To conclude, these results suggest that the TLR4/TRIF pathway plays a role in GDN shogaol-mediated activation of Nrf2 in mouse hepatocytes. == Oral administration of GDN protects mice from alcohol-induced liver damage == Ethanol-induced oxidative damage in the liver involves depletion Rabbit Polyclonal to CLIP1 of antioxidants. liver damage but sheds light on studying the cellular and molecular mechanisms underlying interspecies communication in the liver via edible plantderived nanoparticles. Keywords: ginger nanoparticles, shogaol, Nrf2 detoxic effect, TLR4/TRIF pathway, alcoholic liver injury Recently, nanoparticles have been isolated and identified from edible plants including ginger (1, 2) and lemon (3). Numerous naturally occurring nanoparticles exist in our diet and are absorbed through the intestine daily. Whether nanoparticles from plants we eat daily can pass from the intestine to the liver, and subsequently, have a biological effect on the liver is poorly defined. Studies show that ginger has a hepatoprotective effect against ethanol, carbon tetrachloride and acetaminophen-induced hepatotoxicity (2). Shogaols, dehydrated analogues of the gingerols, have been a major focus ofin vitroresearch related to the anti-inflammatory effects of ginger (3). To date, however , most of the data presented are derived from using shogaol-enriched ginger extract. The biological effect of shogaols in the context of ginger has not been investigated. Edible plantderived nanoparticles are present in the extracts of ginger and consist of proteins, lipids and RNAs (2). Emerging evidence suggests that exosomes can transfer information including lipids into recipient cells (46). Exosomes including mammalian cellderived exosomes encapsulate more than 100 different lipids, and the biological effects of exosomal lipids on recipient cells have not been studied in detail. In addition , it is very difficult in determining the biological effect of individual exosomal lipids on the recipient cells with current approaches in general. The liver receives numerous and varied biological insults daily. The induction of cytoprotective enzymes, including antioxidant and carcinogen-detoxification enzymes, is critical for maintaining hepatic homeostasis and preventing injury from absorbed endotoxin. Nuclear factor erythroid 2-related factor 2 (Nrf2) transcriptionally controls the gene expression of many cytoprotective enzymes and plays an important role in protecting liver against insults (79). We have recently shown that nanoparticles isolated from grape and grapefruit can modulate mouse stem cell and macrophage CXCR2-IN-1 behaviour and protect mice against dextran sulphate sodium (DSS)induced colitis. In this study, we hypothesized that unlike the free form of shogaols, shogaols carried by ginger-derived nanoparticles (GDNs) can be target-delivered to hepatocytes and protect mice from alcohol-induced liver injury. == Materials and methods == == Isolation and characterization of GDENs == Fresh ginger rhizome roots were purchased from a local market and washed 3 with PBS. A total of 200 g of washed roots were ground in a mixer (Osterizer 12-speed blender) at the highest speed for 10 min (pause 1 min for every 1 min blending). Ginger juice was then sequentially centrifuged at 1, 000gfor 10 min, 3, 000gfor 20 min and 10, 000gfor 40 min. After 10, 000gcentrifugation, the pellet was resuspended in PBS and referred to as microparticles. The supernatant was then centrifuged at 150, 000gfor 90 min, the pellet was resuspended in PBS and transferred to a sucrose step gradient (8%/30%/45%/60%) and centrifuged at 150, 000gfor 120 min. The bands between the 8%/30% layer and CXCR2-IN-1 the 30%/45% layer were harvested separately and noted as GDN and GDEN2. The protein concentration of the samples was determined using a BCA assay kit (Thermo Scientific). == Mice == C57BL/6j mice, 68 weeks of age, were obtained from Jackson Laboratories. MyD88, TRIF, and TLR4 KO mice on a B6 background were kindly provided by Dr . Shizuo Akira (University of Osaka, Osaka, Japan). All animal procedures were approved by the University of Louisville Institutional Animal Care and Use Committee. For the mice CXCR2-IN-1 alcoholic liver disease model, 8-week-old male C57BL/6j mice were fed a liquid diet containing 5% ethanol for 13 days and on day 14 the mice were gavaged with a single dose of ethanol (5 g/kg body weight, 30% ethanol). The GDN treatment studies were conducted by gavage administering GDN (50 mg/mouse/day) or PBS as a control for 7 days prior to the ethanol diet and then continuously giving the GDN or PBS to the mice after they were fed the 5% ethanol diet. On day 14, after the 30% ethanol feeding, and 9 h post-gavaged with the last GDN treatment, the mice were CXCR2-IN-1 euthanized, and serum and liver were harvested for examination. == Lipid extraction, TLC and lipidomic analysis == Total lipid extraction of GDENs was performed according to the method of Bligh and.