title: [Influence of human mesenchymal stem cells on cell proliferation and chemo-sensitivity of K562 cells].
abstract: This study was aimed to compare K562 cell proliferation, chemo-sensitivity and alteration of MDR1 before and after adhesive culture with MSC, so as to evaluate the relationship between chemodrug-resistance of leukemia cells and hemopoietic microenvironment. K562 cell cultivated in suspension and adhesively cultivated with MSC were collected respectively and cell proliferation curves were drawn; the cell cycle was determined by flow cytometry; the effect of chemotherapy on cellular viability and apoptosis of K562 cell was investigated, the MDR1 gene expression was determined by RT-PCR. The results showed that K562 cells adhesively cultivated with MSC were inhibited and cells in G0/G1 increased (P < 0.05), cells in S phase decreased (P < 0.05) and those in G0/G1 increased (P < 0.01), compared with that cultivated in suspension. In process of daunomycin-inducing apoptosis, K562 cell apoptosis in the adhesive culture with MSC was inhibited (P < 0.05). MDR1 gene expression in K562 cells was not induced or altered by adhesive co-cultivation. It is concluded that by co-culture of cell-cell contact with MSC, growth suppression and induction of chemo-resistance of K562 cells take place. The mechanism, however, seems not relevant with MDR1.
authors.affiliation: Department of Hematology and Oncology, the China-Japan United Hospital, Jilin University, Changchun 130031, China.
authors.forename: Yu-Mei
authors.initials: YM
authors.lastname: Lin
authors.forename: Li-Mei
authors.initials: LM
authors.lastname: Bu
authors.forename: Shao-Juan
authors.initials: SJ
authors.lastname: Yang
authors.forename: Shen
authors.initials: S
authors.lastname: Gao
authors.forename: Gui-Zhen
authors.initials: GZ
authors.lastname: Zhang
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000096:biosynthesis* / Q000235:genetics; D017209:Apoptosis / Q000502:physiology*; D001854:Bone Marrow Cells / Q000166:cytology; D049109:Cell Proliferation; D002478:Cells, Cultured; D018920:Coculture Techniques; D003630:Daunorubicin / Q000494:pharmacology; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D006801:Humans; D020014:K562 Cells; D059630:Mesenchymal Stem Cells / Q000166:cytology*
chemical_list: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D003630:Daunorubicin