Brown adipose tissue monocytes support tissue expansion.
Fiche publication
Date publication
septembre 2021
Journal
Nature communications
Auteurs
Membres identifiés du Cancéropôle Est :
Pr MASSON David
Tous les auteurs :
Gallerand A, Stunault MI, Merlin J, Luehmann HP, Sultan DH, Firulyova MM, Magnone V, Khedher N, Jalil A, Dolfi B, Castiglione A, Dumont A, Ayrault M, Vaillant N, Gilleron J, Barbry P, Dombrowicz D, Mack M, Masson D, Bertero T, Becher B, Williams JW, Zaitsev K, Liu Y, Guinamard RR, Yvan-Charvet L, Ivanov S
Lien Pubmed
Résumé
Monocytes are part of the mononuclear phagocytic system. Monocytes play a central role during inflammatory conditions and a better understanding of their dynamics might open therapeutic opportunities. In the present study, we focused on the characterization and impact of monocytes on brown adipose tissue (BAT) functions during tissue remodeling. Single-cell RNA sequencing analysis of BAT immune cells uncovered a large diversity in monocyte and macrophage populations. Fate-mapping experiments demonstrated that the BAT macrophage pool requires constant replenishment from monocytes. Using a genetic model of BAT expansion, we found that brown fat monocyte numbers were selectively increased in this scenario. This observation was confirmed using a CCR2-binding radiotracer and positron emission tomography. Importantly, in line with their tissue recruitment, blood monocyte counts were decreased while bone marrow hematopoiesis was not affected. Monocyte depletion prevented brown adipose tissue expansion and altered its architecture. Podoplanin engagement is strictly required for BAT expansion. Together, these data redefine the diversity of immune cells in the BAT and emphasize the role of monocyte recruitment for tissue remodeling.
Référence
Nat Commun. 2021 09 6;12(1):5255