[The correlation between metabolic parameters in (18)F-FDG PET-CT and solid and micropapillary histological subtypes in lung adenocarcinoma]

Objective: Solid and micropapillary pattern are highly invasive histologic subtypes in lung adenocarcinoma and are associated with poor prognosis while the biopsy sample is not enough for the accurate histological diagnosis. This study aims to assess the correlation and predictive efficacy between metabolic parameters in (18)F-fluorodeoxy glucose positron emission tomography/computed tomography ((18)F-FDG PET-CT), including the maximum SUV (SUV(max)), metabolic tumor volume (MTV), total lesion glycolysis (TLG) and solid and micropapillary histological subtypes in lung adenocarcinoma. Methods: A total of 145 resected lung adenocarcinomas were included. The clinical data and preoperative (18)F-FDG PET-CT data were retrospectively analyzed. Mann-Whitney U test was used for the comparison of the metabolic parameters between solid and micropapillary subtype group and other subtypes group. Receiver operating characteristic (ROC) curve and areas under curve (AUC) were used for evaluating the prediction efficacy of metabolic parameters for solid or micropapillary patterns. Univariate and multivariate analyses were conducted to determine the prediction factors of the presence of solid or micropapillary subtypes. Results: Median SUV(max) and TLG in solid and papillary predominant subtypes group (15.07 and 34.98, respectively) were significantly higher than those in other subtypes predominant group (6.03 and 10.16, respectively, P<0.05). ROC curve revealed that SUV(max) and TLG had good efficacy for prediction of solid and micropapillary predominant subtypes [AUC=0.811(95% CI: 0.715~0.907) and 0.725(95% CI: 0.610~0.840), P<0.05]. Median SUV(max) and TLG in lung adenocarcinoma with the solid or micropapillary patterns (11.58 and 22.81, respectively) were significantly higher than those in tumors without solid and micropapillary patterns (4.27 and 6.33, respectively, P<0.05). ROC curve revealed that SUV(max) and TLG had good efficacy for predicting the presence of solid or micropapillary patterns [AUC=0.757(95% CI: 0.679~0.834) and 0.681(95% CI: 0.595~0.768), P<0.005]. Multivariate logistic analysis showed that the clinical stage (Stage Ⅲ-Ⅳ), SUV(max) ≥10.27 and TLG≥7.12 were the independent predictive factors of the presence of solid or micropapillary patterns (P<0.05). Conclusions: Preoperative SUV(max) and TLG of lung adenocarcinoma have good prediction efficacy for the presence of solid or micropapillary patterns, especially for the solid and micropapillary predominant subtypes and are independent factors of the presence of solid or micropapillary patterns.

Effect of menopausal symptom treatment options on palpitations: a systematic review

This systematic review provides an overview of the effects of menopausal symptom treatment options on palpitations, defined as feelings of missed or exaggerated heart beats, reported by perimenopausal and postmenopausal women. Guided by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines, searches were conducted in PubMed, CINAHL and PsycINFO to identify articles meeting pre-specified inclusion criteria. Of 670 unique articles identified, 37 were included in the review. Treatments included drug therapies and non-drug therapies. Palpitations were studied as an outcome in 89% of articles and as an adverse effect in 11%. Articles provided mostly level II/III evidence due to their design and/or small sample sizes. Based on available evidence, no therapies can be fully recommended for clinical practice. Only some hormonal agents (e.g. estradiol) can be recommended with caution based on some positive evidence for reducing palpitation prevalence or severity. However, other drug therapies (e.g. moxonidine, atenolol), dietary supplementary treatments (e.g. isoflavones, Rheum rhaponticum, sage), cognitive-behavioral intervention and auricular acupressure cannot be recommended given the existing evidence. Additional well-designed randomized controlled treatment trials focusing on palpitations during the menopause transition as an inclusion criteria and outcome are needed to advance the field.

Review and Prospect of Pathological Features of Corona Virus Disease

Abstract

Since 2003, coronavirus has caused multiple major public health events that resulted in global epidemics, such as severe acute respiratory syndrome （SARS）, Middle East respiratory syndrome （MERS） and corona virus disease 2019 （COVID-19）. Especially since COVID-19 outbroke in Wuhan, Hubei, in December 2019, coronavirus has had a significant impact on people's health and lives. But so far, the pathological diagnosis of COVID-19 has been relatively deficient： it is still confined to the pathological findings of punctured organs, and the majority of medical workers have poor awareness of its pathological characteristics. The COVID-19, as same as SARS and MERS, is caused by coronaviruses and can cause viral pneumonia. They have certain similarities. This article comprehensively reviews the pathological features observed in the autopsies of the aforementioned three diseases, in order to provide reference to the analysis of pathological changes of COVID-19.

[Current epidemiological status of causes of disease among patients with liver disease hospitalized in Department of Infectious Diseases in a large general hospital within the past 20 years]

Objective: To investigate the causes of disease among patients with liver disease hospitalized in Department of Infectious Diseases in our hospital and the changes in such causes within the past 20 years. Methods: A retrospective analysis was performed for the clinical data of 7570 patients who were admitted to our hospital from January 1995 to December 2015. The chi-square test was used for the statistical analysis of constituent ratio. Results: Of all 7570 patients with liver disease, 4930 (65.13%) had viral hepatitis, 332 (4.39%) had immune disease, 215 (2.84%) had drug-induced liver injury, 192 (2.54%) had fatty liver disease, 88 (1.16%) had schistosome-induced liver disease, 160 (2.11%) had inherited metabolic diseases, and 20 (0.13%) had vascular disease; 689 (9.1%) still had no clear cause of disease at discharge. The proportion of patients with viral hepatitis was 77.61% in the first 10 years and 59.19% in the last 10 years (P < 0.01). As for liver disease caused by hepatotropic virus, there were significant increases in the proportion of patients with hepatitis C or hepatitis E from the first to the last 10 years (hepatitis C: 2.24% vs 15.56%, P < 0.01; hepatitis E: 18.61% vs 23.07%, P < 0.05), while there were significant reductions in the proportion of patients with hepatitis B (68.14% vs 60.01%, P < 0.05) or hepatitis A (10.7% vs 1.36%, P < 0.05). The proportion of patients with immune diseases was 0.82% in the first 10 years and 6.08% in the last 10 years (P < 0.01). There were also certain changes in the proportion of patients with liver disease caused by other reasons. Conclusion: There is a large proportion of patients with viral hepatitis among patients with liver disease hospitalized in Department of Infectious Diseases in a large general hospital, especially hepatitis B and E caused by hepatotropic virus. There is a certain change in the epidemiology of liver disease within the past 20 years, with a reduction in the proportion of patients with viral hepatitis and an increase in the proportion of patients with non-infectious liver diseases. There is a large proportion of patients with unknown causes of liver disease.

