BACKGROUND: Cerebral infarctional animal model provide basis for studying human cerebral infarction(CI). There are two traditional CI models, one is reproduced by craniotomy or electro-coagulation by which supplying artery are blocked, another is achieved by embolus or water gelatin micro-thrombosis. But both are difficult to perform and results were instable, which limit the application. Photochemical injury is a novel way to reproduce CI model on experimental animals.OBJECTIVE: To explore a new method of experimental research of local cerebral infarction model which is induced by photochemical injury in rabbits.DESIGN: Single sample studySETTING: Experimental Animal Center of Nantong University.MATERIALS: This study was conducted at the Experimental Animal Center of Nantong University from May to December 2003 (secondary laboratory). Totally 63 Japanese flap-eared rabbits, with birth age of 10-12 month, 33 females and 30 males, with body mass of 1.7-3.3 kg, were randomly selected.METHODS: After anaesthetized, rabbits were cut at the skin for 2 cm long at the crossing of skull center and posterior canthus, skull was exposed and periosteum was separated, then a round skull window with diameter of 0.5 cm was drilled at 0.5 cm left or (right) to sagittal suture and 0.5 cm posterior to coronal suture, after that, 35 g/L rose Bengal was slowly injected from ear-edge vein in dosage of 1 mL/kg by once. About 3minutes later, cold light source (wave length of 540 nm, power of 140 lx)was used to cast light directly onto the skull window for consecutively 8minutes, then incision was sutured. At postoperative 24 hours, neurological defects were scored in five grades [0 score represent no neural impairments; 1 score: the left posterior limbs displayed decreased muscular tension and attenuated contraction reflex; 2 scores: the left posterior limbs were paralyzed, displaying obvious abduction; 3 scores: rabbit displayed obvious adductive drag with body leant to the opposite side; 4 scores: unable to walk and unconsciousness], rabbits were put to death at postoperative 48 hours, infarctional area and volume were determined and pathological changes was also observed.MAIN OUTCOME MEASURES: Limb movement, infarctional area and volume and pathological changes.RESULTS: CI mode was successfully established on 59 rabbits, the sucmean infarctional area was (0.465±0.012) cm2, and the mean volume changes: Infarctional focus displayed typical pathological changes such as impairment, effusion and inflammation. Gentle impairment could be observed in 22 rabbits (37%), medium in 32 rabbits (54%) and severer in 5rabbits (9%).infarction model has multiple advantages, such as easy performance, quick and good repeatability, it can be used to reproduce experimental models for for a long time with low mortality, benefiting for researches on chronic tional size and depth are under control, meeting the need of researches on observed in photochemical injury, which provide basis for study on the efBut there was still some limitations: Since thrombosis was induced at the terminal artery, unfit for the study of lateral circulation and reperfusion;however it was found more similar to human microvascular diseases, thereby incapable of explaining the pathogenesis of other ischemic strokes.

Mitogen-activated protein kinases (MAPKs) are important signaling transduction components well conserved in eukaryotes and play essential roles in various physiological, developmental and hormonal responses in plant. In the present study, a MAPK gene, designated as DoMPK4 (GenBank accession No. JX297597), is identified from a rare endangered medicinal orchid species D. officinale using the reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) methods. The full length cDNA of DoMPK4 is 1 518 bp in length and encoded a 369 aa protein with a molecular weight of 42.42 kD and an isoelectric point of 5.55. DoMPK4 protein contained a serine/threonine protein kinase active site (158-170), a MAP kinase site (71-174), and eight conserved motifs. DoMPK4 had a transmembrane (214-232) but no signal peptide. Multiple sequence alignment showed that DoMPK4 shared high identities (74.9%-80.6%) with MAPK proteins from various plants. Phylogenetic analysis demonstrated that DoMPK4 belonged to group A of the MAPK evolutionary tree, and is closely related to monocots. Real time quantitative PCR (qPCR) analysis revealed that DoMPK4 is differentially expressed among the five organs including leaf, stem, root, seed, and protocorm-like body (PLB). The transcription level of DoMPK4 is the highest in the PLBs with 17.65 fold, followed by seeds, roots, and stems with 5.84, 2.28, and 1.64 fold, respectively. The progressive enhancement of DoMPK4 transcripts in the developing PLBs compared to that in the germinating seeds, suggests a role of DoMPK4 during the development of embryogenic PLBs formation in D. officinale.

