Epigenetic inactivation of suppressors of cytokine signalling in Philadelphia-negative chronic myeloproliferative disorders.

Abstract:

:Ph-negative chronic myeloproliferative disorders (CMPD) are characterized by constitutive Janus kinase-signal transducer and activator of transcription (JAK-STAT) activation. SOCS3, SOCS1 and PTPN6 (SHP1) are negative regulators of the JAK-STAT pathway. We investigated epigenetic and genetic inactivation of SOCS3, SOCS1 and PTPN6 in 112 CMPD and 20 acute myeloid leukaemia (AML) post-CMPD. SOCS3 methylation occurred at high frequency in both CMPD (46/112; 41.1%) and AML post-CMPD (10/17; 58.8%) and was associated with transcriptional silencing. In contrast, methylation of SOCS1 and PTPN6 was observed in only a fraction of CMPD (15/112, 13.4% for SOCS1; and 8/112, 7.1% for PTPN6) and AML post-CMPD (3/20, 15% for SOCS1; and 1/20, 5% for PTPN6). No somatic mutations of SOCS1 were found in CMPD. SOCS3, SOCS1 and PTPN6 methylation occurred in both JAK2V617F-positive (35.1% for SOCS3; 14.9% for SOCS1; 8.1% for PTPN6) and JAK2V617F-negative (57.1% for SOCS3; 14.3% for SOCS1; and 9.5% for PTPN6) CMPD. These data indicate that methylation of SOCS3 and, to a lesser extent, SOCS1 and PTPN6 is a frequent event in both JAK2V617F-positive and -negative CMPD and may act as an alternative or complementary mechanism to JAK2 mutations, enhancing cytokine signal transduction. The frequent inactivation of SOCS3 is a novel finding in CMPD with potential implications for the molecular pathology of these disorders.

journal_name

Br J Haematol

authors

Capello D,Deambrogi C,Rossi D,Lischetti T,Piranda D,Cerri M,Spina V,Rasi S,Gaidano G,Lunghi M

doi

10.1111/j.1365-2141.2008.07072.x

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

504-11

issue

4

eissn

0007-1048

issn

1365-2141

pii

BJH7072

journal_volume

141

pub_type

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