Abstract
The antifibrotic properties of spiperone and its effect on stem and progenitor cells were studied on the model of reversible bleomycin-induced pulmonary fibrosis in C57Bl/6 mice. Spiperone reduced infiltration of the alveolar interstitium and alveolar ducts with inflammatory cells and prevented the growth of the connective tissue in the parenchyma of bleomycin lungs. Apart from anti-inflammatory effect, spiperone suppressed bone marrow hemopoietic cells (CD3, CD45R (B220), Ly6C, Ly6G (Gr1), CD11b (Mac1), TER-119)-, Sca-1+, c-Kit+, CD34- and progenitor hemopoietic cells (granulocyte-erythroid-macrophage-megakaryocytic and granulocyte CFU). Spiperone-induced disturbances of fi brogenesis were paralleled by restoration of endothelial cells in the lung parenchyma, reduction of the number of circulating bone marrow cells and lung mesenchymopoietic cells (mesenchymal multipotent stromal cells (CD31-, CD34-, CD45-, CD44+, CD73+, CD90+, CD106+) and progenitor fi broblast cells), and suppression of multilineage differentiation of multipotent mesenchymal stromal cells (including fi broblast-lineage cells).
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