RRC ID 51644
Author Tanaka T, Kikuchi N, Goto K, Iino M.
Title Sec6/8 regulates Bcl-2 and Mcl-1, but not Bcl-xl, in malignant peripheral nerve sheath tumor cells.
Journal Apoptosis
Abstract Sec6 and Sec8, which are components of the exocyst complex, has been concerned with various roles independent of its role in secretion, such as cell migration, invadopodia formation, cytokinesis, glucose uptake, and neural development. Given the vital roles of the exocyst complex in cellular and developmental processes, the disruption of its function may be closely related to various diseases such as cancer, diabetes, and neuronal disorders. Malignant peripheral nerve sheath tumors (MPNSTs) have high malignant potential and poor prognosis because of aggressive progression and metastasis. To date, no chemotherapeutic agents have been validated for MPNSTs treatment because how MPNSTs are resistant to chemotherapeutic agents remains unknown. This study demonstrates that combination of doxorubicin and sorafenib induces apoptosis in MPNST cells through downregulation of B cell lymphoma protein 2 (Bcl-2), Bcl-2-related protein long form of Bcl-x (Bcl-xl), and myeloid cell leukemia 1 (Mcl-1). Moreover, both Sec6 and Sec8 levels decreased after treatment with doxorubicin and sorafenib and were found to be associated with Bcl-2 and Mcl-1 expressions, but not Bcl-xl. Although Sec8 was found to be involved in the regulation of both Bcl-2 and Mcl-1 at the mRNA level, Sec6 regulated Bcl-2 at the mRNA level and the binding affinity of F-box and WD repeat domain containing 7 and Mcl-1, thereby controlling Mcl-1 at the protein level. Bcl-2 or Mcl-1 mRNA suppression by Sec6 or Sec8 depletion resulted in significant changes in nuclear factor-kappa B, cAMP response element, and p53 transcriptional activity. These results suggest that Sec6 and Sec8 are therapeutic target molecules in MPNST.
Volume 21(5)
Pages 594-608
Published 2016-5-1
DOI 10.1007/s10495-016-1230-9
PII 10.1007/s10495-016-1230-9
PMID 26892009
MeSH Antineoplastic Combined Chemotherapy Protocols / pharmacology* Apoptosis Cell Line, Tumor Doxorubicin / pharmacology Gene Expression Regulation, Neoplastic Humans Membrane Potential, Mitochondrial Myeloid Cell Leukemia Sequence 1 Protein / genetics* Myeloid Cell Leukemia Sequence 1 Protein / metabolism Nerve Sheath Neoplasms / genetics* Nerve Sheath Neoplasms / metabolism Nerve Sheath Neoplasms / physiopathology Niacinamide / analogs & derivatives Niacinamide / pharmacology Phenylurea Compounds / pharmacology Proto-Oncogene Proteins c-bcl-2 / genetics* Proto-Oncogene Proteins c-bcl-2 / metabolism Sorafenib Transcription, Genetic Vesicular Transport Proteins / antagonists & inhibitors Vesicular Transport Proteins / metabolism* bcl-X Protein / genetics bcl-X Protein / metabolism
IF 4.543
Times Cited 4
Human and Animal Cells HS-Sch-2(RCB2230) HS-PSS(RCB2362)