A group of small molecules called EETs – currently under scrutiny as possible treatment targets for a host of cardiovascular diseases – may also drive the growth and spread of cancer, according to researchers at the Dana-Farber/Children's Hospital Cancer Center (DF/CHCC) and other institutions. Their findings also raise the possibility that drugs that block EETs could serve as a new avenue for cancer treatment.
This study, led by Dipak Panigrahy, MD, of DF/CHCC and the Vascular Biology Program at Children's Hospital Boston, appeared online December 19 in the Journal of Clinical Investigation.
EETs (or epoxyeicosatrienoic acids) are small fatty molecules, part of a larger family of lipids normally produced by the endothelial cells that line blood vessels to control inflammation and the response to injury. These molecules are also potent regulators of blood pressure, leading pharmaceutical companies to investigate compounds that raise EET levels for the treatment of nearly 20 cardiovascular diseases, including hypertension, stroke, and diabetes.
However, little work has been done to learn whether these molecules themselves might have some role to play in tumor growth or progression. This is despite evidence that enzymes that process EETs are associated with cancer, and that EETs can promote angiogenesis – the growth of blood vessels.
"EETs have primarily been studied in models of cardiovascular disease," said the study's lead author, Dipak Panigrahy, MD. "This is the first time that direct administration of exogenous EETs and of specific EET antagonists has been investigated in pre-clinical cancer models."
In order to determine the extent of the relationship between EETs and cancer, Panigrahy and his collaborators conducted a series of studies using animal models of EET activity developed in the laboratory of Darryl Zeldin, MD, at the National Institute of Environmental Health Sciences, part of the National Institutes of Health.
"NIEHS was pleased to work with such a distinguished international research team to address this important issue," Zeldin said.
With the models, the researchers were able to document that increasing the levels of EET levels – either by increasing their natural production or injecting them systemically – creates an environment conducive to tumor growth, even contributing to the transition of early tumors from a dormant state to active malignancy. They also found that EETs work in concert with VEGF, a potent stimulator of angiogenesis in both normal and cancerous tissues, to promote tumor metastasis, even in cancers that rarely spread to other organs.
"Many people have dormant tumors that may never become fully malignant," said Panigrahy. "The switch from a dormant to an active state is critically dependent on angiogenesis, as is metastasis, and so patients who have a high cancer risk could potentially increase that risk further by raising their EET levels."
The study team also found that compounds that block the activity of EETs, called EET antagonists, could reduce tumor growth and metastasis in the same animal models, suggesting that such compounds could have benefit as cancer treatments.
"Cardiovascular disease is a major cause of death in North America, and as such drugs that raise EET levels could provide significant benefit," says DF/CHCC's Mark Kieran, MD, PhD, one of the paper's senior authors. "We must be cautious, though, that in manipulating these molecules to regulate blood pressure we do not favor cancer growth and metastasis, another common cause of death.
"With these findings, though," Kieran continued, "we now have a better idea of how cancers drive themselves, opening up a new pathway for understanding and potentially treating cancer and metastasis that wasn't available to us before. At the same time, this data could potentially help inform the design of cardiovascular drugs that avoid raising cancer risk through this mechanism."
The study was funded by the National Cancer Institute, the National Institute of Environmental Health Sciences, the NIH Division of Intramural Research, the Stop and Shop Pediatric Brain Tumor Fund, the C.J. Buckley Pediatric Brain Tumor Fund, and the Robert A. Welch Foundation.
Children's Hospital Boston is home to the world's largest research enterprise based at a pediatric medical center, where its discoveries have benefited both children and adults since 1869. More than 1,100 scientists, including nine members of the National Academy of Sciences, 11 members of the Institute of Medicine and nine members of the Howard Hughes Medical Institute comprise Children's research community. Founded as a 20-bed hospital for children, Children's Hospital Boston today is a 395 bed comprehensive center for pediatric and adolescent health care grounded in the values of excellence in patient care and sensitivity to the complex needs and diversity of children and families. Children's also is the primary pediatric teaching affiliate of Harvard Medical School. For more information about research and clinical innovation at Children's, visit: http://vectorblog.org.
Dana-Farber Cancer Institute (www.dana-farber.org) is a principal teaching affiliate of the Harvard Medical School and is among the leading cancer research and care centers in the United States. It is a founding member of the Dana-Farber/Harvard Cancer Center (DF/HCC), designated a comprehensive cancer center by the National Cancer Institute. It provides adult cancer care with Brigham and Women's Hospital as Dana-Farber/Brigham and Women's Cancer Center and it provides pediatric care with Children's Hospital Boston as Dana-Farber/Children's Hospital Cancer Center. Dana-Farber is the top ranked cancer center in New England, according to U.S. News & World Report, and one of the largest recipients among independent hospitals of National Cancer Institute and National Institutes of Health grant funding.Follow Dana-Farber on Twitter:@danafarber Follow Dana-Farber on Facebook: www.facebook.com/danafarbercancerinstitute
Colleen Connolly | EurekAlert!
Satellites, airport visibility readings shed light on troops' exposure to air pollution
09.12.2016 | Veterans Affairs Research Communications
Oxygen can wake up dormant bacteria for antibiotic attacks
08.12.2016 | Penn State
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine