祁州漏芦蜕皮甾酮类化学成分的研究

从祁州漏芦[Rhaponticum uniflorum(L.)DC.]的根中,分离出三个蜕皮甾酮类化合物Ⅰ,Ⅱ,Ⅲ,其中Ⅱ根据UV,IR,MS,¹³CNMR,¹HNMR,¹H-¹HCOSY,¹H-¹HNOESY,¹H-¹³C COSY,及CD谱确定其结构为(20R,22R,24S)-2β,3β,11α,14α,20,22,24-heptahydroxy-5β-cholest-7-en-6-one,为一新化合物,命名为漏芦甾酮(rhaponfisterone)。化合物Ⅰ和Ⅲ分别鉴定为蜕皮甾酮(ecdysterone)和土克甾酮(turkesterone)。     

Serum eosinophilic cationic protein may predict clinical course of wheezing in young children

Thirty eight children aged between 2 and 4 years with three or more episodes of wheezing were studied to evaluate the role of eosinophil inflammation and its relation to persistence of wheezing two years later. Serum eosinophilic cationic protein, total eosinophil count, total IgE, skin prick test, and clinical features were evaluated at visit 1. Two years later at a second clinical evaluation the children were separated into two groups: group 1, those with persistent wheezing (n = 20); group 2, those who had been asymptomatic over the past six months (transient wheezing) (n = 18). Mean (SEM) eosinophilic cationic protein at visit 1 was higher in group 1 than in group 2 (29.63 (5.16) v 14.42 (2.77) micrograms/l), and the probability of continuing wheezing at age 5 years was greater in children with values > or = 20 micrograms/l at visit 1 than in those with lower values (relative risk = 2.88, 95% confidence interval 1.42 to 5.87, p < 0.001). Eosinophil inflammation is present from the beginning of the disease in the children who are going to continue with wheezing at age 5 years. The measurement of serum eosinophilic cationic protein may help in evaluating which wheezing infants are going to continue with asthma in the future.     

Relationship between peptide binding and T cell epitope selection: a study with subtypes of HLA-B27

The effect of HLA-B27 polymorphism on antigen presentation was analysed by comparing the binding of three Epstein-Barr virus-derived peptide epitopes to HLA-B27 subtypes with their immunogenicity and antigenicity in the context of these subtypes. The effect of altering the major anchor residue Arg2 on binding or on recognition by peptide-specific cytotoxic T lymphocytes (CTL) was also examined. The three peptides bound significantly to all the B*2701-B*2706 subtypes. This did not correlate with the peptides being immunogenic or recognized by specific CTL in the context of only particular subtypes. In addition, of the three viral epitopes tested, those that were immunogenic in B*2702- or B*2705-restricted responses bound to these subtypes less efficiently than one peptide that was immunogenic only in the B*2704 context. Thus, among several potentially immunogenic peptides from the same virus, the antiviral response is not necessarily directed against the one that binds best to the restricting subtype. These results indicate that HLA- B27 polymorphism influences antigen presentation in ways other than simply peptide affinity. Synthetic analogues lacking the canonical Arg2 motif of HLA-B27-bound peptides, even when binding much worse to the restricting subtype, were recognized equally by CTL specific for the parental peptide. This indicates that Arg2 is not required to maintain the structure of the epitope. The implications of these results for pathogenetic models of HLA-B27-associated disease are discussed.      

GIR2 Noncompliance with Dosing Instructions and Gastrointestinal Outcomes Associated with Alendronate for Osteoporosis in a Large HMO

Gastroesophageal reflux disease(GERD) usually requires long-term therapy. Treatment strategies include proton pump inhibitor (PPI) or H2receptor-antagonists (H2RA), or prokinetic agents.
OBJECTIVE: A decision tree analytic model for comparing economic and clinical outcomes of GERD treatment strategies using continuous or intermittent therapy with PPI, H2RA, or prokinetic agents was developed.
METHODS: Two decision tree models were constructed. One compared four continuous drug therapies; the other compared four intermittent drug treatments. Base values for heal rates and relapse frequencies were determied by analysis of published clinical data. Costs were drug, physician visit, endoscopy, and surgery costs. Clinical outcomes (percent of patients asymptomatic) and economic outcomes (direct costs) were determined at 12 months.
RESULTS: The four continuous treatment strategies resulted in 99–100% asymptomatic patients at 1 year whereas the four intermittent strategies resulted in 76–80% asymptomatic patients at 1 year. At 1 year, the costs per asymptomatic patient, for continuous treatment strategies, were $1069, $1083, $1164, and $1193 for omeprazole 20 mg daily initially followed by omeprazole 10 mg, omeprazole 20 mg, or ranitidine 300 mg daily, or ranitidine 300 mg daily continously, respectively, and for intermittent strategy, were $1299, $1304, $1353, and $1455 for omeprazole 20 mg, cisapride 40 mg daily followed by omeprazole for failures, ranitidine 300 mg daily followed by omeprzole for failures, and ranitidine 300 mg daily followed by ranitidine 600 mg daily. Sensitivity analyses showed omeprazole cost and healing rate to have the greatest impact on the cost of treatment.
CONCLUSIONS: These GERD decision tree analytic models are useful tools for comparing economic and clinical outcomes of drug treatment strategies over a wide range of costs and clinical efficacies.     

O，O＇－二烷基－O－″－（取代苯乙腈肟）磷酸酯、硫代磷酸酯的合成及对氯硝柳胺的灭螺增效作用

合成了２０个Ｏ，Ｏ’－二烷基－Ｏ－”－（取代苯乙睛肟）磷酸酯、硫代磷酸酯，并分别与杀螺剂氯硝柳胺组成复方，进行室内杀螺试验，初步结果表明，化合物Ｖ４、７、１２、１８有明显杀螺增效作用，其中Ｖ１２可使氯硝柳胺的杀螺效果提高３．８ｌ倍。同时发现化合物Ｖ２、１０、１３单独使用时，也有良好的杀螺作用。     

Assessing Coronary Flow Physiology with Intracoronary Doppler Following Coronary Interventions

Although coronary angiography has been the gold standard for assessing coronary artery stenoses, it yields information primarily about the anatomical severity of coronary artery disease, which frequently does not correlate with its physiological severity. Coronary interventions (PTCA, atherectomy, laser, etc.) are performed primarily to improve coronary flow physiology. Coronary flow physiology may be a more important end point than angiography following coronary interventions that were performed to normalize coronary flow physiology. In addition, the physiological significance of angiographically intermediate stenoses should he assessed before proceeding with catheter-based revascularization. Currently, the Doppler guidewire is available for routine clinical assessment of coronary flow physiology in the Cardiac Catheterization Lab. Several Doppler measurements have been used to assess the physiological effect of a stenosis, including the diastolic-systolic velocity ratio, proximal-distal velocity ratio, coronary flow reserve, continuity equation, and the hyperemic diastolic pressure-flow relationship. The Doppler derived coronary flow reserve correlates highly with stress nuclear perfusion images. These Doppler measurements have been made following PTCA, directional atherectomy, rotational atherectomy, and excimer laser. Following coronary interventions, adverse clinical events may be predicted if there is impaired flow physiology or cyclic flow variations. Many of the Doppler measurements used for assessing the lesion severity remain abnormal following successful coronary interventions for reasons unrelated to the lesion. Conversely, normalization of coronary physiology does not guarantee an adequate anatomical result. Further clinical trials will provide a more complete definition of the exact role for coronary flow velocity assessment following coronary interventions. (J Interven Cardiol 1996;9:163–173)