Abstract
High potency pyrazole-based noncovalent inhibitors of human cathepsin S (CatS) were developed by modification of the benzo-fused 5-membered ring heterocycles found in earlier series of CatS inhibitors. Although substitutions on this heterocyclic framework had a moderate impact on enzymatic potency, dramatic effects on cellular activity were observed. Optimization afforded indole- and benzothiophene-derived analogues that were high affinity CatS inhibitors (IC(50)=20-40 nM) with good cellular potency (IC(50)=30-340 nM).
MeSH terms
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Animals
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Aza Compounds / chemical synthesis
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Aza Compounds / chemistry
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Aza Compounds / pharmacology
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Benzofurans / chemical synthesis
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Benzofurans / chemistry
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Benzofurans / pharmacology
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Carboxylic Acids / chemical synthesis
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Carboxylic Acids / chemistry
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Carboxylic Acids / pharmacology
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Cathepsins / antagonists & inhibitors*
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Cathepsins / metabolism*
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Humans
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Indoles / chemical synthesis
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Indoles / chemistry
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Indoles / pharmacology
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Molecular Structure
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Protease Inhibitors / chemical synthesis*
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Protease Inhibitors / chemistry
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Protease Inhibitors / pharmacology*
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Pyrazoles / chemical synthesis
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Pyrazoles / chemistry*
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Pyrazoles / pharmacology*
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Structure-Activity Relationship
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Thiophenes / chemical synthesis
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Thiophenes / chemistry
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Thiophenes / pharmacology
Substances
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Aza Compounds
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Benzofurans
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Carboxylic Acids
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Indoles
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Protease Inhibitors
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Pyrazoles
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Thiophenes
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pyrazole
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Cathepsins
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cathepsin S
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benzofuran