Alzheimer's disease (AD) is the most frequent type of dementia in elderly,which has been regarded as a neurodegenerative disease.The traditional point of view considers that AD and vascular dementia are two different types of dementias both from their pathogenesis and treatment;however,in recent years,a growing body of evidence indicates that the vascular factors are playing an important role in the development and occurrence of AD.This article reviews cerebral ischemia and its risk factors including the effects of hypertension,diabetes,and cholesterol in the development and occurrence of AD,so as to provide new strategies in preventing,and delaying the occurrence and progression of AD.

Plant expression cassette for TaDREB from wheat was constructed into plasmid pBIR1.Aloe stems were used as explants for the transformation mediated by Agrobaterium.Infected tissues were selected using G418 to generate transformants.In total,58 resistant plantlets to the antibiotics were obtained from the infected explants.The designed primers according to the selective gene npt II and the target gene TaDREB were used to analyze all of the G418 resistant plantlets.PCR results demonstrated that TaDREB were successful transferred into aloe genomic with the transformation efficiency of 0.5%.The transgenic aloe plants were treated under 4℃ for two weeks and then at-20℃ for 30min.The treatment showed that the leaves of negative plants appeared severe evidence of freeze injury with brown,withered and translucent,while the positive plants appeared good growing condition.The activities of enzymes such as peroxidase(POD)and superoxide dismutase(SOD)of transgenic plants which were stressed for 14 days under low temperature were analyzed.The results indicated that the trend of SOD and POD activities in transgenic plants was down-up-up-up,and that in non-transgenic plants was down-up-down-down.The average value of relative electrical conductivity in the positive plants was 0.456 which was lower than 0.685 in the negative plants.It is supposed that transformation of the kind of gene could improve the resistant ability of aloe to low temperature.

The perivascular space is formed by the pia mater around the blood vessels and participates in the fluid exchange and waste clearance in the brain. The enlarged perivascular space (EPVS) indicates the disorder of brain clearance mechanism, which is closely related to the occurrence and development of a variety of clinical diseases. In recent years, there are a lot of studies on the pathogenesis and influencing factors of EPVS. This article reviews its anatomy, neuroimaging, pathogenesis, and risk factors.

After 28 foreign species of AM fungi were inoculated in sterilized soil, the effects of the AM mycorrhizal colonization and the medicine quality of Paris polyphylla var. yunnanensis were observed by combination of inoculation test in pot at room temperature and instrumental analysis. The results showed that, compared with control group (CK), the inoculation of foreign AM fungi in the soil influenced the spore density, mycorrhizal infection rate, and colonization intensity of AM fungi in root system of P. polyphylla var. yunnanensis. The inoculation of foreign AM fungi enhanced the mycorrhiza viability of P. polyphylla var. yunnanensis by increasing the activity of succinic dehydrogenase (SDH) and alkaline phosphatase (ALP) in intraradical hyphae. The content of single steroid saponin in rhizome of P. polyphylla var. yunnanensis showed variation after P. polyphylla var. yunnanensis was inoculated by different foreign species of AM fungi, which was beneficial for increasing the medicine quality; however, the kinds of steroid saponin showed no difference. In a degree, there was a selectivity of symbiosis between P. polyphylla var. yunnanensis and foreign AM fungi. And we found that the Claroideoglomus claroideum and Racocetra coralloidea were best foreign AM fungi species for cultivating P. polyphylla var. yunnanensis under field condition.
Chromatography, High Pressure Liquid ; Drugs, Chinese Herbal ; analysis ; Fungi ; classification ; growth & development ; Liliaceae ; chemistry ; growth & development ; microbiology ; Mycorrhizae ; classification ; growth & development ; Plant Roots ; chemistry ; growth & development ; microbiology ; Quality Control

Bacterial biodiversities of microbial mat and sediments, which were sampled from thermal springs of Tengchong Rehai in Yunnan, were preliminarily studied with PCR-denaturing gradient gel electrophoresis (PCR-DGGE). Directly extracted total DNA from environmental samples amplified by PCR with two sets of bacteria-specific primers. The PCR products, which include the V 8 and V 9 high-variable regions respectively, were analyzed by using DGGE. The DGGE profiles not only indicated the existence of higher levels of bacterial diversity, but also showed that the microbial mat and sediments have different dominant bacteria. Furthermore, the bacterial PCR-DGGE displayed clear profiles of bacterial structure selected by the key abiotic factors of the extreme environments, such as temperature and concentration of oxygen.

