Dynamics of heat shock protein 70 kDa in heat-shocked and hypoxic human endothelial cells

Autor(es)

Coimbra, Luiza B. C. T. ; Pinto-Martinez, Andrea ; Pavan, Isadora C. B. ; Melo, Everton G. ; Araujo, Thais L. S.

• Tipo de documento: Artigo Científico
• Fonte: CELL STRESS & CHAPERONES; v. 30, n. 4, p. 16-pg., 2025-07-01.

Resumo

Heat shock proteins (HSPs) play crucial roles in human endothelial cell functions such as migration and angiogenesis. However, human HSP dynamics under stress conditions such as heat shock (HS) and hypoxia in human endothelial cells (ECs) are enigmatic, and the characteristics of HSPs in ECs after exposure to thermal stress and a low-oxygen environment are unknown. We hypothesized that ECs adapt to HS and hypoxia by modulating chaperome oligomerization and that HSP70 is a major determinant of the endothelial phenotype. HSP70 inhibition with VER-155008 or YM-1 in primary human endothelial cells decreases EC proliferation, migration, and angiogenesis at baseline and after heat shock recovery. We showed that vascular-independent HSC/P70 multimeric complexes in primary human veins (HUVEC) and coronary artery ECs (HCAEC) accumulate after HS and are decreased by hypoxia. HS recovery increases the number of HSP90 dimers, inducible HSP70, and HSP40 macromolecular complexes, whereas HSC70 returns to baseline. We demonstrated that the HS response and hypoxia regulate HSPs through a new layer of complexity, oligomerization, in addition to classical cochaperone/NEF interactions. The biphasic temporal oligomerization of molecular chaperones in the recovery phase provides a novel face of the heat shock response. In addition, shifts in the subcellular location and upregulation of HSP70 were also observed here. The decrease in HSP expression caused by hypoxia raises the possibility that decreased chaperone power contributes to the endothelial dysfunction found in atherosclerosis, thrombosis, and cancer. Together, these results show that HSP70 is pivotal to the healthy endothelial response in veins and coronary arteries, and we revealed human HSP dynamics in the vascular response to proteotoxic stress. (AU)

• Processo FAPESP: 19/20435-8 - Proteostase mediada pela chaperona molecular HSP70 em células endoteliais em resposta à força hemodinâmica
• Beneficiário: Thaís Larissa Araujo de Oliveira Silva
• Modalidade de apoio: Bolsas no Brasil - Jovens Pesquisadores
• Processo FAPESP: 20/11249-3 - A fisiopatologia das células endoteliais isoladas de pacientes com tromboembolismo pulmonar hipertensivo: mecanismos regulados por HSP70
• Beneficiário: Luiza Bitencourt de Carvalho Terci Coimbra
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 18/13739-8 - Proteostase mediada pela chaperona molecular HSP70 em células endoteliais em resposta à força hemodinâmica
• Beneficiário: Thaís Larissa Araujo de Oliveira Silva
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 23/06938-2 - Padronização de BONCAT acoplado a PLA em células endoteliais primárias.
• Beneficiário: Isadora Carolina Betim Pavan
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico
• Processo FAPESP: 19/25503-1 - Mecanismo de formação e estabilidade dos complexos macromolecular de Hsp70 e Hsp90 em células endoteliais
• Beneficiário: Everton Gonzaga de Melo
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 24/20224-5 - Padronização de BONCAT acoplado a PLA em células endoteliais primárias.
• Beneficiário: Andrea Katherine Pinto Martinez
• Modalidade de apoio: Bolsas no Brasil - Programa Capacitação - Treinamento Técnico