An international research team led by Hiroshima University has discovered a potential early indicator of changes in skin collagen. The study, published in ACS Nano, suggests that the internal organization of collagen begins to change even before the fibers visibly thin, break, or fall apart.
This could be particularly interesting for skin research, as changes in collagen are among the most important processes associated with skin aging and declining skin quality. When the collagen structure loses its original order, the skin can lose firmness and elasticity over time. This becomes apparent, among other things, through thinner, less firm skin, wrinkles, and slower recovery from stress or injury.
The Skin may Already be Damaged, Even if it Isn’t Yisible Yet
Collagen is one of the skin’s most important structural proteins. It forms a dense network within the connective tissue and plays a key role in ensuring that the skin remains stable, elastic, and resilient. Together with elastin, hyaluronic acid, and other components of the skin, collagen gives the tissue its firmness and supports its ability to regain stability after being stretched. An intact collagen network also helps the skin retain its shape and prevents it from losing its elasticity too quickly.
As we age, this network changes. The body gradually produces less new collagen, while at the same time existing collagen is broken down and damaged to a greater extent. The fibers are then no longer as dense and well-organized as they were in younger years. As a result, the skin can become thinner and less elastic, its firmness decreases, and wrinkles can form more easily.
This process is not influenced solely by natural aging. UV radiation, smoking, environmental stressors, and chronic inflammatory processes can also damage the collagen network. Long-term sun exposure, in particular, plays a significant role, as it can trigger processes in the skin that accelerate collagen breakdown. Over time, this can cause the fibers to become thinner, more brittle, and less firmly connected to one another.
The new study now suggests that the process may begin even earlier than previously observed. According to the study, sufficient collagen may still be present and the fibers may appear relatively normal on the outside, even as their internal, precise organization is already deteriorating. To put it simply, one could compare it to a rope: From the outside, it still looks stable at first, even though the individual fibers inside are already losing their original arrangement. Only later does the change become apparent on the outside as well.
It’s Not Just the Amount of Collagen That Matters
For the skin, this is an important insight: It is not just the amount of collagen present that determines how stable and resilient the connective tissue is. Equally important is how well the collagen molecules are organized and how they are arranged within the tissue network. Even if there is still sufficient collagen present, its function can be impaired if this precise structure is increasingly lost.
It was precisely these subtle changes that the researchers were able to detect using their specialized investigative methods. Among other things, they examined what is known as the chirality of collagen—put simply, a specific spatial “handedness” and orientation of its molecular structures. This characteristic arrangement is part of collagen’s complex organization. If it changes, this may indicate that the collagen network is already losing its original order and stability.
For the skin, this could mean that connective tissue that appears to be intact is already undergoing initial “invisible” aging or damage processes. Thus, the skin does not yet need to show any obvious wrinkles or visible sagging on the surface, even though the structure of its collagen has already changed. This allowed the researchers to detect changes that might not yet have been visible using conventional imaging techniques. Until now, studies of collagen have often focused on whether the fibers are already thinner, fragmented, or significantly altered. The new method, however, starts one step earlier: It does not wait to detect the visible breakdown of collagen fibers, but instead focuses on changes in their internal organization.
Why This Could be Important for Skin Aging
These findings could help us better understand why the skin changes over the course of a lifetime. Wrinkles, sagging skin, and a loss of elasticity need not be the first signs of collagen aging. They could be preceded by changes at the molecular level much earlier on. This means that the skin may still appear relatively smooth and intact on the outside, while the first changes are already taking place in the connective tissue.
Collagen is particularly important here because it gives the skin stability and firmness. As we age, the body produces less new collagen, while existing collagen is increasingly broken down or damaged. As a result, the connective tissue gradually loses its original structure. The skin can become thinner and less elastic, and wrinkles form more easily. At the same time, the skin’s ability to fully regenerate after stress or injury decreases.
Of particular interest here is the influence of UV radiation. Sunlight can trigger processes in the skin that accelerate collagen breakdown while simultaneously impairing the formation of new collagen. Over many years, this effect can accumulate and contribute to what is known as photoaging—that is, skin changes caused primarily by chronic sun exposure. For this reason, consistent UV protection is considered one of the most important measures for counteracting premature skin aging.
Smoking, an unbalanced diet, chronic stress, and repeated oxidative or inflammatory stress can also influence skin aging. They can impair the skin’s natural repair mechanisms and promote processes that contribute to the breakdown of important components of connective tissue. However, these factors do not affect everyone to the same degree, and skin aging depends on a combination of genetic predisposition, age, environment, and lifestyle.
The study does not, however, investigate which of these factors specifically caused the observed changes. Rather, it provides a new perspective on how collagen damage can develop before it becomes visible on the skin’s surface. This is precisely where the significance of the findings lies: If such early changes can be reliably detected, it may be possible in the future to better investigate which stressors cause particularly severe damage to collagen and which measures help preserve its structure for as long as possible.
Early Detection Rather Than Waiting to Measure Visible Damage
The researchers hope that such methods will enable them to assess the health of connective tissue more accurately in the future. This could be of interest, for example, in research on skin aging, wound healing, or new dermatological treatments. The key insight here is this: If collagen is already losing its structural order before fibers visibly break down, this could be an early warning sign of incipient tissue damage.
This opens up a new perspective for skin research. Instead of merely examining how visibly aged or damaged the skin already is, researchers could in the future investigate more precisely when the first changes in the collagen network begin and which factors accelerate them. This would be particularly interesting for better distinguishing the effects of UV radiation, natural skin aging, or other stressors from one another.
In the long term, a better understanding of these early changes could also help in developing more targeted strategies to combat collagen breakdown. For example, it would be conceivable to test new active ingredients or skin treatments not only after clearly visible wrinkles or tissue damage have already developed, but also to investigate whether they can stabilize the collagen structure at an early stage. However, it is not yet clear whether such a change in collagen organization actually leads directly to visible skin damage or whether it is merely an early accompanying sign of the aging process.
The results thus make one thing particularly clear: skin aging may begin long before we notice it in the mirror. Visible signs such as wrinkles, sagging skin, or reduced elasticity could be merely the later result of a process that begins much earlier at the molecular level.