Calcineurin inhibitors augment endothelial-to-mesenchymal transition by enhancing proliferation in association with cytokine-mediated activation.

Abstract:

:Calcineurin Inhibitors (CNIs) are routinely used for immunosuppression following solid organ transplantation. However, the prolonged use of these agents lead to organ fibrosis which limits their efficacy. CNIs induce TGFβ expression, which is reported to augment endothelial-to-mesenchymal transition (EndMT), but their role in this process is not known. In these studies, we find that the CNIs FK506 and cyclosporine (CsA) are potent to increase endothelial cell (EC) proliferation using established in vitro assays (P < 0.05). Furthermore, using phosphokinase arrays, we find that each CNI activates the MAPK and Akt/mTOR signaling pathways, and that pharmacological inhibition of each pathway targets CNI-induced proliferative responses (P < 0.001). EndMT was evaluated by FACS for N-cadherin and CD31 expression and by qPCR for the expression of α-smooth muscle actin, N-cadherin and Snail. We find that CNIs do not directly induce dedifferentiation, while TGFβ and hypoxia induce EndMT in small numbers of EC. In contrast, the treatment of EC with the inflammatory cytokine TNFα was potent to elicit an EndMT response, and its effects were most notably in EC following proliferation/doubling. Taken together, these observations suggest that CNIs elicit proliferative responses, which enhance EndMT in association with local inflammation. The clinical implications of these findings are that anti-proliferative therapeutics have high potential to target the initiation of this EndMT response.

authors

Woda CB,Bruneau S,Mak AL,Haskova Z,Liu K,Ghosh CC,Briscoe DM

doi

10.1016/j.bbrc.2019.09.043

subject

Has Abstract

pub_date

2019-11-19 00:00:00

pages

667-673

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(19)31764-4

journal_volume

519

pub_type

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