Specific immunostaining for CCP II, a novel calcitonin carboxyl terminal peptide encoded by the calcitonin/CGRP gene
| Autor: | N Segond, F Lasmoles, Ségolène Giscard-Dartevelle, J. Taboulet, P Ghillani, F Troalen |
|---|---|
| Rok vydání: | 1993 |
| Předmět: |
Calcitonin
chemistry.chemical_classification Messenger RNA Histology Staining and Labeling Calcitonin Gene-Related Peptide Alternative splicing Antibodies Monoclonal Fluorescent Antibody Technique Peptide Calcitonin gene-related peptide Primary transcript Molecular biology Peptide Fragments Alternative Splicing Exon chemistry Carcinoma Medullary RNA splicing Tumor Cells Cultured Humans RNA Messenger Thyroid Neoplasms Anatomy |
| Zdroj: | Journal of Histochemistry & Cytochemistry. 41:1605-1610 |
| ISSN: | 1551-5044 0022-1554 |
| DOI: | 10.1177/41.11.7691931 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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