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Matrix Proteoglycans and Glycoproteins

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...

Proteoglycans

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,...

Glycosaminoglycans

Glycosaminoglycans

Glycosaminoglycans (GAGs), also known as mucopolysaccharides, are long and linear polymers comprising of specific repeating disaccharides - the amino sugar that can be N-acetylglucosamine or N-acetylgalactosamine, and a uronic acid that is usually glucuronic acid or iduronic acid.
GAGS are found in the extracellular matrix of vertebrates, invertebrates, and bacteria. Due to their polar nature they attract water, and serve as excellent lubricants or shock absorbers in an animal body.
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Collagens are the Major Structural Proteins of ECM

Collagens are the Major Structural Proteins of ECM

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Fibril-associated Collagen

Fibril-associated Collagen

Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
For example, the type II collagen fibrils in cartilage have covalently bound type IX fibril-associated collagens at regular intervals. Other types of fibril-associated collagens are...

Type IV Collagen of Basal Lamina

Type IV Collagen of Basal Lamina

Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...

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Related Experiment Video

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Imaging-Guided Bioreactor for Generating Bioengineered Airway Tissue

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Proteoglycan and collagen expression during human air conducting system development.

C Godoy-Guzmán¹, S San Martin, J Pereda

¹Department of Human Embryology, School of Medicine, Universidad de Santiago de Chile, Usach, Santiago. carlos.godoy@usach.cl

European Journal of Histochemistry : EJH

|October 3, 2012

Summary

Extracellular matrix proteins like collagens and proteoglycans are crucial for human lung development. Their distribution at the epithelial-mesenchymal interface supports the branching of the bronchial tree during fetal lung formation.

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Area of Science:

Developmental Biology
Cell Biology
Histology

Background:

The lung develops through a dichotomous budding process driven by epithelial-mesenchymal interactions.
Extracellular matrix (ECM) proteins are hypothesized to play a role in these developmental processes.
Understanding the specific roles of ECM components like proteoglycans and collagens is key to understanding lung morphogenesis.

Purpose of the Study:

To investigate the expression and distribution of specific proteoglycans and collagens during early human lung development.
To elucidate the role of these extracellular matrix proteins in the formation of the air-conducting system.

Main Methods:

Utilized light microscopy and immunohistochemistry on human embryo lungs (8-10 weeks post-fertilization and 11-14 weeks gestational age).
Evaluated the expression patterns of collagens (Types I, III, VI) and proteoglycans (decorin, biglycan, lumican).

Main Results:

Decorin, lumican, and all investigated collagen types were found at the epithelium-mesenchymal interface, forming a sheath around bronchiolar ducts.
Biglycan showed expression in the endothelial cells and smooth muscle of blood vessels.
A similar distribution pattern was observed between collagens and proteoglycans during early human fetal lung development.

Conclusions:

The co-localization of collagens and proteoglycans at the epithelium-mesenchymal interface suggests a significant role in bronchial tree dichotomous branching.
These findings provide novel insights into the involvement of extracellular matrix proteins in establishing the air-conducting system during human fetal lung development.