Spirulina maxima extract prevents cell death through BDNF activation against amyloid beta 1-42 (Aβ1-42) induced neurotoxicity in PC12 cells

Abstract

Spirulina maxima is a blue-green micro alga that contains abundant amounts of proteins (60-70%), vitamins, chlorophyll a, and C-phycocyanin (C-PC). It has been shown to reduce oxidative stress, and prevent diabetes and non-alcoholic fatty liver disease. However, it is unclear whether Spirulina maxima 70% ethanol extract (SM70EE), chlorophyll a, and C-PC prevent Aβ_1-42-induced neurotoxicity in PC12 cells. The aim of this study was to investigate whether SM70EE, chlorophyll a, and C-PC prevent Aβ_1-42-induced cell death. SM70EE, chlorophyll a, and C-PC suppressed the Aβ_1-42-induced increase in poly-ADP ribose polymerase-1 (PARP-1) cleavage and reduced Aβ_1-42-induced decreases in glutathione and its associated factors. The level of brain-derived neurotrophic factor (BDNF), which plays a critical role in neuronal survival and neuroprotection, was increased by SM70EE, chlorophyll a, and C-PC in Aβ_1-42-treated cells. SM70EE treatment decreased oxidative stress and cell death in response to Aβ_1-42 treatment, while simultaneously suppressing PARP cleavage and increasing the levels of glutathione (GSH) and its associated factors. Moreover, SM70EE lowered the levels of APP and BACE1, two major factors involved in APP processing, and increased BDNF expression during Aβ_1-42-induced neurotoxicity in PC12 cells. We suggest that SM70EE prevents cell death caused by Aβ_1-42 -induced neurotoxicity via the activation of BDNF signaling.

Keywords: Amyloid precursor protein (APP) processing; Brain-derived neurotrophic factor (BDNF); Cell death; Oxidative stress; Spirulina maxima 70% ethanol extract (SM70EE).