IL4Ra Controls The Medullary Dwell Time Of Mature Thymocytes By Scheduling Their Release From The Thymus
Following their generation, newly produced single positive (SP) thymocytes must remain in the thymus to undergo post-selection maturation, a process supported by the thymic medulla. This ensures that SP thymocytes are equipped with functional competence prior to S1PR1-mediated thymic emigration. Despite this importance, the intrathymic mechanisms that control the balance between retention and…
Upon their formation, single positive (SP) thymocytes must spend time in the thymic medulla to mature, a process reliant on the thymus. This retention period is essential for ensuring the thymocytes possess the necessary functionality before being released. However, the specific mechanisms controlling the balance between keeping SP thymocytes within the thymus and permitting their exit remains unknown.
In this report, we elucidate the cell autonomous role of IL4Ra-signalling in SP thymocytes, which governs the time they spend in the medulla. Our findings indicate that SP thymocytes' extended stay in the medulla, absent of IL4R expression, results from compromised interactions with the thymic medullary epithelial cells (mTEC). Notably, the prolongation of medullary occupancy positively impacts the maturity and functionality of SP thymocytes.
Enhanced TNF and IL2 production are observed, indicating the importance of IL4Ra in regulating the thymocytes' functional properties once released into the thymus.
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