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Related Concept Videos

Proteoglycans01:05

Proteoglycans

Glycans, a class of complex heterogeneous molecules, can be covalently attached to proteins to form glycosylated proteins that regulate various physiological and pathological processes. Glycosylated proteins or glycoproteins comprise N-linked and O-linked oligosaccharides. O-glycosylation is the most common type of protein glycosylation. Here, glycans attach to the oxygen atom of the hydroxyl groups of Serine or Threonine residues. O-linked glycosylation occurs later in protein processing,...
Matrix Proteoglycans and Glycoproteins01:21

Matrix Proteoglycans and Glycoproteins

Proteoglycans are extensively glycosylated proteins, commonly found in the extracellular matrix, interwoven with collagen fibers. Hyaline cartilage, the most common type of cartilage in the body, consists of short and dispersed collagen fibers associated with large amounts of proteoglycans. These proteoglycans have long negative charges that attract cations, which in turn attract water molecules. This influx of ions and water molecules swells up the proteoglycan like a water-soaked gel that can...
The Tumor Microenvironment02:17

The Tumor Microenvironment

Every normal cell or tissue is embedded in a complex local environment called stroma, consisting of different cell types, a basal membrane, and blood vessels. As normal cells mutate and develop into cancer cells, their local environment also changes to allow cancer progression. The tumor microenvironment (TME) consists of a complex cellular matrix of stromal cells and the developing tumor. The cross-talk between cancer cells and surrounding stromal cells is critical to disrupt normal tissue...
mTOR Signaling and Cancer Progression03:03

mTOR Signaling and Cancer Progression

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.
The mTOR pathway or the...
Tumor Progression02:07

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...
Tumor Progression02:07

Tumor Progression

Tumor progression is a phenomenon where the pre-formed tumor acquires successive mutations to become clinically more aggressive and malignant. In the 1950s, Foulds first described the stepwise progression of cancer cells through successive stages.
Colon cancer is one of the best-documented examples of tumor progression. Early mutation in the APC gene in colon cells causes a small growth on the colon wall called a polyp. With time, this polyp grows into a benign, pre-cancerous tumor. Further...

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Three-Dimensional Bone Extracellular Matrix Model for Osteosarcoma
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Proteoglycans on bone tumor development.

Carmen Ruiz Velasco1, Sylvia Colliec-Jouault, Françoise Redini

  • 1Université de Nantes, France.

Drug Discovery Today
|June 18, 2010
PubMed
Summary
This summary is machine-generated.

Proteoglycans regulate bone resorption and tumor growth. These extracellular matrix molecules influence osteoclast and osteoblast activity, impacting bone metastases and cancer progression.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Oncology

Background:

  • Proteoglycans are key extracellular matrix components influencing bone cell activity.
  • Maintaining balanced osteoblast and osteoclast populations is vital for bone homeostasis.

Purpose of the Study:

  • To elucidate the role of proteoglycans in bone resorption and tumor development.
  • To investigate proteoglycans' involvement in the bone-tumor microenvironment.

Main Methods:

  • Analysis of proteoglycan interactions with bone cells.
  • Assessment of proteoglycans' impact on osteoprotegerin and RANKL bioactivity.
  • Evaluation of proteoglycans in bone tumor models.

Main Results:

  • Proteoglycans promote bone resorption by modulating osteoprotegerin and receptor activator of NF-kappaB ligand (RANKL).
  • Proteoglycans influence tumor development, including bone metastases.
  • A dual role in bone resorption and tumor progression is highlighted.

Conclusions:

  • Proteoglycans are critical regulators in the vicious cycle of tumor proliferation and bone resorption.
  • Targeting proteoglycans offers potential therapeutic strategies for bone-related cancers and metastases.