A team of Massachusetts General Hospital (MGH) investigators has made the first steps towards development of bioartificial replacement limbs suitable for transplantation They had used decellularization technique to regenerate kidneys, livers, hearts and lungs from animal models, but this is the first reported use to engineer the more complex tissues of a bioartificial limb.
They took the leg from recently deceased rat and then:
* Over a period of 52 hours, infusion of a detergent solution removes cells from a rat forelimb, leaving behind the cell-free matrix scaffolding onto which new tissues can be regenerated.
* it is put in a specially designed bioreactor and after 2 weeks it is recellularized
* they graft some skin onto the fledgling leg, and the doctors had themselves their own, home-grown rat limb (minus the bones and cartilage).
* they attached it to a rat
What if instead of taking the leg of dead rat you took the leg of an old rat and recellularized it with its own stem cells.
So if this process were made to work with humans, then all of the organs, limbs and muscles could be recellularized with youthful cells.
After vascular and muscle progenitors have been introduced into a decellularized rat limb, it is suspended in a bioreactor, which provides a nutrient solution and electrical stimulation to support and promote the growth of new tissues. (Bernhard Jank, MD, Ott Laboratory, Massachusetts General Hospital Center for Regenerative Medicine)
An old person who be placed into a bioreactor and progressively get every cell rejuvenated. This would be an expensive procedure but one that would only need to be performed once every 40-50 years.
You could have wearable bioreactors that work on rejuvenating different body parts. A few weeks rejuvenating each limb one at time, and then other body sections. Then a final rejevation of the core body in a whole body tube.
If you could control the locations of recellularization and progressively recellularize the whole body, then it would something like the Star Wars procedure for Luke Skywalker. An old person who be placed into a bioreactor and progressively get every cell rejuvenated
Could go the body transplant route but that is a lot of surgery
Italian surgeon Sergio Canavero announce a project perform a human head transplant at a keynote lecture at the American Academy of Neurological and Orthopaedic Surgeons annual conference this June. He sees the procedure as being possible as soon as 2017 and believes it should be pursued as a means of saving people with, say, multi-organ cancer.
He believes the patient would be able to speak in his own voice upon waking and that walking could be achieved within a year. “If society doesn’t want it, I won’t do it,” Canavero says. “But if people don’t want it in the US or Europe, that doesn’t mean it won’t be done somewhere else.
Most other surgeons do not believe the procedure will be successful.
New Scientist reports that Xiao-Ping Ren of Harbin Medical University in China recently showed that it is possible to perform a basic head transplant in a mouse. Ren will attempt to replicate Canavero’s protocol in the next few months in mice, and monkeys.
Ren’s approach, pioneered in mice, involves retaining the donor brain stem and transplanting the recipient head. Our preliminary data in mice support that this allows for retention of breathing and circulatory function. Critical aspects of the current protocol include avoiding cerebral ischemia through cross-circulation (donor to recipient) and retaining the donor brain stem. Successful clinical translation of AHBR will become a milestone of medical history and potentially could save millions of people. Ren’s mouse experiment confirmed a method to avoid cerebral ischemia during the surgery and solved an important part of the problem of how to accomplish long-term survival after transplantation and preservation of the donor brain stem.
Head Transplant Procedure
* The sharp severance of the cervical cords (donor’s and recipient’s), with its attendant minimal tissue damage
* The exploitation of the gray matter internuncial sensori-motor “highway” rebridged by sprouting connections between the two reapposed cord stumps. This could also explain the partial motor recovery in a paraplegic patient submitted to implantation of olfactory ensheathing glia and peripheral nerve bridges: A 2-mm bridge of remaining cord matter might have allowed gray matter axons to reconnect the two ends
* The bridging as per point 2 above is accelerated by electrical SCS straddling the fusion point
* The application of “fusogens/sealants”: Sealants “seal” the thin layer of injured cells in the gray matter, both neuronal, glial and vascular, with little expected scarring; simultaneously they fuse a certain number of axons in the white matter.
During CSA, microsutures (mini-myelorrhaphy) will be applied along the outer rim of the apposed stumps. A cephalosomatic anastomosee will thus be kept in induced coma for 3-4 weeks following CSA to give time to the stumps to refuse (and avoid movements of the neck) and will then undergo appropriate rehabilitation in the months following the procedure.
In addition, the immunosuppressant regime that will be instituted after CSA is expected to be pro-regenerative
In Place Recellularization with nanobot surgery
In a brief talk, Bachelet said DNA nanobots will soon be tried in a critically ill leukemia patient. The patient, who has been given roughly six months to live, will receive an injection of DNA nanobots designed to interact with and destroy leukemia cells—while causing virtually zero collateral damage in healthy tissue.
According to Bachelet, his team have successfully tested their method in cell cultures and animals and written two papers on the subject, one in Science and one in Nature.
Contemporary cancer therapies involving invasive surgery and blasts of drugs can be as painful and damaging to the body as the disease itself. If Bachelet’s approach proves successful in humans, and is backed by more research in the coming years, the team’s work could signal a transformational moment in cancer treatment.
If this treatment works this will be a medical breakthrough and can be used for many other diseases by delivering drugs more effectively without causing side effects.
2012 Video with answers from George Church, Ido Bachelet and Shawn Douglas on the medical DNA double helix clamshell nanobucket nanobot
George Church indicates the smart DNA nanobot has applications beyond nanomedicine. Applications where there is any need for programmable and targeted release or interaction at the cellular or near molecular scale.
