Inhibition of the Human Hsc70 System by Small Ligands as a Potential Anticancer Approach
Dublang, Leire (Universidad del País Vasco. Departamento de Bioquímica y Biología Molecular)
Underhaug, Jarl (University of Bergen. Department of Chemistry)
Flydal, Marte I. (University of Bergen. Department of Biomedicine)
Velasco-Carneros, Lorea (Universidad del País Vasco. Departamento de Bioquímica y Biología Molecular)
Maréchal, Jean-Didier (Universitat Autònoma de Barcelona. Departament de Química)
Moro, Fernando (Universidad del País Vasco. Departamento de Bioquímica y Biología Molecular)
Boyano, Maria Dolores (Instituto de Investigación Sanitaria Biocruces Bizkaia)
Martinez, Aurora (University of Bergen. Department of Biomedicine)
Muga, Arturo (Universidad del País Vasco. Departamento de Bioquímica y Biología Molecular)

Date:	2021
Abstract:	High levels of Heat shock proteins (Hsps) in specific cancers are usually linked to a poor prognosis, tumor progression, invasiveness, and resistance to treatment. Chaperone inhibition could therefore be toxic for cancer cells due to their high dependence on chaperone activity to survive. This study shows the potential to repurpose the small chemical compound pinaverium bromide, currently used to treat functional gastrointestinal disorders, as a possible antitumor drug since it displays a marked toxicity against two melanoma cell lines without affecting the viability of fibroblast and primary melanocytes. This compound interacts with structural regions shared by representatives of the Hsp70 and Hsp110 families, inhibiting the substrate remodeling ability of the Hsp70 system in vitro and in a cellular context. Heat shock protein (Hsp) synthesis is upregulated in a wide range of cancers to provide the appropriate environment for tumor progression. The Hsp110 and Hsp70 families have been associated to cancer cell survival and resistance to chemotherapy. In this study, we explore the strategy of drug repurposing to find new Hsp70 and Hsp110 inhibitors that display toxicity against melanoma cancer cells. We found that the hits discovered using Apg2, a human representative of the Hsp110 family, as the initial target bind also to structural regions present in members of the Hsp70 family, and therefore inhibit the remodeling activity of the Hsp70 system. One of these compounds, the spasmolytic agent pinaverium bromide used for functional gastrointestinal disorders, inhibits the intracellular chaperone activity of the Hsp70 system and elicits its cytotoxic activity specifically in two melanoma cell lines by activating apoptosis. Docking and molecular dynamics simulations indicate that this compound interacts with regions located in the nucleotide-binding domain and the linker of the chaperones, modulating their ATPase activity. Thus, repurposing of pinaverium bromide for cancer treatment appears as a promising novel therapeutic approach.
Grants:	Ministerio de Economía y Competitividad BFU2016-75983-P Ministerio de Economía y Competitividad PID2019-111068GB-100 Ministerio de Educación, Cultura y Deporte FPU15/01920
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Language:	Anglès
Document:	Article ; recerca ; Versió publicada
Subject:	Chaperones ; Drug repurposing ; Inhibitors ; Melanoma ; Pinaverium bromide
Published in:	Cancers, Vol. 13, Issue 12 (June 2021) , art. 2936, ISSN 2072-6694

DOI: 10.3390/cancers13122936
PMID: 34208232

24 p, 4.6 MB

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