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Antibody Transfection into Neurons as a Tool to Study Disease Pathogenesis

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Decoding Multiple Antibody Positivity: Lessons from Paraneoplastic Sensory Ataxia.

S Sidharth¹, Ayush Agarwal¹, Divyani Garg¹

¹Department of Neurology, All India Institute of Medical Sciences, New Delhi, India.

Annals of Indian Academy of Neurology

|August 28, 2024

Summary

Paraneoplastic neurologic syndromes are rare immune-mediated conditions linked to cancer. This case highlights a rare sensory neuronopathy with multiple antibody markers, emphasizing diagnostic verification for accurate cancer-associated neurological disorder identification.

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Area of Science:

Neurology
Immunology
Oncology

Background:

Paraneoplastic neurologic syndromes (PNS) are immune-mediated disorders associated with cancer.
They can affect any part of the nervous system and present with diverse neurological features.
Key phenotypes include limbic encephalitis, sensory neuronopathy, and Lambert-Eaton myasthenic syndrome.

Purpose of the Study:

To report a rare case of sensory neuronopathy with multiple paraneoplastic antibody detections.
To emphasize the importance of verifying antibody findings in diagnosing PNS.
To highlight specific clinical signs, like lower facial dyskinesias, that may suggest PNS.

Main Methods:

Clinical case presentation.
Serological and cerebrospinal fluid antibody testing using immunoblot and immunofluorescence.
Review of characteristic neurological phenotypes associated with PNS.

Main Results:

A rare case of sensory neuronopathy was identified.
The patient showed triple antibody positivity (anti-Hu, anti-CRMP5, anti-amphiphysin) on immunoblot.
However, only anti-Hu antibody positivity was confirmed by immunofluorescence, indicating the need for verification.
Lower facial dyskinesias were noted as a potential clinical clue.

Conclusions:

Diagnostic verification of antibody testing is crucial in paraneoplastic neurologic syndromes.
Sensory neuronopathy can present with complex antibody profiles.
Clinical context and specific signs like facial dyskinesias are important for suspecting PNS.