IFN-γ secretion in gut of Ob/Ob mice after vertical sleeve gastrectomy and its function in weight loss mechanism / 华中科技大学学报（医学）（英德文版）

Vertical sleeve gastrectomy (VSG) is becoming more and more popular among the world. Despite its dramatic efficacy, however, the mechanism of VSG remains largely undetermined. This study aimed to test interferon (IFN)-γ secretion n of mesenteric lymph nodes in obese mice (ob/ob mice), a model of VSG, and its relationship with farnesoid X receptor (FXR) expression in the liver and small intestine, and to investigate the weight loss mechanism of VSG. The wild type (WT) mice and ob/ob mice were divided into four groups: A (WT+Sham), B (WT+VSG), C (ob/ob+Sham), and D (ob/ob+VSG). Body weight values were monitored. The IFN-γ expression in mesenteric lymph nodes of ob/ob mice pre- and post-operation was detected by flow cytometry (FCM). The FXR expression in the liver and small intestine was detected by Western blotting. The mouse AML-12 liver cells were stimulated with IFN-γ at different concentrations in vitro. The changes of FXR expression were also examined. The results showed that the body weight of ob/ob mice was significantly declined from (40.6±2.7) g to (27.5±3.8) g on the 30th day after VSG (P<0.05). At the same time, VSG induced a higher level secretion of IFN-γ in mesenteric lymph nodes of ob/ob mice than that pre-operation (P<0.05). The FXR expression levels in the liver and small intestine after VSG were respectively 0.97±0.07 and 0.84±0.07 fold of GAPDH, which were significantly higher than pre-operative levels of 0.50±0.06 and 0.48±0.06 respectively (P<0.05). After the stimulation of AML-12 liver cells in vitro by different concentrations of IFN-γ (0, 10, 25, 50, 100, and 200 ng/mL), the relative FXR expression levels were 0.22±0.04, 0.31±0.04, 0.39±0.05, 0.38±0.05, 0.56±0.06, and 0.35±0.05, respectively, suggesting IFN-γ could distinctly promote the FXR expression in a dose-dependent manner in comparison to those cells without IFN-γ stimulation (P<0.05). It was concluded that VSG induces a weight loss in ob/ob mice by increasing IFN-γ secretion of mesenteric lymph nodes, which then increases the FXR expression of the liver and small intestine.

Dendritic Cells Promote the Proliferation of Peripheral Blood CRTH2 Cells (CD4(+)CD294(+)Th2) and Help B Cells to Secrete Immunoglobulin / 中国实验血液学杂志

Objective：To investigate the promotive effect of dendritic cells(DCs) on proliferation of CRTH2 (CD4(+)CD294(+)Th2) cells and the influence of CRTH2 cells on secretion of immunoglobulin from B cells so as to provide a new approach for amplification and sorting of Th2 cells. Methods：DCs were induced from peripheral blood mononuclear cells, then the loaded-BCGV-Ag-DCs were cocultured with T cells, and the mixed lymphocyte reaction(MLR) was performed by CCK8 method. The phenotypes of DCs and CRTH2 cells were detected by flow cytometry. CRTH2 cells sorted by MACS were co-cultured with B cells for 5 days to detect the secretion of immunoglobulin. Results：The subsets and absolute number CRTH2 cells were significantly increased by loaded-BCGV-Ag-DCs. The levels of IgG, IgA and IgE were higher increased in supernatant of CRTH2 and B cell co-culture system than that in control group or that in transwell group(P<0.05). Conclusion：The proliferation of CRTH2 cells can be greatly promoted by loaded-BCGV-Ag-DCs, and the CRTH2 cells can help B cells to secrete IgG, IgA and IgE.

BRAF(V⁶⁰⁰E) mutation and its association with clinicopathological features of papillary thyroid microcarcinoma: A meta-analysis / 华中科技大学学报（医学）（英德文版）

