Deans' stroke musings

Changing stroke rehab and research worldwide now.Time is Brain!Just think of all the trillions and trillions of neurons that DIE each day because there are NO effective hyperacute therapies besides tPA(only 12% effective). I have 493 posts on hyperacute therapy, enough for researchers to spend decades proving them out. These are my personal ideas and blog on stroke rehabilitation and stroke research. Do not attempt any of these without checking with your medical provider. Unless you join me in agitating, when you need these therapies they won't be there.

What this blog is for:

Shortly after getting out of the hospital and getting NO information on the process or protocols of stroke rehabilitation and recovery I started searching on the internet and found that no other survivor received useful information. This is an attempt to cover all stroke rehabilitation information that should be readily available to survivors so they can talk with informed knowledge to their medical staff. It's quite disgusting that this information is not available from every stroke association and doctors group.
My back ground story is here:http://oc1dean.blogspot.com/2010/11/my-background-story_8.html

Thursday, April 20, 2017

Nanoparticle nasal spray may offer rapid and safe delivery of drugs to the brain

This has 13 other nasal options, which ones is your hospital testing?

Using nanoparticles, not needles, to deliver drugs into the eye  - 13 options

The latest here:

Nanoparticle nasal spray may offer rapid and safe delivery of drugs to the brain 




Traversing the blood-brain barrier is a challenge for drug developers. Now, after testing the method in locusts, a team of engineers shows how an aerosol nasal spray containing gold nanoparticles may offer a non-invasive and rapid way to deliver drugs to the brain.

realistic brain illustration
Researchers suggest that delivering drugs to the brain using nanoparticles in a nasal spray could be an effective and rapid method capable of overcoming the problem of traversing the blood-brain barrier.
The team - from the University of Washington in St. Louis (WUSTL), MO - describes the proof-of-concept research in the journal Scientific Reports.
For the brain to function, it must operate in a tightly controlled chemical environment that is protected from the more varied fluctuations of the rest of the body.
This stable environment is maintained by the blood-brain barrier, which comprises layers of specialized cells in the inner linings of the small blood vessels in the brain and spinal cord.
The blood-brain barrier prevents toxins from entering the tissues of the brain and spinal cord. Unfortunately, it does the job so well that it also keeps out many drugs, such as those used to kill cancer cells.
One way to overcome this is to deliver drugs to the brain using injections. However, such invasive approaches are risky in that they can damage tissue and have little control over the distribution of the drugs from the point of injection, note the study researchers.
Thus, in a bid to find an effective and less risky alternative, the WUSTL team decided to explore the potential of using nanoparticles to carry drugs to the brain through the nose.

Nose offers easy access to the brain

Interest in using nanotechnology - the ability to control matter at the atomic and molecular scale - to develop new diagnostic tools and treatments is growing, note the authors in their study report.
A number of new nanomaterials have been used to carry drugs to specific targets in organs and tissues. These appear to maximize drug effectiveness while minimizing side effects.
Co-author Barani Raman, associate professor of biomedical engineering, says that the nose offers the shortest - and most likely the easiest - route to the brain.
He and his colleagues note that from various studies, gold nanoparticles have emerged as the material of choice for drug delivery. They are relatively easy to synthesize and customize, and they have good biocompatibility.
The team developed a new aerosol diffusion method that deposits gold nanoparticles in the upper regions of the nasal cavity. They produced the nanoparticles to a controlled shape, size, and surface charge, and tagged them with fluorescent markers so that they could track them.

Locusts offer a good model of the human blood-brain barrier

The researchers tested the effectiveness of the nanoparticle aerosol in locusts because their blood-brain barriers bear similarities to those of humans - especially when going through the nasal route.
Prof. Raman explains that in humans, to reach the brain through the nose, the nanoparticles have to travel through the olfactory bulb and then the olfactory cortex, "two relays and you've reached the cortex," he says.
"The same is true for invertebrate olfactory circuitry," he adds, "although the latter is a relatively simpler system, with [a] supraesophageal ganglion instead of an olfactory bulb and cortex."
The team exposed the locusts' antennae to the aerosol and tracked the progress of the tagged nanoparticles. Within a few minutes, the nanoparticles had traversed the insects' olfactory circuitry, passed through the brain-blood barrier, and suffused the brain tissue.
The team showed that the nanoparticles did not affect the insects' brain function. They measured the electrophysiological responses of the locusts' olfactory neurons before and after treatment and found no discernible difference up to several hours afterwards.
The researchers say that the next stage of their research will be to load the nanoparticles with different drugs and use ultrasound to target precise doses to reach specific areas of the brain. Such methods could potentially make a big difference to the treatment of brain tumors.

 

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