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Related Concept Videos

Bone Remodeling01:40

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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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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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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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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Related Experiment Video

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Models of Bone Metastasis
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Tumor-induced osteomalacia.

Suzanne M Jan de Beur1

  • 1Department of Medicine, Johns Hopkins University School of Medicine, and Johns Hopkins Bayview Medical Center, Baltimore, Md 21224, USA. sjandebe@jhmi.edu

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|September 15, 2005
PubMed
Summary
This summary is machine-generated.

Tumor-induced osteomalacia (TIO) is a rare paraneoplastic syndrome causing severe hypophosphatemia and bone disease. Early diagnosis and understanding TIO pathophysiology are crucial for managing this debilitating condition.

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Area of Science:

  • Endocrinology
  • Oncology
  • Nephrology

Background:

  • Tumor-induced osteomalacia (TIO) is a rare paraneoplastic disorder.
  • It is characterized by renal phosphate wasting, hypophosphatemia, and osteomalacia.

Observation:

  • Presents a case of a 55-year-old woman with fatigue, weakness, bone pain, and fractures.
  • Diagnosis of TIO followed a prolonged clinical course and extensive evaluation.

Findings:

  • TIO results from tumor secretion of phosphaturic substances.
  • Key features include hypophosphatemia, impaired vitamin D metabolism, and bone abnormalities.

Implications:

  • Highlights the importance of recognizing TIO's distinct clinical features.
  • Discusses advancements in TIO diagnosis and pathophysiology.
  • Emphasizes the need for timely diagnosis to prevent further complications.