Naveiras, O. et al. Bone-marrow adipocytes as negative regulators of the haematopoietic microenvironment. Nature 460, 259-263

Division of Pediatric Hematology/Oncology, Children's Hospital Boston and Dana Farber Cancer Institute, Massachusetts 02115, USA.
Nature (Impact Factor: 41.46). 07/2009; 460(7252):259-63. DOI: 10.1038/nature08099
Source: PubMed


Osteoblasts and endothelium constitute functional niches that support haematopoietic stem cells in mammalian bone marrow. Adult bone marrow also contains adipocytes, the number of which correlates inversely with the haematopoietic activity of the marrow. Fatty infiltration of haematopoietic red marrow follows irradiation or chemotherapy and is a diagnostic feature in biopsies from patients with marrow aplasia. To explore whether adipocytes influence haematopoiesis or simply fill marrow space, we compared the haematopoietic activity of distinct regions of the mouse skeleton that differ in adiposity. Here we show, by flow cytometry, colony-forming activity and competitive repopulation assay, that haematopoietic stem cells and short-term progenitors are reduced in frequency in the adipocyte-rich vertebrae of the mouse tail relative to the adipocyte-free vertebrae of the thorax. In lipoatrophic A-ZIP/F1 'fatless' mice, which are genetically incapable of forming adipocytes, and in mice treated with the peroxisome proliferator-activated receptor-gamma inhibitor bisphenol A diglycidyl ether, which inhibits adipogenesis, marrow engraftment after irradiation is accelerated relative to wild-type or untreated mice. These data implicate adipocytes as predominantly negative regulators of the bone-marrow microenvironment, and indicate that antagonizing marrow adipogenesis may enhance haematopoietic recovery in clinical bone-marrow transplantation.

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Available from: Pamela L Wenzel, Mar 24, 2014
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    • "MMPs and stem cell mobilization 5 osteoblast function and the circadian oscillation of HSC retention factors [16] [17]. While the aforementioned cell types mainly support the maintenance of the HSCs, adipocytes within the bone marrow have been identified as negative regulators of hematopoiesis [18]. "
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    ABSTRACT: Hematopoietic stem cells (HSCs) have the capability to migrate back and forth between their preferred microenvironment in bone marrow niches and the peripheral blood, but under steady-state conditions only a marginal number of stem cells can be found in the circulation. Different mobilizing agents, however, which create a highly proteolytic milieu in the bone marrow, can drastically increase the number of circulating HSCs. Among other proteases secreted and membrane-bound matrix metalloproteinases (MMPs) are known to be involved in the induced mobilization process and can digest niche-specific extracellular matrix components and cytokines responsible for stem cell retention to the niches. Iatrogenic stem cell mobilization and stem cell homing to their niches are clinically employed on a routine basis, although the exact mechanisms of both processes are still not fully understood. In this review we provide an overview on the various roles of MMPs in the induced release of HSCs from the bone marrow. Copyright © 2015. Published by Elsevier B.V.
    Full-text · Article · Jan 2015 · Matrix biology: journal of the International Society for Matrix Biology
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    • "Marrow adipocytes have long been viewed as space filler cells but some recent studies have shown that BM adipocytes are negative regulators of hematopoiesis and have a reciprocal relationship with osteoblasts that promote hematopoiesis [11, 14]. Moreover, it has also been reported that BM adipocytes produce neuropilin-1, adiponectin, and TNF-α and each of which has a suppressive effect on hematopoiesis [15]. "
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    ABSTRACT: Fatty bone marrow (BM) and defective hematopoiesis are a pathologic hallmark of aplastic anemia (AA). We have investigated adipogenic and osteogenic potential of BM mesenchymal stem cells (BM-MSC) in 10 AA patients (08 males and 02 females) with median age of 37 years (range: 06 to 79 years) and in the same number of age and sex matched controls. It was observed that BM-MSC of AA patients had a morphology, phenotype, and osteogenic differentiation potential similar to control subjects but adipocytes differentiated from AA BM-MSC had a higher density and larger size of lipid droplets and they expressed significantly higher levels of adiponectin and FABP4 genes and proteins as compared to control BM-MSC ( P < 0.01 for both). Thus our data shows that AA BM-MSC have enhanced adipogenicity, which may have an important implication in the pathogenesis of the disease.
    Full-text · Article · Apr 2014 · Stem cell International
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    • "content in vivo [26]. On the contrary, BM adipocytes have negative effect on HSC pool size and function [29]. Most recently, it was demonstrated that nestin-expression MSCs (NES + MSCs) are tightly related to the maintenance of HSCs and can breed osteoblasts in the BM HSC niche [30]. "
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    ABSTRACT: Though discovered later than osteoblastic niche, vascular niche has been regarded as an alternative indispensable niche operating regulation on hematopoietic stem cells (HSCs). As significant progresses gained on this type niche, it is gradually clear that the main work of vascular niche is undertaking to support hematopoiesis. However, compared to what have been defined in the mechanisms through which the osteoblastic niche regulates hematopoiesis, we know less in vascular niche. In this review, based on research data hitherto we will focus on component foundation and various functions of vascular niche that guarantee the normal hematopoiesis process within bone marrow microenvironments. And the possible pathways raised by various research results through which this environment undergoes its function will be discussed as well.
    Full-text · Article · Apr 2014
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