File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Identification and functional characterization of two alternatively spliced growth hormone secretagogue receptor transcripts from the pituitary of black seabream Acanthopagrus schlegeli

TitleIdentification and functional characterization of two alternatively spliced growth hormone secretagogue receptor transcripts from the pituitary of black seabream Acanthopagrus schlegeli
Authors
KeywordsCloning and functional expression
Differential tissue distribution
Gene structure
Seabream growth hormone secretagogue receptor
Issue Date2004
Citation
Molecular and Cellular Endocrinology, 2004, v. 214, n. 1-2, p. 81-95 How to Cite?
AbstractTwo cDNA transcripts, namely sbGHSR-1a and sbGHSR-1b, for growth hormone secretagogue receptor (GHSR), were identified from the seabream pituitary. When translated, the sbGHSR-1a encodes for a protein of 385 amino acids (aa) with seven putative transmembrane domains and the sbGHSR-1b contains 295 aa with five putative transmembrane domains. Tissue distribution studies indicated that the two receptors are mainly expressed in the central nervous system of the fish. The sbGHSR-1a transcript has the highest expression level in the pituitary. The sbGHSR-1b transcript, on the other hand, has the highest expression level in the telencephalon. Genomic Southern analysis indicated that there is a single gene for GHSR in the seabream genome. Comparison of the cDNA sequences of sbGHSR1a and sbGHSR1b with the seabream genomic sequence indicated that the presence of the two receptor transcripts is a result of alternative splicing of the single GHSR gene. The two receptor cDNAs were expressed in cultured eukaryotic cells for functional analyses. A variety of structurally diverse growth hormone secretogogues (GHS), including the peptide GHS (GHRP-6 and ghrelin), the benzolactam GHS (L692,585) and the spiropiperidine GHS (L163,255), were able to trigger an elevation of intracellular Ca2+ ion concentration in HEK293 cells expressing sbGHSR-1a, but not in cells expressing sbGHSR-1b. Microphysiometry revealed that an increase in extracellular acidification rate (EAR) could be detected in CHO cells expressing the sbGHSR-1a receptor when stimulated with GHRP-6. On the contrary, CHO cells expressing the sbGHSR-1b receptor registered no detectable EAR changes. However, when sbGHSR-1b was co-expressed with sbGHSR-1a in HEK293 cells, the signal transduction capacity of sbGHSR-1a was attenuated. This is the first report on the identification of a GHSR-1b transcript from species other than mammals and the demonstration that receptor interaction might provide a possible explanation for the existence and biological significance of the sbGHSR-1b transcript. © 2003 Elsevier Ireland Ltd. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/225023
ISSN
2015 Impact Factor: 3.859
2015 SCImago Journal Rankings: 2.116

 

DC FieldValueLanguage
dc.contributor.authorChan, Chi B.-
dc.contributor.authorCheng, C. H K-
dc.date.accessioned2016-04-18T11:16:32Z-
dc.date.available2016-04-18T11:16:32Z-
dc.date.issued2004-
dc.identifier.citationMolecular and Cellular Endocrinology, 2004, v. 214, n. 1-2, p. 81-95-
dc.identifier.issn0303-7207-
dc.identifier.urihttp://hdl.handle.net/10722/225023-
dc.description.abstractTwo cDNA transcripts, namely sbGHSR-1a and sbGHSR-1b, for growth hormone secretagogue receptor (GHSR), were identified from the seabream pituitary. When translated, the sbGHSR-1a encodes for a protein of 385 amino acids (aa) with seven putative transmembrane domains and the sbGHSR-1b contains 295 aa with five putative transmembrane domains. Tissue distribution studies indicated that the two receptors are mainly expressed in the central nervous system of the fish. The sbGHSR-1a transcript has the highest expression level in the pituitary. The sbGHSR-1b transcript, on the other hand, has the highest expression level in the telencephalon. Genomic Southern analysis indicated that there is a single gene for GHSR in the seabream genome. Comparison of the cDNA sequences of sbGHSR1a and sbGHSR1b with the seabream genomic sequence indicated that the presence of the two receptor transcripts is a result of alternative splicing of the single GHSR gene. The two receptor cDNAs were expressed in cultured eukaryotic cells for functional analyses. A variety of structurally diverse growth hormone secretogogues (GHS), including the peptide GHS (GHRP-6 and ghrelin), the benzolactam GHS (L692,585) and the spiropiperidine GHS (L163,255), were able to trigger an elevation of intracellular Ca2+ ion concentration in HEK293 cells expressing sbGHSR-1a, but not in cells expressing sbGHSR-1b. Microphysiometry revealed that an increase in extracellular acidification rate (EAR) could be detected in CHO cells expressing the sbGHSR-1a receptor when stimulated with GHRP-6. On the contrary, CHO cells expressing the sbGHSR-1b receptor registered no detectable EAR changes. However, when sbGHSR-1b was co-expressed with sbGHSR-1a in HEK293 cells, the signal transduction capacity of sbGHSR-1a was attenuated. This is the first report on the identification of a GHSR-1b transcript from species other than mammals and the demonstration that receptor interaction might provide a possible explanation for the existence and biological significance of the sbGHSR-1b transcript. © 2003 Elsevier Ireland Ltd. All rights reserved.-
dc.languageeng-
dc.relation.ispartofMolecular and Cellular Endocrinology-
dc.subjectCloning and functional expression-
dc.subjectDifferential tissue distribution-
dc.subjectGene structure-
dc.subjectSeabream growth hormone secretagogue receptor-
dc.titleIdentification and functional characterization of two alternatively spliced growth hormone secretagogue receptor transcripts from the pituitary of black seabream Acanthopagrus schlegeli-
dc.typeArticle-
dc.description.natureLink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.mce.2003.11.020-
dc.identifier.pmid15062547-
dc.identifier.scopuseid_2-s2.0-1142285486-
dc.identifier.volume214-
dc.identifier.issue1-2-
dc.identifier.spage81-
dc.identifier.epage95-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats