"With any anticoagulant, you are trying to reduce your chances of having clotting because it can lead to a heart attack or stroke during treatment," said Bruce Sullenger, Ph.D., senior author and Vice Chair for Research and Joseph W. and Dorothy W. Beard Professor of Surgery. Yet bleeding is a common side effect during and after treatments that require anticoagulation therapy such as surgery or angioplasty.
These new antidotes may give doctors a way to quickly and precisely put the brakes on an anticoagulant if bleeding becomes a problem or neutralize other adverse events or toxicities.
Duke researchers have just completed a series of successful clinical trials in patients taking a blood-thinner aptamer and an antidote engineered to reverse the effects of the aptamer.
"We have shown that this type of antidote can reverse the action of any of the aptamer drugs, and there are many aptamers in development," Sullenger said. Their approach amounts to a universal antidote to the entire aptamer family. "We predict that this advance will significantly expand the number of diseases that can be more safely treated using antidote-controllable therapeutic agents," he said.
The new approach, called RNA-based aptamer technology, "provides the opportunity to make safer drugs," said Sullenger, who also directs the Duke Translational Research Institute. "And now that we can engineer a universal antidote for aptamers, we can in principle for the first time afford to provide additional control over drugs for patients and their physicians."
Aptamers are oligonucelotides, short stretches of nucleic acid that bind to a specific target molecule. If a patient takes an aptamer drug, the drug is the only free oligonucleotide in the body.
The researchers studied eight aptamer drugs and showed that the antidotes they introduced could reverse the activity of any of the drugs, regardless of the sequence, shape or target of the drug.
One advantage of aptamer drugs, as opposed to antibody-based drugs, is that nucleic acids aren't typically recognized by the human immune system as foreign agents. Aptamers do not generally trigger an immune response, Sullenger said.
"This technology could be applied to any oligonucleotide-based therapeutic that is free in a patient's circulation," said lead author Sabah Oney, Ph.D., formerly with the Sullenger laboratory and now a senior scientist at b3bio, a biotechnology company Sullenger helped co-found in the Research Triangle Park.
"With the ever-increasing number of such drugs in clinical trials, we believe that this discovery can have very broad applications and improve the safety profile of these therapeutics," Oney said. "This could be rapidly translated into the clinic, and lead to a whole new class of safer therapeutic agents."
To date, one aptamer has been approved by the U.S. Food and Drug Administration, a drug for macular degeneration, a cause of blindness. Several others are being tested and developed for use in cardiovascular, hematology and cancer patients.
"This research potentially represents the next frontier of controlled therapeutics using nucleic acids as highly selective antithrombotics and neutralizing polymers," said Richard C. Becker, M.D., Professor of Medicine in the Duke Divisions of Cardiology and Hematology and a scientist in the Duke Clinical Research Institute (DCRI) who has worked on clinical trials with the aptamer antidotes. "The translational platform for antithrombotic therapy pioneered by the Sullenger laboratory in collaboration with the DCRI underscores the unlimited potential of clinicians and scientists collaborating with purpose and commitment to advance patient care."
"Future optimization should further improve the potency of sequestering the aptamers from circulation, which will then spur the development of many new aptamer drugs," said Kam Leong, a James B. Duke professor of biomedical engineering and co-author of the study.
Other authors on the paper include Ruby T. S. Lam of the Duke Department of Biomedical Engineering, Kristin M. Bompiani and Charlene M. Blake of the Duke University Program in Genetics and Genomics and the Duke Department of Surgery, George Quick of the Duke Translational Research Institute, Jeremy Heidel and Joanna Yi-Ching Liu of Calando Pharmaceuticals, and Brendan C. Mack and Mark E. Davis of the Department of Chemical Engineering at the California Institute of Technology.
This work was supported by a grant from the National Institutes of Health, a predoctoral fellowship from the American Heart Association, and a grant from the National Cancer Institute.
Mary Jane Gore | EurekAlert!
Using fragment-based approaches to discover new antibiotics
21.06.2018 | SLAS (Society for Laboratory Automation and Screening)
Scientists learn more about how gene linked to autism affects brain
19.06.2018 | Cincinnati Children's Hospital Medical Center
Russian researchers together with their French colleagues discovered that a genuine feature of superconductors -- quantum Abrikosov vortices of supercurrent -- can also exist in an ordinary nonsuperconducting metal put into contact with a superconductor. The observation of these vortices provides direct evidence of induced quantum coherence. The pioneering experimental observation was supported by a first-ever numerical model that describes the induced vortices in finer detail.
These fundamental results, published in the journal Nature Communications, enable a better understanding and description of the processes occurring at the...
In a recent publication in the renowned journal Optica, scientists of Leibniz-Institute of Photonic Technology (Leibniz IPHT) in Jena showed that they can accurately control the optical properties of liquid-core fiber lasers and therefore their spectral band width by temperature and pressure tuning.
Already last year, the researchers provided experimental proof of a new dynamic of hybrid solitons– temporally and spectrally stationary light waves resulting...
Scientists from the University of Freiburg and the University of Basel identified a master regulator for bone regeneration. Prasad Shastri, Professor of...
Moving into its fourth decade, AchemAsia is setting out for new horizons: The International Expo and Innovation Forum for Sustainable Chemical Production will take place from 21-23 May 2019 in Shanghai, China. With an updated event profile, the eleventh edition focusses on topics that are especially relevant for the Chinese process industry, putting a strong emphasis on sustainability and innovation.
Founded in 1989 as a spin-off of ACHEMA to cater to the needs of China’s then developing industry, AchemAsia has since grown into a platform where the latest...
The BMBF-funded OWICELLS project was successfully completed with a final presentation at the BMW plant in Munich. The presentation demonstrated a Li-Fi communication with a mobile robot, while the robot carried out usual production processes (welding, moving and testing parts) in a 5x5m² production cell. The robust, optical wireless transmission is based on spatial diversity; in other words, data is sent and received simultaneously by several LEDs and several photodiodes. The system can transmit data at more than 100 Mbit/s and five milliseconds latency.
Modern production technologies in the automobile industry must become more flexible in order to fulfil individual customer requirements.
13.06.2018 | Event News
08.06.2018 | Event News
05.06.2018 | Event News
25.06.2018 | Physics and Astronomy
25.06.2018 | Earth Sciences
25.06.2018 | Power and Electrical Engineering