Most of the biological impacts of Vitamin E, including the redox effects, have been raised from studies with α-tocopherol only, despite the fact that tocopherol-containing foods carry mixed tocopherol isomers. Here, we investigated the cellular mechanisms involved in the immediate antioxidant responses evoked by α-, γand δ-tocopherol in Caco-2 cells. In order to track the cytosolic redox impact, we performed imaging on cells expressing HyPer, a fluorescent redox biosensor, while cytosolic calcium fluctuations were monitored by means of Fura-2 dye and imaging. With this approach, we could observe fast cellular responses evoked by the addition of α-, γand δ-tocopherol at concentrations as low as 2.5 µM. Each isomer induced rapid and consistent increases in cytosolic calcium with fast kinetics, which were affected by chelation of extracellular Ca 2+ , suggesting that tocopherols promoted a calcium entry upon the contact with the plasma membrane. In terms of redox effects, δ-tocopherol was the only isomer that evoked a significant change in the HyPer signal at 5 µM. By mimicking Ca 2+ entry with ionomycin and monensin, a decline in the HyPer signal was induced as well. Finally, by silencing calcium with 1,2-bis(o-aminophenoxy)ethane-N,N,N ,N -tetraacetic acid (BAPTA), an intracellular Ca 2+ chelator, none of the isomers were able to induce redox changes. Altogether, our data indicate that an elevation in cytoplasmic Ca 2+ is necessary for the development of a tocopherol-induced antioxidant impact on the cytoplasm of Caco-2 cells reported by HyPer biosensor.
Las legumbres han sido históricamente consideradas una apetecible fuente de proteínas y fibra. En estos tiempos caracterizados por una tendencia epidemiológica al sobrepeso y a la obesidad, corregir hábitos poco saludables es prioritario. La incorporación de legumbres al menú cotidiano como sustituto de carnes podría significar, a mediano y largo plazo, aminorar la prevalencia de enfermedades crónicas no-transmisibles. Este trabajo ofrece una mirada actualizada de algunos constituyentes claves presentes en las semillas de legumbres frecuentemente consumidas por la población chilena: porotos (Phaseolus vulgaris L.), lentejas (Lens culinaris L.); garbanzos (Cicer arietinum L.) y arvejas (Pisum sativum L.). Con una perspectiva realista, se expone el efecto del remojo y la cocción, ambos procesos simples utilizados frecuentemente en su preparación. Además, se ha considerado la digestión y fermentación como procesos claves en la liberación de compuestos bioactivos y su interacción con la microbiota residente en la porción distal del tracto gastrointestinal. Finalmente, estudios epidemiológicos en conjunto con datos experimentales permiten obtener una idea de los mecanismos que subyacen al impacto nutricional que tiene el consumo habitual de legumbres.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.