title: Adipose tissue as a dedicated reservoir of functional mast cell progenitors.
abstract: White adipose tissue (WAT) is a heterogeneous tissue, found in various locations throughout the body, containing mature adipocytes and the stroma-vascular fraction (SVF). The SVF includes a large proportion of immune hematopoietic cells, among which, mast cells that contribute to diet-induced obesity. In this study, we asked whether mast cells present in mice adipose tissue could derive from hematopoietic stem/progenitor cells (HSPC) identified in the tissue. We therefore performed both in vitro and in vivo experiments dedicated to monitoring the progeny of WAT-derived HSPC. The entire study was conducted in parallel with bone marrow-derived cells, considered the gold standard for hematopoietic-lineage studies. Here, we demonstrate that adipose-derived HSPC contain a precursor-cell population committed to the mast cell lineage, and able to efficiently home to peripheral organs such as intestine and skin, where it acquires properties of functional tissue mast cells. Additionally, WAT contains a significant mast cell progenitor population, suggesting that the entire mast cell lineage process take place in WAT. Considering the quantitative importance of WAT in the adult organism and the increasing roles recently assigned to mast cells in physiopathology, WAT may represent an important source of mast cells in physiological and pathological situations.
authors.affiliation: CNRS, UMR 5241 Métabolisme, Plasticité et Mitochondrie, Université de Toulouse III Paul Sabatier, Toulouse, France.
authors.forename: Sandrine
authors.initials: S
authors.lastname: Poglio
authors.forename: Fabienne
authors.initials: F
authors.lastname: De Toni-Costes
authors.forename: Emmanuelle
authors.initials: E
authors.lastname: Arnaud
authors.forename: Patrick
authors.initials: P
authors.lastname: Laharrague
authors.forename: Eric
authors.initials: E
authors.lastname: Espinosa
authors.forename: Louis
authors.initials: L
authors.lastname: Casteilla
authors.forename: Béatrice
authors.initials: B
authors.lastname: Cousin
mesh_terms: D000273:Adipose Tissue / Q000166:cytology*; D052436:Adipose Tissue, White / Q000166:cytology; D000818:Animals; D002454:Cell Differentiation / Q000502:physiology; D019070:Cell Lineage; D002478:Cells, Cultured; D005260:Female; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D008297:Male; D008407:Mast Cells / Q000166:cytology*; D051379:Mice; D008810:Mice, Inbred C57BL; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013234:Stem Cells / Q000166:cytology*