A total of 52 endophytic fungi were isolated from roots and stems of Tibetan medicinal plant Phlomis younghusbandii Mukerjee. These fungal isolates were molecularly identified based on ITS sequnces and 28S sequences distributed to 12 genera, including Phoma, Chaetosphaeronema, Fusarium and Leptosphaeria, etc. Among them, the dominant genus was Phoma. Extracts of all strains were evaluated for anti-HIV-1 integrase activity by using soluable integrase expressed in E. coli BL21 (DE3). The results showed that seven samples from five fungal endophytes PHY-24, PHY-38, PHY-40, PHY-51, PHY-53, which belonged to genus Chaetosphaeronema, inhibited strand transfer reaction catalyzed by HIV-1 integrase with IC50 values, of 6.60, 5.20, 2.86, 7.86, 4.47, 4.56 and 3.23 microg x mL(-1) respectively. In conclusion, the endophytic fungi of Phlomis younghusbandii Mukerjee are valuable for further screening anti-HIV-1 integrase agents.

To observe the clinical therapeutic effect of diabetic peripheral neuropathy (DPN) treated by needling combined with drug, 104 patients with DPN were randomly divided into acupuncture plus drug group and control group, and each group had 52 patients. After treatment of two months, the clinical effective rate in acupuncture plus drug group was 51.9%, and the total effective rate was 88.5%, both of them were better than those in control group (P＜0.05). The needling method of nourishing the kidney and dredging the meridian combined with drug had good clinic effect in the treatment of DPN.

Calcium-dependent protein kinases (CDPKs) play an important regulatory role in the plantarbuscular mycorrhiza/rhizobium nodule symbiosis. However, the biological action of CDPKs in orchid mycorrhiza (OM) symbiosis remains unclear. In the present study, a CDPK encoding gene, designated as DoCPK1 (GenBank accession No. JX193703), was identified from D. officinale roots infected by an OM fungus-Mycena sp. using the reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) methods, for the first time. The full length cDNA of DoCPK1 was 2137 bp in length and encoded a 534 aa protein with a molecular weight of 59.61 kD and an isoelectric point (pI) of 6.03. The deduced DoCPK1 protein contained the conserved serine/threonine-protein kinase catalytic domain and four Ca2+ binding EF hand motifs. Multiple sequence alignment demonstrated that DoCPK1 was highly homologous (85%) to the Panax ginseng PgCPK1 (ACY78680), followed by CDPKs genes from wheat, rice, and Arabidopsis (ABD98803, ADM14342, Q9ZSA2, respectively). Phylogenetic analysis showed that DoCPK1 was closely related to CDPKs genes from monocots, such as wheat, maize and rice. Real time quantitative PCR (qPCR) analysis revealed that DoCPK1 was constitutively expressed in the included tissues and the transcript levels were in the order of roots > stems > seeds > leaves. Furthermore, DoCPK1 transcripts were significantly accumulated in roots 30 d after fungal infection, with 5.16 fold compared to that of the mock roots, indicating involvement of DoCPK1 during the early interaction between D. officinale and Mycena sp., and a possible role in the symbiosis process. This study firstly provided important clues of a CDPK gene associated with OM symbiosis, and will be useful for further functional determination of the gene involving in D. officinale and Mycena sp. symbiosis.

