P. Rasmussen and P. Brassard contributed equally to the manuscript.
Evidence for a release of brain-derived neurotrophic factor from the brain during exercise
Article first published online: 8 SEP 2009
© 2009 The Authors. Journal compilation © 2009 The Physiological Society
Volume 94, Issue 10, pages 1062–1069, October 2009
How to Cite
Rasmussen, P., Brassard, P., Adser, H., Pedersen, M. V., Leick, L., Hart, E., Secher, N. H., Pedersen, B. K. and Pilegaard, H. (2009), Evidence for a release of brain-derived neurotrophic factor from the brain during exercise. Experimental Physiology, 94: 1062–1069. doi: 10.1113/expphysiol.2009.048512
- Issue published online: 15 SEP 2009
- Article first published online: 8 SEP 2009
- (Received 28 April 2009; accepted after revision 3 August 2009; first published online 7 August 2009)
Brain-derived neurotrophic factor (BDNF) has an important role in regulating maintenance, growth and survival of neurons. However, the main source of circulating BDNF in response to exercise is unknown. To identify whether the brain is a source of BDNF during exercise, eight volunteers rowed for 4 h while simultaneous blood samples were obtained from the radial artery and the internal jugular vein. To further identify putative cerebral region(s) responsible for BDNF release, mouse brains were dissected and analysed for BDNF mRNA expression following treadmill exercise. In humans, a BDNF release from the brain was observed at rest (P < 0.05), and increased two- to threefold during exercise (P < 0.05). Both at rest and during exercise, the brain contributed 70–80% of circulating BDNF, while that contribution decreased following 1 h of recovery. In mice, exercise induced a three- to fivefold increase in BDNF mRNA expression in the hippocampus and cortex, peaking 2 h after the termination of exercise. These results suggest that the brain is a major but not the sole contributor to circulating BDNF. Moreover, the importance of the cortex and hippocampus as a source for plasma BDNF becomes even more prominent in response to exercise.