One of the most important tumor
suppressors, p53, stops healthy cells from becoming cancerous. It has previously been described as the 'guardian of the genome' and voted
'Molecule of the Year' in 1993, and is one of the most important
proteins regulating cell growth.
p53 is also a major focus for oncology research. It is a protein that has the ability to interrupt the cell cycle and block the division of diseased cells.
Researchers from CharitÚ - Universitńtsmedizin Berlin, the Medical University of Graz and the German Institute of Human Nutrition in Potsdam-Rehbruecke have found that p53 accumulates in liver after food withdrawal. They also show that p53 in liver plays a crucial role in the body's metabolic adaptation to starvation.
In order to better understand the physiological regulation of p53, the researchers around Prof. Dr. Michael Schupp from CharitÚ's Institute of Pharmacology studied the regulation and function of p53 in normal, healthy cells. After withholding food from mice for several hours, the researchers were able to show that p53 protein accumulates in the liver.
In order to determine which type of liver cells cause this accumulation, the researchers repeated the experiment using cultured hepatocytes. They found that the starvation-induced accumulation of p53 was indeed detectable in hepatocytes, irrespective of whether these cells were of mouse or human origin.
"Our data also suggest that the accumulation of p53 is mediated by a cellular energy sensor, and that it is crucial for the metabolic changes associated with starvation," explains Prof. Michael Schupp. The researchers were able to show that mice with an acute inactivation of the p53 gene in liver had difficulties in adapting their metabolisms to starvation.
"Food intake seems crucial in determining the protein levels of p53 in liver, and p53 also plays an important role in normal liver metabolism," says Prof. Schupp. The researchers are planning to study whether their observations are limited to liver cells, or whether this p53 accumulation also occurs in other tissues and organs.
Prof. Schupp concludes, "It would be interesting to conduct further experiments to test whether the starvation-induced accumulation of p53 has an effect on the development of specific forms of cancer, or whether certain ways of timing meals might affect p53 protein levels in such a way as to promote cancer development."