Elastin
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Elastin is one of the most important structural proteins of the body, responsible for the elasticity and ability of tissues to return to their original shape after stretching. In the skin, blood vessels, ligaments, lungs, or tendons, it forms a network of elastic fibers, thanks to which tissues maintain elasticity despite daily mechanical loads. It is elastin that makes young skin quickly regain its original appearance after being compressed or stretched.
Unlike many other proteins in the body, elastin is produced primarily during fetal life and early childhood. In the adult body, its synthesis is very limited, which is why damaged elastin fibers practically do not undergo full regeneration. For this reason, protecting existing elastin is one of the most important elements of skin aging prevention.
Progressive degradation of elastin leads to loss of firmness, skin sagging, deepening wrinkles, and a reduced ability of tissues to resist the force of gravity. Modern aesthetic medicine is unable to completely recreate the natural network of elastin fibers, but it can effectively stimulate the remodeling processes of the extracellular matrix and improve the biomechanical properties of the skin.
Elastin - what it is
Elastin is an insoluble fibrous protein belonging to the components of the extracellular matrix (ECM – extracellular matrix). It is the main building block of elastic fibers, which are responsible for the extensibility and elasticity of tissues.
The formation of elastin fibers is a multi-step process. Fibroblasts first synthesize tropoelastin – a soluble precursor of elastin. Subsequently, with the participation of the enzyme lysyl oxidase (LOX), the formation of durable cross-links occurs, which give the fibers extraordinary mechanical strength and the ability to stretch repeatedly without damage.
In the skin, elastin fibers:
- enable skin stretching and its rapid return to its original shape,
- cooperate with collagen fibers, ensuring appropriate resilience,
- stabilize the architecture of the dermis,
- influence tissue tension,
- limit the formation of permanent skin deformations during facial expressions.
Elastin constitutes only about 2–4% of the dry mass of the dermis, however, its functional significance is enormous. Even minor damage to elastic fibers leads to a noticeable deterioration of skin quality.
Elastin - how it differs from collagen
Collagen and elastin are often mentioned together, however, they perform completely different functions. It can be said that collagen is responsible for skin strength, while elastin is responsible for its elasticity.
The most important differences include:
- Collagen forms the scaffold of the skin – it is responsible for its density, mechanical resistance, and maintaining the proper structure.
- Elastin enables tissue deformation – it allows the skin to stretch and return to its original shape.
- Collagen is much more abundant – it accounts for about 70–80% of the dry mass of the dermis, while elastin makes up only a few percent.
- Collagen is synthesized more actively throughout life – although its production decreases with age, the body still retains the ability to remodel it.
- Elastin practically does not renew itself after the growth period ends – therefore, its degradation is almost irreversible.
The skin aging process involves simultaneous changes in both proteins:
- a decrease in the amount of collagen causes thinning of the skin,
- damage to elastin leads to a loss of elasticity,
- disruption of the mutual organization of fibers deepens laxity,
- the skin's resistance to daily mechanical stress decreases.
Therefore, effective anti-aging therapies focus on improving the entire extracellular matrix, rather than solely on stimulating collagen production.
Elastin - why skin loses its elasticity with age
The process of losing skin elasticity begins much earlier than the first visible wrinkles appear. Already around the age of 25–30, a gradual deterioration in the quality of supporting fibers is observed.
The most important mechanisms include:
- reduced fibroblast activity,
- limited production of new extracellular matrix components,
- gradual degradation of existing elastin fibers,
- accumulation of chronic micro-inflammation associated with aging (inflammaging),
- deterioration of microcirculation,
- increased activity of enzymes degrading the extracellular matrix (MMP metalloproteinases).
As a result, this leads to:
- reduced skin elasticity,
- loss of tissue tension,
- development of laxity,
- deepening of furrows and wrinkles,
- reduced skin resistance to gravitational forces.
This process becomes visible particularly quickly in the areas of the cheeks, jawline, neck, eyelids, and décolletage, where elastic fibers play a key role in maintaining tissue tension.
Elastin - what destroys it faster than the passage of time
Natural aging is responsible for only a part of elastin loss. Environmental factors, collectively referred to as extrinsic aging, have a significantly greater impact.
The strongest factor destroying elastin fibers is ultraviolet radiation.
Under the influence of UVA radiation, there is:
- activation of metalloproteinases (MMP),
- degradation of elastin fibers,
- formation of abnormal elastin (solar elastosis),
- disruption of dermal architecture,
- chronic damage to fibroblasts.
This process is referred to as solar elastosis. In histopathological examinations, instead of normal thin fibers, chaotic, thickened, and abnormally organized deposits of elastotic material appear, which do not fulfill their biomechanical function.
Other factors accelerating elastin degradation include:
- cigarette smoking,
- air pollution,
- chronic oxidative stress,
- a diet poor in antioxidants,
- excessive exposure to infrared radiation and high temperature,
- chronic skin inflammation,
- sleep deprivation,
- high level of protein glycation associated with excessive consumption of simple sugars.
In practice, this means that proper photoprotection can protect elastin more effectively than many subsequent regenerative therapies.
Elastin - can aesthetic treatments stimulate its rebuilding
Modern aesthetic medicine cannot recreate the natural network of elastin fibers to the extent that the body creates it during development. However, it is possible to stimulate fibroblasts to remodel the extracellular matrix and create new elastic fibers to a limited extent, especially as part of repair processes.
The best results are achieved through therapies that induce controlled skin remodeling.
The methods with the best-documented effects include:
- microneedle radiofrequency – initiates the healing process leading to the remodeling of collagen and elastic fibers,
- ablative and non-ablative fractional lasers – stimulate dermal remodeling and fibroblast activity,
- focused ultrasound (HIFU) – improve the tension of deep tissue layers and induce regenerative processes,
- tissue biostimulators – activate fibroblasts for increased production of extracellular matrix components,
- regenerative mesotherapy with appropriately selected preparations – supports fibroblast metabolism and improves the regeneration environment,
- combined procedures (combination therapies) that utilize different mechanisms of tissue stimulation.
It should be emphasized, however, that the effects of these therapies result primarily from the remodeling of the entire extracellular matrix, including collagen, elastin, proteoglycans, and glycosaminoglycans. As a result, the skin regains greater elasticity, better tension, and higher mechanical resistance, even though the complete restoration of the original amount of elastin remains biologically impossible.
The greatest benefits come from starting preventive measures early. Protection against UV radiation, a healthy lifestyle, and appropriately selected stimulating treatments allow the proper structure of the skin's supporting fibers to be maintained for many years and significantly slow down the development of aging signs.
