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Related Concept Videos

Collagens are the Major Structural Proteins of ECM01:13

Collagens are the Major Structural Proteins of ECM

Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...
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...
Structural Protein Function01:56

Structural Protein Function

Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
Collagen, the most abundant protein in mammals, is found throughout the body. In connective tissue, such as skin, ligaments, and tendons, it provides tensile strength and elasticity.  In bones and teeth, it mineralizes to form...
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...
Role of Matrix Metalloproteases in Degradation of ECM01:23

Role of Matrix Metalloproteases in Degradation of ECM

Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult body.
A...
Phases of Wound Repair01:28

Phases of Wound Repair

Following injury, the integrity of the injured tissues must be reestablished. For example, in skin tissue, wound repair involves coordination among resident skin cells, blood mononuclear cells, extracellular matrix, growth factors, and cytokines to complete the healing cascade.
Formation of Blood Clot
In case of deep injuries, trauma to blood vessels results in blood loss. In the meantime, phospholipids released from the ruptured endothelial cellular membrane are converted into arachidonic...

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Related Experiment Video

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Doxycycline Loaded Collagen-Chitosan Composite Scaffold for the Accelerated Healing of Diabetic Wounds
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Decorin modulates collagen matrix assembly and mineralization.

Yoshiyuki Mochida1, Duenpim Parisuthiman, Suchaya Pornprasertsuk-Damrongsri

  • 1Dental Research Center, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-7455, United States.

Matrix Biology : Journal of the International Society for Matrix Biology
|December 4, 2008
PubMed
Summary

Decorin (DCN) regulates bone matrix mineralization by influencing collagen assembly. Lowering DCN accelerates mineralization and bone formation, while higher DCN inhibits these processes.

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Area of Science:

  • Biochemistry
  • Bone Biology
  • Extracellular Matrix Research

Background:

  • Decorin (DCN) is a key proteoglycan in bone matrix.
  • Its role in matrix mineralization requires further investigation.

Purpose of the Study:

  • To investigate the role of Decorin (DCN) in bone matrix mineralization.
  • To characterize the effects of altered DCN expression on MC3T3-E1 cell mineralization and bone formation.

Main Methods:

  • Utilized MC3T3-E1 cell cultures with altered DCN expression (sense-DCN and antisense-DCN clones).
  • Assessed in vitro matrix mineralization, collagen fiber morphology (microscopy and ultrastructure), mineral content, and crystallinity (FTIR).
  • Conducted in vivo transplantation assays to evaluate bone-like matrix formation.

Main Results:

  • DCN expression decreased during in vitro mineralization.
  • Overexpression of DCN (S-DCN) inhibited mineralization, while reduced DCN (AS-DCN) accelerated it.
  • Altered DCN levels modulated collagen fiber thickness, shape, and organization.
  • AS-DCN transplants showed increased bone-like matrix formation with woven bone structure compared to controls.

Conclusions:

  • Decorin (DCN) plays a crucial role in regulating bone matrix mineralization.
  • DCN modulates collagen assembly, impacting mineralization processes.
  • Targeting DCN may offer therapeutic strategies for bone disorders.