[Predictive value of serum glycosylated hemoglobin for the onset of nonalcoholic fatty liver disease]

Objective: To discuss the affect of glycosylated hemoglobin (HbA1c) level for the onset of nonalcoholic fatty liver disease (NAFLD) in cohort population. Methods: An epidemiological survey of the relationship between HbA1c and NAFLD conducted in 2012 was based at cohort baseline, and three follow-up sessions conducted in 2013, 2014 and 2015. In total 2 811 subjects were included in the study after exclusion of NAFLD patients at baseline and those who lost their lives due to relocation, and death. The Cox proportional hazard model was used to analyze the relationship between glycosylated hemoglobin and other risk factors of NAFLD. Continuous variables were compared using the t-test or the Mann-Whitney test. χ (2)-test was used for the measurement of categorical data. Results: A total of 2 811 subjects with mean age of 59 (58.2±9.8) years old, including 1 664 males and 1 147 females. Age, waist circumference, body mass index, systolic blood pressure, γ-glutamyltransferase and fasting blood glucose level of HbA1c abnormal group were higher than normal group. The incidence of NAFLD in the abnormal HbA1c level group (25.4%) was higher than normal group (14.9 %), and diastolic blood pressure, high-density lipoprotein cholesterol was lower than normal group and the differences were statistically significant. During the three follow-up intervals, there were 440 new cases of NAFLD, consisting 285 males and 155 females with cumulative incidence of 15.7% (440/2 811). Multivariate Cox regression analysis showed that patients with elevated HbA1c had a higher risk of developing NAFLD (HR 1.796; 95% CI 1.335~2.418; P < 0.01), and the increased HbA1c level after adjustment for gender, age, and metabolic syndrome-related factors remained an independent risk factors for NAFLD (HR 1.580; 95.0% CI 1.161-2.152; P < 0.01). Conclusion: An elevated HbA1c levels have a positive predictive value for the onset of NAFLD.

[Effect of neuroglobin on oxygen-glucose deprivation and reoxygenation induced autophagy in a human neuroblastoma cell line]

Objective: To investigate the effect of neuroglobin on oxygen-glucose deprivation and reoxygenation (OGD/R) induced autophagy in a human neuroblastoma cell line (SH-SY5Y). Methods: SH-SY5Y cells were transfected with plasmids (or vector) to establish a stable cell line of NGB overexpression (OE). After treated with OGD/R, cells were collected for the analyses of mRNA (Atg5, Atg7, BECN1 and FUNDC1) and protein levels of LC3. Furthermore, mitochondrial and cytosolic fractions were isolated for protein levels of PINK1 and Parkin. Results: Treatment of OGD/R significantly increased the levels of mRNA of Atg5, Atg7, BECN1 and FUNDC1 (peak levels were 4.90±0.71, 6.72±0.75, 2.71±0.39 and 3.96±0.78 fold, all P<0.05). The protein level of Parkin increased in mitochondria and decreased in cytoplasm after the treatment. Compared with the vector group, Ngb OE group showed a significant higher level of FUNDC1 mRNA (3.96±0.78 versus 6.86±0.63 fold, P<0.05), while Atg5, Atg7 and BECN1 mRNA levels showed no significant difference. Moreover, the mitochondrial or cytosolic protein levels of PINK1 or Parkin showed no significant difference between Ngb OE and vector group. Conclusions: Overexpression of Ngb can not affect autophagy or mitohpagy in OGD/R treated SH-SY5Y cells. Overexpression of Ngb can increase the mRNA level of FUNDC1 and the mechanism needs further study.

[Effect of umbilical cord mesenchymal stem cell transplantation on immune function and prognosis of patients with decompensated hepatitis B cirrhosis]

Objective: To investigate the effect of human umbilical cord mesenchymal stem cells (hUCMSCs) on the immune function and prognosis of patients with decompensated hepatitis B cirrhosis. Methods: A total of 65 patients with decompensated hepatitis B cirrhosis were divided into observation group and control group. The patients in the observation group were given intervention (via the proper hepatic artery or the portal vein) and intravenous infusion of 4×10⁸ hUCMSCs in two doses, as well as the same basic treatment as in the control group. The patients in the control group were given conventional medical treatment. ELISA as used to measure the serum levels of interleukin-6 (IL-6), tumor necrosis factor-α (TNFα), interleukin-10 (IL-10), and transforming growth factor-β (TGFβ) in the observation group before surgery and at 1 week after surgery, as well as the serum levels of IL-6, TNFα, IL-10, and TGFβ in the control group on admission and at 1 week after admission. Flow cytometry was used to measure the percentage of lymphocyte subsets in the observation group before surgery and at 1 week after surgery, as well as that in the control group on admission and at 1 week after admission. In addition, the patients' prognosis and major complications during hospitalization were observed in both groups, and the patients were followed up for 24 weeks to record the number of deaths. The t-test was used for comparison of continuous data, and the chi-square test was used for comparison of categorical data which were expressed as percentages. Results: At 1 week after the transplantation of hUCMSCs, compared with the control group, the observation group had significant reductions in the serum levels of IL-6 and TNFα and significant increases in the serum levels of IL-10 and TGFβ (all P < 0.001), as well as significant increases in the percentages of T4 cells and Treg cells and significant reductions in the percentages of T8 cells and B cells (all P < 0.05). There were no significant differences in the changes in T3 cells and natural killer cells between the two groups (P > 0.05). Compared with the control group, the observation group had a significantly lower probability of progression to liver failure (6.45% vs 14.71%, P = 0.017). Conclusion: In the treatment of patients with decompensated hepatitis B cirrhosis, transplantation of UCMSCs can inhibit the proliferation of T cells and B cells and the differentiation of T8 cells, upregulate Treg cells, promote the secretion of immunosuppressive cytokines, and reduce the production of inflammatory cytokines. Therefore, it can alleviate liver inflammatory response and liver cell damage and reduce the probability of hepatic failure.

[Effect of obstructive sleep apnea hypoxia on learning memory capacity after cerebral ischemia-reperfusion in rats]

OBJECTIVE

To investigate the effect of obstructive sleep apnea hypoxia on learning memory capacity in rat after ischemia.

METHODS

Eighty healthy male wister rats were randomly divided into: sham operation group (SO group, n=20), merely ischemia group (I/R group, n=20), and obstructive sleep apnea hypoxia for 7 days ischemia group (IH7+ I/R group, n=20), obstructive sleep apnea hypoxia for 21 days ischemia group (IH21+ I/R group, n=20). Obstructive sleep apnea hypoxia ischemia groups were respectively given obstructive sleep apnea hypoxia for 7 days and 21 days. Ischemia animals were prepared cerebral ischemia-reperfusion model by improved pulsinelli four vessels block (4-VO), the morphological changes of hippocampus nerve cells of rat brain were detected with HE, neuron pathology in hippocampal regin was observed using electron microscope, and learning memory capacity of rats were assessed by the Morris water maze test.

RESULTS

Compared with the SO group, the I/R group demonstrated shortened escaping latency, increased frequency of crossing the platform in the water maze test, decreased survival rate of neurons, and increased apoptotic cells and ultrastructure damages(P<0.05). Compared with the I/R group, obstructive sleep apnea hypoxia ischemia groups showed shortened escaping latency, increased frequency of crossing the platform, decreased survival rate of neurons, and increased apoptotic cells and ultrastructure damages(P<0.05), especially in the IH21+ I/R group(P<0.05).

CONCLUSIONS

Obstructive sleep apnea hypoxia can increase the damage of learning memory capacity. This damage is related to hippocampus nerve loss and ultrastructure injury from obstructive sleep apnea hypoxia.

[Clinical characteristics and prognosis in 12 patients with adult T cell leukemia/lymphoma confirmed by HTLV-1 provirus gene detection]

Objective: To analyze the clinical characteristics and prognosis of adult T cell leukemia/lymphoma (ATLL). Methods: Peripheral blood samples from patients who were suspected as ATLL from March, 2013 to July, 2015, were collected for HTLV-1 provirus genes detection in genomic DNA extraction by PCR. Cases showing positive results were confirmed as ATLL. Clinical and laboratory characteristics, therapeutic outcomes and survival evaluation were collected. Results: 12 out of 23 suspected patients were confirmedly diagnosed as ATLL through HTLV-1 provirus genes detection by PCR. Eight patients were male and four patients were female. Median age was 51 (range 28-66) years old. All of those patients came from coastal cities of Fujian province where a HTLV-1 epidemic area locates. In the subtype classification of these 12 ATLL, 11 patients were classified as acute type and one case as lymphoma type ATLL. As one of the clinical characteristics of ATLL, ' flower cells ', with typical or atypical morphology had been observed in a high rate (81.8%). Clinical symptom such as hepatomegaly, splenomegaly and lymphadenectasis were detected in most of patients, and hypercalcemia and elevated LDH were also noted commonly. The ATLL cells immunophenotype were typical, and the major subtype was CD4+ CD8- type. Confection of hepatitis B virus was detected in a high rate (54.5%). Ten patients received chemotherapy, and 2 cases in complete remission after chemotherapy received allogeneic hematopoietic stem cell transplantation. At the end of the follow-up, 7 cases died, 4 cases survived, 1 case was lost, and the median survival was 2.8 (0.9-10.8) months. We found a case had HTLV-1 provirus negative after transplantation. Conclusion: In the coastal area of Fujian Province, ATLL is not rare. Characteristics of those ATLL are typical. But prognosis is still unsatisfactory.

[Influences of DNA methylation upon neuroglobin sustained expression in oxygen- glucose deprivation model]

Objective: To investigate the influences of genomic DNA methylation upon neuroglobin sustained expression in oxygen- glucose deprivation model. Methods: With A549 cell strain as the research object, the control group were cultivated in the complete medium containing 10 μmol/L of 5-azacytidine for 4 days, and the control group was cultivated in the complete medium for 4 days.Then carried out oxygen glucose deprivation treatment for 4 h.Detecting neuroglobin expression, DNA methyltransferase expression, cell inhibition ratio and DNA methylation level at different time points. Results: DNA methylation level of the experimental group declined apparently[6 h : (1.0±0.0) vs (2.1±0.3); 12 h: ( 0.9±0.0) vs (1.4±0.0); 24 h: (0.9±0.0) vs (2.6±0.2); 36 h: (0.9±0.0) vs (2.9±0.1)], neuroglobin expression of the experimental group continued and was obviously higher than that of the control group at the same time point[NGB-PCR: 6 h: (3.3±1.1) vs (0.4±0.1); 12 h: (3.2±0.8) vs (0.1±0.1); 24 h: (4.6±0.6) vs (0.2±0.0); 36 h : (5.1±0.3) vs (0.1±0.1)], while the Cell inhibition ratio of the experimental group was obviously lower than that of the control group at the same time point[(6 h: (10.4±0.5) vs (14.1±0.7); 12 h: (22.0±1.3) vs (35.1±0.5); 24 h: (25.7±1.0) vs (40.6±1.3); 36 h: (30.0±0.8) vs (44.4±0.7)], differences had statistical significance (P<0.05).mRNA expression of three methyltransferases of the experimental group was higher than that of the control group at different time points, where, DNMT1 and DNMT3B showed great differences (P<0.05), while differences in DNMT3A of two groups had no statistical significance (P>0.05). Conclusions: In the OGD/R model of A549 cell strain, genomic DNA methylation resulted in unsustained expression of neuroglobin, but neuroglobin expression increased after demethylation inhibitor was used.

[Expression of mTOR/autophagy pathway in the hippocampus following cerebral ischemia/reperfusion injure in intermittent hypoxia rats]

Objective: To compare the changes in the expression of mTOR and beclin1 in the hippocampus of normal rats and intermittent hypoxia rats with cerebral ischemia/reperfusion, so as to explore the roles of mTOR/autophagy pathway in global cerebral ischemia/reperfusion injure aggravated by intermittent hypoxia. Methods: One hundred healthy male Wistar rats were randomly divided into: sham operation group(SO group, n=20), intermittent hypoxia group(IH group, n=20), merely ischemia/reperfusion group(I/R group, n=20), intermittent hypoxia ischemia/reperfusion group(IH+ I/R group, n=20), intermittent hypoxia ischemia/reperfusion+ mTOR inhibitor group(Inhibitor group, n=20). IH group, IH+ I/R group and inhibitor group were respectively given intermittent hypoxia for 21 days before ischemia/reperfusion. Ischemia animals were prepared cerebral ischemia-reperfusion model by improved pulsinelli four vessels block (4-VO), the morphological changes of hippocampus nerve cells of rat brain were detected with HE respectively 6, 24 h after ischemia, and the expressions of mTOR protein and beclin1 protein in hippocampus of rat brain was detected with immunohistochemistry and RT-PCR respectively 6, 24 h after ischemia.SPSS 17.0 software was used to analyze the data. Results: Compared with the SO group, the IH group increased the never cells morphology damages and the empression of mTOR and beclin1 (q value was 32.94, 47.31, 63.68, 78.45, all P<0.05); the I/R group increased the never cells morphology damages and the empression of mTOR and beclin1 (mTOR in I/R group: 22.38±0.46, 24.16±0.60; mTOR in SO group: 14.65±0.48, 15.40±0.58; beclin1 in I/R group: 8.58±0.58, 10.58±0.49; beclin1 in SO group: 2.06±0.23, 2.10±0.30; the differences were significant, q value was 90.59, 106.83, 95.88, 119.44, all P<0.05). Compared with the IH group, IH+ I/R group increased the never cells morphology damages and the empression of mTOR and beclin1 (q value was 152.23, 165.61, 135.01, 156.48, all P<0.05). Compared with the I/R group, IH+ I/R group increased the never cells morphology damages and the empression of mTOR and beclin1(q value was 94.35, 106.99, 102.79, 115.49, all P<0.05). Compared with the IH+ I/R group, the inhibitor group decreased the never cells morphology damages and the expression of mTOR, increased the expression of beclin1(mTOR in IH+ I/R group: 30.40±0.43, 32.86±0.50; mTOR in inhibitor group: 26.60±0.37, 28.51±0.52; beclin1 in IH+ I/R group: 15.57±0.57, 18.78±0.43; beclin1 in inhibitor group: 21.74±0.51, 24.32±0.49; the differences were significant, q value was 44.71, 53.05, 90.74, 78.03, all P<0.05). Conclusion: Intermittent hypoxia can aggravate the damage on nerve cells by activating mTOR/autophagy pathway after ischemia.

