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1.
J Obstet Gynaecol ; 35(1): 60-3, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25020211

RESUMO

The current paper describes the age, period and cohort effects on breast cancer mortality in Taiwan. Female breast cancer mortality data were collected from the Taiwan death registries for 1971-2010. The annual percentage changes, age- standardised mortality rates (ASMR) and age-period-cohort model were calculated. The mortality rates increased with advancing age groups when fixing the period. The percentage change in the breast cancer mortality rate increased from 54.79% at aged 20-44 years, to 149.78% in those aged 45-64 years (between 1971-75 and 2006-10). The mortality rates in the 45-64 age group increased steadily from 1971 to 1975 and 2006-10. The 1951 birth cohorts (actual birth cohort; 1947-55) showed peak mortalities in both the 50-54 and 45-49 age groups. We found that the 1951 birth cohorts had the greatest mortality risk from breast cancer. This might be attributed to the DDT that was used in large amounts to prevent deaths from malaria in Taiwan. However, future researches require DDT data to evaluate the association between breast cancer and DDT use.


Assuntos
Neoplasias da Mama/mortalidade , Adulto , Idoso , Idoso de 80 Anos ou mais , Neoplasias da Mama/induzido quimicamente , Estudos de Coortes , DDT/toxicidade , Feminino , Humanos , Pessoa de Meia-Idade , Mortalidade/tendências , Taiwan/epidemiologia , Adulto Jovem
2.
Transplant Proc ; 42(9): 3559-61, 2010 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-21094815

RESUMO

Posttransplantation diabetes mellitus (PTDM) is a major complication in renal transplant recipients. Some studies have demonstrated that tumor necrosis factor alpha (TNF-α) expression and its genetic polymorphism are associated with diabetes mellitus. We investigated this association in Asian renal transplant recipients. Polymerase chain reaction-restriction-fragment length polymorphism was used to measure TNF-α G-238A and G-308A gene polymorphisms among 241 nonposttransplantation diabetic subjects and 73 PTDM patients. PTDM patients showed higher values of body weight and body mass index (BMI) than the non-PTDM group. However, no significant association was observed between TNF-α G-238A and TNF-α G-308A polymorphisms with PTDM incidence, gender, age at transplantation, follow-up duration, BMI, or type of immunosuppression.


Assuntos
Diabetes Mellitus/etnologia , Diabetes Mellitus/genética , Transplante de Rim/efeitos adversos , Polimorfismo Genético , Regiões Promotoras Genéticas , Fator de Necrose Tumoral alfa/genética , Adulto , Idoso , Povo Asiático/genética , Feminino , Frequência do Gene , Predisposição Genética para Doença , Humanos , Transplante de Rim/etnologia , Masculino , Pessoa de Meia-Idade , Fenótipo , Reação em Cadeia da Polimerase , Medição de Risco , Fatores de Risco , Taiwan , Adulto Jovem
3.
Neurogastroenterol Motil ; 22(5): 546-51, e119, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-20059761

RESUMO

BACKGROUND: Several studies have supported the hypothesis of different presentations in the autonomic nervous system (ANS) between cardiac and gastric vagal activity. Due to the regionality of the ANS, different responses among different organ systems to the same stimulation (such as a meal) are quite possible. METHODS: In this study we monitored the postprandial changes of heart rate variability (HRV) and gastrointestinal (GI) hormones to determine whether both responded in a similar pattern. Twenty-two healthy volunteers (6 males and 16 females) were enrolled. After recording a baseline ECG rhythm, further recordings were made at 20 min intervals for 120 min after a test meal. Serum human pancreatic polypeptide (PP), leptin, and total and active ghrelin levels were measured. KEY RESULTS: After the meal, HR increased significantly from baseline at each time point, except for 20 min after the meal. The high frequency (HF) power decreased significantly from 40 min to 120 min after the meal. In addition, the low frequency (LF) power also decreased significantly from 60 min to 120 min. However, the LF:HF ratio increased significantly from 20 min to 120 min. There was a marked increase (>2 fold) of PP at 20 min after the meal, and the increase was sustained throughout the test period. CONCLUSIONS & INFERENCES: These findings suggest that HRV reflects cardiac, but not equivalently, abdominovagal activity. Therefore, HRV as an abdominovagal activity measurement in patients with GI functional problems should be used with caution, and other markers such as PP should be included.


