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Different nucleolar antigen expression in resting and proliferating human lymphocytes as studied by fluorescence
1University of Hamburg, Institute of Biophysics and Radiobiology, F.R.G.
Insights
Researchers developed a method using nucleolar antigen detection to distinguish between resting and proliferating human lymphocytes. This technique offers a new way to identify cell cycle status in immune cells.
Area of Science:
- Cell Biology
- Immunology
- Biochemistry
Background:
- Distinguishing between resting and proliferating cells is crucial in immunology and cell biology.
- Nucleolar morphology and antigen expression can change during cell proliferation.
Purpose of the Study:
- To investigate the utility of a specific nucleolar antigen (Si87) for discriminating between resting and proliferating human lymphocytes.
- To establish a reliable method for assessing lymphocyte proliferation status.
Main Methods:
- Obtained antinucleolar antibodies (Si87) from a scleroderma patient.
- Verified immunostaining specificity and monitored nucleolar morphological changes via fluorescence microscopy.
- Quantified DNA and nucleolar immunofluorescence using flow cytometry after phytohaemagglutinin stimulation.
Main Results:
- Phytohaemagglutinin stimulation led to a 3-fold increase in nucleoli number and size in lymphocytes.
- A corresponding 3-fold increase in mean total immunofluorescence per cell was observed.
- The nucleolar antigen content effectively differentiated between resting and proliferating lymphocytes.
Conclusions:
- The developed method, based on nucleolar antigen content, successfully discriminates between resting and proliferating human lymphocytes.
- This approach provides a valuable tool for studying lymphocyte activation and cell cycle dynamics.
Abstract:
The aim of this study was to investigate the use of a nucleolar antigen to discriminate between proliferating and resting cells. Antinucleolar antibodies (Si87) were obtained from a scleroderma patient. The specificity of immunostaining was verified and morphological changes in nucleoli were monitored using a fluorescence microscope. Fluorescence of propidium iodide-stained DNA and nucleolar immunofluorescence were measured by flow cytometry. Following phytohaemagglutinin stimulation the number of nucleoli of normal human peripheral blood lymphocytes increased about 3-fold, accompanied by enlargement of nucleolar size. Simultaneously a mean increase in total immunofluorescence per cell by a factor of three was detected. The method developed and applied here allows a discrimination between resting and proliferating human lymphocytes on the basis of their nucleolar antigen content.