Scientists at Joslin Diabetes Center in Boston have uncovered important molecular and genetic keys to the development of soft-tissue sarcomas in skeletal muscle, giving researchers and clinicians additional targets to stop the growth of these often deadly tumors.
Published in the Proceedings of the National Academy of Sciences, the study identified two major molecular signaling pathways (the Ras and mTOR pathways) that are common in tumor growth and development. These molecular pathways regulate cell growth and division, two cellular properties whose over-activation are hallmarks of cancer biology.
"In humans, some sarcomas respond to chemotherapy," says lead author Amy J. Wagers, PhD, an associate professor of stem cell and regenerative biology at Harvard Medical School and Joslin Diabetes Center, "but many don't. With these findings, we have vetted a list of new candidate targets whose inhibition may lead to regression of these tumors. "
Many soft-tissue sarcomas, which develop in certain tissues such as bone and muscle, carry specific genetic mutations or unique gene signatures, which can allow scientists to develop more precise, targeted therapies. Wagers and her colleagues engineered a tumor system in mice by introducing into mouse skeletal muscle a cancer-carrying gene, or oncogene, known to cause tumors in humans. They used this engineered system to identify a small set of genes that are active in sarcoma tumors.
There are many different types of soft-tissue sarcomas, which develop in tissues that connect, support or surround other structures and organs, including muscle, tendons, nerves, fat and blood vessels. If diagnosed early, treatment, primarily through surgical removal of the tumor, radiation therapy or chemotherapy, can be effective. If the tumor has spread, however, the tumor can be controlled only for a period of time, but treatment does not often cure the disease.
By inducing these tumors in mice, Wagers says the scientists knew when the tumors would form in the mice and where in the body they would develop, which helped them better understand the molecular and genetic pathways underlying the disease. With this knowledge, researchers may be able to develop new intervention strategies that interfere with these genetic activities and stop the growth of this type of tumor.
"With the engineered system we developed, we can find new fragile points in the tumor to target," says first author Simone Hettmer, MD, a pediatric oncologist at the Dana-Farber/Children's Hospital Cancer Center, who treats children with these tumors. In addition, she adds, the system allows scientists to look at the genetic changes in sarcomas and how they interact with the development of tumors and can be applied to sarcomas in tissues other than skeletal muscle.
Surprisingly, says Wagers, the researchers found they could induce tumors using several different "beginning" cells. The scientists generated tumor cells using stem cell-like cells that go on to make either muscle or other connective tissues. Tumors that develop from muscle cells were rhabdomyosarcomas, the most common form of soft-tissue sarcoma seen in children, while tumors that developed from non-muscle cells represented other types of sarcoma.
Wagers and her colleagues are now working on establishing a similar engineered model using human cells to test the effectiveness of anti-sarcoma medications. These preclinical experiments are designed to identify the most promising candidates for the treatment of soft-tissue sarcoma that ultimately will be pursued in human clinical trials. Early studies have identified several chemical compounds that, in cell cultures at least, appear to slow the growth of sarcoma cells.
In addition to Wagers and Hettmer, other Joslin co-authors of the study were Jianing Liu, Christine Miller, and Melissa Lindsay, as well as Cynthia Sparks and David Guertin of the University of Massachusetts Medical School, Roderick Bronson of the Tufts University School of Veterinary Medicine, and David Langenau of Massachusetts General Hospital.
About Joslin Diabetes Center
Joslin Diabetes Center is the world's preeminent diabetes research and clinical care organization. Joslin is dedicated to ensuring that people with diabetes live long, healthy lives and offers real hope and progress toward diabetes prevention and a cure. Joslin is an independent, nonprofit institution affiliated with Harvard Medical School. For more information about Joslin, visit www.joslin.org. Keep up with Joslin research and clinical news at Inside Joslin at www.joslin.org/news/inside_joslin.html, Become a fan of Joslin on Facebook at www.facebook.com/joslindiabetes and follow Joslin on Twitter at www.twitter.com/joslindiabetes
Jeffrey Bright | EurekAlert!
BigH1 -- The key histone for male fertility
14.12.2017 | Institute for Research in Biomedicine (IRB Barcelona)
Guardians of the Gate
14.12.2017 | Max-Planck-Institut für Biochemie
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
14.12.2017 | Physics and Astronomy
14.12.2017 | Life Sciences
14.12.2017 | Life Sciences