ABSTRACT
AIM:To observe the influence of erythropoietin (EPO) on eryptosis and production of reactive oxygen species (ROS) in erythrocytes under stimulation of hydrogen peroxide (H2O2),.and to explore its related mecha-nism. METHODS:The erythrocyte suspension (1%) was cultured in vitro and divided into 3 groups:control group (C group,the culture medium was PBS),H2O2group (H group,the culture medium was PBS containing H2O2at final con-centration of 100 μmol/L) and EPO group (E group,the culture medium was PBS containing H2O2at final concentration of 100 μmol/L and EPO at final concentration of 2×104U/L). The erythrocytes were collected at 24 h and 60 h. The eryptosis was detected by flow cytometry with Annexin V staining. The production of ROS and intracellular calcium ion con-centration (Ca2+]i) were also analyzed by flow cytometry. RESULTS:The eryptosis in C group was increased as the in-cubating time extended. The eryptosis in H group was higher than that in C group (P<0.01),while that in E group was lower than that in H group(P<0.01). Meanwhile,ROS production andCa2+]iwere higher in H group than those in C group (P<0.01), but those were lower in E group than those in H group (P<0.05 or P<0.01). CONCLUSION:EPO inhibits eryptosis induced by H2O2and its mechanism may be related to antioxidant effect and change of Ca2+]i.
ABSTRACT
<p><b>OBJECTIVE</b>To observe effect of acupuncture on serum macrophage inflammatory protein-2 (MIP-2) and MIP-2 mRNA expressions in isolated Fei and Dachang of severe acute pancreatitis (SAP) induced acute lung injury (ALI) rats in the acute phase.</p><p><b>METHODS</b>Forty male Wistar rats were randomly divided into four groups, i.e., the sham-operation group, the SAP group, the acupuncture treatment group, and the acupuncture control group, 10 in each group. The SAP model was induced by retrograde infusion of 3.5% sodium taurocholate into the pancreatobiliary duct. Under the guidance of "Fei and Dachang exterior-inferiorly related", points were acupunctured along Fei, Dachang, and Pi channels, as well as those points on the back of rats in the acupuncture treatment group 0.5 h after modeling. Besides, points were acupunctured along Fei and Pi channels, as well as those points on the back of rats in the acupuncture control group 0.5 h after modeling. Serum levels of tumor necrosis factor alpha (TNF-alpha) and nitric oxide (NO), and MIP-2 expressions were examined 6 h after modeling. Expressions of MIP-2 mRNA in isolated lung and large intestine tissues were detected by reverse transcription PCR.</p><p><b>RESULTS</b>Compared with the sham-operation group, serum levels of TNF-alpha and NO, and expressions of MIP-2 and MIP-2 mRNA in isolated lung and large intestine tissues were significantly higher in the SAP group (P < 0.05). Each index was lower in the acupuncture treatment group than in the SAP group and the acupuncture control group (P < 0.05). Besides, the serum level of MIP-2 and the MIP-2 mRNA expression in isolated lung and large intestine tissues were positively correlated in all groups except the sham-operation group (P < 0.05).</p><p><b>CONCLUSIONS</b>Under the guidance of "Fei and Dachang exterior-inferiorly related", acupuncture could remarkably reduce the severity of SAP induced ALI rats in the acute phase. Its mechanism might be related to suppressing over-expressions of MIP-2 mRNA in isolated lung and large intestine tissues, and lowering the serum MIP-2 expression level.</p>