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Intercellular adhesion molecule-1 on cultured human melanoma cells: influence of cytokines
1Department of Dermatology, Gifu University School of Medicine, Japan.
Insights
Cytokines like interferon-gamma (IFN-γ) increase intercellular adhesion molecule-1 (ICAM-1) on melanoma cells, enhancing lymphocyte adhesion. Blocking ICAM-1 or lymphocyte function-associated antigen-1 (LFA-1) inhibits this interaction, suggesting a key role in immune responses.
Area of Science:
- Immunology
- Cell Biology
- Dermatology
Background:
- Adhesion molecules, including intercellular adhesion molecule-1 (ICAM-1) and lymphocyte function-associated antigen-1 (LFA-1), are crucial for immune responses.
- Understanding melanoma cell interactions with lymphocytes is vital for cancer immunology.
Purpose of the Study:
- To investigate the effects of cytokines on cultured human melanoma cells (MMG2).
- To specifically examine the expression of ICAM-1 on MMG2 cells and subsequent lymphocyte adhesion.
Main Methods:
- Treatment of MMG2 cells with cytokines: Interferon-gamma (IFN-γ), Tumor Necrosis Factor-alpha (TNF-α), and Interleukin-1 beta (IL-1β).
- Assessment of ICAM-1 and HLA-DR expression on MMG2 cells using antibody-based methods.
- Measurement of lymphocyte adhesion to MMG2 cells.
- Inhibition studies using anti-ICAM-1 and anti-LFA-1 antibodies.
Main Results:
- IFN-γ significantly increased both ICAM-1 and HLA-DR expression on MMG2 cells, with ICAM-1 upregulation preceding HLA-DR.
- TNF-α and IL-1β also elevated ICAM-1 expression but did not affect HLA-DR.
- IFN-γ demonstrated a dose-dependent effect on lymphocyte adhesion to MMG2 cells.
- Blocking ICAM-1 on melanoma cells or LFA-1 on lymphocytes effectively inhibited lymphocyte adhesion.
Conclusions:
- Interferon-gamma induces ICAM-1 expression on melanoma cells, which facilitates lymphocyte adhesion.
- The interaction between ICAM-1 on melanoma cells and LFA-1 on lymphocytes plays a significant role in melanoma-lymphocyte interactions.
- These findings highlight a potential mechanism for immune cell targeting in melanoma therapy.
Abstract:
Adhesion molecules such as intercellular adhesion molecule-1 (ICAM-1) and its counter-receptor, lymphocyte function associated antigen-1 (LFA-1), play very important roles in immune responses. In this study, the effects of cytokines on cultured human melanoma cells (MMG2) were examined, especially focussing on the expression of ICAM-1 on MMG2 and lymphocyte adhesion to MMG2. Both the expression of ICAM-1 and HLA-DR on MMG2 increased after treatment with IFN-gamma. ICAM-1 expression began to increase earlier than HLA-DR expression. TNF-alpha and IL-1 beta also increased the expression of ICAM-1 on MMG2. However, these cytokines did not increase the expression of HLA-DR. IFN-gamma had a dose dependent effect on lymphocyte adhesion to MMG2. Pretreatment of IFN-gamma treated MMG2 with 84H10 (anti-ICAM-1 antibody) or pretreatment of lymphocytes with either SPV-L7 (anti-LFA-1 alpha antibody) or IOT10 (anti-LFA-1 beta antibody) inhibited the lymphocyte adhesion to MMG2. These results suggest that ICAM-1 molecules induced on melanoma cells by IFN-gamma can interact with LFA-1 molecules on lymphocytes.