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Botelho Alves P, Pires Pereira H, Costa Carvalho J, Nunes I, Todo-Bom A, Faria E, Regateiro F, Paiva A. Expression of IL-17RA in Innate Cells of Patients with Common Variable Immunodeficiency (CVID) and its Clinical Implications. Eur Ann Allergy Clin Immunol 2024. [PMID: 38259136 DOI: 10.23822/eurannaci.1764-1489.326] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Summary Background. Common Variable Immunodeficiency (CVID) is a primary immunodeficiency disorder characterized by B-cell dysfunction and immunoglobulin production deficiency. Dysregulation of interleukin-17 (IL-17) and its receptor IL-17RA have been reported in various immune disorders. This study aimed to investigate the expression of IL-17RA in innate immune cells of CVID patients and its correlation with clinical manifestations. Methods. A cross-sectional study included 22 CVID patients and 14 age- and sex-matched healthy controls. IL-17RA expression was assessed in various immune cell subsets using flow cytometry. Demographic and clinical data were collected, and statistical analysis was performed. Results. CVID patients had elevated IL-17RA expression in neutrophils, non-classical monocytes, and dendritic cells compared to healthy controls. Patients with a history of intestinal microbial colonization, particularly with Campylobacter jejuni and Giardia intestinalis, showed significantly higher IL-17RA expression in innate cells. Elevated IL-17RA expression in monocytes and dendritic cells also correlated with higher fecal calprotectin levels in CVID patients, regardless of microbial colonization. Conclusions. The study suggests that despite previous reports of reduced circulating Th17 cells and IL-17 levels in CVID patients, IL-17RA expression in innate cells may be elevated, potentially indicating altered IL-17 signaling. This heightened IL-17RA expression could contribute to a persistent pro-inflammatory state, possibly due to microbial translocation or other inflammatory factors. The association of IL-17RA expression with gastrointestinal microbial colonization and its correlation with fecal calprotectin underscores the complexity of IL-17RA's role in CVID pathophysiology. Further research in larger cohorts could elucidate the implications of IL-17RA expression in both infectious and non-infectious inflammatory aspects of CVID.
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Affiliation(s)
- P Botelho Alves
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
| | - H Pires Pereira
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
| | - J Costa Carvalho
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
| | - I Nunes
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
| | - A Todo-Bom
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
- Institute of Immunology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - E Faria
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
| | - F Regateiro
- Allergy and Clinical Immunology Unit, Coimbra Hospital and University Centre (CHUC), Coimbra, Portugal
- Institute of Immunology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal
- Center for Innovative Biomedicine and Biotechnology (CIBB), Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - A Paiva
- Flow Cytometry - Pathology Unit, University of Coimbra, Coimbra, Portugal
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2
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Vieira RJ, Sousa-Pinto B, Pereira AM, Cordeiro CR, Loureiro CC, Regateiro F, Taborda-Barata L, Bousquet J, Fonseca J. Asthma hospitalizations: A call for a national strategy to fight health inequities. Pulmonology 2023; 29:179-183. [PMID: 36907817 DOI: 10.1016/j.pulmoe.2022.12.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2022] [Revised: 11/30/2022] [Accepted: 12/01/2022] [Indexed: 03/12/2023] Open
Affiliation(s)
- R J Vieira
- Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto, Portugal; Centre for Health Technology and Services Research, Health Research Network (CINTESIS@RISE), Faculty of Medicine of the University of Porto, Portugal
| | - B Sousa-Pinto
- Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto, Portugal; Centre for Health Technology and Services Research, Health Research Network (CINTESIS@RISE), Faculty of Medicine of the University of Porto, Portugal.
