One- and two-photon activated phototoxicity of conjugated porphyrin dimers with high two-photon absorption cross sections

Emma Dahlstedt, Hazel A. Collins, Milan Balaz, Marina K. Kuimova, Mamta Khurana, Brian C. Wilson, David Phillips, Harry L. Anderson

Research output: Contribution to journalArticle

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Abstract

Two-photon excited photodynamic therapy (PDT) has the potential to provide a highly targeted treatment for neoplastic diseases, as excitation can be pin-pointed to small volumes at the laser focus. In addition, two-photon PDT offers deeper penetration into mammalian tissue due to the longer wavelength of irradiation. Here we report the one-photon and two-photon excited PDT results for a collection of conjugated porphyrin dimers with high two-photon absorption cross sections. These dimers demonstrate high one-photon PDT efficacy against a human ovarian adenocarcinoma cell line (SK-OV-3) and exhibit no significant dark-toxicity at concentrations of up to 20 μM. Their one-photon excited PDT efficiencies, following irradiation at 657 nm, approach that of Visudyne ®, a drug used clinically for PDT. We investigated and optimised the effect of the photosensitiser concentration, incubation time and the light dose on the PDT efficacy of these dimers. These studies led to the selection of P2C2-NMeI as the most effective porphyrin dimer. We have demonstrated that P2C2-NMeI undergoes a two-photon activated process following excitation at 920 nm (3.6-6.8 mW, 300 fs, 90 MHz) and compared it to Visudyne. We conclude that the in vitro two-photon PDT efficacy of P2C2-NMeI is about twice that of Visudyne. This result highlights the potential of this series of porphyrin dimers for two-photon PDT.

Original languageEnglish
Pages (from-to)897-904
Number of pages8
JournalOrganic and Biomolecular Chemistry
Volume7
Issue number5
DOIs
Publication statusPublished - 2009 Feb 27

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Phototoxic Dermatitis
Porphyrins
Photodynamic therapy
Photochemotherapy
Photons
porphyrins
Dimers
absorption cross sections
therapy
dimers
photons
Irradiation
irradiation
Photosensitizing Agents
cultured cells
toxicity
Dosimetry
excitation
Toxicity
Adenocarcinoma

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Physical and Theoretical Chemistry
  • Organic Chemistry

Cite this

Dahlstedt, Emma ; Collins, Hazel A. ; Balaz, Milan ; Kuimova, Marina K. ; Khurana, Mamta ; Wilson, Brian C. ; Phillips, David ; Anderson, Harry L. / One- and two-photon activated phototoxicity of conjugated porphyrin dimers with high two-photon absorption cross sections. In: Organic and Biomolecular Chemistry. 2009 ; Vol. 7, No. 5. pp. 897-904.
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One- and two-photon activated phototoxicity of conjugated porphyrin dimers with high two-photon absorption cross sections. / Dahlstedt, Emma; Collins, Hazel A.; Balaz, Milan; Kuimova, Marina K.; Khurana, Mamta; Wilson, Brian C.; Phillips, David; Anderson, Harry L.

In: Organic and Biomolecular Chemistry, Vol. 7, No. 5, 27.02.2009, p. 897-904.

Research output: Contribution to journalArticle

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AU - Dahlstedt, Emma

AU - Collins, Hazel A.

AU - Balaz, Milan

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AU - Khurana, Mamta

AU - Wilson, Brian C.

AU - Phillips, David

AU - Anderson, Harry L.

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