Acute and chronic lithium treatment increases Wnt/ß-catenin transcripts in cortical and hippocampal tissue at therapeutic concentrations in mice.

Lithium activates Wnt/ß-catenin signaling leading to stabilization of free cytosolic ß-catenin. The aim of the present study is to evaluate the in vivo effect of acute and chronic lithium treatment on the expression of ß-catenin target genes, addressing its transcripts HIG2, Bcl-xL, Cyclin D1, c-myc, in cortical and hippocampal tissue from adult mice. Lithium doses were established to yield therapeutic working concentrations. In acute treatment, mice received a 300µL of a 350 mg/kg solution of LiCl by gavage, and were euthanized after 2 h, 6 h and 12 h. To determine the effect of chronic treatment, animals were continuously fed either with chow supplemented with 2 g/kg Li2CO3, or regular chow (controls), being euthanized after 30 days. All animals had access to drinking water and 0.9% saline ad libitum. After acute and chronic treatments samples of peripheral blood were obtained from the tail vein for each animal, and serum concentrations of lithium were determined. All transcripts were up-regulated in cortical and hippocampal tissues of lithium-treated mice, both under acute and chronic treatments. There was a positive correlation between serum lithium concentrations and the increment in the expression of all transcripts. This effect was observed in all time points of the acute treatment (i.e., 2, 6 and 12 hours) and also after 30 days. We conclude that Wnt/ß-catenin transcriptional response (HIG2, Bcl-xL, Cyclin D1 and c-myc) is up-regulated in the mouse brain in response to acute and chronic lithium treatment at therapeutic concentrations.

Primary immunodeficiency diseases in different age groups: a report on 1,008 cases from a single Brazilian reference center.

Primary immunodeficiencies (PIDs) represent a large group of diseases that affect all age groups. Although PIDs have been recognized as rare diseases, there is epidemiological evidence suggesting that their real prevalence has been underestimated. We performed an evaluation of a series of 1,008 infants, children, adolescents and adults with well-defined PIDs from a single Brazilian center, regarding age at diagnosis, gender and PID category according to the International Union of Immunological Societies classification. Antibody deficiencies were the most common category in the whole series (61 %) for all age groups, with the exception of <2-year-old patients (only 15 %). In the >30-year-old group, antibody deficiencies comprised 84 % of the diagnoses, mostly consisting of common variable immunodeficiency, IgA deficiency and IgM deficiency. Combined immunodeficiencies represented the most frequent category in <2-years-old patients. Most congenital defects of phagocytes were identified in patients <5 -years of age, as were the diseases of immune dysregulation, with the exception of APECED. DiGeorge syndrome and ataxia-telangiectasia were the most frequent entities in the category of well-defined syndromes, which were mostly identified in patients <10-years of age. Males represented three-quarters and two-thirds of <2 -years-old and 2-5-years -old patients, respectively, whereas females predominated among the >30-year-old patients. Our data indicated that some PIDs were only detected at early ages, likely because affected patients do not survive long. In addition, our data pointed out that different strategies should be used to search for PIDs in infants and young children as compared to older patients.

Inflammatory and Immunological parameters in adults with Down syndrome.

BACKGROUND: The increase in life expectancy within the general population has resulted in an increasing number of elderly adults, including patients with Down syndrome (DS), with a current life expectancy of about 50 years. We evaluate the parameters of humoral and cellular immune response, the quantitative expression of the regulator of calcineurin1 gene (RCAN1) and the production of cytokines. The study group consisted of adults DS (n = 24) and a control group with intellectual disability without Down syndrome (ID) (n = 21) and living in a similar environmental background. It was evaluated serology, immunophenotyping, the quantitative gene expression of RCAN1 and the production of cytokines. RESULTS: In the DS group, the results showed an increase in NK cells, CD8, decreased CD19 (p < 0.05) and an increase spontaneous production of IFNgamma, TNFalpha and IL-10 (p < 0.05). There was not any difference in RCAN1 gene expression between the groups. CONCLUSIONS: These data suggest a similar humoral response in the two groups. The immunophenotyping suggests sign of premature aging of the immune system and the cytokine production show a proinflammatory profile.

