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Swingler, Tracey E., Niu, Lingzi, Pontifex, Matthew G., Vauzour, David 
ORCID: https://orcid.org/0000-0001-5952-8756 and Clark, Ian M.
(2022)
The microRNA-455 null mouse has memory deficit and increased anxiety, targeting key genes involved in Alzheimer’s disease.
International Journal of Molecular Sciences, 23 (1).
ISSN 1661-6596
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Abstract
The complete molecular mechanisms underlying the pathophysiology of Alzheimer’s disease (AD) remain to be elucidated. Recently, microRNA-455-3p has been identified as a cir-culating biomarker of early AD, with increased expression in post-mortem brain tissue of AD patients. MicroRNA-455-3p also directly targets and down-regulates APP, with the overexpres-sion of miR-455-3p suppressing its toxic effects. Here, we show that miR-455-3p expression de-creases with age in the brains of wild-type mice. We generated a miR-455 null mouse utilising CRISPR-Cas9 to explore its function further. Loss of miR-455 resulted in increased weight gain, potentially indicative of metabolic disturbances. Furthermore, performance on the novel object recognition task diminished significantly in miR-455 null mice (p = 0.004), indicating deficits in recognition memory. A slight increase in anxiety was also captured on the open field test. BACE1 and TAU were identified as new direct targets for miR-455-3p, with overexpression of miR-455-3p leading to a reduction in the expression of APP, BACE1 and TAU in neuroblastoma cells. In the hippocampus of miR-455 null mice at 14 months of age, the levels of protein for APP, BACE1 and TAU were all increased. Such findings reinforce the involvement of miR-455 in AD progression and demonstrate its action on cognitive performance.
| Item Type: | Article |
|---|---|
| Additional Information: | Funding Information: Funding: T.E.S. was funded by a Dunhill Medical Trust Programme grant (number R476/0516); L.N. was funded by Action Arthritis and Funds for Women Graduates (number GA-00842). |
| Uncontrolled Keywords: | app,alzheimer’s disease,anxiety,bace1,knockout,memory,mir-455,microrna,novel object recognition,tau,catalysis,molecular biology,spectroscopy,computer science applications,physical and theoretical chemistry,organic chemistry,inorganic chemistry ,/dk/atira/pure/subjectarea/asjc/1500/1503 |
| Faculty \ School: | Faculty of Science > School of Biological Sciences Faculty of Medicine and Health Sciences > Norwich Medical School |
| Related URLs: | |
| Depositing User: | LivePure Connector |
| Date Deposited: | 04 Jan 2022 14:30 |
| Last Modified: | 22 Oct 2022 16:34 |
| URI: | https://ueaeprints.uea.ac.uk/id/eprint/82881 |
| DOI: | 10.3390/ijms23010554 |
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