title: Chlorambucil-sensitive and -resistant lymphoid cells display different responses to the histone deacetylase inhibitor, sodium butyrate.
abstract: Clinical chemoresistance is a frequent complication of alkylating agent treatment of malignant tumours. Chromatin remodelling using histone deacetylase inhibitors (e.g., sodium butyrate, NaBu) may increase target cell chemosensitivity. Apoptotic responses and expression of chromatin modifying enzymes in lymphoid cell lines, LP-1 and NCI-H929, to chlorambucil (CLB) and/or NaBu were examined in this study. NaBu augmented the apoptotic response in CLB-resistant LP-1 cells but antagonised it in CLB-sensitive NCI-H929 cells. CLB increased expression of methyltransferase I and histone acetyltransferase I in both cell lines while NaBu had only small effect. CLB-induced increased gene expression was attenuated by NaBu in CLB-sensitive NCI-H929 cells but not in resistant LP-1 cells. These results suggest that chromatin modifying agents may have differential effects on cells depending on their chemosensitivity.
authors.affiliation: The Department of Pathology, The University of Melbourne, Parkville, Victoria 3052, Australia.
authors.forename: Faith A A
authors.initials: FA
authors.lastname: Kwa
authors.forename: Merrole
authors.initials: M
authors.lastname: Cole-Sinclair
authors.forename: Miroslav
authors.initials: M
authors.lastname: Kapuscinski
mesh_terms: D018906:Antineoplastic Agents, Alkylating / Q000494:pharmacology*; D017209:Apoptosis; D002087:Butyrates / Q000494:pharmacology*; D045744:Cell Line, Tumor; D002699:Chlorambucil / Q000494:pharmacology; D042002:Chromatin Assembly and Disassembly / Q000187:drug effects*; D000076123:DNA (Cytosine-5-)-Methyltransferase 1; D004248:DNA (Cytosine-5-)-Methyltransferases / Q000378:metabolism; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D051548:Histone Acetyltransferases / Q000378:metabolism; D056572:Histone Deacetylase Inhibitors / Q000494:pharmacology*; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects*
chemical_list: D018906:Antineoplastic Agents, Alkylating; D002087:Butyrates; D056572:Histone Deacetylase Inhibitors; D002699:Chlorambucil; D000076123:DNA (Cytosine-5-)-Methyltransferase 1; D004248:DNA (Cytosine-5-)-Methyltransferases; D051548:Histone Acetyltransferases; C110880:histone acetyltransferase type B complex