2014 Geek Time Presentation from Ido Bachelet
At the British Friends of Bar-Ilan University’s event in Otto Uomo October 2014 Professor Ido Bachelet announced the beginning of the human treatment with nanomedicine. He indicates DNA nanobots can currently identify cells in humans with 12 different types of cancer tumors.
A human patient with late stage leukemia will be given DNA nanobot treatment. Without the DNA nanobot treatment the patient would be expected to die in the summer of 2015. Based upon animal trials they expect to remove the cancer within one month.
Within 1 or 2 years they hope to have spinal cord repair working in animals and then shortly thereafter in humans. This is working in tissue cultures.
Previously Ido Bachelet and Shawn Douglas have published work on DNA nanobots in the journal Nature and other respected science publications.
One Trillion 50 nanometer nanobots in a syringe will be injected into people to perform cellular surgery.
The DNA nanobots have been tuned to not cause an immune response.
They have been adjusted for different kinds of medical procedures. Procedures can be quick or ones that last many days.
Medicine or treatment released based upon molecular sensing – Only targeted cells are treated
Ido’s daughter has a leg disease which requires frequent surgery. He is hoping his DNA nanobots will make the type of surgery she needs relatively trivial – a simple injection at a doctor’s office.
We can control powerful drugs that were already developed
Effective drugs that were withdrawn from the market for excessive toxicity can be combined with DNA nanobots for effective delivery. The tiny molecular computers of the DNA nanobots can provide molecular selective control for powerful medicines that were already developed.
Using DNA origami and molecular programming, they are reality. These nanobots can seek and kill cancer cells, mimic social insect behaviors, carry out logical operators like a computer in a living animal, and they can be controlled from an Xbox. Ido Bachelet from the bio-design lab at Bar Ilan University explains this technology and how it will change medicine in the near future.
Ido Bachelet earned his Ph.D. from the Hebrew University in Jerusalem, and was a postdoctoral fellow at M.I.T. and Harvard University. He is currently an assistant professor in the Faculty of Life Sciences and the Nano-Center at Bar Ilan University, Israel, the founder of several biotech companies, and a composer of music for piano and molecules.
Researchers have injected various kinds of DNA nanobots into cockroaches. Because the nanobots are labelled with fluorescent markers, the researchers can follow them and analyse how different robot combinations affect where substances are delivered. The team says the accuracy of delivery and control of the nanobots is equivalent to a computer system.
This is the development of the vision of nanomedicine.
This is the realization of the power of DNA nanotechnology.
This is programmable dna nanotechnology.
The DNA nanotechnology cannot perform atomically precise chemistry (yet), but having control of the DNA combined with advanced synthetic biology and control of proteins and nanoparticles is clearly developing into very interesting capabilities.
“This is the first time that biological therapy has been able to match how a computer processor works,” says co-author Ido Bachelet of the Institute of Nanotechnology and Advanced Materials at Bar Ilan University.
The team says it should be possible to scale up the computing power in the cockroach to that of an 8-bit computer, equivalent to a Commodore 64 or Atari 800 from the 1980s. Goni-Moreno agrees that this is feasible. “The mechanism seems easy to scale up so the complexity of the computations will soon become higher,” he says.
An obvious benefit of this technology would be cancer treatments, because these must be cell-specific and current treatments are not well-targeted. But a treatment like this in mammals must overcome the immune response triggered when a foreign object enters the body.
Bachelet is confident that the team can enhance the robots’ stability so that they can survive in mammals. “There is no reason why preliminary trials on humans can’t start within five years,” he says
Biological systems are collections of discrete molecular objects that move around and collide with each other. Cells carry out elaborate processes by precisely controlling these collisions, but developing artificial machines that can interface with and control such interactions remains a significant challenge. DNA is a natural substrate for computing and has been used to implement a diverse set of mathematical problems, logic circuits and robotics. The molecule also interfaces naturally with living systems, and different forms of DNA-based biocomputing have already been demonstrated. Here, we show that DNA origami can be used to fabricate nanoscale robots that are capable of dynamically interacting with each other in a living animal. The interactions generate logical outputs, which are relayed to switch molecular payloads on or off. As a proof of principle, we use the system to create architectures that emulate various logic gates (AND, OR, XOR, NAND, NOT, CNOT and a half adder). Following an ex vivo prototyping phase, we successfully used the DNA origami robots in living cockroaches (Blaberus discoidalis) to control a molecule that targets their cells.
Ido Bachelet’s moonshot to use nanorobotics for surgery has the potential to change lives globally. But who is the man behind the moonshot?
Ido graduated from the Hebrew University of Jerusalem with a PhD in pharmacology and experimental therapeutics. Afterwards he did two postdocs; one in engineering at MIT and one in synthetic biology in the lab of George Church at the Wyss Institute at Harvard.
Now, his group at Bar-Ilan University designs and studies diverse technologies inspired by nature.
They will deliver enzymes that break down cells via programmable nanoparticles.
Delivering insulin to tell cells to grow and regenerate tissue at the desired location.
Surgery would be performed by putting the programmable nanoparticles into saline and injecting them into the body to seek out remove bad cells and grow new cells and perform other medical work.
Nanoparticles with computational logic has already been done
Load an ensemble of drugs into many particles for programmed release based on situation that is found in the body
Brian Wang is a Futurist Thought Leader and a popular Science blogger with 1 million readers per month. His blog Nextbigfuture.com is ranked #1 Science News Blog. It covers many disruptive technology and trends including Space, Robotics, Artificial Intelligence, Medicine, Anti-aging Biotechnology, and Nanotechnology.
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