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Coronary Artery Disease (CAD) originates from a series of events that impair the function of coronary arteries, the blood vessels responsible for delivering oxygen-rich blood to the heart muscle. The pathophysiology of CAD is closely linked to atherosclerosis, a chronic inflammatory and lipid-driven condition affecting the vascular endothelium.1. Endothelial DamageThe process begins with damage to the vascular endothelium, which serves as a protective barrier between the blood and the vessel...
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Coronary Artery Disease (CAD): An Overview with Scientific InsightsCoronary Artery Disease (CAD), often referred to as C-A-D, is a prevalent blood vessel disorder classified under the broader category of atherosclerosis. Atherosclerosis is a pathological process characterized by the hardening and narrowing of arteries due to the accumulation of atherosclerotic plaques. These plaques are composed of cholesterol, fatty substances, inflammatory cells, calcium, and fibrin, reducing blood flow to...
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Myocarditis is inflammation of the myocardium, which is the muscular layer of the heart.EtiologyMyocarditis has a diverse etiology, including a wide range of infectious and non-infectious causes:Infectious CausesViral: Common viruses include Coxsackie A and B, adenovirus, parvovirus B19, enteroviruses, and influenza A.Bacterial: Examples include infections caused by Streptococcus, Staphylococcus, and Mycoplasma species.Rickettsial: Infections like Rocky Mountain spotted fever can result in...
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Myocardial infarction accelerates atherosclerosis.

Partha Dutta1, Gabriel Courties, Ying Wei

  • 1Center for Systems Biology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts 02114, USA.

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This summary is machine-generated.

Myocardial infarction and stroke worsen atherosclerosis by mobilizing stem cells to produce more monocytes. This discovery offers new ways to treat cardiovascular disease progression.

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Area of Science:

  • Cardiovascular Science
  • Immunology
  • Hematology

Background:

  • Myeloid cells contribute to atherosclerotic plaque rupture, leading to myocardial infarction and stroke.
  • Recurrent cardiovascular events are common in survivors due to unknown mechanisms.

Purpose of the Study:

  • To investigate how systemic responses to ischemic injury, such as myocardial infarction or stroke, affect chronic atherosclerosis.
  • To identify the source of increased monocyte recruitment in atherosclerotic plaques after ischemic events.

Main Methods:

  • Utilized Apoe-/- mice models subjected to myocardial infarction or stroke.
  • Analyzed atherosclerotic lesion size and morphology.
  • Investigated monocyte recruitment and hematopoietic stem and progenitor cell mobilization.
  • Examined the role of sympathetic nervous system signaling.

Main Results:

  • Ischemic injury accelerated atherosclerosis, resulting in larger, more advanced lesions in Apoe-/- mice.
  • Monocyte recruitment significantly increased in plaques weeks after myocardial infarction or stroke.
  • Myocardial infarction triggered the release of hematopoietic stem and progenitor cells from bone marrow via sympathetic nervous system signaling.
  • These progenitors migrated to the spleen, leading to sustained elevated monocyte production.

Conclusions:

  • Systemic response to ischemic injury exacerbates atherosclerosis by boosting monocyte production.
  • Sympathetic nervous system signaling plays a key role in mobilizing hematopoietic stem and progenitor cells after myocardial infarction.
  • This study reveals a novel mechanism linking ischemic events to accelerated atherogenesis and suggests potential therapeutic targets.