TY - JOUR
T1 - Exercise and Diet
T2 - Uncovering Prospective Mediators of Skeletal Fragility in Bone and Marrow Adipose Tissue
AU - Little-Letsinger, Sarah E.
AU - Pagnotti, Gabriel M.
AU - McGrath, Cody
AU - Styner, Maya
N1 - Funding Information:
This review was supported by funds from the NIH/NIAMS R01AR073264 and NIH/NCATS KL2TR002490.
Publisher Copyright:
© 2020, Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2020/12
Y1 - 2020/12
N2 - Purpose of Review: To highlight recent basic, translational, and clinical works demonstrating exercise and diet regulation of marrow adipose tissue (MAT) and bone and how this informs current understanding of the relationship between marrow adiposity and musculoskeletal health. Recent Findings: Marrow adipocytes accumulate in the bone in the setting of not only hypercaloric intake (calorie excess; e.g., diet-induced obesity) but also with hypocaloric intake (calorie restriction; e.g., anorexia), despite the fact that these states affect bone differently. With hypercaloric intake, bone quantity is largely unaffected, whereas with hypocaloric intake, bone quantity and quality are greatly diminished. Voluntary running exercise in rodents was found to lower MAT and promote bone in eucaloric and hypercaloric states, while degrading bone in hypocaloric states, suggesting differential modulation of MAT and bone, dependent upon whole-body energy status. Energy status alters bone metabolism and bioenergetics via substrate availability or excess, which plays a key role in the response of bone and MAT to mechanical stimuli. Summary: Marrow adipose tissue (MAT) is a fat depot with a potential role in—as well as responsivity to—whole-body energy metabolism. Understanding the localized function of this depot in bone cell bioenergetics and substrate storage, principally in the exercised state, will aid to uncover putative therapeutic targets for skeletal fragility.
AB - Purpose of Review: To highlight recent basic, translational, and clinical works demonstrating exercise and diet regulation of marrow adipose tissue (MAT) and bone and how this informs current understanding of the relationship between marrow adiposity and musculoskeletal health. Recent Findings: Marrow adipocytes accumulate in the bone in the setting of not only hypercaloric intake (calorie excess; e.g., diet-induced obesity) but also with hypocaloric intake (calorie restriction; e.g., anorexia), despite the fact that these states affect bone differently. With hypercaloric intake, bone quantity is largely unaffected, whereas with hypocaloric intake, bone quantity and quality are greatly diminished. Voluntary running exercise in rodents was found to lower MAT and promote bone in eucaloric and hypercaloric states, while degrading bone in hypocaloric states, suggesting differential modulation of MAT and bone, dependent upon whole-body energy status. Energy status alters bone metabolism and bioenergetics via substrate availability or excess, which plays a key role in the response of bone and MAT to mechanical stimuli. Summary: Marrow adipose tissue (MAT) is a fat depot with a potential role in—as well as responsivity to—whole-body energy metabolism. Understanding the localized function of this depot in bone cell bioenergetics and substrate storage, principally in the exercised state, will aid to uncover putative therapeutic targets for skeletal fragility.
KW - Bone marrow cells
KW - Caloric restriction
KW - Exercise
KW - Marrow adipose tissue (MAT)
KW - Mesenchymal stem cell (MSC)
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U2 - 10.1007/s11914-020-00634-y
DO - 10.1007/s11914-020-00634-y
M3 - Review article
C2 - 33068251
AN - SCOPUS:85092604715
SN - 1544-1873
VL - 18
SP - 774
EP - 789
JO - Current Osteoporosis Reports
JF - Current Osteoporosis Reports
IS - 6
ER -