miR-21 antagonism reprograms macrophage metabolism and abrogates chronic allograft vasculopathy.
Am J Transplant
; 21(10): 3280-3295, 2021 10.
Article
em En
| MEDLINE
| ID: mdl-33764625
ABSTRACT
Despite much progress in improving graft outcome during cardiac transplantation, chronic allograft vasculopathy (CAV) remains an impediment to long-term graft survival. MicroRNAs (miRNAs) emerged as regulators of the immune response. Here, we aimed to examine the miRNA network involved in CAV. miRNA profiling of heart samples obtained from a murine model of CAV and from cardiac-transplanted patients with CAV demonstrated that miR-21 was most significantly expressed and was primarily localized to macrophages. Interestingly, macrophage depletion with clodronate did not significantly prolong allograft survival in mice, while conditional deletion of miR-21 in macrophages or the use of a specific miR-21 antagomir resulted in indefinite cardiac allograft survival and abrogated CAV. The immunophenotype, secretome, ability to phagocytose, migration, and antigen presentation of macrophages were unaffected by miR-21 targeting, while macrophage metabolism was reprogrammed, with a shift toward oxidative phosphorylation in naïve macrophages and with an inhibition of glycolysis in pro-inflammatory macrophages. The aforementioned effects resulted in an increase in M2-like macrophages, which could be reverted by the addition of L-arginine. RNA-seq analysis confirmed alterations in arginase-associated pathways associated with miR-21 antagonism. In conclusion, miR-21 is overexpressed in murine and human CAV, and its targeting delays CAV onset by reprogramming macrophages metabolism.
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Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Transplante de Coração
/
MicroRNAs
Limite:
Animals
/
Humans
Idioma:
En
Revista:
Am J Transplant
Assunto da revista:
TRANSPLANTE
Ano de publicação:
2021
Tipo de documento:
Article
País de afiliação:
Itália