Assuntos
Sistema Nervoso Autônomo/fisiologia , Frequência Cardíaca/fisiologia , Período Pós-Prandial/fisiologia , Nervo Vago/fisiologia , Adulto , Pressão Sanguínea/fisiologia , Eletrocardiografia , Ensaio de Imunoadsorção Enzimática , Feminino , Grelina/sangue , Humanos , Individualidade , Leptina/sangue , Masculino , Pessoa de Meia-Idade , Polipeptídeo Pancreático/sangue
4.
Osteoarthritis Cartilage ; 17(4): 441-7, 2009 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-18990590

RESUMO

OBJECTIVE: Both animal and human studies using magnetic resonance imaging (MRI) show that cartilage degeneration increases the T2 value. However, it is unclear whether the T2 value correlates linearly with water content in cartilage with osteoarthritis. The purpose of this study was to investigate the relationship between the T2 value and water content using an animal model of cartilage injury measured at 4.7 T. DESIGN: Thirty Sprague Dawley rats were randomly separated into three groups (n=10 for each group). Group 1 rats were not operated on (control). Group 2 rats received a sham operation, and group 3 rats received an anterior cruciate ligament (ACL) transection. Six rats of each group were randomly assigned to T2 measurement and later subjected to ex vivo analysis of the relative water content of the knee cartilage. The other four rats in each group were killed, and the severity of cartilage degeneration was examined histologically. The knees of the six rats in the ACL transection group were imaged sequentially 4 and 13 weeks after ACL transection, and the relative water content was measured at 13 weeks. RESULTS: The cartilage T2 value was significantly higher 4 and 13 weeks after ACL transection in the operated knees than in the knees of the control and sham groups. The cartilage T2 value was significantly higher at 13 weeks than at 4 weeks in the operated knees. The T2 value was strongly positively correlated with the relative water content (R=0.885, P<0.0001). CONCLUSION: The trend of changes in the T2 values is consistent with an increase in the relative water content in our cartilage degeneration model. This model has potential use for the clinical evaluation of osteoarthritis.


Assuntos
Artrite Experimental/complicações , Doenças das Cartilagens/etiologia , Cartilagem Articular/patologia , Edema/etiologia , Osteoartrite/complicações , Animais , Lesões do Ligamento Cruzado Anterior , Artrite Experimental/etiologia , Água Corporal , Doenças das Cartilagens/diagnóstico , Edema/diagnóstico , Processamento de Imagem Assistida por Computador/métodos , Imageamento por Ressonância Magnética/métodos , Masculino , Ratos , Ratos Sprague-Dawley
5.
Nuklearmedizin ; 46(5): 169-74, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17938749

RESUMO

UNLABELLED: The aim of this study was designed to investigate the usefulness of thallium-201 single photon emission computed tomography (SPECT) in predicting response of intensity-modulated radiation therapy (IMRT) for recurrent oral squamous cell carcinoma (OSCC). PATIENTS, METHODS: Thirty-one patients with histologically proven recurrent OSCC were recruited. Before IMRT, all patients underwent SPECT at 15 min and 120 min after intravenous injection 111 MBq of thallous chloride ((201)Tl). Tumour uptake was measured with the semiquantitative early ratio (ER), delayed ratio (DR), and retention index (RI). The patients were classified into responder (complete response and partial response) and non-responder (stable disease and progressive disease) groups according to the tumour response evaluated by the Response Evaluation Criteria in Solid Tumors guidelines. RESULTS: As comparing DR and RI between the two groups, both parameters were significantly higher in the responder group. When a DR of 1.75 was used as a cutoff value for the responders, the receiver operating characteristic (ROC) analyses revealed sensitivity and specificity of 79% and 75%, respectively. At a cutoff value for the responders of a RI of 78.5%, the ROC analyses showed sensitivity and specificity of 95% and 83%, respectively. CONCLUSION: Our results suggest that (201)Tl-SPECT, as measured by the DR or RI has clinical potential in predicting response of IMRT for patients with recurrent OSCC. The ROC curve analyses further suggest that RI may be superior to DR in distinguishing responders from non-responders.


