Serum lipopolysaccharide neutralizing capacity in ischemic stroke.

Area of Science:

• Cardiovascular Disease Research
• Microbiology and Immunology
• Biochemistry

Background:

• Periodontitis is linked to cardiovascular diseases, potentially via increased serum lipopolysaccharide (LPS) activity.
• LPS-carrying proteins, such as lipoproteins, influence LPS activity.
• Investigating serum LPS-neutralizing capacity (LPS-NC) may elucidate mechanisms linking periodontitis and cardiovascular risk.

Purpose of the Study:

• To determine the factors influencing serum LPS-NC in patients with ischemic stroke.
• To examine the association between LPS-NC and Aggregatibacter actinomycetemcomitans, a key bacterium in periodontitis.

Main Methods:

• Serum LPS-NC was measured using an assay involving spiked E. coli LPS.
• Levels of LPS-NC, LPS-binding protein (LBP), soluble CD14 (sCD14), lipoproteins, apolipoproteins (A-I, B), and phospholipid transfer protein (PLTP) activity were assessed.
• Immune responses, salivary concentrations, and serotypes of A. actinomycetemcomitans were analyzed in 98 stroke patients and 100 controls.

Main Results:

• Key determinants of LPS-NC included triglycerides, HDL cholesterol, LDL cholesterol, PLTP activity, and IgG against A. actinomycetemcomitans.
• Higher salivary A. actinomycetemcomitans concentration and increased frequency of serotype D were observed in stroke patients.
• Despite differences in determinants, overall LPS-NC levels did not significantly differ between stroke patients and controls.

Conclusions:

• Serum LPS-NC is characterized by low PLTP activity, triglyceride and LDL cholesterol levels, and high HDL cholesterol and IgG against A. actinomycetemcomitans.
• The study concluded that LPS-NC did not show a significant association with ischemic stroke.
• Further research is needed to fully understand the complex interplay between periodontitis, LPS, and cardiovascular health.