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During early AD pathogenesis, one of the first areas of degeneration is the locus coeruleus (LC), which provides broad innervation of the central nervous system and facilitates norepinephrine (NE) transmission. Though the LC-NE is likely to influence microglial dynamics, it is unclear how these systems change with AD compared to otherwise healthy aging.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>In this study, we evaluated the dynamic changes of neuroinflammation and neurodegeneration in the LC-NE system in the brain and spinal cord of APP\/PS1 mice and aged WT mice using immunofluorescence and ELISA.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Our results demonstrated increased expression of inflammatory cytokines and microglial activation observed in the cortex, hippocampus, and spinal cord of APP\/PS1 compared to WT mice. LC-NE neuron and fiber loss as well as reduced norepinephrine transporter (NET) expression was more evident in APP\/PS1 mice, although NE levels were similar between 12-month-old APP\/PS1 and WT mice. Notably, the degree of microglial activation, LC-NE nerve fiber loss, and NET reduction in the brain and spinal cord were more severe in 12-month-old APP\/PS1 compared to 12- and 24-month-old WT mice.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusion<\/jats:title>\n                <jats:p>These results suggest that elevated neuroinflammation and microglial activation in the brain and spinal cord of APP\/PS1 mice correlate with significant degeneration of the LC-NE system.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12974-020-02054-2","type":"journal-article","created":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T14:08:54Z","timestamp":1609942134000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":73,"title":["Comparisons of neuroinflammation, microglial activation, and degeneration of the locus coeruleus-norepinephrine system in APP\/PS1 and aging mice"],"prefix":"10.1186","volume":"18","author":[{"given":"Song","family":"Cao","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Daniel W.","family":"Fisher","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Guadalupe","family":"Rodriguez","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tian","family":"Yu","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongxin","family":"Dong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,1,6]]},"reference":[{"key":"2054_CR1","doi-asserted-by":"publisher","first-page":"36","DOI":"10.1016\/j.neulet.2019.03.050","volume":"704","author":"S Chakraborty","year":"2019","unstructured":"Chakraborty S, Lennon JC, Malkaram SA, Zeng Y, Fisher DW, Dong H. 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