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Seeing Through the Surface: Non-invasive Characterization of Biomaterial–Tissue Interactions Using Photoacoustic Microscopy

  • Nondestructive Characterization of Biomaterials for Tissue Engineering and Drug Delivery
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Abstract

At the intersection of life sciences, materials science, engineering, and medicine, regenerative medicine stands out as a rapidly progressing field that aims at retaining, restoring, or augmenting tissue/organ functions to promote the human welfare. While the field has witnessed tremendous advancements over the past few decades, it still faces many challenges. For example, it has been difficult to visualize, monitor, and assess the functions of the engineered tissue/organ constructs, particularly when three-dimensional scaffolds are involved. Conventional approaches based on histology are invasive and therefore only convey end-point assays. The development of volumetric imaging techniques such as confocal and ultrasonic imaging has enabled direct observation of intact constructs without the need of sectioning. However, the capability of these techniques is often limited in terms of penetration depth and contrast. In comparison, the recently developed photoacoustic microscopy (PAM) has allowed us to address these issues by integrating optical and ultrasonic imaging to greatly reduce the effect of tissue scattering of photons with one-way ultrasound detection while retaining the high optical absorption contrast. PAM has been successfully applied to a number of studies, such as observation of cell distribution, monitoring of vascularization, and interrogation of biomaterial degradation. In this review article, we highlight recent progress in non-invasive and volumetric characterization of biomaterial–tissue interactions using PAM. We also discuss challenges ahead and envision future directions.

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Acknowledgment

This work was supported in part by startup funds from the Georgia Institute of Technology and NIH Grants DP1 OD000798 (NIH Director’s Pioneer Award) and R01 AR060820. The authors would like to thank Dr. Yu Wang and Dr. Li Li for their assistance in OR-PAM–FCM and OR-PAM–OCT imaging of melanoma cell-scaffold interactions.

Conflict of interest

L. V. Wang has a financial interest in Endra, Inc., and Microphotoacoustics, Inc., which, however, did not support this work; all other authors declare no conflict of interest.

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Authors and Affiliations

  1. Department of Medicine, Biomaterials Innovation Research Center, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, 02115, USA

    Yu Shrike Zhang

  2. Harvard-MIT Division of Health Sciences and Technology, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA

    Yu Shrike Zhang

  3. Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA

    Yu Shrike Zhang

  4. Department of Biomedical Engineering, Washington University in St. Louis, St. Louis, MO, 63130, USA

    Lihong V. Wang

  5. The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, 30332, USA

    Younan Xia

  6. School of Chemistry and Biochemistry, School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA

    Younan Xia

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  1. Yu Shrike Zhang
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Correspondence to Lihong V. Wang or Younan Xia.

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Associate Editor Rebecca Kuntz-Willits oversaw the review of this article.

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Zhang, Y.S., Wang, L.V. & Xia, Y. Seeing Through the Surface: Non-invasive Characterization of Biomaterial–Tissue Interactions Using Photoacoustic Microscopy. Ann Biomed Eng 44, 649–666 (2016). https://doi.org/10.1007/s10439-015-1485-2

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