New optical method reveals early collagen damage invisible in skin scans

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by Hiroshima University

edited by Sadie Harley, reviewed by Andrew Zinin

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Healthy collagen has a highly ordered microscopic "twist" (chirality) that gives rise to a strong optical signal. As collagen begins to age or deteriorate, this twist is gradually lost long before the fibers themselves start to break apart. Eventually, the collagen network becomes sparse and collapses. This work demonstrates that changes in collagen's molecular organization can reveal tissue deterioration earlier than conventional structural observations. Credit: Ali Haider / Hiroshima University

An international team led by researchers at Hiroshima University has developed a new way to detect subtle, early-stage changes in human skin collagen before any visible signs of damage appear. The study, published in ACS Nano, reveals that the molecular organization and supramolecular chirality—or structural handedness—of dermal collagen collapse before the visible fiber network actually thins or fragments.

Collagen is a hierarchical material that forms a highly organized network that supports skin's structure and mechanical strength. Traditional imaging methods can easily identify visible deterioration, such as fiber thinning or loss of connectivity. However, these structural failures represent late stages of tissue remodeling.

"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 Ali Haider, first author of the study and 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."

Tracking hidden collagen changes

To uncover these hidden patterns, the team integrated advanced optical imaging with chiroptical spectroscopy, including synchrotron radiation vacuum-ultraviolet circular dichroism (SR-VUVCD) and multidimensional quantum cascade laser vibrational circular dichroism (MultiD-QCL-VCD). This framework allowed them to map both the presence of collagen and its chiral structural coherence in the same physical tissue section.

Ali Haider, a graduate student at HU and WPI-SKCM2 and first author of the study, observes the skin structure using confocal microscopy to investigate collagen organization and extracellular matrix remodeling. Credit: Ali Haider / Hiroshima University

When structure breaks before mass

The results demonstrated a distinct decoupling between collagen mass and structural order: Tissue samples retained their bulk collagen content and coverage even after their underlying supramolecular chirality coherence had severely degraded.

"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 Katsuya Inoue, a professor at WPI-SKCM² and one of the study's corresponding authors.

"Our study shows that advanced correlative methods can reveal changes in this hidden organization that are not apparent from morphology alone."

A framework for earlier intervention

The researchers' goal is to establish a comprehensive framework that integrates molecular chirality, supramolecular organization and macroscopic tissue architecture. This could provide insights for medical interventions, wound healing and biomaterial design, allowing researchers to evaluate tissue integrity before irreversible macroscopic breakdown occurs.

Publication details

Correlative multimodal framework reveals supramolecular chirality loss preceding fibrillar rarefaction in dermal collagen, ACS Nano (2026). DOI: 10.1021/acsnano.6c06602

Journal information: ACS Nano

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Dermatology Provided by Hiroshima University Who's behind this story?

Sadie Harley

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Andrew Zinin

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