Ke-Jun Li

Dalian Medical University, Lü-ta-shih, Liaoning, China

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Publications (3)6.15 Total impact

  • Wei Wang · Wei Sun · Lei Dong · Xiaotong Qu · Jin Shi · Ke-Jun Li · Bing Li · Da-Peng Ma
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    ABSTRACT: A specific, sensitive and accurate analytical LC-MS/MS assay was developed for the simultaneous determination of two steroidal glycosides, tenacissoside H and tenacissoside I, in rat plasma. An Agilent ZORBAX SB-C18 column was used with an isocratic mobile phase system composed of methanol-water-formic acid (70:30:0.1, v/v/v) at a flow rate of 0.3 mL/min. The analysis was performed on a positive ionization electrospray mass spectrometer via selected reaction monitoring mode scan. One-step protein precipitation with acetonitrile was chosen to extract the analytes from plasma. The lower limits of quantification were 0.9 ng/mL for tenacissoside H and tenacissoside I. The intra- and inter-day precisions were 2.03-11.56 and 3.76-11.62%, respectively, and the accuracies were <110.28% at all quality control levels. The validated method was applied to a pharmacokinetic study in rats after oral gavage of Marsdenia tenacissima extract. Copyright © 2014 John Wiley & Sons, Ltd.
    No preview · Article · Sep 2014 · Biomedical Chromatography
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    ABSTRACT: Resistance to chemotherapy is a major obstacle for the effective treatment of breast cancer and is partially due to the presence of drug resistant stem cell-like side population (SP). Previous studies have shown elevated miR-125b is associated with chemoresistance and metastasis; however, the relationship between miR-125b and SP cells remains unknown. In this study, we isolated and characterized SP cells in a panel of breast cancer cell lines and primary cancer cells from breast cancer patients. SP cells showed cancer stem cells properties, including self-renewal, resistance to chemotherapy and high expression of stem cell markers. The percentage of SP cells was higher in chemotherapy resistant patients compared to that in chemotherapy responsive patients (5.8 ± 2.4% in non-responsive patients vs 1.2 ± 0.5% in responsive patients, p = 0.012). Importantly, SP cells had higher level of miR-125b than NSP cells and the elevated miR-125b expression in chemoresistant cancer cells were due to high percentage of SP cells. Overexpression of miR-125b correlated with an increase in tumor SP and cancer stem cell property, whereas knockdown of miR-125b correlated with decreased incidence of SP. In addition, miR-125b overexpression in breast cancer cells induced epithelial-mesenchymal transition (EMT)-like cellular marker alteration, suggesting a potential mechanism of miR-125b in the regulation of cancer stem-like SP cells. Taken together, these results suggest an important role for miR-125b in breast cancer chemoresistance by maintaining cancer stem-like SP fraction, and raise the possibility that miR-125b may be a significant prognostic response marker for cancer therapy. J. Cell. Biochem. © 2013 Wiley Periodicals, Inc.
    No preview · Article · Oct 2013 · Journal of Cellular Biochemistry
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    ABSTRACT: To explore the clinical value of laparoscopy and laparoscopic ultrasonography (LUS) in judging the resectability of pancreatic head cancer. LUS was employed as a prospective diagnosis of tumor staging before exploratory laparotomy in 22 patients diagnosed with pancreatic head cancer to identify whether the liver and peritoneum had small metastases or local invasion to the portal vein, superior mesenteric vessel, aorta, inferior vena cava. In the 22 patients receiving laparoscopy and LUS, we found peritoneal or surface liver metastases (3 patients), hepatic parenchyma metastases (1), and pancreatitis proved by biopsy under ultrasound guidance (1). Laparotomy was avoided in these 5 patients. Of the remaining 17 patients, 8 patients, including 2 patients with portal vein emboli due to tumor metastases had hypertrophic lymph nodes or tumor invasion of local vessels in the peritoneal cavity, retroperitoneum, and omentum and the other 9 patients had resectable tumors shown by LUS. The 17 patients were subjected to exploratory laparotomy, and pancreaticoduodenectomy was successful in 8 patients. Laparoscopy and LUS can be used to precisely estimate the possibility of resection of pancreatic head cancer, and prevent unnecessary exploratory laparotomy and its complications. It can be used as a routine examination before exploratory laparotomy.
    No preview · Article · Dec 2003 · Hepatobiliary & pancreatic diseases international: HBPD INT