Photoproduct formation from a zinc benzochlorin iminium salt detected by fluorescence microscopy.

Abstract

When examined by fluorescence microscopy, tumor cells loaded with a zinc benzochlorin iminium salt showed a very faint deep-red fluorescence that was rapidly transformed to a substantially brighter red-orange fluorescence. Fourier transfer spectroscopy analysis with a red-sensitive detection system revealed that an initial fluorescence at 770 nm was gradually converted to 640 nm fluorescence during excitation. Image analysis showed that photoproduct formation was accompanied by a change in the site of drug localization from the cytoplasm to the nucleus. These studies illustrate the power of interferometry for the characterization of photoproducts and changes in sensitizer localization during photoproduct formation.

• Authors: I Amit, Z Malik, D Kessel
• Journal: Photochemistry and photobiology (Photochem Photobiol) Vol. 69 Issue 6 Pg. 700-2 (Jun 1999) ISSN: 0031-8655 [Print] United States
• PMID: 10378009 (Publication Type: Journal Article, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Deuteroporphyrins
• Photosensitizing Agents
• zinc benzochlorin

Topics

• Animals
• Cell Nucleus (metabolism)
• Cytoplasm (metabolism)
• Deuteroporphyrins (pharmacokinetics, radiation effects)
• Mice
• Microscopy, Fluorescence
• Photochemistry
• Photochemotherapy
• Photosensitizing Agents (pharmacokinetics, radiation effects)
• Tumor Cells, Cultured