# What are the antibodies that cause autoimmune encephalitis? Canonical page: https://clinicsjo.com/en/faq/ma-hiya-al-ajsam-al-modaddah-allati-tusabbib-iltihab-ad-dimagh-al-manai-ath-dhati Language: en Category: neurology Publisher: ClinicsJo Published: 2026-09-13T08:09:50.901Z Content updated: 2026-09-13T08:09:50.901Z Translation (ar): https://clinicsjo.com/ar/faq/ma-hiya-al-ajsam-al-modaddah-allati-tusabbib-iltihab-ad-dimagh-al-manai-ath-dhati Autoimmune encephalitis is a group of neurological disorders that arise when the immune system mistakenly attacks specific proteins on the surface of neurons in the brain, rather than protecting them from external agents. This immune attack disrupts normal neural signaling within the brain, leading to a wide range of neurological and psychiatric symptoms that vary depending on the type of antibodies present [\[4\]](). These antibodies are essential biomarkers that help physicians determine the appropriate treatment pathway for the patient. ## Key Antibodies Responsible There is a range of known antibodies that are tested to detect autoimmune encephalitis. This list includes neuronal cell surface receptors and associated proteins, most notably: - **Anti-NMDAR antibodies:** These are glutamate-related receptors and are among the types most strongly associated with cases of autoimmune encephalitis [\[5\]](). - **Anti-AMPAR 1 and 2 antibodies:** These antibodies also target glutamate receptors and are associated with cases of limbic encephalitis and atypical psychosis [\[5\]](). - **Anti-GABAB receptor antibodies:** Their presence is often linked to cases of limbic encephalitis [\[5\]](). - **Antibodies associated with VGKC proteins:** These include specifically LGI1 and CASPR2 proteins, which play a central role in limbic encephalitis and sometimes in neuromuscular conditions such as Morvan syndrome [\[4\]](), [\[5\]](). - **Anti-DPPX antibodies:** These target a subunit of potassium channels, and their presence is often preceded by severe gastrointestinal symptoms, such as diarrhea and weight loss [\[5\]](). ## Laboratory Detection Methodology An accurate diagnostic process requires the detection of these antibodies in both blood serum and cerebrospinal fluid (CSF). Experts emphasize that any positive result appearing in a serum test must always be confirmed via a cerebrospinal fluid test to reduce the risk of misdiagnosis and ensure the accuracy of clinical findings [\[4\]](). Combining clinical assessment, brain imaging, and laboratory detection of these antibodies is the gold standard for diagnosing these complex conditions [\[5\]](). ## Importance of Early Intervention Physicians confirm that initiating treatment early after an accurate diagnosis leads to significant improvement in symptoms for most patients [\[5\]](). Given the progressive nature of the condition, delayed intervention may increase the severity of symptoms and their impact on brain functions. You can read more about this process in our article on [the diagnosis and treatment of autoimmune encephalitis (Arabic)](). ## When Does the Condition Require Emergency Medical Care? In some cases, the symptoms of encephalitis develop rapidly and alarmingly. Immediate medical attention (emergency room) must be sought if acute symptoms appear, such as confusion or severe disorientation, acute behavioral or personality changes, seizures, or the appearance of neurological symptoms such as difficulty speaking, weakness, or visual and auditory hallucinations [\[6\]](). These signs are clinical indicators that require urgent assessment in the hospital to ensure necessary measures are taken and to protect vital brain functions [\[6\]](). ## Medical references - [Autoimmune Encephalitis Antibodies (LGI1, CASPR2, NMDA, DPPX, AMPA1/2, GABA B) - North West London Pathology]() - [Sheffield Laboratory Medicine]() - [Encephalitis - Symptoms - NHS]() General health education; not a substitute for individualized clinical assessment. Citation URL: https://clinicsjo.com/en/faq/ma-hiya-al-ajsam-al-modaddah-allati-tusabbib-iltihab-ad-dimagh-al-manai-ath-dhati#answer