Effect of an intracerebroventricular injection of aggregated beta-amyloid (1-42) on daily rhythms of oxidative stress parameters in the prefrontal cortex

LEDESMA CARINA; CORIA-LUCERO, CINTHIA D.; DELSOUC BELEN; CASAIS, MARILINA; DELLA VEDOBA CECILIA; RAMIREZ DARIO; DEVIA CRISTINA; DELGADO, SILVIA M.; NAVIGATORE FONZO LORENA; ANZULOVICH, AC

NEUROSCIENCE

PERGAMON-ELSEVIER SCIENCE LTD

Lugar: Amsterdam; Año: 2020

0306-4522

Accumulation of amyloid peptides in the brain plays a key role in the pathogenesis of Alzheimer?s disease (AD). Aggregated beta-amyloid (Ab) peptide increases intracellular reactive oxygen species associated to adeficient antioxidant defense system. Prefrontal cortex plays a key role in memory and learning and is especiallysusceptible to oxidative stress. The objective of this work was to investigate the effects of an intracerebroventricular (i.c.v.) injection of Ab (1?42) on 24 h patterns of oxidative stress parameters and antioxidant defenses in the rat prefrontal cortex. Four-month-old male Holtzman rats were divided into two groups defined as: control (CO) and Ab-injected (Ab). Rats were maintained under12 h-light:12 h-dark conditions and received water and food ad libitum. Tissues samples were isolated every 6 h during a 24 h period. Interestingly, we found that an i.c.v. injection of Ab(1?42) increased lipid peroxidation, reduced total antioxidant capacity level, phase-shifted the daily peak of reduced glutathione, and had a differential effect on the oscillating catalase and glutathione peroxidase specific activity. Thus, elevated levels of Ab aggregates-a pathogenic hallmark of AD, caused altered temporal patterns of the cellular redox state in prefrontal cortex rat. These findings might contribute, at least in part, to the understanding of the molecular and biochemical basis of redox changes caused by circadian rhythms alterations observed in AD patients