Rationale: The miR-143/145 cluster is highly expressed in smooth muscle cells (SMCs), where it regulates phenotypic switch and vascular homeostasis. Whether it plays a role in neighboring endothelial cells (ECs) is still unknown. Objective: To determine whether SMCs control EC functions through passage of miR-143 and miR-145. Methods and Results: We used cocultures of SMCs and ECs under different conditions, as well as intact vessels to assess The transfer of miR-143 and miR-145 from one cell type to another. Imaging of cocultured cells transduced with fluorescent miRNAs suggested that miRNA transfer involves membrane protrusions known as tunneling nanotubes. Furthermore, we show that miRNA passage is modulated by The transforming growth factor (TGF) β pathway because both a specific transforming growth factor-β (TGFβ) inhibitor (SB431542) and an shRNA against TGFβRII suppressed The passage of miR-143/145 from SMCs to ECs. Moreover, miR-143 and miR-145 modulated angiogenesis by reducing The proliferation index of ECs and their capacity to form vessel-like structures when cultured on matrigel. We also identified hexokinase II (HKII) and integrin β 8 (ITGβ8) -2 genes essential for The angiogenic potential of ECs -as targets of miR-143 and miR-145, respectively. The inhibition of these genes modulated EC phenotype, similarly to miR-143 and miR-145 overexpression in ECs. These findings were confirmed by ex vivo and in vivo approaches, in which it was shown that TGFβ and vessel stress, respectively, triggered miR-143/145 transfer from SMCs to ECs. Conclusions: Our results demonstrate that miR-143 and miR-145 act as communication molecules between SMCs and ECs to modulate The angiogenic and vessel stabilization properties of ECs.

TGFβ triggers miR-143/145 transfer from smooth muscle cells to endothelial cells, thereby modulating vessel stabilization / Climent, Montserrat; Quintavalle, Manuela; Miragoli, Michele; Chen, Ju; Condorelli, Gianluigi; Elia, Leonardo. - In: CIRCULATION RESEARCH. - ISSN 0009-7330. - 116:11(2015), pp. 1753-1764. [10.1161/CIRCRESAHA.116.305178]

TGFβ triggers miR-143/145 transfer from smooth muscle cells to endothelial cells, thereby modulating vessel stabilization

MIRAGOLI, MICHELE;
2015-01-01

Abstract

Rationale: The miR-143/145 cluster is highly expressed in smooth muscle cells (SMCs), where it regulates phenotypic switch and vascular homeostasis. Whether it plays a role in neighboring endothelial cells (ECs) is still unknown. Objective: To determine whether SMCs control EC functions through passage of miR-143 and miR-145. Methods and Results: We used cocultures of SMCs and ECs under different conditions, as well as intact vessels to assess The transfer of miR-143 and miR-145 from one cell type to another. Imaging of cocultured cells transduced with fluorescent miRNAs suggested that miRNA transfer involves membrane protrusions known as tunneling nanotubes. Furthermore, we show that miRNA passage is modulated by The transforming growth factor (TGF) β pathway because both a specific transforming growth factor-β (TGFβ) inhibitor (SB431542) and an shRNA against TGFβRII suppressed The passage of miR-143/145 from SMCs to ECs. Moreover, miR-143 and miR-145 modulated angiogenesis by reducing The proliferation index of ECs and their capacity to form vessel-like structures when cultured on matrigel. We also identified hexokinase II (HKII) and integrin β 8 (ITGβ8) -2 genes essential for The angiogenic potential of ECs -as targets of miR-143 and miR-145, respectively. The inhibition of these genes modulated EC phenotype, similarly to miR-143 and miR-145 overexpression in ECs. These findings were confirmed by ex vivo and in vivo approaches, in which it was shown that TGFβ and vessel stress, respectively, triggered miR-143/145 transfer from SMCs to ECs. Conclusions: Our results demonstrate that miR-143 and miR-145 act as communication molecules between SMCs and ECs to modulate The angiogenic and vessel stabilization properties of ECs.
2015
TGFβ triggers miR-143/145 transfer from smooth muscle cells to endothelial cells, thereby modulating vessel stabilization / Climent, Montserrat; Quintavalle, Manuela; Miragoli, Michele; Chen, Ju; Condorelli, Gianluigi; Elia, Leonardo. - In: CIRCULATION RESEARCH. - ISSN 0009-7330. - 116:11(2015), pp. 1753-1764. [10.1161/CIRCRESAHA.116.305178]
File in questo prodotto:
File Dimensione Formato  
CIRCRES2014305178D_corrected proof.pdf

accesso aperto

Tipologia: Documento in Post-print
Licenza: Creative commons
Dimensione 1.95 MB
Formato Adobe PDF
1.95 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11381/2817803
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 171
  • ???jsp.display-item.citation.isi??? 165
social impact