Association between polymorphisms in the promoter region of pri-miR-34b/c and risk of hepatocellular carcinoma

Hepatocellular carcinoma (HCC) is a major cause of cancer-related deaths worldwide. MicroRNA-34 (miR-34) gene plays a key role in altering the apoptotic cycle and pathways of downstream cells, and therefore influences carcinogenesis. In this case-control study, we assessed the role of the pri-miR-34b/c rs4938723 polymorphism in HCC risk. The pri-miR-34b/c polymorphic genotype was determined in 286 patients with HCC and 572 controls using polymerase chain reaction-restriction fragment length polymorphism. The male gender (X² = 12.95, P < 0.001), regular alcohol consumption (X² = 16.81, P < 0.001), and a family history of cancer (X² = 11.88, P = 0.001) were associated with HCC risk. However, the age (t = 1.19, P = 0.12) and tobacco smoking habit (X² = 0.64, P = 0.42) of HCC patients were comparable to those of the controls. The TC (adjusted OR = 1.46, 95%CI = 1.06-2.01) and CC (adjusted OR = 3.07, 95%CI = 1.77-5.34) genotypes of pri-miR-34b/c rs4938723 were correlated with a higher risk of HCC compared to the TT genotype. Moreover, the TC+CC genotype was correlated with an increased risk of HCC compared to the TT genotype (adjusted OR = 1.64, 95%CI = 1.21-2.22). In the recessive model, the CC genotype of pri-miR-34b/c rs4938723 was significantly correlated with an elevated risk of HCC compared to the TT+TC genotype (adjusted OR = 2.50, 95%CI = 1.49-4.22). Further large-scale and multi-center studies are required to confirm these results.

Breaking through the strength-ductility trade-off dilemma in an Al-Si-based casting alloy

Al-Si-based casting alloys have a great potential in various industrial applications. Common strengthening strategies on these alloys are accompanied inevitably by sacrifice of ductility, known as strength-ductility trade-off dilemma. Here, we report a simple route by combining rapid solidification (RS) with a post-solidification heat treatment (PHT), i.e. a RS + PHT route, to break through this dilemma using a commercial Al-Si-based casting alloy (A356 alloy) as an example. It is shown that yield strength and elongation to failure of the RS + PHT processed alloy are elevated simultaneously by increasing the cooling rate upon RS, which are not influenced by subsequent T6 heat treatment. Breaking through the dilemma is attributed to the hierarchical microstructure formed by the RS + PHT route, i.e. highly dispersed nanoscale Si particles in Al dendrites and nanoscale Al particles decorated in eutectic Si. Simplicity of the RS + PHT route makes it being suitable for industrial scaling production. The strategy of engineering microstructures offers a general pathway in tailoring mechanical properties of other Al-Si-based alloys. Moreover, the remarkably enhanced ductility of A356 alloy not only permits strengthening further the material by work hardening but also enables possibly conventional solid-state forming of the material, thus extending the applications of such an alloy.

Hypertension-mediated enhancement of JNK activation in association with endoplasmic reticulum stress in rat model hippocampus with cerebral ischemia-reperfusion

Acute brain ischemia can induce the activation of c-Jun N-terminal kinases (JNKs). Hypertension is a critical etiology for brain ischemia. We identified the effects of hypertension on the activation of JNK as well as its impact on SP600125, a JNK inhibitor, during endoplasmic reticulum stress (ERS) in the hippocampus using a rat model. Transient whole-brain ischemia was induced by 4-vessel occlusion (bilateral vertebral and bilateral common carotid arteries) in normal and spontaneous hypertensive rats. SP600125 (0.05 mg/kg, iv) was administered 30 min before ischemia. Morphological changes in hippocampal nerve cells were observed by cresyl violet staining. Phosphorylation of JNK, and expression levels of CHOP and GPR78, markers for ERS, were detected by western blot at 1, 6, 24, and 48 h, and neurological outcomes were measured using an eight-arm radial maze 48 h after ischemia. Hypertension apparently aggravated impairment of memory function, decreased the density of surviving neurons, increased phosphorylation of JNK, and enhanced CHOP expression, but reduced GPR78 levels in hippocampal tissues following brain ischemia. SP600125 alleviated neurological dysfunction, improved neuron survival, decreased phosphorylation of JNK and levels of CHOP, but increased expression of GPR78 in rats with hypertension during cerebral ischemia by inhibition of ERS.

Characterization of Baylisascaris schroederi from Qinling subspecies of giant panda in China by the first internal transcribed spacer (ITS-1) of nuclear ribosomal DNA

In the present study, a total of 20 nematode isolates, (including 10 male and 10 female worms) representing Baylisascaris schroederi from 5 Qinling subspecies of giant pandas (Ailuropoda melanoleuca) in Shaanxi Province of China, were characterized and grouped genetically by the first internal transcribed spacer (ITS-1) of nuclear ribosomal DNA (rDNA). The rDNA fragment spanning 3' end of 18S rDNA, complete ITS-1 rDNA, and 5' end of 5.8S rDNA were amplified and sequenced. The sequence variability in ITS-1 rDNA was examined within B. schroederi and among parasites in order Ascaridata available in GenBank™, and their phylogenetic relationships were also reconstructed. The sequences of ITS-1 rDNA for all the B. schroederi isolates were 427 bp in length, with no genetic variation detected among these isolates. Phylogenetic analyses based on the ITS-1 rDNA sequences revealed that all the male and female B. schroederi isolates sequenced in the present study were posited into the clade of genus Baylisascaris, sistered to zoonotic nematodes in genus Ascaris, and the ITS-1 rDNA sequence could distinguish different species in order Ascaridata. These results showed that the ITS-1 rDNA provides a suitable molecular marker for the inter-species phylogenetic analysis and differential identification of nematodes in order Ascaridata.

Physical location of the carotenoid biosynthesis genes Psy and β-Lcy in Capsicum annuum (Solanaceae) using heterologous probes from Citrus sinensis (Rutaceae)

Carotenoids are responsible for a range of fruit colors in different hot pepper (Capsicum) varieties, from white to deep red. Color traits are genetically determined by three loci, Y, C1, and C2, which are associated with carotenogenic genes. Although such genes have been localized on genetic maps of Capsicum and anchored in Lycopersicon and Solanum, physical mapping in Capsicum has been restricted to only a few clusters of some multiple copy genes. Heterologous probes from single copy genes have been rarely used. Fluorescent in situ hybridization was performed in Capsicum annuum varieties with different fruit colors, using heterologous probes of Psy and β-Lcy genes obtained from a BAC library of the sweet orange (Citrus sinensis). The probes hybridized in the terminal portion of a chromosome pair, confirming the location of these genes in genetic maps. The hybridized segments showed variation in size in both chromosomes.