| | - A M Pereira
- Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto, Portugal; Allergy Unit, CUF Porto Hospital & Institute, Portugal
| | - C R Cordeiro
- Department of Pulmonology, University Hospital of Coimbra, Portugal; Faculty of Medicine, University of Coimbra, Portugal
| | - C C Loureiro
- Department of Pulmonology, University Hospital of Coimbra, Portugal; Faculty of Medicine, University of Coimbra, Portugal
| | - F Regateiro
- Allergy and Clinical Immunology Unit, Centro Hospitalar Universitário de Coimbra, Coimbra, Portugal; Institute of Immunology, Faculty of Medicine, University of Coimbra, Coimbra, Portugal; Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, Coimbra, Portugal
| | - L Taborda-Barata
- UBIAir - Clinical & Experimental Lung Centre, University of Beira Interior, Covilhã, Portugal; CICS-Health Sciences Research Centre, University of Beira Interior, Covilhã, Portugal; Department of Immunoallergology, Cova da Beira University Hospital Centre, Covilhã, Portugal
| | - J Bousquet
- Institute for Allergology, Charité - Universitätsmedizin Berlin, Corporate, Member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany; Fraunhofer Institute for Translational Medicine and Pharmacology ITMP, Allergology and Immunology, Berlin, Germany; University Hospital, Montpellier, France; ARIA, Montpellier, France
| | - J Fonseca
- Department of Community Medicine, Information and Health Decision Sciences (MEDCIDS), Faculty of Medicine, University of Porto, Portugal; Centre for Health Technology and Services Research, Health Research Network (CINTESIS@RISE), Faculty of Medicine of the University of Porto, Portugal; Allergy Unit, CUF Porto Hospital & Institute, Portugal
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Fernandes RA, Regateiro F, Pereira C, Faria E, Pita J, Todo-Bom A, Carrapatoso I. Anaphylaxis in a food allergy outpatient department: one-year review. Eur Ann Allergy Clin Immunol 2017; 50:81-88. [PMID: 29384116 DOI: 10.23822/eurannaci.1764-1489.45] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Summary Background. Anaphylaxis is an acute, potentially fatal, multi-organ allergic reac-tion. Our aim was to characterize the population with food induced anaphylaxis followed over a one-year period. Methods. Retrospective analysis of clinical files of patients with food anaphylaxis observed in our food allergy consultation during 2016. Results. Sixty-two patients were included. In the pediatric group, the implicated allergens were cow's milk, egg and fish and in the adults' group, the commonest allergens were nuts and wheat. Allergy to shrimp affected equally children and adults. The most frequent symptoms were urticaria (85.5%), angioedema (64.5%) and dyspnea (62.9%). Cofactors were present in 32.6% of patients, mainly exercise. Asthma and/or rhinitis were the most frequent comorbidities. Conclusion. In accordance to other studies, milk and egg were the most implicated allergens in children. Anaphylaxis in adults reflects the Mediterranean sensitization pattern. Exercise was the most relevant cofactor.
