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Peroxisomal Disease Cell Lines with Cellular Plasmalogen Deficiency Have Impaired Muscarinic Cholinergic Signal Transduction Activity and Amyloid Precursor Protein Secretion

https://doi.org/10.1006/bbrc.1998.8909Get rights and content

Abstract

We tested whether alterations in membrane lipid composition associated with peroxisomal diseases affect muscarinic cholinergic signal transduction activity and amyloid precursor protein (APP) secretion in cultured human skin fibroblasts and Chinese hamster ovary (CHO) mutants. We found that in cell lines from patients with peroxisomal disorders where plasmalogen levels were low, the low-Km GTPase activity was not induced by carbachol, and APP secretion was reduced. This effect on signal transduction activity was not associated with decreased levels of the M1-muscarinic cholinergic receptor or its associated heterotrimeric G-protein. Specifically, this decrease was associated with a plasmalogen deficiency since a CHO cell line with only a deficit in plasmalogens was as severely affected as were generalized peroxisomal disorder cell lines. Thus, plasmalogens appear to be implicated in muscarinic cholinergic signal transduction and secretion of APP. These results provide new insights about the pathophysiology of peroxisomal diseases and may be relevant to Alzheimer's disease where reduced plasmalogen levels have been reported.

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