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The distribution of the P2X family of ATP receptors was analyzed in a rat model for amyotrophic lateral sclerosis (ALS) expressing mutated human superoxide dismutase (mSOD1(G93A)). We showed that strong P2X(4) immunoreactivity was selectively associated with degenerating motoneurons (MNs) in spinal cord ventral horn. Degenerating P2X(4)-positive MNs did not display apoptotic features such as chromatin condensation, positive TUNEL reaction, or active caspase 3 immunostaining. In contrast, these neurons showed other signs of abnormality, such as loss of the neuronal marker NeuN and recruitment of microglial cells with neuronophagic activity. Similar changes were observed in MNs from the cerebral cortex and brainstem in mSOD1(G93A) in both rat and mice. In addition, P2X(4) immunostaining demonstrated the existence of neuronal degeneration in the locus coeruleus, reticular formation, and Purkinje cells of the cerebellar cortex. It is suggested that abnormal trafficking and proteolytic processing of the P2X(4) receptor protein may underlie these changes.
Pubmed ID: 17990272 RIS Download
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