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Affiliation(s)
- R A Fernandes
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - F Regateiro
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - C Pereira
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - E Faria
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - J Pita
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - A Todo-Bom
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
| | - I Carrapatoso
- Allergy and Clinical Immunology Department, Coimbra University Center, Coimbra, Portugal
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4
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Sarmento-Ribeiro AB, Dourado M, Paiva A, Freitas A, Silva T, Regateiro F, Oliveira CR. Apoptosis Deregulation Influences Chemoresistance to Azaguanine in Human Leukemic Cell Lines. Cancer Invest 2012; 30:331-42. [DOI: 10.3109/07357907.2012.659925] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- A. B. Sarmento-Ribeiro
- Applied Molecular Biology/Biochemistry Institute and Center of Investigation in Environment, Genetics and Oncobiology (CIMAGO), Faculty of Medicine, University of Coimbra,
Coimbra, Portugal,1
- Center for Neuroscience and Cell Biology (CNC), University of Coimbra,
Coimbra, Portugal,2
- Universitaire Clinic of Hematology, Faculty of Medicine, University of Coimbra, Portugal6
| | - M. Dourado
- Center for Neuroscience and Cell Biology (CNC), University of Coimbra,
Coimbra, Portugal,2
- Physiopathology Discipline of Medical Dental Care, Faculty of Medicine, University of Coimbra,
Coimbra, Portugal,3
| | - A. Paiva
- Center for Neuroscience and Cell Biology (CNC), University of Coimbra,
Coimbra, Portugal,2
- Center of Histocompatibility,
Coimbra, Portugal,4
| | - A. Freitas
- Center of Histocompatibility,
Coimbra, Portugal,4
| | - T. Silva
- Hematopathology, Institute of Pathological Anatomy, Faculty of Medicine, University of Coimbra,
Coimbra, Portugal,5
| | - F. Regateiro
- Center for Neuroscience and Cell Biology (CNC), University of Coimbra,
Coimbra, Portugal,2
- Center of Histocompatibility,
Coimbra, Portugal,4
| | - C. R. Oliveira
- Applied Molecular Biology/Biochemistry Institute and Center of Investigation in Environment, Genetics and Oncobiology (CIMAGO), Faculty of Medicine, University of Coimbra,
Coimbra, Portugal,1
- Center for Neuroscience and Cell Biology (CNC), University of Coimbra,
Coimbra, Portugal,2
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Alvarez M, Piedade J, Balseiro S, Ribas G, Regateiro F. HLA-G 3'-UTR SNP and 14-bp deletion polymorphisms in Portuguese and Guinea-Bissau populations. Int J Immunogenet 2009; 36:361-6. [PMID: 19821846 DOI: 10.1111/j.1744-313x.2009.00875.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
In the HLA-G locus, the 3'-untranslated region (3'-UTR) begins in the mid exon 6, and ends in exon 8. The occurrence of a 14-bp deletion within exon 8, the only mutation known until now in the 3'-UTR, has been considered a risk factor for disease and allograft rejection. To describe the polymorphism within this region, direct sequencing analysis was performed on 120 DNA samples from Portugal and Guinea-Bissau. Results indicate that exon 8 is less conserved than the coding exons. Nine single nucleotide polymorphisms and the previously described 14-bp deletion were found within exon 8 of both populations. Molecular diversity was higher in the Guinean samples than in the Portuguese; however, little differentiation was found among the populations, suggesting that local selection on exon 8 sequence variation is absent. The screening for sequence motifs suggests that polymorphism on this region may be involved in HLA-G post-transcriptional regulation and, therefore, in phenotype variation.
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Affiliation(s)
- M Alvarez
- Department of Anthropology, University of Coimbra, 3000-056 Coimbra, Portugal.
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Leite JS, Isidro G, Martins M, Regateiro F, Albuquerque O, Amaro P, Romãozinho JM, Boavida G, Castro-Sousa F. Is prophylactic colectomy indicated in patients with MYH-associated polyposis? Colorectal Dis 2005; 7:327-31. [PMID: 15932553 DOI: 10.1111/j.1463-1318.2005.00811.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
OBJECTIVES The MYH gene has recently been associated with multiple colorectal tumours. It participates in the DNA base-excision-repair, avoiding mutations in other genes, namely the APC and Ki-ras. Recently, biallelic MYH mutations have been described in patients with attenuated polyposis and in 7.5% with classic polyposis and no detectable APC mutation. The aim of this study was to analyse the incidence of germ-line MYH mutations in selected Portuguese families recorded in a hereditary tumour registry and to evaluate the risk of colorectal cancer in this syndrome. PATIENTS AND METHODS Nineteen APC mutation negative patients, 13 presenting attenuated polyposis and 6 with classic familial adenomatous polyposis (> 100 adenomas), were screened for germline biallelic MYH mutations. RESULTS Biallelic germline mutations in MYH were identified in 9 of the attenuated polyposis and in one of the classic polyposis patients. The mean age at the clinical diagnosis was 50.6 years (from 35 to 69 years); six were men and four women. Five patients belonged to families with affected siblings; three showed evidence for vertical transmission and two had no evidence for familial transmission of the disease. No extra-colonic manifestations were reported. All patients had surgical resections: five total colectomies, four reconstructive proctocolectomies and one left hemicolectomy. Eight patients had associated malignant degeneration: three T3N+, four T3N0 and one T1N+. In the follow-up two patients died due to tumour recurrence. CONCLUSION A large frequency of biallelic MYH mutations (69%) was found in APC mutation negative patients belonging to families with attenuated polyposis; the highest percentage was observed in families presenting evidence for horizontal transmission of the disease. The high percentage of degeneration found in these patients suggests that colonoscopy with polypectomies is not sufficient and prophylactic colectomy is recommended. The identification of MYH associated polyposis is important to evaluate the level of risk, particularly for the siblings.
