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1.
Diabet Med ; 34(7): 946-957, 2017 07.
Artigo em Inglês | MEDLINE | ID: mdl-28375555

RESUMO

AIM: To assess the relationships of diabetes and albuminuria with all-cause mortality and cardiovascular disease outcomes in a population without prior cardiovascular disease using data from the Darwin Region Urban Indigenous Diabetes (DRUID) study. METHODS: We conducted a prospective cohort study of 706 participants (aged 15-81 years, 68% women) without prior cardiovascular disease who underwent a 75-g oral glucose tolerance test. Deaths and fatal or non-fatal cardiovascular disease were determined over 7 years, and hazard ratios with 95% CIs and population attributable risks were estimated for baseline glycaemia and albuminuria. RESULTS: Compared with normoglycaemia and after adjustment for age, sex, hypertension, dyslipidaemia and smoking, known diabetes was associated with an adjusted hazard ratio of 4.8 (95% CI 1.5-14.7) for all-cause mortality and 5.6 (95% CI 2.1-15.2) for cardiovascular disease. Compared with normoalbuminuria, the respective adjusted risks for macroalbuminuria were 10.9 (95% CI 3.7-32.1) and 3.9 (95% CI 1.4-10.8). The Adjusted all-cause mortality and cardiovascular disease estimated population attributable risks for diabetes were 27% and 32%, and for albuminuria they were 32% and 21%, respectively. CONCLUSIONS: In our study population, the burden of mortality and cardiovascular disease was largely driven by diabetes and albuminuria. This finding on the influence of diabetes and albuminuria is consistent with reports in other high-risk Indigenous populations and should be better reflected in risk scores and intervention programmes.


Assuntos
Doenças Cardiovasculares/complicações , Angiopatias Diabéticas/complicações , Cardiomiopatias Diabéticas/complicações , Nefropatias Diabéticas/complicações , Insuficiência Renal Crônica/complicações , Saúde da População Urbana , Adolescente , Adulto , Idoso , Albuminúria/etnologia , Albuminúria/etiologia , Austrália/epidemiologia , Doenças Cardiovasculares/epidemiologia , Doenças Cardiovasculares/etnologia , Doenças Cardiovasculares/mortalidade , Estudos de Coortes , Angiopatias Diabéticas/epidemiologia , Angiopatias Diabéticas/etnologia , Angiopatias Diabéticas/mortalidade , Cardiomiopatias Diabéticas/epidemiologia , Cardiomiopatias Diabéticas/etnologia , Cardiomiopatias Diabéticas/mortalidade , Nefropatias Diabéticas/etnologia , Nefropatias Diabéticas/mortalidade , Nefropatias Diabéticas/fisiopatologia , Feminino , Seguimentos , Inquéritos Epidemiológicos , Humanos , Incidência , Masculino , Mortalidade , Havaiano Nativo ou Outro Ilhéu do Pacífico , Prevalência , Modelos de Riscos Proporcionais , Estudos Prospectivos , Insuficiência Renal Crônica/etnologia , Insuficiência Renal Crônica/mortalidade , Insuficiência Renal Crônica/fisiopatologia , Fatores de Risco , Saúde da População Urbana/etnologia
2.
Vox Sang ; 112(3): 279-287, 2017 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-28220510

RESUMO

BACKGROUND AND OBJECTIVES: Variant RHD genes associated with the weak D phenotype can result in complete or partial D-epitope expression on the red cell. This study examines the genetic classification in Australian blood donors with a weak D phenotype and correlates RHD variants associated with the weak D phenotype against D-epitope profile. MATERIALS AND METHODS: Following automated and manual serology, blood samples from donors reported as 'weak D' (n = 100) were RHD genotyped by a commercial SNP-typing platform and Sanger sequencing. Two commercial anti-D antibody kits were used for extended serological testing for D-epitope profiles. RESULTS: Three samples had wild-type RHD exonic sequences, and 97 samples had RHD variants. RHD*weak D type 1, RHD*weak D type 2 or RHD*weak D type 3 was detected in 75 donors. The remaining 22 samples exhibited 17 different RHD variants. One donor exhibited a novel RHD*c.939+3A>C lacking one D-epitope. Weak D types 1·1, 5, 15, 17 and 90 showed a partial D-epitope profile. CONCLUSION: The array of RHD variants detected in this study indicated diversity in the Australian donor population that needs to be accommodated for in future genotyping strategies.


