JAK1 signaling promotes skin inflammation and is a major therapeutic target for atopic dermatitis-related itching. But in a study appearing in the Jan. 4, 2024, print issue of Cell after earlier publication online, researchers at the Icahn School of Medicine at Mount Sinai, led by dermatologist Brian Kim, found that intrinsic JAK1 signaling in sensory neurons had an immunoprotective effect in the lung. The findings suggest a more precise and personalized approach is required to potentially expand JAK inhibitor use to a wider range of allergy and inflammatory disorders.