Targeting the Adenosine-Mediated Metabolic Immune Checkpoint with Engineered Probiotic for Enhanced Chemo-Immunotherapy.

ABSTRACT: Immunotherapy has revolutionized cancer treatment by leveraging the patient's immune system, yet its efficacy is often hampered by the immunosuppressive tumor microenvironment (TME). Adenosine, a key player in this milieu, suppresses immune cell activity via cAMP signaling. Here, an innovative strategy to remodel the TME using a genetically engineered strain of Escherichia coli Nissle 1917 that expresses adenosine deaminase on its surface under hypoxic conditions is presented. This engineered probiotic targets tumors, converts immunosuppressive adenosine to inosine, and enhances anti-tumor immune responses. In vivo, the engineered probiotic significantly improved immune cell infiltration and demonstrated synergistic effects with low-dose doxorubicin in both subcutaneous and orthotopic mous

SUBMITTER: Wang J 

PROVIDER: S-EPMC12005768 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature