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Blood, 15 December 2008, Vol. 112, No. 13, pp. 5130-5140. Prepublished online as a Blood First Edition Paper on September 17, 2008; DOI 10.1182/blood-2007-12-128744. This Article Full Text Full Text (PDF) All Versions of this Article: blood-2007-12-128744v1 112/13/5130    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Heuzé, M. L. Articles by Lutz, P. G. Search for Related Content PubMed PubMed Citation Articles by Heuzé, M. L. Articles by Lutz, P. G. Related Collections Neoplasia Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  NEOPLASIA ASB2 targets filamins A and B to proteasomal degradation Mélina L. Heuzé1,2,*, Isabelle Lamsoul1,2,*, Massimiliano Baldassarre3, Yatish Lad3, Sophie Lévêque1,2, Ziba Razinia4, Christel Moog-Lutz1,2,5, David A. Calderwood3, and Pierre G. Lutz1,2 1 Université de Toulouse, Université Paul Sabatier, Toulouse, France; 2 Centre National de la Recherche Scientifique, Institut de Pharmacologie et de Biologie Structurale, Toulouse, France; 3 Department of Pharmacology and Interdepartmental Program in Vascular Biology and Transplantation, and 4 Department of Cell Biology, School of Medicine, Yale University, New Haven, CT; and 5 Université Pierre et Marie Curie, Paris, France The ordered series of proliferation and differentiation from hematopoietic progenitor cells is disrupted in leukemia, resulting in arrest of differentiation at immature proliferative stages. Characterizing the molecular basis of hematopoietic differentiation is therefore important for understanding and treating disease. Retinoic acid induces expression of ankyrin repeat-containing protein with a suppressor of cytokine signaling box 2 (ASB2) in acute promyelocytic leukemia cells, and ASB2 expression inhibits growth and promotes commitment, recapitulating an early step critical for differentiation. ASB2 is the specificity subunit of an E3 ubiquitin ligase complex and is proposed to exert its effects by regulating the turnover of specific proteins; however, no ASB2 substrates had been identified. Here, we report that ASB2 targets the actin-binding proteins filamin A and B for proteasomal degradation. Knockdown of endogenous ASB2 in leukemia cells delays retinoic acid-induced differentiation and filamin degradation; conversely, ASB2 expression in leukemia cells induces filamin degradation. ASB2 expression inhibits cell spreading, and this effect is recapitulated by knocking down both filamin A and filamin B. Thus, we suggest that ASB2 may regulate hematopoietic cell differentiation by modulating cell spreading and actin remodeling through targeting of filamins for degradation. CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: C. F. Burande, M. L. Heuze, I. Lamsoul, B. Monsarrat, S. Uttenweiler-Joseph, and P. G. Lutz A Label-free Quantitative Proteomics Strategy to Identify E3 Ubiquitin Ligase Substrates Targeted to Proteasome Degradation Mol. Cell. Proteomics, July 1, 2009; 8(7): 1719 - 1727. [Abstract] [Full Text] [PDF]

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