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Metabolic Bone Disease 5

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Metabolic Bone Disease 5 g Metabolic Bone Disease 5 Introduction, 272 History and examination, 275 Osteoporosis, 283 STRUCTURE AND FUNCTION, 272 Investigation, 276 Paget’s disease of bone, 288 Structure of bone, 272 Management, 279 Hyperparathyroidism, 290 Function of bone, 272 DISEASES AND THEIR MANAGEMENT, 280 Hypercalcaemia of malignancy, 293 APPROACH TO THE PATIENT, 275 Rickets and osteomalacia, 280 Hypocalcaemia, 295 Introduction Calcium- and phosphate-containing crystals: set in a structure• similar to hydroxyapatite and deposited in holes Metabolic bone diseases are a heterogeneous group of between adjacent collagen fibrils, which provide rigidity. disorders characterized by abnormalities in calcium At least 11 non-collagenous matrix proteins (e.g. osteo- metabolism and/or bone cell physiology. They lead to an calcin,• osteonectin): these form the ground substance altered serum calcium concentration and/or skeletal fail- and include glycoproteins and proteoglycans. Their exact ure. The most common type of metabolic bone disease in function is not yet defined, but they are thought to be developed countries is osteoporosis. Because osteoporosis involved in calcification. is essentially a disease of the elderly, the prevalence of this condition is increasing as the average age of people Cellular constituents in developed countries rises. Osteoporotic fractures may lead to loss of independence in the elderly and is imposing Mesenchymal-derived osteoblast lineage: consist of an ever-increasing social and economic burden on society. osteoblasts,• osteocytes and bone-lining cells. Osteoblasts Other pathological processes that affect the skeleton, some synthesize organic matrix in the production of new bone. of which are also relatively common, are summarized in Osteoclasts: derived from haemopoietic precursors, Table 3.20 (see Chapter 4). and• resorb bone tissue by the local release of hydrolase enzymes. Anatomy of bone Structure and function • Cortical bone: the external part of each bone consists 05 of dense skeletal tissue known as cortical (compact) bone, which contributes to most of the skeleton’s mechanical strength. Structure of bone Trabecular bone: within the vertebrae and the ends of long• bones, the internal space is filled with a fine network Bone consists of an extracellular matrix and cellular of bone tissue called trabecular (cancellous) bone. This is constituents. The structure of the extracellular matrix is in intimate contact with the bone marrow and is largely maintained throughout life by constant remodelling by its responsible for the skeleton’s metabolic role as a reservoir cellular constituents. for body calcium. In addition, trabecular elements are thought to contribute to the ability of vertebrae to with- Extracellular matrix stand compressive forces, with loss of these contributing to the vertebral collapse seen in osteoporosis. Type 1 collagen: forms a fibrillar structure by cross-linkage of• the precursor peptide procollagen, and provides tensile strength. The fibrils are generally arranged in parallel or Function of bone concentric sheets to form lamellar bone, but in newly laid Bone has two main functions: to provide an endoskeleton ‘woven bone’ this arrangement appears more random. and to act as a reservoir for body calcium (bone contains 272 g Structure and function Chapter 5 273 Osteoclast Cement line Unmineralized osteoid Area of excavated bone Osteocyte 2 lacuna 1 Mineralized bone Figure 5.1 The remodelling cycle. (1) On activation of bone resorption the surface layer of unmineralized osteoid is removed Osteoblasts and bone resorption by osteoclasts starts, Bone lining cells the membrane of the osteoclasts taking on a ruffled appearance at the site of active bone resorption. (2) When bone resorption is complete the cement line is laid down during the reversal phase. (3) The unmineralized osteoid synthesized 3 by osteoblasts fills the resorption cavity. 4 (4) The osteoid is then mineralized, the bone surface finally being covered by Unmineralized lining cells and a thin layer of unminer- osteoid alized osteoid. 