Hemodialysis removes protective metabolites and disrupts mitochondrial function

Area of Science:

• Biochemistry
• Metabolomics
• Renal Medicine

Background:

• Metabolic analyses provide insights into hemodialysis-induced biochemical changes.
• Previous studies used targeted approaches or lacked comprehensive pathway analysis.
• This study utilizes semi-targeted metabolomics to investigate metabolic shifts in hemodialysis patients.

Purpose of the Study:

• To comprehensively analyze the metabolic alterations in hemodialysis patients using semi-targeted metabolomics.
• To identify specific metabolites affected by hemodialysis and understand their pathway implications.

Main Methods:

• Collected pre- and post-dialysis plasma samples from 43 hemodialysis patients.
• Analyzed samples using ultra-performance liquid chromatography coupled with quadrupole time-of-flight mass spectrometry (UPLC-QToF-MS).
• Employed principal component analysis (PCA), orthogonal partial least squares discriminant analysis (OPLS-DA), and variable importance in projection (VIP) scores for data analysis.

Main Results:

• Hemodialysis significantly altered the plasma metabolome, with 79 metabolites showing changes.
• Harmful solutes (e.g., 3-indoxyl sulfate) and protective compounds (e.g., L-carnitine, quinic acid) were reduced.
• Lipotoxic intermediates (e.g., myristic acid, linoleic acid) increased, indicating disruptions in lipid metabolism.

Conclusions:

• Hemodialysis impacts the plasma metabolome by removing toxins but also depleting beneficial metabolites and increasing lipotoxic intermediates.
• These metabolic shifts may compromise the therapeutic benefits of dialysis.
• Strategies are needed to preserve metabolic homeostasis in hemodialysis patients.