Mercury (Hg²⁺) and benzo[a]pyrene (BaP) are ubiquitous and persistent pollution with a number of toxicities in bivalve molluscs. Here, the toxicological responses in the gills of Manila clams, Ruditapes philippinarum, to Hg²⁺ (10 μg L^-1), BaP (<em>3</em> μg L^-1), and their combination have been analysed utilizing transcriptomics and metabolomics approaches.

Comparisons of the transcriptomes and metabolomes of Hg²⁺-and/or BaP-treated clams with management animals revealed the involvement of the detoxing metabolism, immune defence, energy-related pathways, and osmotic regulation in the stress response of R. philippinarum.

Exposure to Hg²⁺ alone primarily enhanced the detoxing and power metabolic pathways by considerably growing the expression of genes related to heat-shock <em>proteins</em> and oxidative phosphorylation. However, co-exposure to Hg²⁺ and BaP triggered better immunotoxicity and disrupted detoxing metabolism, the <em>TCA</em> cycle, glycolysis, and ATP era.

The expression ranges of cytochrome P450 1A1 (CYP1A1), multidrug resistance-associated <em>protein</em> 1 (MRP1), and myosin (MYO), and the exercise of electron transport system (ETS) in gills have been detected, supporting the underlying poisonous mechanisms of Hg²⁺ and BaP. We counsel that the presence of BaP enhances the toxicity of Hg²⁺ by 1) hampering the detoxing of Hg²⁺, 2) growing the immunotoxicity of Hg²⁺, and <em>3</em>) constraining power availability for clams.

The monounsaturated fatty acid (MUFA) oleic acid (OA) has beforehand been proven to reverse saturated fatty acid palmitic acid (PA)-induced hepatic insulin resistance (IR). However, its underlying molecular mechanism is unclear. In addition, earlier research have additionally proven that the ω-<em>3</em> polyunsaturated fatty acid (PUFA) eicosapentaenoic acid (EPA) reverses PA-induced muscle IR, however whether or not EPA performs the identical function in hepatic IR and its potential mechanism concerned want to be additional clarified. Here, we confirmed that EPA reversed PA-induced IR in HepG2 cells and in contrast the proteomic modifications after remedy with completely different free fatty acids (FFAs).

A complete of 2<em>3</em>4 <em>proteins</em> have been decided to be differentially expressed after MUFA remedy. Their features have been primarily associated to responses to stress and endogenous stimuli, lipid metabolic course of, and <em>protein</em> binding. For PUFA remedy, the PA-induced expression modifications of 1<em>3</em>26 <em>proteins</em> could possibly be reversed by EPA remedy, 415 of which have been mitochondrial <em>proteins</em>, with most of the practical <em>proteins</em> concerned in oxidative phosphorylation (OXPHOS) and tricarboxylic acid (<em>TCA</em>) cycle.

Mechanistic research revealed that the <em>protein</em> encoded by JUN and reactive oxygen species (ROS) play a job in OA- and EPA-reversed PA-induced IR, respectively. EPA or OA alleviated PA-induced irregular adenosine triphosphate (ATP) manufacturing, ROS era, and calcium (Ca²⁺) content material. Importantly, H₂O₂-activated manufacturing of ROS elevated the <em>protein</em> expression of JUN, additional leading to IR in HepG2 cells. Taken collectively, we exhibit that ROS/JUN is a standard response pathway employed by HepG2 cells towards FFA-regulated IR.