HIC1 tumour suppressor gene is suppressed in acute myeloid leukaemia and induced during granulocytic differentiation

Britschgi, Christian; Jenal, Mathias; Rizzi, Mattia; Mueller, Beatrice U; Torbett, Bruce E; Andres, Anne-Catherine; Tobler, Andreas; Fey, Martin F; Tschan, Mario P (2008). HIC1 tumour suppressor gene is suppressed in acute myeloid leukaemia and induced during granulocytic differentiation. British journal of haematology, 141(2), pp. 179-87. Oxford: Wiley-Blackwell 10.1111/j.1365-2141.2008.06992.x

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A hallmark of acute myeloid leukaemia (AML) is a block in differentiation caused by deregulated gene expression. The tumour suppressor Hypermethylated In Cancer 1 (HIC1) is a transcriptional repressor, which is epigenetically silenced in solid cancers. HIC1 mRNA expression was found to be low in 128 patient samples of AML and CD34+ progenitor cells when compared with terminally differentiated granulocytes. HIC1 mRNA was induced in a patient with t(15;17)-positive acute promyelocytic leukaemia receiving all-trans retinoic acid (ATRA) therapy. We therefore investigated whether HIC1 plays a role in granulocytic differentiation and whether loss of function of this gene might contribute to the differentiation block in AML. We evaluated HIC1 mRNA levels in HL-60 and U-937 cells upon ATRA-induced differentiation and in CD34+ progenitor cells after granulocyte colony-stimulating factor-induced differentiation. In both models of granulocytic differentiation, we observed significant HIC1 induction. When HIC1 mRNA was suppressed in HL-60 cells using stably expressed short hairpin RNA targeting HIC1, granulocytic differentiation was altered as assessed by CD11b expression. Bisulphite sequencing of GC-rich regions (CpG islands) in the HIC1 promoter provided evidence that the observed suppression in HL-60 cells was not because of promoter hypermethylation. Our findings indicate a role for the tumour suppressor gene HIC1 in granulocytic differentiation. Low expression of HIC1 may very well contribute to pathogenic events in leukaemogenesis.

Item Type:	Journal Article (Original Article)
Division/Institute:	04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Medical Oncology 04 Faculty of Medicine > Department of General Internal Medicine (DAIM) > Clinic of General Internal Medicine > Centre of Competence for General Internal Medicine 04 Faculty of Medicine > Pre-clinic Human Medicine > BioMedical Research (DBMR) > DCR Unit Tiefenau Hospital [discontinued] > Forschungsgruppe Biologie und Karzinogenese der Brustdrüse [discontinued] 04 Faculty of Medicine > Department of Haematology, Oncology, Infectious Diseases, Laboratory Medicine and Hospital Pharmacy (DOLS) > Clinic of Haematology and Central Haematological Laboratory
UniBE Contributor:	Britschgi, Christian, Müller, Beatrice Ursula, Andres, Anne Catherine, Tobler, Andreas (B), Fey, Martin, Tschan, Mario Paul
ISSN:	0007-1048
ISBN:	18318772
Publisher:	Wiley-Blackwell
Language:	English
Submitter:	Factscience Import
Date Deposited:	04 Oct 2013 15:01
Last Modified:	29 Mar 2023 23:33
Publisher DOI:	10.1111/j.1365-2141.2008.06992.x
PubMed ID:	18318772
Web of Science ID:	000254189100004
URI:	https://boris.unibe.ch/id/eprint/26587 (FactScience: 73609)