Cited by 78Photodynamic Therapy Research StudiesPorphyrin Metabolism and DisordersPorphyrin and Phthalocyanine Chemistry

A regulatory role for porphobilinogen deaminase (PBGD) in δ-aminolaevulinic acid (δ-ALA)-induced photosensitization?

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Gibson, SL, Cupriks, DJ, Havens, JJ, Nguyen, ML, Hilf, R·1998·British Journal of Cancer

Abstract

As an initial approach to optimize delta-aminolaevulinic acid (delta-ALA)-induced photosensitization of tumours, we examined the response of three enzymes of the haem biosynthetic pathway: delta-ALA dehydratase, porphobilinogen deaminase (PBGD) and ferrochelatase. Only PBGD activity displayed a time- and dose-related increase in tumours after intravenous administration of 300 mg kg(-1) delta-ALA. The time course for porphyrin fluorescence changes, reflecting increased production of the penultimate porphyrin, protoporphyrin IX (PPIX), showed a similar pattern to PBGD. This apparent correlation between PBGD activity and porphyrin fluorescence was also observed in four cultured tumour cell lines exposed to 0.1-2.0 mM delta-ALA in vitro. The increase in PBGD activity and PPIX fluorescence was prevented by the protein synthesis inhibitor cycloheximide. As the apparent Km for PBGD was similar before and after delta-ALA, the increase in PBGD activity was attributed to induction of enzyme de novo. These observations of an associated response of PBGD and PPIX imply that PBGD may be a rate-limiting determinant for the efficacy of delta-ALA-induced photosensitization when used in photodynamic therapy.

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Crossref · 10.1038/bjc.1998.39

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  • Although the uptake of ALA is non-selective, accumulation of PpIX in tumor cells may occur selectively because of alterations in enzymatic activity in the heme synthesis pathway.

    “Although the uptake of ALA is non-selective, accumulation of PpIX in tumor cells may occur selectively because of alterations in enzymatic activity in the heme synthesis pathway.”

    From Photodynamic Therapy for Non-Melanoma Skin Cancers (2016) · cites this paper as [9]

  • The accumulation of PpIX in neoplastic tissue is further supplemented by decreased activity of ferrochelatase (FC), which converts PpIX to heme.

    “The accumulation of PpIX in neoplastic tissue is further supplemented by decreased activity of ferrochelatase (FC), which converts PpIX to heme [9,10].”

    From Photodynamic Therapy for Non-Melanoma Skin Cancers (2016) · cites this paper as [9]

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Authors
Gibson, S., Cupriks, D., Havens, J., Nguyen, M., & Hilf, R.
Affiliations
University of Rochester Medicine (US)
Venue
British Journal of Cancer
Published
1998-01
Volume
77
Issue
2
Pages
235-242
ISSN
  • 0007-0920 (ISSN-L)
  • 1532-1827
OpenAlex
W2026741498
Cited by
78
References
35
Citations by year
2024: 1 · 2023: 1 · 2022: 2 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 1 · 2016: 3 · 2015: 1 · 2013: 2 · 2012: 3
FWCI
6.69
Type
journal article
Language
en
Open access
Locations
  • British Journal of Cancer (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • University of Rochester
  • National Institutes of Health (5r01ca036856-16, 5p30ca011198-28)
  • National Cancer Institute (CA1 1198, CA 36856)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Photodynamic Therapy Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
  • Physical Sciences › Materials Science › Materials Chemistry › Porphyrin and Phthalocyanine Chemistry
Keywords
porphobilinogen deaminase, 5-aminolevulinic acid, photosensitization, photodynamic therapy, heme biosynthesis, protoporphyrin IX, porphyrin fluorescence, enzyme induction, cancer cell lines, cycloheximide, ferrochelatase
MeSH terms
Aminolevulinic Acid, Porphobilinogen Synthase, Animals, Cycloheximide, Female, Ferrochelatase, Humans, Mice, Nude, Photochemotherapy, Hydroxymethylbilane Synthase, Porphyrins, Spectrometry, Fluorescence, Tumor Cells, Cultured, Photosensitizing Agents, Mice, Rats

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