BioQuakes

AP Biology class blog for discussing current research in Biology

Author: isabellularrespiration

LION: The King Of The COVID Vaccines

As the SARS-CoV-2 virus (also known as COVID-19) continues to rage across the world killing millions, more time, effort, and money is being put into researching the best vaccines to help bring the world back to a state of normalcy.  One such vaccine is being developed at the University of Washington using replicating RNA is called LION (Lipid InOrganic Nanoparticle). In its animal trials in July, the vaccine already found some success inducing “coronavirus-neutralizing antibodies” in mice young and old which has given researchers a lot of hope for the future of the vaccine.

 

One might wonder, why do we need a vaccine at all? Vaccines are used to expose your body to small doses of a virus or in this case by mRNA, which teaches your body to produce the antibodies needed to fight the virus and makes memory cells. The next time you are exposed to the virus, your body will be able to produce the necessary antibodies to a much larger degree, much quicker, for longer so you will be protected from becoming sick.

One of the lead researchers on LION, Professor Deborah Fuller of the University of Washington School of Medicine qualified the goals of a successful COVID-19 vaccine saying it, “will ideally induce protective immunity after only a single immunization, avoid immune responses that could exacerbate virus-induced pathology, be amenable to rapid and cost-effective scale-up and manufacturing, and be capable of inducing immunity in all populations including the elderly who typically respond poorly to vaccines.” This is quite a lot to accomplish but LION lends itself very well to these goals, conquering most of the problems a typical DNA vaccine would have. DNA vaccines work by coding for the antigens which are then exposed to the immune system to create memory cells so the body can treat the virus later. The downsides of a DNA vaccine is sometimes those antigens fail to create an immune response or can even cause the cell to become cancerous when the DNA joins the host cells DNA, disrupting it. There is far less risk with RNA vaccines which occupy the cytoplasm and only interact with ribosomes.

Shown above us a basic drawing of what SARS-CoV-2 virus looks like.

LION is a replicating RNA vaccine, but how does replicating RNA work? RNA codes for spike proteins and ribosomes in the body make the necessary proteins. Replicating RNA allows for more spike proteins and ribosomes to be coded at a greater rate, which produces a greater number of proteins continuously while triggering “a virus-sensing stress response that encourages other immune activation.” For the vaccine the RNA replicates proteins that tell the body to reject the SARS-CoV-2 and attack them “with antibodies and T cells”  which stop the protein spikes on the virus from interfering with the cell. The development of B cells, which remember how to make the antibodies to fight the virus when infected again, as well as T cells is especially critical for the vaccine as they can develop immunity to the SARS-CoV-2 antigens. What makes the LION vaccine special is the nanoparticle it is named after which “enhances the vaccine’s ability to provoke the desired immune reaction, and also its stability.” This makes it more valuable than other vaccines of the same kind as it can achieve effective results with a longer shelf life. It can also be mixed simply using a two vial method as the mRNA component is made separately from the main vaccine formulation. For all these reasons, the scientists are optimistic as the vaccine goes into the next stages of testing that this vaccine could help provide a long term solution to the COVID-19 pandemic.

As COVID-19 vaccines start becoming available to essential workers in the coming weeks and my father prepares to take one, it can be quite unnerving to think about all the potential negative side effects of the vaccine. These vaccines have been developed without the typical ten years of testing, so knowing more about the research behind the vaccines serves as a comfort me and many others. Our future is in these vaccines and research so knowing which we should invest our time and money in is always a good idea.

How a Rogue Protein can cause Alzheimer’s Disease

In a study done by NYU Langone Healthy and the School of Medicine, researchers learned more about the types of proteins that cause the tangles in the brain that cause Alzheimer’s. Alzheimer’s disease is a type of dementia that affects the “memory, thinking, and behavior” of the over 5 million Americans who have it, according the the Alzheimer’s Association. The researchers tested tissue sample of 12 subjects with the disease looking for tau knots to “[examine] the bundles to identify the many proteins tangled within”.

File:Histopathology of neurofibrillary tangles in Alzheimer's disease.jpg

Shown is the tangles that are found in and contribute to Alzheimer’s disease 

You might be wondering, what is a tau knot? A tau is a protein that exists mostly in nerves that has the objective of stabilizing microtubules. When this protein is defective, it can become tangled with other molecules which leaders to Alzheimer’s disease.

Although neuroscientists already knew that tau tangles can cause neurodegenerative diseases like Alzheimer’s or dementia, they did not know many of the proteins that cause these dangerous knots. After analyzing the brain tissue, the researchers “found 12 proteins that they say have not before been tied to both tau and Alzheimer’s disease.” These knots were made up of 542 different proteins including those involved in the most essential processes of the cell like “energy production”, “the reading of genetic material”, “and cell breakdown and digestion.” These proteins that work to produce ATP and RNA in the processes of cell respiration and gene transcription (which are necessary parts of cell function); these important proteins are involved in the knotting. It is crazy that along with their existence comes the possibility of them destroying all they have created.

Despite the sad nature of this research, this new information comes along with hope for those suffering from this debilitating illness. According to co-lead author Geoffrey Pires, “Now that we have better insight into possible ‘key players’ in neurodegeneration, we may have clearer targets for potential therapies.” As these researchers gain more and more information, they gain a better understanding of Alzheimer’s and in turn, other similar “tau-linked neurodegenerative diseases, such as Pick’s disease.”

I feel Alzheimer’s is an essential disease to learn more about not only because it is incurable and unpreventable, but because 4 members of my own family have suffered from it. As the study’s senior author Thomas Wisniewski said “Alzheimer’s has been studied for over a century, so it is eye opening that we are still uncovering dozens of proteins that we had no idea are associated with the disease.” It is wild to think that something so common and well known, still has so many mysteries to it and that makes it immensely more fascinating and important to learn about.

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