Sphingobacterium chuzhouense sp. nov., isolated from farmland soil.

A novel Gram-staining-negative bacterium, designated DH-5T, was isolated from a farmland soil in Chuzhou, Anhui province, China. Cells of strain DH-5T were aerobic, non-motile, non-spore-forming and rod-shaped. The organism grew at 20-37 °C, pH 6.0-9.0 and with 0-5 % NaCl (w/v). The DNA G+C content was 42.8 mol%. The major fatty acids (>5 %) were iso-C15 : 0, summed feature 3 (C16 : 1ω7c and/or C16 : 1ω6c), iso-C17 : 0 3-OH and C16 : 0. The respiratory quinone was MK-7, and the major polar lipids were phosphatidylethanolamine and phosphoglycolipid. Phylogenetic analysis based on 16S rRNA gene sequences showed that strain DH-5T was a member of the genus Sphingobacterium and shared the highest similarity with Sphingobacterium gobiense H7T (96.0 %), followed by Sphingobacterium arenae H-12T (94.5 %). Strain DH-5T exhibited low DNA-DNA relatedness with S. gobiense H7T (35.1±1.4 %) and S. arenae H-12T (21.4±1.0 %). On the basis of phenotypic, genotypic and phylogenetic evidence, DH-5T is considered to represent a novel species of the genus Sphingobacterium, for which the name Sphingobacterium chuzhouense sp. nov. is proposed. The type strain is DH-5T (=ACCC 19856T=KCTC 42746T).

[The relationship between chronic periodontitis and the instability of carotid atherosclerotic plaque by serum level of MMP-9, MCP-1 and MMP-7].

PURPOSE: To study the serum level of matrix metalloproteinase-9 (MMP-9), matrix metalloproteinase-7(MMP-7) and monocyte chemo attractant protein-1(MCP-1) in patients with chronic periodontitis in whom the stability of carotid atherosclerotic plaque is affected. METHODS: One hundred and twenty-nine patients were collected from People's Hospital of Liaoning Province, and divided into 3 groups. Group A (healthy group): 32 cases; Group B (periodontitis group): 31 cases; Group C (periodontitis with carotid atherosclerosis plaque group): 66 cases. According to carotid atherosclerotic plaque stability, Group C was further divided into carotid atherosclerotic plaque stable subgroup (C1, 30 cases) and unstable subgroup (C2, 36 cases). Each patient received periodontal examination, and serum levels of MMP-9, MMP-7, MCP-1 were assayed by ELISA. The data was statistically analyzed with SPSS19.0 software package. RESULTS: The age, gender, drinking and smoking history in each group had no significant difference (P>0.05). The periodontal baseline status in group B was worse than group A, in group C was worse than group B and in group C2 was worse than group C1, and the differences were significant (P<0.05). Serum level of MMP-9, MCP-1 and MMP-7 in group C was significantly higher than in group B and group A (P<0.05), and in group B were significantly higher than group A (P<0.05), in group C2 was significantly higher than in group C1 (P<0.05). Serum level of MMP-9, MCP-1 and MMP-7 were correlated with carotid atherosclerotic plaque stability (r=0.989, P<0.05; r=0.605, P<0.05; r=0.389, P<0.05, respectively). CONCLUSIONS: Serum inflammatory cytokines MMP-9, MMP-7 and MCP-1 are associated with the development of periodontitis. The serum inflammatory cytokines MMP-9, MCP-1, MMP-7 as mediating factors may indicate the severity of periodontal disease and affect the stability of carotid atherosclerotic plaques.

Luteimonas soli sp. nov., isolated from farmland soil.

A yellow-pigmented bacterial strain, designated Y2T, was isolated from farmland soil in Bengbu, Anhui province, China. Cells of strain Y2T were Gram-stain-negative, strictly aerobic, non-motile and rod-shaped. Strain Y2T grew optimally at pH 7.0, 30 °C and in the presence of 2 % (w/v) NaCl. The DNA G+C content was 68.9 mol%. The major fatty acids (>5 %) were iso-C15 : 0, iso-C17 : 0, summed feature 9 (C16 : 0 10-methyl and/or iso-C17 : 1ω9c), iso-C11 : 0 3-OH and iso-C11 : 0. The major respiratory quinone was ubiquinone-8 (Q-8), and the major polar lipids were phosphatidylethanolamine, phosphatidylglycerol and diphosphatidylglycerol. Phylogenetic analysis of the 16S rRNA gene sequences showed that strain Y2T was most closely related to Luteimonas mephitis B1953/27.1T (99.1 % 16S rRNA gene sequence similarity), followed by Luteimonas lutimaris G3T (98.6 %), Luteimonas abyssi XH031T (96.2 %) and Luteimonas aquatica RIB1-20T (96.0 %). Strain Y2T exhibited low DNA-DNA relatedness with Luteimonas mephitis B1953/27.1T (43.6 ± 0.5 %) and Luteimonas lutimaris G3T (43.9 ± 2.1 %). On the basis of phenotypic, genotypic and phylogenetic evidence, strain Y2T represents a novel species of the genus Luteimonas, for which the name Luteimonas soli sp. nov. is proposed. The type strain is Y2T ( = ACCC 19799T = KCTC 42441T).