by Jack D. Hidary
It is time for a complete revolution in how we treat cancer. The current trifecta of surgery, radiation and chemotherapy has yielded marginal improvements in outcomes, but will not provide long-term positive results for the growing number of cancer cases in society.
The good news is that we have new tools at hand. Each of these needs further development, but this is where we should be focused. Here are four tools worth spending time and money on to bring to the fore of cancer treatment:
1/ Immunotherapy; 2/ Genomics; 3/ Nanomedicine; and 4/ Machine learning
Full post at https://www.linkedin.com/pulse/new-day-cancer-treatment-jack-hidary/
Artificial viral capsids that hold their own genomic material could aid drug delivery
To produce synthetic capsids, bacteria transcribe two DNA genes (not shown) into one piece of mRNA (bicistronic) and translate the mRNA into proteins, which oligomerize to trimers and pentamers. The oligomers bind their encoding mRNA and self-assemble into capsids that can then be tested in mice.
Credit: Adapted from Nature
Viruses are pretty simple: They’re small DNA or RNA genomes enclosed in protein containers called capsids. Scientists have designed and engineered proteins that self-assemble into viruslike containers that hold cargoes such as drugs, vaccines, and biomolecules.
David Baker of the University of Washington and coworkers have now devised the first so-called nucleocapsids, artificial capsids that enclose their own RNA genomes. The development opens the door for researchers to use directed evolution, a repetitive protein mutation and screening technique, to optimize the properties of these protein containers for drug delivery applications (Nature 2017, DOI: 10.1038/nature25157).
In particular, the team optimized nucleocapsids to remain stable for long times and to protect their RNA cargoes from degradation while floating around in the bloodstreams of mice. The artificial nucleocapsids could be useful for delivering small molecules, biomolecules, or materials for therapeutic or nanomaterials applications. They could even provide housing for future synthetic lifeforms, the researchers say. Rest
New York Times article summary: With every birth, cells begin anew. Scientists have found a biological mechanism underpinning the process in worms, which one day may be harnessed to restore our own damaged cells.
A lysosomal switch triggers proteostasis renewal in the immortal C. elegans germ lineage (Nature abstract)
Although individuals age and die with time, an animal species can continue indefinitely, because of its immortal germ-cell lineage1. How the germline avoids transmitting damage from one generation to the next remains a fundamental question in biology. Here we identify a lysosomal switch that enhances germline proteostasis before fertilization. We find that Caenorhabditis elegans oocytes whose maturation is arrested by the absence of sperm2 exhibit hallmarks of proteostasis collapse, including protein aggregation. Remarkably, sperm-secreted hormones re-establish oocyte proteostasis once fertilization becomes imminent. Key to this restoration is activation of the vacuolar H+-ATPase (V-ATPase), a proton pump that acidifies lysosomes3. Sperm stimulate V-ATPase activity in oocytes by signalling the degradation of GLD-1, a translational repressor4 that blocks V-ATPase synthesis. Activated lysosomes, in turn, promote a metabolic shift that mobilizes protein aggregates for degradation, and reset proteostasis by enveloping and clearing the aggregates. Lysosome acidification also occurs during Xenopus oocyte maturation; thus, a lysosomal switch that enhances oocyte proteostasis in anticipation of fertilization may be conserved in other species.
Originally posted by Jack Hidary on his LinkedIn account:
3/ A third approach that has yet to reach the clinic, but will in the next 5 years is nanomedicine. There are a number of funded companies working on nanomedical devices such as one which can sop up a decoy chemical produced by tumors to hide from the body’s immune system. These are not pharmacological agents, but instead act in a machine-like manner to help the body fight cancer.
Image Source: nano.cancer.gov
Full post here
Photothermal desorption of molecules from plasmonic nanoparticles is an example of a light-triggered molecular release due to heating of the system. However, this phenomenon ought to work only if the molecule–nanoparticle interaction is exothermic in nature. In this study, we compare protein adsorption behavior onto gold nanoparticles for both endothermic and exothermic complexation reactions, and demonstrate that Le Chatelier’s principle can be applied to predict protein adsorption or desorption on nanomaterial surfaces. Polyelectrolyte-wrapped gold nanorods were used as adsorption platforms for two different proteins, which we were able to adsorb/desorb from the nanorod surface depending on the thermodynamics of their interactions. Furthermore, we show that the behaviors hold up under more complex biological environments such as fetal bovine serum.
