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Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells

Folliculostellate cell gap junctions establish a network for the transmission of information within the anterior pituitary. Connexins make up gap junction channels. Changes in connexin (Cx) turnover modify gap junction-mediated intercellular communication. We have reported that cytokines and hormone...

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Autores principales: Vitale, María Leiza, Garcia, Christopher J., Akpovi, Casimir D., Pelletier, R.-Marc
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5536325/
https://www.ncbi.nlm.nih.gov/pubmed/28759642
http://dx.doi.org/10.1371/journal.pone.0182495
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author Vitale, María Leiza
Garcia, Christopher J.
Akpovi, Casimir D.
Pelletier, R.-Marc
author_facet Vitale, María Leiza
Garcia, Christopher J.
Akpovi, Casimir D.
Pelletier, R.-Marc
author_sort Vitale, María Leiza
collection PubMed
description Folliculostellate cell gap junctions establish a network for the transmission of information within the anterior pituitary. Connexins make up gap junction channels. Changes in connexin (Cx) turnover modify gap junction-mediated intercellular communication. We have reported that cytokines and hormones influence Cx43 turnover and coupling in folliculostellate cells and in the folliculostellate cell line TtT/GF. In addition, the expression of different connexins alters intercellular communication and connexins may have functions besides cell coupling. Here we assessed the expression, turnover and subcellular localization of Cx46 and Cx50 in the anterior pituitary and TtT/GF cells. Then, we assessed the impact of various natural (lactation, annual reproductive cycle, bFGF) and pathological (autoimmune orchitis, diabetes/obesity) conditions associated with altered anterior pituitary hormone secretion on Cx46 and Cx50. Anterior pituitary Cx46 and Cx50 expression and subcellular distribution were cell-dependent. Cx46 was expressed by folliculostellate, TtT/GF and endocrine cells. In the cytoplasm, Cx46 was chiefly associated with lysosomes. Variously sized Cx46 molecules were recovered exclusively in the TtT/GF cell nuclear fraction. In the nucleus, Cx46 co-localized with Nopp-140, a nucleolar factor involved in rRNA processing. Neither cytoplasmic nor nuclear Cx46 and Cx43 co-localized. Cx50 localized to folliculostellate and TtT/GF cells, and to the walls of blood capillaries, not to endocrine cells. Cx50 was cytoplasmic and associated with the cell membrane, not nuclear. Cx50 did not co-localize with Cx46 but it co-localized in the cytoplasm and co-immunoprecipitated with Cx43. Cx46 and Cx50 responses to various physiological and pathological challenges were different, often opposite. Cx46 and Cx43 expression and phosphorylation profiles differed in the anterior pituitary, whereas Cx50 and Cx43 were similar. The data suggest that Cx46 participates to cellular growth and proliferation and that Cx50, together with Cx43, contributes to folliculostellate cell coupling.
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spelling pubmed-55363252017-08-07 Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells Vitale, María Leiza Garcia, Christopher J. Akpovi, Casimir D. Pelletier, R.-Marc PLoS One Research Article Folliculostellate cell gap junctions establish a network for the transmission of information within the anterior pituitary. Connexins make up gap junction channels. Changes in connexin (Cx) turnover modify gap junction-mediated intercellular communication. We have reported that cytokines and hormones influence Cx43 turnover and coupling in folliculostellate cells and in the folliculostellate cell line TtT/GF. In addition, the expression of different connexins alters intercellular communication and connexins may have functions besides cell coupling. Here we assessed the expression, turnover and subcellular localization of Cx46 and Cx50 in the anterior pituitary and TtT/GF cells. Then, we assessed the impact of various natural (lactation, annual reproductive cycle, bFGF) and pathological (autoimmune orchitis, diabetes/obesity) conditions associated with altered anterior pituitary hormone secretion on Cx46 and Cx50. Anterior pituitary Cx46 and Cx50 expression and subcellular distribution were cell-dependent. Cx46 was expressed by folliculostellate, TtT/GF and endocrine cells. In the cytoplasm, Cx46 was chiefly associated with lysosomes. Variously sized Cx46 molecules were recovered exclusively in the TtT/GF cell nuclear fraction. In the nucleus, Cx46 co-localized with Nopp-140, a nucleolar factor involved in rRNA processing. Neither cytoplasmic nor nuclear Cx46 and Cx43 co-localized. Cx50 localized to folliculostellate and TtT/GF cells, and to the walls of blood capillaries, not to endocrine cells. Cx50 was cytoplasmic and associated with the cell membrane, not nuclear. Cx50 did not co-localize with Cx46 but it co-localized in the cytoplasm and co-immunoprecipitated with Cx43. Cx46 and Cx50 responses to various physiological and pathological challenges were different, often opposite. Cx46 and Cx43 expression and phosphorylation profiles differed in the anterior pituitary, whereas Cx50 and Cx43 were similar. The data suggest that Cx46 participates to cellular growth and proliferation and that Cx50, together with Cx43, contributes to folliculostellate cell coupling. Public Library of Science 2017-07-31 /pmc/articles/PMC5536325/ /pubmed/28759642 http://dx.doi.org/10.1371/journal.pone.0182495 Text en © 2017 Vitale et al http://creativecommons.org/licenses/by/4.0/ This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
Vitale, María Leiza
Garcia, Christopher J.
Akpovi, Casimir D.
Pelletier, R.-Marc
Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title_full Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title_fullStr Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title_full_unstemmed Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title_short Distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
title_sort distinctive actions of connexin 46 and connexin 50 in anterior pituitary folliculostellate cells
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5536325/
https://www.ncbi.nlm.nih.gov/pubmed/28759642
http://dx.doi.org/10.1371/journal.pone.0182495
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