Role of HIF-1 in proton-mediated CXCR4 down-regulation in endothelial cells

Roberta Melchionna, Marta Romani, Valeria Ambrosino, Daniela D'Arcangelo, Chiara Cencioni, Daniele Porcelli, Gabriele Toietta, Silvia Truffa, Carlo Gaetano, Antonella Mangoni, Ombretta Pozzoli, Claudia Cappuzzello, Maurizio C. Capogrossi, Monica Napolitano

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

AimsAcidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities.Methods and resultsExposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1-dependent as demonstrated by both HIF-1 and HIF-1 dominant negative overexpression, by HIF-1 silencing, and by targeted mutation of the-29 to-25 hypoxia response element (HRE) in the-357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1 binding to the CXCR4 promoter that was enhanced by acidification.ConclusionThe results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH.

Original languageEnglish
Pages (from-to)293-301
Number of pages9
JournalCardiovascular Research
Volume86
Issue number2
DOIs
Publication statusPublished - May 2010

Fingerprint

Hypoxia-Inducible Factor 1
Protons
Down-Regulation
Endothelial Cells
Response Elements
Acidosis
Chemokine CXCL12
Chemokine Receptors
Chromatin Immunoprecipitation
Chemotaxis
Apoptosis
Messenger RNA
Mutation
Hypoxia
Proteins

Keywords

  • Acidosis
  • Chemokine
  • HIF-1

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)
  • Physiology

Cite this

Role of HIF-1 in proton-mediated CXCR4 down-regulation in endothelial cells. / Melchionna, Roberta; Romani, Marta; Ambrosino, Valeria; D'Arcangelo, Daniela; Cencioni, Chiara; Porcelli, Daniele; Toietta, Gabriele; Truffa, Silvia; Gaetano, Carlo; Mangoni, Antonella; Pozzoli, Ombretta; Cappuzzello, Claudia; Capogrossi, Maurizio C.; Napolitano, Monica.

In: Cardiovascular Research, Vol. 86, No. 2, 05.2010, p. 293-301.

Research output: Contribution to journalArticle

Melchionna, R, Romani, M, Ambrosino, V, D'Arcangelo, D, Cencioni, C, Porcelli, D, Toietta, G, Truffa, S, Gaetano, C, Mangoni, A, Pozzoli, O, Cappuzzello, C, Capogrossi, MC & Napolitano, M 2010, 'Role of HIF-1 in proton-mediated CXCR4 down-regulation in endothelial cells', Cardiovascular Research, vol. 86, no. 2, pp. 293-301. https://doi.org/10.1093/cvr/cvp393
Melchionna, Roberta ; Romani, Marta ; Ambrosino, Valeria ; D'Arcangelo, Daniela ; Cencioni, Chiara ; Porcelli, Daniele ; Toietta, Gabriele ; Truffa, Silvia ; Gaetano, Carlo ; Mangoni, Antonella ; Pozzoli, Ombretta ; Cappuzzello, Claudia ; Capogrossi, Maurizio C. ; Napolitano, Monica. / Role of HIF-1 in proton-mediated CXCR4 down-regulation in endothelial cells. In: Cardiovascular Research. 2010 ; Vol. 86, No. 2. pp. 293-301.
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abstract = "AimsAcidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities.Methods and resultsExposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1-dependent as demonstrated by both HIF-1 and HIF-1 dominant negative overexpression, by HIF-1 silencing, and by targeted mutation of the-29 to-25 hypoxia response element (HRE) in the-357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1 binding to the CXCR4 promoter that was enhanced by acidification.ConclusionThe results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH.",
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AU - Cencioni, Chiara

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AU - Toietta, Gabriele

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AB - AimsAcidification is associated with a variety of pathological and physiological conditions. In the present study, we aimed at investigating whether acidic pH may regulate endothelial cell (EC) functions via the chemokine receptor CXCR4, a key modulator of EC biological activities.Methods and resultsExposure of ECs to acidic pH reversibly inhibited mRNA and protein CXCR4 expression, CXCL12/stromal cell-derived factor (SDF)-1-driven EC chemotaxis in vitro, and CXCR4 expression and activation in vivo in a mouse model. Further, CXCR4 signalling impaired acidosis-induced rescue from apoptosis in ECs. The inhibition of CXCR4 expression occurred transcriptionally and was hypoxia-inducible factor (HIF)-1-dependent as demonstrated by both HIF-1 and HIF-1 dominant negative overexpression, by HIF-1 silencing, and by targeted mutation of the-29 to-25 hypoxia response element (HRE) in the-357/-59 CXCR4 promoter fragment. Moreover, chromatin immunoprecipitation (ChIP) analysis showed endogenous HIF-1 binding to the CXCR4 promoter that was enhanced by acidification.ConclusionThe results of the present study identify CXCR4 as a key player in the EC response to acidic pH and show, for the first time, that HRE may function not only as an effector of hypoxia, but also as an acidosis response element, and raise the possibility that this may constitute a more general mechanism of transcriptional regulation at acidic pH.

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