This proposal will systematically address a fundamental and clinically relevant question: What is the function of bone marrow adipose tissue (MAT)? Adipocytes were identified in the marrow more than a century ago, but questions about their relevance to energy homeostasis have only recently surfaced. These questions coincide with emerging data indicating that adipose depots at different sites have distinct physiologic functions and play critical roles in the pathophysiology of both metabolic and skeletal disorders. In the current project we are focused on the structure and function of bone marrow adipocytes, a unique and understudied depot that we hypothesize is associated with growth, nutritional status, and skeletal remodeling. With pilot support from R24 NIDDK 84970, we developed an integrated and multidisciplinary research team, explored new animal and human models, applied new techniques in metabolomics, developed a virtual laboratory for investigator integration, and used innovative imaging techniques for both MAT and bone micro- architecture. We also demonstrated that: 1) marrow adipocytes have unique cell surface markers that distinguish them from adipocytes in other depots;2) MAT is dynamic, with the capacity to expand or contract in response to developmental and nutritional cues such as calorie restriction; 3) adiponectin expression and basal lipolytic rates are higher in marrow adipocytes than in adipocytes from other depots;4) MAT is closely linked to bone remodeling and bone mass in humans. Most importantly, in a translational model of chronic calorie restriction, anorexia nervosa (AN), we showed that MAT was markedly increased compared to young age-matched controls and was inversely related to bone mass and the size of other fat depots. Therefore, we propose specific aims which will test the central hypothesis that MAT is an important modulator of skeletal remodeling and is fully integrated in energy homeostasis. The three aims are:1) Determine the function of MAT relative to bone remodeling;2) Assess the metabolic status of MAT and contrast this with other adipose depots;3) Define the adipocyte progenitor(AP) and its differentiation in bone marrow, and identify the genetic, molecular, biochemical and hormonal profile of MAT.
Excess MAT is associated with greater fracture risk and low bone mass. Understanding the function of marrow adipocytes and their relationship to skeletal remodeling will help identify patients at risk for fractures in disorders like anorexia nervosa, diabetes mellitus, multiple myeloma and age-related osteoporosis. Data generated from this project also holds promise for new therapeutic approaches to preserve bone mass.
| Ge, Chunxi; Zhao, Guisheng; Li, BinBin et al. (2018) Genetic inhibition of PPAR? S112 phosphorylation reduces bone formation and stimulates marrow adipogenesis. Bone 107:1-9 |
| Carvalho, Adriana Lelis; DeMambro, Victoria E; Guntur, Anyonya R et al. (2018) High fat diet attenuates hyperglycemia, body composition changes, and bone loss in male streptozotocin-induced type 1 diabetic mice. J Cell Physiol 233:1585-1600 |
| Farrell, Mariah L; Reagan, Michaela R (2018) Soluble and Cell-Cell-Mediated Drivers of Proteasome Inhibitor Resistance in Multiple Myeloma. Front Endocrinol (Lausanne) 9:218 |
| Vajapeyam, Sridhar; Ecklund, Kirsten; Mulkern, Robert V et al. (2018) Magnetic resonance imaging and spectroscopy evidence of efficacy for adrenal and gonadal hormone replacement therapy in anorexia nervosa. Bone 110:335-342 |
| Li, Ziru; Hardij, Julie; Bagchi, Devika P et al. (2018) Development, regulation, metabolism and function of bone marrow adipose tissues. Bone 110:134-140 |
| Zaidi, Mone; Lizneva, Daria; Kim, Se-Min et al. (2018) FSH, Bone Mass, Body Fat, and Biological Aging. Endocrinology 159:3503-3514 |
| Zaidi, Mone; Yuen, Tony; Sun, Li et al. (2018) Regulation of Skeletal Homeostasis. Endocr Rev 39:701-718 |
| Veldhuis-Vlug, A G; Rosen, C J (2018) Clinical implications of bone marrow adiposity. J Intern Med 283:121-139 |
| Fairfield, Heather; Falank, Carolyne; Harris, Elizabeth et al. (2018) The skeletal cell-derived molecule sclerostin drives bone marrow adipogenesis. J Cell Physiol 233:1156-1167 |
| Bagchi, Devika P; Forss, Isabel; Mandrup, Susanne et al. (2018) SnapShot: Niche Determines Adipocyte Character I. Cell Metab 27:264-264.e1 |
Showing the most recent 10 out of 124 publications
