A Novel UPLC-MS/MS Method Identifies Organ-Specific Dipeptide Profiles.

Area of Science:

• Metabolomics
• Biochemistry
• Physiology

Background:

• Amino acids are crucial for cell metabolism, with intracellular changes linked to disease pathogenesis.
• The specific roles and organ distribution of dipeptides remain largely uncharacterized.

Purpose of the Study:

• To establish a method for quantifying multiple dipeptides.
• To investigate the organ-specific distribution of dipeptides in mice.
• To correlate dipeptide profiles with amino acid profiles.

Main Methods:

• Developed a sensitive UPLC-MS/MS method for quantifying 36 dipeptides.
• Analyzed dipeptide patterns in various mouse tissues (adipose, brain, heart, kidney, liver, lung, muscle, etc.), serum, and urine.
• Related dipeptide profiles to corresponding amino acid concentrations.

Main Results:

• Detected 30 out of 36 dipeptides with significant organ-specific distribution.
• Carnosine and anserine were most abundant, particularly in muscles.
• Observed distinct dipeptide profiles in liver, spleen, thymus, and serum, with lower concentrations in serum.
• Found higher concentrations of C-terminal proline dipeptides compared to N-terminal proline dipeptides.
• Correlated tissue amino acid concentrations with specific dipeptide profiles.

Conclusions:

• The developed multi-dipeptide quantification approach reveals organ-specific dipeptide distribution.
• This methodology enhances understanding of dipeptide metabolism in both healthy and diseased states.