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• W2620789908 abstract "Summary Background The absence of transthyretin ( TTR ) in AD mice decreases brain Aβ clearance and reduces the low‐density lipoprotein receptor‐related protein 1 ( LRP 1). It is possible that neuroprotection by TTR is dependent on its tetramer structural stability, as studies using TTR mutants showed that unstable L55P TTR has low affinity for Aβ, and TTR tetrameric stabilizers such as iododiflunisal ameliorate AD features in vivo. Methods We firstly investigated TTR folding status in human plasma measuring the resistance to urea denaturation. The importance of TTR stability on Aβ internalization was studied in human cerebral microvascular endothelial ( hCMEC /D3) and hepatoma cells (HepG2), by flow cytometry. To investigate the fate of Aβ at the blood–brain barrier, Aβ efflux from hCMEC /D3 cells seeded on transwells was measured using ELISA . Further, to assess Aβ colocalization with lysosomes, Lysotracker was used. Moreover, levels of LRP 1 were assessed in the liver and plasma of mice with different TTR backgrounds or treated with iododiflunisal. Results We showed that TTR stability is decreased in AD and that WT TTR and drug‐stabilized L55P TTR are able to increase uptake of Aβ. Furthermore, measurement of Aβ efflux showed that stable or stabilized TTR increased Aβ efflux from the basolateral to the apical side. Moreover, HepG2 cells incubated with Aβ in the presence of WT TTR , but not L55P TTR , showed an increased number of lysosomes. Further, in the presence of WT TTR , Aβ peptide colocalized with lysosomes, indicating that only stable TTR assists Aβ internalization, leading to its degradation. Finally, we demonstrated that only stable TTR can increase LRP 1 levels. Conclusion TTR stabilization exerts a positive effect on Aβ clearance and LRP 1 levels, suggesting that TTR protective role in AD is dependent on its stability. These results provide relevant information for the design of TTR ‐based therapeutic strategies for AD ." @default.
• W2620789908 created "2017-06-09" @default.
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• W2620789908 date "2017-06-01" @default.
• W2620789908 modified "2023-10-01" @default.
• W2620789908 title "Transthyretin stability is critical in assisting beta amyloid clearance- Relevance of transthyretin stabilization in Alzheimer's disease" @default.
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• W2620789908 doi "https://doi.org/10.1111/cns.12707" @default.
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