The HDL Proteome Watch: Compilation of studies leads to new insights on HDL function

Area of Science:

• Proteomics
• Biochemistry
• Molecular Biology

Background:

• High-density lipoproteins (HDL) are complex particles with diverse protein compositions dictating their functions.
• Accurate and sensitive identification of HDL-associated proteins is crucial for understanding HDL's biological roles.
• The heterogeneity of HDL necessitates comprehensive proteomic analysis.

Purpose of the Study:

• To highlight the HDL Proteome Watch Database as a resource for tracking global proteomics studies on HDL.
• To consolidate and analyze identified proteins associated with HDL particles.
• To explore the functional implications of the HDL proteome beyond traditional roles.

Main Methods:

• Systematic tracking of proteomics studies from various international laboratories.
• Compilation and analysis of protein identification data from published reports.
• Cross-referencing protein identifications across multiple studies to establish consensus findings.

Main Results:

• Nearly 1000 individual proteins have been detected in HDL preparations across 45 published reports.
• 251 proteins were identified in HDL by at least three independent laboratories, forming a consensus HDL proteome.
• Consensus HDL proteins are implicated in functions extending beyond lipid transport, including innate immunity, inflammation, cell adhesion, hemostasis, protease regulation, and vitamin/metal binding.

Conclusions:

• The HDL proteome, derived from multiple studies and methodologies, provides robust protein identifications.
• These findings offer novel insights into the multifaceted functions of HDL particles.
• Further research is needed to address significant issues and fully elucidate the HDL proteome's implications.