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2015 ; 6
(6
): 273-86
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The obesity of bone
#MMPMID26623005
Greco EA
; Lenzi A
; Migliaccio S
Ther Adv Endocrinol Metab
2015[Dec]; 6
(6
): 273-86
PMID26623005
show ga
During the last decades, obesity and osteoporosis have become important global
health problems, and the belief that obesity is protective against osteoporosis
has recently come into question. In fact, some recent epidemiologic and clinical
studies have shown that a high level of fat mass might be a risk factor for
osteoporosis and fragility fractures. Several potential mechanisms have been
proposed to explain the complex relationship between adipose tissue and bone.
Indeed, adipose tissue secretes various molecules, named adipokines, which are
thought to have effects on metabolic, skeletal and cardiovascular systems.
Moreover, fat tissue is one of the major sources of aromatase, an enzyme that
synthesizes estrogens from androgen precursors, hormones that play a pivotal role
in the maintenance of skeletal homeostasis, protecting against osteoporosis.
Moreover, bone cells express several specific hormone receptors and recent
observations have shown that bone-derived factors, such as osteocalcin and
osteopontin, affect body weight control and glucose homeostasis. Thus, the
skeleton is considered an endocrine target organ and an endocrine organ itself,
likely influencing other organs as well. Finally, adipocytes and osteoblasts
originate from a common progenitor, a pluripotential mesenchymal stem cell, which
has an equal propensity for differentiation into adipocytes or osteoblasts (or
other lines) under the influence of several cell-derived transcription factors.
This review will highlight recent insights into the relationship between fat and
bone, evaluating both potential positive and negative influences between adipose
and bone tissue. It will also focus on the hypothesis that osteoporosis might be
considered the obesity of bone.