Differential gene expression elicited by ZIKV infection in trophoblasts from congenital Zika syndrome discordant twins.

Zika virus (ZIKV) causes congenital Zika syndrome (CZS), which is characterized by fetal demise, microcephaly and other abnormalities. ZIKV in the pregnant woman circulation must cross the placental barrier that includes fetal endothelial cells and trophoblasts, in order to reach the fetus. CZS occurs in ~1-40% of cases of pregnant women infected by ZIKV, suggesting that mothers' infection by ZIKV during pregnancy is not deterministic for CZS phenotype in the fetus. Therefore, other susceptibility factors might be involved, including the host genetic background. We have previously shown that in three pairs of dizygotic twins discordant for CZS, neural progenitor cells (NPCs) from the CZS-affected twins presented differential in vitro ZIKV susceptibility compared with NPCs from the non-affected. Here, we analyzed human-induced-pluripotent-stem-cell-derived (hiPSC-derived) trophoblasts from these twins and compared by RNA-Seq the trophoblasts from CZS-affected and non-affected twins. Following in vitro exposure to a Brazilian ZIKV strain (ZIKVBR), trophoblasts from CZS-affected twins were significantly more susceptible to ZIKVBR infection when compared with trophoblasts from the non-affected. Transcriptome profiling revealed no differences in gene expression levels of ZIKV candidate attachment factors, IFN receptors and IFN in the trophoblasts, either before or after ZIKVBR infection. Most importantly, ZIKVBR infection caused, only in the trophoblasts from CZS-affected twins, the downregulation of genes related to extracellular matrix organization and to leukocyte activation, which are important for trophoblast adhesion and immune response activation. In addition, only trophoblasts from non-affected twins secreted significantly increased amounts of chemokines RANTES/CCL5 and IP10 after infection with ZIKVBR. Overall, our results showed that trophoblasts from non-affected twins have the ability to more efficiently activate genes that are known to play important roles in cell adhesion and in triggering the immune response to ZIKV infection in the placenta, and this may contribute to predict protection from ZIKV dissemination into fetuses' tissues.

HLA-G is upregulated in advanced endometriosis.

OBJECTIVE: To assess whether the HLA-G immunomodulatory protein is potentially involved in the pathophysiology of endometriosis or disease progression. STUDY DESIGN: Cross-sectional observational study of 227 women who underwent laparoscopy, being 146 for endometriosis excision and 81 for elective tubal ligation (control group). Soluble HLA-G (sHLA-G) levels in the serum and peritoneal fluid (PF), as well as the HLA-G protein expression in matched eutopic and ectopic endometrium of women with and without endometriosis were evaluated by ELISA and immunohistochemistry assays, respectively. Women with endometriosis were separated into groups according to the initial (I/II, n = 60) and advanced (III/IV, n = 86) stages of disease. sHLA-G measurement was performed only in women with matched serum and PF samples in both the control (CTRL; n = 77) and endometriosis (EDT; I-II, n = 60; III-IV, n = 83) groups. HLA-G protein expression was evaluated in 26 women with deep endometriosis (I-II, n = 12; III-IV, n = 14) and 22 controls. RESULTS: Higher concentrations of sHLA-G (P = 0.013) in the serum but not in the PF were observed in women with advanced endometriosis compared to the control group. In situ expression of HLA-G protein was also higher in ectopic (P = 0.018) but not in eutopic endometrium of women with advanced endometriosis compared to control group. CONCLUSION: Our findings suggest that HLA-G upregulation in advanced stages may contribute to the state of immunosuppression in endometriosis as disease progresses.

Gene expression profile in long-term non progressor HIV infected patients: in search of potential resistance factors.