Assuntos
Carcinoma de Células Escamosas/diagnóstico por imagem , Carcinoma de Células Escamosas/radioterapia , Neoplasias Bucais/diagnóstico por imagem , Neoplasias Bucais/radioterapia , Radioisótopos de Tálio , Tomografia Computadorizada de Emissão de Fóton Único/métodos , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Curva ROC , Recidiva
6.
AJNR Am J Neuroradiol ; 28(6): 1099-101, 2007.
Artigo em Inglês | MEDLINE | ID: mdl-17569967

RESUMO

Diffusion imaging acquired with echo-planar imaging (EPI) is usually performed with parallel imaging to reduce geometric distortions, especially at high fields. This study reports the occurrence of pseudolesions in EPI with parallel imaging. The unfolding artifacts are attributed as arising from a mismatch between RF sensitivity profiles and distorted acquisition data in the presence of susceptibility effects, plus strong signals on the b=0 images. Examples of pseudolesions from the eyeballs are shown, and remedies are suggested.


Assuntos
Algoritmos , Artefatos , Imagem Ecoplanar/métodos , Olho/anatomia & histologia , Aumento da Imagem/métodos , Interpretação de Imagem Assistida por Computador/métodos , Imagem de Difusão por Ressonância Magnética/métodos , Neoplasias Oculares/diagnóstico , Humanos , Reprodutibilidade dos Testes , Sensibilidade e Especificidade
7.
Nuklearmedizin ; 45(5): 201-5, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-17043730

RESUMO

UNLABELLED: The AIM of this prospective study was to evaluate the usefulness of the thallium-201 ( (201) Tl) thyroid scan in the detection of malignancy in cold thyroid nodules whose status was equivocal following palpation fine-needle aspiration cytology (FNAC). PATIENTS, METHODS: Fifty-one patients with clinically palpable solitary cold thyroid nodules classified as non-diagnostic or suspicious following biopsy underwent (201) Tl thyroid scans. Each scan was performed 15 min (early scan) and 3 h (delayed scan) after an intravenous administration of 74 MBq (201) Tl. Thallium uptake in the nodules was visually assessed and scored on a three point scale, with a grade of three defining malignancy. All patients underwent surgery and the histopathology of nodule tissues were compared with results of the scans. RESULTS: Fifty-one nodules were examined. Forty were benign and 11 were malignant. For early scans, the diagnostically relevant parameters were: sensitivity (100%), specificity (75%), and accuracy (80%). Corresponding findings for the delayed scan were: 91%, 98%, and 96%. CONCLUSION: The (201) Tl scan is useful for detecting malignancy in cold thyroid nodules classified as nondiagnostic or suspicious lesions by FNAC.


Assuntos
Radioisótopos de Tálio , Nódulo da Glândula Tireoide/diagnóstico por imagem , Nódulo da Glândula Tireoide/patologia , Biópsia por Agulha Fina , Feminino , Humanos , Masculino , Cintilografia , Reprodutibilidade dos Testes
8.
Eur J Surg Oncol ; 31(10): 1135-40, 2005 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-16289646

RESUMO

AIMS: To assess gastric cancer risk and clinical-pathological factors associated with genetic polymorphisms of MK, IL-4, p16, p21 and p53 genes. METHODS: A retrospective study was conducted for 123 patients who had recently developed primary gastric cancer. Clinical data and pathological findings were collected, genetic polymorphisms of MK, IL-4, p16, p21 and p53 genes were analysed, and the associations of genetic polymorphisms with gastric cancer carcinogenesis were evaluated. RESULTS: There was significant association of genetic polymorphisms between gastric cancer and control groups in p53 genes. After further stratification of the cancer group into different clinical-pathologic parameters, there were significant associations in the sex and LN involvement groups in MK gene; alcohol consumption group in p16 gene; age and cell differentiation groups in p21 gene; age and tumour location groups in p53 gene; but we fail to find any significant association with IL-4 gene polymorphisms. CONCLUSIONS: Genetic susceptibility testing is a tool to evaluate the association of genetic polymorphisms with gastric cancer carcinogenesis.


Assuntos
Inibidor de Quinase Dependente de Ciclina p21/genética , Citocinas/genética , Genes p16 , Genes p53 , Interleucina-4/genética , Neoplasias Gástricas/genética , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Predisposição Genética para Doença , Humanos , Masculino , Pessoa de Meia-Idade , Midkina , Polimorfismo Genético , Taiwan
9.
J Orthop Res ; 23(5): 988-94, 2005 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-16140185

