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Related Concept Videos

Bone Remodeling01:40

Bone Remodeling

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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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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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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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The mammalian target of rapamycin or mTOR protein was discovered in 1994 due to its direct interaction with rapamycin. The protein gets its name from a yeast homolog called TOR. The mTOR protein complex in mammalian cells plays a major role in balancing anabolic processes such as the synthesis of proteins, lipids, and nucleotides and catabolic processes, such as autophagy in response to environmental cues, such as availability of nutrients and growth factors.
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Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
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Related Experiment Video

Updated: Jun 30, 2025

Development of a Human Preclinical Model of Osteoclastogenesis from Peripheral Blood Monocytes Co-cultured with Breast Cancer Cell Lines
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Bone Endosteal Mimics Regulates Breast Cancer Development and Phenotype.

Noa Ben Ghedalia Peled1, Dane K Hoffman2,3, Livnat Barsky1

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|March 19, 2024
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Summary

This study used a 3D model to mimic the bone microenvironment, revealing that it can halt breast cancer cell proliferation while also increasing their invasiveness, suggesting a dual role in metastasis progression.

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Methods for Culturing Human Femur Tissue Explants to Study Breast Cancer Cell Colonization of the Metastatic Niche
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Area of Science:

  • Biomaterials Science
  • Cancer Biology
  • Oncology

Background:

  • Bone metastasis is a significant challenge in breast cancer treatment, often leading to poor patient outcomes.
  • The specific bone microenvironment plays a critical role in the progression of cancer metastasis, but remains poorly understood.
  • Current understanding of the mechanisms driving bone metastasis progression is limited.

Purpose of the Study:

  • To investigate the effects of an endosteal bone microenvironment mimic on breast cancer cell behavior.
  • To explore the dual role of biomaterial interactions in regulating cancer cell fate and metastasis.

Main Methods:

  • Utilized a bioactive three-dimensional (3D) scaffold designed to replicate the endosteal bone microenvironment.
  • Cultured MDA-MB-231 and MCF7 breast cancer cells on the 3D scaffolds.
  • Analyzed cell proliferation, gene expression (c-Myc, cyclin D, KI67), and invasiveness over time.

Main Results:

  • Close cell-biomaterial interactions modulated cancer cell proliferation and key cell cycle regulatory proteins (c-Myc, cyclin D, KI67), inducing cell cycle arrest.
  • Invasion assays demonstrated enhanced invasiveness of breast cancer cells within the biomimetic microenvironment.
  • The endosteal mimicking signals exhibited a dual effect, promoting both cell cycle arrest and aggressive cellular states.

Conclusions:

  • Bioactive 3D models can effectively mimic the endosteal bone microenvironment to study cancer metastasis.
  • Endosteal mimicking signals present a complex, dual role in breast cancer bone metastasis, influencing cell cycle regulation and invasiveness.
  • Further research into these signals could reveal novel therapeutic strategies for managing bone metastasis.