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1.
Hepatología ; 5(2): 137-147, mayo-ago. 2024. fig, tab
Article in Spanish | LILACS, COLNAL | ID: biblio-1556377

ABSTRACT

Introducción. La enfermedad hepática grasa no alcohólica (EHGNA) es la hepatopatía crónica más común en el mundo, y en aproximadamente el 10 % de los casos progresará a cirrosis o a carcinoma hepatocelular. La presencia de fibrosis hepática es el mejor predictor de esta progresión, pero su diagnóstico mediante biopsia hepática es invasivo y con riesgo de complicaciones (alrededor del 2,5 %). Existen puntajes no invasivos que se han desarrollado y validado para estadificar la fibrosis, pero no conocemos su rendimiento en la población colombiana. El objetivo de este estudio fue evaluar el desempeño de los puntajes fibrosis-4 (FIB-4), la relación AST/ALT y el índice AST/plaquetas (APRI) para la detección de fibrosis avanzada en pacientes colombianos con EHGNA. Metodología. Estudio observacional tipo transversal de pacientes con EHGNA, que entre 2008 y 2022 tuvieran disponible el resultado de una biopsia hepática. Se hizo una descripción demográfica básica y se calculó el FIB-4, la relación AST/ALT y el APRI con los laboratorios más recientes previos al procedimiento. Posteriormente se calcularon valores de sensibilidad, especificidad, valores predictivos, razones de verosimilitud y área bajo la curva-característica operativa del receptor (AUC-ROC) para los puntos de corte evaluados previamente en la literatura. Resultados. Se incluyeron 176 pacientes, de los cuales el 14,3 % tenían fibrosis avanzada. El FIB-4 presentó el mejor rendimiento con un valor AUC-ROC de 0,74 para el punto de corte de 1,30 y 2,67. En segundo lugar, estuvo la relación AST/ALT con un valor AUC-ROC de 0,68 con el punto de corte de 0,8, y finalmente el APRI con valor AUC-ROC 0,62 con el punto de corte de 1. Conclusión. En la población analizada los tres puntajes tienen menor rendimiento diagnóstico comparado a los resultados reportados en Europa y Japón. El FIB-4 es el único que alcanza una AUC-ROC con rendimiento razonable, con la limitación que 27,4 % obtuvieron un resultado indeterminado.


Introduction. Non-alcoholic fatty liver disease (NAFLD) is the most prevalent chronic liver disease worldwide, with approximately 10% of cases progressing to cirrhosis or hepatocellular carcinoma. Liver fibrosis presence is the best predictor of this progression, yet its diagnosis through liver biopsy is invasive and poses risk of complications. Although non-invasive scoring systems have been developed and validated for fibrosis staging, their performance remains unexplored in the Colombian population. This study aims to assess the efficacy of the fibrosis-4 (FIB-4) score, AST/ALT ratio, and AST to platelet ratio index (APRI) in detecting advanced fibrosis among Colombian NAFLD patients. Methods. This cross-sectional observational study included NAFLD patients with available liver biopsy results from 2008 to 2022. Basic demographic characteristics were described, and FIB-4, APRI, and AST/ALT ratio were calculated using the latest laboratory data before the procedure. Subsequently, sensitivity, specificity, predictive values, likelihood ratios, and the area under the receiver operating characteristic curve (AUC-ROC) were computed for previously assessed cutoff points. Results. A total of 176 patients were included, among whom 14.3% had advanced fibrosis. FIB-4 demonstrated superior performance with an AUC-ROC value of 0.74 for cutoff points of 1.30 and 2.67. Following was the AST/ALT ratio with an AUC-ROC value of 0.68 for cutoff point of 0.8, and finally, APRI with an AUC-ROC of 0.62 for the cutoff point of 1. Conclusion. All three scores have lower diagnostic efficacy compared to results reported in Europe and Japan. FIB-4 is the only one that achieves an acceptable AUC-ROC performance with the limitation that an indeterminate result was obtained in 27,4% of the sample.