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Affiliation(s)
- J S Leite
- Coimbra Registry of Hereditary Tumours, Department of Surgery III of the Coimbra University Hospital, Coimbra, Portugal.
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Silva R, Morgado JM, Freitas A, Couceiro A, Orfao A, Regateiro F, Paiva A. Influence of pro- and anti-inflammatory cytokines in Th1 polarization after allogeneic stimulation. Int J Biomed Sci 2005; 1:46-52. [PMID: 23674953 PMCID: PMC3614579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Figures] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The exogenous cytokine milieu can influence Th1/Th2 polarization. Besides the differential functional properties, T lymphocytes also acquire distinct profiles of chemokine receptors. Human Th1 lymphocytes preferentially express CCR5 and CXCR3 while Th2 lymphocytes express CCR3, CCR4 and CCR8. After their polarization into Th1 cells, grafted T lymphocytes mediate the development of graft-vs-host-disease, the major complication after bone marrow transplantation. We performed mixed lymphocyte cultures for ten days, with and without addition of IL-2, IL-4, IL-10, IL-12 and IL-18 at the third and sixth day of cultures. The expression of CXCR3 and CCR5, in CD4(+) and CD8(+) T lymphocytes was evaluated by flow cytometry, before and after ten days of culture. The exogenous addition of IL-2 or IL-12 favoured the Th1/Tc1 phenotype and IL-4 was also capable of inducing Th1 polarization. In opposition to IL-12, IL-18 didn't induce a significant polarization into Th1 phenotype, an effect more similar to that induced by IL-10. This action could explain, at least in part, its possible protective effect in the incidence of acute and chronic graft-versus-host disease after allogeneic stem cell transplantation.
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Affiliation(s)
- R Silva
- Histocompatibility Centre of Coimbra, Portugal
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8
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Santos TA, Dias C, Henriques P, Brito R, Barbosa A, Regateiro F, Santos AA. Cytogenetic analysis of spontaneously activated noninseminated oocytes and parthenogenetically activated failed fertilized human oocytes--implications for the use of primate parthenotes for stem cell production. J Assist Reprod Genet 2003; 20:122-30. [PMID: 12735388 PMCID: PMC3455586 DOI: 10.1023/a:1022630924236] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
PURPOSE [corrected] Spontaneous parthenogenetically activated noninseminated oocytes and failed fertilized oocytes after ART activated by puromycin were studied to assess cleavage ability and the cytogenetic constitution of the resulting embryos. METHODS Failed fertilized oocytes were exposed to puromycin, and whenever activation occurred, they were further cultured until arrest of development. FISH was used to assess the ploidy of spontaneous (group A) and induced parthenotes (group B). RESULTS The mean number of oocytes exposed to puromycin and the percentage and type of activation were identical in IVF and ICSI patients. The more frequent types of activation were one or two pronuclei and one polar body suggesting that retention of the second polar body is a common event after parthenogenetic activation. CONCLUSIONS Retention of the second polar body and chromosome malsegregation were observed after parthenogenetic activation, either spontaneous or induced by puromycin. This means that using parthenogenetic embryos for stem cell research will require great care and attention.
