Quantitative immunofluorescence assay for cyclobutyldithymidine dimers in individual mammalian cells

S. A. Lesko, W. Li, G. Zheng, D. Callahan, D. S. Kaplan, W. R. Midden, Paul Timothy Strickland

Research output: Contribution to journalArticle

Abstract

An indirect immunofluorescence procedure was developed for the measurement of cyclobutyl dithymidine dimers in DNA of individual Syrian hamster embryo cells using a specific monoclonal antibody. A fluorescein-labeled secondary antibody and a fluorochrome which binds to DNA were used to measure the photoproduct and total DNA in the same nucleus. Fluorescence intensity was quantitated with a computer-assisted microfluorometric system which was calibrated with a uranyl oxide impregnated glass slide. Similar dose-response curves, i.e. normalized fluorescence intensity plotted as a function of dose of germicidal irradiation, were obtained with two different cell types. Normalized fluorescence intensity per nucleus was related to thymidine dimer content with a competitive enzyme-linked imnmunosorbent assay using DNA isolated from cells given doses of germicidal irradiation identical to those used in the immunofluorescence assay. Thymidine dimer levels produced by 10 J/m2 of germicidal irradiation (∼8×105/nucleus) and which allow for 15-30% cell survival can readily be detected. The specific monoclonal antibody was labeled with tritium and used in the immunofluorescence assay to relate the number of antibodies bound to the number of thynudine dimers per cell. The data revealed that ∼45% of the thymidine dimers in cells exposed to 100 J/m2 of germicidal irradiation and essentially all the T2 were being detected in the indirect immunofluorescence assay. This technique can provide a sensitive means for measuring various types of DNA damage in individual cells given that the appropriate probes are available. It can be especially useful for monitoring occupationally or environmentally exposed populations where usually only small samples of cells or tissues are available.

Original languageEnglish (US)
Pages (from-to)641-646
Number of pages6
JournalCarcinogenesis
Volume10
Issue number4
DOIs
StatePublished - Apr 1989

Fingerprint

Dimer
Dimers
Fluorescent Antibody Technique
Assays
DNA
Cells
Irradiation
Cell
Monoclonal antibodies
Fluorescence
Thymidine
Antibodies
Dosimetry
Nucleus
Indirect Fluorescent Antibody Technique
Monoclonal Antibody
Antibody
Tritium
Monoclonal Antibodies
Dose

ASJC Scopus subject areas

  • Statistics, Probability and Uncertainty
  • Applied Mathematics
  • Physiology (medical)
  • Physiology
  • Behavioral Neuroscience
  • Cancer Research

Cite this

Quantitative immunofluorescence assay for cyclobutyldithymidine dimers in individual mammalian cells. / Lesko, S. A.; Li, W.; Zheng, G.; Callahan, D.; Kaplan, D. S.; Midden, W. R.; Strickland, Paul Timothy.

In: Carcinogenesis, Vol. 10, No. 4, 04.1989, p. 641-646.

Research output: Contribution to journalArticle

Lesko, S. A. ; Li, W. ; Zheng, G. ; Callahan, D. ; Kaplan, D. S. ; Midden, W. R. ; Strickland, Paul Timothy. / Quantitative immunofluorescence assay for cyclobutyldithymidine dimers in individual mammalian cells. In: Carcinogenesis. 1989 ; Vol. 10, No. 4. pp. 641-646.
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abstract = "An indirect immunofluorescence procedure was developed for the measurement of cyclobutyl dithymidine dimers in DNA of individual Syrian hamster embryo cells using a specific monoclonal antibody. A fluorescein-labeled secondary antibody and a fluorochrome which binds to DNA were used to measure the photoproduct and total DNA in the same nucleus. Fluorescence intensity was quantitated with a computer-assisted microfluorometric system which was calibrated with a uranyl oxide impregnated glass slide. Similar dose-response curves, i.e. normalized fluorescence intensity plotted as a function of dose of germicidal irradiation, were obtained with two different cell types. Normalized fluorescence intensity per nucleus was related to thymidine dimer content with a competitive enzyme-linked imnmunosorbent assay using DNA isolated from cells given doses of germicidal irradiation identical to those used in the immunofluorescence assay. Thymidine dimer levels produced by 10 J/m2 of germicidal irradiation (∼8×105/nucleus) and which allow for 15-30{\%} cell survival can readily be detected. The specific monoclonal antibody was labeled with tritium and used in the immunofluorescence assay to relate the number of antibodies bound to the number of thynudine dimers per cell. The data revealed that ∼45{\%} of the thymidine dimers in cells exposed to 100 J/m2 of germicidal irradiation and essentially all the T2 were being detected in the indirect immunofluorescence assay. This technique can provide a sensitive means for measuring various types of DNA damage in individual cells given that the appropriate probes are available. It can be especially useful for monitoring occupationally or environmentally exposed populations where usually only small samples of cells or tissues are available.",
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