Recent studies have demonstrated that the BRAF(V600E) mutation is associated with aggressive clinicopathological features of papillary thyroid carcinoma (PTC). However, the BRAF mutation as a prognostic biomarker in papillary thyroid microcarcinoma (PTMC) is unclear. A systematic search of the electronic databases, including Medline, Scopus, CNKI and the Cochrane Library was performed up to July 1, 2014. Outcomes of interest included age, gender, concomitant hashimoto thyroiditis or nodular goiter, tumor size, pathological stage, tall cell variant of PTMC (TCVPTMC), multifocality, extrathyroidal extension (ETE) and lymph node metastasis (LNM). A total of 19 studies published from 2008 to 2014 comprising 2253 patients fulfilled the inclusion criteria and were included in the meta-analysis, and 1143 (50.7%) of these patients were BRAF mutation positive. BRAF mutation was associated with larger tumor size (OR: 1.64; 95% CI: 1.16-2.32), multifocality (OR: 1.58; 95% CI: 1.25-2.00), ETE (OR: 2.59; 95% CI: 2.03-3.29), LNM (OR: 1.73; 95% CI: 1.14-2.62), advanced stage (OR: 2.03; 95% CI: 1.14-3.64) and TCVPTMC (OR: 5.07; 95% CI: 1.49-17.27; P=0.009). Additionally, the BRAF mutation was found to be not associated with age, gender, concomitant hashimoto thyroiditis or nodular goiter (P>0.05 for all). This meta-analysis revealed that in patients with PTMC, BRAF mutation is associated with tumor size, multifocality, ETE, LNM, advanced stage and TCVPTMC, and it may be used as a predictive factor for prognosis of PTMC.

Effect of carbon disulfide on expression of matrix metalloproteinase-2 and metalloproteinase-9 in embryo and uterus of pregnant mice / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To observe the effect of carbon disulfide (CS(2)) on the expression of matrix metalloproteinase (MMP)-2, MMP-9 in mouse embryo and uterus tissues and to explore the mechanism of embryo toxicity induced by CS(2).</p><p><b>METHODS</b>At the phases of follicular development and embryonic implantation which was subdivided into early-implantation phase and late-implantation phase, mice were intraperitoneally exposed to CS(2) (the dosage was 631.4 mg/kg, and the volume was 0.1ml/10 g body weight) for 2 consecutive days. All indicators were got at the ninth day in gestation, and the expression of MMP-2 and MMP-9 in embryo and uterus tissues was analyzed by gelatin zymography.</p><p><b>RESULTS</b>The number of implanted embryos significantly decreased after exposure at late-implantation phase (16.000 ± 12.166) compared with those of the control (30.700 ± 5.599, P < 0.05). Expression of MMP-2 and MMP-9 in embryos declined obviously at the three reproductive phases (P < 0.01), and the levels of MMP-2 and MMP-9 expression in embryos at the phases of late-implantation phase (0.6837 ± 0.0929, 0.7309 ± 0.0822) and follicular development (0.6222 ± 0.0997, 0.7520 ± 0.1068) were much lower than those of the control (1.0000 ± 0.0710, 1.0000 ± 0.0413, P < 0.01). Expression of MMP-2 and MMP-9 in uterus significantly increased at the phase of late-implantation (1.3153 ± 0.3032, 5.0210 ± 4.0307) compared with those of the control (1.0000 ± 0.1771, 1.0000 ± 0.0996, P < 0.01).</p><p><b>CONCLUSION</b>Embryo toxicity of CS(2) is more obvious at the phase of late-implantation. Exposure to CS(2) disturbs expression of MMP-2 and MMP-9 in embryo and uterus tissues, which might be one of the important factors contributed to embryo toxicity induced by CS(2).</p>

Time trends on the prevalence of cancer during 1970 - 2005 in Shandong province / 中华流行病学杂志

Objective To analyze time trend of cancer during 1970-2005 in Shandong province so as to develop strategies for control and prevention of cancer at the community level. Methods Data was from 4 retrospective surveys regarding all causes of death during 1970-- 1974, 1985-1989, 1990- 1992 and 2004-2005, in Shandong province. Other than one set of data collected in 1985-1989 by Shandong province itself, the other 3 set of data were from the national surveys, in which the survey-point sampling of choice was based on data of 1970-1974 for assessing its representativeness. The observing indices would include standardized mortality and mortality. A join-point regression model was used to analyze the changing rate of tumor. Results The mortality rate of the entire tumor increased 143.15 percent in 2005 than in 1970. The changing slope of standardized rate of all tumors in the regression model showed that the inter-annual growth rate were 0.54 and 1.24 percent from 1970 to 1984 and from 1985 to 1992. The rate of increase since 1992 had been 0.18 percent. During 2004-2005, the main malignant cancers were lung, stomach, liver, esophageal, coiorectal, leukemia, breast and cervical cancer, in order. Lung cancer rose from the 4th ranking to the first while cervical cancer dropped from the fifth ranking to the 8th place. Esophageal cancer and cervical cancer were decreased annually while gastric cancer was increased in the early days but decreased later on. The rest of the cancers were on the rise year by year. Rates of lung and breast cancers were higher while gastric and esophageal cancers were lower seen in the urban than in rural areas. Conclusion In Shandong province, a marked increase was seen in the mortality rate of tumors in the past 35 years. Evidence showed that the spectrum of death among main malignant tumors had changed which might provide a scientific basis for the development of a community-based prevention and control program on cancer.

