Apolipoprotein E4 disrupts the neuroprotective action of sortilin in neuronal lipid metabolism and endocannabinoid signaling.
INTRODUCTION
Apolipoprotein E (apoE) is a carrier for brain lipids and the most important genetic risk factor for Alzheimer's disease (AD). ApoE binds the receptor sortilin, which mediates uptake of apoE-bound cargo into neurons. The significance of this uptake route for brain lipid homeostasis and AD risk seen with apoE4, but not apoE3, remains unresolved.


METHODS
Combining neurolipidomics in patient specimens with functional studies in mouse models, we interrogated apoE isoform-specific functions for sortilin in brain lipid metabolism and AD.


RESULTS
Sortilin directs the uptake and conversion of polyunsaturated fatty acids into endocannabinoids, lipid-based neurotransmitters that act through nuclear receptors to sustain neuroprotective gene expression in the brain. This sortilin function requires apoE3, but is disrupted by binding of apoE4, compromising neuronal endocannabinoid metabolism and action.


DISCUSSION
We uncovered the significance of neuronal apoE receptor sortilin in facilitating neuroprotective actions of brain lipids, and its relevance for AD risk seen with apoE4.
['Asaro|Antonino|A|', 'Carlo-Spiewok|Anne-Sophie|AS|', 'Malik|Anna R|AR|', 'Rothe|Michael|M|', 'Schipke|Carola G|CG|', 'Peters|Oliver|O|', 'Heeren|Joerg|J|', 'Willnow|Thomas E|TE|']
D033942:Adaptor Proteins, Vesicular Transport D000544:Alzheimer Disease D000818:Animals D053318:Apolipoprotein E3 D053327:Apolipoprotein E4 D001692:Biological Transport D001921:Brain D063388:Endocannabinoids D006801:Humans D050356:Lipid Metabolism D051379:Mice D009474:Neurons D000066829:Neuroprotection D015398:Signal Transduction
endocannabinoids apolipoprotein E Alzheimer's disease polyunsaturated fatty acids DHA VPS10P domain receptors brain lipoprotein metabolism lipoprotein receptors