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Yale Medical School

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Nature Aging, Feb 19 2025, | https://doi.org/10.1038/s43587-025-00813-5 Enhanced paracrine action of FGF21 in stromal cells delays thymic aging

Yun-Hee Youm ^1,2, Christy Gliniak ³, Yuan Zhang ⁴, Tamara Dlugos ¹, Philipp E. Scherer ³ & Vishwa Deep Dixit ^1,2,4,5,*

¹Department of Pathology, Yale School of Medicine, New Haven, CT, USA.
²Department of Immunobiology and Comparative Medicine, Yale School of Medicine, New Haven, CT, USA.
³Touchstone Diabetes Center, University of Texas Southwestern Medical Center, Dallas, TX, USA.
⁴Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
⁵Yale Center for Research on Aging, New Haven, CT, USA.

^*Corresponding author: correspondence to Vishwa Deep Dixit

Abstract

Age-related thymic involution precedes aging of all other organs in vertebrates and initiates the process of declining T cell diversity, which leads to eventual immune dysfunction. Whether FGF21, a liver-derived pro-longevity hormone that is also produced in thymic stroma, including by adipocytes, controls the mechanism of thymic demise is incompletely understood. Here, we demonstrate that elevation of FGF21 in thymic epithelial cells (TECs) and in adipocytes protects against thymic aging, whereas conditional hepatic overexpression did not impact thymic biology in aged mice. Notably, elevation of thymic FGF21 increased naïve CD8 T cells in aged animals and extended healthspan. Mechanistically, thymic FGF21 overexpression elevated TECs and reduced fibroadipogenic cells. Ablation of β-klotho, the obligatory co-receptor for FGF21 in Foxn1⁺ TECs, accelerated thymic aging, suggesting regulation of TECs by FGF21 is partially required for thymic lymphopoiesis. These findings establish that paracrine FGF21 improves thymic function and delays immune aging.

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형식Research article
게재일2025년 02월 (BRIC 등록일 2025-02-27)
연구진국외 연구진
분야 생명과학 > 면역학

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