PD-1 receptor expressed on stimulated

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Multiple Choice

PD-1 receptor expressed on stimulated

Explanation:
PD-1 is a checkpoint receptor that upregulates on T cells after they are activated. It acts to dampen T cell responses: when PD-1 on a stimulated T cell engages its ligands (PD-L1 or PD-L2), intracellular signals are dampened, reducing TCR signaling, proliferation, and cytokine production. This helps prevent overactivation and autoimmunity, and is a mechanism exploited in cancer therapy to reinvigorate exhausted T cells. While other cells can be part of the PD-1/ligand pathway, the receptor’s expression pattern most characteristic after stimulation is on T cells, making them the best answer.

PD-1 is a checkpoint receptor that upregulates on T cells after they are activated. It acts to dampen T cell responses: when PD-1 on a stimulated T cell engages its ligands (PD-L1 or PD-L2), intracellular signals are dampened, reducing TCR signaling, proliferation, and cytokine production. This helps prevent overactivation and autoimmunity, and is a mechanism exploited in cancer therapy to reinvigorate exhausted T cells. While other cells can be part of the PD-1/ligand pathway, the receptor’s expression pattern most characteristic after stimulation is on T cells, making them the best answer.

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