Dietary fibre supplementation enhances radiotherapy tumour control and alleviates intestinal radiation toxicity.

Background: Non-toxic approaches to enhance radiotherapy outcomes are beneficial, particularly in ageing populations. Based on preclinical findings showing that high-fibre diets sensitised bladder tumours to irradiation by modifying the gut microbiota, along with clinical evidence of prebiotics enhancing anti-cancer immunity, we hypothesised that dietary fibre and its gut microbiota modification can radiosensitise tumours via secretion of metabolites and/or immunomodulation. We investigated the efficacy of high-fibre diets combined with irradiation in immunoproficient C57BL/6 mice bearing bladder cancer flank allografts.

Annexin II Light Chain p11 Interacts With ENaC to Increase Functional Activity at the Membrane.

The epithelial Na channel (ENaC) provides for Na absorption in various types of epithelia including the kidney, lung, and colon where ENaC is localized to the apical membrane to enable Na entry into the cell. The degree of Na entry via ENaC largely depends on the number of active channels localized to the cell membrane, and is tightly controlled by interactions with ubiquitin ligases, kinases, and G-proteins. While regulation of ENaC endocytosis has been well-studied, relatively little is understood of the proteins that govern ENaC exocytosis.