Influence of eutrophication on the distribution of total mercury and methylmercury in hydroelectric reservoirs

The distribution of mercury (Hg) and the characteristics of its methylation were investigated in Wujiangdu (WJD) and Yinzidu (YZD) reservoirs in Guizhou province, China. The two reservoirs are characterized by high and low levels of primary productivity, respectively. Mercury species in water samples from depth profiles in both reservoirs and from interface water in the WJD were analyzed each season during 2007. The concentrations of total Hg (HgT(unf)) and methylmercury (MeHgT(unf)) in unfiltered water samples from the WJD varied from 3.0 to 18 pmol dm(-3) and from 0.17 to 15 pmol dm(-3), respectively; ranges were 2.0 to 9.5 pmol dm(-3) for HgT(unf) and 0.14 to 2.2 pmol dm(-3) for MeHgT(unf) in the YZD. Elevated methylmercury concentrations in water samples from the bottom water and water-sediment interface demonstrated an active net Hg methylation in the downstream reach of the WJD. There was no discernable Hg methylation occurring in the YZD, nor in the upstream and middle reaches of the WJD. The results suggest that high primary productivity resulting from cage aquaculture activities in the WJD is an important control on Hg methylation in the reservoir, increasing the concentrations of MeHg in water in the Wujiang River basin Southwestern China.

Loss of the Parkinson's disease-linked gene DJ-1 perturbs mitochondrial dynamics

Growing evidence highlights a role for mitochondrial dysfunction and oxidative stress as underlying contributors to Parkinson's disease (PD) pathogenesis. DJ-1 (PARK7) is a recently identified recessive familial PD gene. Its loss leads to increased susceptibility of neurons to oxidative stress and death. However, its mechanism of action is not fully understood. Presently, we report that DJ-1 deficiency in cell lines, cultured neurons, mouse brain and lymphoblast cells derived from DJ-1 patients display aberrant mitochondrial morphology. We also show that these DJ-1-dependent mitochondrial defects contribute to oxidative stress-induced sensitivity to cell death since reversal of this fragmented mitochondrial phenotype abrogates neuronal cell death. Reactive oxygen species (ROS) appear to play a critical role in the observed defects, as ROS scavengers rescue the phenotype and mitochondria isolated from DJ-1 deficient animals produce more ROS compared with control. Importantly, the aberrant mitochondrial phenotype can be rescued by the expression of Pink1 and Parkin, two PD-linked genes involved in regulating mitochondrial dynamics and quality control. Finally, we show that DJ-1 deficiency leads to altered autophagy in murine and human cells. Our findings define a mechanism by which the DJ-1-dependent mitochondrial defects contribute to the increased sensitivity to oxidative stress-induced cell death that has been previously reported.

Prediction of human intestinal absorption using an artificial neural network

An artificial neural network model is developed to predict percent human intestinal absorption (%FA) of compounds from their molecular structural parameters. These parameters are the polar molecular surface area (PSA), the fraction of polar molecular surface area (FPSA, polar molecular surface area/ molecular surface area), the sum of the net atomic charges of oxygen atoms (Q(O)), the sum of the net atomic charges of nitrogen atoms with net negative atomic charges (Q(N)), the sum of the net atomic charges of hydrogen atoms attached to oxygen or nitrogen atoms (Q(H)), and the number of carboxyls (nCOOH). For a training set of 85 compounds anda test set of 10 compounds, root mean squared errors (RMSE) between experimental %FA valuesand calculated/predicted %FA values are 8.86% and 14.1%, respectively.

Molecular tagging and genetic mapping of the disease resistance gene RppQ to southern corn rust

Southern corn rust (SCR), Puccinia polysora Underw, is a destructive disease in maize ( Zea mays L.). Inbred line Qi319 is highly resistant to SCR. Results from the inoculation test and genetic analysis of SCR in five F(2) populations and five BC(1)F(1 )populations derived from resistant parent Qi319 clearly indicate that the resistance to SCR in Qi319 is controlled by a single dominant resistant gene, which was named RppQ. Simple sequence repeat (SSR) analysis was carried out in an F(2) population derived from the cross "Qi319x340". Twenty SSR primer pairs evenly distributed on chromosome10 were screened at first. Out of them, two primer pairs, phi118 and phi 041, showed linkage with SCR resistance. Based on this result, eight new SSR primer pairs surrounding the region of primers phi118 and phi 041 were selected and further tested regarding their linkage relation with RppQ. Results indicated that SSR markers umc1,318 and umc 2,018 were linked to RppQ with a genetic distance of 4.76 and 14.59 cM, respectively. On the other side of RppQ, beyond SSR markers phi 041 and phi118, another SSR marker umc1,293 was linked to RppQ with a genetic distance of 3.78 cM. Because the five linkage SSR markers (phi118, phi 041, umc1,318, umc 2,018 and umc1,293) are all located on chromosome 10, the RppQ gene should also be located on chromosome 10. In order to fine map the RppQ gene, AFLP (amplified fragment length polymorphism) analysis was carried out. A total 54 AFLP primer combinations were analyzed; one AFLP marker, AF1, from the amplification products of primer combination E-AGC/M-CAA, showed linkage with the RppQ gene in a genetic distance of 3.34 cM. Finally the RppQ gene was mapped on the short arm of chromosome 10 between SSR markers phi 041 and AFLP marker AF1 with a genetic distance of 2.45 and 3.34 cM respectively.

[Expression of hepatitis B virus antigen in brain tissue from liver cirrhosis patients with hepatitis B and its significance]

OBJECTIVE

To investigate the expression of hepatitis B virus (HBV) antigen in brain tissue from liver cirrhosis patients with hepatitis B and explore its significance.

METHODS

HBsAg and HBcAg were detected in the brain tissue from 70 liver cirrhosis dead patients with hepatitis B by S-P immunohistochemical assay, and the relationship between the expression of HBV antigen in brain tissue testing and clinic and pathology was analyzed.

RESULTS

30 patients (42.89%) were positive for HBV antigen. Among them, 24 patients (34.29%) were positive for HBsAg and 18 patients (25.71%) were positive for HBcAg. HBV antigen was mainly found in cytoplasm and distributed in neurons, neurogliocytes and vascular endothelial cells. The positive cells were distributed separately, scatteredly or focally. The expression of HBV antigen was not associated with the serum level of HBV replication but associated with the occurrence of hepatic encephalopathy (HE) and the severity of brain tissue pathologic lesions of HE.

CONCLUSIONS

The results indicate that HBV infection develop in brain tissue from liver cirrhosis patients with hepatitis B and HBV may replicate in it. HBV infection in brain tissue may p lay an important role in occurrence and development of HE from liver cirrhosis patients with hepatitis B.

