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1.
Cell Rep ; 39(4): 110730, 2022 04 26.
Artigo em Inglês | MEDLINE | ID: mdl-35476977

RESUMO

Mammals have limited regenerative capacity, whereas some vertebrates, like fish and salamanders, are able to regenerate their organs efficiently. The regeneration in these species depends on cell dedifferentiation followed by proliferation. We generate a mouse model that enables the inducible expression of the four Yamanaka factors (Oct-3/4, Sox2, Klf4, and c-Myc, or 4F) specifically in hepatocytes. Transient in vivo 4F expression induces partial reprogramming of adult hepatocytes to a progenitor state and concomitantly increases cell proliferation. This is indicated by reduced expression of differentiated hepatic-lineage markers, an increase in markers of proliferation and chromatin modifiers, global changes in DNA accessibility, and an acquisition of liver stem and progenitor cell markers. Functionally, short-term expression of 4F enhances liver regenerative capacity through topoisomerase2-mediated partial reprogramming. Our results reveal that liver-specific 4F expression in vivo induces cellular plasticity and counteracts liver failure, suggesting that partial reprogramming may represent an avenue for enhancing tissue regeneration.


Assuntos
Reprogramação Celular , Fígado , Animais , Desdiferenciação Celular , Hepatócitos/metabolismo , Fígado/metabolismo , Regeneração Hepática , Mamíferos , Camundongos
2.
Nat Commun ; 12(1): 3094, 2021 05 25.
Artigo em Inglês | MEDLINE | ID: mdl-34035273

RESUMO

Short-term, systemic expression of the Yamanaka reprogramming factors (Oct-3/4, Sox2, Klf4 and c-Myc [OSKM]) has been shown to rejuvenate aging cells and promote tissue regeneration in vivo. However, the mechanisms by which OSKM promotes tissue regeneration are unknown. In this work, we focus on a specific tissue and demonstrate that local expression of OSKM, specifically in myofibers, induces the activation of muscle stem cells or satellite cells (SCs), which accelerates muscle regeneration in young mice. In contrast, expressing OSKM directly in SCs does not improve muscle regeneration. Mechanistically, expressing OSKM in myofibers regulates the expression of genes important for the SC microenvironment, including upregulation of p21, which in turn downregulates Wnt4. This is critical because Wnt4 is secreted by myofibers to maintain SC quiescence. Thus, short-term induction of the Yamanaka factors in myofibers may promote tissue regeneration by modifying the stem cell niche.


Assuntos
Diferenciação Celular/genética , Reprogramação Celular/genética , Miofibrilas/metabolismo , Regeneração/genética , Células Satélites de Músculo Esquelético/metabolismo , Nicho de Células-Tronco , Animais , Células Cultivadas , Feminino , Expressão Gênica , Fator 4 Semelhante a Kruppel , Fatores de Transcrição Kruppel-Like/genética , Camundongos Transgênicos , Miofibrilas/fisiologia , Fator 3 de Transcrição de Octâmero/genética , Proteínas Proto-Oncogênicas c-myc/genética , Fatores de Transcrição SOXB1/genética , Células Satélites de Músculo Esquelético/citologia , Proteína Wnt4/genética
4.
Nutr Hosp ; 34(5): 1163-1169, 2017 Oct 24.
Artigo em Espanhol | MEDLINE | ID: mdl-29130716

RESUMO

INTRODUCTION: Quinoa is a pseudocereal containing low glycemic index carbohydrates, dietary fiber, high biological value protein, phytosterols, and n-3 and n-6 fatty acids, which has generated interest in prediabetes nutritional interventions. This randomized (2:1), placebo-controlled, double-blind study evaluated the effects of processed quinoa on body mass index (BMI), glycated hemoglobin (HbA1c), fasting plasma glucose (FPG) and the satiation and fullness (complete) degree in prediabetic patients. MATERIAL AND METHOD: Thirty patients were randomized (2:1) in two study arms: Kuska Active product (processed quinoa) and placebo (maltodextrin), with an intake period of 28 days. BMI, HbA1c and FPG were determined before starting treatment and at 28-day intake. Satiety and fullness sensation were just assessed by visual analog scale (VAS) at the day 28. ANOVA was performed for repeated measures with two factors to study (within-subject factor: time; intersubject factor: product consumed) to demonstrate the effectiveness of processed quinoa on the study variables. RESULTS: Twenty-nine patients (placebo, n = 10; quinoa, n = 19) completed the study, and the quinoa group shows a significant decrease in BMI (p < 0.05) and HbA1c values (p < 0.001), and an increase in the satiation and fullness (complete) degree (p < 0.001). No significant differences were found in FPG levels from baseline to post-intake period. CONCLUSIONS: The results show that processed quinoa intake during 28 days decreases BMI and HbA1c levels, maintains FPG levels, and incr eases the satiation and fullness (complete) degree in prediabetic patients.


