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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
Bone Remodeling01:40

Bone Remodeling

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.
Bone Cells and Tissue01:30

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the periosteum and...
What is the Skeletal System?01:02

What is the Skeletal System?

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Bone Disorders01:29

Bone Disorders

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.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
The Bone Matrix01:18

The Bone Matrix

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 acid or...

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Models of Bone Metastasis
08:49

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Published on: September 4, 2012

Osteoblast function in myeloma.

G David Roodman1

  • 1Veterans Affairs Pittsburgh Healthcare System, Research and Development, Pittsburgh, Pennsylvania, USA. roodmangd@upmc.edu

Bone
|July 6, 2010
PubMed
Summary
This summary is machine-generated.

Multiple myeloma bone disease causes destructive osteolytic lesions by suppressing osteoblast activity. Understanding these mechanisms is key to developing new treatments for this common cancer complication.

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Area of Science:

  • Oncology
  • Bone Biology
  • Cancer Microenvironment

Background:

  • Multiple myeloma (MM) frequently affects the skeleton, causing destructive osteolytic lesions.
  • The bone marrow microenvironment is crucial for MM progression and chemoresistance.
  • Osteoblast suppression by MM is a key factor in bone destruction and tumor growth.

Purpose of the Study:

  • To review the mechanisms of osteoblast suppression in multiple myeloma bone disease.
  • To discuss the impact of novel bone anabolic agents on myeloma bone disease.

Main Methods:

  • Review of existing literature on MM bone disease mechanisms.
  • Analysis of the role of the marrow microenvironment in MM.
  • Discussion of therapeutic strategies targeting bone metabolism.

Main Results:

  • MM bone disease involves impaired osteoblast differentiation due to MM cell interactions.
  • Low bone formation markers are observed in MM patients with bone lesions.
  • MM patients without bone lesions show balanced bone remodeling.

Conclusions:

  • Suppression of osteoblast activity is a critical mechanism in MM bone disease.
  • Targeting osteoblast suppression and bone remodeling holds therapeutic potential for MM patients.