Which of the following is not a JAK inhibitor?

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Multiple Choice

Which of the following is not a JAK inhibitor?

Explanation:
JAK inhibitors block intracellular kinases in the JAK-STAT signaling pathway, which is how many inflammatory cytokines exert their effects. The drugs listed—tofacitinib, baricitinib, and upadacitinib—are designed to inhibit different JAK enzymes (tofacitinib targets JAK1/3, baricitinib targets JAK1/2, and upadacitinib targets JAK1), dampening inflammatory signaling in conditions like psoriasis and atopic dermatitis. Cyclosporine, in contrast, is a calcineurin inhibitor. It binds cyclophilin and prevents calcineurin from activating the transcription factor NFAT, thereby reducing IL-2 production and T-cell activation. This mechanism is separate from the JAK-STAT pathway, so cyclosporine is not a JAK inhibitor.

JAK inhibitors block intracellular kinases in the JAK-STAT signaling pathway, which is how many inflammatory cytokines exert their effects. The drugs listed—tofacitinib, baricitinib, and upadacitinib—are designed to inhibit different JAK enzymes (tofacitinib targets JAK1/3, baricitinib targets JAK1/2, and upadacitinib targets JAK1), dampening inflammatory signaling in conditions like psoriasis and atopic dermatitis.

Cyclosporine, in contrast, is a calcineurin inhibitor. It binds cyclophilin and prevents calcineurin from activating the transcription factor NFAT, thereby reducing IL-2 production and T-cell activation. This mechanism is separate from the JAK-STAT pathway, so cyclosporine is not a JAK inhibitor.

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