AQP4
Aquaporin-4
Plain-language definition
A water channel protein in the brain and spinal cord. Antibodies against AQP4 are the hallmark of NMO and help distinguish it from MS.
Expanded explanation
AQP4 is the glossary term for Aquaporin-4. On a full article page, it should be read as a immune system term term, not as a stand-alone diagnosis or treatment plan.
Immunology terms point to antibodies, inflammation, immune pathways, or autoimmune disease. They often matter because immune activity can affect the eye directly or connect an eye finding with a broader systemic condition.
In eye care context
Immunology terms describe immune-system activity, antibodies, inflammation, or autoimmune processes that can affect the eyes and nerves.
What to look for around this term
- Whether the term describes an antibody, immune pathway, inflammatory pattern, or immune-modulating treatment.
- Whether the article is discussing relapse risk, systemic disease, lab testing, or treatment decisions.
- Which specialists may be involved, such as ophthalmology, neurology, rheumatology, or immunology.
Questions this term may raise
- Does this suggest autoimmune disease?
- Is blood testing or imaging part of the evaluation?
- Does treatment need coordination with another specialist?
- Category
- Immune system term
- Also written as
- No alternate forms listed.
Related glossary terms
- autoimmune
Self-Attacking Immune Response
- complement
Immune Defense Cascade
- immunocompromised
Weakened Immune System
- immunomodulator
Immune System Adjuster
- immunosuppressive
Immune System Suppression
- immunotherapy
Immune-Based Treatment
A note on medical context
A glossary definition can explain a word, but it cannot tell you whether a symptom or test result is serious. If this term came from an article, use the full article and your clinician's guidance for context.