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Aim Drug resistance is one of the major hinders on cancer treatments. α-enolase ( eno1 ) was closely related to the generation and development of drug resistance. This article aims to study the effect of eno1 on cell growth and drug resistance in human chro-nic myeloid leukemia cell line K562/A02 . Methods We screened three eno1 stable silencing cells K562/A02-sheno1 and its control cells K562/A02-shcon. Cell count assay was performed to test cell growth, MTT assay was used to test cell proliferation, flow cytometry was used to test the intra-cellular Rho123 content, the expression of genes were tested by real-time PCR assay and western blot assay on mRNA level and protein level, respectively. Results eno1 was o-ver-expressed in K562/A02 cells and its expression was increased by ( 2. 85 ± 0. 56 ) times and ( 1. 43 ± 0. 05 ) times on mRNA level and protein level com-pared to K562 cells. However, there was no difference in cell growth rate between K562/A02 cells and K562 cells. K562/A02-sheno1 cells showed lower cell growth rate and higher drug sensitivity to anti-cancer drugs taxol and doxorubicin. Moreover the Rho123 content was increased in K562/A02-sheno1 cells. The expression of MDR1 decreased in both mRNA level and protein level in K562/A02-sheno1 cells. Conclusion eno1 silencing could suppress cell growth, reverse drug resistance and increase its drug sensitivity in K562/A02 cells, and the mechanism was associated with the MDR1 gene.
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ObjectiveTo analyze the clinicopathologic characteristics and survival of ethnic minority female patients with triple negative breast cancer (TNBC) from Xinjiang Uygur Autonomous Region.Methods The clinicopathological characteristics,including age at diagnosis,size of tumor mass,lymphnode involvement,adjuvant therapy,recurrence of disease and survival of patient,of 48 ethnic minority patient cases with TNBC negative for estrogen receptor (ER),progesterone receptor (PR) and human epidermal growth factor receptor-2 (Her-2) were analyzed,whom were treated in our hospital from January 2001 to December 2005,including age at diagnosis,size of tumor mass,lymph node involvement,adjuvant therapy,recurrence of disease and survival of patients.ResultsOf the 48 patients,median age was 47 years,and 83.3 ％ (39 cases) of patients had stage Ⅱ or Ⅲ disease.The majority(85.4 ％,41 cases)of pathological types were grade Ⅱ or Ⅲ invasive ductal carcinomas,and lymph node involvement was detected in 56.2 ％ (27 cases) of these patients at initial diagnosis.46 patients were followed and had adjuvant therapy.Tumor-free survival and overall survival at 5 years were 43.5 ％ (20/46) and 52.2 ％ (24/46),respectively.Patients with lymph node involved had only 38.5 ％ (10/46) of overall survival at 5 years.ConclusionThe incidence of triple negative breast cancer of female patients in Xinjiang multiple minority groups is similar to domestic study,and the rates of over all survival is lower than that in Han Chinese patients. The female patients with TNBC in Xinjiang Uygur Autonomous Region multiple minority groups showed higher lymph node involvement at initial diagnosis and more distal metastasis.Patients with lymph node involved had poor survival.