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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...

Reticular Dermis

Reticular Dermis

The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...

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...

Collagens are the Major Structural Proteins of ECM

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...

Phases of Wound Repair

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...

Healing II: Complications

Healing II: Complications

Complications during healing arise when tissue repair is altered by local or systemic factors. These changes involve abnormal collagen deposition, altered biomechanics, and reduced vascular supply, impairing restoration of normal structure and function.Loss of FunctionScar tissue differs significantly from the original tissue it replaces. In the skin, fibrosis lacks adnexal structures such as hair follicles, sebaceous glands, and sweat glands. Their absence reduces tactile sensitivity, impairs...

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Related Experiment Video

Updated: Jun 23, 2026

Recombinant Collagen I Peptide Microcarriers for Cell Expansion and Their Potential Use As Cell Delivery System in a Bioreactor Model

Recombinant Collagen I Peptide Microcarriers for Cell Expansion and Their Potential Use As Cell Delivery System in a Bioreactor Model

Published on: February 7, 2018

Collagen-based dermal fillers: past, present, future.

Kimberly Cockerham¹, Victoria J Hsu

¹Oculofacial Plastics, Department of Ophthalmology, Stanford University School of Medicine, Stanford, California, USA. kpcorb@aol.com

Facial Plastic Surgery : FPS

|May 6, 2009

Summary

Collagen dermal fillers, once popular, now face declining use due to allergy risks and limited effectiveness. Newer options offer better safety and longer-lasting results for facial lines.

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An Improved Method for the Preparation of Type I Collagen From Skin

An Improved Method for the Preparation of Type I Collagen From Skin

Published on: January 21, 2014

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Last Updated: Jun 23, 2026

Recombinant Collagen I Peptide Microcarriers for Cell Expansion and Their Potential Use As Cell Delivery System in a Bioreactor Model

Recombinant Collagen I Peptide Microcarriers for Cell Expansion and Their Potential Use As Cell Delivery System in a Bioreactor Model

Published on: February 7, 2018

An Improved Method for the Preparation of Type I Collagen From Skin

An Improved Method for the Preparation of Type I Collagen From Skin

Published on: January 21, 2014

Area of Science:

Dermatology
Cosmetic Surgery
Biomaterials

Background:

Collagen was the first FDA-approved dermal filler for cosmetic facial treatments.
Bovine collagen products like Zyderm and Zyplast were introduced in the early 1980s.
The market for dermal fillers has significantly evolved over the past two decades.

Purpose of the Study:

To review the historical benefits and risks associated with collagen injections.
To discuss typical outcomes and patient experiences with collagen fillers.
To analyze the reasons for collagen's declining market share in facial aesthetics.

Main Methods:

Historical review of collagen filler approvals and usage.
Analysis of reported side effects, particularly allergic reactions.
Comparison of collagen filler efficacy and longevity with newer alternatives.
Examination of histopathologic data on collagen persistence.

Main Results:

Collagen injections require mandatory skin testing, causing inconvenience and potential delays.
A negative skin test does not eliminate the risk of allergic reactions or adverse events.
Perceived clinical efficacy of collagen fillers is often short-lived, with persistence limited to approximately 9 months.
Hyaluronic acid and other newer fillers have led to a significant loss of market share for collagen.

Conclusions:

The risks, including allergies, and limited duration of benefit have diminished the role of collagen fillers.
The inconvenience of mandatory skin testing further contributes to the decline of collagen use.
Advancements in dermal filler technology have provided safer and more effective alternatives to collagen.