astrocytes

Backed by a $1 million grant, researchers at Case Western Reserve University in Ohio will explore ways to keep astrocytes in check, protecting the nervous system from damage due to multiple sclerosis (MS). These star-shaped cells of the brain and spinal cord go awry and become toxic in this…

Bit.bio, a company that creates human-derived cell products, has launched a novel product called ioAstrocytes, which provides functional human astrocytes to help scientists model the brain and study neurological disease mechanisms or screen new drugs. Astrocytes are star-shaped cells in the brain and spinal cord that provide support…

A subset of astrocytes — a type of support cell for the central nervous system — has a form of immune-related memory that might contribute to a worsening of multiple sclerosis (MS), according to recent research. Much like immune cells, these astrocytes can remember inflammatory stimuli that they previously have…

Activating certain receptors on astrocytes — a type of nerve support cell — may offer a way of treating cognitive problems in multiple sclerosis (MS), according to recent research. MS mouse models genetically engineered to lack these receptors, called TNFR2, showed signs of greater cognitive problems, whereas cognitive gains…

Using a new approach, researchers have identified new signaling molecules that regulate the activation of certain subsets of astrocytes thought to drive inflammation in multiple sclerosis (MS). The new methodology, called FIND-seq, enables the selection of single cells from a sample based on the expression of specific genes and…

The experimental therapy XPro1595 was found to promote remyelination — the repair of the myelin sheath — in a mouse model of myelin loss, new data show. Myelin, the fatty covering that helps nerve fibers send electrical signals, is damaged by the immune system in …

A matrix protein called fibulin-2, which is increased in multiple sclerosis (MS) lesions, blocks the activity of oligodendrocytes, the cells responsible for making myelin. Blocking this protein may be a promising approach to restore myelin in people with the neurodegenerative disease, a study in mice showed. The data was…

An interaction between immune cells and glia cells in the brain, mediated by the C1q complement system protein, appears to drive chronic inflammation in multiple sclerosis (MS), new research shows. Inhibiting this protein helped to resolve inflammation in mouse models of MS and in tissue cultures, its researchers found.

Sustained, excessive levels of interleukin 17A (IL-17A) — a pro-inflammatory molecule linked to multiple sclerosis (MS) and other autoimmune diseases — reduce the number and activity of the brain’s immune cells in the dentate gyrus, according to a study in mice. The dentate gyrus is part of the hippocampus, a…

A newly identified subset of astrocytes — cells long thought to be responsible for simply providing nutrition and support to neurons — can prevent brain inflammation by promoting the destruction of pro-inflammatory immune T-cells, scientists report. Their work also found that the anti-inflammatory activity of this astrocyte subpopulation is dependent on…

An inflammatory environment can turn astrocytes, key supportive cells for neurons, into their killers, fostering the progression of neurodegenerative diseases like multiple sclerosis (MS), a new study shows. This work, led by researchers at the New York Stem Cell Foundation (NYSCF), created for a first time astrocytes derived…

Using brain tissue from people with multiple sclerosis (MS) and mouse models of MS, scientists identified a key pathway that drives astrocytes to promote inflammation in the brain and spinal cord. The study, “MAFG-driven astrocytes promote CNS inflammation” published in the journal Nature, uncovered potential therapeutic targets that may be…

Blocking a protein called PAR1 may enhance the regeneration of myelin, the protective fatty layer that covers nerve fibers and is damaged in multiple sclerosis (MS), a mouse study shows. Therapeutic targeting of PAR1 may promote remyelination and delay MS progression, according to the study, “Blocking the Thrombin Receptor…

Processes related to metabolism in brain cells known as astrocytes may be at the origin of multiple sclerosis (MS), particularly underlying the inflammation and damage to the nervous system seen in progressive disease, a study in mice found.

A protein known as nuclear factor I-A (NFIA) is key for spinal cord repair and timely remyelination by astrocytes — the most abundant cells in the brain and first responders to sites of injury, findings in a mouse model of multiple sclerosis (MS) suggest. In brain lesions, NFIA is…

