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Related Concept Videos

Skeleton and Calcium Homeostasis01:21

Skeleton and Calcium Homeostasis

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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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Hormones and Bone Tissue01:17

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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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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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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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Related Experiment Video

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Using Real-Time Cell Metabolic Flux Analyzer to Monitor Osteoblast Bioenergetics
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Extracellular purines and bone homeostasis.

Ankita Agrawal1, Niklas R Jørgensen2

  • 1Department of Clinical Biochemistry, Rigshospitalet, Denmark.

Biochemical Pharmacology
|January 22, 2021
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Purinergic signaling, involving adenosine derivatives, is crucial for bone health and metabolism. Targeting these pathways offers promising treatments for skeletal disorders and bone loss.

Keywords:
BoneOsteoblastOsteoclastPurinergic signalingPurines

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Area of Science:

  • Skeletal Biology
  • Purinergic Signaling
  • Bone Metabolism

Background:

  • Bone health relies on balanced bone formation and resorption.
  • Extracellular purines, regulated by purinoceptors, are vital for bone homeostasis.
  • Adenosine derivatives influence bone cells directly and alongside hormones.

Purpose of the Study:

  • To explore the role of purinergic signaling in bone metabolism and homeostasis.
  • To investigate the impact of adenosine derivatives in physiological and pathological bone conditions.
  • To highlight therapeutic potential targeting the purinergic pathway for skeletal disorders.

Main Methods:

  • Review of existing literature on purinergic signaling in bone.
  • Analysis of studies involving model organisms and pathological conditions.
  • Examination of the roles of CD39, CD73 enzymes, and purinoceptors.

Main Results:

  • Adenosine derivatives are released by osteoblasts and osteoclasts, affecting bone cells.
  • Deviations in extracellular adenosine levels trigger complex, sometimes opposing, effects on bone.
  • Purinergic signaling is implicated in bone injury, inflammation, and cancer-related bone diseases.

Conclusions:

  • The net effect of adenosine derivatives in bone depends on CD39, CD73, and receptor activity.
  • Dysregulated purinergic signaling contributes to skeletal fragility and fractures.
  • Targeting components of the purinergic pathway presents a promising therapeutic strategy for skeletal disorders.