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Affiliation(s)
- T Almeida Santos
- Serviço de Genética Médica da Faculdade de Medicina de Coimbra, Coimbra, Portugal.
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Ameyaw MM, Regateiro F, Li T, Liu X, Tariq M, Mobarek A, Thornton N, Folayan GO, Githang'a J, Indalo A, Ofori-Adjei D, Price-Evans DA, McLeod HL. MDR1 pharmacogenetics: frequency of the C3435T mutation in exon 26 is significantly influenced by ethnicity. Pharmacogenetics 2001; 11:217-21. [PMID: 11337937 DOI: 10.1097/00008571-200104000-00005] [Citation(s) in RCA: 276] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
P-glycoprotein (PGP), the product of the multidrug resistance gene (MDR1), acts as an energy-dependent efflux pump that exports its substrates out of the cell. PGP expression is an important factor regulating absorption of a wide variety of medications. It has also been associated with intrinsic and acquired cross resistance to a number of structurally unrelated anticancer drugs. A single nucleotide polymorphism (SNP) in exon 26 of the MDR1 gene, C3435T, was recently correlated with PGP protein levels and substrate uptake. Individuals homozygous for the T allele have more than four-fold lower PGP expression compared with CC individuals. As overexpression of PGP has been associated with altered drug absorption, therapy-resistant malignancies, and lower concentrations of HIV-1 protease inhibitors, this SNP may provide a useful approach to individualize therapy. To facilitate clinical application throughout the world, 1280 subjects from 10 different ethnic groups were evaluated for this SNP using the polymerase chain reaction-restriction fragment length polymorphism assay and the genotype and allele frequency for each group were ascertained. Marked differences in genotype and allele frequency were apparent between the African populations and the Caucasian/Asian populations (P < 0.0001). The Ghanaian, Kenyan, African American and Sudanese populations studied had frequencies of 83%, 83%, 84% and 73%, respectively, for the C allele. The British Caucasian, Portuguese, South-west Asian, Chinese, Filipino and Saudi populations had lower frequencies of the C allele compared to the African group (48%, 43%, 34%, 53%, 59%, and 55%, respectively). The high frequency of the C allele in the African group implies overexpression of PGP and may have important therapeutic and prognostic implications for use of PGP dependent drugs in individuals of African origin.
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Affiliation(s)
- M M Ameyaw
- University of Aberdeen, Department of Medicine and Therapeutics, Institute of Medical Sciences, Foresterhill, Aberdeen, UK
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Isidro G, Matos P, Almeida S, Claudino S, Marshall B, Soares J, Leite J, Regateiro F, Brito MJ, Giria J, Castro C, Ramos J, Novais L, Morna H, Medeira A, Castedo S, Boavida MG. Eleven novel APC mutations identified in Portuguese FAP families. Hum Mutat 2000; 16:178. [PMID: 10923044 DOI: 10.1002/1098-1004(200008)16:2<178::aid-humu15>3.0.co;2-#] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Germline mutations of the adenomatous polyposis coli (APC) gene are responsible for familial adenomatous polyposis (FAP), an autosomal dominant predisposition to colorectal cancer. In the present study we screened all of the exons of the APC gene in individuals belonging to 85 Portuguese FAP families. We here report eleven novel mutations which are predominantly frameshifts or single base substitutions, resulting in premature stop codons. Hum Mutat 16:178, 2000.
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Affiliation(s)
- G Isidro
- Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisboa.