Oligodendrocyte precursor cells (OPCs), the cells responsible for myelin production, are unable to migrate into sites of myelin loss in the brain. These cells then cluster and disrupt the blood-brain barrier (BBB), triggering an inflammatory process in the early stages of multiple sclerosis (MS), a study shows. The study, “Aberrant oligodendroglial–vascular interactions disrupt the blood–brain barrier, triggering CNS inflammation,” was published in the journal Nature Neuroscience. MS is an autoimmune disease characterized by the loss of myelin (demyelination) — the fat-rich substance that protects nerve fibers — which leads to neurodegeneration. Along with loss of myelin, researchers have observed that the blood-brain barrier — a highly selective membrane that shields the central nervous system with its cerebrospinal fluid from the general blood circulation — breaks down in the initial stages of disease. A team led by researchers at the University of California, San Francisco, have now discovered that OPCs are involved in the disruption of the blood-brain barrier in MS, according to a press release from the National MS Society, which funded the study. Oligodendrocytes are myelin-producing cells and are responsible for myelinating the nerve cells’ axons — a single oligodendrocyte is capable of myelinating multiple axons. Mature myelin-producing oligodendrocytes develop from more immature, stem cell-like OPCs. In a normal brain, upon myelin loss, OPCs are called into action and travel into the damage site where they mature and generate myelin-producing oligodendrocytes. In this study, the researchers found that OPCs in MS form clusters in blood vessels of the brain-blood barrier, having lost the ability to detach from these vessels and migrate to injury sites. In an animal model of MS, they saw that OPC aggregates altered the location of other cells — called astrocytes — in a competition for space, and contributed to the disruption of blood vessels. Astrocytes are a group of star-shaped cells, belonging to the group of glial cells, that provide neurons with energy, and work as a platform to clean up their waste. They also have other functions within the brain, such as regulating blood flow and inflammation. The team also observed that OPC aggregates trigger an immune inflammatory response, shown by a large number of microglia (the central nervous system immune cells) and immune cells called macrophages around these cell clusters. “We find in several MS cases, in lesion areas with active inflammation, that OPCs can be found clustered on vasculature, representing a defect in single cell perivascular migration and inability to detach from blood vessels,” the researchers wrote. Further molecular analysis revealed that OPCs have high levels of Wnt signaling, and elevated secretion of Wif1 factor to the extracellular space that could explain why OPCs accumulate and destroy the blood-brain barrier. The WiF1 factor is actually a negative regulator of Wnt signaling that is essential for the maintenance of the blood-brain barrier structure. This factor competes with Wnt ligands, and affects the integrity of cellular junctions, making the blood-brain barrier more fragile and permeable. "Evidence for this defective oligodendroglial–vascular interaction in MS suggests that aberrant OPC perivascular migration not only impairs their lesion recruitment but can also act as a disease perpetuator via disruption of the BBB,” the researchers wrote. They suggested that more studies are needed to better understand the interactions between blood vessels and oligodendrocytes, which could help identify new therapeutic targets for promoting myelin repair in MS.

Editor’s note: “Need to Know” is a series inspired by common forum questions and comments from readers. Have a comment or question about MS? Visit our forum. This week’s question is inspired by the forum topic “New MS Therapy Company to Focus on Rejuvenating Coating…

Stem cells tweaked in the laboratory have allowed researchers, reportedly for a first time, to generate and maintain ball-shaped cultures — called spheroids — of human brain cells in 3D that contain oligodendrocytes, the cells that produce myelin, along with neurons and the astrocytes that are essential to nerve cell health.

A genetic variant associated with an increased risk of multiple sclerosis (MS) due to its impact on certain immune system cells can also affect brain cells called astrocytes, a study shows. Reported in the study, “Enhanced astrocyte responses are driven by a genetic risk allele associated with multiple…

Myelin loss might be prevented by astrocytes, a brain cell that regulates myelin’s thickness in coating nerve fibers to support the proper transmission of nerve signals, after astrocytes were seen to block an enzyme called thrombin in a study from the National Institutes of Health (NIH). Its…

A molecule known as Sox10 enables brain cells called astrocytes to convert into myelin-forming oligodendrocytes, a new study in mice reports. The findings suggest an approach for myelin repair in patients with multiple sclerosis (MS) and similar disorders, its researchers said. The study, “In vivo conversion of…

Researchers have created a detailed map of the mouse nervous system, including the location of the many diverse cell types in the brain, in the largest study yet of the makeup of the mammalian nervous system.  The new map could provide new clues about the origin of neurological…

Metabolites produced by microbes in the gut can ease inflammation in the central nervous system by limiting the damage done by microglia, an immune cell of the brain, an early study reports. Its scientists suggest this gut-brain axis may open new avenues to treatment. “These findings provide a clear understanding of how…

United Arab Emirates scientists have found active Epstein-Barr virus in many multiple sclerosis patients’ brain cells, supporting the notion that it plays a role in the disease. The team found it in two types of brain cells — astrocytes and microglia. The virus can be active or lie dormant in…

Tailored molecular treatments for specific disabilities may be a breakthrough for multiple sclerosis (MS) patients, finds a new study by researchers at University of California-Los Angeles (UCLA). The study, “Cell-specific and region-specific transcriptomics in the multiple sclerosis model: Focus on astrocytes,” appeared in the journal Proceedings…

Researchers at The Salk Institute have developed a way to grow vital brain cells called astrocytes from stem cells, a potential breakthrough for basic and clinical research into several diseases, including multiple sclerosis (MS). The study “Differentiation of Inflammation-responsive Astrocytes from Glial Progenitors Generated from Human Induced Pluripotent…

MS brain inflammation is a result of interactions between processes in the brain and the rest of the body, with interferon-gamma (IFN-gamma) being a key player, according to a detailed analysis of cytokines in the spinal fluid and serum of MS patients. Russia’s Kazan Federal University found that IFN-gamma activates other…

The United States has granted a patent to Kadimastem’s stem cell-based technology for treating multiple sclerosis (MS) and other diseases of the nervous system. The patent involves the technology the company used to produce supporting cells in the central nervous system derived from human stem cells, including myelin-producing cells. The United…

Gilenya (fingolimod) a multiple sclerosis (MS) drug developed to target the immune system and control inflammation, can also reduce the negative action of astrocytes, further controlling inflammation, says a new study. The article, “Sphingosine 1-Phosphate Receptor Modulation Suppresses Pathogenic Astrocyte Activation and Chronic Progressive CNS Inflammation,” appeared in the…

In what may be one of the most significant discoveries in neurodegenerative disease, researchers have found that brain cells, called astrocytes, contribute to killing neurons and myelin-forming oligodendrocyte cells, which may drive neurodegenerative diseases such as multiple sclerosis (MS). Experiments indicate an aggressive astrocyte type kills cells by secreting a yet-unidentified…