Assuntos
Doadores de Sangue/estatística & dados numéricos , Sistema do Grupo Sanguíneo Rh-Hr/genética , Alelos , Austrália , Sequência de Bases , Transfusão de Sangue , DNA/química , DNA/isolamento & purificação , DNA/metabolismo , Epitopos/imunologia , Epitopos/metabolismo , Éxons , Frequência do Gene , Genótipo , Humanos , Isoanticorpos/sangue , Fenótipo , Polimorfismo de Nucleotídeo Único , Imunoglobulina rho(D)/sangue , Análise de Sequência de DNA , Testes Sorológicos
3.
Diabetes Obes Metab ; 18(11): 1110-1119, 2016 11.
Artigo em Inglês | MEDLINE | ID: mdl-27333970

RESUMO

AIMS: To test whether adjusting insulin and glucagon in response to exercise within a dual-hormone artificial pancreas (AP) reduces exercise-related hypoglycaemia. MATERIALS AND METHODS: In random order, 21 adults with type 1 diabetes (T1D) underwent three 22-hour experimental sessions: AP with exercise dosing adjustment (APX); AP with no exercise dosing adjustment (APN); and sensor-augmented pump (SAP) therapy. After an overnight stay and 2 hours after breakfast, participants exercised for 45 minutes at 60% of their maximum heart rate, with no snack given before exercise. During APX, insulin was decreased and glucagon was increased at exercise onset, while during SAP therapy, subjects could adjust dosing before exercise. The two primary outcomes were percentage of time spent in hypoglycaemia (<3.9 mmol/L) and percentage of time spent in euglycaemia (3.9-10 mmol/L) from the start of exercise to the end of the study. RESULTS: The mean (95% confidence interval) times spent in hypoglycaemia (<3.9 mmol/L) after the start of exercise were 0.3% (-0.1, 0.7) for APX, 3.1% (0.8, 5.3) for APN, and 0.8% (0.1, 1.4) for SAP therapy. There was an absolute difference of 2.8% less time spent in hypoglycaemia for APX versus APN (p = .001) and 0.5% less time spent in hypoglycaemia for APX versus SAP therapy (p = .16). Mean time spent in euglycaemia was similar across the different sessions. CONCLUSIONS: Adjusting insulin and glucagon delivery at exercise onset within a dual-hormone AP significantly reduces hypoglycaemia compared with no adjustment and performs similarly to SAP therapy when insulin is adjusted before exercise.


Assuntos
Técnicas Biossensoriais/instrumentação , Diabetes Mellitus Tipo 1/tratamento farmacológico , Exercício Físico/fisiologia , Glucagon/administração & dosagem , Hipoglicemiantes/administração & dosagem , Sistemas de Infusão de Insulina , Insulina/administração & dosagem , Pâncreas Artificial , Adolescente , Adulto , Técnicas Biossensoriais/métodos , Glicemia/efeitos dos fármacos , Glicemia/metabolismo , Estudos Cross-Over , Diabetes Mellitus Tipo 1/sangue , Relação Dose-Resposta a Droga , Feminino , Glucagon/efeitos adversos , Humanos , Hipoglicemia/induzido quimicamente , Hipoglicemia/prevenção & controle , Hipoglicemiantes/efeitos adversos , Insulina/efeitos adversos , Masculino , Pessoa de Meia-Idade , Pâncreas Artificial/efeitos adversos , Adulto Jovem
4.
Vox Sang ; 108(1): 52-7, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25092430

RESUMO

BACKGROUND AND OBJECTIVES: An Australian Caucasian blood donor consistently presented a serology profile for the Duffy blood group as Fy(a+b+) with Fy(a) antigen expression weaker than other examples of Fy(a+b+) red cells. Molecular typing studies were performed to investigate the reason for the observed serology profile. MATERIAL AND METHODS: Blood group genotyping was performed using a commercial SNP microarray platform. Sanger sequencing was performed using primer sets to amplify across exons 1 and 2 of the FY gene and using allele-specific primers. RESULTS: The propositus was genotyped as FY*A/B, FY*X heterozygote that predicted the Fy(a+b+(w) ) phenotype. Sequencing identified the 265T and 298A variants on the FY*A allele. This link between FY*A allele and 265T was confirmed by allele-specific PCR. CONCLUSION: The reduced Fy(a) antigen reactivity is attributed to a FY*A allele-carrying 265T and 298A variants previously defined in combination only with the FY*B allele and associated with weak Fy(b) antigen expression. This novel allele should be considered in genotyping interpretative algorithms for generating a predicted phenotype.


