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Journal of Neuroscience, Vol 6, 2187-2199, Copyright © 1986 by Society for Neuroscience

ARTICLE

Ontogeny of substance P receptor binding sites in rat brain

R Quirion and TV Dam

The ontogeny of substance P (SP) receptor binding sites in rat brain has been studied using both membrane binding assays and in vitro receptor autoradiography. The density of SP binding sites is maximal 1 d before birth and decreases thereafter to reach adult values 14 d after birth. During the early postnatal period, the distribution of SP binding sites undergoes major modifications. For example, very high densities of SP binding sites are present in most brain stem nuclei from 1 to 14 d after birth, while it is not the case in adults. In the striatum, SP receptors are distributed in a "patchy" manner early after birth, while it is much more homogeneous in the adult. This demonstrates that SP receptors undergo major redistributions during postnatal development. The very high density of SP binding sites present in the brain at its early stages of development may indicate that SP could be an important factor involved in the early organization of the CNS.

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