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Category: biotech/medical – Page 2,224

White House proposes guidelines for regulating the use of AI

The Trump administration is proposing new rules to guide future federal regulation of artificial intelligence used in medicine, transportation and other industries.

But the vagueness of the principles announced by the White House is unlikely to satisfy AI watchdogs who have warned of a lack of accountability as computer systems are deployed to take on human roles in high-risk social settings, such as mortgage lending or job recruitment.

The White House said that in deciding regulatory action, U.S. agencies “must consider fairness, non-discrimination, openness, transparency, safety, and security.” But federal agencies must also avoid setting up restrictions that “needlessly hamper AI innovation and growth,” reads a memo being sent to U.S. agency chiefs from Russell Vought, acting director of the Office of Management and Budget.

Here Are 5 Science-Backed Ways to Make Your Microbiome Healthier in 2020

It’s common for people to focus on their health at the start of the year.

But few consider the well being of the microbes that live inside the human gut – the microbiome – which are vital to an individual’s good health.

How important are these bacteria? There are as many bacterial cells in us as there are human cells, and they help control everything from inflammation and the development and treatment of cancer to how much energy we get from our foods and perhaps even what foods we crave and our moods.

Cancer-like metabolism makes brain grow

The size of the human brain increased profoundly during evolution. A certain gene that is only found in humans triggers brain stem cells to form a larger pool of stem cells. As a consequence, more neurons can arise, which paves the way to a bigger brain. This brain size gene is called ARHGAP11B and so far, how it works was completely unknown. Researchers at the Max Planck Institute of Molecular Cell Biology and Genetics in Dresden now uncovered its mode of action. They show that the ARHGAP11B protein is located in the powerhouse of the cell—the mitochondria—and induces a metabolic pathway in the brain stem cells that is characteristic of cancer cells.

The research group of Wieland Huttner, a founding director of the Max Planck Institute of Molecular Cell Biology and Genetics, has been investigating the underlying the expansion of the brain during mammalian evolution for many years. In 2015, the group reported a key role for a gene that is only present in humans and in our closest extinct relatives, the Neanderthals and Denisovans. This gene, named ARHGAP11B, causes the so-called basal brain stem to expand in number and to eventually increase the production of neurons, leading to a bigger and more folded brain in the end. How the gene functions within the basal brain stem cells has been unknown so far.

Takashi Namba, a postdoctoral scientist in the research group of Wieland Huttner, wanted to find the answer to this question, together with colleagues from the Max Planck Institute, the University Hospital Carl Gustav Carus Dresden, and the Department of Medical Biochemistry at the Semmelweis University, Budapest. He found that the ARHGAP11B protein is located in mitochondria, the organelles that generate most of the cell’s source of chemical energy and hence are often referred to as the powerhouse of the cell. Takashi Namba explains the results: We found that ARHGAP11B interacts with a protein in the membrane of mitochondria that regulates a membrane pore. As a consequence of this interaction, the pores in the membrane are closing up, preventing calcium leakage from the mitochondria. The resulting higher calcium concentration causes the mitochondria to generate chemical energy by a metabolic pathway called glutaminolysis.

The ‘Goldilocks’ principle for curing brain cancer

In the story of Goldilocks, a little girl tastes three different bowls of porridge to find which is not too hot, not too cold, but just the right temperature. In a study published in Advanced Therapeutics, University of Minnesota Medical School researchers report on a “Goldilocks” balance which holds the key to awakening the body’s immune response to fight off brain cancer.

The most common form of adult is glioblastoma. Doctors diagnose about 14,000 glioblastoma cases in the U.S. each year. This aggressive cancer has claimed the lives of Senators John McCain and Edward Kennedy.

“Our body has armies of white blood cells that help us fight off bacteria, viruses and cancer cells. This constellation of cells constitute our immune system,” said senior author Clark C. Chen, MD, Ph.D., Lyle French Chair in Neurosurgery and Head of the Department of Neurosurgery at the University of Minnesota Medical School. “One of the key reasons why glioblastoma is so aggressive is that it shuts off this immune system.”

Treating Glaucoma with Senolytics

New research suggests that senolytic drugs, which remove harmful senescent cells that accumulate during aging, may be an effective therapy for glaucoma, a common age-related condition that leads to loss of vision.

In the short term, inflammation serves a useful purpose, as it helps to spur the repair and regeneration of tissue and rallies the immune system to defend against marauding invaders.

However, the chronic, smoldering, low-grade inflammation that occurs during aging can be incredibly harmful. The sources of this “inflammaging,” as some researchers describe it, include (but are not limited to) dysfunctional immune cells, cell debris, disruption to the gut microbiome, and senescent cells. Today, we are concerned about the latter after the release of a new study focusing on senescent cells and glaucoma [1].

How Alzheimer’s disease could be cured by shining light directly into the brain

Alzheimer’s disease could be reversed by shining light directly into the brain through the nose and skull, scientists believe.

The first major trial to see if light therapy could be beneficial for dementia has just begun following astonishing early results which have seen people regain their memory, reading and writing skills, and orientation.

If successful it would be the first treatment to actually reverse the disease. So far, even the most hopeful drugs, such as Biogen’s aducanumab, have only managed to slow the onset of dementia, and many scientists had given up hope of reversing brain damage once it had already happened.