Impact of myocardial infarction on cerebral homeostasis: exploring the protective role of estrogen

Abstract

Myocardial infarction (MI), commonly known as a heart attack, results from the rupture of atherosclerotic plaques in coronary arteries, which triggers a series of pathological events including cardiomyocyte death, thrombus formation, and systemic inflammation. These pathological events lead to significant structural and functional changes in the heart, potentially precipitating heart failure. The ramifications of MI extend beyond cardiac dysfunction and impact cerebral health. Accordingly, this review examines the cerebral implications of MI, focusing on how systemic inflammation and reduced cardiac output post-MI affect cerebral blood flow and brain function. MI-induced changes in cardiac output can lead to cerebral hypoperfusion, while neuroinflammation and increased blood-brain barrier permeability contribute to cognitive decline and neuronal damage, with potential links to Alzheimer's disease (AD). Furthermore, the review explores the role of estrogen in modulating cardiovascular and cerebral health, particularly in postmenopausal women who exhibit distinct cardiovascular risk profiles. Estrogen protects the heart by regulating local renin-angiotensin-aldosterone system and has significant impacts on brain function. Declining estrogen levels during menopause exacerbate neuroinflammation and cognitive deficits, highlighting the importance of estrogen in maintaining cerebrovascular function. Experimental studies on estrogen replacement therapies, including 17β-estradiol and selective estrogen receptor modulators, show potential in mitigating these detrimental effects, enhancing neurogenesis, and improving cognitive outcomes. Estrogen therapy is crucial in preventing cognitive decline and reducing amyloid plaque formation in Alzheimer's models. This review underscores the potential benefits of estrogen therapy in promoting brain recovery post-MI and improving functional outcomes.

Keywords

MI / heart failure / inflammation / cerebral hypoperfusion / blood-brain barrier / cognitive decline / AD / 17β-estradiol / menopause

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