Effects of biocontrol strain BZJN1 and streptoprofen on physicochemical properties and bacteria structure of rhizosphere soil of Atractylodes macrocephala / 中国中药杂志

Soil microorganisms are one of the important biological indictors of soil quality and can reflct the comprehensive ecological environment characteristics of the soil. The research of soil microbial diversity is the key to know the ecological functions and balance with soil. In this paper, high-throughput sequencing on PCR-amplified 16 S rRNA gene V3-V4 fragments was used to determine the bacterial diversity in rhizosphere soil of A. macrocephala under the treatment with BZJN1 or streptoprofen. The results showed that there were no significant differences of the bacteria in A. macrocephala rhizosphere soil of the streptoprofen treatment group and the biocontrol BZJN1 treatment group. All the soil bacteria was classified into 25 categories,67 classes, 108 orders, 167 families and 271 generas, except some unidentified bacteria. Proteobacteria(30.7%-34.8%) was the dominant phylum, of which Alphaproteobacteria(16.8%-18.5%) was the dominant subgroup. Compared with the control group, the relative abundance of multiple phylums bacteria in the rhizosphere soil of A. macrocephala was significantly changed in the streptoprofen treatment group and the biocontrol BZJN1 treatment group. In addition, RDA analysis showed that there was connection with different environmental factors and microbial communities. The abundance of the three genera in the rhizosphere soil of A. macrocephala was significantly positively correlated with Invertase, Urease and AP. PICRUSt function prediction results showed that BZNJ1 could enhance some bacterial functions and promote the plant growth. Biocontrol is a new type of green and safety control pest method. BZNJ1 significantly enhances some bacterial functions on the basis of effectively preventing root rot of A. macrocephala and promoting plant growth, and has no significant effect on the soil bacterial community structure. All the results can provide theoretical support for popularization of BZNJ1.

[C/EBPß promotes NF-κB-mediated invasion and migration of human renal carcinoma 786-O cells].

OBJECTIVE: To explore the regulatory role of CCAAT/enhancer-binding protein beta (C/EBPß) in invasion and migration of 786-O human renal cancer cells. METHODS: C/EBPß adenoviral overexpression vector (pAd-C/EBPß) and C/EBPß siRNA were constructed and respectively transfered into 786-O cells. Wound healing and Transwell(TM) invasion methods were used to detect the invasion and migration of the cells. Laser scanning confocal microscopy was applied to determine the translocation of nuclear factor κB (NF-κB), the central regulator of epithelial-mesenchymal transition (EMT); Western blotting was performed to examine the levels of EMT key markers E-cadherin, vimentin and tenascin. RESULTS: When C/EBPß was overexpressed, invasion and migration of 786-O cells were enhanced, translocation of NF-κB increased, E-cadherin level was reduced, and vimentin and tenascin levels were elevated. When C/EBPß was knocked down, the results were completely opposite to those of C/EBPß overexpression: invasion and migration of 786-O cells were inhibited, translocation of NF-κB decreased, E-cadherin level was elevated, and vimentin and tenascin expressions were suppressed. Moreover, the above changes were not found in the cells that co-treated with pAd-C/EBPß and C/EBPß siRNA. CONCLUSION: C/EBPß could promote the invasion and migration of human renal carcinoma 786-O cells, and had an inducing effect on nuclear translocation of NF-κB in 786-O cells.