Abstract
Cathepsin D (Cat D) is a lysosomal aspartic acid protease encoded by CTSD gene and has significant biological roles such as degradation of extracellular and intracellular proteins, regulation of apoptosis, hormone processing, antigen processing etc. Furthermore, it is overexpressed by breast cancer cells and it acts a role in many processes affecting the cancer prognosis such as metastasis, angiogenesis, invasion, and drug resistance through regulation of the metabolic pathways and digesting the extracellular matrix (ECM) proteins. Due to that there is no drug targeting Cat D in clinical trial phases, a virtual drug screening in order to reveal possible drugs with high Cat D inhibitory activity from a library composed of 12,111 ligands is carried out with this study. Results have demonstrated that ZINC000003922429 (Adozelesin), ZINC000012358610 (Phthalocyanine), ZINC000051951669 (Bemcentinib), ZINC000003786250 (YM022), and ZINC000150338819 (Ledipasvir) have high binding affinity to Cat D. Among these chemical ligands, YM022 from Drugs in Clinical Trials dataset has been evaluated as most promising one that might be repurposed in the treatment of breast cancer due to its high affinity, convenient ADME and Toxicity properties, and highest bioactivity profiles. However, the possible activity of YM022 should be analyzed with further molecular dynamics (MD) simulations, in vitro and in vivo studies.
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