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Zhang X.-X.,Tianjin University of Commerce | Li Y.,Tianjin University of Commerce | Wang S.-Y.,Tianjin University of Commerce | Wang Y.-Y.,The First Center Hospital of Tianjin | And 6 more authors.
Applied Biochemistry and Microbiology | Year: 2015

Recent studies have shown that the human colostrum and milk are a continuous supply of commensal, mutualistic and/or potentially probiotic bacteria to the infant gut. The diversity of complex bacterial communities in human milk can be used for the screening of novel bacteria with a potential interest for industry. Here, a protease-producing strain R75E was isolated from human colostrum and identified as Bacillus cereus based on its morphological, physiological and biochemical properties and molecular characterization. B. cereus R75E was found to produce 2 types of proteases with molecular weights of 106 and 95 kDa. Tandem mass spectrometry analysis has shown that both of these proteases belong to the 965-aa collagenase (GenBank accession no. KDB42252.1) of B. cereus. By PCR, the B. cereus R75E collagenase was identified just in the same DNA sequence as 965-aa collagenase. Its high sensitivity to EDTA verified that the enzyme is metalloprotease as expected by protein domain analysis. The present collagenase demonstrated high efficiency for the degradation of the native type I collagen, suggesting its potential applications to the degradation of animal organisms. © 2015, Pleiades Publishing, Inc.

Wu D.,The First Center Hospital of Tianjin | Shen Z.-Y.,The First Center Hospital of Tianjin | Zhang Y.-M.,The First Center Hospital of Tianjin | Wang J.,The First Center Hospital of Tianjin | And 3 more authors.
BMC Cancer | Year: 2015

Background: Liver transplantation is a treatment option for combined hepatocellular and cholangiocellular carcinoma (cHCC-CC) but its prognostic significance remains unclear. The present study aimed to evaluate the therapeutic effects of liver transplantation on cHCC-CC and analyze the clinicopathological factors affecting prognosis. Methods: Retrospective analysis of the clinicopathological data of a case series of 21 patients with cHCC-CC who underwent orthotopic liver transplantation from April 2000 to April 2011 was performed. Cumulative survival rate and tumor-free survival rate were calculated using the Kaplan-Meier method followed by the log-rank test. Results: The operative survival rate of the 21 patients was 100%; the 30 day mortality was 4.8% (1/21) and 90-day mortality was 9.5% (2/21); 1-, 2-, 3-, and 5-year overall cumulative survival rates were 64%, 47%, 39%, and 39%, respectively; and the corresponding cumulative tumor-free survival rates were 64%, 37%, 30%, and 30%, respectively. Cumulative tumor diameter, lymph node metastasis, macroscopic portal vein tumor thrombus, and mixed states according to Allen typing were identified as the primary influencing factors of poor prognosis (all P<0.05). Conclusion: Liver transplantation may be an effective therapeutic method for the treatment of cHCC-CC. Strict screening of potential liver transplantation candidates with cHCC-CC can help reduce the risks of tumor recurrence and metastasis. © 2015 Wu et al.; licensee BioMed Central.

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