Feasibility of monitoring clopidogrel resistance with flow cytometric analysis of platelet vasodilator stimulated phosphoprotein phosphorylation / 南方医科大学学报

<p><b>OBJECTIVE</b>To evaluate the feasibility of monitoring clopidogrel resistance with flow cytometric analysis of platelet vasodilator stimulated phosphoprotein (VASP) phosphorylation.</p><p><b>METHODS</b>Twenty patients with coronary heart disease (CHD) and 17 healthy volunteers were examined for platelet aggregation rate and phosphorylation of VASP (calculated as platelet reactivity index, PRI) using traditional optical nephelometry and flow cytometry before and after concurrent therapy of clopidogrel and aspirin.</p><p><b>RESULTS</b>No significant differences were found in PRI between CHD group and healthy control group [(89.45∓5.22)% vs (86.58∓4.35)%] before treatment. The PRI in CHD group was significantly lowered after treatment to (67.66∓19.77)% (P<0.05). Clopidogrel resistance was found in 6 (30%) cases in CHD group by flow cytometric analysis, which showed a higher sensitivity than optical nephelometry (10%).</p><p><b>CONCLUSION</b>Flow cytometric analysis of VASP phosphorylation is a more reliable test to specifically evaluate clopidogrel resistance.</p>

Expressions of programmed death 1 and programmed death ligand 1 in rat model of acute liver failure / 中华传染病杂志

Objective To study the expressions of programmed death 1 (PD-1) and programmed death ligand 1 (PD-L1) in liver injury of acute liver failure (ALF) in rats and the role of PD-1/ PD-L1 in liver inflammatory injury. Methods SD rats were divided into two groups: 6 in normal group and 30 in ALF model group. The ALF models in rats were induced by D-galactosamine (D-Gal). The sera and hepatic tissue samples were collected at 12, 24, 48, 72 and 120 hours after D-Gal injection. Expressions of PD-1 mRNA and PD-L1 mRNA in hepatic tissue samples were detected by reverse transcription-polymerase chain reaction (RT-PCR). Comparison of measurement data between groups was done by t test. Correlation test was performed using Pearson linear correlation analysis. Results The levels of alanine animotransferase (ALT) and aspartate animotransferase (AST) at 12 h of D-Gal injection were (217. 3±33. 7) U/L and (397. 2± 101.3) U/L, respectively,which were both significantly higher than those in normal group [(30. 5 ±3. 1) U/L and (78. 6±4.2) U/L, respectively; t=-8. 921 and -6. 121, respectively; both P＜0.01] and peaked at 48 h.The expression of PD-1 mRNA in model group at 12 h (0. 385±0. 074) was significantly higher than that in normal group (0. 097±0.009) (t= -7. 725, P＜0.01) , and peaked at 48 h (0. 927±0. 132),then decreased obviously at 72 h. The expression of PD-L1 mRNA in the liver tissue of normal rats was very little, while that in model group was increased gradually over time, then peaked at 48 h (0. 593±0. 105; t =- 10. 076, P＜0. 01). The expressions of PD-1 and PD-L1 were positively correlated with ALT level (r=0. 807 and 0. 792, respectively; both P＜0. 01). Conclusion The expressions of PD-1/PD-L1 may play an important role in liver inflammatory injury in rat model of acute liver failure.

The investigation of the influence of age on liver histopathological feature of patients with chronic hepatitis B / 中国医师杂志

Objective To investigate the influence of age on liver histopathological feature of patients infected with chronic hepatitis B. Methods Liver biopsies were performed on 114 patients with chronic hepatitis B. The biochemical tests were measured by routine automated techniques. Serum hepatitis markers including HBsAg, anti-HBs, HBeAg, anti-HBe, and anti-HBc were assayed by using a microparticle enzyme linked immunosorbent assay. HBV-DNA was measured with quantitative polymerase chain reaction assay. The grades of liver necrosis/inflammation and fibrosis were compared between four groups with different age: younger than 20years, 20 ～ 30, 31 ～40, and older than 40 years. Results All 114 patients had liver histological changes with different degree. 75.4 percent (89/114) of cases had 2/over 2 grades of liver necrosis/inflammation, and 47.4 percent (54/114) of cases had 2/over 2 stages of liver fibrosis.There was no significant relation between the level of ALT and age or between the level of ALT and the grades of liver necrosis/inflammation and fibrosis( P ＞0. 05 ). The significant difference in degrees of liver inflammation and fibrosis was found among three age groups ( x2 = 30. 86, P ＜ 0. 01; x2 = 21.17; P ＜0.05 ). The grades of 1 iver inflammation and fibrosis increased with the increased age of the patients. Conclusion These results suggested that age was an independent factor for the disease progression. It was very important to undertake liver biopsy for patients with CHB more than 30 years to reveal the liver histopathological characteristics and guide the treatment.