Summary
Activated microglia and astrocytes release cytokines that contribute to neurological disease.
In depth
Microglia sense damage, release cytokines (IL-1β, TNF), and prune synapses; chronic activation accelerates neurodegeneration. Astrocyte reactivity changes. Peripheral inflammation can influence the brain.
Chronic microglial activation harms neurons. Systemic infection can trigger brain inflammation. Anti-inflammatory strategies are under study.
Remember: the brain has its own immune system.
The brain was once thought immune-privileged, but it has resident immune cells (microglia and perivascular macrophages), meningeal lymphatics and a glymphatic system. Acute inflammation after injury is protective, but chronic activation is harmful. In Alzheimer disease, microglia surround plaques, and variants in TREM2 and CD33 raise risk. Complement-mediated synapse pruning by microglia is excessive in some models. Reactive astrocytes (A1 type) can be toxic, and systemic infection and gut-derived signals feed in.
Neuroinflammation features in multiple sclerosis, stroke, traumatic brain injury, depression (higher cytokines), and long COVID. Therapeutic targets include inflammasome inhibitors, TNF blockers, CSF1R inhibitors and anti-inflammatory lifestyle approaches. Sickness behaviour (fatigue, loss of appetite) is a brain response to peripheral cytokines.
Example: after a head injury, microglia stay activated for years, which may add to long-term degeneration.
Frequently asked questions
What is Neuroinflammation?
Activated microglia and astrocytes release cytokines that contribute to neurological disease.
Which area of biology covers Neuroinflammation, and how advanced is it?
Neuroinflammation is one of the 54 topics in Neuroscience. It is rated Advanced, so it suits learners who want specialist depth. Related topics in this area include Glial Cells, Blood-Brain Barrier, Neurogenesis.
Can you give an example of Neuroinflammation?
Microglia are implicated in Alzheimer's risk genes like TREM2.
What should I learn before Neuroinflammation?
Work through the Beginner topics in Neuroscience first, such as Nervous System, Neuron, Central and Peripheral Nervous Systems, then return to Neuroinflammation. Advanced topics assume the Intermediate vocabulary.
What topics are related to Neuroinflammation?
The closest topics to Neuroinflammation are Glial Cells, Blood-Brain Barrier, Neurogenesis, Neurodegenerative Diseases. Comparing them side by side is a good way to see how the ideas connect.
How can I check that I understand Neuroinflammation?
Read the summary and the in-depth section, then use the quick check on the interactive lesson for Neuroinflammation. To practise the whole of Neuroscience, use the Neuroscience quiz.
How is Neuroinflammation different from Glial Cells?
Neuroinflammation: Activated microglia and astrocytes release cytokines that contribute to neurological disease. Glial Cells: Support cells such as astrocytes and oligodendrocytes that nourish, insulate and protect neurons. Read both side by side and note what each one explains.
How should I study Neuroinflammation step by step?
First, read the summary and write the definition in your own words. Second, read the in-depth section and note any example. Third, compare it with Glial Cells and explain the difference aloud. Finally, take the Neuroscience quiz and come back to this page for any question you miss.