Article (Scientific journals)
Mesenchymal Stromal Cells Accelerate Epithelial Tight Junction Assembly via the AMP-Activated Protein Kinase Pathway, Independently of Liver Kinase B1
Rowart, Pascal; ERPICUM, Pauline; KRZESINSKI, Jean-Marie et al.
2017In Stem Cells International
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Abstract :
[en] Background. Mesenchymal stromal cells (MSC) are fibroblast-like multipotent cells capable of tissue-repair properties. Given the essentiality of tight junctions (TJ) in epithelial integrity, we hypothesized that MSC modulate TJ formation, via the AMP-activated kinase (AMPK) pathway. Liver kinase-β1 (LKB1) and Ca2+-calmodulin-dependent protein kinase kinase (CaMKK) represent the main kinases that activate AMPK. Methods. The in vitro Ca2+ switch from 5 μM to 1.8 mM was performed using epithelial Madin-Darby canine kidney (MDCK) cells cultured alone or cocultured with rat bone marrow-derived MSC or preexposed to MSC-conditioned medium. TJ assembly was measured by assessing ZO-1 relocation to cell-cell contacts. Experiments were conducted using MDCK stably expressing short-hairpin-RNA (shRNA) against LKB1 or luciferase (LUC, as controls). Compound STO-609 (50 μM) was used as CaMKK inhibitor. Results. Following Ca2+ switch, ZO-1 relocation and phosphorylation/activation of AMPK were significantly higher in MDCK/MSC compared to MDCK. No difference in AMPK phosphorylation was observed between LKB1-shRNA and Luc-shRNA MDCK following Ca2+ switch. Conversely, incubation with STO-609 prior to Ca2+ switch prevented AMPK phosphorylation and ZO-1 relocation. MSC-conditioned medium slightly but significantly increased AMPK activation and accelerated TJ-associated distribution of ZO-1 post Ca2+ switch in comparison to regular medium. Conclusions. MSC modulate the assembly of epithelial TJ, via the CaMKK/AMPK pathway independently of LKB1.
Disciplines :
Urology & nephrology
Author, co-author :
Rowart, Pascal ;  Université de Liège - ULiège > Département des sciences cliniques > Néphrologie
ERPICUM, Pauline ;  Centre Hospitalier Universitaire de Liège - CHU > Service de néphrologie
KRZESINSKI, Jean-Marie ;  Centre Hospitalier Universitaire de Liège - CHU > Service de néphrologie
Sebbagh, Michaël;  INSERM: Marseille, Provence-Alpes-Côte d'Azu, France
JOURET, François  ;  Centre Hospitalier Universitaire de Liège - CHU > Service de néphrologie
Language :
English
Title :
Mesenchymal Stromal Cells Accelerate Epithelial Tight Junction Assembly via the AMP-Activated Protein Kinase Pathway, Independently of Liver Kinase B1
Publication date :
11 July 2017
Journal title :
Stem Cells International
ISSN :
1687-966X
eISSN :
1687-9678
Publisher :
Hindawi Publishing Corporation
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 18 September 2017

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