The mitogen-activated protein kinase (MAPK) cascade, composed of MAPK kinase kinase (MAP3K), MAPK kinase (MAP2K), and MAPK, is abundantly conserved in all eukaryotes. MAPK along with MAPK cascade plays a vital regulatory role in the plant-arbuscular mycorrhiza/rhizobium nodule symbioses. However, the biological function of MAPK in orchid mycorrhiza (OM) symbiosis remains elusive. In the present study, a MAPK gene, designated as DoMPK1 (GenBank accession No. JX297594), was identified from D. officinale roots infected by an OM fungus-Mycena sp. using the reverse transcription polymerase chain reaction (RT-PCR) and rapid amplification of cDNA ends (RACE) methods. The full length cDNA of DoMPK1 was 1 263 bp and encoded a 372 aa protein with a molecular weight of 42.61 kD and an isoelectric point (pI) of 6.07. The deduced DoMPK1 protein contained the conserved serine/threonine-protein kinase catalytic domain (39-325) and MAP kinase signature (77-177). Multiple sequence alignment and phylogenetic analysis demonstrated that DoMPK1 was highly homologous (71%-85%) to MAPK genes from various plant species and was closely related to those from monocots. Real time quantitative PCR (qPCR) analysis revealed that DoMPK1 was constitutively expressed in leaves, stems, roots and seeds, and the transcript abundance was not significantly different in the four included tissues. Furthermore, DoMPK1 transcript was markedly induced in roots at 30 d after fungal infection, with 7.91 fold compared to that of the mock inoculated roots, suggesting implication of DoMPK1 in the early D. officinale and Mycena sp. interaction and an essential role in the symbiosis. Our study characterized a MAPK gene associated with OM symbiosis for the first time, and will be helpful for further functional elucidation of DoMPK1 involving in D. officinale and Mycena sp. symbiotic interaction.

As the most commonly used antipyretic and analgesic drug,paracetamol(PA)coexists with neuro-transmitter dopamine(DA)in real biological samples.Their simultaneous determination is extremely important for human health,but they also interfere with each other.In order to improve the conductivity,adsorption affinity,sensitivity,and selectivity of TiO2-based electrochemical sensor,N-doped carbon@-TiO2 double-shelled hollow sphere(H-C/N@TiO2)is designed and synthesized by simple alcoholic and hydrothermal method,using polystyrene sphere(PS)as a template.Meanwhile,TiO2 hollow spheres(H-TiO2)or N-doped carbon hollow spheres(H-C/N)are also prepared by the same method.H-C/N@TiO2 has good conductivity,charge separation,and the highly enhanced and stable current responses for the detection of PA and DA.The detection limit and linear range are 50.0 nmol/L and 0.3-50 μmol/L for PA,40.0 nmol/L and 0.3-50 μmol/L for DA,respectively,which are better than those of carbon-based sen-sors.Moreover,this electrochemical sensor,with high selectivity,strong anti-interference,high reli-ability,and long time durability,can be used for the simultaneous detection of PA and DA in human blood serum and saliva.The high electrochemical performance of H-C/N@TiO2 is attributed to the multi-functional combination of different layers,because of good conductivity,absorption and electrons transfer ability from in-situ N-doped carbon and electrocatalytic activity from TiO2.

The column chromatography on silica gel, sephadex LH-20 preparative HPLC were used to separate and purify the compounds from the stems of Dendrobium candidum. Twenty compounds were isolated and identified as 3,4'-dihydroxy-5-methoxybibenzyl(1), dihydroresveratrol(2), dendromoniliside E(3), denbinobin(4),2,4,7-trihydroxy-9, 10-dihydrophenanthrene(5), aduncin(6), (-)-loliolide(7), adenosine(8), uridine(9), guanosine(10), sucrose(11), 5-hydroxymethyl-furaldehyde(12), n-octacostyl ferulate(13), defuscin(14), n-triacontyl cis-p-coumarate(15), daucosterol(16), beta-sitosterol(17), hexadecanoic acid(18), hentriacontane(19), and heptadecanoic acid(20). Their structures were elucidated on the basis of spectroscopic data and physicochemical properties. All of the compounds were isolated from this plant for the first time.
Dendrobium ; chemistry ; Molecular Structure ; Plant Extracts ; chemistry ; isolation & purification