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The intracellular monoamine oxidase-A inhibitory activity and the protective effect of small hairtail-related peptides in nerve cells (SH-SY5Y).
Bioscience, Biotechnology, and Biochemistry 2023 December 9
This study was to investigate the inhibitory activity of small hairtail-related peptides (VFEVFW, LPNSLYQQ, LPNSLYQK and FADAME) on intracellular monoamine oxidase-A (MAO-A) and their protective effects in a cell model. Specifically, the inhibition activity in SH-SY5Y cells indicated that VFEVFW and LPNSLYQK reduced about 50% of MAO-A activity in cells, at 0.5 mM. The survival experiment demonstrated that the toxic effect of dexamethasone (DEX) on cells can be significantly alleviated in the presence of peptides, and these peptides can restore (>20%) the mitochondrial membrane potential of SH-SY5Y cells reduced by DEX. Circular dichroism displayed that peptides affected the secondary structure of MAO-A in a concentration-dependent manner. Finally, RT-qPCR assay revealed that the MAO-A inhibitory activity of the peptides was associated with the up-regulation of BDNF/CREB/Bcl-2 mRNA levels.
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