Mouse Study Links 12 Diets to Stronger PD-1 Response via L. johnsonii and DAT
Updated
Updated · Nature.com · Jul 8
Mouse Study Links 12 Diets to Stronger PD-1 Response via L. johnsonii and DAT
1 articles · Updated · Nature.com · Jul 8
Summary
Across 12 mouse diet models, anti-PD-1 efficacy tracked with the diet-gut axis rather than body weight, glucose intolerance or a composite metabolic dysfunction score.
Lactobacillus johnsonii emerged as a key responder-associated bacterium, and its combination with a high-fat diet drove tumor regression and even complete responses in some anti-PD-1-treated mice.
A 48-hour switch from a non-responder psyllium diet to a high-fat diet restored sensitivity, while the reverse switch blunted response, showing the microbiome could be rapidly remodeled before obesity developed.
Desaminotyrosine, a tyrosine-derived microbial metabolite, rose in responder models and DAT supplementation alone made psyllium-fed mice responsive to anti-PD-1, pointing to a functional mechanism.
In translational tests, fecal transplants from 6 higher-BMI human donors outperformed 3 lower-BMI donors in sensitizing mice to anti-PD-1, suggesting short-term diet or metabolite-based strategies could complement FMT.
Could a bacterial pill provide the cancer-fighting benefits of an unhealthy diet, but without the health risks?
With drugs like Ozempic also boosting immunity, are we entering a new era of metabolic cancer therapy?
From Diet to Microbes: Transforming Cancer Immunotherapy with Gut Microbiome Insights
Overview
Recent scientific breakthroughs have revealed that the gut microbiome is a key mediator between diet and the effectiveness of cancer immunotherapies. Short-term dietary changes can create an optimal internal environment, leading to better responses to treatments like immune checkpoint inhibitors. Researchers are now exploring how specific bacteria and their metabolites can positively influence the body’s ecosystem, opening up new therapeutic possibilities. This evolving understanding suggests that strategic dietary adjustments and targeted microbial interventions could become important tools for enhancing cancer treatment outcomes in the future.