Sensing vascularization of ex-vivo produced oral mucosal equivalent (EVPOME) skin grafts in nude mice using optical spectroscopy

Karthik Vishwanath; Rajan Gurjar; Shiuhyang Kuo; Anthony Fasi; Roderick Kim; Suzannah Riccardi; Stephen E. Feinberg; David E. Wolf

doi:10.1117/12.2037085

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4 March 2014 Sensing vascularization of ex-vivo produced oral mucosal equivalent (EVPOME) skin grafts in nude mice using optical spectroscopy

Karthik Vishwanath, Rajan Gurjar, Shiuhyang Kuo, Anthony Fasi, Roderick Kim, Suzannah Riccardi, Stephen E. Feinberg, David E. Wolf

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Proceedings Volume 8926, Photonic Therapeutics and Diagnostics X; 89260I (2014) https://doi.org/10.1117/12.2037085
Event: SPIE BiOS, 2014, San Francisco, California, United States

Abstract

Repair of soft tissue defects of the lips as seen in complex maxillofacial injuries, requires pre-vascularized multi-tissue composite grafts. Protocols for fabrication of human ex-vivo produced oral mucosal equivalents (EVPOME) composed of epithelial cells and a dermal equivalent are available to create prelaminated flaps for grafting in patients. However, invivo assessment of neovascularization of the buried prelaminated flaps remains clinically challenging. Here, we use diffuse reflectance spectroscopy (DRS) and diffuse correlation spectroscopy (DCS) to non-invasively quantify longitudinal changes in the vessel density and blood-flow within EVPOME grafts implanted in the backs of SCID mice and subsequently to determine the utility of these optical techniques for assessing vascularization of implanted grafts. 20 animals were implanted with EVPOME grafts (1x1x0.05 cm³) in their backs. DRS and DCS measurements were obtained from each animal both atop the graft site and far away from the graft site, at one week post-implantation, each week, for four consecutive weeks. DRS spectra were analyzed using an inverse Monte Carlo model to extract tissue absorption and scattering coefficients, which were then used to extract blood flow information by fitting the experimental DCS traces. There were clear differences in the mean optical parameters (averaged across all mice) at the graft site vs. the off-site measurements. Both the total hemoglobin concentration (from DRS) and the relative blood flow (from DCS) peaked at week 3 at the graft site and declined to the off-site values by week 4. The optical parameters remained relatively constant throughout 4 weeks for the off-site measurements.

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Karthik Vishwanath, Rajan Gurjar, Shiuhyang Kuo, Anthony Fasi, Roderick Kim, Suzannah Riccardi, Stephen E. Feinberg, and David E. Wolf "Sensing vascularization of ex-vivo produced oral mucosal equivalent (EVPOME) skin grafts in nude mice using optical spectroscopy", Proc. SPIE 8926, Photonic Therapeutics and Diagnostics X, 89260I (4 March 2014); https://doi.org/10.1117/12.2037085

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