Original Article

Journal of Investigative Dermatology (1981) 77, 45–50; doi:10.1111/1523-1747.ep12479235

New Concepts in Therapeutic Photomedicine; Photochemistry, Optical Targeting and the Therapeutic Window

John A Parrish

Department of Dermatology, Harvard Medical School, Massachusetts General Hospital, Boston, Massachusetts, U.S.A.

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Abstract

Advances in optics technology, synthetic photochemistry, and the science of photobiology make it possible to think beyond phototherapy and photochemotherapy which is dependent on direct photochemical alteration of metabolites or direct phototoxic insult to cells. This report discusses another gender of photomedicine therapy which includes in vivo photoactivation of medicines, photon-dependent drug delivery, and manipulation of host and exposure source to maximize therapeutic index. These therapeutic manipulations are made possible because the skin is highly overperfused and because non-ionizing electromagnetic radiation that enters skin and blood has adequate photon energy to cause electronic excitation. Radiation of 320–800 nm is not very directly phototoxic, is absorbed by a variety of relatively nontoxic photolabile molecules and has an internal dosimetric depth profile. This radiation can therefore be used to activate, deactivate, bind, release or biotransform medications in vivo in skin or other organs. The photochemist, synthetic chemist and photobiologist can collaborate to significantly increase therapeutic possibilities.

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