Open AccessCalcitonin gene-related peptide and its binding sites in the human central nervous system and pituitary.
Author(s) -
Fritz A. Tschopp,
H. Henke,
Joseph B. Petermann,
Paul H. Tobler,
Robert C. Janzer,
Tomas Hökfelt,
Jan M. Lundberg,
Claudio Cuello,
Jan A. Fischer
Publication year - 1985
Publication title -
proceedings of the national academy of sciences of the united states of america
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.011
H-Index - 771
eISSN - 1091-6490
pISSN - 0027-8424
DOI - 10.1073/pnas.82.1.248
Subject(s) - calcitonin gene related peptide , medicine , spinal cord , endocrinology , posterior pituitary , globus pallidus , central nervous system , chemistry , inferior colliculus , biology , pituitary gland , anatomy , neuropeptide , nucleus , neuroscience , basal ganglia , receptor , hormone
Binding sites for synthetic human 125I-labeled calcitonin gene-related peptide (125I-CGRP) have been demonstrated in membranes of the human nervous system. Binding was high in the cerebellar cortex (1.35 +/- 0.27 fmol/mg of tissue; mean +/- SEM), spinal cord (1.06 +/- 0.27 to 1.27 +/- 0.23 fmol/mg), and nucleus dentatus (1.02 +/- 0.15 fmol/mg), intermediate in the inferior colliculus (0.80 +/- 0.14 fmol/mg) and substantia nigra (0.75 +/- 0.14 fmol/mg), low in the neocortex, globus pallidus, nucleus caudatus, hippocampus, amygdala, superior colliculus, thalamus, and hypothalamus (0.15-0.32 fmol/mg), and negligible in spinal and sympathetic ganglia and pituitary (less than 0.04 fmol/mg). Autoradiography showed distinct 125I-CGRP binding over the molecular and Purkinje cell layers of the cerebellar cortex and over the substantia gelatinosa posterior of the spinal cord. The highest levels of CGRP-like components were recognized in the dorsal part of the spinal cord and the pituitary gland. In the ventral part of the spinal cord as well as in the pituitary and thyroid glands, CGRP values were higher when measured by radioreceptorassay as compared to RIA, indicating that at least two CGRP-like components are present. The predominant CGRP-like peak on HPLC had the retention time of synthetic human CGRP. Immunohistochemistry revealed the presence of a dense plexus of CGRP immunoreactive nerve fibers in the dorsal horn of the spinal cord.