PKCmu prevents CD95-mediated apoptosis and enhances proliferation in pancreatic tumour cells.

Abstract:

:Loss of growth control and a marked resistance to apoptosis are considered major mechanisms driving tumour progression. Protein kinases C (PKC) have been shown to be important in the regulation of proliferation and apoptosis. In this report, we investigated the role of the PKC-like kinase PKCmu in the control of these processes in pancreatic adenocarcinoma cells. We demonstrate that in these cells, PKCmu expression strongly correlates with resistance to CD95-induced apoptosis. Inhibition of PKCmu with Goe6983 sensitized resistant cells to CD95-induced apoptosis. In CD95-sensitive Colo357 cells, forced overexpression of PKCmu strongly reduced CD95-mediated apoptosis, an effect that could be reversed by pretreatment with Goe6983. In addition, PKCmu overexpression led to a strongly enhanced cell growth and to a significant increase of telomerase activity. In an attempt to identify the signalling pathways affected by PKCmu, we identified the antiapoptotic proteins c-FLIPL and survivin to be strongly upregulated in PKCmu overexpressing cells. Immunohistochemical analysis of pancreatic tumour tissue of 48 patients and 10 normal pancreatic tissues revealed marked overexpression of PKCmu in tumours. In conclusion, we showed that PKCmu controls proliferative, as well as anti-apoptotic, signalling pathways and therefore plays an important role in acquiring the malignant phenotype of pancreatic tumours.

journal_name

Oncogene

journal_title

Oncogene

authors

Trauzold A,Schmiedel S,Sipos B,Wermann H,Westphal S,Röder C,Klapper W,Arlt A,Lehnert L,Ungefroren H,Johannes FJ,Kalthoff H

doi

10.1038/sj.onc.1207001

subject

Has Abstract

pub_date

2003-12-04 00:00:00

pages

8939-47

issue

55

eissn

0950-9232

issn

1476-5594

pii

1207001

journal_volume

22

pub_type

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