Abstract
Human carcinomas were shown to express mRNA and protein for IL-2R α, β and γ chains. Recently, human carcinomas were also shown to constitutively express protein and mRNA for IL-2 in vivo and in vitro. Here we report that the expression levels of cytoplasmic IL-2 as well as IL-2Rβ- and γ-chain in human carcinoma cells change during the cell cycle progression. Carcinoma cells synchronized in the G2/M phase of the cell cycle expressed significantly more intracytoplasmic IL-2 as well as IL-2Rβ and γ proteins than tumor cells in the G0/G1 phase. The level of mRNA for IL-2 was 5–10-fold higher in the M phase than in the G0/G1-phase, as shown by quantitative competitive RT–PCR. Expression of the cyclin-dependent kinase (CDK) inhibitor p27kip1 in these carcinoma cells was found to be high in the G0/G1 phase, nearly absent in the S phase, and it increased again in the G2/M phase of the cell cycle. In synchronized cells, the decrease in p27 expression coincided with high levels of expression of IL-2. Using the IL-2 specific antisense oligonucleotide to block synthesis of endogenous IL-2 in tumor cells, we observed increased levels of p27 as well as p21. The antisense oligonucleotides specific for p27 or p21 blocked expression of these proteins but not of IL-2. Thus, endogenous IL-2 is important in regulating expression of p27 as well as p21 and, therefore, in controlling cell cycle progression of tumor cells, while its own expression remains independent of the CDK inhibitors.
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Abbreviations
- ASO:
-
antisense oligonucleotide
- CDK:
-
cyclin-dependent kinase
- Con A:
-
Concanavalin A
- HR:
-
human gastric carcinoma
- IL-2:
-
Interleukin-2
- IL-2R:
-
Interleukin-2 receptor
- IP:
-
immunoperoxidase
- p27:
-
a CDK inhibitor, also called Kip1
- PBL:
-
peripheral blood lymphocytes
- PBMC:
-
peripheral blood mononuclear cells
- PHA:
-
phytohemagglutinin
- PI:
-
propidium iodide
- RT–PCR:
-
reverse-transcription polymerase chain reaction
- SCCHN:
-
squamous cell carcinoma of the head and neck
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Acknowledgements
This work was supported in part by R0-1 CA 63513 to TL Whiteside. TE Reichert was supported by the Deutsche Forschungsgemeinschaft (DFG), Grant Re 1155/1-1.
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Reichert, T., Nagashima, S., Kashii, Y. et al. Interleukin-2 expression in human carcinoma cell lines and its role in cell cycle progression. Oncogene 19, 514–525 (2000). https://doi.org/10.1038/sj.onc.1203391
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DOI: https://doi.org/10.1038/sj.onc.1203391
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