Effects of garlic oil combined with resveratrol on inducting of apoptosis and expression of Fas, bcl-2 and bax in human gastric cancer cell line / 中华预防医学杂志

<p><b>OBJECTIVE</b>To explore the effects of garlic oil combined with resveratrol on the apoptosis and expression of Fas, bcl-2 and bax in human gastric cancer cell line MGC-803.</p><p><b>METHODS</b>The experiment included three groups which were the control group, the combined medicine group 1 (including 25 microg/ml oil garlic and 25 microg/ml resveratrol) and the combined medicine group 2 (including 50 microg/ml oil garlic and 50 microg/ml resveratrol). The apoptosis of cell was examined by DNA gel electrophoresis and flow cytometry for annexin v; the expression of Fas was determined by flow cytometry at the 24th hour after the treatment; the mRNA expression of bcl-2 and Bax gene were measured by RT-PCR method at the 24th ang 48th after treatment, respectively.</p><p><b>RESULTS</b>The garlic oil combined with resveratrol induced cell apoptosis markedly at the 24th after the treatment The protein expression of Fas in the combined medicine groups was 10.59% and 14.16% respectively. As compared with the control group (5.27%), the statistical significance was obvious. The mRNA level of Bax was elevated significantly, however the mRNA expression of bcl-2 was decreased at the 24th and 48th after the treatment.</p><p><b>CONCLUSIONS</b>The garlic oil combined with the resveratrol might obviously induce the apoptosis of gastric cancer cell line MGC-803 which be involved in increasing the expression of Fas protein and bax gene and decreasing the expression of bcl-2 gene at the same time.</p>

Changes of mortality and causes of death from 1970 to 2005 and decomposition analysis in Shandong province / 中华流行病学杂志

Objective To describe the trend of overall mortality and major causes of death in Shandong population from 1970 to 2005,and to quantitatively estimate the influential factors.Methods Trends of overall mortality and major causes of death were described using indicators such as mortality rates and age-adjusted death rates by comparing three large-scale mortality surveys in Shandong province.Difference decomposing method was applied to estimate the contribution of demographic and nondemographic factors for the change of mortality.Results The total mortality had had a slight change since 1970s,but had increased since 1990s.However,both the mortality rates of age-adjusted and age-specific decreased significantly.The mortality of Group Ⅰ diseases including infectious diseases as well maternal and perinatal diseases decreased drastically.By contrast,the mortality of non-communicable chronic diseases (NCDs)including cardiovascular diseases(CVDs),cancer and injuries increased.The sustentation of recent overall mortality was caused by the interaction of demographic and non-demographic factors which worked oppositely.Non-demographic factors were responsible for the decrease of Group Ⅰ disease and the increase of injuries.With respect to the increase of NCDs as a whole.demographic factors might take the full responsibility and the non-demographic factors were the opposite force to reduce the mortality.Nevertheless,for the increase of some leading NCD diseases as CVDs and cancer,the increase was mainly due to non-demographic rather than demographic factors.Conclusion Through the interaction of the aggravation of ageing population and the enhancement of non-demographic effect,the overall mortality in Shandong would maintain a balance or slightly rise in the coming years.Group Ⅰ diseases in Shandong had been effectively under control.Strategies focusing on disease control and prevention should be transferred to chronic diseases,especially leading NCDs,such as CVDs and cancer.

