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Fang Jianming,Huang Jianxin,Zhang Xiaodong 한국응용생명화학회 2022 Applied Biological Chemistry (Appl Biol Chem) Vol.65 No.4
Fibronectin 1-derived circular RNA hsa_circ_0058092 is a novel potential oncogene in gastric cancer (GC). Yet, previous studies have not determined the role of hsa_circ_0058092 GC progression and the underlying mechanism. Herein, we investigated its role and competing endogenous RNA (ceRNA) pathway in the development of GC. The results showed that hsa_circ_0058092 was substantially upregulated in GC patients’ tissues and cells, allied with upregulated SIX1 and downregulated miR-1294 compared with normal gastric tissues and cells. There were linear correlations among hsa_circ_0058092, miR-1294 and SIX1 levels in GC tumors. Moreover, hsa_circ_0058092 acted as a miR-1294 sponge, and miR-1294 targeted SIX1. Functionally, colony formation, EdU positive rate, tumor growth of GC cells, as well as ki-67 expression in xenograft tumors was greatly suppressed by depressing hsa_circ_0058092. Besides, hsa_circ_0058092 knockdown repressed GC cell migration and invasion, accompanied with increased E-cadherin expression and descended N-cadherin expression. Moreover, inhibiting miR-1294 expression could counteract hsa_circ_0058092 knockdown-mediated effects in GC cells. The inhibitory effects of miR-1294 mimics on GC cell malignancy were relieved by increasing SIX1 expression. Further, hsa_circ_0058092 depletion repressed SIX1 protein expression by interacting with miR-1294. Hsa_circ_0058092 was oncogenic in GC cell proliferation and motility via ceRNA pathway of hsa_circ_0058092/miR-1294/SIX1.
Hanjie Ying,Ting Fang,Xiaochun Chen,Nan Li,He Song,Jianxin Bai,Jian Xiong 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.6
Statistical experimental designs were used to optimize the composition of culture media for the production of D-ribose by Bacillus subtilis. A fractional factorial design 2(5-2) was used to determine medium components that significantly affected D-ribose production. The concentrations of glucose and (NH4)2SO4 were the significant factors. Central composite design and response surface methodology were then used to estimate the quadratic response surface and determine the factor levels for maximum production of D-ribose. Finally, the optimal medium composition was obtained (g/L): glucose, 172.75; (NH4) 2SO4, 13.2; yeast powder, 4; corn steep liquor, 8 and MnSO4, 0.5. This optimization strategy increased D-ribose production from 73.21 g/L to 88.57 g/L, an increase of 22% compared with the original conditions. The D-ribose production yield to glucose concentration was also enhanced from 0.37 g/g to 0.52 g/g. Confirmatory experiments were also performed to demonstrate the accuracy of the model. Under the optimal medium using ammonia to control pH in a 5 L fermenter, the D-ribose yield was increased to 95.28 g/L after 3 days of cultivation at 37 oC.