SummaryProgranulin (PGRN) is a pleiotropic growth factor with immunosuppressive properties. Recently, it was reported that PGRN was an antagonist of tumour necrosis factor (TNF) receptors, preferentially for TNFR2. However, we and others showed that TNF-TNFR2 interaction was critical for the activation and expansion of functional CD4 + Foxp3 + regulatory
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