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Updated: Oct 14, 2025
Imaging Denatured Collagen Strands In vivo and Ex vivo via Photo-triggered Hybridization of Caged Collagen Mimetic Peptides
Published on: January 31, 2014
Molecular Imaging of Collagen Destruction of the Spine
Lei Liu1,2, Kui Huang1, Wei Li3
1Guangdong Provincial Key Laboratory of Biomedical Imaging and Guangdong Provincial Engineering Research Center of Molecular Imaging, The Fifth Affiliated Hospital, Sun Yat-sen University, Zhuhai 519000, China.
Abstract:
As the leading cause of disability worldwide, low back pain is commonly caused by biomechanical and catabolic disruptions to key structures of the spine, such as intervertebral discs and facet joints. To date, accurate, noninvasive detection of microdestruction within these tissues remains an elusive goal. Here, we report an in vivo imaging approach based on a collagen hybridizing peptide (CHP) that specifically targets disruption to the extracellular matrix architecture at the molecular scale─the denatured collagen molecules. Utilizing fluorescently labeled CHPs, live animal imaging, and light sheet fluorescence microscopy, we mapped collagen destruction in the lumbar spines in 3D, revealing that under normal conditions collagen destruction was localized to load-bearing anatomical structures including annulus fibrosus of the disc and the facet joints, where aging, tensile force (hindlimb suspension), and disc degeneration (needle puncture) escalated the CHP-binding in specific mouse models. We showed that targeting denatured collagen molecules allowed for an accurate, quantifiable interrogation of the structural integrity of these spinal matrixes with a greater sensitivity than anatomical imaging and histology. Finally, we demonstrated CHP's binding to degenerated human discs, suggesting exciting potentials for applying CHP for diagnosing, monitoring, and treating various spinal disorders, including intervertebral disc degeneration, facet joint osteoarthritis, and ankylosing spondylitis.
Insights
A novel imaging technique uses collagen hybridizing peptides (CHPs) to detect molecular-scale damage in spinal tissues. This method accurately identifies early signs of low back pain, offering potential for diagnosing and monitoring spinal disorders.
Area of Science:
- Biomedical Imaging
- Molecular Biology
- Orthopedics
Background:
- Low back pain is a leading cause of disability, often stemming from spinal tissue damage.
- Current methods for detecting microdestruction in spinal structures are limited.
- Noninvasive molecular-scale imaging is needed for early diagnosis and monitoring.
Purpose of the Study:
- To develop and validate an in vivo imaging approach for detecting molecular-scale collagen disruption in spinal tissues.
- To assess the sensitivity and accuracy of this novel method compared to existing techniques.
- To explore the potential of this approach for diagnosing and monitoring spinal disorders.
Main Methods:
- Utilized fluorescently labeled collagen hybridizing peptides (CHPs) targeting denatured collagen.
- Employed live animal imaging and light sheet fluorescence microscopy for 3D mapping.
- Applied the technique to mouse models of aging, tensile force, and disc degeneration, and to human disc samples.
Main Results:
- CHP imaging accurately mapped collagen destruction in load-bearing spinal structures (annulus fibrosus, facet joints).
- Aging, tensile force, and disc degeneration significantly increased CHP binding in mouse models.
- The method demonstrated higher sensitivity than anatomical imaging and histology for assessing spinal structural integrity.
- CHP binding was observed in degenerated human discs.
Conclusions:
- Collagen hybridizing peptides provide a sensitive, noninvasive method for interrogating spinal matrix integrity at the molecular level.
- This imaging approach accurately quantifies collagen destruction associated with spinal degeneration.
- CHP imaging holds significant potential for diagnosing, monitoring, and potentially treating spinal disorders like disc degeneration and osteoarthritis.
