The suppressor of cytokine signalling-1 (SOCS-1) gene is overexpressed in Philadelphia chromosome negative chronic myeloproliferative disorders.
The suppressor of cytokine signalling-1 (SOCS-1) is a negative regulator of signal transduction mediated by cytoplasmic tyrosine kinases such as the Janus kinases (JAKs). We investigated SOCS-1 expression in bone marrow cells from Philadelphia chromosome negative chronic myeloproliferative disorders (Ph(-) CMPD) and normal haematopoiesis (n=121), and additionally in peripheral blood samples (n=18). Except for chronic idiopathic myelofibrosis harbouring wild-type JAK2, other Ph(-) CMPD expressed significantly higher SOCS-1 levels of up to 14-fold compared to the control group (p<0.001) independent of the JAK2 status. The mononuclear cell fraction but not granulocytes in patients with Polycythaemia vera also significantly overexpressed SOCS-1. We conclude that up-regulation of the SOCS-1 gene might reflect a compensatory feedback mechanism with different emphasis among Ph(-) CMPD subtypes independent of an underlying JAK2 (V617F) mutation.
Bock
Oliver
O
Institute of Pathology, Hannover Medical School, 30625 Hannover, Germany. Bock.Oliver@MH-Hannover.de
Hussein
Kais
K
Brakensiek
Kai
K
Buhr
Thomas
T
Schlué
Jerome
J
Wiese
Birgitt
B
Kreipe
Hans
H
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001854:Bone Marrow Cells / Q000378:metabolism; D002908:Chronic Disease; D005260:Female; D005786:Gene Expression Regulation; D006410:Hematopoiesis / Q000235:genetics; D006801:Humans; D053614:Janus Kinase 2 / Q000235:genetics / Q000378:metabolism; D007963:Leukocytes, Mononuclear / Q000378:metabolism; D008297:Male; D008875:Middle Aged; D020125:Mutation, Missense; D009196:Myeloproliferative Disorders / Q000235:genetics / Q000378:metabolism*; D010677:Philadelphia Chromosome; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins / Q000096:biosynthesis* / Q000235:genetics
C108944:SOCS1 protein, human; D000071222:Suppressor of Cytokine Signaling 1 Protein; D050826:Suppressor of Cytokine Signaling Proteins; C507924:JAK2 protein, human; D053614:Janus Kinase 2