In response to the health threat posed by the recent outbreak of Zika virus in Latin America and its recent spread to Puerto Rico and Florida, researchers have been working at a furious pace to learn more about the mosquito-borne virus. Considerable progress has been made in understanding how Zika might cause babies to be born with unusually small heads and other abnormalities and in developing vaccines that may guard against Zika infection.
Still, there remains an urgent need to find drugs that can be used to treat people already infected with the Zika virus. A team that includes scientists at NIH’s National Center for Advancing Translational Sciences (NCATS) now has some encouraging news on this front. By testing 6,000 FDA-approved drugs and experimental chemical compounds on Zika-infected human cells in the lab, they’ve shown that some existing drugs might be repurposed to fight Zika infection and prevent the virus from harming the developing brain . While additional research is needed, the new findings suggest it may be possible to speed development and approval of new treatments for Zika infection.
Tags: Aedes mosquito, birth defects, CDK inhibitors, drug repurposing, drug screening, Ebola virus, emiricasan, microcephaly, mosquito, neural progenitor cells, niclosamide, organoids, PHA-690509, repurposing drugs, small-molecule inhibitors, vaccine, virology, Zika, Zika vaccine, Zika virus
A little more than a decade ago, researchers began adapting a familiar commercial concept to genomics: the barcode. Instead of the black, printed stripes of the Universal Product Codes (UPCs) that we see on everything from package deliveries to clothing tags, they used short, unique snippets of DNA to label cells. These biological “barcodes” enable scientists to distinguish one cell type from another, in much the same way that a supermarket scanner recognizes different brands of cereal.
DNA barcoding has already empowered single-cell analysis, including for nerve cells in the brain. Now, in a new NIH-supported study, DNA barcoding helps in the development of a new method that could greatly streamline an increasingly complex and labor-intensive process: screening for drugs to combat cancer.
Tags: barcoded cancer cell lines, biotechnology, BRD-7880, cancer, cancer cell lines, cancer drugs, DNA barcode, drug discovery, drug screening, genomics, mechanism of action, oncology, Precision Medicine Initiative, PRISM, Profiling Relative Inhibition Simultaneously in Mixtures, single cell analysis
A lot of time, money, and effort are devoted to developing new drugs. Yet only one of every 10 drug candidates entering human clinical trials successfully goes on to receive approval from the Food and Drug Administration (FDA) . Many would-be drugs fall by the wayside because they prove toxic to the brain, liver, kidneys, or other organs—toxicity that, unfortunately, isn’t always detected in preclinical studies using mice, rats, or other animal models. That explains why scientists are working so hard to devise technologies that can do a better job of predicting early on which chemical compounds will be safe in humans.
As an important step in this direction, NIH-funded researchers at the Morgridge Institute for Research and University of Wisconsin-Madison have produced neural tissue chips with many features of a developing human brain. Each cultured 3D “organoid”—which sits comfortably in the bottom of a pea-sized well on a standard laboratory plate—comes complete with its very own neurons, support cells, blood vessels, and immune cells! As described in Proceedings of the National Academy of Sciences , this new tool is poised to predict earlier, faster, and less expensively which new or untested compounds—be they drug candidates or even ingredients in cosmetics and pesticides—might harm the brain, particularly at the earliest stages of development.
Tags: Autism Spectrum Disorder, brain, brain development, brain on a chip, drug development, drug screening, human brain, human on a chip, machine learning, microglia, neural constructs, neural progenitor cells, neural support cells, neural tissue chip, neurodevelopmental disorders, neurology, neurons, neurotoxicity, organoid, RNA sequencing, stem cells, tissue chip, Tissue Chip for Drug Screening Program
The adult human heart is about the size of a large fist, divided into four chambers that beat in precise harmony about 100,000 times a day to circulate blood throughout the body. That’s a very dynamic system, and also a very challenging one to study in real-time in the lab. Understanding how the heart forms within developing human embryos is another formidable challenge. So, you can see why researchers are excited by the creation of tiny, 3D heart chambers with the ability to exist (see image above) and even beat (see video below) in a lab dish, or as scientists say “in vitro.”
To achieve this feat, an NIH-funded team from University of California, Berkeley, and Gladstone Institute of Cardiovascular Disease, San Francisco turned to human induced pluripotent stem (iPS) cell technology. The resulting heart chambers may be miniscule—measuring no more than a couple of hair-widths across—but they hold huge potential for everything from improving understanding of cardiac development to speeding drug toxicity screening.
Tags: bioengineering, birth defects, cardiology, cardiovascular disease, congenital heart defects, drug screening, geometric confinement, heart, heart chamber, heart development, induced Pluripotent Stem cells, iPS cells, microchambers, organs on a chip, pericardium, thalidomide, Tissue Chip for Drug Screening Program, tissue chips