Discovery of a novel cathepsin inhibitor with dual autophagy-inducing and metastasis-inhibiting effects on breast cancer cells.

Abstract:

:Drug resistance and cancer cells metastasis have been the leading causes of chemotherapy failure and cancer-associated death in breast cancer patients. In present, various active molecules either exhibiting novel mechanism of action such as inducing autophagy or inhibiting metastasis have been developed to address these problems. However, the compounds exhibiting such dual functions have rarely been described. Previous work in our group showed that TSA, as a synthetic analog of asperphenamate, induced autophagic cell death in breast cancer cells instead of apoptosis. Furthermore, the target enzyme of TSA was predicted to be cathepin L (Cat L) by natural product consensus pharmacophore strategy. Accumulated evidences have shown that cathepsins are closely associated with migration and invasion of breast cancer cells. It seemed likely that TSA-like molecules may possess the dual functions of inducing autophagy and inhibiting metastasis. Therefore, sixty optically active derivatives were firstly designed and synthesized by replacing the A-ring moiety of TSA with other substituted-phenyl sulfonyl groups. Further cathepsin inhibitory activity assay showed that (S, S) and (S, R) isomers displayed no activity against four kinds of cathepsins (L, S, K, B), while all derivatives tested were inactive toward K and B subtypes. Compound 6a with meta-bromo substituent displayed the greatest inhibitory activity, and its inhibitory capability against Cat L and S was 3.9 and 11.5-fold more potent than that of TSA, respectively. Molecular docking also exhibited that 6a formed more hydrogen bonds or π-π contacts with Cat L or S than TSA. In order to determine whether 6a could play dual roles, its anti-cancer mechanism was further investigated. On the one hand, MDC staining experiment and western blotting analysis validated that 6a can induce autophagy in MDA-MB-231 cells. On the other hand, its metastatic inhibitory ability was also confirmed by wound healing and transwell chamber experiment.

journal_name

Bioorg Chem

journal_title

Bioorganic chemistry

authors

Yuan L,Liu J,He W,Bao Y,Sheng L,Zou C,Hu B,Ge W,Liu Y,Wang J,Lin B,Li Y,Ma E

doi

10.1016/j.bioorg.2018.11.025

subject

Has Abstract

pub_date

2019-03-01 00:00:00

pages

239-253

eissn

0045-2068

issn

1090-2120

pii

S0045-2068(18)31155-6

journal_volume

84

pub_type

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