A protein found on T cells (a type of immune cell) that helps keep the body’s immune responses in check. When CTLA-4 is bound to another protein called B7, it helps keep T cells from killing other cells, including cancer cells.

How does an anti CTLA-4 antibody promote cancer immunity?

Antibodies to human CTLA-4 have been shown to induce long-lasting protection against melanoma. It is assumed that these antibodies cause tumor rejection by blocking negative signaling from the B7-CTLA-4 interactions to enhance priming of naïve T cells in the lymphoid organs.

Is CTLA-4 a monoclonal antibody?

A recombinant human monoclonal antibody directed against the human T-cell receptor cytotoxic T-lymphocyte-associated antigen 4 (CTLA4), with immune checkpoint inhibitory and antineoplastic activities.

What is the rationale behind the use of anti CTLA-4 and anti PD 1 antibodies?

The rationale for combination therapies using anti-PD-1/PD-L1 and anti-CTLA-4 antibodies is that blockade of the PD-1/PD-L1 pathway does not induce antitumor immunity if antigen-specific CD8-positive T cells are not present in cancer tissues; however, blockade of the B7-CTLA-4 pathway leads to increased activation of …

What is CTLA-4 antibody?

Cytotoxic T lymphocyte-associated antigen (CTLA-4), also known as CD152, is a co-inhibitory molecule that functions to regulate T cell activation. Antibodies that block the interaction of CTLA-4 with its ligands B7. 1 and B7. 2 can enhance immune responses, including anti-tumor immunity.

What does CTLA-4 mean?

The cytotoxic T-lymphocyte–associated antigen 4 (CTLA-4) and programmed death 1 (PD-1) immune checkpoints are negative regulators of T-cell immune function.

What is anti CTLA-4 antibody?

Abstract. Cytotoxic T-lymphocyte-associated antigen (CTLA-4), also known as CD152, is a co-inhibitory molecule that functions to regulate T-cell activation. Antibodies that block the interaction of CTLA-4 with its ligands B7. 1 and B7. 2 can enhance immune responses, including antitumor immunity.

How does the CTA 4 antibody work?

CTLA-4, expressed exclusively on T-cells, acts as a negative co-stimulatory signal, inhibiting T-cell activation and proliferation to maintain self-tolerance and protect from autoimmunity [4].

What is anti CTLA4 MAB?

A Fc-modified monoclonal antibody directed against the human T-cell receptor cytotoxic T-lymphocyte-associated antigen 4 (CTLA4; CTLA-4), with potential immune checkpoint inhibitory and antineoplastic activities.

What does CTLA-4 stand for?

What is the role of CTLA-4?

CTLA4 or CTLA-4 (cytotoxic T-lymphocyte-associated protein 4), also known as CD152 (cluster of differentiation 152), is a protein receptor that functions as an immune checkpoint and downregulates immune responses.

How do anti-CTLA-4 antibodies block intratumoral T cells?

Anti-CTLA-4 antibodies of IgG2a isotype enhance antitumor activity through reduction of intratumoral regulatory T cells. Antitumor activity of CTLA-4 antibody blockade is thought to be mediated by interfering with the negative regulation of T-effector cell (Teff) function resulting from CTLA-4 engagement by B7-ligands.

Is anti-CTLA-4 antibody effective in colon cancer?

Anti-CTLA-4 antibody containing the murine immunoglobulin G (IgG)2a constant region exhibits enhanced antitumor activity in subcutaneous established MC38 and CT26 colon adenocarcinoma tumor models compared with anti-CTLA-4 containing the IgG2b constant region.

What is the role of CTLA-4 in antiantitumor activity?

Antitumor activity of CTLA-4 antibody blockade is thought to be mediated by interfering with the negative regulation of T-effector cell (Teff) function resulting from CTLA-4 engagement by B7-ligands. In addition, a role for CTLA-4 on regulatory T cells (Treg), wherein CTLA-4 loss or inhibition resul …

Are anti-CTLA-4 antibodies effective against Fcγ receptors?

Interestingly, anti-CTLA-4 antibodies containing mouse IgG1 or a mutated mouse IgG1-D265A, which eliminates binding to all Fcγ receptors (FcγR), do not show antitumor activity in these models.