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LNK suppresses interferon signaling in melanoma

Ling-Wen Ding1, Qiao-Yang Sun2, Jarem J Edwards3,4

  • 1Cancer Science Institute of Singapore, National University of Singapore, Singapore, 117599, Singapore.

Nature Communications
|May 22, 2019
PubMed

Insights

Lymphoid Nuclear protein (LNK) is elevated in melanoma, promoting cancer cell growth. Silencing LNK enhances interferon

Area of Science:

  • Oncology
  • Molecular Biology
  • Immunology

Background:

  • LNK (SH2B3) is a known regulator of JAK-STAT signaling, primarily studied in blood cancers.
  • Its role in solid tumors like cutaneous melanoma is largely uncharacterized.

Purpose of the Study:

  • To investigate the function of LNK in cutaneous melanoma.
  • To elucidate the relationship between LNK, RAS-RAF-MEK signaling, and interferon (IFN) response in melanoma.

Main Methods:

  • Analysis of LNK expression in melanoma tissues.
  • Investigating the impact of LNK modulation (overexpression, shRNA, CRISPR-Cas9) on melanoma cell signaling pathways (JAK-STAT, RAS-RAF-MEK, IFN-STAT1).
  • Assessing the effects of LNK on cell growth, survival, cell cycle arrest, and apoptosis, particularly in response to IFN treatment.

Main Results:

  • LNK is significantly elevated in cutaneous melanoma.
  • Elevated LNK correlates with hyperactive RAS-RAF-MEK signaling and promotes melanoma cell growth and survival.
  • LNK negatively regulates IFN-STAT1 signaling, suppressing IFN-induced cell cycle arrest and apoptosis.
  • Silencing LNK potentiates the anti-melanoma effects of IFN.
  • Melanoma cells upregulate LNK in response to IFN, indicating a negative feedback loop.

Conclusions:

  • LNK plays a critical, previously unappreciated role in melanoma pathogenesis.
  • The IFN-STAT1-LNK signaling axis is a key regulator in melanoma.
  • LNK represents a potential therapeutic target for enhancing melanoma immunotherapy.

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