The distribution of the pre-cancerous condition and pathological changes of esophageal cancer of the community residents in high-incidence area / 中华预防医学杂志

<p><b>OBJECTIVE</b>To observe the distribution of the pre-cancerous condition and pathological changes of esophageal cancer of the community residents in high-incidence area, and to provide etiological evidences for secondary prevention.</p><p><b>METHODS</b>An iodine-staining endoscope census was conducted in 9536 residents with high-risk factors at Feicheng, a high esophageal cancer incidence community in Shandong province. Of which, 1507 pathologic biopsies were performed and chi2 test administrated.</p><p><b>RESULTS</b>There was no statistical significance found in biopsy pathologic diagnosis between females and males among 1507 samples. The mild and medium atypical hyperplasia was taken as pre-cancerous condition and severe atypical hyperplasia was taken as pre-cancerous lesion. Taking all the population attending census as denominator, the detection rate of the precancerous state and precancerous lesion were 6.98% (294/4214) and 1.23% (52/4214) for the males, and 3.68% (196/5322) and 0.47% (25/5322) for the females, respectively. A statistical significance was observed when comparing males with females (chi2 were 52.349 and 15.267, respectively, P < 0.05). Analyzed by age group, severe atypical hyperplasia pathological changes were mainly distributed in the age group of 50- and 65-. The constituent ratio between 45 - and 50 - was the highest for CIS. Early carcinoma was mainly distributed in five age groups from 45- to 65-. It showed that high incidence town had a high detection rate of cancer and pathological changes of esophageal cancer in the analysis of urban and rural distribution.</p><p><b>CONCLUSION</b>The distribution of the pre-cancerous state and pathological changes of esophageal cancer of the residents should have provided a scientific basis for the primary and secondary prevention.</p>

Role of serum angiopoietin-2 level in screening for esophageal squamous cell cancer and its precursors / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>Angiopoietin-2 (Ang-2) is one of the critical regulators of tumor angiogenesis. Studies have shown a significant correlation of Ang-2 expression to tumor invasion and metastasis in various human cancers, but little is known about the serum Ang-2 (sAng-2) levels in esophageal squamous cell cancer (ESCC) and its precursors. In this study, we aimed to investigate its role in screening for ESCC and its precursors.</p><p><b>METHODS</b>We carried out a free endoscopic screening in Feicheng City, a high ESCC incidence area in Shandong Province of China. Serum samples were collected as follows: 91 from normal subjects, 44 from patients with esophagitis, 85 from patients with hyperplasia, and 13 from patients with early ESCC. In addition, 28 serum samples were obtained from patients with invasive ESCC undergoing surgery in People's Hospital of Feicheng City. All the subjects of the five groups were diagnosed by histopathology. The sAng-2 levels were tested and compared, and the diagnostic power in early or/and invasive ESCC was calculated in terms of sensitivity and other parameters.</p><p><b>RESULTS</b>The sAng-2 levels were (22.0 +/- 5.5), (21.3 +/- 3.2), (20.5 +/- 3.3), (24.0+/- 5.0), and (29.8 +/- 5.0) U/ml in normal, esophagitis, hyperplasia, early ESCC, and invasive ESCC groups respectively. It was significantly higher in early ESCC than inhyperplasia group (P = 0.009). The invasive ESCC group showed the highest Ang-2 level among all groups (all P = 0.000). The sensitivities of sAng-2 to early and invasive ESCC were 23.1% and 78.6% respectively.</p><p><b>CONCLUSION</b>sAng-2 level is related to carcinogenesis and progression of ESCC, but it can not be used to screen for early ESCC.</p>

The risk factors related to esophageal squamous cell cancer in Feicheng county, China / 中华预防医学杂志

<p><b>OBJECTIVE</b>To investigate the risk factors related to the esophageal squamous cell cancer in Feicheng county in Shandong province.</p><p><b>METHODS</b>A case-control study was carried out in Feicheng county. There were two parts consisted in the cases. 253 cases, aged from 40 to 69 years old, were recruited from the screened endoscopic survey program from January 2004 to December 2006. The other part of cases was recruited from the people's Hospital of Feicheng city. 8159 subjects whose had normal endoscope test result were recruited as the control group. Besides cardiograph and ventral ultrasound examination the screening program also included an endoscope test during which mucosal stain with 1.2% iodine solution. The biopsies were taken from the screen and underwent pathologic evaluation by two pathologists; A self-administrative questionnaire survey was conducted in all the subjects to collect information about smoking, alcohol consumption and dietary. The binary Logistic regression was used to estimate odds ratio (OR) and 95% confidence interval (95% CI). The study protocol was approved by the local ethics committee and the study was conducted with the informed consents of all the study subjects.</p><p><b>RESULTS</b>There were 235 esophageal cancers cases (70 identified in screening program, 183 were hospitalized patients) and 8159 controls in the case-control study. Three potential confounders were detected after univariate analysis. After adjusted the three confounders, age, sex and education, we found, smoking, alcohol drinking were the top ranked risk factors for esophageal cancer. When combing smoking and alcohol drinking, the or was 2.73 (95% CI: 1.54 - 4.82) for male, and the proportional attribute relative risk was 51.47%. We also observed that more dietary cellulose and vitamin C intake have protective effects.</p><p><b>CONCLUSION</b>Smoking and alcohol drinking could increase the risk of esophageal cancer, and taking more dietary cellulose and vitamin C might decrease the risk.</p>

