PT  - JOURNAL ARTICLE
AU  - P De Camilli
AU  - M Vitadello
AU  - MP Canevini
AU  - R Zanoni
AU  - R Jahn
AU  - A Gorio
TI  - The synaptic vesicle proteins synapsin I and synaptophysin (protein P38) are concentrated both in efferent and afferent nerve endings of the skeletal muscle
AID  - 10.1523/JNEUROSCI.08-05-01625.1988
DP  - 1988 May 01
TA  - The Journal of Neuroscience
PG  - 1625--1631
VI  - 8
IP  - 5
4099  - http://www.jneurosci.org/content/8/5/1625.short
4100  - http://www.jneurosci.org/content/8/5/1625.full
SO  - J. Neurosci.1988 May 01; 8
AB  - Synapsin I and synaptophysin (protein p38) are 2 major protein components of the membranes of small synaptic vesicles of virtually all presynaptic nerve endings. Synapsin I, a phosphoprotein regulated by both Ca2+ and cAMP, is a peripheral protein of the cytoplasmic surface of the vesicle membrane. It is thought to anchor the vesicle surface to the cytoskeleton of the terminal and to play a regulatory role in neurotransmitter release. Synaptophysin is an intrinsic transmembrane glycoprotein. We report here that both proteins are present and concentrated also in afferent nerve endings, which provide the sensory innervation of the skeletal muscle and of the tendon. The distribution of both antigens in sensory nerve endings is consistent with their localization on the microvesicles that have been described in such endings. Thus, our results suggest the existence of important biochemical, and possibly functional, similarities between small synaptic vesicles of presynaptic nerve endings and microvesicles of sensory endings. Such findings provide new clues to the understanding of the physiology of sensory endings.