RESUMO
Heat shock protein 90α (HSP90α) maintains cell stabilization and regulates cell death, respectively. Recent studies have shown that HSP90α is involved in receptor interacting protein 3 (RIP3)-mediated necroptosis in HT29 cells. It is known that oxygen and glucose deprivation (OGD) can induce necroptosis, which is regulated by RIP3 in neurons. However, it is still unclear whether HSP90α participates in the process of OGD-induced necroptosis in cultured neurons via the regulation of RIP3. Our study found that necroptosis occurs in primary cultured cortical neurons and PC-12 cells following exposure to OGD insult. Additionally, the expression of RIP3/p-RIP3, MLKL/p-MLKL, and the RIP1/RIP3 complex (necrosome) significantly increased following OGD, as measured through immunofluorescence (IF) staining, Western blotting (WB), and immunoprecipitation (IP) assay. Additionally, data from computer simulations and IP assays showed that HSP90α interacts with RIP3. In addition, HSP90α was overexpressed following OGD in cultured neurons, as measured through WB and IF staining. Inhibition of HSP90α in cultured neurons, using the specific inhibitor, geldanamycin (GA), and siRNA/shRNA of HSP90α, protected cultured neurons from necrosis. Our study showed that the inhibitor of HSP90α, GA, rescued cultured neurons not only by decreasing the expression of total RIP3/MLKL, but also by decreasing the expression of p-RIP3/p-MLKL and the RIP1/RIP3 necrosome. In this study, we reveal that inhibition of HSP90α protects primary cultured cortical neurons and PC-12 cells from OGD-induced necroptosis through the modulation of RIP3 expression.
Assuntos
Apoptose/efeitos dos fármacos , Benzoquinonas/farmacologia , Córtex Cerebral/efeitos dos fármacos , Glucose/deficiência , Proteínas de Choque Térmico HSP90/antagonistas & inibidores , Lactamas Macrocíclicas/farmacologia , Neurônios/efeitos dos fármacos , Fármacos Neuroprotetores/farmacologia , Proteína Serina-Treonina Quinases de Interação com Receptores/metabolismo , Animais , Hipóxia Celular , Córtex Cerebral/embriologia , Córtex Cerebral/enzimologia , Córtex Cerebral/patologia , Regulação para Baixo , Feminino , Idade Gestacional , Proteínas de Choque Térmico HSP90/genética , Proteínas de Choque Térmico HSP90/metabolismo , Necrose , Neurônios/enzimologia , Neurônios/patologia , Células PC12 , Gravidez , Cultura Primária de Células , Ligação Proteica , Proteínas Quinases/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Interferência de RNA , RNA Interferente Pequeno/genética , RNA Interferente Pequeno/metabolismo , Ratos , Ratos Sprague-Dawley , Transdução de Sinais/efeitos dos fármacosRESUMO
Necroptosis is programmed necrosis, a process which has been studied for over a decade. The most common accepted mechanism is through the RIP1-RIP3-MLKL axis to regulate necroptotic cell death. As a result of previous studies on necroptosis, positive regulation for promoting necroptosis such as HSP90 stabilization and hyperactivation of TAK1 on RIP1 is clear. Similarly, the negative regulation of necroptosis, such as through caspase 8, c-FLIP, CHIP, MK2, PELI1, ABIN-1, is also clear. Therefore, the promise of corresponding applications in treating diseases becomes hopeful. Studies have shown that necroptosis is involved in the development of many diseases, such as ischemic injury diseases in various organs, neurodegenerative diseases, infectious diseases, and cancer. Given these results, drugs that inhibit or trigger necroptosis can be discovered to treat diseases. In this review, we briefly introduce up to date concepts concerning the mechanism of necroptosis, the diseases that involve necroptosis, and the drugs that can be applied to treat such diseases.