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Isidro G, Veiga I, Matos P, Almeida S, Bizarro S, Marshall B, Baptista M, Leite J, Regateiro F, Soares J, Castedo S, Boavida MG. Four novel MSH2 / MLH1 gene mutations in portuguese HNPCC families. Hum Mutat 2000; 15:116. [PMID: 10612836 DOI: 10.1002/(sici)1098-1004(200001)15:1<116::aid-humu24>3.0.co;2-q] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Hereditary non-polyposis colorectal cancer (HNPCC) is considered to be determined by germline mutations in the mismatch repair (MMR) genes, especially MSH2 and MLH1. While screening for mutations in these two genes in HNPCC portuguese families, 3 previously unreported MSH2 and 1 MLH1 mutations have been identified in families meeting strict Amsterdam criteria. Hum Mutat 15:116, 2000.
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Affiliation(s)
- G Isidro
- Instituto Nacional de Saúde Dr. Ricardo Jorge, Lisboa, Portugal.
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dos Santos Silva E, Kayademir T, Regateiro F, Machado JC, Savas S, Dobosz T, Blin N, Gött P. Variable distribution of TFF2 (Spasmolysin) alleles in Europeans does not indicate predisposition to gastric cancer. Hum Hered 1999; 49:45-7. [PMID: 9858857 DOI: 10.1159/000022839] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Peptides belonging to the trefoil factor family (TFF) protect the gastrointestinal epithelia. Overexpression of TFFs was observed in pathological conditions such as gastritis, ulceration, metaplasia and neoplasia of the gastrointestinal tract. The aims of this work were to investigate the recently described TFF2 gene polymorphism in different European populations. DNA samples from blood of healthy individuals and gastric cancer patients were genotyped using the polymerase chain reaction. They were compared to a gastric cancer population. The results do not show any significant difference in allelic frequencies between gastric cancer patients and healthy individuals from Portugal. However, the frequency of the two alleles found varies considerably among Europeans.
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Affiliation(s)
- E dos Santos Silva
- Division of Molecular Genetics, Department of Anthropology and Human Genetics, University of Tübingen, Germany
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Damjanovich S, Trón L, Szöllösi J, Zidovetzki R, Vaz WL, Regateiro F, Arndt-Jovin DJ, Jovin TM. Distribution and mobility of murine histocompatibility H-2Kk antigen in the cytoplasmic membrane. Proc Natl Acad Sci U S A 1983; 80:5985-9. [PMID: 6351071 PMCID: PMC534344 DOI: 10.1073/pnas.80.19.5985] [Citation(s) in RCA: 62] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The topographical distributions and mobilities of the murine histocompatibility antigen H-2Kk and of concanavalin A (Con A) binding sites have been studied on a murine lymphoma cell line. The spatial distribution of H-2Kk antigens, the average distance between H-2Kk antigens and Con A binding sites, and the separation of different determinants on the H-2Kk antigen itself were determined by using fluorescence resonance energy-transfer measurements with a dual-laser flow sorter. From the lack of energy transfer between bound monoclonal anti-H-2Kk antibodies conjugated with fluorescein (donor) and rhodamine (acceptor), we conclude that the H-2Kk antigen exists without appreciable clustering on the cell surface. Substantial energy transfer between appropriately labeled Con A and antibodies bound to the H-2Kk antigen shows that the two populations are interspersed. Donor/acceptor pairs of monoclonal antibodies binding to different determinants on the same H-2Kk antigen exhibited a degree of energy transfer indicative of a mean separation of 8.6 nm between the sites. Time-resolved phosphorescence anisotropy measurements with anti-H-2Kk antibodies labeled with eosin or erythrosin yielded rotational mobility information for the antigen-antibody complexes on the cell membrane. The rotational correlation time of 10-20 mus and the finite residual anisotropy are compatible with an uniaxial mode of rotation of monomeric antigen around its transmembrane portion and, thus, provide additional evidence for an unclustered distribution. Capping by rabbit anti-mouse IgG immobilized the antigen-antibody complex. Fluorescence recovery after photobleaching was used to calculate an apparent lateral diffusion coefficient of 5 +/- 3 X 10(-10) cm2 . s-1 for the H-2Kk antigen labeled with fluoresceinated IgG or its corresponding Fab fragment.
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