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Surprise discovery made in cancer research
Date:12/1/2008

This release is available in German.

One of the defining characteristics of cancer cells is that they systematically prevent programmed cell death (apoptosis), with which the body guards itself against the proliferation of defective cells. In order to do this, they express so-called apoptosis inhibitors (IAPs) among other proteins.

Many of the cancer drugs currently undergoing clinical trials target IAPs, since if the levels of IAPs are reduced, tumour cells will be destroyed by the body's own self-protecting mechanism or by the chemotherapeutic drugs. However, as a research group from the Goethe University in Frankfurt, working with scientists at the Universities of Wrzburg and Philadelphia have recently discovered, IAPs also have another life: they control cell migration. Where IAP production is suppressed, there is a significant increase in C-RAF kinase, a crucial member of a signal cascade, which, among other functions, controls cell migration. This also means that when IAP levels are reduced, metastasis may be promoted unexpectedly in the absence of cell death. According to the researchers, drugs to target IAPs should therefore only be used with caution in future.

Dr. Krishnaraj Rajalingam, leader of the Emmy-Noether Group at the Institute for Biochemistry at Frankfurt's Goethe University, claims that these findings have been a great surprise. As he puts it: "Up until now, IAPs were well known for their role in apoptosis suppression, but we now realise that they can also influence other processes like cell migration". The classical mitogenic cascade (MAPK) is triggered by RAS proteins, which are activated by mutations in nearly 20 % of all human tumours. In this signalling cascade, the RAS-protein is immediately followed by the C-RAF kinase, which as the researchers report in the current issue of 'Nature Cell Biology' binds strong
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Contact: Krishnaraj Rajalingam
krishna@biochem2.de
49-069-630-15569
Goethe University Frankfurt
Source:Eurekalert  

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