Scientists unlock key to cancer cell death mystery

Posted by pt91 at Mar 26, 2012 10:14 AM |
Team discovers mechanism for destroying particular cancer cells

Issued by University of Leicester Press Office on 26 March 2012

An international team of scientists has announced a new advance in the ability to target and destroy certain cancer cells.

A group led by the University of Leicester has shown that particular cancer cells are especially sensitive to a protein called p21.  This protein usually forces normal and cancer cells to stop dividing but it was recently shown that in some cases it can also kill cancer cells.

However, scientists have been unclear about how this happens.

Researcher Salvador Macip, from the University of Leicester Department of Biochemistry,  said: “If we could harness this ‘killing power’ that p21 has, we could think of designing new therapies aimed at increasing its levels in tumours. This is what motivated us to look into it”.

Now the team from the universities of Leicester and Cardiff in the UK, University of South Carolina, USA and Karolinska Institutet, Sweden has discovered that cells from sarcomas tend to die in response to p21 and that this is determined by the sensitivity of their mitochondria to oxidants.

They have published their findings in The Journal of Biological Chemistry.  The research was funded by the MRC, the NIH, CONACYT and the Swedish Cancer Society

Dr Macip added: “Our research also showed that p21 can kill cells even in the absence of p53, a protein that is in the main responsible for cell death but is inactivated in most cancers.

“This shows that certain types of cancer, sarcomas for instance, but maybe also others, should respond well to drugs that increase the levels of p21, even if they don’t have an active p53. The side effects of these therapies should be minimal, since our experiments show that normal cells would arrest but not die in response to p21.

“There are already drugs available that selectively increase p21. Our results provide a rationale for testing them in certain types of cancers, which could be identified using the experiments we describe.”


NOTE TO NEWSDESK: For more information, contact Salvador Macip (

Reference: Reactive oxygen species and mitochondrial sensitivity to oxidative stress determine induction of cancer cell death by p21. Masgras I, Carrera S, de Verdier PJ, Brennan P, Majid A, Makhtar W, Tulchinksy E, Jones GD, Roninson IB, Macip S. J Biol Chem. 2012 Feb 6. [Epub ahead of print]

The Journal of Biological Chemistry, Vol. 287, Issue 13, 9845-9854, MARCH 23, 2012

Ionica Masgras; Samantha Carrera; Salvador Macip; Aneela Majid; Wan Makhtar; Eugene Tulchinsky; George D. D. Jones University of Leicester

Petra J. de Verdier

Karolinska Institutet

Paul Brennan

Cardiff University

Igor B. Roninson

University of South Carolina


For almost 100 years the Medical Research Council has improved the health of people in the UK and around the world by supporting the highest quality science. The MRC invests in world-class scientists. It has produced 29 Nobel Prize winners and sustains a flourishing environment for internationally recognised research. The MRC focuses on making an impact and provides the financial muscle and scientific expertise behind medical breakthroughs, including one of the first antibiotics penicillin, the structure of DNA and the lethal link between smoking and cancer. Today MRC funded scientists tackle research into the major health challenges of the 21st century.

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