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NaCl-aided Hoechst 33258 staining method for DNA quantification and its application
A Yamamoto1, T Araki, K Fujimori
1Department of Anatomy, University of Tokushima, Japan.
Histochemistry
|January 1, 1989
Summary
Adding salt (NaCl) to Hoechst 33258 (Hoe) staining enhances DNA accessibility in cell nuclei. This improved fluorescence staining method accurately quantifies DNA amounts in various cell types, including spermatozoa and hepatocytes.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Accurate quantification of DNA content in cell nuclei is crucial for various biological studies.
- Standard fluorescence staining methods using Hoechst 33258 (Hoe) can be affected by DNA accessibility within the nucleus.
- Differences in chromatin structure can lead to variations in fluorescence intensity, complicating DNA quantification.
Purpose of the Study:
- To investigate the effect of salt (NaCl) concentration on the fluorescence staining of DNA in cell nuclei.
- To develop an improved fluorescence staining method for accurate in situ DNA quantification.
- To evaluate the applicability of the NaCl-aided staining method across different cell types.
Main Methods:
- DNA was stained with Hoechst 33258 (Hoe) in the presence of varying NaCl concentrations.
- Fluorescence intensity of DNA-Hoe complexes was measured.
- Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze histone dissociation.
- The NaCl-aided staining method was tested on spermatozoa, hepatocytes, cultivated human gingival cells, and rat hepatocytes.
Main Results:
- NaCl addition increased the fluorescence intensity of the nuclei-Hoe complex by up to 4-fold without affecting free DNA-Hoe solution.
- Histones H1, H2A, and H2B dissociated from cell nuclei at 1 M NaCl, increasing DNA accessibility to Hoe.
- The NaCl-aided method corrected for differences in DNA accessibility, providing accurate DNA quantification in spermatozoa versus hepatocytes.
- Reasonable proportionality between fluorescence intensity and DNA amount was observed in all tested cell types.
Conclusions:
- The addition of NaCl significantly enhances the fluorescence staining of DNA in cell nuclei by improving dye accessibility.
- The NaCl-aided Hoechst 33258 staining method provides a more accurate and reliable approach for quantifying DNA content in situ.
- This method is broadly applicable to various cell types and overcomes limitations of conventional staining techniques.