藏药三果汤散抗氧化有效成分的薄层色谱-生物自显影及HPLC指纹图谱

目的:初步建立藏药三果汤教的HPLC指纹图谱,研究藏药三果汤散的抗氧化活性,初步筛选出三果汤散中抗氧化有效成分.方法:采用薄层色谱-生物自显影技术和1,1-二苯基-2-三硝基苯肼(DPPH)分光光度法对不同来源的三果汤散、单味药对照药材及其中单体成分没食子酸、没食子酸乙酯、鞣花酸、柯里拉京进行抗氧化作用初步测定,并采用高效液相色谱法初步建立了三果汤散的指纹图谱.结果:不同来源的三果汤散的抗氧化作用差异不大,所含化学成分以没食子酸抗氧化作用最强,揭示没食子酸可能是三果汤散抗氧化的主要有效成分之一.结论:该方法准确、简便可行,为进一步探索三果汤散抗氧化有效成分提供了科学依据.     

Coronary arteriographic findings in a case of primary angiosarcoma of the heart

A case of primary angiosarcoma of the heart diagnosed duringlife is presented. Selective coronary arteriography providedthe clue for the correct pre-operative identification of thetumor, showing angiomatous dilatations over the area suppliedby the right coronary artery. A small left-to-right shunt wasdetected by oximetry at the atrioventricular level, furtherconfirming the angiomatous nature of the tumor.     

Low-dose aspirin in patients recovering from myocardial infarction. Evidence for a selective inhibition of thromboxane-related platelet function

The adequacy, selectivity and long-term persistence of inhibitionin cyclooxygenase-dependent platelet function by a daily low-dose(0.45 mg kg^–1 day^–1) aspirin treatment have beenevaluated in 15 patients after a recent (less than 17 days)acute myocardial infarction. Serum thromboxane (TX) B₂, an indexof platelet TXA₂ production, was decreased by 94–98% (P<0.001)by aspirin, while urinary excretion of 6-keto-prostaglandinF^la, as an index of extraplatelet cyclooxygenase activity, remainedunchanged. Compared to placebo, aspirin induced a persistentincrease in bleeding time (% difference 45.6±21.4, mean± SD) and a decrease in platelet aggregation by ADP,epinephrine, collagen and arachidonic acid. No tendency towardsan attenuation of the effects was apparent for the period ofaspirin administration (4 weeks). Aspirin 0.45 mg kg^–1 day^–1 is adequate and selectivein the long-term inhibition of TX-related platelet functionin patients after acute myocardial infarction. The clinicaleffectiveness of such a regimen remains to be proven in clinicaltrials.     

T cell-mediated immunity in murine malaria. II. Induction of protective immunity to P. chabaudi by antigen fed macrophages and antigen educated lymphocytes

We previously described assay systems for generating antigen specific proliferating T cells to P. chabaudi antigens. In the present study we examine whether the various sensitization approaches confer immunity against a cloned virulent strain IP-PCI of P. chabaudi. We present data indicating that effective specific protective immunity can be induced through P. chabaudi antigen fed macrophages and antigen educated spleen cells (initiator lymphocytes). The expression of this protective immunity is proposed to depend on (a) antigen presentation and/or accessory function of macrophages and (b) the subsequent activation of T cell functions related to protection. Indeed analysis of different macrophage populations revealed a correlation between the expression of Ia molecules and IL-1 secretion with their capacity to induce antigen specific T cells in vivo and subsequent protective immune mechanisms. Thus these results emphasize the critical functions of accessory cells in determining the outcome of malaria infections.