| خلاصه مقاله | is growing support for the concept of reactive oxygen species, which are known to be
implicated in the range of diseases, may be important progenitors in carcinogenesis,
including colorectal cancer (CRC). CRC is one of the most common cancers worldwide, with
the highest incidence rates in western countries. In the last decades, association between
oxidative stress and CRC has been intensively studied. Astaxanthin (ATX) is a gold
carotenoid showing efficient scavenging ability and is considered as a candidate in new
therapies for preventing and treating cellular oxidative stress. That the first defensive cell
barrier against oxidative stress and ROS is nuclear factor erythroid 2-related factor
2(Nrf2), a basic leucine zipper (bZIP) transcription factor. It can express cytoprotective
genes, such as antioxidant proteins, phase I, II and detoxification proteins. This study was
designed to evaluate the protective effects of encapsulated ATX in chitosan-alginate (CSALG)
microbeads on HT29 cells against oxidative stress and the possible underlying
mechanism. To this end, ATX encapsulated CS-ALG microbeads were prepared by the
spraying of CS-ALG/ATX mixture solution into the CaCl2 solution. The structural
properties, size distribution, and surface morphology were investigated using FT-IR, XRD
and scanning electron microscopy. The biocompatibility of CS-ALG microbeads was
examined in vitro via MTT assay. Cytotoxicity study revealed that the prepared microbeads
are cytocompatible and indicate no significant toxicity on HT29 cells. The apoptosis rate
was measured with DNA ladder method, and flow cytometry. Nrf2 expression was
examined with Real-time PCR. |