Synthesis, monoamine oxidase inhibitory activity and computational study of novel isoxazole derivatives as potential antiparkinson agents.

Abstract:

:Monoamine oxidase (MAO) enzymes are one of the most promising targets for the treatment of neurological disorders. A series of phenylisoxazole carbohydrazides was designed, synthesized and screened for both MAO-A and MAO-B inhibition using Amplex Red assays. None of the compounds inhibited the MAO-A activity while most of them significantly inhibited MAO-B in the micromolar to nanomolar range. Among them, the compound N'-(4-methylbenzylidene)-5-phenylisoxazole-3-carbohydrazide (6c) exhibited the most potent inhibitory activity towards MAO-B. Enzyme kinetic studies revealed the reversible and competitive nature of compound 6c towards MAO-B inhibition. The results of the enzyme inhibition assay were in agreement with molecular docking study, in which compound 6c displayed a strong binding affinity for MAO-B with a docking score of -10.98 Kcal/mol. In order to explore the neuroprotective effect of compound 6c, MPTP-induced mouse model for Parkinson's disease was used, and motor behavioural assessment of experimental animals was carried out. The compound 6c was able to significantly prevent the MPTP-induced neurotoxicity as revealed by improvement in gait behaviour in footprint test and increase in grip strength score in horizontal wire test. Thus, phenylisoxazole carbohydrazides can be promising leads in the development of potent, selective and reversible MAO-B inhibitors for the treatment of Parkinson's disease.

journal_name

Comput Biol Chem

authors

Agrawal N,Mishra P

doi

10.1016/j.compbiolchem.2019.01.012

subject

Has Abstract

pub_date

2019-04-01 00:00:00

pages

63-72

eissn

1476-9271

issn

1476-928X

pii

S1476-9271(18)30857-0

journal_volume

79

pub_type

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