RESUMO
Objective: To produce fluorescent tagged recombinant erythroferrone protein (ERFE_eGFP) for laboratory investigations. Methods: Erythroferrone (ERFE) gene was fused to green fluorescent protein (eGFP) gene and cloned in a pSecTag2Hygro plasmid. The constructed plasmid was amplified in Escherichia coli DH5α and the eGFP-fused ERFE (ERFE_eGFP) protein was expressed in human embryonic kidney (HEK293T) cell line. Results: The plasmid constructed from colony C6 contained ERFE_eGFP with the correct restriction sizes of 4.2 kb and expressed secretory ERFE_eGFP fusion protein (approximately size of 75 kDa) in HEK293T cell line. Conclusions: ERFE_eGFP recombinant protein is successfully expressed as a secretory functional protein and could be sensitively detected using fluorometry. This fusion protein might benefit future applications for localization of cellular ERFE receptors and competitive immunoassay of ERFE concentration.
RESUMO
Objective: To produce fluorescent tagged recombinant erythroferrone protein (ERFE-eGFP) for laboratory investigations. Methods: Erythroferrone (ERFE) gene was fused to green fluorescent protein (eGFP) gene and cloned in a pSecTag2Hygro plasmid. The constructed plasmid was amplified in Escherichia coli DH5 α and the eGFP-fused ERFE (ERFE-eGFP) protein was expressed in human embryonic kidney (HEK293T) cell line. Results: The plasmid constructed from colony C6 contained ERFE-eGFP with the correct restriction sizes of 4.2 kb and expressed secretory ERFE-eGFP fusion protein (approximately size of 75 kDa) in HEK293T cell line. Conclusions: ERFE-eGFP recombinant protein is successfully expressed as a secretory functional protein and could be sensitively detected using fluorometry. This fusion protein might benefit future applications for localization of cellular ERFE receptors and competitive immunoassay of ERFE concentration.
RESUMO
En las últimas décadas se ha avanzado en el conocimiento de la regulación del metabolismo del Hierro (Fe). La Hepcidina (Hp), producida por los hepatocitos, regula la absorción de hierro desde el tubo digestivo y la liberación desde los depósitos del sistema macrofágico y del hígado. En caso de deficiencia de Fe, la Hp está disminuida entregando Fe a la transferrina (Tf). El aumento de Fe y de las citoquinas de la inflamación estimulan la producción de Hp. El ejecutor de la Hp es la Ferroportina (FP), único exportador de Fe. Hay reguladores naturales de la Hp, como la Matriptasa 2. Las mutaciones que limitan su expresión inducen dificultades en la disponibilidad de Fe (IRIDA, sobrecarga de Fe). En los últimos años se ha identificado la Eritroferrona, producida por los eritroblastos activos en la eritropoyesis. Inhibe la síntesis de Hp, permitiendo la liberación del hierro de los depósitos y su absorción por el tubo digestivo, para facilitar la disponibilidad de Fe para la eritropoyesis. Aún no está definido cómo se podrán utilizar estos elementos en el campo diagnóstico, su estandarización y su aplicación terapéutica, pero es probable que resulten de gran utilidad.
In the last decades, a lot of progress has been made on the knowledge of iron (Fe) metabolism regulation. Hepcidin (Hp) is produced by hepatocytes and it regulates the iron absorption from the duodenum and the liberation from macrophages and from the liver. When there is iron deficiency, Hp, which delivers iron to transferrin (Tf), is low. Iron overload and inflammation cytokines stimulate Hp production. The Hp natural executor is Ferroportin (FP), which is the only iron exporter from the cells. One of the natural regulators of Hp is Matriptasa 2, which down regulates Hp. Mutations that limit their expression induce iron overload and anemia (IRIDA). In the last few years, Erythroferrone (ERFE) was discovered. ERFE is produced by active erythroblasts: it inhibits Hp synthesis, allowing the iron liberation from deposits and its duodenal absorption, and also the iron release from macrophages facilitating the erythroid production. The erythroblastic activity, even ineffective, acts as a stimulus of ERFE synthesis. Until now, it has not been defined yethow these different variables could be used for diagnosis, its standardization, or for therapeutic applications, but it is highly probable that they will improve our knowledge and managements kills in this field.
Nas últimas décadas háavanços no conhecimento da regulação do metabolismo do Ferro (Fe). A Hepcidina (Hp), produzida pelos hepatócitos, regula a absorção do ferro desde o tubo digestivo e a liberação desde os depósitos do sistema macrofágico e do fígado. Em caso de deficiência de Fe, a Hp está diminuída entregando Fe à transferrina (Tf). O aumento de Fe e as citoquinas da inflamação estimulam a produção de Hp. O executor da Hp é a Ferroportina (Fp), único exportador de Fe. Há reguladores naturais da Hp, como a Matriptase 2. As mutações que limitam sua expressão induzem dificultades na disponibilidade de Fe (IRIDA, sobrecarga de Fe). Nos últimos anos se identificou que a Eritroferrona, produzida pelos eritroblastosativos na eritropoiese inibe a síntese de Hp, permitindo a liberação de ferro dos depósitos e a absorção pelo tubo digestivo, para facilitar a disponibilidade de Fe para a eritropoiese. Ain da não sedefiniu como poderãoser utilizadosestes elementos no campo diagnóstico, sua padronização e sua aplicação terapêutica, mas é provável que sejam de grande utilidade.