- Introduction to Clinical Research Training
- Medical Education
- United Kingdom Clinical Scholars Research Training
- Vanderbilt Hall
- Financial Aid
- Office of the Registrar
- Campus Planning and Facilities
- Ombuds Office
- Committee on Microbiological Safety
- Human Resources
- HMS Foundation Funds
- Office for Academic and Clinical Affairs
- Joint Committee on the Status of Women
- The Academy
- Global Health Research Core
- Global Clinical Scholars Research Training Program
- HMA Standing Committee on Animals
- Office of Research Compliance
- Global & Community Health
- Harvard Medical School Event Calendar
- Contact @HMS
- Office of Diversity RIA Program
- The Dean's Perspective
- Department of Pathology
- Harvard Mahoney Neuroscience Institute
- OHRA Home
- Office of Research Subject Protection
- Tools and Technology
- Alumni Association
- Cancer Biology & Therapeutics Program
- Celiac Program
- Department of Medicine
- HMS Community Values Initiative
- HMS Information Technology
- IT News & Announcements
- Educational Technology
- Student Computing
- IT Service Catalog
- Accounts & Access
- Administrative Applications
- Centralized End User Backup
- Computers & Software
- Email & Calendar
- Mobile Computing
- Network & Wireless
- Storage & Servers
- Training & Consulting
- Web & Collaboration
- Office 365
- Media Services
- Research Computing
- Research Imaging Solutions
- Research Information Technology Solutions
- Safe Computing
- Get Help
- HMS TransMed Program
- Introduction to the Practice of American Medicine
- Office of Communications & External Relations
- Office of Global Education
- Shenzhen-HMS Initiative in International Education
- South American Clinical Research Training
- test page
- Safety Quality and Informatics Leadership
- Human Resources
- Jobs @ HMS
- Contact us
- Dental Medicine
- Harvard University
Exercising the Mind
October 10, 2013
A protein increased by endurance exercise has been isolated and given to non-exercising mice, turning on genes that promote brain health and encourage the growth of new nerves involved in learning and memory, scientists from Harvard Medical School and Dana-Farber Cancer Institute have reported.
The findings, published in the journal Cell Metabolism, help explain the well-known capacity of endurance exercise to improve cognitive function, particularly in older people. If the protein can be made in a stable form and developed into a drug, it might lead to improved therapies for cognitive decline in older people and slow the toll of neurodegenerative diseases such Alzheimer’s and Parkinson’s, according to the investigators.
“What is exciting is that a natural substance can be given in the bloodstream that can mimic some of the effects of endurance exercise on the brain,” said Bruce Spiegelman, the HMS Stanley J. Korsmeyer Professor of Cell Biology and Medicine at Dana-Farber. He is co-senior author of the publication with Michael Greenberg, the Nathan Marsh Pusey Professor of Neurobiology and head of the Department of Neurobiology at HMS.
The Spiegelman group previously reported that the protein, called FNDC5, is produced by muscular exertion and is released into the bloodstream as a variant called irisin. In the new research, endurance exercise—mice voluntarily running on a wheel for 30 days—increased the activity of a metabolic regulatory molecule, PGC-1α, in muscles, which spurred a rise in FNDC5 protein. The increase of FNDC5 in turn boosted the expression of a brain-health protein, BDNF (brain-derived neurotrophic protein) in the dentate gyrus of the hippocampus, a part of the brain involved in learning and memory.
It has been found that exercise stimulates BDNF in the hippocampus, one of only two areas of the adult brain that can generate new nerve cells. BDNF promotes the development of new nerves and synapses—connections between nerves that allow learning and memory to be stored—and helps preserve existing brain cells.
How exercise raises BDNF levels in the brain wasn’t known; the new findings linking exercise, PGC-1α, FNDC5 and BDNF provide a molecular pathway for the effect, although Spiegelman and his colleagues suggest there are probably others.
Having shown that FNDC5 is a molecular link between exercise and increased BDNF in the brain, the scientists asked whether artificially increasing FNDC5 in the absence of exercise would have the same effect. They used a harmless virus to deliver the protein to mice through the bloodstream, in hopes the FNDC5 could reach the brain and raise BDNF production. Seven days later, they examined the mouse brains and observed a significant increase in BDNF in the hippocampus.
“Perhaps the most exciting result overall is that peripheral delivery of FNDC5 with adenoviral vectors is sufficient to induce central expression of Bdnf and other genes with potential neuroprotective functions or those involved in learning and memory,” the authors said. Spiegelman cautioned that further research is needed to determine whether giving FNDC5 actually improves cognitive function in the animals. The scientists also aren’t sure whether the protein that got into the brain is FNDC5 itself, or irisin, or perhaps another variant of the protein.
Spiegelman said that development of irisin as a drug would require creating a more stable form of the protein.
The research was supported by the JPB Foundation and National Institutes of Health grants DK31405 and DK90861.
Adapted from a Dana-Farber news release.