Impaired intestinal barrier function in a mouse model of hyperuricemia

Area of Science:

• Gastroenterology
• Nephrology
• Immunology

Background:

• Hyperuricemia is known to affect organs like kidneys, joints, and heart.
• The impact of hyperuricemia on intestinal health remains largely unexplored.

Purpose of the Study:

• To investigate intestinal barrier dysfunction in a mouse model of hyperuricemia.
• To explore the relationship between hyperuricemia, intestinal permeability, and inflammation.

Main Methods:

• Urate oxidase (Uox) gene knockout to induce hyperuricemia in mice.
• Histopathological analysis (H&E, Alcian blue staining) of intestinal morphology.
• Measurement of serum and tissue uric acid, inflammatory markers (TNF-α, IL-6), uremic toxins, and intestinal permeability markers (DAO, D-Lactate, endotoxins).
• Assessment of tight junction protein expression (ZO-1, occludin) via RT-qPCR, Western blotting, and immunohistochemistry.

Main Results:

• Uox-knockout mice exhibited spontaneous hyperuricemia with intestinal defects (sparse villi, mucosal edema, reduced mucus).
• Hyperuricemic mice showed downregulated tight junction proteins (ZO-1, occludin) and increased serum markers of intestinal permeability (DAO, D-Lactate, endotoxins).
• Elevated serum and intestinal levels of IL-6 and TNF-α were observed, alongside increased uremic toxins (indoxyl sulfate, p-cresol sulfate).

Conclusions:

• Hyperuricemia induces intestinal barrier dysfunction and increased intestinal permeability in mice.
• The observed intestinal damage may be associated with uric acid-induced inflammatory responses.
• Further research is needed to fully elucidate the mechanisms linking hyperuricemia and intestinal epithelial barrier dysfunction.