Related Experiment Video
Updated: Jul 16, 2026
Development of an Insert Co-culture System of Two Cellular Types in the Absence of Cell-Cell Contact
Published on: July 17, 2016
Interleukin-6 antisense oligonucleotides inhibit the growth of human myeloma cell lines
1Laboratory of Immunochemistry and Immunopathology, Institut National de la Santé et de la Recherche Médicale U 108, Hôpital Saint-Louis, Paris, France.
Abstract:
IL-6 has been shown to be a plasmacytoma growth factor in mice and is believed to play a key role in the development of human multiple myeloma. We investigated the IL-6 requirements for the growth of two human myeloma cell lines, U 266 and RPMI 8226. These cell lines secreted minute amounts of IL-6 (20 U/ml) and featured IL-6 mRNA. IL-6 receptors were detectable at the surface of malignant cells by immunofluorescence. Antibodies to IL-6 did not alter the proliferation of these myeloma cells. There was a dose-dependent decrease, however, in [3H]-thymidine uptake in the presence of IL-6 antisense (and not sense) oligodeoxynucleotides; in the presence of 20 microM IL-6 antisense, an 80 and 95% inhibition of the proliferation of U 266 and RPMI 8226 cells was observed, respectively. These results provide strong evidence for an IL-6 autocrine proliferation of myeloma cells which may occur via internal interaction between IL-6 and the IL-6 receptor.
Insights
Interleukin-6 (IL-6) drives myeloma cell growth. Antisense oligodeoxynucleotides targeting IL-6 significantly inhibited proliferation in human multiple myeloma cell lines, suggesting an autocrine pathway.
Area of Science:
- Oncology
- Molecular Biology
- Immunology
Background:
- Interleukin-6 (IL-6) is implicated as a key factor in human multiple myeloma development.
- IL-6 acts as a plasmacytoma growth factor in mice.
Purpose of the Study:
- To investigate the role of IL-6 in the proliferation of human multiple myeloma cell lines.
- To determine if IL-6 autocrine signaling is essential for myeloma cell growth.
Main Methods:
- Utilized two human myeloma cell lines (U 266 and RPMI 8226).
- Assessed IL-6 secretion, mRNA expression, and receptor presence.
- Investigated the effect of IL-6 antibodies and IL-6 antisense oligodeoxynucleotides on cell proliferation and [3H]-thymidine uptake.
Main Results:
- Myeloma cell lines secreted low levels of IL-6 and expressed IL-6 mRNA and receptors.
- Antibodies to IL-6 did not affect cell proliferation.
- IL-6 antisense oligodeoxynucleotides, but not sense oligodeoxynucleotides, demonstrated a dose-dependent inhibition of cell proliferation, with 80-95% inhibition observed.
Conclusions:
- Myeloma cell proliferation is dependent on IL-6.
- Evidence strongly supports an IL-6 autocrine proliferation mechanism in multiple myeloma.
- This autocrine signaling may involve internal interactions between IL-6 and its receptor.