Assuntos
Doadores de Sangue , Sistema do Grupo Sanguíneo Duffy/genética , Polimorfismo de Nucleotídeo Único , Algoritmos , Alelos , Austrália , Genótipo , Técnicas de Genotipagem/métodos , Humanos , Dados de Sequência Molecular , Fenótipo , População Branca/genética
5.
Vox Sang ; 109(3): 296-303, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25900316

RESUMO

BACKGROUND AND OBJECTIVES: Duffy blood group phenotypes can be predicted by genotyping for single nucleotide polymorphisms (SNPs) responsible for the Fy(a) /Fy(b) polymorphism, for weak Fy(b) antigen, and for the red cell null Fy(a-b-) phenotype. This study correlates Duffy phenotype predictions with serotyping to assess the most reliable procedure for typing. MATERIALS AND METHODS: Samples, n = 155 (135 donors and 20 patients), were genotyped by high-resolution melt PCR and by microarray. Samples were in three serology groups: 1) Duffy patterns expected n = 79, 2) weak and equivocal Fy(b) patterns n = 29 and 3) Fy(a-b-) n = 47 (one with anti-Fy3 antibody). RESULTS: Discrepancies were observed for five samples. For two, SNP genotyping predicted weak Fy(b) expression discrepant with Fy(b-) (Group 1 and 3). For three, SNP genotyping predicted Fy(a) , discrepant with Fy(a-b-) (Group 3). DNA sequencing identified silencing mutations in these FY*A alleles. One was a novel FY*A 719delG. One, the sample with the anti-Fy3, was homozygous for a 14-bp deletion (FY*01N.02); a true null. CONCLUSION: Both the high-resolution melting analysis and SNP microarray assays were concordant and showed genotyping, as well as phenotyping, is essential to ensure 100% accuracy for Duffy blood group assignments. Sequencing is important to resolve phenotype/genotype conflicts which here identified alleles, one novel, that carry silencing mutations. The risk of alloimmunisation may be dependent on this zygosity status.


Assuntos
Algoritmos , Sistema do Grupo Sanguíneo Duffy/genética , Receptores de Superfície Celular/genética , Alelos , Sequência de Bases , Estudos de Associação Genética , Humanos , Dados de Sequência Molecular , Análise de Sequência com Séries de Oligonucleotídeos , Transição de Fase , Reação em Cadeia da Polimerase , Polimorfismo de Nucleotídeo Único , Análise de Sequência de DNA
6.
Eur J Cancer Care (Engl) ; 23(6): 716-20, 2014 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-25238027

RESUMO

Since its inception in 1991, Australia's organised approach to cervical screening, the National Cervical Screening Program (NCSP), has seen a 50% reduction in both incidence and mortality from cervical cancer in Australia. However, Indigenous Australian women continue to experience a disproportionately higher burden of cervical cancer. No national data on screening participation of Indigenous women currently exist, in large part because pathology forms, the primary source of data for Pap Test Registers (PTR), do not record Indigenous status. While including Indigenous status on pathology forms is the obvious solution for producing essential information about cervical screening of Indigenous women, this will require an appropriate consultative process and it will be many years before reliable data are available. One interim option being explored is the feasibility of linking the PTR to another data source which includes Indigenous status, such as hospital data. However, despite its promise, there remain major impediments to obtaining useful linked data in Australia, and it continues to be unclear whether such an approach is viable for routine reporting. If we are to understand and improve cervical screening participation and outcomes for Indigenous women in the foreseeable future, Australia needs to act now to include Indigenous status in pathology forms and (subsequently) PTRs.


Assuntos
Programas de Rastreamento/métodos , Programas Nacionais de Saúde/normas , Havaiano Nativo ou Outro Ilhéu do Pacífico , Teste de Papanicolaou , Neoplasias do Colo do Útero/diagnóstico , Adulto , Austrália , Feminino , Humanos , Programas de Rastreamento/normas , Pessoa de Meia-Idade , Aceitação pelo Paciente de Cuidados de Saúde , Avaliação de Programas e Projetos de Saúde , Neoplasias do Colo do Útero/etnologia , Esfregaço Vaginal
7.
Intern Med J ; 43(9): 987-92, 2013 09.
Artigo em Inglês | MEDLINE | ID: mdl-23692462

RESUMO

BACKGROUND: Statins are associated with skeletal muscle adverse effects. These are generally considered mild and reversible, with more severe toxicity occurring rarely. There is little known regarding statin myotoxicity in Aboriginal and Torres Strait Islander Australians who are at high cardiovascular risk and likely to receive statins. AIMS: To describe features of serious statin-associated myotoxicity (SSAM) occurring in Indigenous Australians and increase awareness of this condition. METHODS: Observational case series of SSAM in Aboriginal or Torres Strait Islanders. Cases were identified from personal clinical experience, referrals, reports to the Therapeutic Goods Administration, medical literature, an Internet search and reports from a histopathology laboratory. Information was collected onto a standardised data collection form. RESULTS: Fifteen cases of serious myotoxicity in Aboriginal or Torres Strait Islanders exposed to statins were identified from 2006 to 2012. The mean age was 55 (range 35-69). Painless weakness was the most common presentation. Interacting drugs were involved in seven cases. Biopsies were done in eight cases, three showed inflammatory polymyositis and five necrotising myositis. Three patients died and two had permanent severe disability. Resolution of symptoms after statin cessation was variable. CONCLUSIONS: SSAM has occurred in the Indigenous Australian population with some fatalities. Awareness of the potential for SSAM is essential for early recognition and effective management to reduce probability of avoidable catastrophic harm. Safe, as well as effective use of medication, is essential for optimum health outcomes. Effective pharmacovigilance and therapeutic risk management are important for Aboriginal and Torres Strait Islander Australians.


