ABSTRACT
Objective To establish an HPLC method for determination of 2,3,5,4’-tetrahydroxystibene-2-O-β-D-glucoside(SBGC)and hyperin in the effective fraction of Jiangzhining. Methods HPLC analysis was performed on a C18 column(4.6 mm×250 mm,5 μm),with acetonitrile-0.1% methanoic acid water solution(15.5: 84.5)serving as the mobile phase. The flow rate was 1.0 mL·min-1 ,the wavelength was 340 nm,and the injection volume was 20 μL. Results The calibration curve was linear for SBGC in the range of 24-120 μg·mL-1(r = 0.999 8)and for hyperin in the range of 2.4-12.0 μg·mL-1(r= 0.999 6),respectively.Their average recoveries were 100.07% and 100.14%,respectively.The contents of SBGC and hyperin were 2.26% and 0.23%,respectively Conclusion The method is convenient,precise and reliable for determination of the content of SBGC and hyperin in the effective fraction of Jiangzhining.
ABSTRACT
Objective:To analyze the DKK1 expression in breast cancer cell line MDA-MB-231 and examine its effect on the mi-gration and invasion of the cell line. Method:DKK1 expression in the breast cancer tissues was detected immunohistochemically, and DKK1 distribution in the breast cancer cells was observed using immunofluorescence. Western blot was used to investigate DKK1 ex-pression in breast cancer tissues and their matched normal breast tissues. A eukaryotic expression vector of DKK1 was constructed and transfected into MDA231 cell line. The migration and invasion ability of the cells were observed through scratch assay and Boyden chamber, respectively. Results: Immunohistochemical staining showed that DKK1 in the transfected lymph node or non-lymph node was highly expressed in the breast cancer tissues (P<0.05). The positive DKK1 expression in lymph node metastasis was less signifi-cant than those in non-lymph node transfected cells. Immunofluorescence localization results showed a remarkable bright red granular fluorescence in the cytoplasm of the MDA231 cell line. Western blot analysis showed that the DKK1 protein expression in carcinoma tissues were obviously higher than that in matched normal breast tissues. The migration and invasion ability of DKK1-overexpressed MDA231 cell was lower than those of MDA231 cell transfected with pCMV-Tag-2b empty vector. Conclusion:Negative correlation was found between DKK1 expression and the migration and invasion ability in breast cancer cells.
ABSTRACT
Objective: To investigate the plasma effective constituents of Beagle dogs after oral administration with the extract of Polygonum multiflorum thunb. Methods: Based on the established HPLC fingerprints, comparison was carried out among the blank plasma, plasma containing drug, Polygonum multiflorum thunb. Simultaneously, the retention time and UV spectrogram were utilized as index to evaluate the relation among the fingerprint peaks so as to confirm the original of peaks. Result: Fourteen components were detected after oral administration. Four of them were the original components existed in Polygonum multiflorum thunb and ten of them were metabolites. Conclusion: Studying on the constituents and metabolites in plasma is useful to research the effective substances of Chinese medicine of Polygonum multiflorum thunb in vivo.