Abstract：
:Neuroblastoma (NB) is an extracranial solid cancer and the most common cancer in infancy. Despite the standard treatment for NB is based on the combination of chemotherapeutic drugs such as doxorubicin, vincristine, cyclophosphamide, and cisplatin, chemoresistance occurs over the time. The aim of the present research was to evaluate the effect of bortezomib (BTZ) (50 nM) on NB cell viability and how lipoic acid (ALA) (100 μM) modifies pharmacological response to this chemotherapeutic agent. Cell viability was assessed by ATP luminescence assay whereas expression of oxidative stress marker (i.e., heme oxygenase-1) and endoplasmic reticulum stress proteins was performed by real-time PCR, western blot, and immunofluorescence. Our data showed that BTZ treatment significantly reduced cell viability when compared to untreated cultures (about 40%). Interestingly, ALA significantly reduced the efficacy of BTZ (about 30%). Furthermore, BTZ significantly induced heme oxygenase-1 as a result of increased oxidative stress and such overexpression was prevented by concomitant treatment with ALA. Similarly, ALA significantly reduced BTZ-mediated endoplasmic reticulum stress as measured by reduction in BiP1 and IRE1α, ERO1α, and PDI expression. In conclusion, our data suggest that BTZ efficacy is dependent on cellular redox status and such mechanisms may be responsible of chemoresistance to this chemotherapeutic agent.
journal_name
Mol Neurobioljournal_title
Molecular neurobiologyauthors
Tibullo D,Giallongo C,Puglisi F,Tomassoni D,Camiolo G,Cristaldi M,Brundo MV,Anfuso CD,Lupo G,Stampone T,Li Volti G,Amenta F,Avola R,Bramanti Vdoi
10.1007/s12035-017-0575-6subject
Has Abstractpub_date
2018-04-01 00:00:00pages
3344-3350issue
4eissn
0893-7648issn
1559-1182pii
10.1007/s12035-017-0575-6journal_volume
55pub_type
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