V8 induces apoptosis and the endoplasmic reticulum stress response in human multiple myeloma RPMI 8226 cells via the PERK‑eIF2α‑ATF4 signaling pathway

  • Authors:
    • Yaping Zhong
    • Yonggang Zhang
    • Ping Wang
    • Hongxiu Gao
    • Chunling Xu
    • Hui Li
  • View Affiliations

  • Published online on: August 12, 2016     https://doi.org/10.3892/ol.2016.5005
  • Pages: 2702-2709
Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )
Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )


Abstract

Multiple myeloma (MM) is a fatal hematological cancer characterized by clonal plasma cell proliferation in the bone marrow. MM has an increasing global incidence and a poor prognosis. There are limited treatment options available for MM, and this is further compounded by the development of drug resistance. The present study demonstrated that 7‑{4‑[Bis‑(2‑hydroxyethyl)-amino]-butoxy}-5-hydroxy-8-methoxy-2-phenylchromen‑4‑one (V8), a novel synthetic flavonoid, induced apoptosis in human MM RPMI 8226 cells in a dose‑ and time‑dependent manner, using cell viability assays and flow cytometry. Subsequently, V8‑induced apoptosis in RPMI 8226 cells was revealed to occur via mitochondria‑mediated pathways. The activity of caspase‑3, ‑8 and ‑9, and the mRNA level of B‑cell lymphoma 2 (Bcl‑2) and B‑cell lymphoma‑extra large were greatly increased, while the expression of Bcl‑2‑like protein 4 and BH3 interacting domain death agonist was significantly decreased in RPMI 8226 cells following V8 treatment, as observed using quantitative polymerase chain reaction (qPCR). In addition, western blotting revealed that the release of mitochondrial cytochrome c into the cytosol was promoted by V8. Furthermore, a clear alteration in endoplasmic reticulum (ER) stress was observed in cells treated with V8; upregulation of glucose‑regulated protein (GRP) 78, GRP94, C/EBP homologous protein, cleavage of caspase‑12, phosphorylated protein kinase RNA‑like endoplasmic reticulum kinase (p‑PERK), phosphorylated eukaryotic initiation factor 2α (p‑eIF2α) and activating transcription factor 4 (ATF4) was observed with qPCR and western blotting, suggesting that V8‑induced apoptosis is involved in the ER stress response. Overall, the present results demonstrated that V8 induced apoptosis in human MM RPMI 8226 cells via the PERK‑eIF2α‑ATF4 ER stress response pathway, which may provide novel directions for exploiting this compound as a potential anti‑neoplastic drug for MM therapy.
View Figures
View References

Related Articles

Journal Cover

October-2016
Volume 12 Issue 4

Print ISSN: 1792-1074
Online ISSN:1792-1082

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
x
Spandidos Publications style
Zhong Y, Zhang Y, Wang P, Gao H, Xu C and Li H: V8 induces apoptosis and the endoplasmic reticulum stress response in human multiple myeloma RPMI 8226 cells via the PERK‑eIF2α‑ATF4 signaling pathway. Oncol Lett 12: 2702-2709, 2016
APA
Zhong, Y., Zhang, Y., Wang, P., Gao, H., Xu, C., & Li, H. (2016). V8 induces apoptosis and the endoplasmic reticulum stress response in human multiple myeloma RPMI 8226 cells via the PERK‑eIF2α‑ATF4 signaling pathway. Oncology Letters, 12, 2702-2709. https://doi.org/10.3892/ol.2016.5005
MLA
Zhong, Y., Zhang, Y., Wang, P., Gao, H., Xu, C., Li, H."V8 induces apoptosis and the endoplasmic reticulum stress response in human multiple myeloma RPMI 8226 cells via the PERK‑eIF2α‑ATF4 signaling pathway". Oncology Letters 12.4 (2016): 2702-2709.
Chicago
Zhong, Y., Zhang, Y., Wang, P., Gao, H., Xu, C., Li, H."V8 induces apoptosis and the endoplasmic reticulum stress response in human multiple myeloma RPMI 8226 cells via the PERK‑eIF2α‑ATF4 signaling pathway". Oncology Letters 12, no. 4 (2016): 2702-2709. https://doi.org/10.3892/ol.2016.5005