Uncovering new details of the brain’s first line of defense: Researchers report in unprecedented detail how some of the brain’s immune cells develop, and how to distinguish them from other cells

Thanks to over a century of modern neuroscience, we have made significant strides in our understanding of the brain. Nonetheless, we have only just begun to scratch the surface of how this amazingly complex organ works.

Digging deeper into this perplexing puzzle, researchers from Kyushu University’s Faculty of Pharmaceutical Sciences have now analyzed in unprecedented detail the development and genetic profile of a set of cells that construct the brain’s immune system.

Their new insights, published in the journal Nature, could pave the way for better understanding the origins and mechanisms behind leading brain-related pathologies such as Alzheimer’s disease and multiple sclerosis.

“Many people are familiar with how neurons connect together to send signals across the brain, but there are also blood vessels that supply the brain with oxygen, and glial cells that act as the brain’s support network and immune system,” explains Takahiro Masuda, who led the study. “In fact, even the most generous estimates suggest only about half of the cells in our brains are neurons, so studying the other cells is just as vital for uncovering how the brain works.”

With this in mind, the research team has been focusing on a series of cells called ‘central nervous system associated macrophages’ a type of immune cells that protect the brain from infection. These macrophages are thought to be involved in almost all known neurodegenerative diseases due to their critical role as the immune cells of the brain.

Over the years, research has shown that many different kinds of these cells exist. For this study, the team was particularly interested in the macrophages surrounding blood vessels and those located in the meninges — the layers that surround the brain — known as ‘perivascular macrophages’ and ‘meningeal macrophages,’ respectively.

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