High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.

Gap junctions are involved in vascular growth and their expression pattern is modulated in response to hemodynamic conditions. They are clusters of intercellular channels formed by connexins (Cx) of which four subtypes are expressed in the cardiovascular system, namely Cx37, Cx40, Cx43 and Cx45. We...

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Autores principales:	Volker J Schmidt, Johannes G Hilgert, Jennifer M Covi, Christian Weis, Johanna O Wietbrock, Cor de Wit, Raymund E Horch, Ulrich Kneser
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2013
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/a256d813d2594853b06dc397e9875995
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spelling	oai:doaj.org-article:a256d813d2594853b06dc397e98759952021-11-18T08:46:54ZHigh flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.1932-620310.1371/journal.pone.0078782https://doaj.org/article/a256d813d2594853b06dc397e98759952013-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/24236049/?tool=EBIhttps://doaj.org/toc/1932-6203Gap junctions are involved in vascular growth and their expression pattern is modulated in response to hemodynamic conditions. They are clusters of intercellular channels formed by connexins (Cx) of which four subtypes are expressed in the cardiovascular system, namely Cx37, Cx40, Cx43 and Cx45. We hypothesize that high flow conditions affect vascular expression of Cx in vivo. To test this hypothesis, flow hemodynamics and subsequent changes in vascular expression of Cx were studied in an angioinductive rat arteriovenous (AV) loop model. Fifteen days after interposition of a femoral vein graft between femoral artery and vein encased in a fibrin-filled chamber strong neovascularization was evident that emerged predominantly from the graft. Blood flow through the grafted vessel was enhanced ∼4.5-fold accompanied by increased pulsatility exceeding arterial levels. Whereas Cx43 protein expression in the femoral vein is negligible at physiologic flow conditions as judged by immunostaining its expression was enhanced in the endothelium of the venous graft exposed to these hemodynamic changes for 5 days. This was most likely due to enhanced transcription since Cx43 mRNA increased likewise, whereas Cx37 mRNA expression remained unaffected and Cx40 mRNA was reduced. Although enhanced Cx43 expression in regions of high flow in vivo has already been demonstrated, the arteriovenous graft used in the present study provides a reliable model to verify an association between Cx43 expression and high flow conditions in vivo that was selective for this Cx. We conclude that enhancement of blood flow and its oscillation possibly associated with the transition from laminar to more turbulent flow induces Cx43 expression in a vein serving as an AV loop. It is tempting to speculate that this upregulation is involved in the vessel formation occuring in this model as Cx43 was suggested to be involved in angiogenesis.Volker J SchmidtJohannes G HilgertJennifer M CoviChristian WeisJohanna O WietbrockCor de WitRaymund E HorchUlrich KneserPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 8, Iss 11, p e78782 (2013)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Volker J Schmidt Johannes G Hilgert Jennifer M Covi Christian Weis Johanna O Wietbrock Cor de Wit Raymund E Horch Ulrich Kneser High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
description	Gap junctions are involved in vascular growth and their expression pattern is modulated in response to hemodynamic conditions. They are clusters of intercellular channels formed by connexins (Cx) of which four subtypes are expressed in the cardiovascular system, namely Cx37, Cx40, Cx43 and Cx45. We hypothesize that high flow conditions affect vascular expression of Cx in vivo. To test this hypothesis, flow hemodynamics and subsequent changes in vascular expression of Cx were studied in an angioinductive rat arteriovenous (AV) loop model. Fifteen days after interposition of a femoral vein graft between femoral artery and vein encased in a fibrin-filled chamber strong neovascularization was evident that emerged predominantly from the graft. Blood flow through the grafted vessel was enhanced ∼4.5-fold accompanied by increased pulsatility exceeding arterial levels. Whereas Cx43 protein expression in the femoral vein is negligible at physiologic flow conditions as judged by immunostaining its expression was enhanced in the endothelium of the venous graft exposed to these hemodynamic changes for 5 days. This was most likely due to enhanced transcription since Cx43 mRNA increased likewise, whereas Cx37 mRNA expression remained unaffected and Cx40 mRNA was reduced. Although enhanced Cx43 expression in regions of high flow in vivo has already been demonstrated, the arteriovenous graft used in the present study provides a reliable model to verify an association between Cx43 expression and high flow conditions in vivo that was selective for this Cx. We conclude that enhancement of blood flow and its oscillation possibly associated with the transition from laminar to more turbulent flow induces Cx43 expression in a vein serving as an AV loop. It is tempting to speculate that this upregulation is involved in the vessel formation occuring in this model as Cx43 was suggested to be involved in angiogenesis.
format	article
author	Volker J Schmidt Johannes G Hilgert Jennifer M Covi Christian Weis Johanna O Wietbrock Cor de Wit Raymund E Horch Ulrich Kneser
author_facet	Volker J Schmidt Johannes G Hilgert Jennifer M Covi Christian Weis Johanna O Wietbrock Cor de Wit Raymund E Horch Ulrich Kneser
author_sort	Volker J Schmidt
title	High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
title_short	High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
title_full	High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
title_fullStr	High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
title_full_unstemmed	High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
title_sort	high flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.
publisher	Public Library of Science (PLoS)
publishDate	2013
url	https://doaj.org/article/a256d813d2594853b06dc397e9875995
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High flow conditions increase connexin43 expression in a rat arteriovenous and angioinductive loop model.

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