Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells

W. E. Bolton, W. R. Mikulka, C. G. Healy, R. J. Schmittling, Norma S Kenyon

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

Flow cytometric bivariate analysis was used to investigate the expression of PCNA, p120 and p145 during the cell cycle of a mammalian cell line (CHO-K1). Initially, aliquots of cells in exponential and plateau (G0) phase were analyzed for proliferation associated antigen expression. Expression of PCNA and p145 during G0 was markedly depressed (<12% positive) while 54% of the G0 cells stained positive for p120. The fluorescent intensity (mean channel fluorescence) of these G0 positive p120 cells, however, was only slightly above the mean channel fluorescence (MCF) of cells stained with a negative isotype control. In asynchronous cultures, all three antigens were expressed in >70% of the cells, with PCNA staining being greater than 95%. Cells were then synchronized using mitotic selection (mitotic index of 97%) and antigen levels were measured as cells progressed synchronously through the cell cycle. From DNA analysis histograms, it appeared that the degree of synchrony was approximately 90% throughout the remainder of the cell cycle. The bivariate DNA/PCNA, DNA/p120, and DNA/p145 histograms for mitotic cells indicated that both p120 and p145 expression were elevated (percent positive and MCF) while PCNA levels were near controls (MCF). In early G1, all three markers were depressed (< 12% positive); however PCNA levels rose precipitously in mid-G1 (> 50% positive). In late G1 to early S, p145 levels increased concomitantly with increases in p120. All three antigens were elevated throughout S phase and began to decline as cells moved from G2/M to G1 of the next cell cycle with p145 expression decreasing first. This report indicates that all three proliferation associated antigens studied are differentially expressed in the cell cycle and therefore may be useful in detecting and assessing the proliferation state.

Original languageEnglish
Pages (from-to)117-126
Number of pages10
JournalCytometry
Volume13
Issue number2
StatePublished - Jan 1 1992
Externally publishedYes

Fingerprint

Cell Cycle
Antigens
Proliferating Cell Nuclear Antigen
DNA
Cell Cycle Resting Phase
Mitotic Index
S Phase
Staining and Labeling
Cell Line
proliferating cell nuclear antigen p145

Keywords

  • Cell cycle
  • Dual parameter DNA analysis
  • p120
  • p145
  • PCNA
  • Proliferation

ASJC Scopus subject areas

  • Biophysics
  • Cell Biology
  • Endocrinology
  • Hematology
  • Pathology and Forensic Medicine

Cite this

Bolton, W. E., Mikulka, W. R., Healy, C. G., Schmittling, R. J., & Kenyon, N. S. (1992). Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells. Cytometry, 13(2), 117-126.

Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells. / Bolton, W. E.; Mikulka, W. R.; Healy, C. G.; Schmittling, R. J.; Kenyon, Norma S.

In: Cytometry, Vol. 13, No. 2, 01.01.1992, p. 117-126.

Research output: Contribution to journalArticle

Bolton, WE, Mikulka, WR, Healy, CG, Schmittling, RJ & Kenyon, NS 1992, 'Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells', Cytometry, vol. 13, no. 2, pp. 117-126.
Bolton WE, Mikulka WR, Healy CG, Schmittling RJ, Kenyon NS. Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells. Cytometry. 1992 Jan 1;13(2):117-126.
Bolton, W. E. ; Mikulka, W. R. ; Healy, C. G. ; Schmittling, R. J. ; Kenyon, Norma S. / Expression of proliferation associated antigens in the cell cycle of synchronized mammalian cells. In: Cytometry. 1992 ; Vol. 13, No. 2. pp. 117-126.
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abstract = "Flow cytometric bivariate analysis was used to investigate the expression of PCNA, p120 and p145 during the cell cycle of a mammalian cell line (CHO-K1). Initially, aliquots of cells in exponential and plateau (G0) phase were analyzed for proliferation associated antigen expression. Expression of PCNA and p145 during G0 was markedly depressed (<12{\%} positive) while 54{\%} of the G0 cells stained positive for p120. The fluorescent intensity (mean channel fluorescence) of these G0 positive p120 cells, however, was only slightly above the mean channel fluorescence (MCF) of cells stained with a negative isotype control. In asynchronous cultures, all three antigens were expressed in >70{\%} of the cells, with PCNA staining being greater than 95{\%}. Cells were then synchronized using mitotic selection (mitotic index of 97{\%}) and antigen levels were measured as cells progressed synchronously through the cell cycle. From DNA analysis histograms, it appeared that the degree of synchrony was approximately 90{\%} throughout the remainder of the cell cycle. The bivariate DNA/PCNA, DNA/p120, and DNA/p145 histograms for mitotic cells indicated that both p120 and p145 expression were elevated (percent positive and MCF) while PCNA levels were near controls (MCF). In early G1, all three markers were depressed (< 12{\%} positive); however PCNA levels rose precipitously in mid-G1 (> 50{\%} positive). In late G1 to early S, p145 levels increased concomitantly with increases in p120. All three antigens were elevated throughout S phase and began to decline as cells moved from G2/M to G1 of the next cell cycle with p145 expression decreasing first. This report indicates that all three proliferation associated antigens studied are differentially expressed in the cell cycle and therefore may be useful in detecting and assessing the proliferation state.",
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