The Brain's Most Ubiquitous Cell, the Astrocyte, Mass Produced in the Lab

Long thought to be little more than clay in the brain and spinal cord, the star-shaped astrocyte has found new significance among neuroscientists who have begun to recognize its many functions in the brain, in addition to its role in a range of disorders of the central nervous system.

Now, an article published in the May 22, 2011, issue of the journal Nature Biotechnology, a group led by University of Wisconsin (UW)-Madison (USA) stem cell researcher Dr. Su-Chun Zhang reported the group has been able to direct embryonic- and induced-human stem cells to become astrocytes in the lab dish.

The ability to make large, uniform batches of astrocytes, explained Dr. Zhang, provides a new way to more fully determining the functional roles of the brain's most ordinary cell, as well as its involvement in a variety of central nervous system disorders ranging from headaches to dementia. Moreover, the ability to culture the cells gives researchers a powerful tool to devise new therapies and drugs for neurologic disorders.

"Not a lot of attention has been paid to these cells because human astrocytes have been hard to get," said Dr. Zhang, a researcher at UW-Madison's Waisman Center and a professor of neuroscience in the UW-Madison School of Medicine and Public Health. "But we can make billions or trillions of them from a single stem cell."

Although astrocytes have gotten short shrift from science compared to neurons, the large filamentous cells that process and transmit information, scientists are turning their attention to the more common cells, as their roles in the brain become better understood. There are a variety of astrocyte cell types and they perform such essential housekeeping tasks as helping to regulate blood flow, soaking up excess chemicals produced by interacting neurons and controlling the blood-brain barrier, a protective filter that keeps dangerous molecules from entering the brain.

Astrocytes, some studies suggest, may even play a role in human intelligence, because their volume is much greater in the human brain than any other species of animal. "Without the astrocyte, neurons can't function," Dr. Zhang notes. "Astrocytes wrap around nerve cells to protect them and keep them healthy. They participate in virtually every function or disorder of the brain."

The ability to generate astrocytes in the lab has several potential useful outcomes, according to Dr. Zhang. They could be used as screens to identify new drugs for treating diseases of the brain, they can be used to model disease in the lab dish and, in the more distant future, it may be possible to transplant the cells to treat a variety of neurologic disorders, including Parkinson's disease, brain trauma, and spinal cord injury. It is possible that astrocytes prepared for clinical use could be among the first cells transplanted to intervene in a neurologic condition as the motor neurons affected by the fatal amyotrophic lateral sclerosis, also known as Lou Gehrig's disease, are swathed in astrocytes. "With an injury or neurological condition, neurons in the brain have to work harder, and doing so they make more neurotransmitters," chemicals that in excess can be toxic to other cells in the brain, Dr. Zhang stated. "One idea is that it may be possible to rescue motor neurons by putting normal, healthy astrocytes in the brain. These cells are really useful as a therapeutic target.

The technology developed by the Wisconsin group provides a foundation to make all the different species of astrocytes. Moreover, it is possible to genetically modify them to mimic disease so that previously inaccessible neurologic disorders can be studied in the laboratory.

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