[Application of isonucleus and isocytoplasmic lines in the study of maize CMS]

Between wild fertile type (F) and its sterile mutant (cms), if their nucleus and cytoplasm are the same, this wild fertile type (F) and its sterile mutant (cms) are called isonucleus and isocytoplasmic lines. The maize mtDNAs of isonucleus and isocytoplasmic lines (I), wild fertile type 478(F) and its sterile mutant 478-cms, were analyzed by RAPD. 94 primers were screened, 3 polymorphic products, OPZ-19(420), OPAA-15(600) and OPS-01(400), were amplified between 478(F) and 478-cms. The results showed that mtDNAs in isonucleus and isocytoplasmic lines were more homologous than that in others. There is minor mtDNA difference between the fertile type (F) and its sterile type (cms) in a pair of isonucleus and isocytoplasmic lines. The polymorphism detected in isonucleus and isocytoplasmic lines may be more closely linked with the gene of fertility. Therefore, isonucleus and isocytoplasmic line is an excellent system in the study of CMS. Sister isonucleus and isocytoplasmic lines are consisted of 2 groups of isonucleus and isocytoplasmic lines in which their nucleus are not all the same but closely related, their cytoplasm are the same. Using sister isonucleus and isocytoplasmic lines is equal to determining the change of fertility by transferring one cytoplasm into the isonucleus. Isonucleus and isocytoplasmic lines (II) are consisted of Su478(F) and Su478-cms. Isonucleus and isocytoplasmic lines (I) and (II) are sister isonucleus and isocytoplasmic lines. The polymorphic products, OPZ-19(420) and OPAA-15(600), can also be obtained in isonucleus and isocytoplasmic lines (II). The 2 polymorphic products OPZ-19(420) and OPAA-15(600) are existed in both of the isonucleus and isocytoplasmic lines. This showed that isonucleus and isocytoplasmic lines are practicable in the study of CMS, and that common polymorphism in isonucleus and isocytoplasmic lines may be related more directly to fertility.

Triterpenoid saponins from Clematis tangutica

Two new triterpenoid saponins, tanguticoside A and B along with seven known saponins vitalboside B, alpha-hederin, saponin PK, beta-hederin, saponin PJ3, saponin PE, and ciwujianoside A were isolated from aerial part of Clematis tangutica. By chemical and spectral evidences methods, the structures of tanguticoside A and B were elucidated as 3-O-beta-D-glucopyranosylhederagenin 28-O-alpha-L-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside and 3-O-beta-D-glucopyranosyl-(1-->2)-beta-D-glucopyranosylhederagenin 28-O-alpha-D-rhamnopyranosyl-(1-->4)-beta-D-glucopyranosyl-(1-->6)-beta-D-glucopyranoside, respectively.

Predicting blood-brain barrier penetration of drugs by polar molecular surface area and molecular volume

AIM

To predict the blood-brain barrier penetration by polar molecular surface area and molecular volume.

METHODS

Polar molecular surface area and molecular volume are calculated by Monte Carlo method from the lowest energy conformation obtained using the semiempirical self-consistent field molecular orbital calculation AM1 method. The stepwise multiple regression analysis is used to derive the correlation equations between the ratios of the steady-state concentrations of the training compounds in the brain to in the blood (logBB)and their structural parameters.

RESULTS

For a training set of 56 compounds, logBB values are well correlated with the sums of surface areas of oxygen and nitrogen atoms (SO,N, A2, excluding the nitrogen atoms in nitrogen molecule or in nitro) and molecular volumes (V, A3). The regression equation is logBB = -1.331 x 10(-5)V2 + 9.228 x 10(-3)V -0.02439 SO,N -0.4318 (n = 56, r = 0.9043). The calculated logBB values of a test set of 10 compounds from the model agree well with their experimental logBB values.

CONCLUSION

The model is simple and effective. It can be used to predict the logBB values of candidate molecule in drug design.

Endothelium-independent vasorelaxation by leonurine, a plant alkaloid purified from Chinese motherwort

Leonurine, a plant alkaloid present in Chinese motherwort, induced concentration- dependent and endothelium-independent relaxation of phenylephrine (PE)- pretreated rat aortic arterial rings. The IC50 values for leonurine were 86.4+/-10.4 and 85.9+/-17.2 microM in the presence and absence of endothelium respectively. It inhibited the responses of aortic smooth muscle to PE in Ca2+ free medium containing 100 microM EGTA, suggesting a possible action on the release of intracellular Ca2+. Leonurine is not a specific alpha-adrenoceptor blocker, since it also caused a concentration-dependent inhibition of vascular contractile responses to KCl with an IC50 value of 96.4+/-13.4 microM, suggesting that leonurine also blocks the L-type Ca2+-channel. In addition, leonurine relaxed the aortic contraction induced by prostaglandin F2alpha (PGF2alpha). These inhibitory effects of leonurine were reversible and did not affect the resting tension. In conclusion, these findings suggest that leonurine is an effective inhibitor of vascular smooth tone, probably acting by inhibiting the Ca2+ influx and the release of intracellular Ca2+.

[Integration of the genetic map and the physical map of the subterminal region on the longer arm of rice chromosome 6]

The region between RFLP markers G342 and R1167 was the subterminal part of the longer arm on the rice chromosome 6, because Shen et al. (1998) mapped two telomeric repeat associated sequences distal to G342. In order to integrate the genetic map and the physical map of the region, G342 and R1167 were firstly used to screen BAC library. Based on the positive clones detected by the two markers and chromosome walking by using the outer most insert-end of the overlapping clones, a contig containing 16 BAC clones which spanned 500 kb was constructed. All the insert-ends of the BAC clones could be amplified with thermal asymmetric interlaced PCR. Fourteen insert-ends were subcloned. Seven of them were identified as a single or low copy sequences and five were mapped on the expected sites flanking G342 or R1167. The insert fragment isolated from the minimum tile BAC clones of the contig was used to screen a cDNA library and four different positive clones were detected.

A third member of the RNA-specific adenosine deaminase gene family, ADAR3, contains both single- and double-stranded RNA binding domains

Members of the double-stranded RNA- (dsRNA) specific adenosine deaminase gene family convert adenosine residues into inosines in dsRNA and are involved in A-to-I RNA editing of transcripts of glutamate receptor (GluR) subunits and serotonin receptor subtype 2C (5-HT(2C)R). We have isolated hADAR3, the third member of this class of human enzyme and investigated its editing site selectivity using in vitro RNA editing assay systems. As originally reported for rat ADAR3 or RED2, purified ADAR3 proteins could not edit GluR-B RNA at the "Q/R" site, the "R/G" site, and the intronic "hot spot" site. In addition, ADAR3 did not edit any of five sites discovered recently within the intracellular loop II region of 5-HT(2C)R RNAs, confirming its total lack of editing activity for currently known substrate RNAs. Filter-binding analyses revealed that ADAR3 is capable of binding not only to dsRNA but also to single-stranded RNA (ssRNA). Deletion mutagenesis identified a region rich in arginine residues located in the N-terminus that is responsible for binding of ADAR3 to ssRNA. The presence of this ssRNA-binding domain as well as its expression in restricted brain regions and postmitotic neurons make ADAR3 distinct from the other two ADAR gene family members, editing competent ADAR1 and ADAR2. ADAR3 inhibited in vitro the activities of RNA editing enzymes of the ADAR gene family, raising the possibility of a regulatory role in RNA editing.