2.
Braz. j. med. biol. res ; 43(5): 425-430, May 2010.
Article in English | LILACS | ID: lil-546330

ABSTRACT

Mesenchymal stem cells (MSC) are multipotential nonhematopoietic progenitor cells capable of differentiating into multiple mesenchymal tissues. MSC are able to reconstitute the functional human hematopoietic microenvironment and promote engraftment of hematopoietic stem cells. MSC constitutively express low levels of major histocompatibility complex-I molecules and do not express costimulatory molecules such as CD80, CD86 or CD40, thus lacking immunogenicity. Furthermore, they are able to suppress T- and B-lymphocyte activation and proliferation and may also affect dendritic cell maturation. Based on these properties, MSC are being used in regenerative medicine and also for the treatment of autoimmune diseases and graft-versus-host disease. On the other hand, MSC from patients diagnosed with myelodysplastic syndromes or multiple myeloma display abnormalities, which could play a role in the physiopathology of the disease. Finally, in patients with immune thrombocytopenic purpura, MSC have a reduced proliferative capacity and a lower inhibitory effect on T-cell proliferation compared with MSC from healthy donors.


Subject(s)
Humans , Mesenchymal Stem Cells , T-Lymphocytes/immunology , Autoimmune Diseases/therapy , Cell Proliferation , Graft vs Host Disease/therapy , Hematopoietic Stem Cell Transplantation , Lymphocyte Activation , Mesenchymal Stem Cells , Multipotent Stem Cells/immunology , T-Lymphocytes/metabolism
3.
Rev. cient. (Maracaibo) ; 16(5): 523-530, oct. 2006. ilus, tab
Article in Spanish | LILACS | ID: lil-630975

ABSTRACT

El efecto del tostado sobre el valor de energía metabolizable verdadera corregida para balance de nitrógeno nulo (EMVn) y el contenido de factores antinutricionales (FAN) de harinas tostadas de Canavalia fue investigado en un ensayo de balance. Adicionalmente, se determinó el contenido de lisina reactiva, la solubilidad de la proteína y el color en las harinas evaluadas. Se asignaron al azar 5 gallos cecotomizados a cada harina (cruda o tostada) a las siguientes temperaturas y tiempos: 180; 200; 220; and 230°C/3 min; 230 y 240°C/2 min; 230 y 240°C/1 min. Cada gallo fue intubado con 40g de harina y las heces fueron recolectadas durante 72 horas. La Concanavalina A (Con A) en las harinas tostadas fue detectada determinando la unión de esta lectina a la mucosa duodenal por inmunohistoquímica. Ninguna de las harinas tostadas mostró actividad hemaglutinante de la Con A, pero se observó unión de esta lectina a la mucosa duodenal con una reacción inmunohistoquímica de moderada a débil. El tostado a 220; 230°C/3 min ó 240°C/2 min redujo la canavanina en más del 90% en relación con la harina cruda. No se observaron diferencias significativas (P < 0,05) entre el valor de EMVn de la harina cruda y el de las harinas tostadas a 200; 220; 230°C/3 min; 240°C/1 ó 240°C/2min mientras que, el tostado a 180°C/3min; 230°C/1min ó 230°C/2min redujo significativamente (P < 0,05) la EMVn. La lisina reactiva y la solubilidad de la proteína fueron reducidas (P < 0,05) al aumentar la temperatura y el tiempo de tostado. El color de las harinas fue también afectado (P < 0,05) por el tostado. En conclusión, el tostado bajo las condiciones evaluadas, puede reducir significativamente el contenido de FAN de la harina cruda de Canavalia. Sin embargo, esta respuesta positiva no incrementó el valor de EMVn de la harina cruda.


