title: Serum Amyloid P Component Ameliorates Neurological Damage Caused by Expressing a Lysozyme Variant in the Central Nervous System of Drosophila melanogaster.
abstract: Lysozyme amyloidosis is a hereditary disease in which mutations in the gene coding for lysozyme leads to misfolding and consequently accumulation of amyloid material. To improve understanding of the processes involved we expressed human wild type (WT) lysozyme and the disease-associated variant F57I in the central nervous system (CNS) of a Drosophila melanogaster model of lysozyme amyloidosis, with and without co-expression of serum amyloid p component (SAP). SAP is known to be a universal constituent of amyloid deposits and to associate with lysozyme fibrils. There are clear indications that SAP may play an important role in lysozyme amyloidosis, which requires further elucidation. We found that flies expressing the amyloidogenic variant F57I in the CNS have a shorter lifespan than flies expressing WT lysozyme. We also identified apoptotic cells in the brains of F57I flies demonstrating that the flies' neurological functions are impaired when F57I is expressed in the nerve cells. However, co-expression of SAP in the CNS prevented cell death and restored the F57I flies' lifespan. Thus, SAP has the apparent ability to protect nerve cells from damage caused by F57I. Furthermore, it was found that co-expression of SAP prevented accumulation of insoluble forms of lysozyme in both WT- and F57I-expressing flies. Our findings suggest that the F57I mutation affects the aggregation process of lysozyme resulting in the formation of cytotoxic species and that SAP is able to prevent cell death in the F57I flies by preventing accumulation of toxic F57I structures.
authors.affiliation: Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden.
authors.forename: Linda
authors.initials: L
authors.lastname: Helmfors
authors.affiliation: Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden.
authors.forename: Liza
authors.initials: L
authors.lastname: Bergkvist
authors.affiliation: Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Linköping, Sweden.
authors.forename: Ann-Christin
authors.identifier: http://orcid.org/0000-0001-7651-3556
authors.initials: AC
authors.lastname: Brorsson
mesh_terms: D000686:Amyloidosis / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D000818:Animals; D030801:Animals, Genetically Modified; D017209:Apoptosis; D002490:Central Nervous System / Q000378:metabolism* / Q000473:pathology; D004195:Disease Models, Animal; D004331:Drosophila melanogaster / Q000235:genetics / Q000378:metabolism; D015870:Gene Expression; D006801:Humans; D008136:Longevity / Q000235:genetics; D009113:Muramidase / Q000235:genetics* / Q000378:metabolism; D009154:Mutation; D009474:Neurons / Q000378:metabolism / Q000473:pathology; D058225:Plaque, Amyloid / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D065840:Protective Factors; D066263:Protein Aggregation, Pathological / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000517:prevention & control; D000683:Serum Amyloid P-Component / Q000235:genetics* / Q000378:metabolism; D019076:Transgenes
chemical_list: D000683:Serum Amyloid P-Component; D009113:Muramidase