The ontogeny of [125I]rat-alpha-CGRP binding sites in the spinal cord of sheep: a prenatal and postnatal study.
In this study we describe the ontogeny of [125I]rat-alpha-calcitonin gene-related peptide binding sites in the spinal cord of fetal and postnatal sheep. The density and distribution of binding sites has been compared with the localization of calcitonin gene-related peptide like-immunoreactivity at corresponding stages of development [Nitsos I. and Rees S. (1993) Neuroscience 54, 239-252]. At 68 days of gestation (term = 146 days), the earliest fetal tissue examined, there was no evidence of binding sites in lamina I or the outer regions of lamina II (lamina IIo), although there was a sparse distribution of binding sites in the inner region of lamina II (lamina IIi). By comparison, binding appeared to be more marked in laminae III-V and more concentrated again in laminae VI-X. This distribution essentially remained constant until 124 days, when there appeared to be a marked increase in the density of binding sites throughout the gray matter, particularly in the dorsal horn in the lateral extent of both lamina IIo and IIi as well as in laminae III, V and VI. This increase was also observed in the intermediate zone (lamina VII) and in lamina X. Binding in the ventral horn, which was diffuse until this stage, now became particularly dense in the medial and lateral regions of the horn. From 124 days to one month postnatal, there was no marked change in the density or distribution of binding sites.(ABSTRACT TRUNCATED AT 250 WORDS)
Nitsos
I
I
Department of Physiology, Monash University, Clayton, Victoria, Australia.
Sexton
P M
PM
Rees
S
S
D000375:Aging / Q000378:metabolism*; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development / Q000378:metabolism*; D001665:Binding Sites; D015740:Calcitonin Gene-Related Peptide / Q000378:metabolism*; D005314:Embryonic and Fetal Development; D005333:Fetus / Q000378:metabolism* / Q000502:physiology; D007457:Iodine Radioisotopes; D051381:Rats; D012756:Sheep; D013116:Spinal Cord / Q000196:embryology* / Q000378:metabolism*; D014018:Tissue Distribution
D007457:Iodine Radioisotopes; D015740:Calcitonin Gene-Related Peptide