title: Specific immunostaining for CCP II, a novel calcitonin carboxyl terminal peptide encoded by the calcitonin/CGRP gene.
abstract: 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.
authors.affiliation: INSERM U 349, Centre Viggo Petersen, Hôpital Lariboisière, Paris, France.
authors.forename: S
authors.initials: S
authors.lastname: Giscard-Dartevelle
authors.forename: P
authors.initials: P
authors.lastname: Ghillani
authors.forename: J
authors.initials: J
authors.lastname: Taboulet
authors.forename: F
authors.initials: F
authors.lastname: Troalen
authors.forename: N
authors.initials: N
authors.lastname: Segond
authors.forename: F
authors.initials: F
authors.lastname: Lasmoles
mesh_terms: D017398:Alternative Splicing; D000911:Antibodies, Monoclonal; D002116:Calcitonin / Q000032:analysis* / Q000235:genetics / Q000378:metabolism*; D015740:Calcitonin Gene-Related Peptide / Q000235:genetics / Q000378:metabolism*; D018276:Carcinoma, Medullary / Q000378:metabolism; D005455:Fluorescent Antibody Technique; D006801:Humans; D010446:Peptide Fragments / Q000032:analysis*; D012333:RNA, Messenger; D013194:Staining and Labeling; D013964:Thyroid Neoplasms / Q000378:metabolism; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; C083815:CCP II; D010446:Peptide Fragments; D012333:RNA, Messenger; D002116:Calcitonin; D015740:Calcitonin Gene-Related Peptide