Regulation and measurement of intracellular calcium May 12, 2006.
Calcium Regulation 1€¦ · Calcium Regulation 1 Dr. Sumera Gul Associate Professor Department of...
Transcript of Calcium Regulation 1€¦ · Calcium Regulation 1 Dr. Sumera Gul Associate Professor Department of...
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Calcium Regulation 1Dr. Sumera Gul
Associate Professor
Department of Physiology
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Learning objectives
• At the end of the lecture all the students should be able to:
• Explain the normal homeostasis related to calcium
• Elucidate the symptoms of hypo and hypercalcemia
• Explain the general features, functions and factors affecting secretion of Calcitonin
• Explain the general features, functions and factors affecting secretion of Parathyroid Hormone
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Normal range
Normal Calcium levels in blood: 9.4mg/dl
0.1% in ECF1% in cellsRest in bones
Phosphate
<1% in ECF14-15% in cellsAround 85% in bones
3-4 mg/dl (phosphorus)
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Calcium in Plasma
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Hormones Affecting Calcium and Phosphate levels• Calcitonin
• Parathyroid Hormone
• Other:
• Vitamin D
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Calcitonin
• Cell
• Type
• Receptor
• Mechanism of Action
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Calcitonin
• Cell: Parafollicular cells of Thyroid gland
• Type: peptide 32 aa
• Receptor: cell surface receptor
• Mechanism of Action: cAMP and PLC ?
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Function
• Inhibits osteoclastic activity
• Inhibits formations of new osteoclasts
• Decreases absorptive activities of osteoclasts
• Initially favors osteoblastic activity
• In long run reduces osteoblastic activity
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Functions
• PTH overrides calcitonin
• Increases renal excretion of calcium by inhibiting its reabsorption
• It also facilitates diuresis and increases excretion of sodium and chloride
• Decreases the absorption of calcium from GIT
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Functions
• In brain the calcitonin is reported to act via hypothalamus
• It decreases food and water intake
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Stimulatory factors
• Calcium
• Gastrin
• Estrogen
• CCK
• Glucagon
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Parathyroid Hormone
• Cell
• Type
• Receptor
• Mechanism of Action
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Parathyroid Hormone
• Cell: Chief Cells of Parathyroid gland
• Type: peptide 84 aa
• Receptor: cell surface receptor
• Mechanism of Action: cAMP and IP3 and DAG
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Function
• Increases osteoclastic activity
• Increases bone resorption
• Initially favors osteoclastic activity
• In long run it also increases osteoblastic activity
• Stimulates production of new osteoclasts
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Function• Decreases calcium excretion from kidney
• Increases calcium reabsorption from distal tubules
• Increases phosphate excretion from kidney
• Increase phosphate absorption from GIT
• Increases phosphate absorption from bone
• Increases the formation of 1,25- dihydrocholecalciferol
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Stimulatory factors
• Low Calcium
• High phosphate levels
• Decreased Vitamin D
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Inhibitory Factors
• Increased PTH
• Increased Calcium
• Increased vitamin D
• Bone resorption by disuse etc