Assuntos
Inibidores de Hidroximetilglutaril-CoA Redutases/efeitos adversos , Músculo Esquelético/efeitos dos fármacos , Músculo Esquelético/patologia , Havaiano Nativo ou Outro Ilhéu do Pacífico/etnologia , Rabdomiólise/induzido quimicamente , Rabdomiólise/etnologia , Adulto , Idoso , Austrália , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Rabdomiólise/diagnóstico
8.
Intern Med J ; 42(7): e165-73, 2012 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-21627745

RESUMO

BACKGROUND: Indigenous Australians have higher prevalence of chronic diseases and worse acute care outcomes than other Australians. The extent to which higher chronic disease comorbidity levels are responsible for their worse outcomes is not clear, and the performance of comorbidity indices has not been assessed for this population with very high comorbidity levels. METHODS: Using hospital separations data, the Charlson and Elixhauser comorbidity indices were used to measure chronic disease prevalence in 2035 indigenous and non-indigenous patients hospitalised after their first acute myocardial infarction (AMI) in the Northern Territory of Australia between 1992 and 2004, and to adjust for comorbidity in multivariate analysis of mortality outcomes (in-hospital and long-term deaths from coronary heart disease and all causes). Index performance was assessed by the difference between C statistic, Akaike information criterion statistic and estimate of excess indigenous mortality in models with and without comorbidity adjustment. RESULTS: Comorbidity index scores were higher for indigenous than non-indigenous patients and increased considerably over time, at least partly because of information bias. Indigenous patients' higher risk of in-hospital all-cause death was almost fully explained by their higher comorbidity levels. Their higher risk of long-term coronary heart disease and all-cause death was partially explained by higher comorbidity levels. Charlson and Elixhauser indices performed satisfactorily and similarly in this population. CONCLUSION: Comorbidity indices performed well in a population with very high chronic disease prevalence. After adjusting for comorbidity, short-term outcomes were similar for indigenous and non-indigenous AMI patients, but comorbidity at the time of the acute episode only partly explained the worse long-term outcomes for indigenous patients.


Assuntos
Mortalidade Hospitalar/tendências , Infarto do Miocárdio/etnologia , Havaiano Nativo ou Outro Ilhéu do Pacífico/etnologia , Avaliação de Resultados em Cuidados de Saúde/métodos , Austrália/etnologia , Comorbidade , Diabetes Mellitus/etnologia , Diabetes Mellitus/mortalidade , Feminino , Humanos , Pneumopatias/etnologia , Pneumopatias/mortalidade , Masculino , Pessoa de Meia-Idade , Infarto do Miocárdio/mortalidade , Northern Territory/etnologia , Avaliação de Resultados em Cuidados de Saúde/tendências , Grupos Populacionais/etnologia
9.
Nat Commun ; 11(1): 2126, 2020 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-32358532

RESUMO

Many inland waters exhibit complete or partial desiccation, or have vanished due to global change, exposing sediments to the atmosphere. Yet, data on carbon dioxide (CO2) emissions from these sediments are too scarce to upscale emissions for global estimates or to understand their fundamental drivers. Here, we present the results of a global survey covering 196 dry inland waters across diverse ecosystem types and climate zones. We show that their CO2 emissions share fundamental drivers and constitute a substantial fraction of the carbon cycled by inland waters. CO2 emissions were consistent across ecosystem types and climate zones, with local characteristics explaining much of the variability. Accounting for such emissions increases global estimates of carbon emissions from inland waters by 6% (~0.12 Pg C y-1). Our results indicate that emissions from dry inland waters represent a significant and likely increasing component of the inland waters carbon cycle.

