Polyfunctional response by ImmTAC (IMCgp100) redirected CD8+ and CD4+ T cells

Immunology. 2017 Nov;152(3):425-438. doi: 10.1111/imm.12779. Epub 2017 Aug 2.


The success of immune system-based cancer therapies depends on a broad immune response engaging a range of effector cells and mechanisms. Immune mobilizing monoclonal T cell receptors (TCRs) against cancer (ImmTAC™ molecules: fusion proteins consisting of a soluble, affinity enhanced TCR and an anti-CD3 scFv antibody) were previously shown to redirect CD8+ and CD4+ T cells against tumours. Here we present evidence that IMCgp100 (ImmTAC recognizing a peptide derived from the melanoma-specific protein, gp100, presented by HLA-A*0201) efficiently redirects and activates effector and memory cells from both CD8+ and CD4+ repertoires. Using isolated subpopulations of T cells, we find that both terminally differentiated and effector memory CD8+ T cells redirected by IMCgp100 are potent killers of melanoma cells. Furthermore, CD4+ effector memory T cells elicit potent cytotoxic activity leading to melanoma cell killing upon redirection by IMCgp100. The majority of T cell subsets belonging to both the CD8+ and CD4+ repertoires secrete key pro-inflammatory cytokines (tumour necrosis factor-α, interferon-γ, interleukin-6) and chemokines (macrophage inflammatory protein-1α-β, interferon-γ-inducible protein-10, monocyte chemoattractant protein-1). At an individual cell level, IMCgp100-redirected T cells display a polyfunctional phenotype, which is a hallmark of a potent anti-cancer response. This study demonstrates that IMCgp100 induces broad immune responses that extend beyond the induction of CD8+ T cell-mediated cytotoxicity. These findings are of particular importance because IMCgp100 is currently undergoing clinical trials as a single agent or in combination with check point inhibitors for patients with malignant melanoma.

Keywords: ImmTAC; T cell receptor; T cells; cancer; immunotherapy; melanoma.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Apoptosis / drug effects
  • CD4-Positive T-Lymphocytes / drug effects*
  • CD4-Positive T-Lymphocytes / immunology
  • CD4-Positive T-Lymphocytes / metabolism
  • CD8-Positive T-Lymphocytes / drug effects*
  • CD8-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / metabolism
  • Cell Line, Tumor
  • Coculture Techniques
  • Cytokines / immunology
  • Cytokines / metabolism
  • Cytotoxicity, Immunologic / drug effects
  • Dose-Response Relationship, Drug
  • HLA-A2 Antigen / immunology
  • HLA-A2 Antigen / metabolism
  • Humans
  • Immunologic Memory / drug effects
  • Melanoma / immunology
  • Melanoma / metabolism
  • Melanoma / pathology
  • Melanoma / therapy*
  • Phenotype
  • Proteins / pharmacology*
  • Single-Chain Antibodies / pharmacology*
  • Skin Neoplasms / immunology
  • Skin Neoplasms / metabolism
  • Skin Neoplasms / pathology
  • Skin Neoplasms / therapy*
  • T-Lymphocytes, Regulatory / drug effects
  • T-Lymphocytes, Regulatory / immunology
  • T-Lymphocytes, Regulatory / metabolism
  • Time Factors
  • gp100 Melanoma Antigen / immunology*
  • gp100 Melanoma Antigen / metabolism


  • Cytokines
  • HLA-A*02:01 antigen
  • HLA-A2 Antigen
  • ImmTAC molecule, human
  • Proteins
  • Single-Chain Antibodies
  • gp100 Melanoma Antigen