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Published on: July 8, 2020
IL-32α has differential effects on proliferation and apoptosis of human melanoma cell lines
Michael B Nicholl1,2, Xuhui Chen1,3, Chenglu Qin1,3
1Ellis Fischel Cancer Center, University of Missouri School of Medicine, Columbia, Missouri.
Background:
Interleukin-32 (IL-32) is a recently recognized intracellular, proinflammatory cytokine which may play a role in cancer metastasis and patient survival. The role of IL-32 in cancer, especially its direct effect on cancer cells, is not well understood.
Material And Methods:
Clonogenic assay, PCNA staining, Quick Cell Proliferation assay, TUNEL staining, and caspase-3 activity assay were used to investigate the in vitro role for IL-32α in human melanoma growth. We further investigated the possible molecular mechanisms using RT-PCR and immunohistochemical staining.
Results:
Exogenous administration of IL-32α inhibited proliferation of the HTB-72 human melanoma cell line, but had little effect on other melanoma cell lines. Inhibition of proliferation in HTB-72 correlated with increased expression of p21 and p53. IL-32α administration also increased apoptosis in HTB-72. This finding correlated with increased expression of TRAILR1.
Conclusions:
The data presented suggest a direct effect of IL-32α on the growth of human melanoma and give some insight into the mechanisms which may in part govern this effect. J. Surg. Oncol. 2016;113:364-369. © 2016 Wiley Periodicals, Inc.
Insights
Interleukin-32 alpha (IL-32α) directly inhibited human melanoma cell growth and promoted apoptosis in vitro. This study sheds light on IL-32α’s role in melanoma, suggesting potential therapeutic implications.
Area of Science:
- Oncology
- Immunology
- Molecular Biology
Background:
- Interleukin-32 (IL-32) is an intracellular, proinflammatory cytokine implicated in cancer metastasis and survival.
- The specific role of IL-32 in cancer, particularly its direct impact on cancer cells, remains largely uncharacterized.
Purpose of the Study:
- To investigate the in vitro effects of IL-32α on human melanoma cell growth.
- To elucidate the molecular mechanisms underlying IL-32α's influence on melanoma progression.
Main Methods:
- Utilized clonogenic assays, PCNA staining, proliferation assays, TUNEL staining, and caspase-3 activity assays.
- Employed RT-PCR and immunohistochemical staining to explore molecular mechanisms.
Main Results:
- Exogenous IL-32α administration suppressed proliferation in the HTB-72 human melanoma cell line.
- Inhibition of proliferation correlated with increased p21 and p53 expression.
- IL-32α treatment enhanced apoptosis in HTB-72 cells, associated with increased TRAILR1 expression.
Conclusions:
- IL-32α demonstrates a direct inhibitory effect on human melanoma growth.
- Findings provide insights into the mechanisms by which IL-32α influences melanoma, including p53/p21 and TRAILR1 pathways.
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