Take ADC for another example for which internalization is crucial because it allows the delivery of the cytotoxic drug into the cancer cell where it can exert its therapeutic effect Does ADCs internal

Yes, the internalization of ADCs (Antibody-Drug Conjugates) does require a high binding affinity between the antigen and antibody. ADCs are designed to specifically target cancer cells by utilizing an antibody that recognizes a specific antigen present on the cancer cell surface. The antibody component of the ADC binds to the antigen with high affinity, ensuring specific and selective targeting of the cancer cells.

Once the ADC binds to the cancer cell, it undergoes internalization through receptor-mediated endocytosis, a process where the cell engulfs the bound ADC into its interior. This internalization is crucial because it allows the ADC to be internalized within the cancer cell, where it can release the cytotoxic drug payload.

For effective internalization and subsequent release of the cytotoxic drug, a high binding affinity between the antigen and antibody is desired. A high binding affinity ensures strong and stable interaction between the ADC and the cancer cell, increasing the likelihood of efficient internalization. Additionally, a high binding affinity can also enhance the retention of the ADC within the cancer cell, increasing the exposure of the cancer cell to the cytotoxic drug and maximizing its therapeutic effect.

Therefore, in the context of ADCs, a high binding affinity between the antigen and antibody is crucial for efficient internalization and optimal delivery of the cytotoxic drug into the cancer cell.