RESUMO

Paclitaxel has been found to exhibit cytotoxic and antitumor activity. There is little information regarding the mechanisms of apoptotic-inducing effect of paclitaxel on human osteogenic sarcoma U-2 OS cells. Several key regulatory proteins are involved in the initiation of apoptosis. Caspase-3 plays a direct role in proteolytic cleavage of cellular proteins responsible for progression to apoptosis. We examined the effect of paclitaxel on the cell cycle arrest and apoptosis in U-2 OS cells using flow cytometric analysis and Western blotting. We also measured the inhibition of paclitaxel-induced apoptosis and the caspase-3 activity by the broad-spectrum caspase inhibitor z-VAD-fmk on U-2 OS cells. The increased levels of casapse-3 were also confirmed by cDNA microarray. Our observations were: (1) paclitaxel treatment resulted in G2/M-cycle arrest in U-2 OS cells; (2) time and dose dependent apoptosis of U-2 OS cells was induced by paclitaxel; (3) in U-2 OS cells, z-VAD-fmk blocked the paclitaxel-induced apoptosis and caspase-3 activation. These results suggest that paclitaxel-induced G2/M-cycle arrest of the G2/M phase and apoptosis via a caspase-3 pathway in U-2 OS cells.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Apoptose/efeitos dos fármacos , Neoplasias Ósseas/tratamento farmacológico , Caspases/fisiologia , Osteossarcoma/tratamento farmacológico , Paclitaxel/farmacologia , Clorometilcetonas de Aminoácidos/farmacologia , Neoplasias Ósseas/patologia , Caspase 3 , Inibidores de Caspase , Ciclo Celular/efeitos dos fármacos , Linhagem Celular Tumoral , Relação Dose-Resposta a Droga , Ativação Enzimática , Humanos , Osteossarcoma/patologia
10.
Phytomedicine ; 12(8): 577-87, 2005 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-16121518

RESUMO

To evaluate the question of whether or not paclitaxel affects the distribution and metabolism of chemical carcinogens such as 2-aminofluorene (AF) on Sprague-Dawley rats were examined. The AF, acetylated AF and AF metabolites were determined and examined by using high performance liquid chromatography. After having received AF only, AF with paclitaxel at the same time and paclitaxel pretreated for 24 h then treated with AF for 24 h, urine, stool and tissues such as liver, kidneys, stomach, colon, bladder and blood were collected and assayed for AF and its metabolites. Compared to the control group, paclitaxel caused an increase of the metabolites excreted in urine and stool. The major metabolite excreted in urine and stool was 9-OH-AAF. The liver is the major metabolism center and the major residual metabolite of AF in the liver was also 9-OH-AAF.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Carcinógenos/farmacocinética , Fluorenos/farmacocinética , Paclitaxel/farmacologia , Fitoterapia , Acetilação , Administração Oral , Animais , Antineoplásicos Fitogênicos/administração & dosagem , Cromatografia Líquida de Alta Pressão , Interações Medicamentosas , Fezes/química , Fluorenos/sangue , Fluorenos/metabolismo , Fluorenos/urina , Fígado/metabolismo , Masculino , Paclitaxel/administração & dosagem , Ratos , Ratos Sprague-Dawley , Distribuição Tecidual
11.
Surg Endosc ; 16(7): 1055-8, 2002 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-12165822

RESUMO

BACKGROUND: Endoscopic thoracic sympathectomy or sympathicotomy of the lower part of the stellate ganglion is an efficient method for the treatment of craniofacial hyperhidrosis, but postoperative compensatory sweating may be troublesome in some patients. Needlescopic thoracic sympathetic block by clipping may achieve a similar effect as well as providing a possible reverse operation for patients who suffer from intolerable postoperative compensatory sweating. METHODS: Between January 1998 and June 2000, we collected a total of 28 patients with craniofacial hyperhidrosis. There were 15 men and 13 women with a mean age of 39.2 years (ranges, 19-50). All patients were placed under single-lumen intubated anesthesia in a semisitting position. Two ports were needed. We used a 2-mm 0 degrees thoracoscope and endo clips to perform a sympathetic block by clipping the lower third of the stellate ganglion at the second intercostal space. RESULTS: The operation was usually accomplished within 20 min (ranges, 15-30). All patients were discharged within 4 h after the operation. There were no surgical complications or surgical mortality cases. All patients achieved improvement of craniofacial hyperhidrosis without recurrent symptoms after a mean of 25.3 months (range, 12-41) of follow-up. Twenty-five patients (85.7%) developed compensatory sweating of the trunk and lower limbs. One of these patients could not tolerate this postoperative sweating; he therefore underwent a reverse operation and obtained improvement of the compensatory sweating 18 days after removal of the endo clips. CONCLUSION: Needlescopic thoracic sympathetic block by clipping is a safe and effective method for the treatment of craniofacial hyperhidrosis; compensatory sweating may be improved after a reverse operation and removal of the endo clips.


