PLD3 is a neuronal lysosomal phospholipase D associated with β-amyloid plaques and cognitive function in Alzheimer’s disease

Autoři: Alex G. Nackenoff aff001;  Timothy J. Hohman aff001;  Sarah M. Neuner aff003;  Carolyn S. Akers aff001;  Nicole C. Weitzel aff001;  Alena Shostak aff001;  Shawn M. Ferguson aff004;  Bret Mobley aff005;  David A. Bennett aff006;  Julie A. Schneider aff006;  Angela L. Jefferson aff001;  Catherine C. Kaczorowski aff003;  Matthew S. Schrag aff001
Působiště autorů: Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America aff001;  Vanderbilt Memory and Alzheimer’s Center, Department of Neurology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America aff002;  The Jackson Laboratory, Bar Harbor, Maine, United States of America aff003;  Department of Cell Biology, Yale University, New Haven, Connecticut, United States of America aff004;  Department of Pathology, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America aff005;  Rush Alzheimer’s Disease Center, Rush University Medical Center, Chicago, Illinois, United States of America aff006
Vyšlo v časopise: PLD3 is a neuronal lysosomal phospholipase D associated with β-amyloid plaques and cognitive function in Alzheimer’s disease. PLoS Genet 17(4): e1009406. doi:10.1371/journal.pgen.1009406
Kategorie: Research Article


Phospholipase D3 (PLD3) is a protein of unclear function that structurally resembles other members of the phospholipase D superfamily. A coding variant in this gene confers increased risk for the development of Alzheimer’s disease (AD), although the magnitude of this effect has been controversial. Because of the potential significance of this obscure protein, we undertook a study to observe its distribution in normal human brain and AD-affected brain, determine whether PLD3 is relevant to memory and cognition in sporadic AD, and to evaluate its molecular function. In human neuropathological samples, PLD3 was primarily found within neurons and colocalized with lysosome markers (LAMP2, progranulin, and cathepsins D and B). This colocalization was also present in AD brain with prominent enrichment on lysosomal accumulations within dystrophic neurites surrounding β-amyloid plaques. This pattern of protein distribution was conserved in mouse brain in wild type and the 5xFAD mouse model of cerebral β-amyloidosis. We discovered PLD3 has phospholipase D activity in lysosomes. A coding variant in PLD3 reported to confer AD risk significantly reduced enzymatic activity compared to wild-type PLD3. PLD3 mRNA levels in the human pre-frontal cortex inversely correlated with β-amyloid pathology severity and rate of cognitive decline in 531 participants enrolled in the Religious Orders Study and Rush Memory and Aging Project. PLD3 levels across genetically diverse BXD mouse strains and strains crossed with 5xFAD mice correlated strongly with learning and memory performance in a fear conditioning task. In summary, this study identified a new functional mammalian phospholipase D isoform which is lysosomal and closely associated with both β-amyloid pathology and cognition.

Klíčová slova:

Alzheimer's disease – Lysosomes – Medical risk factors – Mouse models – Neurites – Phospholipases – Small interfering RNA – Transfection


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