Development, Vol 121, Issue 5 1341-1350, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

Muscle sensory neurons require neurotrophin-3 from peripheral tissues during the period of normal cell death

RA Oakley, AS Garner, TH Large and E Frank
Department of Neurobiology, University of Pittsburgh, School of Medicine, PA 15261, USA.

To determine if muscle sensory neurons require neurotrophin-3 (NT3) during the period of normal cell death, we used an NT3-specific antiserum to deplete NT3 from peripheral tissues during this period in chick embryos. DiI staining of dorsal roots indicated that limb injections of anti-NT3 reduced the spinal projection of muscle spindle afferents. In contrast, injection of the antiserum into the spinal cord had no demonstrable effect, indicating that the reduced projection following limb injection was due to peripheral blockade of NT3 signaling. Counts of neurons retrogradely labeled from muscle and cutaneous nerves showed that peripheral blockade of NT3 selectively reduced the survival of muscle sensory neurons without affecting the survival of cutaneous sensory neurons or motoneurons. In situ hybridization with trkC probes indicated that, during the period of cell death, most large diameter muscle sensory neurons express trkC transcripts, whereas few cutaneous neurons express this receptor for NT3. We conclude that large diameter muscle afferents, including spindle afferents, require NT3 from peripheral tissues to survive the normal period of sensory neuron death in vivo.

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