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Pathological roles of interleukin-15 in adult T-cell leukemia
1Department of Laboratory Medicine, Nagasaki University School of Medicine, Japan. y-yamada@net.nagasaki-u.ac.jp
Abstract:
Interleukin-15 (IL-15) is a 14-kDa glycoprotein belonging to the same four helix bundle-cytokine family as IL-2. Although the biological activity of IL-15 in vitro has been studied extensively, its physiological role is still obscure. The receptors for IL-15 and IL-2 consist of three subunits, an unique alpha chain and shared beta and gamma chains. Since beta and gamma chains transduce the signals from the receptors, both cytokines share similar biologic functions, although IL-15 and IL-2 do not have sequence homology. The alpha chains function to increase binding affinity for each cytokines. Adult T-cell leukemia (ATL) cells constitutively express the IL-2 receptor (IL-2R) alpha and expression is believed to be essential in the early stages of disease development. We have recently shown that ATL cells also express the complete form of IL-15R including the alpha chain, and that ATL cells proliferate in response to exogenous IL-15. Since the mRNA of IL-15 is ubiquitous and is detected in many tissues and cells, it is possible that IL-15R stimulation is involved in the development and progression of ATL. Here, we review recent studies on IL-15 and IL-15R and their association with ATL and other lymphoproliferative disorders.
Insights
Interleukin-15 (IL-15) and its receptor (IL-15R) are expressed on Adult T-cell leukemia cells, promoting their proliferation. This suggests IL-15R stimulation may play a role in the development and progression of ATL.
Area of Science:
- Immunology
- Molecular Biology
- Oncology
Background:
- Interleukin-15 (IL-15) is a cytokine structurally similar to IL-2, sharing receptor components (beta and gamma chains) but differing in alpha chains.
- While IL-15's in vitro activity is known, its physiological role remains unclear.
- Adult T-cell leukemia (ATL) cells express the IL-2 receptor alpha chain, crucial for early disease stages.
Purpose of the Study:
- To review recent studies on IL-15 and IL-15R.
- To explore the association between IL-15/IL-15R and ATL.
- To investigate the role of IL-15R stimulation in ATL development and progression.
Main Methods:
- Review of existing literature on IL-15, IL-15R, and ATL.
- Analysis of IL-15R expression on ATL cells.
- Assessment of ATL cell proliferation in response to IL-15.
Main Results:
- ATL cells express the complete IL-15 receptor (IL-15R), including the alpha chain.
- ATL cells proliferate in response to exogenous IL-15.
- Ubiquitous IL-15 mRNA suggests potential involvement in ATL development.
Conclusions:
- IL-15R stimulation may be implicated in the development and progression of ATL.
- IL-15 and IL-15R are potential targets for understanding and treating ATL.
- Further research is needed to elucidate the precise role of IL-15 in lymphoproliferative disorders.