Assuntos
Chenopodium quinoa , Terapia Nutricional/métodos , Estado Pré-Diabético/dietoterapia , Adulto , Idoso , Índice de Massa Corporal , Método Duplo-Cego , Feminino , Hemoglobinas Glicadas/análise , Humanos , Masculino , Pessoa de Meia-Idade , Estado Pré-Diabético/sangue , Resposta de Saciedade
5.
Nutr. hosp ; 34(5): 1163-1169, sept.-oct. 2017. tab, graf
Artigo em Espanhol | IBECS | ID: ibc-167578

RESUMO

Introducción: la quinua es un pseudocereal que contiene hidratos de carbono de bajo índice glucémico, fibra alimentaria, proteínas de alto valor biológico, fitoesteroles y ácidos grasos n-3 y n-6, y que ha suscitado interés en la intervención nutricional de la prediabetes. Este estudio aleatorizado (2:1), controlado con placebo y doble ciego, evaluó los efectos de la quinua sobre el índice de masa corporal (IMC), hemoglobina glicada (HbA1c), glucemia basal (GB) y el grado de saciedad y plenitud en pacientes prediabéticos. Material y método: se aleatorizaron (2:1) 30 pacientes en dos ramas a estudio: el producto Kuska Active (quinua procesada) y placebo (maltodextrina). El periodo de ingesta fue de 28 días. Antes de iniciar el tratamiento y a los 28 días se determinó el IMC, HbA1c y la GB. La sensación de saciedad y plenitud se evaluó mediante escala visual analógica (EVA). Para demostrar la eficacia de la quinua procesada Kuska Active sobre las variables a estudio se realizó ANOVA para medidas repetidas con dos factores a estudio (factor intrasujeto: tiempo y factor intersujeto: producto consumido). Resultados: finalizaron el estudio un total de 29 pacientes (placebo, n = 10; quinua, n = 19). Se detectó en el grupo quinua procesada una disminución significativa en los valores de IMC (p < 0,05) y HbA1c (p < 0,001) y un aumento en la sensación de saciedad y plenitud (p < 0,001). No se encontraron diferencias significativas en los niveles de GB desde el momento basal hasta el periodo postingesta. Conclusiones: los resultados muestran que la quinua procesada disminuye el IMC y los niveles de HbA1c, mantiene los niveles de GB y aumenta la sensación de saciedad y plenitud en pacientes prediabéticos (AU)


Introduction: Quinoa is a pseudocereal containing low glycemic index carbohydrates, dietary fiber, high biological value protein, phytosterols, and n-3 and n-6 fatty acids, which has generated interest in prediabetes nutritional interventions. This randomized (2:1), placebo-controlled, double-blind study evaluated the effects of processed quinoa on body mass index (BMI), glycated hemoglobin (HbA1c), fasting plasma glucose (FPG) and the satiation and fullness (complete) degree in prediabetic patients. Material and method: Thirty patients were randomized (2:1) in two study arms: Kuska Active product (processed quinoa) and placebo (maltodextrin), with an intake period of 28 days. BMI, HbA1c and FPG were determined before starting treatment and at 28-day intake. Satiety and fullness sensation were just assessed by visual analog scale (VAS) at the day 28. ANOVA was performed for repeated measures with two factors to study (within-subject factor: time; intersubject factor: product consumed) to demonstrate the effectiveness of processed quinoa on the study variables. Results: Twenty-nine patients (placebo, n = 10; quinoa, n = 19) completed the study, and the quinoa group shows a significant decrease in BMI (p < 0.05) and HbA1c values (p < 0.001), and an increase in the satiation and fullness (complete) degree (p < 0.001). No significant differences were found in FPG levels from baseline to post-intake period. Conclusions: The results show that processed quinoa intake during 28 days decreases BMI and HbA1c levels, maintains FPG levels, and increases the satiation and fullness (complete) degree in prediabetic patients (AU)


Assuntos
Humanos , Adulto , Pessoa de Meia-Idade , Idoso , Estado Pré-Diabético/dietoterapia , Chenopodium quinoa , Diabetes Mellitus Tipo 2/dietoterapia , Avaliação Nutricional , Saciação/fisiologia , Índice de Massa Corporal , Análise de Variância , Programas Voluntários , Antropometria/instrumentação , 28599
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