Alpha-synuclein pathology of the spinal and peripheral autonomic nervous system in neurologically unimpaired elderly subjects

Neuropathology and Applied Neurobiology
A BlochM Tolnay

Abstract

Studies on cases with incidental Lewy body disease (ILBD) suggest that alpha-synuclein (alphaSN) pathology of Parkinson's disease (PD) starts in lower brainstem nuclei and in the olfactory bulb. However, medullary structures as the induction site of alphaSN pathology have been questioned as large parts of the nervous system, including the spinal cord and the peripheral autonomic nervous system (PANS), have not been examined in ILBD. Thus, the time course of PD lesions in the spinal cord or PANS in relation to medullary lesions remains unknown. We collected 98 post mortem cases with no reference to PD-associated symptoms on clinical records. alphaSN pathology was found in the central nervous system, including the spinal cord, and in the PANS in 17 (17.3%) cases. alphaSN pathology was encountered in autonomic nuclei of the thoracic spinal cord, brainstem and olfactory nerves in 17/17, in sacral parasympathetic nuclei in 15/16, in the myenteric plexus of oesophagus in 14/17, in sympathetic ganglia in 14/17, and in the vagus nerve in 12/16 cases. In addition to the thoracic lateral horns, a high number of alphaSN lesions was also found in non-autonomic spinal cord nuclei. Considering supraspinal structures our cases corresponded ro...Continue Reading

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