Many neuromuscular conditions are characterized by an exaggerated exercise-induced fatigue response. This form of inactivity is a major determinant of disability. The mechanism underlying this type of fatigue remains unknown. It is shown in mice that such exaggerated fatigue is due to a lack of contraction-induced signalling from sarcolemma-localized nNOS. In addition, in patient biopsies from a large number of distinct myopathies, sarcolemmal nNOS is reduced—pointing towards a common mechanism of fatigue.
- Yvonne M. Kobayashi
- Erik P. Rader
- Kevin P. Campbell