[I-125]-ET-1 binding to human peripheral nerve was studied using a com
bination of in vitro autoradiography and immunohistochemistry. Dense b
inding was predominantly to ETA receptors located on smooth muscles ce
lls of the neural microvessels and the perineurium, These results iden
tify regions where locally-released ET-1 may affect neural vascular pe
rfusion and play a pathophysiological role in certain conditions, such
as diabetic neuropathy.