Activation of the JAK1-STAT5 pathway by binding of the Friend virus gp55 glycoprotein to the erythropoietin receptor.
Friend spleen focus forming-virus (F-SFFV) induces acute erythroleukemia in susceptible mice. Initiation of the erythroleukemia is due to binding of the env-related glycoprotein gp55 encoded by F-SFFV to the erythropoietin receptor (EPOR). The gp55/EPOR interaction induces prolonged and growth factor independent proliferation in a factor-dependent cell line. In erythropoietin (EPO) signaling, the JAK2/STAT5 pathway was shown to be activated downstream of the EPOR to transmit the signal to the cells. To determine members of the JAK family and the STAT transcription factor family involved in the gp55/EPOR signaling, we examined tyrosine phosphorylation of JAKs and STATs in F-SFFV-infected erythroid or erythroleukemic cells. JAK1 and STAT5 were constitutively tyrosine-phosphorylated but the DNA binding activity of STAT5 was not induced without EPO stimulation in erythroblastoid cells from spleens of F-SFFV-infected mice and erythroleukemia cell lines derived from gp55-transgenic mice. These results indicate that JAK1 is involved in the gp55/EPOR signaling but STAT5 is not playing an essential role in the growth of those erythroid cells.
Yamamura
Y
Y
Department of Retroviral Regulation, Tokyo Medical and Dental University, Tokyo, Japan.
Senda
H
H
Noda
M
M
Ikawa
Y
Y
D000818:Animals; D004268:DNA-Binding Proteins / Q000378:metabolism*; D004789:Enzyme Activation; D005622:Friend murine leukemia virus / Q000502:physiology*; D015752:Genes, env; D053613:Janus Kinase 1; D053614:Janus Kinase 2; D004915:Leukemia, Erythroblastic, Acute / Q000378:metabolism; D051379:Mice; D008811:Mice, Inbred DBA; D008894:Milk Proteins; D011485:Protein Binding; D011505:Protein-Tyrosine Kinases / Q000378:metabolism*; D011518:Proto-Oncogene Proteins; D017467:Receptors, Erythropoietin / Q000378:metabolism*; D050799:STAT5 Transcription Factor; D015398:Signal Transduction; D013154:Spleen; D013155:Spleen Focus-Forming Viruses / Q000502:physiology*; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors; D014759:Viral Envelope Proteins / Q000378:metabolism*
D004268:DNA-Binding Proteins; D008894:Milk Proteins; D011518:Proto-Oncogene Proteins; D017467:Receptors, Erythropoietin; D050799:STAT5 Transcription Factor; D015534:Trans-Activators; D014157:Transcription Factors; D014759:Viral Envelope Proteins; C078780:glycoprotein gp55, Friend spleen focus-forming virus; D011505:Protein-Tyrosine Kinases; C507905:Jak1 protein, mouse; C507926:Jak2 protein, mouse; D053613:Janus Kinase 1; D053614:Janus Kinase 2