Abstract
Cellular arachidonic acid (AA), an unsaturated fatty acid found ubiquitously in plasma membranes, is metabolized to different prostanoids, such as prostacyclin (PGI2) and prostaglandin E2 (PGE2), by the three-step reactions coupling the upstream cyclooxygenase (COX) isoforms (COX-1 and COX-2) with the corresponding individual downstream synthases. While the vascular actions of these prostanoids are well-characterized, their specific roles in the hippocampus, a major brain area for memory, are poorly understood. The major obstacle for its understanding in the brain was to mimic the biosynthesis of each prostanoid. To solve the problem, we utilized Single-Chain Hybrid Enzyme Complexes (SCHECs), which could successfully control cellular AA metabolites to the desired PGI2 or PGE2. Our in vitro studies suggested that neurons with higher PGI2 content and lower PGE2 content exhibited survival protection and resistance to Amyloid-β-induced neurotoxicity. Further extending to an in vivo model, the hybrid of PGI2-producing transgenic mice and Alzheimer’s disease (AD) mice showed restored long-term memory. These findings suggested that the vascular prostanoids, PGI2 and PGE2, exerted significant regulatory influences on neuronal protection (by PGI2), or damage (by PGE2) in the hippocampus, and raised a concern that the wide uses of aspirin in cardiovascular diseases may exert negative impacts on neurodegenerative protection.
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Acknowledgements
We thank Dr. Samina Salim for giving us HT22 cells. We would also like to thank Dr. Min Hu and Dr. Wei-qun Wang for helping us on generating LC/MS/MS data.
Funding
This work was supported by NIH Grants (RO1 HL56712 and HL79389 for KHR) and American Heart Association grants (10GRNT4470042 and 14GRNT20380687 for KHR).
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Q-L.L. performed the experiments, analyzed the data, and prepared the Figures. H.A. helped generating the mice. C.C. helped on performing the experiments and revising the manuscript. C.H. and K.W. provided behavioral facility, and helped design, set up, and extract data of the behavioral experiments. Q-L.L. and K-H.R. designed the experiments. Q-L.L. and K-H.R. wrote the manuscript. All authors read and approved the final manuscript.
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Ling, QL., Akasaka, H., Chen, C. et al. The Protective Effects of Up-Regulating Prostacyclin Biosynthesis on Neuron Survival in Hippocampus. J Neuroimmune Pharmacol 15, 292–308 (2020). https://doi.org/10.1007/s11481-019-09896-5
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DOI: https://doi.org/10.1007/s11481-019-09896-5