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Glucose Homeostasis: Regulation of Blood Glucose01:02

Glucose Homeostasis: Regulation of Blood Glucose

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Carbohydrates consumed through foods are converted into glucose, a crucial energy source for the body. In the prandial state, high blood glucose levels stimulate the secretion of insulin from the pancreas. Insulin inhibits hepatic glucose production and stimulates glucose uptake and metabolism by muscle and adipose tissue. The excess glucose is converted into glycogen and stored in the liver and muscles.
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Hormones Regulating Blood Glucose01:16

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Insulin is released by beta cells of the pancreas when blood glucose levels are high. It facilitates glucose absorption and utilization in insulin-dependent cells with insulin receptors on their plasma membranes. Insulin promotes glucose uptake by increasing the number of glucose transport proteins in the cell membrane, allowing glucose to enter the cell. As a result, glucose utilization and ATP production are enhanced.
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Overview of Carbohydrate Metabolism01:19

Overview of Carbohydrate Metabolism

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Carbohydrate metabolism is a fundamental biochemical process that ensures a constant supply of energy to living cells. The most important carbohydrate is glucose, which can be broken down via glycolysis to enter into the Krebs cycle and eventually lead to the production of ATP through oxidative phosphorylation.
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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.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
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The Bone Matrix01:18

The Bone Matrix

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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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Glucose Homeostasis: Pancreatic Islets and Insulin Secretion01:27

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The pancreatic islets comprising only 1%-2% of the volume are highly vascularized and innervated mini-organs. They contain five endocrine cell types, including β cells that secrete insulin, which is synthesized as a single polypeptide chain, preproinsulin, processed to proinsulin, and finally to insulin and C-peptide. This process is complex and regulated, involving the Golgi complex, the endoplasmic reticulum, and the secretory granules of the β cell.
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Using Real-Time Cell Metabolic Flux Analyzer to Monitor Osteoblast Bioenergetics
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Glucose metabolism in bone.

Courtney M Karner1, Fanxin Long2

  • 1Department of Orthopaedic Surgery, Duke Orthopaedic Cellular, Developmental, and Genome Laboratories, Department of Cell Biology, Duke University School of Medicine, Durham, NC 27710, USA.

Bone
|August 28, 2017
PubMed
Summary
This summary is machine-generated.

Diabetes disrupts bone health by altering glucose metabolism, affecting bone-forming osteoblasts and bone-resorbing osteoclasts. Understanding these metabolic pathways is key to developing new bone therapeutics for conditions like osteoporosis.

Keywords:
BoneDiabetesGlucoseGlycolysisMetabolismMitochondriaOsteoblastOsteoclastOsteoporosisOxidative phosphorylation (OXPHOS)

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Area of Science:

  • Bone biology
  • Metabolic disorders
  • Endocrinology

Background:

  • The adult skeleton maintains homeostasis via balanced osteoblast and osteoclast activity.
  • Diabetes mellitus dysregulates systemic glucose metabolism, potentially impairing bone health and increasing fracture risk.
  • Understanding glucose metabolism in bone cells is crucial for addressing diabetes-related bone fragility.

Purpose of the Study:

  • To review current knowledge on glucose metabolism's role in bone remodeling.
  • To explore the impact of dysregulated glucose metabolism on osteoblast and osteoclast function.
  • To identify therapeutic targets for bone disorders associated with diabetes.

Main Methods:

  • Literature review of recent studies on glucose metabolism and bone cells.
  • Analysis of the interplay between glucose pathways and key regulatory factors in osteogenesis and osteoclastogenesis.
  • Synthesis of findings on metabolic plasticity in bone cell differentiation.

Main Results:

  • Glucose metabolism significantly influences osteoblast and osteoclast differentiation and function.
  • Intersections between glucose metabolic pathways and known growth/transcription factors in bone cells are increasingly recognized.
  • Dysregulated glucose metabolism in diabetes is linked to increased bone frailty.

Conclusions:

  • Glucose metabolism is a critical regulator of bone cell activity and bone homeostasis.
  • Targeting glucose metabolic pathways in osteoblasts and osteoclasts offers potential for novel therapeutic strategies.
  • Further research into bone cell metabolism is essential for treating metabolic bone diseases.