10.
J Psychosom Obstet Gynaecol ; 28(1): 49-54, 2007 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-17454513

RESUMO

OBJECTIVE: To assess the impact that education through participation in a depression screening program has on mental health literacy and help seeking behavior in perinatal women. METHODS: Responses to a hypothetical case of depression, help seeking behavior, and screening levels for risk of depression using the Edinburgh Postnatal Depression Scale were compared between two groups of postnatal women; one group who had participated in a screening program and the other who had not. Those who participated in the screening program were also asked to evaluate the educational material they had received. RESULTS: A total of 1309 women, broadly representative of postnatal women, answered one or more questionnaires. Those who had participated in the screening program were better able to recognize depression in a hypothetical case, and also assess their own mental state more appropriately. Those women who had been part of the program and did not score high on the EPDS were less likely to seek help, were more satisfied when they did and tended to benefit more from the educational booklet. CONCLUSIONS: Participation in a screening program with educational material had significant benefits for mental health literacy and the health service use for perinatal women at risk for depression.


Assuntos
Depressão Pós-Parto/psicologia , Escolaridade , Conhecimentos, Atitudes e Prática em Saúde , Saúde Mental , Mães/psicologia , Mães/estatística & dados numéricos , Adaptação Psicológica , Austrália , Feminino , Humanos , Avaliação das Necessidades , Aceitação pelo Paciente de Cuidados de Saúde/psicologia , Gravidez , Autoavaliação (Psicologia) , Inquéritos e Questionários
11.
Intern Med J ; 36(8): 498-505, 2006 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-16866654

RESUMO

Indigenous Australians with cancer are diagnosed with more advanced disease and have lower survival than other Australians. To investigate reasons for these differences. Retrospective cohort study of 1197 indigenous and nonindigenous people in the Northern Territory diagnosed with cancers of the colon and rectum, lung, breast, cervix and non-Hodgkin lymphoma between 1991 and 2000. Outcome measures were stage at diagnosis and relative risk of cancer death. Indigenous people compared with nonindigenous people had higher relative odds of advanced stage of cancer at diagnosis (relative odds 1.9, 95% CI 1.3-2.7) for four cancers but lower relative odds for lung cancer (relative odds 0.3, 95% CI 0.2-0.5). None of the potentially contributing factors examined could explain this difference. Risk of cancer death (adjusted for cancer type and age and stage at diagnosis) was higher in indigenous than in nonindigenous people (relative risk 1.7, 95% CI 1.4-2.1). This difference, however, was confined to indigenous people with an indigenous first language (relative risk 2.9, 95% CI 2.2-3.8). Adjustment for cancer treatment variables further reduced but did not eliminate this higher risk of death. Although more advanced stage at diagnosis appeared to be a sufficient explanation for poorer cancer outcome in indigenous people whose first language was English, poorer treatment also contributed to, but was still not sufficient to explain, poorer outcome in those who had an indigenous first language. Other factors, possibly including communication difficulties, knowledge of and attitudes to cancer symptoms and treatment and social and cultural 'distance' from mainstream health services, may also be involved.


Assuntos
Serviços de Saúde do Indígena/normas , Neoplasias/diagnóstico , Neoplasias/terapia , Grupos Populacionais/etnologia , Estudos de Coortes , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Neoplasias/epidemiologia , Northern Territory/etnologia , Estudos Retrospectivos , Taxa de Sobrevida/tendências
12.
Leukemia ; 7(10): 1514-20, 1993 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-8412313

RESUMO

Techniques based on the polymerase chain reaction (PCR) to detect rearrangement of the immunoglobulin or T-cell receptor genes can detect residual disease in leukemia and hence have the potential to improve prognosis and treatment. Such techniques may involve either detection of monoclonality, which is simple and quick but has limited sensitivity, or specific detection of the leukaemic clone, which is complex and time-consuming but has high sensitivity. The PCR was used to detect monoclonal rearrangements of the immunoglobulin heavy chain and/or T-cell receptor gamma chain genes in archival marrow specimens from 185 children with acute lymphoblastic leukemia who achieved remission during two consecutive Australasian trials of treatment. A monoclonal rearrangement was detected at diagnosis in 152 (84%) patients and in these patients detection of the same rearrangement in the remission marrow at the end of induction therapy was highly significantly correlated with outcome. There were nine patients in whom polymerase chain reaction showed only the monoclonal rearrangement and eight (89%) relapsed; there were 26 patients in whom PCR showed the leukemic monoclonal rearrangement as well as polyclonal rearrangements from normal lymphocytes and 12 (46%) relapsed; and there were 117 patients in whom only polyclonal rearrangements could be detected and only 29 (25%) relapsed. In patients who relapsed, remissions were shorter in those patients in whom the leukemic rearrangements had been detected in the remission marrow. Treatment in the later trial was more intensive than in the earlier trial, the results were better and the PCR detected the leukemic rearrangement in the remission marrow in significantly fewer patients. We conclude that detection by PCR of the monoclonal gene rearrangement of the leukemic clone in remission marrow indicates that numerous leukemic cells have survived induction therapy and is a good predictor of relapse. However, due to limited sensitivity of the test, failure to detect the leukemic clone by PCR is not a sufficiently good predictor of ultimate cure.