Assuntos
Face/patologia , Cabeça/patologia , Hiperidrose/cirurgia , Agulhas , Bloqueio Nervoso/métodos , Simpatectomia/métodos , Nervos Torácicos/cirurgia , Adulto , Procedimentos Cirúrgicos Ambulatórios/métodos , Endoscopia/métodos , Feminino , Seguimentos , Humanos , Hiperidrose/patologia , Tempo de Internação , Masculino , Pessoa de Meia-Idade , Gânglio Estrelado/cirurgia , Sudorese/fisiologia , Fatores de Tempo
12.
Food Chem Toxicol ; 40(5): 705-13, 2002 May.
Artigo em Inglês | MEDLINE | ID: mdl-11955677

RESUMO

N-Acetylation is recognized as the first step in arylamine metabolism. The enzyme responsible for N-acetylation is called arylamine N-acetyltransferase (NAT),which uses acetyl coenzyme A as the acetyl group donor. Paclitaxel has been shown to exhibit antineoplastic and anticancer activity. In this study, paclitaxel was selected to determine the inhibition of arylamine N-acetyltransferase activity, gene expression (NAT mRNA) and DNA-2-aminofluorene adduct formation in human leukemia HL-60 cell line. Paclitaxel (0.01-l microM) did decrease the level of NAT mRNA in a dose-dependent manner. The results demonstrated that paclitaxel inhibited NAT activity and DNA-2-aminofluorene adduct formation in human leukemia HL-60 cells in a dose-dependent manner. Using standard steady-state kinetic analysis, it was demonstrated that paclitaxel was a possible uncompetitive inhibitor to NAT activity in cytosols based on the decrease in apparent values of K(m) and V(max). This report is the first demonstration that paclitaxel affected human leukemia HL-60 cells NAT activity and DNA-2-aminofluorene adduct formation.


Assuntos
Antineoplásicos Fitogênicos/farmacologia , Arilamina N-Acetiltransferase/metabolismo , Carcinógenos/química , Adutos de DNA/efeitos dos fármacos , Fluorenos/química , Regulação Neoplásica da Expressão Gênica/efeitos dos fármacos , Leucemia/enzimologia , Leucemia/genética , Paclitaxel/farmacologia , Acetilação , Animais , Arilamina N-Acetiltransferase/genética , Citosol/enzimologia , Citosol/metabolismo , Depressão Química , Relação Dose-Resposta a Droga , Células HL-60 , Humanos , Cinética , Camundongos , Reação em Cadeia da Polimerase Via Transcriptase Reversa
13.
J Formos Med Assoc ; 100(8): 533-8, 2001 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-11678003

RESUMO

BACKGROUND AND PURPOSE: Risk-taking behavior has been shown to be associated with adolescent pregnancy or childbearing. However, the specific risk-taking behavioral factors and the extent to which they are associated with adolescent childbearing is less clear. The purpose of this study was to determine the risk-taking behavioral factors associated with adolescent childbearing. METHODS: In this case-control study, 198 mothers aged from 16 to 19 years with first-born infants born in Taichung City in 1997 were enrolled. The controls were adolescents with no history of childbearing or pregnancy matched for age and residential neighborhood of each case. A self-administered structured questionnaire inquiring about a variety of risk-taking factors was used to gather relevant information. The logistic regression model was used for univariate, combination of variables, and multivariate analysis. RESULTS: Compared to controls, childbearing adolescents were more likely to have risk-taking behaviors including smoking, drinking, use of illegal substances, working at bars or nightclubs, and lack of use of contraception at first sexual intercourse. Logistic regression analysis for various combinations of risk-taking behaviors revealed that the more items of risk-taking behaviors adolescents had, the higher their risk of childbearing. Multiple logistic regression analysis showed that use of alcohol (adjusted OR = 1.9, 95% CI 1.1-3.1), working at sex-related workplace (adjusted OR = 4.7, 95% CI 2.4-9.3), and no use of contraceptive device at first intercourse (adjusted OR = 3.1, 95% CI 1.3-7.2), were significant risk factors for adolescent childbearing in subjects with previous sexual intercourse. CONCLUSION: Adolescent females who used alcohol, worked at bars or nightclubs or used no contraception at first intercourse were more prone to adolescent childbearing, and a combination of risk-taking behaviors could increase the risk of childbearing. These risk-taking factors should be taken into consideration in the development of prevention programs.


