Changes in serum lipoprotein pattern induced by acute infections

Area of Science:

• Biochemistry
• Clinical Medicine
• Lipid Metabolism

Background:

• Acute infections are known to trigger systemic inflammatory responses.
• Lipid and lipoprotein profiles are crucial indicators of cardiovascular health.
• The impact of acute infections on specific lipoprotein fractions and their enzymatic regulation requires detailed investigation.

Purpose of the Study:

• To investigate the dynamic changes in serum lipids and lipoproteins during acute infections.
• To analyze alterations in apolipoproteins and lipolytic enzyme activities.
• To compare these changes across viral and bacterial infections during acute, convalescent, and recovery phases.

Main Methods:

• Measurement of lipoprotein concentrations and compositions in 72 infectious patients.
• Quantification of apoproteins A-I, A-II, and B.
• Assay of postheparin lipolytic enzyme activities: lipoprotein lipase (LPL) and hepatic lipase (HL).

Main Results:

• Significant reductions in low-density lipoprotein (LDL) and high-density lipoprotein (HDL)2 mass concentrations, cholesterol, phospholipid, and protein content during acute infections.
• LDL became triglyceride-enriched and cholesterol-poor, while HDL cholesterol/LDL cholesterol ratio decreased during convalescence.
• Decreased concentrations of apo A-I and apo A-II; altered VLDL composition during convalescence; reduced LPL activity throughout infection phases and HL activity during the acute phase.

Conclusions:

• Acute infections induce significant, phase-dependent alterations in lipid and lipoprotein metabolism.
• These alterations, including changes in LDL and HDL composition and enzyme activities, may contribute to increased cardiovascular risk.
• Understanding these metabolic shifts is crucial for managing infectious diseases and their long-term sequelae.