Fibrosis ; Hematoma, Subdural ; Humans ; Osteogenesis ; Subdural Space ; Tomography, X-Ray Computed

Seven compounds were isolated from fermentation extract of cave-derived Metarhizium anisopliae NHC-M3-2 by silica gel, semi-preparative HPLC and other chromatographic methods. Their structures were elucidated by UV, IR, MS and NMR methods as 2,3-dehydroindigotide G (1), (-)-regiolone (2), naphtho-γ-pyrone (3), indigotide G (4), indigotide B (5) destruxin A (6) and destruxin B (7). Compound 1 is a new glycoside naphthopyranone compound. The anti-hepatitis B virus (HBV) activity of these compounds was evaluated. The EC₅₀ and CC₅₀ of compound 3 against HBV were 4.5 μmol·L^-1 and 92.3 μmol·L^-1, respectively. This is the first report of the antiviral activity of compound 3.

Bridged-Ring Compounds ; poisoning ; Humans ; Male ; Middle Aged ; Poisoning ; therapy ; Treatment Outcome

OBJECTIVETo investigate the immunological effect of PM2.5 on cytokine production in female Wistar rats.

METHODSFemale Wistar rats were given 0.3 mg, 0.75 mg, 2 mg, 5 mg of PM2.5 per 0.5 mL saline, respectively. Saline was used as the negative control. TNF-alpha and IL-6 levels in the branchoalveolar lavage were measured by ELISA, and mRNA expression levels in lung tissue were detected by RT-PCR. Alveolar macrophages were collected for testing phogacytic function.

RESULTSExposure to PM2.5 stimulated TNF-alpha production in a dose-dependent manner (P < 0.05), However, no statistically significant difference was found. No time-dependent change in TNF-a and IL-6 production was found. TNF-alpha and IL-6 mRNA expressions were induced by PM2.5-exposure. The phagocytic rate (PR) was significantly decreased by PM2.5 treatment.

CONCLUSIONPM2.5 exposure increases inflammation response of the lung in a dose-dependent manner. Moreover, tissue injury induced by PM2.5 may be related to altered production of cytokines. PMz2.5 may impair the phagocytic activity of alveolar macrophages.

Animals ; Bronchoalveolar Lavage Fluid ; Cytokines ; biosynthesis ; genetics ; metabolism ; Enzyme-Linked Immunosorbent Assay ; Female ; Macrophages, Alveolar ; metabolism ; Particle Size ; Phagocytosis ; RNA, Messenger ; genetics ; Rats ; Rats, Wistar ; Reverse Transcriptase Polymerase Chain Reaction

The study on the pharmacokinetics of traditional Chinese medicines (TCMs) is a linking science during the modernization of TCMs, and plays an important role in the studies on the complex material base of TCMs, the in vivo process of ingredient/ component and the pharmacokinetics-pharmacodynamics correlation. However, because of the multi-ingredient/component system of TCMs, how to scientifically reveal the pharmacokinetics that is consistent with TCMs' characteristics has long been a hotspot and difficulty for the exploration. The optimal composition structure of the material basis of TCMs shows the best efficacy, while the difference between the multi-ingredient/component composition structures in the efficacy is closely related to their absorption, transport, metabolism and excretion in vivo. In this article, the authors systematically review the study methods for pharmacokinetics of TCMs and their compounds, and explore the pharmacokinetics of TCMs based on the "component structure theory". As a result, the method for integrating TCM component structure and the TCM pharmacokinetics was proposed to be adopted to intensively study the effect of the component structure on the in vivo TCM multi-ingredient/component pharmacokinetic characteristics, in order to promote the TCM modernization and innovation in China.
Animals ; Area Under Curve ; Chemistry, Pharmaceutical ; Humans ; Medicine, Chinese Traditional ; methods ; Pharmacokinetics ; Structure-Activity Relationship