Assuntos
Medula Óssea/fisiologia , Genes de Imunoglobulinas/genética , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Medula Óssea/química , Células da Medula Óssea , Células Clonais/fisiologia , DNA de Neoplasias/análise , DNA de Neoplasias/genética , Amplificação de Genes , Rearranjo Gênico/genética , Rearranjo Gênico da Cadeia gama dos Receptores de Antígenos dos Linfócitos T/genética , Humanos , Cadeias Pesadas de Imunoglobulinas/genética , Linfócitos/fisiologia , Reação em Cadeia da Polimerase , Leucemia-Linfoma Linfoblástico de Células Precursoras/sangue , Leucemia-Linfoma Linfoblástico de Células Precursoras/patologia , Valor Preditivo dos Testes , Prognóstico , Receptores de Antígenos de Linfócitos T gama-delta/genética , Indução de Remissão
13.
Endocrinology ; 138(7): 3077-80, 1997 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-9202257

RESUMO

Corticosteroid hormone action is controlled at a pre-receptor level by the activity of two isoforms of 11beta-hydroxysteroid dehydrogenase (11beta-HSD), catalyzing the interconversion of hormonally active cortisol to inactive cortisone. In particular 11beta-HSD2 protects the mineralocorticoid receptor (MR) from glucocorticoid excess, enabling aldosterone to interact with the MR. We have analyzed the subcellular localization of 11beta-HSD2 in relation to the expression of the MR in human colon and placenta. 3H-aldosterone binding studies confirmed expression of the MR in human colon but not term placental trophoblast. Enzyme activity studies and Western blot analyses carried out on subcellular fractions confirmed the presence of 11beta-HSD2 in microsomes. In colon, but not placenta, 11beta-HSD2 was also localized to the microsome-free, nuclear fraction. Protection upon the MR by 11beta-HSD2 in "classical" mineralocorticoid target tissues such as colon can be subserved at both a nuclear and extra-nuclear level. Tissue specific factors are responsible for the subcellular localization of 11beta-HSD2 and we postulate that one such factor may be the MR itself.


Assuntos
Hidroxiesteroide Desidrogenases/metabolismo , Isoenzimas/metabolismo , Receptores de Mineralocorticoides/metabolismo , 11-beta-Hidroxiesteroide Desidrogenases , Aldosterona/metabolismo , Sítios de Ligação , Colo/enzimologia , Cortisona/metabolismo , Decídua/enzimologia , Feminino , Humanos , Hidrocortisona/metabolismo , Cinética , NAD/metabolismo , NADP/metabolismo , Placenta/enzimologia , Frações Subcelulares/enzimologia
14.
J Clin Endocrinol Metab ; 83(12): 4490-7, 1998 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-9851798

RESUMO

In adult life, the type 2 isozyme of 11beta-hydroxysteroid dehydrogenase (11betaHSD2) protects the mineralocorticoid receptor (MR) from glucocorticoid by inactivating cortisol to cortisone. 11betaHSD2 activity has been reported in human fetal tissues, where glucocorticoids may impair fetal growth yet are also required for normal fetal development. Using digoxigenin-labeled complementary ribonucleic acid (RNA) probes and an in-house 11betaHSD2 antiserum, we have analyzed the expression of 11betaHSD2, MR, and glucocorticoid receptor (GR) in human fetal tissues of gestational age 6-17 weeks (n=15). 11BetaHSD2 expression was absent at gestational age 6+ weeks, but was expressed in abundance in many fetal tissues between 8-12 weeks. At this time, 11betaHSD2 colocalized with GR messenger RNA (mRNA) expression in metanephros, gut, muscle, spinal cord and dorsal root ganglia, periderm, sex chords of testis, and adrenal. In particular within fetal kidney, intense expression of 11betaHSD2 and GR mRNA was observed over Bowman's capsule and the vascular tufts of developing glomeruli as they migrated from the surface of the kidney to the inner cortex. Only lung and adrenal medullary rests demonstrated high levels of GR mRNA but low levels of 11betaHSD2. 11BetaHSD2 mRNA and immunoreactivity staining patterns were similar, with the exception of the fetal adrenal, where mRNA was localized to the outer definitive zone but immunoreactivity was localized to the inner fetal zone. Colocalization of 11betaHSD2 (and GR mRNA) with MR mRNA was observed principally within epithelial cells of collecting ducts, particularly after 16 weeks gestation when the pattern of distribution of 11betaHSD2 became more adult in nature. High levels of MR mRNA were observed within developing bone. The data indicate that 11betaHSD2 in fetal life principally modulates ligand access to the GR in most fetal tissues, notably glomeruli and tubules in the developing kidney, testis, and periderm, and this may be have ramifications for fetal sodium homeostasis and differentiation. The development of tissues previously shown to have a critical requirement for glucocorticoids, such as lung and adrenal medulla, is facilitated by the expression of GR mRNA, but not 11betaHSD2. The expression of MR mRNA in high abundance in bone suggests a role for corticosteroids in human bone development, and the low/absent expression of 11betaHSD2 at this site suggests that it is functionally acting as a GR.


