Specific immunostaining for CCP II, a novel calcitonin carboxyl terminal peptide encoded by the calcitonin/CGRP gene

Alternative splicing of the primary transcript of the CALC I gene in thyroid C-cells results predominantly in calcitonin (CT) mRNA (exons 1-4), whereas CGRP mRNA (exons 1, 2, 3, 5, and 6) is mainly produced in neuronal cells. The CT mRNA encodes for a protein precursor containing an amino terminal p...

Full description

Saved in:
Bibliographic Details
Published in:The journal of histochemistry and cytochemistry 1993-11, Vol.41 (11), p.1605-1610
Main Authors: Giscard-Dartevelle, S, Ghillani, P, Taboulet, J, Troalen, F, Segond, N, Lasmoles, F
Format: Article
Language:English
Subjects:
Alternative Splicing
Antibodies, Monoclonal
Biological and medical sciences
Calcitonin - analysis
Calcitonin - genetics
Calcitonin - metabolism
Calcitonin Gene-Related Peptide - genetics
Calcitonin Gene-Related Peptide - metabolism
Carcinoma, Medullary - metabolism
Diverse techniques
Fluorescent Antibody Technique
Fundamental and applied biological sciences. Psychology
Humans
Molecular and cellular biology
Peptide Fragments - analysis
RNA, Messenger
Staining and Labeling
Thyroid Neoplasms - metabolism
Tumor Cells, Cultured
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Alternative splicing of the primary transcript of the CALC I gene in thyroid C-cells results predominantly in calcitonin (CT) mRNA (exons 1-4), whereas CGRP mRNA (exons 1, 2, 3, 5, and 6) is mainly produced in neuronal cells. The CT mRNA encodes for a protein precursor containing an amino terminal peptide, CT, and a carboxyl terminal peptide (CCP I). CGRP precursor is composed of the same amino terminal peptide and CGRP. Recently we reported the presence of a third mature transcript of the CALC I gene in human medullary thyroid carcinoma (MTC) tissues. This transcript encodes for a precursor containing the amino terminal peptide CT and a novel carboxyl terminal peptide, CCP II. This finding was further confirmed in the TT-cell line derived from a human MTC. We produced monoclonal antibodies against CCP II and developed a rapid and specific immunofluorescence method for this peptide. We demonstrated CCP II-specific immunoreactivity in TT-cells and in MTC tissues. CCP II labeling was relatively homogeneous in contrast to CT and CGRP, which presented striking heterogeneity for intensity of labeling. Therefore, CCP II mRNA is translated in tumor cells in an apparently constitutive way.
ISSN:0022-1554
1551-5044
DOI:10.1177/41.11.7691931