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Ral A, via activating the mitotic checkpoint, sensitizes cells lacking a functional Nf1 to apoptosis in the absence of protein kinase C.

Artikel i vetenskaplig tidskrift
Författare Suthakar Ganapathy
Johan Bourghardt Fagman
Ling Shen
Tianqi Yu
Xiaodong Zhou
Wei Dai
Alexandros Makriyannis
Changyan Chen
Publicerad i Oncotarget
Volym 7
Nummer/häfte 51
Sidor 84326-84337
ISSN 1949-2553
Publiceringsår 2016
Publicerad vid Institutionen för kliniska vetenskaper, Avdelningen för kirurgi
Sidor 84326-84337
Språk en
Länkar dx.doi.org/10.18632/oncotarget.1260...
Ämneskategorier Medicinsk cellbiologi

Sammanfattning

Nf1 mutations or deletions are suggested to underlie the tumor predisposition of NF1 (neurofibromatosis type 1) and few treatments are available for treating NF1 patients with advanced malignant tumors. Aberrant activation of Ras in Nf1-deficient conditions is responsible for the promotion of tumorigenesis in NF1. PKC is proven to be an important factor in supporting the viability of Nf1-defected cells, but the molecular mechanisms are not fully understood. In this study, we demonstrate that the inhibition of protein kinase C (PKC) by 1-O-Hexadecyl-2-O-methyl-rac-glycerol (HMG, a PKC inhibitor) preferentially sensitizes Nf1-defected cells to apoptosis, via triggering a persistent mitotic arrest. In this process, Ral A is activated. Subsequently, Chk1 is phosphorylated and translocated to the nucleus. Silencing Ral A significantly blocks Chk1 nuclear translocation and releases HMG-treated Nf1-deficient cells from mitotic arrest, resulting in the reduction of the magnitude of apoptosis. Thus, our study reveals that PKC is able to maintain the homeostasis or viability of Nf1-defected cells and may serve as a potential target for developing new therapeutic strategies.

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