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Proceedings Paper

In-vivo NMR studies of deuterium-labeled photosensitizers in mice tumor model
Author(s): Subbaraya Ramaprasad; Y. H. Liu; R. K. Pandey; Fuu-Yau Shiau; Kevin M. Smith
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Paper Abstract

Photodynamic therapy (PDT) has emerged as a promising modality for the treatment of cancer. We are using newly synthesized and chemically defined and characterized porphyrin photosensitizers that are specifically labeled with deuterium to perform in vivo NMR studies in a murine tumor model. In vivo magnetic resonance offers the potential for repetitive, safe, noninvasive evaluation of photosensitizers, tumor metabolism, and the effect of PDT on the tumor metabolism. In an effort to monitor noninvasively the photosensitizers in an in vivo tumor model, we are synthesizing several deuterium labeled photosensitizers which absorb red light at or above 630 nm. Development of methods to test these photosensitizers directly in humans is not feasible at this time, since these photosensitizers are new and we do not yet understand the side effects. In addition, we do not understand the potential benefits compared with Photofrin II, the widely used photosensitizer. To perform our in vivo deuterium NMR studies on mouse foot tumors, we have constructed a solenoid coil which operates at 30.7 MHz for the deuterium nucleus. We have been able to detect the deuterium labeled photosensitizer in the tumor after a direct intra-tumor injection. The use of 31P NMR to predict the possible outcome of PDT in these tumors is also discussed.

Paper Details

Date Published: 18 June 1993
PDF: 9 pages
Proc. SPIE 1881, Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy II, (18 June 1993); doi: 10.1117/12.146327
Show Author Affiliations
Subbaraya Ramaprasad, Univ. of Arkansas for Medical Sciences (United States)
Y. H. Liu, Univ. of Arkansas/Little Rock (United States)
R. K. Pandey, Texas A&M Univ. (United States)
Fuu-Yau Shiau, Univ. of California/Davis (United States)
Kevin M. Smith, Univ. of California/Davis (United States)


Published in SPIE Proceedings Vol. 1881:
Optical Methods for Tumor Treatment and Detection: Mechanisms and Techniques in Photodynamic Therapy II
Thomas J. Dougherty, Editor(s)

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