Assuntos
Comportamento do Adolescente , Gravidez na Adolescência/psicologia , Assunção de Riscos , Adolescente , Adulto , Estudos de Casos e Controles , Anticoncepção , Feminino , Humanos , Gravidez , Comportamento Sexual
14.
Oncol Rep ; 8(2): 337-9, 2001.
Artigo em Inglês | MEDLINE | ID: mdl-11182051

RESUMO

The helpfulness of 18F-2-deoxyglucose positron emission tomography (FDG-PET) in restaging non-small cell lung cancer (NSCLC) has not been extensively evaluated. A total of 156 patients referred for restaging of NSCLC were retrospectively evaluated. According to the classification of American Joint Committee on Cancer, stages I and II were defined as conventionally resectable, stage IIIA as locally advanced but resectable, stage IIIB as locally advanced but unresectable, and stage IV as absolutely unresectable. Compared to initial staging by chest computed tomographic findings, FDG-PET down-staged 45/156 (29%) and up-staged 52/156 (33%) NSCLCs. In addition, 37/156 (23%) patients were reclassified from resectable to unresectable and 22/156 (14%) patients were reclassified from unresectable to resectable. Our results prove the helpfulness of whole body FDG-PET for restaging NSCLC.


Assuntos
Carcinoma Pulmonar de Células não Pequenas/diagnóstico por imagem , Carcinoma Pulmonar de Células não Pequenas/patologia , Neoplasias Pulmonares/diagnóstico por imagem , Neoplasias Pulmonares/patologia , Estadiamento de Neoplasias/métodos , Tomografia Computadorizada de Emissão , Biópsia , Carcinoma Pulmonar de Células não Pequenas/cirurgia , Feminino , Fluordesoxiglucose F18 , Humanos , Neoplasias Pulmonares/cirurgia , Metástase Linfática , Masculino , Compostos Radiofarmacêuticos/uso terapêutico , Reprodutibilidade dos Testes , Estudos Retrospectivos , Tomografia Computadorizada por Raios X
15.
Res Commun Mol Pathol Pharmacol ; 109(5-6): 319-31, 2001.
Artigo em Inglês | MEDLINE | ID: mdl-12889515

RESUMO

Genetic regulation of acetyl coenzyme A-dependent N-acetyltransferase (NAT)and O-acetyltransferase (OAT) activities may play an important role in the metabolic activation of arylamine chemicals and carcinogens. N-acetylation is thought to be the first step in arylamine metabolism. The enzyme responsible for N-acetylation is called NAT. In this study, synthetic non-steroidal antiestrogen tamoxifen was selected for determining the inhibition of arylamine NAT activity, gene expression (NAT mRNA) and DNA-2-aminofluorene adduct formation in human leukemia HL-60 cell line. The results demonstrated that tamoxifen did not affect the level of NAT mRNA in HL-60 cells. But the results also showed that NAT activity and 2-Aminofluorene-DNA adduct formation in HL-60 cells were inhibited and decreased by tamoxifen in a dose-dependent manner when the doses of tamoxifen up to 100 micro M. We also examined the standard steady-state kinetic analysis, and the data showed that tamoxifen may be an uncompetitive inhibitor to NAT activity in cytosols based on the decrease apparent values of Km and Vmax. This report is the first finding that tamoxifen inhibited human leukemia HL-60 cells NAT activity and DNA-2-aminofluorene on adduct formation.


Assuntos
2-Acetilaminofluoreno/toxicidade , Arilamina N-Acetiltransferase/metabolismo , Adutos de DNA/genética , Células HL-60/efeitos dos fármacos , Tamoxifeno/toxicidade , Arilamina N-Acetiltransferase/antagonistas & inibidores , Carcinógenos , Relação Dose-Resposta a Droga , Células HL-60/enzimologia , Humanos
16.
Int J Epidemiol ; 29(2): 336-43, 2000 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-10817134

