Core Viewpoint - The study highlights the role of the oral symbiotic bacterium Veillonella in promoting Clostridioides difficile infection (CDI) in patients with Crohn's disease by inhibiting bile acid transport protein ASBT, leading to abnormal bile acid accumulation in the intestine [3][9]. Group 1: Disease Overview - Crohn's disease is a common inflammatory bowel disease (IBD) characterized by abdominal pain, diarrhea, and intestinal obstruction, affecting the entire digestive tract with a high postoperative recurrence rate of approximately 80% [2]. - The global prevalence of IBD was 0.75% as of 2020, projected to rise to 1.0% by 2030, with 37%-59% of IBD cases being Crohn's disease [2]. Group 2: Research Findings - The research published in Cell Host & Microbe indicates that Veillonella intestinal colonization promotes CDI in Crohn's disease patients [3]. - Veillonella parvula inhibits the expression of the bile acid transport protein ASBT, preventing bile acid reabsorption and causing abnormal bile acid accumulation in the intestine, which triggers CDI [9][12]. - The study found a correlation between the abundance of Veillonella and increased bile acid metabolism in Crohn's disease patients, suggesting that the presence of bile acids can facilitate the germination of C. difficile spores [9][12].

Core Viewpoint - Exercise is recognized as a significant factor in reducing cancer risk, enhancing the survival of cancer patients, and improving treatment outcomes, particularly through its effects on the gut microbiome and immune response [2][4][6]. Group 1: Research Findings - A study published in the journal Cell indicates that exercise induces the production of the gut microbiota metabolite formate, which enhances CD8 T cell antitumor immunity and improves the efficacy of cancer immunotherapy [3][4]. - The research highlights that the gut microbiome's metabolic products, rather than the microbiome itself, are crucial for the antitumor effects of exercise [9][10]. - The study identifies Nrf2 as a key mediator in the enhancement of Tc1 cell function driven by formate, both in vitro and in vivo [11]. Group 2: Implications for Cancer Treatment - The findings suggest that high-producing formate gut microbiota in humans can enhance tumor suppression and promote robust antitumor Tc1 immune responses, indicating formate as a potential biomarker for enhancing Tc1-mediated antitumor immunity [12][15]. - The research opens avenues for developing treatment strategies that combine exercise with microbiota-derived metabolites, particularly focusing on Nrf2 agonists like formate for patients resistant to immune checkpoint inhibitors [16][17].

Core Viewpoint - The interaction between diet, phytochemicals, gut microbiome, and the liver significantly influences the anticancer activity of PI3K inhibitors, challenging previous assumptions about the role of macronutrients in this process [2][11]. Group 1: PI3K Inhibitors and Cancer Treatment - PI3K signaling pathway is crucial in insulin action and is frequently activated in human cancers, with approved PI3K inhibitors used for treating leukemia, lymphoma, and breast cancer [2]. - Preclinical studies indicate that ketogenic diets can enhance the efficacy of PI3K inhibitors in cancer treatment, although the underlying mechanisms were previously unclear [2][5]. - A recent study published in Cell reveals that the synergistic anticancer effect of ketogenic diets and PI3K inhibitors is not related to macronutrient composition but rather to the metabolism of dietary phytochemicals by gut microbiota [3][7]. Group 2: Role of Diet and Gut Microbiome - Dietary interventions can influence disease progression and drug response, with various diets shown to slow tumor growth and enhance anticancer drug activity in preclinical models [5]. - The study highlights that the differences in diets extend beyond macronutrient composition, emphasizing the importance of phytochemicals and their interactions with gut microbiota [6][8]. - Gut microbiota can metabolize phytochemicals from the diet, leading to the production of metabolites that affect drug metabolism and efficacy [7][9]. Group 3: Key Findings of the Study - Purified rodent diets can sensitize tumors to PI3K inhibitors independently of macronutrient composition [9]. - The sensitizing effect involves changes in drug metabolism by liver cytochrome P450 enzymes [9]. - Specific phytochemicals, such as soyasaponins, are metabolized by gut microbiota into compounds that can reduce the levels and activity of PI3K inhibitors [9][11].