Prevalence of bacterial vaginosis in married women of reproductive age in the rural area of Shandong province and its risk factors / 中国医学科学院学报

<p><b>OBJECTIVE</b>To explore the prevalence of bacterial vaginosis of married women of reproductive age in the rural area of Shandong province and its affecting factors, with an aim to provide references for setting up preventing measures for this disease.</p><p><b>METHODS</b>A stratified, population-based, cluster sampling method was employed. The epidemiological investigation on bacterial vaginosis of married women of reproductive age was carried out at four sampling fields.</p><p><b>RESULTS</b>The prevalence of bacterial vaginosis was 6.64%. The main risk factors included: lacked of personal bathtub and towel; did not use sterilized paper on menstrual phase; had no knowledge that gonorrhea, syphilis, AIDS, and trichomonal vaginitis can be transmitted through sexual intercourse.</p><p><b>CONCLUSION</b>The prevalence of bacterial vaginosis in married women of reproductive age in Shandong rural area is high, which correlates with the lower education level, limited health knowledge, and unhealthy behavior.</p>

Effects of Chinese herbs for supplementing Shen and strengthening bone on IL-6 mediated myelogenic osteoclasts formation of ovariectomized rats in early stage / 中国中西医结合杂志

<p><b>OBJECTIVE</b>To observe the effect of Chinese herbs for supplementing Shen and strengthening bone (HB) on myelogenic osteoclasts formation, and gene expression of interleukin-6 (IL-6), IL-6 receptor (IL-6R) and gp130 in bone marrow.</p><p><b>METHODS</b>Seventy-two healthy female SD rats of 3 months, were randomly divided into three groups, 24 in the sham-operated group (A), 24 in the ovariectomized group (B) and 24 in the after ovariectomy HB treated group (C). Bone marrow cells of 6 rats from each group were respectively collected and cultured at four time points (2nd, 4th, 6th and 12th weeks after operation). After 6 days of culture, the bone marrow cells were differentiated by Wright-Giemsa stain and TRAP stain, and total RNA in them was extracted by TRIZOL.</p><p><b>RESULTS</b>Beginning from the 2nd week, the osteoclasts formation in Group B was higher than that in Group A (P < 0.05), and IL-6, IL-6R gene expression significantly increased in Group B (P < 0.05 or P < 0.01). These changes reached the peak in the 4th to 6th week, with the level maintained to the 12th week. As for comparison of Group B and C, the above-mentioned changes were significantly weakened in the latter (P < 0.05 or P < 0.01). No significant change of gp130 gene expression revealed in the whole course in either group.</p><p><b>CONCLUSION</b>HB could inhibit the myelogenic osteoclasts formation in ovariectomized rats, this effect may be correlated with, partially at least, its inhibitory effect on the over-expressed IL-6 and IL-6R gene expression in myelocytes after ovariectomy.</p>

Study on the long-time effect on allitridum and selenium in prevention of digestive system cancers / 中华流行病学杂志

<p><b>OBJECTIVE</b>To evaluate the long-time effect on allitridum and selenium in preventing cancer of digestive system.</p><p><b>METHODS</b>Persons who were recruited into the intervention group and took allitridum and selenium to prevent gastric cancer in Qixia county of China from 1989-1991 were followed up to 2001 and data of deaths was collected. The long effect on allitridum and selenium in preventing cancer of digestive system was analysed.</p><p><b>RESULTS</b>Data were compared to placebo group five years (1992-1996) after the termination of intervention to have found that the accumulative mortality rate of all cancer, digestive system cancer and gastric cancer had decreased 45.5%, 41.2% and 63.3% in the intervention group respectively. By stratum analysis, accumulative mortality rate of all cancer, digestive system cancer and gastric cancer had decreased 51.5%, 51.5% and 67.7% in males of the intervention group, respectively. Relative risks for males in the intervention group were 0.48, 0.47 and 0.30 times more than the placebo group, respectively. All of them were statistically significant. Relative risks for females in the intervention group were 0.74, 0.92 and 0.70 times more than placebo group. Six to ten years later after the termination of intervention, the accumulative mortality rate and relative risk of all cancers in two groups became similar.</p><p><b>CONCLUSION</b>Allitridum and selenium had the effect of decreasing the incidence risk of digestive cancer with a protective rate more than 50% for five years after the termination of intervention program.</p>

