Related Experiment Video
Updated: Jul 5, 2026
06:35
An Immunohistopathologic Study to Profile the Folate Receptor Beta Macrophage and Vascular Immune Microenvironment in Giant Cell Arteritis
Published on: February 8, 2019
Occurrence of giant cell arteritis...suddenly
Brian R Younge1, Cornelia M Weyand, Jorg J Goronzy
1Department of Ophthalmology, Mayo Clinic, Rochester, Minnesota, USA.
Transactions of the American Ophthalmological Society
|April 23, 2008
Summary
Giant cell arteritis involves early dendritic cell activation, preceding visible inflammation. This cellular maturation marks the onset and progression of this serious vascular condition.
Area of Science:
- Immunology
- Pathology
- Vascular Biology
Background:
- Giant cell arteritis (GCA) is a systemic vasculitis affecting large arteries.
- Understanding the early pathogenesis of GCA is crucial for timely diagnosis and treatment.
Observation:
- Initial temporal artery biopsy showed no pathological changes but early inflammatory marker activation.
- A subsequent biopsy revealed high levels of IL-18 and CCL19, with mature dendritic cells.
Findings:
- Dendritic cell activation is an early event in arteritis development.
- Vascular dendritic cell maturation correlates with the progression of histopathologically evident GCA.
- Partial dendritic cell activation is also observed in polymyalgia rheumatica without overt arteritis.
Implications:
- Dendritic cells play a key role in initiating and driving the inflammatory process in GCA.
- These findings suggest dendritic cell activation could be a potential biomarker for early GCA detection.
- Targeting dendritic cell pathways may offer novel therapeutic strategies for GCA.
Related Concept Videos
01:19Hypersensitivity Reactions: Immune-Complex Reactions
Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...
01:26Transient Ischemic Attack l: Introduction
A transient ischemic attack (TIA) is a brief episode of neurological dysfunction caused by a temporary, focal reduction in cerebral blood flow. Although symptoms resemble those of an ischemic stroke, the interruption in perfusion is short-lived and does not cause permanent infarction. TIAs are clinically important because they often serve as early warning events for future stroke.Mechanisms of Transient Cerebral IschemiaTransient cerebral ischemia may arise through several mechanisms. One...
01:21Aneurysm II: Clinical Manifestations and Diagnostic Studies
Thoracic, aortic arch and abdominal aneurysms are significant vascular conditions that can present with various clinical manifestations and lead to serious complications. Understanding these manifestations and the appropriate diagnostic studies is essential for effective management and treatment.Thoracic Aortic AneurysmsThoracic aortic aneurysms often remain asymptomatic until they reach a size that impinges on adjacent structures. They typically cause deep, diffuse chest pain that radiates to...
01:26Acute Inflammation I: Inflammatory Response
Acute inflammation is a rapid, short-lived physiological response to tissue injury or infection, designed to eliminate harmful agents and initiate repair. This tightly regulated process typically lasts from minutes to several days and is triggered by factors such as microbial invasion, physical trauma, or chemical injury.Recognition and Mediator ReleaseThe inflammatory response begins when resident immune cells—such as mast cells, macrophages, and dendritic cells—detect damage-associated...
01:25Acute Inflammation III: Local and Systemic Effects
Acute inflammation produces a coordinated set of local and systemic changes that limit injury, eliminate pathogens, and initiate repair. These responses arise within minutes of infection, trauma, or chemical insult and are driven by vascular alterations and leukocyte-derived mediators. When the stimulus resolves, the reaction typically abates within days.Local EffectsAt the site of injury, arteriolar vasodilation increases blood flow, resulting in redness and warmth. Simultaneously, increased...
01:19Encephalitis l: Introduction
Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...