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Microfluorometric study of nuclear DNA in normal human epidermis
1Department of Dermatology, Kurume University School of Medicine, Japan.
Acta Histochemica
|January 1, 1996
Summary
Nuclear DNA undergoes quantitative and qualitative changes during human epidermal keratinocyte terminal differentiation. These DNA alterations are linked to cellular changes observed in granular layer cells.
Area of Science:
- Cell Biology
- Molecular Biology
- Dermatology
Background:
- Human epidermal keratinocytes undergo terminal differentiation to form a protective barrier.
- Understanding nuclear DNA changes during this process is crucial for skin biology.
Purpose of the Study:
- To investigate quantitative and qualitative alterations in nuclear DNA during human epidermal terminal differentiation.
- To correlate DNA changes with specific cell populations in the epidermis.
Main Methods:
- Microfluorometry was used to analyze nuclear DNA.
- Human epidermis was fractionated using EDTA-trypsin and Percoll density gradient.
- DNA staining was performed using Feulgen reaction, Acridine Orange, and 4'-6-diamidino-2-phenylindole (DAPI).
Main Results:
- Lower density cells (granular layer) showed distinct DNA profiles with Acridine Orange and DAPI compared to Feulgen staining.
- Thermal denaturation revealed a higher double-stranded DNA to single-stranded DNA ratio in lower density cells.
- These findings indicate significant DNA modifications during keratinocyte differentiation.
Conclusions:
- Terminal differentiation of human epidermal keratinocytes involves significant quantitative and qualitative changes in nuclear DNA.
- These DNA alterations are measurable and correlate with the differentiation stage of keratinocytes.