Study finds collagen structural changes precede visible signs of skin aging

An international research team led by scientists at Hiroshima University has found that subtle structural changes in skin collagen occur well before any visible signs of aging or damage appear. The study, published in ACS Nano on July 16, 2026, demonstrates that the molecular organization and supramolecular chirality—or structural handedness—of dermal collagen collapses prior to the thinning or fragmentation of the visible fiber network (EurekAlert).

Collagen forms a hierarchical network that provides skin with mechanical strength and structure. Conventional imaging readily detects later-stage deterioration such as fiber thinning or loss of connectivity. However, these represent advanced stages of tissue remodeling, according to the researchers (Hiroshima University).

“One way to think about our findings is that conventional imaging methods can show the ‘bricks’ of a collagen structure, but they may miss subtle changes in how those bricks are arranged,” said first author Ali Haider, a graduate research fellow at Hiroshima University’s International Institute for Sustainability with Knotted Chiral Meta Matter (WPI-SKCM²). “It’s similar to detecting changes in the arrangement of words and sentences in a book before any pages appear damaged or missing,” as reported in the university release (Hiroshima University).

To detect these earlier changes, the team combined advanced optical imaging with chiroptical spectroscopy techniques, including synchrotron radiation vacuum-ultraviolet circular dichroism (SR-VUVCD) and multi-dimensional quantum cascade laser vibrational circular dichroism (MultiD-QCL-VCD). This correlative multimodal framework enabled mapping of both collagen presence and its chiral structural coherence within the same tissue section (ScienceDaily).

Analysis of human skin samples showed a clear decoupling between collagen mass and structural order. Samples retained bulk collagen content and coverage even after supramolecular chirality coherence had severely degraded. In essence, tissue could appear intact under standard morphology-based imaging while its internal hierarchical organization was already compromised (ACS Nano via EurekAlert).

“The key message of this paper is that collagen should not be viewed only as a visible fiber network but as a hierarchical material whose function depends on organization across multiple length scales,” said corresponding author Professor Katsuya Inoue of WPI-SKCM². “Our study shows that advanced correlative methods can reveal changes in this hidden organization that are not apparent from morphology alone” (News-Medical).

The researchers aim to develop a broader framework linking molecular chirality, supramolecular organization, and macroscopic tissue architecture. Such an approach could offer insights for medical interventions, wound healing assessment, and biomaterial design by enabling evaluation of tissue integrity before irreversible macroscopic breakdown (Earth.com).

The multidisciplinary collaboration included scientists from Hiroshima University (WPI-SKCM², Graduate School of Advanced Science and Engineering, Chirality Research Center, and Research Institute for Synchrotron Radiation Science), the Max Planck Institute for Intelligent Systems, Kyushu University, Kumamoto University, Ehime University, the Georgia Institute of Technology, and the University of Glasgow. Support came from WPI-SKCM², Institut Henri Poincaré, LabEx CARMIN, and the Alexander von Humboldt Foundation (ScienceDaily).

In comments to Newsweek, Haider noted that factors such as chronic ultraviolet exposure, glycation, low-grade inflammation, smoking, pollution, and mechanical stress can disrupt collagen organization, and general preventive measures include consistent broad-spectrum sunscreen use and avoiding smoking (Newsweek). An independent clinician not involved in the study described the work as highlighting the potential value of earlier preventive approaches, though it will not immediately alter clinical practice (Newsweek).

The full paper is titled “Correlative Multimodal Framework Reveals Supramolecular Chirality Loss Preceding Fibrillar Rarefaction in Dermal Collagen” (DOI: 10.1021/acsnano.6c06602).