Angelica Polysaccharide Resists Platelets Apoptosis Induced by LY294002 / 中国实验血液学杂志

OBJECTIVE@#To investigate the anti-apoptotic effect of Angelica polysaccharide (APS) on cryopreservated platelets and its mechanism.@*METHODS@#The platelets were divided into 4 group: control group(4 ℃ stored platelets),APS group (APS-treated platelets stored at 4 ℃), LY294002 group (LY294002-treated platelets stored at 4 ℃) and LY294002+APS group(LY294002+APS treated platelets stored at 4 ℃ ). The expression of platelet membrane glycoprotein CD41 and CD61, as well as the platelet apoptotic rate, Caspase 3 expression and mitochondrial membrane potential (MMP) were detected by flow cytometry; the anti-apoptotic mechanism of APS by PI3K /AKT signaling pathway was analyzed by Western blot assay.@*RESULTS@#The apoptosis rate of platelets in LY294002 group obviously increased, the activity of CD41 and CD61 expression gradually decreased along with the enhancement of LY294002 concentrations (r=-0.953)； compared with control group, the apoptosis rate of platelets in LY294002 group was enhanced significantly(P<0.05)，while the apoptosis rate of platelets in LY294002+APS group significantly was reduced(P<0.05) as compare with LY294002 group, which suggest that APS has an anti-apoptotic effect on the cryopreserved platelets. APS decreased the expression of Caspase-3 and inhibited the reduction of mitochondrial membrane potential induced by LY294002, moreover, APS could increase the activation of PI3K /AKT pathway in Plt.@*CONCLUSION@#APS has an anti-apoptotic effect on the cryopreserved platelets through activating the PI3K /AKT pathway, decreasing the expression of apoptosis protease Caspase-3 and inhibiting the reduction of MMP.

Expression of hypoxia-inducible factor-1αand erythropoietin at corneal neovascularization in rats / 国际眼科杂志(Guoji Yanke Zazhi)

AlM: To describe the expression of hypoxia-inducible factor-1α ( HlF-1α) and erythropoietin ( EPO ) in rats' corneal and evaluate its potential effect on corneal neovascularization ( CNV) growth. METHODS:The young SD rats (3mo) was chosen and randomly divided into 2 groups, which were experimental group and normal control group. CNV model was established by alkali burn, and the length and area of CNV was observed everyday after operation by slit lamp. After that, the expression of HlF-1α and EPO was measured by SABC and RT-PCR methods at 1, 3, 5, 7, and 14d after alkali burn. The data was analyzed by SPSS 20. 0. RESULTS:The area of CNV was increasing at 1, 3, 5, 7, and 14d after alkali burn, and the peak point appear at 7d. The growth speed was decreased after 14d. SABC method told us that no HlF-1αand very tiny amount EPO was detected at normal rats' corneal. The expression of the two factors increased at 1d after alkali burn in corneal epithelium and endoderm. The results of RT - PCR showed that a few amounts of HlF-1α and EPO mRNA were detected at normal group. The expression of the two factors was increased at 3d after alkali burn, and the peak value was found at 7d, however, it was decreased at 14d. Statistical difference was found at different time (P CONCLUSlON: HlF- 1α and EPO is closely related to CNV.