Pathophysiology of
Skeletal Metastasis
Normal bone is in a constant dynamic state of resorption
and formation mediated by osteoclasts (lytic or destructive
cells) and osteoblasts (bone-forming cells). The remodeling
process involves about 10% of the bone surface at any time
(Kanis & McCloskey, 1997), but an increase in turnover can
be stimulated by several disorders, such as renal osteodystrophy,
osteoporosis, or Paget’s disease (Mundy, 1999). A quantitative
relationship exists between the amount of bone lost
and formed. In normal bone, the rate of bone resorption approximates
the rate of formation and mineralization. In disease
states, such as bone metastasis, an imbalance occurs between
bone formation and resorption. Most of the calcium in
the body is stored in bone, while much of the circulating calcium
is bound to albumin. When the normal rate of bone turnover
is disrupted, excess calcium is released into the circulatory
system, potentially resulting in hypercalcemia
Pathophysiology ofSkeletal MetastasisNormal bone is in a constant dynamic state of resorptionand formation mediated by osteoclasts (lytic or destructivecells) and osteoblasts (bone-forming cells). The remodelingprocess involves about 10% of the bone surface at any time(Kanis & McCloskey, 1997), but an increase in turnover canbe stimulated by several disorders, such as renal osteodystrophy,osteoporosis, or Paget’s disease (Mundy, 1999). A quantitativerelationship exists between the amount of bone lostand formed. In normal bone, the rate of bone resorption approximatesthe rate of formation and mineralization. In diseasestates, such as bone metastasis, an imbalance occurs betweenbone formation and resorption. Most of the calcium inthe body is stored in bone, while much of the circulating calciumis bound to albumin. When the normal rate of bone turnoveris disrupted, excess calcium is released into the circulatorysystem, potentially resulting in hypercalcemia
การแปล กรุณารอสักครู่..