1–2 kg of calcium compared with 1–2 g of calcium in the calcium. The average western diet provides 0.5–1.0 g extracellular fluid). These two functions are normally calcium/day; 20–40% of this is absorbed, which is usually independent. However, as 25% of extracellular calcium is sufficient to match minimal renal and intestinal losses replaced daily, prolonged calcium stress can ultimately (Fig. 5.2). However, if calcium intake or absorption is affect skeletal integrity. reduced, or requirements increase, a negative calcium balance may ensue. As powerful homoeostatic mechan- isms preserve the concentration of extracellular calcium Skeletal maintenance by using skeletal calcium stores, this can ultimately lead to 05 During growth, bone formation and resorption are a significant loss of calcium from bone. The homoeostatic regulated as part of the modelling process that results in mechanisms affecting bone include parathyroid hormone, the micro- and macroarchitecture of the adult skeleton. vitamin D and other factors. Modelling: involves resorption secondary to bone formation• Parathyroid hormone Remodelling: consists of repeated cycles of bone resorp- Parathyroid hormone (PTH) is an 84 amino acid polypep- tion• followed by formation, at discrete sites throughout tide that is secreted by the chief cells of the parathyroid the skeleton (Fig. 5.1) gland in response to hypocalcaemia. It is the principal reg- The mechanisms regulating modelling and remodelling ulator of extracellular calcium concentration (Fig. 5.3) are not clear, but local responses to mechanical stimuli are and increases it by: thought to have a major role. Stimulating calcium release from bone by increasing osteoclast• bone resorption Promoting renal tubular calcium reabsorption Calcium balance • • Increasing renal tubular phosphate excretion Many essential intracellular processes are critically • Enhancing renal conversion of 25-hydroxyvitamin D dependent on the concentration of ionized extracellular (25-OH-D) to 1,25-dihydroxyvitamin D (1,25-(OH)2-D). g 274 Chapter 5 Metabolic bone disease Daily oral intake of calcium 1g Absorption of calcium from the gut 300 mg/day 250 mg/day ECF 1 kg 1g Secretion of 250 mg/day calcium into the gut 150 mg/day Figure 5.2 Pathways in calcium balance. The size of the extracellular fluid (ECF) and skeletal calcium compartments (1 g Faecal excretion 850 mg/day and 1 kg, respectively), the degree of exchange between them, the daily oral intake of calcium and the daily faecal and urinary excretion of calcium refer to a typical subject in zero calcium balance. A negative calcium balance may occur if calcium intake falls, the efficiency Kidney excretion 150 mg/day of calcium absorption from the gut is reduced and/or urinary calcium excretion is increased. Vitamin D Other factors Vitamin D is a steroid hormone, which is either ingested in Other hormones: steroid hormones such as glucocorti- the diet or produced in the skin from 7-dehydrocholesterol coids,• oestrogen and androgens are thought to influence after exposure to sunlight. bone metabolism Vitamin D is a pro-hormone; the active form (1,25- • Local factors: regulate bone cell activity in response (OH)2-D) is produced by successive hydroxylations in the to systemic hormones and mechanical strain such as 05 liver and kidney by the enzymes 25-hydroxylase and 1-α- members of the transforming growth factor-β (TGF-β) hydroxylase, respectively (Fig. 5.3). 1-α-Hydroxylase is superfamily and osteoclast stimulatory factor stimulated not only by PTH, but also by low ambient Local mechanical strain: also an important controlling inorganic phosphate, growth hormone, prolactin and influence• on osteoblast and osteoclast activity, with its loss oestrogen. This enables vitamin D levels to become in disuse states leading to rapid bone loss adapted to the higher calcium requirements of growth and reproduction. Calcium measurement In conjunction with PTH, 1,25-(OH)2-D acts to main- tain serum calcium levels by: Most calcium in the blood is bound or complexed to Increasing the efficiency of calcium absorption from plasma proteins. However, only ionized calcium is bio- the• proximal small intestine logically active. • Stimulating calcium release from bone Ionized serum calcium can be measured directly, but 1,25-(OH)2-D also acts to maintain phosphate levels by conventional analysers measure only total levels (normal promoting phosphate absorption from the gut. In vitamin range 2.2–2.6 mmol). Such total levels require correction D deficiency, renal phosphate excretion is increased as a for albumin concentration because albumin is the pre- consequence of raised levels of PTH. dominant calcium binder. The most convenient correc- tion is to: g Approach to the patient Chapter 5 275 Fall in serum Diet ionized calcium 7-dehydrocholesterol Parathyroid glands Vitamin D 25-hydroxylase (liver) 25-Hydroxyvitamin D PTH 1-α-hydroxylase + (kidney) 1, 25-Dihydroxyvitamin D Figure 5.3 Regulation of calcium meta- bolism by parathyroid hormone (PTH) and vitamin D. PTH and vitamin D are the principal hormones responsible for calcium homoeostasis. Note that these two regulatory mechanisms are inter- Reduced urinary Increased bone Increased gut calcium excretion resorption calcium absorption dependent because of the stimulatory action of PTH on renal 1-a-hydroxylase. 05 Add 0.02 mmol to the total calcium level for every g/l separate disease headings). In general, people with chronic that• the albumin is below 40 g/l diseases
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