Stress Hormone Helps Brain Repair Itself After Injury

Topic: Biology

Researchers found that a stress hormone called CRH helps the brain repair itself after injury. They discovered this by studying mice with brain damage and observing how their brains responded to injury. The study shows that CRH plays an important role in controlling the timing of myelin repair.

Scientists at the Max Planck Institute of Psychiatry studied what happens when laboratory mice experience brain damage. They noticed that a certain group of cells, called oligodendrocyte progenitor cells (OPCs), appear and become active around the damaged area.

These OPCs can mature into oligodendrocytes, which produce the myelin sheath surrounding axons. Myelin acts like insulation for electrical cables, allowing neurons to communicate efficiently with each other. Damage to myelin can have serious consequences, such as in autoimmune diseases like multiple sclerosis (MS).

Researchers Clemens Ries and Jan Deussing discovered that OPCs multiply dramatically around the edges of brain wounds and eventually become oligodendrocytes capable of producing new myelin. However, they also found something surprising: near the damaged tissue, about one third of the OPCs activate corticotropin-releasing hormone (CRH), a hormone that plays a central role in regulating the body's stress response.

The CRH response begins quickly, within just a few hours after an injury. However, it shuts down again after roughly three days. This short and rapid burst suggests that CRH has an important function during the earliest stages of the healing response.

Why It Matters

Understanding how the brain repairs itself can lead to new treatments for brain injuries and diseases like multiple sclerosis. This research also shows that stress hormones play a crucial role in controlling the timing of myelin repair, which is essential for proper brain function.

Key Facts

• Researchers at the Max Planck Institute of Psychiatry studied laboratory mice with brain damage to understand how the brain repairs itself.
• Oligodendrocyte progenitor cells (OPCs) multiply dramatically around the edges of brain wounds and eventually become oligodendrocytes capable of producing new myelin.
• About one third of OPCs activate corticotropin-releasing hormone (CRH), a hormone that plays a central role in regulating the body's stress response, near the damaged tissue.
• The CRH response begins quickly, within just a few hours after an injury, and shuts down again after roughly three days.
• This research shows that CRH helps control the timing of myelin repair, which is essential for proper brain function.

Key Terms

Oligodendrocyte Progenitor Cells (OPCs)

Cells that can mature into oligodendrocytes and produce the myelin sheath surrounding axons.

Corticotropin-Releasing Hormone (CRH)

A hormone that plays a central role in regulating the body's stress response.

Implications

Understanding how the brain repairs itself can lead to new treatments for brain injuries and diseases like multiple sclerosis. This research also shows that stress hormones play a crucial role in controlling the timing of myelin repair, which is essential for proper brain function.