The researchers say their findings suggest that Smac-mimetic compounds could be useful as targeted cancer treatments for lung and other cancers. Such therapy may be less toxic to healthy cells than current compounds used in cancer chemotherapy.
The researchers, led by Howard Hughes Medical Institute investigator Xiaodong Wang, published their findings in the November, 2007, issue of the journal Cancer Cell. Wang is at the University of Texas Southwestern Medical Center.
Cells that are defective or that become unnecessary during growth and development are induced to commit suicide through a finely balanced process known as apoptosis, or programmed cell death. A protein called Smac, which is a shortened version of “second mitochondria-derived activator of apoptosis,” is a part of the cell’s programmed cell death machinery. When that machinery is switched on, Smac is released from the mitochondria and triggers the pathway that kills damaged or abnormal cells. Cancer cells, however, can survive Smac’s death signal by switching off the apoptotic machinery.
To see if they could get around this problem, Wang and other researchers have developed small-molecule mimetics of Smac that can enter the cell and trigger apoptosis. These mimetic molecules do their damage without the need for the Smac signal from the mitochondria. In earlier studies, Wang and his colleagues found that a Smac mimetic that they developed in the lab could kill cancer cells in culture. But they found that the cancer cells are only killed when the mimetic molecule is introduced in conjunction with another component of the apoptotic machinery known as TNFá.
In the new studies published in Cancer Cell, Wang and his colleagues found that a significant percentage of human non-small-cell lung cancer cell lines were sensitive to treatment by the Smac mimetic alone. When the researchers introduced those sensitive cells into mice and allowed them to produce tumors, they found that the Smac mimetic caused the tumors to regress and, in some cases, even disappear.
“These findings made us wonder what it was about these cell lines that made them sensitive to the Smac mimetic alone,” said Wang. “Cancer cells are hard to kill, but these cell lines seemed to have already become sensitized to apoptosis.”
The researchers’ studies revealed that the sensitive cell lines produced their own TNFá, so they were already “primed” for apoptosis. The paradox, said Wang, is that TNFá signaling is also part of a complex pathway that gives cancer cells a “survival” signal, offering them a growth advantage. The researchers also found that some breast cancer and melanoma cell lines were sensitive to the Smac mimetic alone.
“Thus, in these cancer cell lines, the TNFá survival advantage turns out to be a fatal flaw, because the same pathway can be switched to apoptosis by Smac mimetics,” said Wang. “So, for some cancers, we might be able to use Smac mimetics as a single treatment agent. And we can use the presence of TNFá as a marker to tell us which tumors will respond to the Smac mimetic alone.”
“People have been suspecting for a long time that some cancer cells may somehow turn on their apoptotic pathway already,” said Wang. “And now we know what pathway they turn on and why. We can take advantage of this phenomenon for potential cancer therapy by switching a signal into a deadly one with Smac mimetics.”
Jennifer Michalowski | EurekAlert!
Study shines light on brain cells that coordinate movement
26.06.2017 | University of Washington Health Sciences/UW Medicine
New insight into a central biological dogma on ion transport
26.06.2017 | Aarhus University
An international team of scientists has proposed a new multi-disciplinary approach in which an array of new technologies will allow us to map biodiversity and the risks that wildlife is facing at the scale of whole landscapes. The findings are published in Nature Ecology and Evolution. This international research is led by the Kunming Institute of Zoology from China, University of East Anglia, University of Leicester and the Leibniz Institute for Zoo and Wildlife Research.
Using a combination of satellite and ground data, the team proposes that it is now possible to map biodiversity with an accuracy that has not been previously...
Heatwaves in the Arctic, longer periods of vegetation in Europe, severe floods in West Africa – starting in 2021, scientists want to explore the emissions of the greenhouse gas methane with the German-French satellite MERLIN. This is made possible by a new robust laser system of the Fraunhofer Institute for Laser Technology ILT in Aachen, which achieves unprecedented measurement accuracy.
Methane is primarily the result of the decomposition of organic matter. The gas has a 25 times greater warming potential than carbon dioxide, but is not as...
Hydrogen is regarded as the energy source of the future: It is produced with solar power and can be used to generate heat and electricity in fuel cells. Empa researchers have now succeeded in decoding the movement of hydrogen ions in crystals – a key step towards more efficient energy conversion in the hydrogen industry of tomorrow.
As charge carriers, electrons and ions play the leading role in electrochemical energy storage devices and converters such as batteries and fuel cells. Proton...
Scientists from the Excellence Cluster Universe at the Ludwig-Maximilians-Universität Munich have establised "Cosmowebportal", a unique data centre for cosmological simulations located at the Leibniz Supercomputing Centre (LRZ) of the Bavarian Academy of Sciences. The complete results of a series of large hydrodynamical cosmological simulations are available, with data volumes typically exceeding several hundred terabytes. Scientists worldwide can interactively explore these complex simulations via a web interface and directly access the results.
With current telescopes, scientists can observe our Universe’s galaxies and galaxy clusters and their distribution along an invisible cosmic web. From the...
Temperature measurements possible even on the smallest scale / Molecular ruby for use in material sciences, biology, and medicine
Chemists at Johannes Gutenberg University Mainz (JGU) in cooperation with researchers of the German Federal Institute for Materials Research and Testing (BAM)...
19.06.2017 | Event News
13.06.2017 | Event News
13.06.2017 | Event News
26.06.2017 | Life Sciences
26.06.2017 | Physics and Astronomy
26.06.2017 | Information Technology