Chronic Systemic Immune Dysfunction in African-Americans with Small Vessel-Type Ischemic Stroke

Area of Science:

• Neurology
• Immunology
• Cardiovascular Research

Background:

• Lacunar ischemic strokes disproportionately affect African-Americans.
• Chronic inflammatory changes following lacunar stroke are not well understood.
• Understanding these inflammatory changes is crucial for targeted interventions.

Purpose of the Study:

• To investigate serum inflammatory and thrombotic biomarkers in African-Americans post-lacunar stroke.
• To assess immune responsiveness in individuals with a history of lacunar stroke.
• To elucidate chronic inflammatory alterations associated with lacunar stroke.

Main Methods:

• Serum biomarkers, including soluble vascular cadherin adhesion molecule-1 (sVCAM-1) and thrombin anti-thrombin (TAT), were measured in African-Americans with lacunar stroke (n=30) and controls (n=37).
• Peripheral blood mononuclear cells were stimulated with lipopolysaccharide (LPS) to evaluate immune responsiveness in a subset of participants.
• Statistical analyses adjusted for relevant covariates to identify independent associations.

Main Results:

• Elevated levels of pro-inflammatory biomarkers sVCAM-1 and TAT were independently associated with lacunar stroke.
• Immune responsiveness to LPS challenge was significantly abnormal in stroke cases compared to controls.
• Results suggest a chronically compromised systemic inflammatory response in African-Americans with lacunar stroke.

Conclusions:

• African-Americans with lacunar stroke exhibit elevated VCAM-1 and TAT levels.
• A compromised systemic inflammatory response persists beyond six weeks post-stroke.
• Findings highlight the role of chronic inflammation in lacunar stroke pathophysiology.