1 Ocak 2023 Dergi makalesi Açık Erişim

Bal, Sevgi Kostel; Giuliani, Sarah; Block, Jana; Repiscak, Peter; Hafemeister, Christoph; Shahin, Tala; Kasap, Nurhan; Ransmayr, Bernhard; Miao, Yirun; van de Wetering, Cheryl; Frohne, Alexandra; Heredia, Raul Jimenez; Schuster, Michael; Zoghi, Samaneh; Hertlein, Vanessa; Thian, Marini; Bykov, Aleksandr; Babayeva, Royala; Eltan, Sevgi Bilgic; Karakoc-Aydiner, Elif

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    <subfield code="a">Biallelic &lt;i&gt;NFATC1&lt;/i&gt; mutations cause an inborn error of immunity with impaired CD8&lt;SUP&gt;+&lt;/SUP&gt; T-cell function and perturbed glycolysis</subfield>
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    <subfield code="a">&lt;p&gt;The nuclear factor of activated T cells (NFAT) family of transcription factors plays central roles in adaptive immunity in murine models; however, their contribution to human immune homeostasis remains poorly defined. In a multigenerational pedigree, we identified 3 patients who carry germ line biallelic missense variants in NFATC1, presenting with recurrent infections, hypogammaglobulinemia, and decreased antibody responses. The compound heterozygous NFATC1 variants identified in these patients caused decreased stability and reduced the binding of DNA and interacting proteins. We observed defects in early activation and proliferation of T and B cells from these patients, amenable to rescue upon genetic reconstitution. Stimulation induced early T-cell activation and proliferation responses were delayed but not lost, reaching that of healthy controls at day 7, indicative of an adaptive capacity of the cells. Assessment of the metabolic capacity of patient T cells revealed that NFATc1 dysfunction rendered T cells unable to engage in glycolysis after stimulation, although oxidative metabolic processes were intact. We hypothesized that NFATc1-mutant T cells could compensate for the energy deficit due to defective glycolysis by using enhanced lipid metabolism as an adaptation, leading to a delayed, but not lost, activation responses. Indeed, we observed increased C-13-labeled palmitate incorporation into citrate, indicating higher fatty acid oxidation, and we demonstrated that metformin and rosiglitazone improved patient T-cell effector functions. Collectively, enabled by our molecular dissection of the consequences of loss-of-function NFATC1 mutations and extending the role of NFATc1 in human immunity beyond receptor signaling, we provide evidence of metabolic plasticity in the context of impaired glycolysis observed in patient T cells, alleviating delayed effector responses.&lt;/p&gt;</subfield>
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