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Reflecting on Two Years of Discovery and Looking Ahead to New NIH Leadership

As I transition from my role as the Acting NIH Director, I’d like to thank you, the readers, for visiting the NIH Director’s Blog ever since I took the helm 22 months ago. From Long COVID to the opioid overdose epidemic to Alzheimer’s disease—we’ve covered a range of diseases and conditions, scientific advances, and programs. You were able to read about such a broad spectrum of science thanks in large part to the many Institute Directors at NIH who authored guest posts. I hope the blog has helped you learn more about what NIH does and the many ways that biomedical research impacts human health.

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How Double-Stranded RNA Protects the Brain Against Infection While Making Damaging Neuroinflammation More Likely

When you get a run-of-the-mill viral infection, after a few days of symptoms your immune system typically fends off the bug, and you’ll make a full recovery. In rare cases, a virus can infect the brain. This can lead to much bigger problems, including cognitive impairments known as “brain fog,” other neuropsychiatric symptoms, potentially irreversible brain damage, or even death. For this reason, the brain, more than other parts of the body, relies heavily on immune responses that can control viral infections immediately.

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Brain Atlas Paves the Way for New Understanding of How the Brain Functions

When NIH launched The BRAIN Initiative® a decade ago, one of many ambitious goals was to develop innovative technologies for profiling single cells to create an open-access reference atlas cataloguing the human brain’s many parts. The ultimate goal wasn’t to produce a single, static reference map, but rather to capture a dynamic view of how the brain’s many cells of varied types are wired to work together in the healthy brain and how this picture may shift in those with neurological and mental health disorders.

So I’m now thrilled to report the publication of an impressive collection of work from hundreds of scientists in the BRAIN Initiative’s Cell Census Network (BICCN), detailed in more than 20 papers in Science, Science Advances, and Science Translational Medicine.1Among many revelations, this unprecedented, international effort has characterized more than 3,000 human brain cell types. To put this into some perspective, consider that the human lung contains 61 cell types.2 The work has also begun to uncover normal variation in the brains of individual people, some of the features that distinguish various disease states, and distinctions among key parts of the human brain and those of our closely related primate cousins.