Assuntos
Feto/metabolismo , Hidroxiesteroide Desidrogenases/metabolismo , Isoenzimas/metabolismo , Receptores de Glucocorticoides/metabolismo , Receptores de Mineralocorticoides/metabolismo , 11-beta-Hidroxiesteroide Desidrogenases , Feminino , Idade Gestacional , Humanos , Hidroxiesteroide Desidrogenases/genética , Imuno-Histoquímica , Hibridização In Situ , Isoenzimas/genética , Gravidez , Primeiro Trimestre da Gravidez , RNA Mensageiro/metabolismo , Receptores de Mineralocorticoides/genética , Distribuição Tecidual
15.
Am J Psychiatry ; 143(8): 987-92, 1986 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-3728744

RESUMO

This paper focuses on the etiology, recognition, and treatment of established pathological grief reactions in parents bereaved by stillbirth. Bereavement in this situation differs in a number of aspects from conventional bereavement, and these dictate that the style of grief therapy be modified. Four such aspects are discussed: the unique psychological properties of the lost object, the complexity of the emotional attachment that expectant parents develop toward their unborn child, the unusual psychobiological climate in which the loss occurs, and the sociocultural definition of the meaning and significance of the loss.


Assuntos
Transtorno Depressivo/diagnóstico , Morte Fetal , Pesar , Ira , Terapia Comportamental , Transtorno Depressivo/etiologia , Transtorno Depressivo/terapia , Diagnóstico Diferencial , Fantasia , Feminino , Culpa , Humanos , Apego ao Objeto , Pais/psicologia , Gravidez , Projeção , Psicoterapia , Psicoterapia de Grupo , Autoimagem , Transferência Psicológica
16.
Biotechniques ; 13(3): 444-9, 1992 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-1389177

RESUMO

We describe a general method to quantitate the total number of initial targets present in a sample using limiting dilution, PCR and Poisson statistics. The DNA target for the PCR was the rearranged immunoglobulin heavy chain (IgH) gene derived from a leukemic clone that was quantitated against a background of excess rearranged IgH genes from normal lymphocytes. The PCR was optimized to provide an all-or-none end point at very low DNA target numbers. PCR amplification of the N-ras gene was used as an internal control to quantitate the number of potentially amplifiable genomes present in a sample and hence to measure the extent of DNA degradation. A two-stage PCR was necessary owing to competition between leukemic and non-leukemic templates. Study of eight leukemic samples showed that approximately two potentially amplifiable leukemic IgH targets could be detected in the presence of 160,000 competing non-leukemic genomes. The method presented quantitates the total number of initial DNA targets present in a sample, unlike most other quantitation methods that quantitate PCR products. It has wide application, because it is technically simple, does not require radioactivity, addresses the problem of excess competing targets and estimates the extent of DNA degradation in a sample.


Assuntos
DNA de Neoplasias/análise , Rearranjo Gênico de Cadeia Pesada de Linfócito B , Genes de Imunoglobulinas , Genes ras , Cadeias Pesadas de Imunoglobulinas/genética , Reação em Cadeia da Polimerase , Leucemia-Linfoma Linfoblástico de Células Precursoras/genética , Sequência de Bases , Humanos , Dados de Sequência Molecular , Distribuição de Poisson , Moldes Genéticos
17.
J Histochem Cytochem ; 36(10): 1251-4, 1988 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-3418106

RESUMO

Tissue kallikrein (E.C. 3.4.21.35) and arginine esterase A, another closely related, kinin-generating serine protease, have been localized by immunocytochemistry in rat kidney, using monoclonal antibodies that do not crossreact with other kallikrein-related enzymes or with tonin. Kallikrein was present primarily in the apical cytoplasm of the connecting tubule and the cortical collecting duct. Esterase A, on the other hand, was present primarily in the basolateral region of both proximal and distal straight tubules in the outer medulla and medullary rays. In addition, esterase A was demonstrable in distal convoluted tubules and, to a lesser extent, in proximal convoluted tubules. The presence of different kinin-generating enzymes at these sites would permit the formation of kinins from appropriate substrates on both the vascular and luminal poles of separate segments of the kidney tubule.