Study on the prevalence of low reproductive tract infection diseases and related risk factors among married women of bearing-age in rural area of Shandong province / 中华流行病学杂志

<p><b>OBJECTIVE</b>To study the prevalence of child-bearing age women with reproductive tract infection (RTI) and related risk factors in the rural area of Shandong so as to develop measurements on prevention.</p><p><b>METHODS</b>Four communities were randomly selected based on economic levels and a baseline investigation on RTI was carried out.</p><p><b>RESULTS</b>A total prevalence rate of RTI was 47.57% with breakdown for four communities-Zhucheng, Zhangqiu, Daiyue and Wudi as 53.91%, 41.49%, 48.37%, 44.88% respectively. Nearly 60% of women at child-bearing age were ignorant on sexually transmitted diseases (STD). Risk factors of RTI would include incorrect perineum cleanout, bad habit of sexual intercourse and low education level of the husbands.</p><p><b>CONCLUSION</b>High prevalence of RTI was associated with low level of education, lack of awareness on STD related hygiene and low rate of seeing doctor for RTI disorder in those women. The results of this study would benefit to the development of intervention measurement of RTI.</p>

Effect of carbon disulfide exposure at different phases on the embryonic development in mid-pregnancy of female mice / 中华劳动卫生职业病杂志

<p><b>OBJECTIVE</b>To explore the sensitive point of embryotoxicity of carbon disulphide on female mice.</p><p><b>METHODS</b>At the phases of follicle developing, implanting and post-implantation of blastocyst, female mice were injected intraperitoneally with carbon disulphide 631.4 mg/kg per day for three days while controls with plant oil. All indexes were detected at the fourteenth day of pregnancy.</p><p><b>RESULTS</b>(1) In follicle developing CS(2) exposed group, the weight of embryos fossa [(1.23 +/- 0.36) g was 41% less than that in controls [(2.08 +/- 0.48) g, P = 0.000], and in implanting CS(2) exposed group the weight of embryo fossa, and embryos [(1.27 +/- 0.97) g, and (0.12 +/- 0.09) g respectively] were 39% and 37% less than those in controls [(2.08 +/- 0.48), (0.19 +/- 0.06) g, P = 0.068, P = 0.045]; (2) In both follicle developing and implanting CS(2) exposed group, the weights of uterus and placenta were also less than those in controls (P < 0.01). (3) In post-implantation CS(2) exposed group, the above parameters were not significantly different from those in controls.</p><p><b>CONCLUSION</b>Follicle developing phase as well as implanting of blastocyst may be sensitive point for embryotoxicity induced by carbon disulphide.</p>

An intervention study to prevent gastric cancer by micro-selenium and large dose of allitridum / 中华医学杂志(英文版)

<p><b>BACKGROUND</b>People have more and more concerned about allitridum as studies have shown that taking more raw garlic associated with a lower risk for cancers of the alimentary system. In the present study, we tried to examine whether a large dose of allitridum and a microdose of selenium prevent gastric cancer.</p><p><b>METHODS</b>A double-blind intervention study was performed on the participants aged (35 - 74) years, who had matched at least one of the following criteria: (1) a medical history of stomach disorder, (2) a family history of tumour, or (3) smoking and/or alcohol consumption. A total of 2,526 and 2,507 persons were randomly enrolled into intervention group and control group respectively from 288 natural villages of seven communities in Qixia County, Shandong Province, China. Each person of the intervention group orally took 200 mg synthetic allitridum every day and 100 microg selenium every other day for one month of each year during November 1989 to December 1991. At the same time, people in control group were given 2 placebo capsules containing corn oid with the identical appearance to that in the intervention group.</p><p><b>RESULTS</b>For all subjects the large dose of allitridum was accepted and no harmful side effects were found during the study. In the first follow-up five years (1992 - 1997) after stopping the intervention, the morbidity rates of malignant tumours in the intervention group declined by 22%, in contrast to the control group, declined by 47.3%. After adjusting for age, gender, and other potential confounders, relative risks (RRs) for all tumours and gastric cancer of the whole population were 0.67 (95% CL: 0.43 - 1.03) and 0.48 (95% CL: 0.21 - 1.06), respectively, and for male group they were 0.51 (95% CL: 0.30 - 0.85) and 0.36 (95% CL: 0.14 - 0.92), respectively. No signigicantly protective effect was found for the female subgroup.</p><p><b>CONCLUSION</b>The present study proves that large doses of allitridum and microdorse of selenium may effectively prevent gastric cancer, especially in men.</p>