RESUMO

BACKGROUND: The objectives of this study were to assess the accuracy of cause-of-death coding, determine the extent to which coders follow the selection rules of coding set out in the International Classification of Diseases, 9th Revision (ICD-9), and the effects of miscoding on mortality statistics in Taiwan. METHOD: A systematic sample of 5621 death certificates was reviewed. The underlying cause of death (UCD) selected by the reviewer for each death certificate was compared with that selected by the original coder. The UCD was selected according to ACME (Automated Classification of Medical Entities) Decision Tables. RESULTS: The overall agreement rates between the reviewer and coders according to the three-digit and two-digit categories of ICD-9 were 80.9% and 83.9%, respectively. Good agreement was found for malignant neoplasms (kappa = 0.94) and injuries and poisoning (kappa = 0.97), but there was poor agreement for nephrotic diseases (kappa = 0.74), hypertension-related diseases (kappa = 0.74), and cerebral infarction (kappa = 0.77). Reasons for disagreements included disagreement in nomenclature (42.8%), inappropriate judgement of causal relationships (41.5%), and incorrect interpretation of Selection Rule 3 and Modification Rules (15.7%). CONCLUSION: This study showed various levels of agreement for different diseases between the reviewer and the original coders in selection of the UCD. Owing to the 'compensatory effect of errors', the national mortality statistics were not affected significantly. The national administration should undertake routine internal studies to control the quality of UCD coding practices.


Assuntos
Causas de Morte , Atestado de Óbito , Mortalidade , Distribuição por Idade , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Variações Dependentes do Observador , Reprodutibilidade dos Testes , Estudos Retrospectivos , Distribuição por Sexo , Taiwan/epidemiologia
17.
Cancer ; 79(11): 2209-18, 1997 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-9179069

RESUMO

BACKGROUND: Recent studies have indicated an increase in young adulthood Hodgkin's disease incidence, particularly among females, since 1970. However, no studies have examined the long term trends and period-cohort patterns of Hodgkin's disease incidence. METHODS: The current study reported time trends and age-period-cohort patterns of Hodgkin's disease incidence during the period 1935-1992, with an emphasis on incidence rate changes among young adults, using data from the Connecticut Tumor Registry. RESULTS: A total of 4997 incidences of Hodgkin's disease were included in the study. The authors found that the incidence of Hodgkin's disease had increased among young adults age 20-44 years. Incidence had increased dramatically among females since 1970 but less significantly among males. These observed trends were primarily associated with nodular sclerosis histologic type. Age-period-cohort analyses indicated that these observed increases in young adults were cohort phenomena, suggesting possible changes in exposure to risk factors. CONCLUSIONS: Currently identified major risk factors, including social status, Epstein-Barr virus infection, and human immunodeficiency virus infection, cannot adequately explain the observed trends. Analytical epidemiologic studies are urgently needed to identify risk factors that will not only elucidate the etiology of Hodgkin's disease but also explain the rapid increase in Hodgkin's disease incidence among young females.


Assuntos
Doença de Hodgkin/epidemiologia , Adulto , Efeito de Coortes , Connecticut/epidemiologia , Métodos Epidemiológicos , Feminino , Humanos , Incidência , Masculino , Sistema de Registros , Fatores Sexuais
18.
J Reprod Immunol ; 36(1-2): 61-75, 1997 Nov 30.
Artigo em Inglês | MEDLINE | ID: mdl-9430739

RESUMO

Among the numerous monoclonal antibodies generated against human sperm antigens, HS-13 monoclonal antibody was shown to react with an intra-acrosomal antigen from human, mouse and rat. In this study, HS-13 was used as the affinity ligand for the purification of the cognate antigen from human sperm by immunoaffinity chromatography. The purified cognate antigen from human sperm, designated as HSAg-13, was found to be a protein with a molecular weight of approximately 80 kDa on SDS-PAGE in the presence of reducing reagents. This monoclonal antibody was used as the probe to study the tissue distributions and developmental expression of the cognate antigen from human, mouse and rat by immunohistochemical assays. It was concluded that the antigen recognized by HS-13 antibody is highly sperm specific and found only in sperm and mature testis, but not in any other somatic tissues examined in human and mouse. The antigen was shown to be expressed at the postmeiotic stages of spermatogenesis in mouse and rat. By using indirect immunofluorescent staining assay, HS-13 was shown to react only with the methanol-fixed acrosome-intact sperm but not with the live sperm. Following calcium ionophore A23187 treatment, acrosome-reacted sperm showed either negative staining or residual staining in the equatorial region, suggesting the intra-acrosomal location of HSAg-13. The spontaneous acrosome reaction following overnight incubation in BWW medium resulted in a statistically significant decrease of antibody-stained human sperm. In view of excellent correlations for the scoring of acrosome-intact sperm with that of fluorescence-labeled Pisum sativum agglutinin (PSA) probe, HS-13 monoclonal antibody can be routinely used for monitoring sperm capacitation and acrosome reaction.


