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Selectivity analyses of ?-benzylidene digoxin derivatives to different Na,K-ATPase ? isoforms: a molecular docking approach.


ABSTRACT: Digoxin and other cardiotonic steroids (CTS) exert their effect by inhibiting Na,K-ATPase (NKA) activity. CTS bind to the various NKA isoforms that are expressed in different cell types, which gives CTS their narrow therapeutic index. We have synthesised a series of digoxin derivatives (?-Benzylidene digoxin derivatives) with substitutions in the lactone ring (including non-oxygen and ether groups), to obtain CTS with better NKA isoform specificity. Some of these derivatives show some NKA isoform selective effects, with BD-3, BD-8, and BD-13 increasing NKA ?2 activity, BD-5 inhibiting NKA ?1 and NKA ?3, BD-10 reducing NKA ?1, but stimulating NKA ?2 and ?3; and BD-14, BD-15, and BD-16 enhancing NKA ?3 activity. A molecular-docking approach favoured NKA isoform specific interactions for the compounds that supported their observed activity. These results show that BD compounds are a new type of CTS with the capacity to target NKA activity in an isoform-specific manner.

SUBMITTER: Pessoa MTC 

PROVIDER: S-EPMC6009882 | biostudies-literature | 2018 Dec

REPOSITORIES: biostudies-literature

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Selectivity analyses of γ-benzylidene digoxin derivatives to different Na,K-ATPase α isoforms: a molecular docking approach.

Pessôa Marco T C MTC   Alves Silmara L G SLG   Taranto Alex G AG   Villar José A F P JAFP   Blanco Gustavo G   Barbosa Leandro A LA  

Journal of enzyme inhibition and medicinal chemistry 20181201 1


Digoxin and other cardiotonic steroids (CTS) exert their effect by inhibiting Na,K-ATPase (NKA) activity. CTS bind to the various NKA isoforms that are expressed in different cell types, which gives CTS their narrow therapeutic index. We have synthesised a series of digoxin derivatives (γ-Benzylidene digoxin derivatives) with substitutions in the lactone ring (including non-oxygen and ether groups), to obtain CTS with better NKA isoform specificity. Some of these derivatives show some NKA isofor  ...[more]

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