Document Detail

Identification and tissue distribution of mRNAs encoding salmon-type calcitonins-IV and -V in the rainbow trout.
MedLine Citation:
PMID:  15171725     Owner:  NLM     Status:  MEDLINE    
Four types of calcitonin are produced in salmonid fish, although their functional diversity is almost unknown. To explore the significance of these isoforms, we have characterized salmon-type calcitonin (sCT) mRNAs in the rainbow trout (Oncorhynchus mykiss), and examined their tissue distribution. In addition to the previously isolated sCT-I cDNAs, two new forms of sCT cDNA were cloned from the ultimobranchial gland, and one of them (sCT-IV cDNA) was predicted to encode an N-terminal peptide of 80 amino acid residues, a putative cleavage site Lys-Arg, sCT-IV, a cleavage and amidation sequence Gly-Lys-Lys-Arg, and a C-terminal peptide of 18 amino acids. The sCT-IV precursor was 78% identical with the rainbow trout sCT-I precursors. The other cloned cDNA encoded a precursor for a novel CT, sCT-V. The sCT-V peptide was different from sCT-IV by only one amino acid residue: Val at position 8 in the latter was replaced by Met. The sCT-V precursor had 80 and 90% identity with the sCT-I and -IV precursors respectively. No cDNA clones were obtained for sCTs-II or -III.Tissue distribution of sCT-I, -IV and -V mRNAs was examined by RT-PCR and specific cleavage with restriction enzymes. An amplified fragment from sCT-I mRNA was detected not only in the ultimobranchial gland, but also in the gills, testis and ovary. RT-PCR analysis coupled to restriction digestion further revealed that sCT-IV mRNA was expressed in both the testis and the ultimobranchial gland. The expression sites of sCT-IV mRNA were localized to the Leydig cells of the testis and to the parenchymal cells of the ultimobranchial gland, by in situ hybridization histochemistry. Although the amino acid sequence of sCT-V peptide was nearly the same as that of sCT-IV, the sCT-V gene showed a much wider pattern of expression: the band amplified by RT-PCR was detected in all the tissues examined except the kidney, gills and blood cells. The sCT-V mRNA was shown to be localized in the parenchymal cells of the ultimobranchial gland, but not in other tissues at the cellular level, suggesting very low expression of sCT-V mRNA in those tissues. Our results show different patterns of tissue expression of three types of sCT genes in the rainbow trout, suggesting that sCTs-I, -IV and -V might differ in their local actions.
Yoshie Hidaka; Masakazu Suzuki
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Journal of molecular endocrinology     Volume:  32     ISSN:  0952-5041     ISO Abbreviation:  J. Mol. Endocrinol.     Publication Date:  2004 Jun 
Date Detail:
Created Date:  2004-06-02     Completed Date:  2005-05-24     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8902617     Medline TA:  J Mol Endocrinol     Country:  England    
Other Details:
Languages:  eng     Pagination:  963-74     Citation Subset:  IM    
Department of Biology, Faculty of Science, Shizuoka University, Ohya 836, Shizuoka City, Shizuoka 422-8529, Japan.
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MeSH Terms
Amino Acid Sequence
Base Sequence
Calcitonin / classification,  genetics*,  metabolism
Cloning, Molecular
In Situ Hybridization
Molecular Sequence Data
Oncorhynchus mykiss / genetics,  metabolism*
Protein Isoforms / classification,  genetics*,  metabolism
RNA, Messenger / metabolism*
Salmon / genetics,  metabolism*
Sequence Alignment
Sequence Homology, Amino Acid
Tissue Distribution
Reg. No./Substance:
0/Protein Isoforms; 0/RNA, Messenger; 9007-12-9/Calcitonin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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