Altered G protein-coupling functions of RNA editing isoform and splicing variant serotonin2C receptors

Different isoforms of serotonin subtype 2C receptor (5-HT(2C)R) with altered G protein-coupling efficacy are generated by RNA editing, which converts genomically encoded adenosine residues into inosines. In combination, editing of five sites all located within the second intracellular loop region of 5-HT(2C)R mRNA changes the gene-encoded Ile, Asn, and Ile at positions 156, 158, and 160, respectively. We analyzed the G protein-coupling functions of previously unreported editing isoform receptors. An approximately 13-fold reduction in the agonist potency for G protein-coupling stimulation as well as a significantly reduced basal level activity was observed with the thalamus-specific isoform carrying Ile156, Gly158, and Val160 (5-HT(2C)R-IGV). In contrast, the agonist was four- to five-fold less potent with 5-HT(2C)R-MSV and -IDV, detected in the amygdala and choroid plexus, respectively, indicating a dominant role for the amino acid residue at position 158 in receptor functions. We also identified a splicing variant receptor with a truncated C terminus that displayed no ligand binding capacity or G protein-coupling activity. Examination of the alternatively spliced RNA encoding this truncated receptor suggests that editing of this variant RNA occurs after completion of splicing, resulting in complete editing at all five sites.

Dramatic increase of the RNA editing for glutamate receptor subunits during terminal differentiation of clonal human neurons

RNA editing plays an important role in determining physiological characteristics of certain glutamate-gated receptor (GluR) channels such as Ca2+ permeability and desensitization kinetics. In one case, the editing changes a gene-encoded glutamine (Q) to an arginine (R) codon located in the channel-forming domain of the alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) receptor subunit GluR-B and also the kainate receptor subunits GluR5 and GluR6. Another case of RNA editing alters an arginine (R) to a glycine (G) codon at a position termed the "R/G" site of AMPA subunits GluR-B, C, and D. Double-stranded RNA-specific adenosine deaminases (DRADA) have been implicated as agents involved in the editing. By using a human teratocarcinoma cell line, NT2, we investigated the change of the RNA editing of GluR subunits in conjunction with the expression of two DRADA members, DRADA1 and DRADA2 genes, during neuronal differentiation. Whereas Q/R and R/G site RNA editing both become progressively activated in differentiating NT2 cells, the expression of the two DRADA genes can already be detected even in the undifferentiated NT2 cells. Development of the editing machinery appears to require, in addition to DRADA enzymes, a currently unidentified mechanism(s) that may become activated during neuronal differentiation.

Editing of glutamate receptor B subunit ion channel RNAs by four alternatively spliced DRADA2 double-stranded RNA adenosine deaminases

Double-stranded (ds) RNA-specific adenosine deaminase converts adenosine residues into inosines in dsRNA and edits transcripts of certain cellular and viral genes such as glutamate receptor (GluR) subunits and hepatitis delta antigen. The first member of this type of deaminase, DRADA1, has been recently cloned based on the amino acid sequence information derived from biochemically purified proteins. Our search for DRADA1-like genes through expressed sequence tag databases led to the cloning of the second member of this class of enzyme, DRADA2, which has a high degree of sequence homology to DRADA1 yet exhibits a distinctive RNA editing site selectivity. There are four differentially spliced isoforms of human DRADA2. These different isoforms of recombinant DRADA2 proteins, including one which is a human homolog of the recently reported rat RED1, were analyzed in vitro for their GluR B subunit (GluR-B) RNA editing site selectivity. As originally reported for rat RED1, the DRADA2a and -2b isoforms edit GluR-B RNA efficiently at the so-called Q/R site, whereas DRADA1 barely edits this site. In contrast, the R/G site of GluR-B RNA was edited efficiently by the DRADA2a and -2b isoforms as well as DRADA1. Isoforms DRADA2c and -2d, which have a distinctive truncated shorter C-terminal structure, displayed weak adenosine-to-inosine conversion activity but no editing activity tested at three known sites of GluR-B RNA. The possible role of these DRADA2c and -2d isoforms in the regulatory mechanism of RNA editing is discussed.

Imaging approach to the diagnosis of pulmonary sequestration

PURPOSE

To describe the characteristic features of pulmonary sequestration (PS), to evaluate the usefulness of various imaging modalities, and to find a rational approach to accurate diagnosis.

MATERIAL AND METHODS

Twenty-four patients with PS proved by operation and pathology were reviewed retrospectively. Plain chest films were done in all patients, bronchography in 3, sonography in 14, CT in 6 (including CT angiography in 1 case), MR in 8 (including MR angiography in 1 case) and aortography in 12 (including DSA in 1 case).

RESULTS

Plain chest films demonstrated a solid mass in 14 patients and a cystic mass in 10. Bronchograms showed displacement of adjacent bronchi with no filling of contrast medium within the lesion in 2 cases, while another case had a blind intermediate portion of the right bronchus (hypoplasia of middle and lower lobes associated with extralobar sequestration). Sonography demonstrated a solid lung mass in 12 cases and a solid mass with cystic areas in 2, and detected vessel-like structures within the mass or in its surroundings in 12. Doppler analysis showed arterial spectral wave confirming a feeding artery. CT revealed a solid mass in all patients, a mass with low density area in 4, and emphysema surrounding the mass in 3. MR imaging depicted anomalous arteries in all patients and venous drainage in 4 cases. Aortography demonstrated anomalous systemic arterial supply to the PS in all patients. In this series, 21 cases (87.5%) were correctly diagnosed preoperatively by the imaging modalities.

CONCLUSION

Plain chest films can provide a diagnostic clue to PS. Sonography, CT and MR are helpful for showing arterial blood supply and for making a definite diagnosis. We recommend a rational imaging approach for the diagnosis of PS.

Inhibition of hepatitis B virus in vitro by antisense oligonucleotides

A series of antisense phosphorothioate oligodeoxynucleotides against hepatitis B virus (HBV) were synthesized and evaluated for their antiviral effect in Hep-G2 cells transfected with HBV genome. The inhibitory effect of the tested antisense oligonucleotides was sequence-specific, dose-and time-dependent, and synergistic for certain combinations. In virus-inhibitory concentrations the oligonucleotides were harmless to 2.2.15 cells. The most effective antisense oligonucleotides were found directed against the HBV mRNA transcribed from the cap site of SP II promoter, the portion of polyadenylation signal and the initiation region of gene S, with an inhibition of the HBsAg and HBeAg production by 85-95% and 50- 60%, respectively. To our surprise, antisense oligonucleotides directed against three key sites of HBV X gene blocked the expression of HBsAg, HBeAg and HBxAg. This fact might be related to the trans-activation of HBV X protein. Using radioisotope labelling, we demonstrated that Lipofectin promoted the cellular uptake and antiviral effect of antisense oligomers in 2.2.15 cells. These results suggest a therapeutic potential of antisense oligonucleotides in the treatment of patients chronically infected with HBV.

A program to measure new energetic particle nuclear interaction cross sections

The Transport Collaboration, consisting of researchers from institutions in France, Germany, Italy and the USA, has established a program to make new measurements of nuclear interaction cross sections for heavy projectiles (Z > or = 2) in targets of liquid H2, He and heavier materials. Such cross sections directly affect calculations of galactic and solar cosmic ray transport through matter and are needed for accurate radiation hazard assessment. To date, the collaboration has obtained data using the LBL Bevalac HISS facility with 20 projectiles from 4He to 58Ni in the energy range 393-910 MeV/nucleon. Preliminary results from the analysis of these data are presented here and compared to other measurements and to cross section prediction formulae.

