Citation: Ji-Ai HUA, Xue-Man WEI, Na ZHANG, Peng-Ju CHEN, Xiang MA. Synthesis of a Linear Cobalt-Substituted Strandberg-Type Polyphospolybdate with Ability in Modulating Conformation of Aβ-Peptide Misfolding Aggregation[J]. Chinese Journal of Inorganic Chemistry, ;2022, 38(10): 1908-1918. doi: 10.11862/CJIC.2022.207 shu

Synthesis of a Linear Cobalt-Substituted Strandberg-Type Polyphospolybdate with Ability in Modulating Conformation of Aβ-Peptide Misfolding Aggregation

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  • A linear Co-substituted Strandberg-type polyphosphomolybdate (H2en)6{[Co(H2O)4] (P2 Mo5O23)}3·11H2O (abbreviated as CoPM, en=ethylenediamine) has been synthesized and structurally characterized by elemental analyses, IR spectrum, thermogravimetric analysis, and single-crystal X-ray diffraction. Structural analysis reveals that the molecular structural unit of CoPM consists of [P2Mo5O23]6- cluster, and Co-complex [Co(H 2O)4]2+, and they join alternately to form the 1D infinite extension skeleton of CoPM. Furthermore, each cyclic unit of the CoPM chain contains three {[Co(H2O)4](P2Mo5O23)}4- units in solid states based on bond valence sums (BVS) calculation. The intervention of CoPM on the misfolding process of amyloid β-protein (Aβ) was studied by the thioflavin T fluorescence method, turbidimetric method, circular dichroism, and NMR. The results indicate that CoPM can modulate the β-sheet-rich conformation of Aβ aggregates, and thus reduce the formation of toxic species. Moreover, 2', 7'-dichlorofluorescein (DCF) fluorescence and cytotoxicity experiments showed that CoPM could also eliminate reactive oxygen species (ROS) produced by Cu2+-Aβ aggregates. It can inhibit the cytotoxicity of β-sheet-rich species and protect synapses of PC12 cells.
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