Assuntos
Acrossomo/imunologia , Anticorpos Monoclonais , Antígenos/química , Acrossomo/fisiologia , Animais , Antígenos/isolamento & purificação , Cromatografia de Afinidade , Humanos , Técnicas Imunoenzimáticas , Masculino , Camundongos , Camundongos Endogâmicos BALB C , Peso Molecular , Ratos , Testículo/crescimento & desenvolvimento , Testículo/imunologia , Distribuição Tecidual
19.
J Trauma ; 41(4): 622-7, 1996 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-8858019

RESUMO

OBJECTIVE: To study the hypothesis that fluid resuscitation alters cytokine gene expression after experimental murine peritonitis. MATERIALS AND METHODS: Mice underwent cecal ligation and puncture (CLP) to induce peritonitis and were randomized to receive variable amounts of normal saline (0, 0.25, 1.0 ml. subcutaneously) and serum (0 or 0.1 mL) after operation. Hepatic and small intestinal (ileal) tissue were harvested at 3 or 6 hours after CLP, and total tissue RNA was extracted. Reverse transcriptase polymerase chain reaction was used to provide relative quantitation of tumor necrosis factor-alpha and interleukin (IL)-1 beta messenger RNA (mRNA) compared with beta-actin. RESULTS: CLP without resuscitation resulted in significant increases in hepatic tumor necrosis factor-alpha mRNA (1190% at 6 hours compared with normal animals), and IL-1 beta mRNA (1475%), and intestinal IL-1 beta mRNA (1243%). Volume administration attenuated cytokine expression at both 3 and 6 hours, and saline seemed to have more potent effects than serum. The volume of resuscitation correlated with survival at 18 hours. Survival in the saline (1 mL) + serum group was 90% at 18 hours compared with 20 to 40% in the groups with little or no resuscitation. Overall, there were no survivors at 30 hours. CONCLUSIONS: Fluid resuscitation (amount, composition, timing) should be an important consideration in the utilization of experimental infection models. Furthermore, optimization of the patient's intravascular volume status during sepsis may have important effects on immune responses, in addition to improving hemodynamic variables.


Assuntos
Citocinas/biossíntese , Hidratação , Peritonite/imunologia , Peritonite/terapia , RNA Mensageiro/biossíntese , Animais , Citocinas/genética , Citocinas/imunologia , Modelos Animais de Doenças , Expressão Gênica , Hemodinâmica , Interleucina-1/biossíntese , Interleucina-1/genética , Interleucina-1/imunologia , Camundongos , Camundongos Endogâmicos , Peritonite/fisiopatologia , Ressuscitação , Fator de Necrose Tumoral alfa/biossíntese , Fator de Necrose Tumoral alfa/genética , Fator de Necrose Tumoral alfa/imunologia
20.
Kaohsiung J Med Sci ; 12(7): 409-16, 1996 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-8753143

RESUMO

Traditionally, maternal and child health services in Taiwan have been offered mainly by the public community health station in each township. There is a trend to integrate these services into the daily practice of physicians in varied medical settings. The purpose of this study was to evaluate the work of providing the maternal and child health services by family physicians practicing at a college hospital. From July 1993 through June 1994, 69 women attending the pre-marital health examination program and 399 family patients who were in need of the maternal and child health services at the Family Medicine Clinic were included in this study. Data related to subjects' backgrounds and office visits were analyzed retrospectively. About 80% of patients attending pre-marital health examinations were satisfied with the scope and process of the services provided. Of 399 family patients contacted by letter and telephone, 322 patients (80.7%) kept the appointments to visit our clinic. Regarding maternal health services, related health education and counselling services were widely provided to female family patients. However, the actual implementation rates of breast examination, Pap smear test and family planning procedures were only 44.5%, 35.7%, and 23.2%, respectively. Factors related to female patients' agreement to do breast examination or Pap smear test included their educational level, age, duration of being enrolled in family care, and the number of family members under the family care. Regarding child health services, vaccinations and periodic health examinations were the main services provided by the family physicians. We concluded that family physicians in our series are capable of providing maternal and child health services to their family patients, and that the actual implementation rates of preventive services could be further promoted through family physicians' more active attitude and recruiting methods.


Assuntos
Serviços de Saúde Materna , Centros de Saúde Materno-Infantil , Adolescente , Adulto , Idoso , Criança , Família , Feminino , Humanos , Pessoa de Meia-Idade , Teste de Papanicolaou , Médicos , Esfregaço Vaginal
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