Functional Selectivity in Cytokine Signaling Revealed Through a Pathogenic EPO Mutation


Creative Commons License

Kim A. R., Ulirsch J. C., WİLMES S., ÜNAL E., Moraga I., KARAKÜKCÜ M., ...Daha Fazla

CELL, cilt.168, sa.6, ss.1053-1079, 2017 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 168 Sayı: 6
  • Basım Tarihi: 2017
  • Doi Numarası: 10.1016/j.cell.2017.02.026
  • Dergi Adı: CELL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.1053-1079
  • Erciyes Üniversitesi Adresli: Evet

Özet

Cytokines are classically thought to stimulate downstream signaling pathways through monotonic activation of receptors. We describe a severe anemia resulting from a homozygous mutation (R150Q) in the cytokine erythropoietin (EPO). Surprisingly, the EPO R150Q mutant shows only a mild reduction in affinity for its receptor but has altered binding kinetics. The EPO mutant is less effective at stimulating erythroid cell proliferation and differentiation, even at maximally potent concentrations. While the EPO mutant can stimulate effectors such as STAT5 to a similar extent as the wild-type ligand, there is reduced JAK2-mediated phosphorylation of select downstream targets. This impairment in downstream signaling mechanistically arises from altered receptor dimerization dynamics due to extracellular binding changes. These results demonstrate how variation in a single cytokine can lead to biased downstream signaling and can thereby cause human disease. Moreover, we have defined a distinct treatable form of anemia through mutation identification and functional studies.