Natural cytotoxicity triggering receptor 1 ligand (NCR1L) (NCR1L)

Natural cytotoxicity triggering receptor 1 (NCR1, also known as NKp46) ligands are a diverse set of molecules expressed on the surface of stressed, infected, or malignant cells that serve as critical triggers for Natural Killer (NK) cell-mediated immunity [1][2]. A primary component of these ligands is heparan sulfate (HS), specifically the HS side chains of cell-surface proteoglycans, which interact with the NKp46 receptor to initiate signaling [1]. Other identified ligands include viral hemagglutinins, calreticulin, and complement factor H-related protein 1 (CFHR1), allowing the immune system to recognize a variety of pathological states [3][4][5]. In the context of oncology, the interaction between NCR1 and its ligands on tumor cells is often impaired or downregulated as a mechanism of immune evasion [2]. Therapeutic strategies currently under development, such as NK cell engagers (NKCEs), aim to exploit this axis by using multi-specific antibodies that bind NCR1 on NK cells and a tumor-specific antigen, thereby mimicking the natural activation signal to drive potent anti-tumor responses [6][7]. These agents, including candidates like SAR443579, represent a novel class of immunotherapy designed to harness the innate immune system for the treatment of hematological and solid tumors [6].

Other names

NKp46 ligandNCR1-LHeparan sulfate (NCR1 ligand)Tumor-associated NCR1 ligandsViral hemagglutinin (NCR1 ligand)

NK cell engagement and activation via NCR1 (NKp46) binding to induce targeted tumor cell lysis [6][7].