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Polystyrene nanoplastics (PS-NPs) are ubiquitous environmental pollutants that can cause oxidative stress in various organs, including the liver. Didymin is a dietary flavanone that displays multiple pharmacological activities. Therefore, the present study evaluated the palliative role of didymin against PS-NPs-induced hepatic damage in rats. Albino rats (n=48) were randomly distributed into 4 groups: control, PS-NPs treated group, PS-NPs + didymin co-administered group, and didymin supplemented group. After 30 days, PS-NPs intoxication lowered the expression of Nrf-2 and anti-oxidant genes [catalase (CAT), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione reductase (GSR), glutathione-S-transferase (GST), and heme oxygenase-1 (HO-1)], whereas the expression of KEAP1 kelch like ECH associated protein 1 (Keap-1) was increased. PS-NPs exposure also reduced the activities of anti-oxidants enzymes (CAT, SOD, GPx, GSR, GST, GSH, and OH-1), while malondialdehyde (MDA) and reactive oxygen species (ROS) levels were increased. The levels of alanine transaminase (ALT), aspartate aminotransferase (AST), and alkaline phosphatase (ALP) were increased in PS-NPs-exposed rats. Moreover, inflammatory indices [interleukin-1β (IL-1β), tumor necrosis factor alpha (TNF-α), interleukin-6 (IL-6), nuclear factor-kappa B (NF-κB), and cyclooxygenase-2 (COX-2)] were increased in PS-NPs-exposed rats. Furthermore, PS-NPs intoxication increased the expressions of apoptotic markers including Bax and Caspase-3, as well as reducing Bcl-2 expression. The histopathological analysis showed significant damage in PS-NPs-treated rats. However, didymin supplementation ameliorated all the PS-NPs-induced damage in the liver of rats. Therefore, it was concluded that didymin can act as a remedy against PS-NPs-induced liver toxicity due to its anti-apoptotic, anti-oxidant, and anti-inflammatory activities. PSNPs PS NPs (PS-NPs organs Therefore PSNPsinduced induced n=48 n48 n 48 (n=48 groups control group coadministered co administered 3 days Nrf2 Nrf 2 Nrf- antioxidant anti oxidant catalase CAT, CAT , (CAT) SOD (SOD) GPx (GPx) GSR (GSR) glutathioneStransferase S transferase GST (GST) oxygenase1 oxygenase oxygenase- HO1, HO1 HO (HO-1)] KEAP Keap1 Keap (Keap-1 antioxidants oxidants (CAT GSH OH1, OH1 OH OH-1) MDA (MDA ROS (ROS ALT, ALT (ALT) AST, AST (AST) ALP (ALP PSNPsexposed exposed Moreover interleukin1β interleukinβ interleukin 1β β IL1β, IL1β ILβ IL (IL-1β) TNFα, TNFα TNF α (TNF-α) interleukin6 6 interleukin- IL6, IL6 (IL-6) factorkappa kappa NFκB, NFκB NF κB (NF-κB) cyclooxygenase2 cyclooxygenase cyclooxygenase- COX2 COX (COX-2) Furthermore Caspase3, Caspase3 Caspase 3, Caspase-3 Bcl2 Bcl Bcl- PSNPstreated However antiapoptotic, antiapoptotic apoptotic, anti-apoptotic antioxidant, oxidant, antiinflammatory n=4 n4 (n=4 (SOD (GPx (GSR (GST (HO-1) (Keap- OH-1 (ALT (AST (IL-1β (TNF-α (IL-6 (NF-κB (COX-2 Caspase- n= (n= (HO-1 (Keap OH- (IL- (COX- (n (HO- (IL (COX (HO