The effects of toasting on the True Metabolizable Energy, corrected to zero nitrogen retention (TMEn) and content of antinutritive factors (ANF) present in Jack Beans (JB, Canavalia ensiformis) seeds were investigated in a balance trial. Reactive lysine, protein solubility, and color were also determined in experimental meals. Raw JB meal was toasted at the following combinations of temperature and time: 180; 200; 220 and 230°C/3min; 230 and 240°C/2min; and 230 and 240°C/1min. Five caecectomised cockerels were randomly assigned to each JB meal (raw or toasted). Each bird was intubated 40g of a given meal and excreta were quantitatively collected during 72h. Concanavalin A binding to duodenal mucosa was assessed by immunohistochemistry. No hemaglutinating activity was detected in toasted JB but Con A binding to duodenal mucosa ranged from moderate to weak. Toasting JB meal at 220; 230°C/3min; and 240°C/2min reduced the original canavanine content of JB in more than 90%. TMEn value of raw JB was not improved by toasting. No significant differences were found between TMEn of raw JB and those of JB toasted at 200; 220; 230°C/3min; 240°C/1min or 240°C/2min, whereas toasting JB meal at 180°C/3min; 230°C/1min or 230°C/2min significantly (P < 0.05) reduced TMEn. Reactive lysine and protein solubility were reduced (P < 0.05) as both temperature and toasting time increased. Meal color was also affected (P < 0.05) by toasting. In summary, under the conditions tested, toasting can effectively reduce ANF content in raw JB. However, this positive response did not improve the TMEn value of raw JB.

4.
JBC j. bras. clin. odontol. integr ; 10(53): 149-154, abr.-jun. 2006. tab, graf, ilus
Article in Portuguese | LILACS, BBO | ID: lil-518328

ABSTRACT

O propósito deste estudo foi avaliar a resistência ao cisalhamento dos sistemas adesivos Single Bond (3M ESPE) e Bond 1 (Jeneric/Pentron) após a aplicação na dentina do agente dessensibilizante Gluma Desensitizer (Kulzer). Foram utilizados 20 terceiros molares humanos hígidos, extraídos por motivos terapêuticos, os quais foram armazenados em soro fisiológico. Os dentes foram lixados com lixa d'água de granulação #100, #320, #600, respectivamente, para obter uma superfície plana e lisa. A área de adesão foi delimitada com um círculo de papel adesivo (contacto), contendo uma perfuração central de 2,34 mm de diâmetro. Grupo 1: Controle (Bond 1); Grupo 2: (Gluma + Bond 1) aplicação do Gluma por 60 s, secar por 30s, lavar por 10s, secar por 5s; Grupo 3: Controle (Single Bond); Grupo 4: (Gluma + Single Bond) aplicação do Gluma por 60s, secar por 30s, lavar por 10s, secar por 5s. A resina Filtek Z250 (3M ESPE) cor B2 foi aplicada com o auxílio de uma espátula de teflon sobre a superfície dentinária. Os corpos de prova foram armazenados em água destilada a 37ºC por 24 h. A resistência ao cisalhamento foi determinada na máquina KRATOS 2000 a uma velocidade de 0,5 mm/min. Os resultados em MPa foram (média +- D. P.): Grupo 1 (14,47 +- 5,02); Grupo 2 (15,60 +- 2,74); Grupo 3 (16,74 +- 4,06); Grupo 4 (14,90 +- 3,78). Os dados foram analisados pelo teste ANOVA. A análise estatística demonstrou não haver diferença estatística entre os grupos. Conclui-se que o agente dessensibilizante Gluma Desensitizer não influenciou significativamente na força de adesão dos sistemas adesivos.


Subject(s)
Dentin Sensitivity , Dentin-Bonding Agents , Shear Strength , Analysis of Variance , Dentition, Permanent , Hypersensitivity
5.
Rev. serv. sanid. fuerzas polic ; 48(2): 173-6, jul.-dic. 1987.
Article in Spanish | LILACS, LIPECS | ID: lil-83113
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