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Proceedings Paper

Photochemotherapy: Molecular And Cellular Processes Involved
Author(s): John D. Spikes
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Paper Abstract

In photochemotherapy, as exemplified by the photodynamic therapy of tumors, a photosensitizing drug is administered to the patient; then, after a period of time to permit the most effective anatomical distribution of the drug, the diseased area is illuminated using an appropriate source of light of wavelengths absorbed by the sensitizer. In the tumor case, this results in the photochemical alteration of critical kinds of biornolecules in the diseased tissue, which interferes with the normal activities of certain cell organelles. This, in turn, leads to the injury or death of diseased cells in the treated area. This paper briefly reviews the reactive chemical species that can be formed in biological systems by illuminated sensitizers (triplet states of sensitizer molecules, free radicals of sensitizers and cellular components, singlet oxygen, superoxide, hydrogen peroxide, hydroxyl radical) and the kinds of biochemical changes they produce in essential cellular molecules (nucleic acids, proteins, unsaturated lipids, etc.). Also reviewed are the effects of these molecular changes on the structure and function of mammalian cell organelles (membranes, mitochondria, nuclear components, etc.) and the mechanisms of the resulting injury or killing of the cells.

Paper Details

Date Published: 17 March 1989
PDF: 9 pages
Proc. SPIE 0997, Advances in Photochemotherapy, (17 March 1989); doi: 10.1117/12.960189
Show Author Affiliations
John D. Spikes, University of Utah (United States)

Published in SPIE Proceedings Vol. 0997:
Advances in Photochemotherapy
Tayyaba Hasan, Editor(s)

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