RESUMEN
La hepcidina es el principal regulador del metabolismo del hierro y el factor patogénico más importante en sus trastornos. La deficiencia de hepcidina provoca sobrecarga de hierro, mientras que su exceso da lugar o contribuye al desarrollo de anemias por déficit o restricción de hierro en las enfermedades crónicas. Conocemos los mecanismos implicados en la síntesis de hepcidina y, en condiciones fisiológicas, hay un equilibrio entre las señales activadoras e inhibidoras que regulan su síntesis. Las primeras incluyen las relacionadas con la concentración plasmática de hierro y con las enfermedades inflamatorias. Las señales inhibidoras más importantes están relacionadas con la eritropoyesis activa y con la matriptasa-2. Conocer cómo se sintetiza la hepcidina ha servido para diseñar nuevos tratamientos farmacológicos cuya diana principal es la hepcidina. En un futuro próximo, se dispondrá de tratamientos eficaces dirigidos a corregir el defecto de muchos de los trastornos del metabolismo del hierro (AU)
Hepcidin is the main regulator of iron metabolism and a pathogenic factor in iron disorders. Hepcidin deficiency causes iron overload, whereas hepcidin excess causes or contributes to the development of iron-restricted anaemia in chronic inflammatory diseases. We know the mechanisms involved in the synthesis of hepcidin and, under physiological conditions, there is a balance between activating signals and inhibitory signals that regulate its synthesis. The former include those related to plasmatic iron level and also those related to chronic inflammatory diseases. The most important inhibitory signals are related to active erythropoiesis and to matriptase-2. Knowing how hepcidin is synthesised has helped design new pharmacological treatments whose main target is the hepcidin. In the near future, there will be effective treatments aimed at correcting the defect of many of these iron metabolism disorders (AU)
Asunto(s)
Humanos , Masculino , Femenino , Hierro/metabolismo , Hierro/uso terapéutico , Hepcidinas/metabolismo , Hepcidinas/farmacología , Hepcidinas/uso terapéutico , Sistemas de Liberación de Medicamentos/métodos , Hepcidinas/agonistas , Hepcidinas/antagonistas & inhibidores , Hepcidinas/deficiencia , Eritropoyesis , Enterocitos , Proteína Morfogenética Ósea 1/uso terapéuticoRESUMEN
Hepcidin is the main regulator of iron metabolism and a pathogenic factor in iron disorders. Hepcidin deficiency causes iron overload, whereas hepcidin excess causes or contributes to the development of iron-restricted anaemia in chronic inflammatory diseases. We know the mechanisms involved in the synthesis of hepcidin and, under physiological conditions, there is a balance between activating signals and inhibitory signals that regulate its synthesis. The former include those related to plasmatic iron level and also those related to chronic inflammatory diseases. The most important inhibitory signals are related to active erythropoiesis and to matriptase-2. Knowing how hepcidin is synthesised has helped design new pharmacological treatments whose main target is the hepcidin. In the near future, there will be effective treatments aimed at correcting the defect of many of these iron metabolism disorders.
Asunto(s)
Hepcidinas/metabolismo , Trastornos del Metabolismo del Hierro/metabolismo , Hierro/metabolismo , Biomarcadores/metabolismo , Proteínas de Transporte de Catión/metabolismo , Homeostasis , Humanos , Trastornos del Metabolismo del Hierro/diagnóstico , Trastornos del Metabolismo del Hierro/etiología , Trastornos del Metabolismo del Hierro/terapiaRESUMEN
No disponible
Asunto(s)
Femenino , Anciano , Humanos , Hidroxiurea/efectos adversos , Trombocitemia Esencial/tratamiento farmacológico , Úlcera Cutánea/inducido químicamente , Anemia de Células Falciformes/tratamiento farmacológicoRESUMEN
The prognosis of follicular lymphomas (FL) is heterogeneous and numerous treatments may be proposed. A validated prognostic index (PI) would help in evaluating and choosing these treatments. Characteristics at diagnosis were collected from 4167 patients with FL diagnosed between 1985 and 1992. Univariate and multivariate analyses were used to propose a PI. This index was then tested on 919 patients. Five adverse prognostic factors were selected: age (> 60 years vs < or = 60 years), Ann Arbor stage (III-IV vs I-II), hemoglobin level (< 120 g/L vs > or = 120 g/L), number of nodal areas (> 4 vs < or = 4), and serum LDH level (above normal vs normal or below). Three risk groups were defined: low risk (0-1 adverse factor, 36% of patients), intermediate risk (2 factors, 37% of patients, hazard ratio [HR] of 2.3), and poor risk (> or = 3 adverse factors, 27% of patients, HR = 4.3). This Follicular Lymphoma International Prognostic Index (FLIPI) appeared more discriminant than the International Prognostic Index proposed for aggressive non-Hodgkin lymphomas. Results were very similar in the confirmation group. The FLIPI may be used for improving treatment choices, comparing clinical trials, and designing studies to evaluate new treatments.