TY - JOUR

T1 - Blood vessels and desmin control the positioning of nuclei in skeletal muscle fibers

AU - Ralston, E

AU - Lu, Z

AU - Biscocho, N

AU - Soumaka, E

AU - Mavroidis, M

AU - Prats, C

AU - Lømo, T

AU - Capetanaki, Y

AU - Ploug, T

N1 - Keywords: Animals; Blood Vessels; Cell Nucleus; Desmin; Immunohistochemistry; Intermediate Filaments; Mice; Mice, Knockout; Muscle Denervation; Muscle Fibers, Skeletal; Muscle, Skeletal; Neuromuscular Junction; Rats

PY - 2006

Y1 - 2006

N2 - Skeletal muscle fibers contain hundreds to thousands of nuclei which lie immediately under the plasmalemma and are spaced out along the fiber, except for a small cluster of specialized nuclei at the neuromuscular junction. How the nuclei attain their positions along the fiber is not understood. Here we show that the nuclei are preferentially localized near blood vessels (BV), particularly in slow-twitch, oxidative fibers. Thus, in rat soleus muscle fibers, 81% of the nuclei appear next to BV. Lack of desmin markedly perturbs the distribution of nuclei along the fibers but does not prevent their close association with BV. Consistent with a role for desmin in the spacing of nuclei, we show that denervation affects the organization of desmin filaments as well as the distribution of nuclei. During chronic stimulation of denervated muscles, new BV form, along which muscle nuclei align themselves. We conclude that the positioning of nuclei along muscle fibers is plastic and that BV and desmin intermediate filaments each play a distinct role in the control of this positioning.

AB - Skeletal muscle fibers contain hundreds to thousands of nuclei which lie immediately under the plasmalemma and are spaced out along the fiber, except for a small cluster of specialized nuclei at the neuromuscular junction. How the nuclei attain their positions along the fiber is not understood. Here we show that the nuclei are preferentially localized near blood vessels (BV), particularly in slow-twitch, oxidative fibers. Thus, in rat soleus muscle fibers, 81% of the nuclei appear next to BV. Lack of desmin markedly perturbs the distribution of nuclei along the fibers but does not prevent their close association with BV. Consistent with a role for desmin in the spacing of nuclei, we show that denervation affects the organization of desmin filaments as well as the distribution of nuclei. During chronic stimulation of denervated muscles, new BV form, along which muscle nuclei align themselves. We conclude that the positioning of nuclei along muscle fibers is plastic and that BV and desmin intermediate filaments each play a distinct role in the control of this positioning.

U2 - 10.1002/jcp.20780

DO - 10.1002/jcp.20780

M3 - Journal article

C2 - 16972267

VL - 209

SP - 874

EP - 882

JO - Journal of Cellular Physiology

JF - Journal of Cellular Physiology

SN - 0021-9541

IS - 3

ER -