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The fact that Fat -1 transgenic mice producing n -3 polyunsaturated fatty acids via overexpressed 3-desaturase significantly mitigated Helicobacter pylori ( H. pylori )-associated gastric tumorigenesis through rejuvenation of chronic atrophic gastritis (CAG) led us to study whether dietary intake of walnut plentiful of n -3 PUFAs can be nutritional intervention to prevent H. pylori -associated gastric cancer. In our model that H. pylori -initiated, high salt diet-promoted gastric carcinogenesis, pellet diet containing 100 mg/kg and 200 mg/kg walnut was administered up to 36 weeks. As results, control mice (24 weeks) developed significant chronic CAG, in which dietary walnuts significantly ameliorated chronic atrophic gastritis. Expressions of COX-2/PGE 2 /NF-κB/c-Jun, elevated in 24 weeks control group, were all significantly decreased with walnut ( p &lt;0.01). Tumor suppressive enzyme, 15-PGDH, was significantly preserved with walnut. Control mice (36 weeks) all developed significant tumors accompanied with severe CAG. However, significantly decreased tumorigenesis was noted in group treated with walnuts, in which expressions of COX-2/PGE 2 /NF-κB/IL-6/STAT3, all elevated in 36 weeks control group, were significantly decreased with walnut. Defensive proteins including HO-1, Nrf2, and SOCS-1 were significantly increased in walnut group. Proliferative index as marked with Ki-67 and PCNA was significantly regulated with walnut relevant to 15-PGDH preservation. Conclusively, walnut can be an anticipating nutritional intervention against H. pylori .

Dietary intake of walnut prevented <i>Helicobacter pylori</i>-associated gastric cancer through rejuvenation of chronic atrophic gastritis