Paraoxonase 1, HDL Subclasses and Post Surgery Acute Inflammation: A Pilot Study

Area of Science:

• Biochemistry
• Immunology
• Oncology

Background:

• High-density lipoproteins (HDL) are crucial for lipid transport and cardiovascular health.
• Paraoxonase 1 (PON1) is an HDL-associated enzyme with antioxidant properties.
• Understanding inflammation's impact on HDL and PON1 is vital for managing diseases like colorectal cancer.

Purpose of the Study:

• To investigate the effects of acute inflammation on PON1 activity and HDL subclasses in post-surgical colorectal cancer patients.
• To assess the relationship between PON1 activity, HDL subclasses, and inflammatory markers.

Main Methods:

• Kinetic measurement of PON1 arylesterase and lactonase activity.
• Quantification of HDL subclasses using the Quantimetrix Lipoprint® System.
• Analysis of inflammatory markers: white blood cells (WBC), C-reactive protein (CRP), and serum amyloid A (SAA).

Main Results:

• Baseline PON1 activity was lower in colorectal cancer patients.
• Significant reductions in PON1 activity were observed in the acute inflammatory state post-surgery.
• PON1 activity showed an inverse relationship with inflammatory markers (SAA and CRP).
• Preliminary findings indicated a decrease in small and intermediate HDL subclasses post-operation.

Conclusions:

• Chronic and acute inflammation negatively impact PON1 activity, with further decreases during acute inflammatory states.
• Small HDL subclasses decreased, accompanied by a loss of PON1 activity in the subacute phase.
• Inflammation affects both PON1 function and HDL particle composition in colorectal cancer patients.