A novel population of mesenchymal progenitors with hematopoietic potential originated from CD14- peripheral blood mononuclear cells

Abstract

Hemopoietic system derived progenitor cells with mesenchymal features have been identified including CD14+ monocyte-derived progenitors. However, it is unclear whether there are mesenchyme derived progenitors with hematopoietic potential. Herein, we identified a novel CD14- cell-derived population with both mesenchymal and hematopoietic features in rat peripheral blood, and this cell population is different from the CD14+ monocyte-derived progenitors but designated peripheral blood multipotential mesenchymal progenitors (PBMMPs). Phenotype analysis demonstrate d expressi on of mesenchy mal markers i n PB MMPs including BMPRs, Endoglin/CD105, Fibronectin (Fn), Vimentin (Vim), Collagen (Col) I/II/III along with hematopoietic marker CD34. CD14+ cell-derived population shared the same characteristics with CFs. In mixed culture of CD14+ and CD14- cells, PBMMPs were a predominant component and expressed CD29high, CD73high, CD34high, CD45low and CD90. Except for the value of mixed T lymphocytes and CD14+ cell-derived population, hematopoietic characters of cultured PBMMPs were indicated by CD14-/CD34+/CD45-/CD90+. The mesenchymal origin was further confirmed by comparing PBMMPs with bone marrow stromal cells. Finally, we transplanted PBMMPs into a skin wound model, and results showed the specific potential of PBMMPs in not only extracellular matrix secretion but epidermal regeneration. This study provides evidence that peripheral blood contains common hematopoietic- mesenchymal progenitors from both hematopoietic and mesenchymal lineages, and CD34+ mesenchymal progenitors are a possible alternative source of epidermal cells in wound healing. © Ivyspring International Publisher. All rights reserved.