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Arenavirus Induced CCL5 Expression Causes NK Cell-Mediated Melanoma Regression

Hilal Bhat1, Gregor Zaun2, Thamer A Hamdan1

  • 1Medical Faculty, Institute of Immunology, University Duisburg-Essen, Essen, Germany.

Frontiers in Immunology
|September 25, 2020
PubMed

Insights

Lymphocytic choriomeningitis virus (LCMV) immunotherapy activates immune cells in melanoma. This study found CCL5 and NK cells are crucial for virus-induced tumor regression in melanoma models.

Area of Science:

  • Immunology
  • Virology
  • Oncology

Background:

  • Immune activation in the tumor microenvironment is a key strategy for tumor regression.
  • Viruses like herpes simplex virus (HSV) and lymphocytic choriomeningitis virus (LCMV) can stimulate tumor-specific immune responses.
  • The reasons why certain tumors do not respond to virotherapy or immunotherapy are not fully understood.

Purpose of the Study:

  • To investigate the role of non-cytopathic LCMV in human melanoma models.
  • To identify mechanisms underlying tumor regression in response to virotherapy.
  • To explore the involvement of specific immune factors in melanoma treatment.

Main Methods:

  • Utilized different human melanoma cell lines and *in vivo* mouse models.
  • Administered non-cytopathic LCMV infection to induce immunotherapy.
  • Quantified CCL5 production and assessed NK cell recruitment and activity.

Main Results:

  • Melanoma cell lines produced high levels of CCL5 upon immunotherapy.
  • LCMV infection in Ma-Mel-86a tumors led to significant CCL5 production.
  • CCL5 promoted NK cell recruitment, resulting in rapid tumor regression; absence of NK cells or CCL5 abrogated this effect.

Conclusions:

  • CCL5 is identified as a critical mediator in virotherapy-induced melanoma regression.
  • NK cell-mediated cytotoxicity is a key mechanism driving tumor regression during LCMV virotherapy.
  • These findings highlight CCL5 and NK cells as important factors for successful melanoma virotherapy.
Keywords:
CCL5LCMVNK cellsarenavirusimmunotherapyinnate immunitymelanomavirotherapy

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