Profiling of bioactive lipids in different dendritic cell subsets using an improved multiplex quantitative LC-MS/MS...

Area of Science:

• Immunology
• Biochemistry
• Cell Biology

Background:

• Bioactive lipids are crucial signaling molecules in physiological and pathological processes.
• Accurate quantification of diverse bioactive lipids, often present in trace amounts, remains challenging.

Purpose of the Study:

• To develop and validate an improved multiplex method for simultaneous quantification of numerous bioactive lipids.
• To investigate the distinct bioactive lipid profiles produced by conventional dendritic cells (cDCs) and all-trans retinoic acid-treated DCs (RA-DCs).

Main Methods:

• Development of an enhanced multiplex assay capable of measuring 90 different bioactive lipid compounds.
• Application of the assay to quantify lipids produced by RA-DCs (a type of tolerogenic DC) and cDCs.
• Analysis of gene expression (mRNA) related to key lipid biosynthesis enzymes in both DC subsets.

Main Results:

• The improved method successfully quantified 90 bioactive lipids simultaneously.
• cDCs were found to produce inflammatory lipid mediators, including leukotrienes.
• RA-DCs produced anti-inflammatory lipid mediators, such as prostaglandin I2, and showed higher expression of related biosynthesis enzymes.

Conclusions:

• The developed multiplex method is effective for comprehensive bioactive lipid quantification.
• Distinct lipid mediator profiles distinguish cDCs from RA-DCs, highlighting their opposing roles in immune responses.
• This methodology aids in elucidating the specific functions of bioactive lipids in immune system regulation.