Long-term non-progressors (LTNP) represent a minority (1-5%) of HIV-infected individuals characterized by documented infection for more than 7-10 years, a stable CD4+ T cell count over 500/mm(3) and low viremia in the absence of antiretroviral treatment. Protective factors described so far such as the CCR5delta32 deletion, protective HLA alleles, or defective viruses fail to fully explain the partial protection phenotype. The existence of additional host resistance mechanisms in LTNP patients was investigated here using a whole human genome microarray study comparing gene expression profiles of unstimulated peripheral blood mononuclear cells from LTNP patients, HIV-1 infected patients under antiretroviral therapy with CD4+ T cell levels above 500/mm(3) (ST), as well as healthy individuals. Genes that were up- or downregulated exclusively in LTNP, ST or in both groups in comparison to controls were identified and classified in functional categories using Ingenuity Pathway Analysis. ST and LTNP patient groups revealed distinct genetic profiles, regarding gene number in each category and up- or downregulation of specific genes, which could have a bearing on the outcome of each group. We selected some relevant genes to validate the differential expression using quantitative real-time qRT-PCR. Among others, we found several genes related to the canonical Wnt/beta-catenin signaling pathway. Our results identify new possible host genes and molecules that could be involved in the mechanisms leading to the slower progression to AIDS and sustained CD4+ T cell counts that is peculiar to LTNP patients.

Estudo dos métodos laboratoriais utilizados no diagnóstico de alergia a Hymenoptera: análise crítica / Study of laboratorial methods for Hymenoptera allergy diagnosis: a critical analysis

Objetivo:Avaliar dados epidemiológicos de 138 pacientes alérgicosa Hymenoptera e analisar o valor da IgE específica (RAST) em 68 pacientes, considerando a sensibilidade (S), e especificidade (Es), a eficácia (Ef), o valor preditivo positivo (VPP) e negativo (VPN)deste método. Métodos: Avaliou-se 138 pacientes acompanhados em serviço especializado que apresentaram reaçöes a himenópteros (abelha, vespa ou formiga), sendo submetidos a um protocolo clínico. Em 68 pacientes realizou-se teste cutâneo para o inseto referido na anamnese, sendo considerados alérgicos os pacientes que possuíam história sugestiva de reaçäo sistêmica (grau I a IV) e teste cutâneo positivo. Realizou-se o RASTpara cada um dos insetos e calculou-se S, Es, Ef, VPP, e VPN deste método em relaçäo à história clínica e testes cutâneos. Resultados: Nos 138 pacientes (92M: 46F), o primeiro episódio de alergia ocorreu em média aos 20,11 anos (mediana = 16 anos). Cerca de 93,47 por cento dos pacientes reconheceram o inseto envolvido (32,60 por cento, vespa; 28,20 por cento, abelha; 26,80 por cento, formiga; 5,78 por cento, mais de um inseto). A análise do RAST com relaçäo aos pacientes alérgicos mostrou os seguintes resultados para formiga: S= 90,47 por cento, Es= 36,36 por cento, Ef=53,84 por cento, VPP= 40,42 por cento, e VPN= 88,88 por cento. Para vespa: S= 61,90 por cento, Es=69,23 por cento, Ef=66,66 por cento, VPP=61,90 por cento e VPN=69,23 por cento e para abelha: S= 78,57 por cento, Es=67,39 por cento, EF= 70,00 por cento, VPP= 42,30 por cento e VPN = 91,17 por cento. Conclusöes: As reaçöes alérgicas aos himenópteros ocorreram preferencialmente em jovens do sexo masculino. Quanto ao RAST, sua valorizaçäo deve considerar o inseto envolvido. Para as formigas, mostrou-se um exame de alta sensibilidade, no entanto, baixas especificidade e eficiência. Quanto às abelhas e vespas, os índices apontam a necessidade do desenävolvimento de novos extratos, principalmente em relaçäo às vespas, por sua grande diversidade de espécies em países tropicais. Como nos testes cutâneos, o isolamento do inseto e produçäo de alérgeno específico, tornará o RAST um exame mais fidedigno.