Week in BioE (September 8, 2017)

A Breath of Fresh Air

lung grafts
A macrophage in the alveolus of a lung.

At Columbia, a new way of treating lung disease is under development. As reported recently in Science Advances, a Columbia research group, headed by Gordana Vunjak-Novakovic, Ph.D., from the Department of Biomedical Engineering, developed a way to prepare grafted lung tissue for transplantation that could make the process easier. The challenge has been removing the epithelial cells, which ultimately make up the surface of the organ, from potential grafts without damaging the blood vessels. Applying a detergent solution to lung tissue from rats, Dr. Vunjak-Novakovic’s team was able to obtain grafts that could subsequently be used as scaffolds for human pulmonary cells and stem cell-derived lung epithelial cells.  Although this approach remains in a very early state, the results here indicate promise for this technology for end-stage lung diseases such as emphysema.

Eliminating Obesity and Diabetes With Injections

You’ve probably heard that there’s an epidemic of obesity in the United States. Obesity carries an enormous health cost because it is linked to a variety of major health complications, including diabetes and heart disease. At a cell level, white fat cells require more energy to work off than brown fat cells. Approaches to fight obesity now include efforts to increase the number of brown fat cells. Scientists at Purdue University might have found a significant shortcut to creating more brown fat cells. By inhibiting the Notch signaling pathway, Meng Deng, Ph.D., of the Weldon School of Biomedical Engineering and his colleagues were able to cause white fat cells to convert into brown cells. Reporting their results in Molecular Therapy, the team used nanoparticles loaded with dibenazapine, a chemical used widely in pharmacology, to treat obese mice with targeted injections of the drug-laden nanoparticles. Results showed that the reduction of white fat in the mice was correlated with improved glucose metabolism and reduced body weight. While it’s not yet time to cancel the gym membership, an easier way to combat obesity could be on the horizon.

Diabetes is a chronic health condition with treatments that include diet management and/or insulin injections. In a new twist on diabetes treatments, scientists at the University of Toronto have shown, in a recent PNAS study, that pancreatic islets cells, which produce insulin, could be injected subcutaneously to reverse diabetes in mice. While the idea of transplanting islets into the pancreas has been investigated for some time, this is the first time that transplants were placed under the skin, far away from the pancreas. Impressively, the modules could be retrieved and reused. If future investigations are successful, these modules could form the basis of a treatment for type 1 (so-called juvenile) diabetes, which is caused by autoimmune destruction of the pancreatic islets.

News from New England

Feng Zhang, Ph.D., associate professor in the Departments of Brain and Cognitive Sciences and of Biological Engineering at MIT, is one of five scientists to receive the Albany Medical Prize in Medicine and Biomedical Research for his work on CRISPR-Cas9 gene editing technology. We offer Dr. Zhang our heartfelt congratulations.

Across the river from Cambridge in Medford, Tufts University has announced that its newly completed Science and Engineering Complex (SEC) will open this semester and will combine classrooms and laboratories — specifically what the developers are calling “lab neighborhoods,” or spaces for collaboration among laboratories working on related research questions. Bruce Panilaitis, Ph.D., a research assistant professor in the Department of Biomedical Engineering, is the director of the SEC, and his department will also have offices there.

Week in BioE (August 10, 2017)

Preventing Transplant Rejection

A healthy human T cell, one of the key immune system cells.

Organ transplantation is a lifesaving measure for people with diseases of the heart, lungs, liver, and kidneys that can no longer be treated medically or surgically. The United Network for Organ Sharing, a major advocacy group for transplant recipients, reports that a new person is added to a transplant list somewhere in America every 10 minutes. However, rejection of the donor organ by the recipient’s immune system remains a major hurdle for making every transplant procedure successful. Unfortunately, the drugs required to prevent rejection have serious side effects.

To address this problem, a research team at Cornell combined DNA sequencing and informatics algorithms to identify rejection earlier in the process, making earlier intervention more likely. The team, led by Iwijn De Vlaminck of the Department of Biomedical Engineering, report in PLOS Computational Biology that a computer algorithm they developed to detect donor-derived cell-free DNA, a type of DNA shed by dead cells, in the blood of the recipient could predict heart and lung allograft rejection with a 99% correlation with the current gold standard. The earlier that signs of rejection are detected, the more likely it is that an intervention can be performed to save the organ and, more importantly, the patient.

