GSPE pre-treatment protects against long-term cafeteria diet-induced mitochondrial and inflammatory affectations in the hippocampus of rats

Deregulations like the loss of sensitivity to insulin (insulin resistance) and chronic inflammation are alterations very commonly found in sporadic forms of neurodegenerative pathologies. Thus, finding strategies to protect against them, may lead to a reduction in the incidence and/or affectation of these pathologies. The grape seed-derived proanthocyanidins extract (GSPE) is a mixture of compounds highly enriched in polyphenols and flavonoids that have shown to have a wide range of therapeutic benefits due to their antioxidant and anti-inflammatory properties. Objectives This study aimed to assess the protective effects of a short pre-treatment of GSPE in the hippocampus against a prolonged feeding with cafeteria diet. Methods GSPE was administered for 10 days followed by 12 weeks of cafeteria diet. We analyzed transcriptional activity of genes and protein expression of key mediators of neurodegeneration in brain samples. Results Results indicated that GSPE was able to protect against cellular damage through the activation of AKT, as well as promote the maintenance of mitochondrial function by conserving the OXPHOS complexes and upregulating the antioxidant SOD. Discussion We observed that GSPE decreased inflammatory activation as observed through the downregulation of JNK, IL6 and TNF alpha, just like the reduction in reactive profile of astrocytes. Overall, the data presented here offers an interesting and hopeful initial step for future long-term studies on the beneficial effects of a supplementation of common diets with polyphenol and flavonoid substances for the amelioration of typical early hallmarks of neurodegeneration.

Automated summary

The study aimed to evaluate the protective effects of short-term GSPE pre-treatment in the hippocampus of rats against prolonged feeding with cafeteria diet. Results showed that GSPE was able to protect against cellular damage through AKT activation and promote mitochondrial function maintenance. Additionally, GSPE decreased inflammatory activation and reduced reactivity of astrocytes.