Elucidating the Molecular Mechanism by Which Gallic Acid Alleviates Oxidative Stress and Inflammatory Response of Acrylamide-Induced Renal Injury in a Rat Model

Abstract

This study investigates the molecular effects of Acrylamide (ACR)-induced kidney damage and the potential protective role of Gallic acid (GA). Forty male rats were divided into five groups: Control, ACR, ACR+GA50, ACR+GA100, and GA100. The ACR groups received a daily oral dose of 50 mg/kg, while GA groups received 50 or 100 mg/kg oral doses for 14 consecutive days. On the 15th day, the animals were euthanized, and kidney samples were collected. The MDA, GSH, SOD, GPx, and CAT oxidative stress parameters were measured. The renal inflammatory response was evaluated by measuring the level of TNF-α, IL-1β, IL-6, NF-κB, COX-2, and IL-10. The downstream pro-apoptotic signaling pathway was resolved by measuring the levels of p38 MAPK and p53. The ACR induced renal oxidative stress with aggravated lipid peroxidation as revealed by the reduction in the levels GSH, SOD, GPx, and CAT of antioxidants while over-increase in the level of MDA, respectively. The levels of IL-1β, IL-6, NF-kB, COX-2 pro-inflammatory mediators as well as the p38 MAPK and p53 pro-apoptotic intermediates were further elevated. This increase in inflammatory response was met with marked decrease in anti-inflammatory IL-10 level. However, GA treatments- in dose dependent manner- had been demonstrated to effectively mitigate oxidative stress and reduce inflammatory responses, while also enhancing the cellular anti-inflammatory defense mechanisms. The GA can be considered as a novel protective antioxidant, anti-apoptotic drug against ACR-induced nephrotoxic insult. Further study should be performed to estimate the exact effective dose.