[Study on effects of baicalin, berberine and Astragalus polysaccharides and their combinative effects on aldose reductase in vitro].

OBJECTIVE: To observe the activities of baicalin, berberine and Astragalus polysaccharides and their combinative effects on aldose reductase (AR) by a screening model of aldose reductase inhibitor (ARI) in vitro. METHODS: The inhibition of AR by baicalin, berberine and Astragalus polysaccharides and positive drug (Epalrestat) in different concentrations were evaluated, and their combinative effects were studied according to orthogonal t design. RESULTS: Baicalin and berberine had remarkable inhibitory effects on AR, the inhibitory rates were (88.4 +/- 7.4)% and (69.0 +/- 9.4)% at the concentration of 300 microg/mL. However, the combinative effect of the inhibition on AR by the two compounds was antagonistic action. Astragalus polysaccharides had no activity of inhibition on AR. CONCLUSION: Baicalin and berberine are the potential AR inhibitors as they can inhibit the activity of AR in vitro.

[Anti-inflammatory and anti-allergic effects of acidic fraction of Pheratima extract in asthma mice induced by ovalbumin].

OBJECTIVE: To explore the effects of acidic fraction of Pheratima extract in an ovalbumin (OVA) induced asthma mouse model, and to provide the experimental evidences for the anti-asthmatic application of Pheratima extract with further purification and development. METHOD: Mice model of allergic asthma was established through the OVA challenge. To investigate the inflammatory cell level and Th1/Th2 levels as well as the therapeutic effects of acidic fraction from Pheratima extract, cell count of bronchoalveolar lavage fluid (BALF) was performed to evaluate the secretion of eosinophils (EOS) cells, and IgE, IL-4, IL-5, IL-13, IFN-y levels were detected by ELISA. RESULT: Compared with control group, the EOS count of BALF in the model group was remarkably increased (P<0.01), and IgE, IL-4, IL-5, IL-13 levels were also increased (P<0.01), while IFN-gamma decreased (P<0.01). Acidic fraction from Pheratima (S) extract and its 30% ethanol washed fraction (S30) significantly inhibited the increase of EOS count (P<0.01), decreased the IgE, IL-4, IL-5, IL-13 levels (P<0.05), and inhibited the decrease of IFN-gamma level (P<0.01). CONCLUSION: The results indicate that inhibition of the EOS secretion and balancing of the altered Th1/Th2 levels may be important mechanisms of Pheratima's therapeutic effect in asthmatic mice model, and S30 is pharmacologically effective as evaluated with the above mentioned parameters, as a representative fraction of the Pheratima extract.

In situ STM studies of electrochemical growth of nanostructured Ni films and their anomalous IR properties.

We have extended the study of anomalous IR properties, which were initially discovered on nanostructured films of platinum group metals and alloys, to nanostructured films of nickel, a member of the iron group triad, and broadened the fundamental knowledge on this subject. Nanostructured thin films of nickel supported on glassy carbon [nm-Ni/GC(n)] were prepared by electrochemical deposition under cyclic voltammetric conditions, and the thickness of films was altered systematically by varying the number (n) of potential cycling within a defined potential range for electrodeposition. Electrochemical in situ scanning tunneling microscopy (STM) was employed to monitor the electrochemical growth of nanostructured Ni films. These in situ STM images illustrated that, along the increase of the film thickness, Ni films have undergone a transformation from layer structure to island structure and finally to lumpish arris structure. Investigations by in situ FTIR spectroscopy employing adsorbed CO as the probe revealed that these nanostructures of Ni films yield abnormal IR features, Fano-like IR features, and normal IR features, respectively. The IR bands of CO adsorbed on Ni thin films of a layer structure were inverted in their direction and enhanced in their intensity up to 15.5 times on an nm-Ni/GC(4) electrode. The Fano-like IR features, which are defined as a bipolar band with its negative-going peak on the low wavenumber side and its positive-going peak on the high wavenumber side, are observed for the first time on Ni thin films of an island nanostructure, i.e., at the nm-Ni/GC(16) electrode. IR features changed to normal absorption in CO adsorbed on the nm-Ni/GC(25) electrode, i.e., that with lumpish arris nanostructured Ni film of a larger thickness.