Assuntos
Anticorpos Monoclonais/imunologia , Hidrolases de Éster Carboxílico/análise , Calicreínas/análise , Rim/análise , Animais , Hidrolases de Éster Carboxílico/imunologia , Reações Cruzadas , Feminino , Calicreínas/imunologia , Rim/enzimologia , Ratos , Ratos Endogâmicos
18.
Mol Cell Endocrinol ; 127(2): 121-8, 1997 Mar 28.
Artigo em Inglês | MEDLINE | ID: mdl-9099907

RESUMO

11beta-hydroxysteroid dehydrogenase (11beta-HSD) catalyzes the interconversion of cortisol to hormonally inactive cortisone (corticosterone (B) to 11-dehydrocorticosterone (A) in rodents), and as such is established as a pre-receptor signalling pathway for corticosteroid hormone action. To further evaluate the role of this enzyme in adult and fetal life we have characterized two isoforms of 11beta-HSD in mouse tissues. Mouse 'liver' or type 1 11beta-HSD is a bi-directional dehydrogenase/oxo-reductase (K(m) for B 1.9 microM, K(m) for A 0.73 microM). Oxo-reductase activity utilized only NADPH as a co-factor, whilst dehydrogenase activity increased with both NAD or NADP. Mouse 'kidney' or 11beta-HS3D2 activity was NAD-dependent with a K(m) for B of 0.11 microM. Dexamethasone was not a substrate. Using an in-house mouse 11beta-HSD2 cDNA and NAD-dependent activity studies, 11 beta-HSD2 was expressed in epithelial cells of colon, renal collecting ducts, ovary, and adrenal, but was absent in liver, spleen, testis and heart. With the exception of gonadal tissues, activity and mRNA levels were consistently higher in adult male versus female tissues. In fetal kidney and colon there was absent/low levels of 11beta-HSD2 expression from fetal day 15 to term (day 19/20). Placental 11beta-HSD2 mRNA and activity were highest on fetal day 13/14 and fell progressively to undetectable levels by term. Two isoforms of 11beta-HSD are present in mouse tissues in accordance with other mammalian species. The sexual-dimorphic expression 11 beta-HSD2 in kidney and colon may reflect male-female differences in sodium homeostasis, and the absent expression of 11 beta-HSD2 in late gestation may facilitate glucocorticoid-dependent maturation of mouse fetal tissues.


Assuntos
Regulação da Expressão Gênica no Desenvolvimento/fisiologia , Regulação Enzimológica da Expressão Gênica/fisiologia , Hidroxiesteroide Desidrogenases/genética , Caracteres Sexuais , 11-beta-Hidroxiesteroide Desidrogenases , Animais , Clonagem Molecular , Feminino , Hidroxiesteroide Desidrogenases/análise , Hidroxiesteroide Desidrogenases/metabolismo , Isoenzimas , Rim/química , Rim/embriologia , Rim/enzimologia , Cinética , Masculino , Camundongos , Camundongos Endogâmicos BALB C , NAD/metabolismo , NADP/metabolismo , Especificidade de Órgãos , Gravidez , RNA Mensageiro/análise , Análise de Sequência de DNA , Homologia de Sequência do Ácido Nucleico
19.
Obstet Gynecol ; 70(3 Pt 2): 495-7, 1987 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-3627611

RESUMO

As many as one-third of women bereaved by stillbirth suffer psychological decompensation, and a similar proportion see the obstetric team as unsupportive. A case history is presented of a woman who suffered severe psychiatric illness after delivering a stillborn anencephalic infant. This paper discusses the powerful influence that the behavior of the obstetric team in the delivery room can exert on the long-term outcome of the crisis. This case highlights a number of practical aspects of the psychological management of bereavement by stillbirth.


Assuntos
Anencefalia , Atitude do Pessoal de Saúde , Morte Fetal , Pesar , Transtornos Psicóticos/etiologia , Transtornos Puerperais/psicologia , Adulto , Parto Obstétrico , Feminino , Humanos , Gravidez
20.
Ann Thorac Surg ; 23(2): 158-62, 1977 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-836105

RESUMO

A case is reported of ventricular septal defect resulting from septal infarction following repair of a tetralogy of Fallot. The infarct probably resulted from division of a septal coronary artery during resection of the hypertrophied infundibulum. The superficial position of the septal artery on the right side of the septum in tetralogy makes it surprising that this complication has not been previously reported.


Assuntos
Comunicação Interventricular/etiologia , Infarto do Miocárdio/complicações , Complicações Pós-Operatórias , Tetralogia de Fallot/cirurgia , Criança , Feminino , Humanos
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