Meanwhile, at Yale, scientists have used nanoparticles to fight transplant rejection. Publishing their findings in Nature Communications, the study authors, led by Jordan S. Pober, Bayer Professor of Translational Medicine at Yale, and Mark Saltzman, Goizueta Foundation Professor of Chemical and Biomedical Engineering, used small-interfering RNA (siRNA) to “hide” donated tissue from the immune system of the recipient. Although the ability of siRNA to hide tissue in this manner has been known for some time, the effect did not last long in the body. The Yale team used poly(amine-co-ester) nanoparticles to deliver the siRNA that extended and extended its duration of effect, in addition to developing methods to deliver to siRNA to the tissue before transplantation. The technology has yet to be tested in humans, but provides an exciting new approach to help solve the transplant rejection challenge in medicine.

Africa in Focus

A group of engineering students at Wright State University, led by Thomas N. Hangartner, professor emeritus of biomedical engineering, medicine and physics, traveled to Malawi, a small nation in southern Africa, to build a digital X-ray system at Ludzi Community Hospital. Once on site, Hangartner and his student team trained the staff to use system on patients. The group hopes they have made a significant contribution to improving the standard of care in the country, which currently allocates only 9% of its annual budget to healthcare. While the project admitted has limited impact, it’s important to bear in mind that expanding public health on a global level is a game of inches. The developing world will rise to the standards of the developed world one village at a time, one hospital at a time.

Speaking of Africa, the recent Ebola outbreak in West Africa had global implications and prompted many international organizations to identify better methods to identify early signs of outbreak. Since diseases like Ebola can spread rapidly and aggressively, detecting the outbreak early can save thousands of lives. To this end, Tony Hu of Arizona State University’s School of Biological and Health Systems Engineering has partnered with the U.S. Army to develop a platform using porous silicone nanodisks that, coupled with a mass spectrometer, could be used to detect Ebola more quickly and less expensively. In particular, by determining the strain of the Ebola virus detected, treatment could be more specifically individualized for the patient. Dr. Hu presents the technology in a video available here.

Neurotech News

Karen Moxon, professor of biomedical and mechanical engineering at the University of California, Davis, recently showed that rats with spinal injuries recovered to a more significant extent when treated with a combination of serotonergic drugs and physical therapy. Dr. Moxon found that the treatment resulted in cortical reorganization to bypass the injury. Many consider combining two different drugs to treat a disease or injury; Moxon’s clever approach used a drug in combination with the activation of cortical circuits (electroceuticals), and approach that was not considered possible with some types of spinal cord injuries.

At Stanford,  Karl Deisseroth, professor of bioengineering and of psychiatry and behavioral sciences, led a study team that recently reported in Science Translational Medicine that mice bred to have a type of autism could receive a genetic therapy that caused their brain cells to activate differently. Although the brains of the autistic mice were technically normal, the mice were unsocial and lacked curiosity. Treatment modulated expression of the CNTNAP2 gene, resulting in increased sociability and curiosity. Their findings could have tremendous implications for treating autism in humans.

Elsewhere in neurotech, Cornell announced its intention to create a neurotech research hub, using a $9 million grant from the National Science Foundation. Specializing in types of neurological imaging, the new NeuroNex Hub and Laboratory for Innovative Neurotechnology will augment the neurotech program founded at Cornell in 2015.

Academic Developments

Two important B(M)E department have developed new programs. In Montreal, McGill University has introduced a graduate certificate program in translational biomedical engineering (video here). Also at the annual meeting of the American Society for Engineering Education in Columbus, Ohio, an interdisciplinary group of scholars from Worcester Polytechnic Institute, including three professors of engineering, presented a paper entitled “The Theatre of Humanitarian Engineering.” The authors developed an experimental role-playing course in which the students developed a waste management solution for a city. According to the paper’s abstract, a core misunderstanding about engineering is the belief that it exists separately from social and political contexts. With the approach they detail, the authors believe they could address the largely unmet call for greater integration of engineering with the humanities and social sciences on the academic level.