A team of researchers at the Stanford University School of Medicine has launched a new challenge for the online computer game Eterna in which players are being asked to design an RNA molecule capable of acting as an on/off switch for the gene-editing tool CRISPR/Cas9.
Molecular biologists will then build and test the actual molecules, based on the most promising designs provided by the players.
A gene editor as powerful as CRISPR could have unexpected effects inside living cells, so it makes sense to turn it off when it’s not needed. In addition, an on/off switch might be able to put CRISPR-influenced genes on a sort of timer, activating and deactivating them on a schedule that could mimic the way we schedule taking doses of drugs.
Faking cellular suicide could help control inflammation
And that could help treat everything from hay fever to arthritis
AS PARACELSUS first pointed out in the 16th century, it is the dose that makes the poison. Inflammation, in particular, is vital to fighting infection or healing wounds. If it lingers, however, it can cause more harm than good. Chronic inflammation often impedes the very healing that it is meant to promote. Many drugs have been invented to combat that problem, but none is as effective as doctors would like. Now, as they describe in a paper in ACS Macro Letters, a team led by Mitsuhiro Ebara at the National Institute for Materials Science in Japan have come up with a new approach. They have worked out how to persuade cells in inflamed tissues to believe that other cells nearby have just committed suicide. REST
Bio-inspired approach to RNA delivery
By delivering strands of genetic material known as messenger RNA (mRNA) into cells, researchers can induce the cells to produce any protein encoded by the mRNA. This technique holds great potential for administering vaccines or treating diseases such as cancer, but achieving efficient delivery of mRNA has proven challenging.
Now, a team of MIT chemical engineers, inspired by the way that cells translate their own mRNA into proteins, has designed a synthetic delivery system that is four times more effective than delivering mRNA on its own. REST
An easy to use, low-cost ‘NLISA’ platform for detecting biological signatures could shake up the way we monitor our health
By Kat J. McAlpine, Boston Children’s Hospital
(BOSTON) – Engineered strands of DNA — nanoscale tools called “nanoswitches” — could be the key to faster, easier, cheaper and more sensitive tests that can enable high-fidelity detection of biomarkers indicating the presence of different diseases, viral strains and even genetic variabilities as subtle as a single-gene mutation.
“One critical application in both basic research and clinical practice is the detection of biomarkers in our bodies, which convey vital information about our current health,” says Wesley Wong, PhD. “However, current methods tend to be either cheap and easy or highly sensitive, but generally not both.”
“We know that disease has a pattern of molecules in the breath. If you can detect these molecules, then you can associate them with a given disease. Dogs have a very sophisticated olfactory system; it’s 10,000 times more sensitive than ours. The Nanose started out as an idea to try to imitate the olfactory system of the dog – exactly on the same principles – and to make real-world applications with it. One of these applications is to smell disease through the breath.
“In our lab, we take the two main parts of the dog’s olfactory system, the receptors and the brain, and try to imitate them in an electrical way, using nanotechnology. The ultimate device is known as the Nano-Artificial Nose—the Nanose. Rest
Today networks of smart devices have already transformed our world, and we’re just starting to connect our bodies to them in meaningful ways. We see signs that we might be able to create new bio-based networks inside our own bodies and manipulate the ones already there.
As molecular biology, nanoscale engineering and robotics converge, we may be able to use microscopic robots to target specific interactions among many natural nanoscale processes within our bodies’ cells.
In the next few decades, communication technology could take on a whole new meaning, as we gain the ability to coordinate interactions among these tiny bio-nanobots and natural human bio-electrical functions.
IFTF researcher Michael Liebhold spoke with Dr. Ian Akyildiz, a preeminent researcher in nanoscale networks. A professor at Georgia Institute of Technology and founder of the Nano Communications Center, Dr. Akyildiz has established several highly regarded research centers. Rest