ABSTRACT
italic>Dendrobium moniliforme is an important source of Dendrobii Caulis and one of the main sources of authentic Fengdou. The complete chloroplast genome of D. moniliforme was sequenced using Illumina Hiseq technology and its gene map and genomic structure were analyzed. Then comparative and phylogenetic analysis of the complete chloroplast genomes of D. moniliforme and its related species were conducted. The chloroplast genome of D. moniliforme was 150 754 bp in length and had a typical quadripartite structure with a large single copy (LSC, 84 818 bp), a small single copy (SSC, 14 124 bp) and two inverted repeats (IRs, 25 906 bp each). A total of 123 chloroplast genes were annotated, including 77 protein-coding genes, 38 tRNA genes and 8 rRNA genes, of which 17 genes contained introns. Bioinformatics analysis identified 53 SSR sites, most of which had A-T base preference. A phylogenetic tree was constructed using the chloroplast genome sequences of 33 Dendrobium species. The results showed that Dendrobium complex species were clustered in a single large branch, indicating that they were closely related. This study provides a scientific basis for the identification of D. moniliforme and the phylogenetic relationship of D. moniliforme complex species necessary for Herbgenomics research.
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Objective To study the chemical structure and the conformation in the aqueous solution for a novel neutral polysaccharide (DMP2-A) purified from Dendrobium moniliforme. Methods The chemical structural characterization was determined with sugar analyses, methylation analyses, and IR spectroscopic methods. Moreover, the molecular weight and conformation in the aqueous solution were analyzed by size-exclusion chromatography (SEC) combined with laser light scattering (LLS). Results The polysaccharide DMP2-A consisted of 1-linked terminal xylosyl residue, 1,3-, 1,4-, and 1,3,6-linked glucosyl residues, 1,3-, 1,4-, and 1,3,6-linked galactosyl residues, 1,3,5-linked arabinosyl residue and 1,3,6-linked mannosyl group. Moreover, the weight-average molecular (Mw) of polysaccharide DMP2-A was determined to be (1.07 × 104). A small amount of aggregates were formed with the aggregation number of approximately 38 in the 0.15 mol/L NaNO3 aqueous solution. Conclusion DMP2-A is a kind of polysaccharide with multi-branch and complicated structure. It’s the first time that the polysaccharide DMP2-A was isolated and the chemical structure and conformation in aqueous solution were reported.
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The aim of the present study was to explore a sensitive, stable and reliable method for evaluating the phagocytosis, in which RAW264.7 macrophages engulfed GFP-Escherichia coli was tested by high-content screening technology. The study was conducted to optimize the method in evaluation of traditional Chinese medicine in the promotion of macrophage function. By testing macrophages at different ratio of bacteria to cells (multiplicity of infection, MOI), and at different incubation time, we optimized a high content screening method and the experimental parameters to determine the impact of bacteria in macrophages (fluorescence intensity index = be swallowed bacteria/macrophages). The method was used to determine whether Dendrobium moniliforme (DM) have effects on macrophage phagocytosis. The results show that the index has a positive relationship with MOI values, and the highest index was observed at incubation time of 1.5 h. The optimized conditions was 1×104 cells/well with a MOI of 50:1 (bacteria:cells) with incubation of 1.5 h. Under this condition, the relative standard deviation (RSD) was less than 10% in the precision test. Using the method to detect DM regulating macrophage phagocytosis experiment results showed that in 0.31-2.50 g·L-1 concentration range, DM has a dose-response effect in promoting phagocytosis. We successfully established the method for evaluation of macrophage phagocytosis, and proved the activity of DM in promotion of macrophage phagocytosis.
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Dendrobium moniliforme (L.) Sw., an herb of the Orchidaceae family, has long been used in traditional medicine to strengthen bones, nourish the stomach, and promote the production of bodily fluid. Recently, polysaccharides isolated from Dendrobium have been used in functional foods and nutraceutical products. A traditional method to process Dendrobium is to soak fresh stems in an ethanol solution, which is the most important factor to ensure high yields of aqueous-extractable polysaccharides. The present study was carried out to investigate the potential acute toxicity of D. moniliforme aqueous extract (DMAE), by a single oral dose in Sprague-Dawley rats. The test article was orally administered once by gavage to male and female rats at doses of 0, 2,500, and 5,000 mg/kg body weight (n=5 male and female rats for each dose). Throughout the study period, no treatment-related deaths were observed and no adverse effects were noted in clinical signs, body weight, food consumption, serum biochemistry, organ weight, or gross findings at any dose tested. The results show that a single oral administration of DMAE did not induce any toxic effects at a dose below 5,000 mg/kg in rats, and the minimal lethal dose was considered to be over 5,000 mg/kg body weight for both sexes. With respect to cytotoxicity, the cell viability of human embryonic kidney (HEK293) cells was less than 50% when the cells were treated with 10 mg/mL aqueous extract for 24 h.
Subject(s)
Animals , Female , Humans , Male , Rats , Administration, Oral , Biochemistry , Body Weight , Cell Survival , Dendrobium , Dietary Supplements , Ethanol , Functional Food , In Vitro Techniques , Kidney , Medicine, Traditional , Methods , Orchidaceae , Organ Size , Polysaccharides , Rats, Sprague-Dawley , StomachABSTRACT
Objective To investigate the suitable light intensity of plant growth of Dendrobium Sw.through study on photosynthetic characteristics.Methods The photosynthesis curves of light intensity, chlorophyll fluorescence parameter of different light intensity and inductivity of non-photochemical quenching of chlorophyll fluorescence in 3.0?104 lx on three species of Dendrobium Sw.in Huoshan (D.huo- shanens, D.candium, and D.moniliforme) were determined.Results Three species of Dendrobium Sw.were shadow plants for their response on light intensity, light saturation point, light compensate point, net photosynthesis rate, and apparent quantum efficiency are lower during photosynthesis.The photoinhibitory effect was formed on Dendrobium Sw.leaf when they grew in more than 4.0?104 lx.Conclusion Although three species of Dendrobium Sw.in Huoshan grow in (0.2-2.0)?104 lx normally, they are suitable to grow in (2.5-3.0)?104 lx instead of growing more than 4.0?104 lx.