Cited by 174Photodynamic Therapy Research StudiesCell death mechanisms and regulationPorphyrin Metabolism and Disorders

Apoptosis and necrosis induced with light and 5-aminolaevulinic acid-derived protoporphyrin IX

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Noodt, BB, Berg, K, Stokke, T, Peng, Q, Nesland, JM·1996·British Journal of Cancer

Abstract

The mode of cell death induced by photodynamic treatment (PDT) was studied in two cell lines cultured in monolayer, V79 Chinese hamster fibroblasts and WiDr human colon adenocarcinoma cells. The cells were incubated with 5-aminolaevulinic acid (5-ALA) as a precursor for the endogenously synthesised protoporphyrin IX, which was activated by light. Free DNA ends, owing to internucleosomal DNA cleavage in apoptotic cells, were stained specifically with a fluorescent dye in the terminal deoxynucleotidyl transferase (TdT) assay. The free DNA ends were measured by flow cytometry and the fractions of apoptotic cells determined. Total cell death was measured in a cell survival assay to determine the necrotic fraction after subtraction of the apoptotic fraction. V79 cells did undergo apoptosis while WiDr cells were killed only through necrosis. With time, the apoptotic fraction of V79 cells increased until a maximum was reached about 3-4 h after ALA-PDT treatment. For increasing ALA-PDT doses, a maximal apoptotic fraction 75-85% of the cells was measured at about 85% of total cell death. The flow cytometric assay of apoptosis was confirmed by the typical ladder of oligonucleosomal DNA fragments obtained from agarose gel electrophoresis, by fluorescence micrographs visualising the induced free DNA ends and by electron micrographs showing the typical morphology of apoptotic cells.

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Crossref · 10.1038/bjc.1996.310

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  • ALA-PDT promotes necrotic cell death dependent on the cell line, PpIX localization, and PDT dose.

    “ALA-PDT has been shown to promote necrotic cell death as well, which is highly dependent on the cell line, PpIX localization, and PDT dose.”

    From 5-Aminolevulinic Acid as a Theranostic Agent for Tumor Fluorescence Imaging and Photodynamic Therapy (2023) · cites this paper as [30]

    The paper reports that ALA-PDT killed WiDr cells by necrosis but V79 cells mainly by apoptosis, and its Discussion says higher light doses increased the necrotic fraction in V79 cells. The Discussion proposes photosensitiser localization as a possible explanation for differences in apoptotic response; it does not establish PpIX localization as a determinant of necrotic death. (LLM, conf=0.85)

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Authors
Noodt, B., Berg, K., Stokke, T., Peng, Q., & Nesland, J.
Affiliations
Cancer Registry of Norway (NO)
Venue
British Journal of Cancer
Published
1996-07
Volume
74
Issue
1
Pages
22-29
ISSN
  • 0007-0920 (ISSN-L)
  • 1532-1827
OpenAlex
W1976916629
Cited by
174
References
38
Citations by year
2026: 1 · 2025: 3 · 2024: 3 · 2023: 5 · 2022: 5 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 4 · 2017: 7 · 2016: 3 · 2015: 4 · 2014: 5 · 2013: 5 · 2012: 2
FWCI
6.46
Type
journal article
Language
en
Open access
Locations
  • British Journal of Cancer (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Photodynamic Therapy Research Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Porphyrin Metabolism and Disorders
Keywords
photodynamic therapy, 5-aminolevulinic acid, protoporphyrin IX, apoptosis, necrosis, cell death mode, V79 fibroblasts, DNA fragmentation, light activation
MeSH terms
Adenocarcinoma, Aminolevulinic Acid, Animals, Cells, Cultured, Colonic Neoplasms, Cricetulus, Fibroblasts, Cricetinae, Humans, Light, Necrosis, Photochemotherapy, Protoporphyrins, Tumor Cells, Cultured, Apoptosis, Photosensitizing Agents

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