. The 1998-base pairs of the open reading frame of the cloned cDNA encoded a protein of 666 amino acids (aa), including the 46 aa of the signal peptide and the 19 aa of the GPI-anchor motif. Thus, the membrane-anchoring form of CDw108 was the 602 aa, and the estimated molecular mass of the unglycosylated form was 68 kDa. The RGD (Arg-Gly-Asp) cell attachment sequence and the five potential N-linked glycosylation sites were located on the membrane-anchoring form. Flow cytometric and immunoprecipitation analyses of the CDw108 cDNA transfectants confirmed that the cloned cDNA encoded the native form of CDw108. The CDw108 mRNA was expressed in activated PBMCs as well as in the spleen, thymus, testis, placenta, and brain, but was not expressed in any other tissues tested. Radiation hybrid mapping indicated that the CDw108 gene was located in the middle of the long arm of chromosome 15 (15q23-24). This molecular information will be critical for understanding the biological function of the CDw108 Ag.