Uremic toxins are conditional danger- or homeostasis-associated molecular patterns

Area of Science:

• Biochemistry
• Molecular Biology
• Nephrology

Background:

• Uremic toxins (UTs) are implicated in the pathogenesis of chronic kidney disease (CKD) and cardiovascular disease (CVD).
• The precise role of UTs in modulating inflammation and their gene expression patterns in disease states remain incompletely understood.

Purpose of the Study:

• To investigate the expression changes of UT receptors and synthases in CKD and CVD.
• To analyze the role of UTs as molecular patterns (DAMPs and HAMPs) in inflammation.
• To elucidate the regulatory pathways of UT gene expression in CKD and coronary artery disease (CAD).

Main Methods:

• Mining of novel uremic toxin (UT) metabolomics and gene expression databases.
• Analysis of UT expression levels and their impact on inflammatory molecules.
• Examination of UT gene expression modulation in CKD, CVD, and CAD patient cohorts.

Main Results:

• UTs constitute a small fraction of the human serum metabolome but are elevated in CKD and CVD.
• UTs can induce or suppress inflammatory molecule expression, acting as DAMPs and HAMPs.
• UT gene expression is significantly modulated in CKD and CAD, upregulated by caspase-1 and TNF-alpha pathways, and inhibited by regulatory T cells.

Conclusions:

• UTs are selectively increased in CKD and CVD and play a role in modulating inflammation.
• UT gene upregulation in CKD and CAD is mediated by inflammatory pathways, not solely passive accumulation.
• UTs function as critical signaling molecules in the context of kidney and cardiovascular diseases.