A Rare Case of PMNS Triggered by Cerebral Malaria & The Role of Anti-Septins Antibodies

A recent case study reported an unusual presentation of Primary Myxedema Syndrome (PMNS), where a patient exhibited symptoms suggestive of autoimmune encephalitis linked to anti-septin complex antibodies. This case sheds light on the potential role of these antibodies in the development of PMNS, particularly in the context of severe cerebral malaria.

Classic PMNS with a Unique Trigger

PMNS is typically known as a condition characterized by rapid, severe symptoms, often termed the “foudroyant course.” This patient’s case vividly illustrated this characteristic, emphasizing the autoimmune nature of the disease and the urgent need for immunosuppressive therapy. Discontinuation of methylprednisolone, a corticosteroid medication, led to a swift relapse, highlighting the criticality of sustained treatment for managing PMNS.

Anti-Septins: A Potential New Player in PMNS?

While previous research has linked antibodies against septin-5 to autoimmune encephalitis and cerebellar ataxia, this case represents the first instance of PMNS associated with anti-septin complex antibodies. Septin proteins are crucial components of the cytoskeleton and play vital roles in cell division and intracellular transport. It remains unclear whether these antibodies triggered the autoimmune response directly or were a consequence of inflammation stemming from cerebral malaria.

Cerebral Malaria: A Potential Trigger for Autoimmunity?

The patient’s history of severe cerebral malaria raises intriguing questions. Though septin genes are not found in malaria parasites, it’s conceivable that molecular mimicry, where the immune system mistakenly attacks self-proteins resembling parasite antigens, could have occurred. However, more research is needed to fully understand the role of malaria infections in triggering PMNS through this mechanism.

Diagnosing Autoimmune Encephalitis: A Multifaceted Approach

Diagnosing autoimmune encephalitis involves a comprehensive evaluation, including clinical presentation, cerebrospinal fluid analysis, radiological findings, and electroencephalography (EEG) results. Anti-body status and response to treatment are not considered initial diagnostic criteria. While the presence of antibodies in the CSF is often considered a hallmark of autoimmune encephalitis, this is not universally required.

This rare case highlights the importance of a vigilant approach to diagnosing autoimmune encephalitis, particularly in individuals with a history of infections like cerebral malaria. Further research is essential to unravel the complex interplay between infections, immune responses, and the development of PMNS.

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