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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

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Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.
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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Synthesis and Functions of Calcitonin00:51

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Calcitonin, a vital polypeptide hormone, regulates calcium levels within body fluids. It is released by the parafollicular cells, also known as C cells, situated in the follicular epithelium of the thyroid gland. Calcitonin responds to fluctuations in blood calcium levels and the influence of gastrointestinal hormones like gastrin and cholecystokinin.
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The Parathyroid Glands00:59

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The two pairs of parathyroid glands embedded within the posterior surface of the thyroid gland are restricted by a dense capsule around them. These glands comprise two distinct cell populations—parathyroid oxyphil and parathyroid principal cells- pivotal in calcium homeostasis.
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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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A Semi-Automated and Reproducible Biological-Based Method to Quantify Calcium Deposition In Vitro
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[Hypercalcemia].

Ralph Kettritz1

  • 1Nephrologie und Internistische Intensivmedizin, Charité-Universitätsmedizin Berlin und Experimental and Clinical Research Center, a joint cooperation between the Charité Medical Faculty and the Max-Delbrück-Center for Molecular Medicine Berlin-Buch.

Deutsche Medizinische Wochenschrift (1946)
|February 5, 2020
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Summary
This summary is machine-generated.

Hypercalcemia results from calcium imbalance. Understanding the calcium-sensing receptor (CaSR) and its role in calcium regulation is crucial for diagnosing and treating conditions like hyperparathyroidism.

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Area of Science:

  • Biochemistry
  • Endocrinology
  • Nephrology

Background:

  • Calcium is essential for vital physiological processes including neuromuscular function, blood coagulation, and cellular signal transduction.
  • Disruptions in calcium homeostasis, involving intestinal absorption, bone metabolism, and kidney excretion, can lead to hypercalcemia.
  • The distinction between total and ionized serum calcium levels is critical for accurate hypercalcemia diagnosis.

Purpose of the Study:

  • To elucidate the role of the calcium-sensing receptor (CaSR) in regulating calcium balance.
  • To highlight the clinical significance of CaSR in diagnosing and managing hyperparathyroidism.
  • To discuss the dual impact of diuretics on calcium levels.

Main Methods:

  • Review of physiological mechanisms governing calcium homeostasis.
  • Analysis of the function of the calcium-sensing receptor (CaSR) in endocrine and renal pathways.
  • Examination of clinical implications of calcium level imbalances.

Main Results:

  • The calcium-sensing receptor (CaSR) plays a key role in modulating parathyroid hormone secretion and renal calcium reabsorption.
  • Understanding CaSR actions is vital for diagnosing and treating hyperparathyroidism.
  • Diuretics present a complex relationship with calcium, capable of inducing hypercalcemia while also serving as a therapeutic option to reduce it.

Conclusions:

  • Calcium homeostasis is tightly regulated by complex interactions.
  • The calcium-sensing receptor (CaSR) is a critical regulator of calcium levels and a key target for understanding and managing related disorders.
  • Clinical management of calcium imbalances requires consideration of factors like CaSR function and diuretic use.