Related Experiment Video

Updated: Aug 7, 2026

Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates
09:12

Isolation of Cortical Microglia with Preserved Immunophenotype and Functionality From Murine Neonates

Published on: January 30, 2014

Inflammation and neurodegenerative diseases

W Sue T Griffin1

  • 1Donald W Reynolds Department of Geriatrics, The University of Arkansas for Medical Sciences, and the Geriatric Research Education Clinical Center, Central Arkansas Veterans Healthcare System, Little Rock, AR 72205, USA. griffinsuet@uams.edu

The American Journal of Clinical Nutrition
|February 14, 2006
PubMed

Insights

Alzheimer disease involves brain inflammation driven by activated microglia releasing interleukin 1. This self-amplifying inflammatory process over years leads to neuronal death and the disease's cognitive decline.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Alzheimer disease (AD) is characterized by cognitive decline and brain pathology, including plaques and tangles.
  • The precise mechanisms driving AD pathogenesis remain unclear.
  • Emerging evidence implicates microglial activation and neuroinflammation.

Purpose of the Study:

  • To elucidate the role of microglial activation and interleukin 1 in Alzheimer disease pathogenesis.
  • To characterize the inflammatory cascade initiated by microglia in AD.

Main Methods:

  • The study focuses on the proposed inflammatory cascade involving microglia and interleukin 1.
  • Mechanisms of microglial activation and cytokine overexpression are discussed.
  • Pathways leading to neuronal death and amplification of inflammation are examined.

Main Results:

  • Microglial activation initiates a self-sustaining inflammatory cascade.
  • Overexpression of the proinflammatory cytokine interleukin 1 by microglia is a key mediator.
  • Interleukin 1 triggers neuronal death, further activating microglia and amplifying inflammation.

Conclusions:

  • A chronic, low-grade neuroinflammatory process driven by microglia and interleukin 1 contributes significantly to Alzheimer disease.
  • This self-amplifying inflammation leads to progressive neuronal loss and clinical symptoms over years.
  • Understanding this inflammatory pathway may offer therapeutic targets for Alzheimer disease.

More Related Videos

Improved 3D Hydrogel Cultures of Primary Glial Cells for In Vitro Modelling of Neuroinflammation09:19

Improved 3D Hydrogel Cultures of Primary Glial Cells for In Vitro Modelling of Neuroinflammation

Published on: December 8, 2017

Brain Ventricular Microinjections of Lipopolysaccharide into Larval Zebrafish to Assess Neuroinflammation and Neurotoxicity07:31

Brain Ventricular Microinjections of Lipopolysaccharide into Larval Zebrafish to Assess Neuroinflammation and Neurotoxicity

Published on: August 23, 2022

Related Concept Videos

Inflammation01:38

Inflammation

Overview
Bacterial Meningitis II: Pathophysiology01:26

Bacterial Meningitis II: Pathophysiology

Bacterial meningitis typically begins when pathogens such as Neisseria meningitidis and Streptococcus pneumoniae colonize the nasopharynx and invade the bloodstream. This process is facilitated by bacterial virulence factors, such as polysaccharide capsules, which resist phagocytosis and complement-mediated killing. Less commonly, bacteria reach the central nervous system via contiguous spread from infections like otitis media or sinusitis, through congenital or acquired dural defects, or...
Encephalitis ll: Pathophysiology01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...
Alzheimer Disease l: Introduction01:29

Alzheimer Disease l: Introduction

Alzheimer disease is a chronic, progressive, and irreversible neurodegenerative disorder and the most common cause of dementia in older adults. It leads to gradual neuronal loss, causing cognitive decline, behavioral changes, and loss of functional independence.Risk Factors and EtiologyThe disease is multifactorial. Age is the strongest risk factor, with prevalence doubling every 5 years after age 65. Genetic factors include mutations in genes such as APP, PSEN1, and PSEN2, which are associated...
Alzheimer Disease ll: Pathophysiology01:23

Alzheimer Disease ll: Pathophysiology

Alzheimer disease involves structural changes in the brain that begin long before symptoms appear. The most distinctive features are extracellular neuritic plaques and intracellular neurofibrillary tangles.Neuritic plaques form in the cerebral cortex and around blood vessels. These plaques contain a dense core of beta-amyloid (Aβ)—a toxic protein fragment that clumps outside neurons. The core is surrounded by damaged neuronal extensions, as well as reactive astrocytes and microglia. Abnormal...
Parkinson Disease ll: Pathophysiology01:24

Parkinson Disease ll: Pathophysiology

Parkinson disease (PD) is a progressive neurodegenerative disorder primarily affecting movement, with additional non-motor features. Its pathophysiology involves complex interactions among genetic susceptibility, environmental exposures, and cellular dysfunction, including dopaminergic neuron loss, protein aggregation, and mitochondrial impairment.Selective NeurodegenerationA key feature is the degeneration of dopaminergic neurons in the substantia nigra pars compacta, leading to reduced...