Sample size requirements for association studies on gene-gene interaction in case-control study / 中华流行病学杂志

<p><b>OBJECTIVE</b>Sample size requirements for association studies on gene-gene interaction in case-control study.</p><p><b>METHODS</b>Selecting different parameters (such as inheritance mode, susceptibility frequency, frequency of allele for disease, OR of gene main effect) and infilling them into QUANTO software based on conditional logistic regression mode.</p><p><b>RESULTS</b>(1) The main parameters influencing the sample size requirements were the levels of interaction between genes and the susceptibility frequency. The numbers of sample were the same between recessive and dominant when susceptibility frequency were the same. (2) Sample size for testing of gene-gene interaction was different from that for testing of genetic effects.</p><p><b>CONCLUSION</b>It was convenient to use the numbers of sample size from the results for gene-gene interaction in case-control study.</p>

Study on the molecular mechanism of apoptosis in esophageal cancer cells induced by soybean isoflavone / 中华流行病学杂志

<p><b>OBJECTIVE</b>To investigate the function of apoptosis in esophageal cancer cells induced by soybean isoflavone, and the relation between this apoptosis and expression of bcl-2 and bax.</p><p><b>METHODS</b>In vitro experiments, MTT assay was used to determine the cell growth inhibitory rate. Transmission electron microscope and TUNEL staining method were used to quantitatively and qualitatively detect the apoptosis status of esophageal cancer cell line EC-9706 before and after the soybean isoflavone treatment. Immunohistochemical staining and reverse transcription-polymerase chain reaction were used to detect the expression of apoptosis-regulated gene bcl-2 and bax.</p><p><b>RESULTS</b>Soybean isoflavone inhibited the growth of esophageal cancer cell line EC-9706 in a dose- and time-dependent manner. Soybean isoflavone induced EC-9706 cells to undergo apoptosis with typically apoptotic characteristics, including morphological changes of chromatin condensation, chromatin crescent formation, nucleus fragmentation and apoptotic body formation by transmission electron microscope and staining positive cells, using TUNEL assay. Soybean isoflavone reduced the expression of apoptosis-regulated gene bcl-2, and improving the expression of apoptosis-regulated gene bax.</p><p><b>CONCLUSION</b>Soybean isoflavone seemed to be able to induce the apoptosis in esophageal cancer. This type of apoptosis might be mediated by down-expression of apoptosis-regulated gene bcl-2 and up-expression of apoptosis-regulated gene bax.</p>

LIPASE-CATALYZED ENANTIOSELECTIVE AMMONOLYSIS OF (?)-?- METHYLBENZYL ACETATE IN MICROAQUEOUS PHASE / 微生物学通报

Novozym 435 was selected from four lipases and two proteinase because of its high catalytic activity and enantiosectivity.For the ammonolysis of (?)-?-methylbenzyl acetate,The effect of ammonia sources,the concentration of enzyme and substrates on the reaction were further explored .under the optimum conditions of this study,after 6h reaction,with the enantiomeric excess of the remaining (-)-?-methylbenzyl acetate was found to be higher than 99%.

EFFECT OF MICROENVIRENMENT ON LIPASE-CATALYZED ENANTIOSEL-ECTIVE AMMONOLYSIS OF (?) -?-METHYLBENZYL ACETATE / 微生物学通报

The effects of reaction media, water activity, temperature and pH on Novozym 435-catalyzed enantiose-lective ammonolysis of (?) -?-methylbenzyl acetate have been systematically explored. Novozym 435 showed high catalytic activity and enantioselectivity in hexane; the optimum temperature and the initial water activity were 25℃ and 0.33 respectively; The suitable reaction pH was in the range of 6.0 - 7.0.