LPS/TLR4 Pathway Regulates IgA1 Secretion to Induce IgA Nephropathy

Area of Science:

• Immunology
• Nephrology
• Microbiology

Background:

• Intestinal flora imbalance is linked to IgA nephropathy (IgAN) incidence and severity.
• This imbalance may affect intestinal immunity and B cell subsets, leading to increased IgA production and deposition in the kidneys.

Purpose of the Study:

• To investigate if the LPS/TLR4 pathway regulates mesenteric B cells to secrete galactose-deficient IgA1 (Gd-IgA1), thereby inducing IgA nephropathy.

Main Methods:

• An animal study using a mouse model of IgA nephropathy was conducted.
• Mice were divided into five groups, including control, IgAN model, and intervention groups treated with anti-TLR4 antibody and/or glutamine enteric-coated capsules (GEC).
• Various assays, including ELISA, immunofluorescence, HE staining, and western blotting, were used to analyze physiological indicators, inflammatory factors, B cell distribution, kidney damage, and protein expression.

Main Results:

• All measured indicators, including physiological markers, inflammatory factors, B lymphocytes, IgA deposition, kidney pathology, and immune-related protein expression, showed a consistent trend across the groups.
• The trend indicated that the IgAN group had the most severe condition, while the normal control (NC) group had the least, with intervention groups showing intermediate improvements.

Conclusions:

• The LPS/TLR4 pathway plays a role in IgA nephropathy by regulating mesenteric B cells to secrete Gd-IgA1.
• TLR4 antibody and GEC treatments targeting the intestinal tract can help repair intestinal function and alleviate IgAN.
• These findings suggest a new potential therapeutic strategy for IgA nephritis by modulating the gut-kidney axis.