Linked Life Data

18059532

Source:http://linkedlifedata.com/resource/pubmed/id/18059532

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
6
pubmed:dateCreated
2007-12-6
pubmed:abstractText
We investigated the role of cytokine-induced apoptosis inhibitor 1 (CIAPIN1), a newly identified apoptosis inhibitor, in leukemia cell multidrug resistance (MDR) and its possible underlying mechanisms. CIAPIN1 was found to be overexpressed at the mRNA and protein levels in the vincristine-induced multidrug-resistant leukemia cell line HL-60/VCR, compared with HL-60, its parental cell line. In this study, we transfected HL-60 with a eukaryotic expression vector of CIAPIN1. In vitro drug sensitivity assays suggested that HL-60-CIAPIN1 cells conferred resistance to both P-glycoprotein (P-gp)-related and -unrelated drugs. Blocking CIAPIN1 expression in HL-60/VCR cells by CIAPIN1-specific small interfering RNA increased the cells' sensitivity to various chemotherapeutic drugs. Flow cytometry results suggested that CIAPIN1 expression could suppress adriamycin-induced apoptosis, accompanied by a decreased accumulation and increased release of adriamycin. Semiquantitative RT-PCR, Western blot analysis, and luciferase reporter assays suggested that CIAPIN1 could significantly upregulate the expression of MDR-1 and Bcl-2, the transcription of the MDR-1 gene, as well as downregulate the expression of Bax. Additionally, the inhibition of CIAPIN1 expression by RNA interference or P-gp inhibitor could partially reverse CIAPIN1-mediated MDR. Taken together, our findings suggest that downregulating CIAPIN1 could sensitize leukemia cells to chemotherapeutic drugs by downregulating MDR-1 and Bcl-2 and by upregulating Bax, yet not altering either glutathione-S-transferase activity or intracellular glutathione content in leukemia cells. Further study of CIAPIN1's function may reveal more of the mechanisms of leukemia MDR and result in the development of strategies to treat leukemia.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
0829-8211
pubmed:author
pubmed:issnType
Print
pubmed:volume
85
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
741-50
pubmed:meshHeading
pubmed-meshheading:18059532-Blotting, Western, pubmed-meshheading:18059532-Doxorubicin, pubmed-meshheading:18059532-Drug Resistance, Multiple, pubmed-meshheading:18059532-Drug Resistance, Neoplasm, pubmed-meshheading:18059532-Drug Screening Assays, Antitumor, pubmed-meshheading:18059532-Gene Expression Regulation, Neoplastic, pubmed-meshheading:18059532-Glutathione, pubmed-meshheading:18059532-Glutathione Transferase, pubmed-meshheading:18059532-HL-60 Cells, pubmed-meshheading:18059532-Humans, pubmed-meshheading:18059532-Inhibitory Concentration 50, pubmed-meshheading:18059532-Intracellular Signaling Peptides and Proteins, pubmed-meshheading:18059532-Intracellular Space, pubmed-meshheading:18059532-Leukemia, pubmed-meshheading:18059532-Luciferases, pubmed-meshheading:18059532-P-Glycoprotein, pubmed-meshheading:18059532-Transcription, Genetic, pubmed-meshheading:18059532-Transfection, pubmed-meshheading:18059532-Up-Regulation, pubmed-meshheading:18059532-Verapamil, pubmed-meshheading:18059532-bcl-2-Associated X Protein
pubmed:year
2007
pubmed:articleTitle
A new apoptosis inhibitor, CIAPIN1 (cytokine-induced apoptosis inhibitor 1), mediates multidrug resistance in leukemia cells by regulating MDR-1, Bcl-2, and Bax.
pubmed:affiliation
State Key Laboratory of Cancer Biology & Institute of Digestive Diseases, Xijing Hospital, the Fourth Military Medical University, 17 Changle Western Road, Xi'an 710032, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't