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Identification and characterization of a novel gene that is upregulated in leukaemia cells by nitric oxide
Author(s) -
Shami Paul J.,
Kanai Nobuko,
Wang Lai Y.,
Vreeke Theresa M.,
Parker Charles J.
Publication year - 2001
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1046/j.1365-2141.2001.02491.x
Subject(s) - microbiology and biotechnology , northern blot , gene , nitric oxide , gene expression , retinoic acid , complementary dna , biology , peptide sequence , nitric oxide synthase , downregulation and upregulation , chemistry , biochemistry , endocrinology
Nitric oxide (NO) inhibits growth and induces differentiation in acute myeloid leukaemia (AML) cells. To identify genes associated with these processes, we studied the effect of NO on AML gene expression using the technique of Representational Difference Analysis. Exposure of HL‐60 cells to the NO donor DETA‐NO for 24 h induced the expression of a novel gene that was named rno (regulated by nitric oxide). Treatment of HL‐60 cells with dimethyl sulphoxide induced expression of rno , but treatment with Vitamin D 3 or all‐ trans retinoic acid did not. Upregulation of rno by NO was cGMP independent. Northern blot analysis indicated that constitutive expression of the novel gene was limited to leucocytes. Three isoforms of rno were identified. An rno cDNA clone was obtained by screening a human leucocyte library. The nucleotide sequence of the open reading frame shared significant homology with that of the human ribonuclease/angiogenin inhibitor (RI). The predicted amino acid sequence indicated that, like RI, rno is leucine and cysteine rich and is comprised of a series of repetitive elements (leucine‐rich repeats) that may mediate macromolecular interactions. Enhancement of expression of rno may be a component of the process by which differentiation and growth inhibition of leukaemia cells is induced by NO.