Hydrogen bond interactions of G proteins with the guanine ring moiety of guanine nucleotides

We have utilized Raman difference spectroscopy to investigate hydrogen bonding interactions of the guanine moiety in guanine nucleotides with the binding site of two G proteins, EF-Tu (elongation factor Tu from Escherichia coli) and the c-Harvey ras protein, p21 (the gene product of the human c-H-ras proto-oncogene). Raman spectra of proteins complexed with GDP (guanosine 5' diphosphate), IDP (inosine 5' diphosphate), 6-thio-GDP, and 6-18O-GDP were measured, and the various difference spectra were determined. These were compared to the difference spectra obtained in solution, revealing vibrational features of the nucleotide that are altered upon binding. Specifically, we observed significant frequency shifts in the vibrational modes associated with the 6-keto and 2-amino positions of the guanine group of GDP and IDP that result from hydrogen bonding interactions between these groups and the two proteins. These shifts are interpreted as being proportional to the local energy of interaction (delta H) between the two groups and protein residues at the nucleotide binding site. Consistent with the tight binding between the nucleotides and the two proteins, the shifts indicate that the enthalpic interactions are stronger between these two polar groups and protein than with water. In general, the spectral shifts provide a rationale for the stronger binding of GDP and IDP with p21 compared to EF-Tu. Despite the structural similarity of the binding sites of EF-Tu and p21, the strengths of the observed hydrogen bonds at the 6-keto and 2-amino positions vary substantially, by up to a factor of 2.(ABSTRACT TRUNCATED AT 250 WORDS)

[The comparison of left and right heart function with lung function in patients with rheumatic valvar heart disease]

According to the characteristics of changes of heart and lung function at different stages 25 patients with rheumatic valvar heart disease could be classified into three stages: 1. The stage of normal lung ventilation and volumes; 2. Stage of obstructive ventilatory function; 3. The stage of mixed ventilatory defects associated with right heart failure. As pulmonary artery pressure increased right ventricle work became elevated and left ventricle work decreased. There was an inverse correlation of vital capacity with per minute work of right ventricle.

Intracranial MRA: single volume vs. multiple thin slab 3D time-of-flight acquisition

Single volume three-dimensional (3D) time-of-flight (TOF) MR angiography is the most commonly used noninvasive method for evaluating the intracranial vasculature. The sensitivity of this technique to signal loss from flow saturation limits its utility. A recently developed multislab 3D TOF technique, MOTSA, is less affected by flow saturation and would therefore be expected to yield improved vessel visualization. To study this hypothesis, intracranial MR angiograms were obtained on 10 volunteers using three techniques: MOTSA, single volume 3D TOF using a standard 4.9 ms TE (3D TOFA), and single volume 3D TOF using a 6.8 ms TE (3D TOFB). All three sets of axial source images and maximum intensity projection (MIP) images were reviewed. Each exam was evaluated for the number of intracranial vessels visualized. A total of 502 vessel segments were studied with each technique. With use of the MIP images, 86% of selected vessels were visualized with MOTSA, 64% with 3D TOFA (TE = 4.9 ms), and 67% with TOFB (TE = 6.8 ms). Similarly, with the axial source images, 91% of selected vessels were visualized with MOTSA, 77% with 3D TOFA (TE = 4.9 ms), and 82% with 3D TOFB (TE = 6.8 ms). There is improved visualization of selected intracranial vessels in normal volunteers with MOTSA as compared with single volume 3D TOF. These improvements are believed to be primarily a result of decreased sensitivity to flow saturation seen with the MOTSA technique. No difference in overall vessel visualization was noted for the two single volume 3D TOF techniques.

Inhibitory effect of rhynchophylline on platelet aggregation and thrombosis

Rhynchophylline (Rhy) inhibited rabbit platelet aggregation induced by arachidonic acid (AA), collagen, and ADP. The values of IC50 were 0.72, 0.74, and 0.67 mmol.L-1, respectively. Rhy reduced the thromboxane B2 (TXB2) generation in PRP induced by collagen but failed to reduce that induced by AA. Rhy suppressed malondialdehyde (MDA) formation in platelet suspension stimulated by thrombin, inhibited the platelet factor 4 (PF4) release. It did not alter intraplatelet cAMP concentration. Rhy 10-20 mg.kg-1 iv showed a significant inhibition of venous thrombosis and cerebral thrombosis in rats.

An isotope edited classical Raman difference spectroscopic study of the interactions of guanine nucleotides with elongation factor Tu and H-ras p21

We have measured the Raman spectrum of GDP bound to the elongation factor protein, EF-Tu, and the c-Harvey-ras protein, p21, two proteins of the guanine nucleotide binding family. In order to separate the Raman spectrum of the nucleotide from the much more intense protein spectrum, we investigate the feasibility of "tagging" the normal modes of the nucleotide by isotopic substitution, here by incoporating deuterium-labeled guanine at the C8 position into the active site. A difference spectrum between the labeled and unlabeled protein-nucleotide complex shows the changes in the Raman spectrum of the bound nucleotide that arise from the isotopic exchange. We find that surprisingly good Raman spectra of bound ligands can be obtained with this method and that the method can be easily generalized to other systems. The data show that the guanine amino group of the nucleotide interacts differently with both EF-Tu and p21 than it does with water, showing a change in hydrogen-bonding properties upon binding. On the other hand, no change in hydrogen bonding is observed at guanine's N7. The data strongly suggest that the conformation of the nucleotide when bound to EF-Tu and that p21 is the C2' endo pucker of the ribose ring and anti about the glycosidic bond. These results are compared to previous structural and chemical studies.

[The kinetics of plasma coagulation fibrinolysis levels in acute myocardial infarction before and after treatment with intravenous urokinase]

The levels of tissue-type plasminogen activator (t-PA), plasminogen activator inhibitor (PAI) and other substances of coagulation-fibrinolysis, such as fibronectin (Fn) and von willebrand factor (vWF) as well as the activity content of antithrombin-III(AT-III) in plasma were determined in 20 patients with acute myocardial infarction (AMI). In 11 of them these measurements were carried out before and after the treatment with urokinase (UK1000 000 IU). The results suggested that the function of coagulation-fibrinolytic system was disturbed in AMI. Thrombolytic treatment with UK could interfere and improve the stabilization of fibrinolytic activity in the body, but these actions last only short time. Some substances of coagulation showed change with UK treatment.

Four-year experience in the treatment of upper gastrointestinal strictures with balloon dilatation

One hundred and sixty-four cases of upper gastrointestinal tract stricture were treated by balloon dilatation in 4 years. A total of 682 procedures were performed. One hundred and forty cases (anastomosis stenosis 95, caustic stenosis 33 and other stenoses of the esophagus 12) were followed up with an effective rate of 90% (126/140) and a long-term effective rate of 71.4% (100/140). Fourteen cases (10%) failed, and 11 of them were due to tumor recurrence. The concept about the short-term and long-term effects, the criteria for evaluation of the results, the factors influencing the effectiveness, and the time suitable for dilatation are described. For the dilatation, indications are anastomosis stricture of the upper gastrointestinal tract, esophageal web and caustic stenosis of the esophagus. This method is also indicated for cicatricial stricture of the upper gastrointestinal tract of various causes.