Fyn kinase is a novel modulator of erythropoietin signaling and stress erythropoiesis.
Fyn kinase is a novel modulator of erythropoietin signaling and stress erythropoiesis.
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DOI:
10.1002/ajh.25295
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发表时间:
2019-01
影响因子:
12.8
通讯作者:
De Franceschi L
中科院分区:
文献类型:
--
作者:
Beneduce E;Matte A;De Falco L;Mbiandjeu S;Chiabrando D;Tolosano E;Federti E;Petrillo S;Mohandas N;Siciliano A;Babu W;Menon V;Ghaffari S;Iolascon A;De Franceschi L
The signaling cascade induced by the interaction of erythropoietin (EPO) with its receptor (EPO-R) is a key event of erythropoiesis. We present here data indicating that Fyn, a Src-family-kinase, participates in the EPO signaling-pathway, since Fyn−/− mice exhibit reduced Tyr-phosphorylation of EPO-R and decreased STAT5-activity. The importance of Fyn in erythropoiesis is also supported by the blunted responsiveness of Fyn−/− mice to stress erythropoiesis. Fyn−/− mouse erythroblasts adapt to reactive oxygen species (ROS) by activating the redoxrelated-transcription-factor Nrf2. However, since Fyn is a physiologic repressor of Nrf2, absence of Fyn resulted in persistent-activation of Nrf2 and accumulation of nonfunctional proteins. ROS-induced over-activation of Jak2-Akt-mTOR-pathway and repression of autophagy with perturbation of lysosomal-clearance were also noted. Treatment with Rapamycin, a mTOR-inhibitor and autophagy activator, ameliorates Fyn−/− mouse baseline erythropoiesis and erythropoietic response to oxidative-stress. These findings identify a novel multimodal action of Fyn in the regulation of normal and stress erythropoiesis.
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