Microplastics enhance the developmental toxicity of synthetic phenolic antioxidants by disturbing the thyroid function and metabolism in developing zebrafish

Coexposure of MPs and other contaminants adsorbed from the environment has raised many attentions, but the understanding of the combined effects of MPs and plastic additives are limited. Butylated hydroxyanisole (BHA), a widely used synthetic phenolic antioxidant in plastics, has gained high concerns due to their unintended environmental release and potential threat to aquatic organisms. This study was conducted to reveal the influences of MPs on the bioaccumulation and developmental toxicity of BHA in zebrafish larvae. As a result, MPs promoted the accumulation of BHA in zebrafish larvae and enhanced the toxicity of BHA in larvae development manifested by reduced hatching rates, increased malformation rates and decreased calcified vertebrae. Although the concentration of MPs was not sufficient to cause obvious developmental toxicity, the impacts of MPs on thyroid hormones status might contribute to the aggravated join toxicity. The metabolomic mechanism was revealed to be that the coexposure of BHA and MPs affected the development of zebrafish larvae via disturbing the metabolism of arachidonic acid, glycerophospholipid, and lipids. Our results emphasized that MPs, even at the nontoxic concentrations, in combination with additives caused health risk that should not be ignored.

[Effect of data missing on population based viral load survey in HIV infected men who have sex with men sampled in 16 large cities, China]

Objective: To analyze the effect of missing data in population based viral load (PVL) survey in HIV infected men who have sex with men (MSM) sampled in 16 cities in China. Methods: The database of 3 virus load sampling survey conducted consecutively in HIV infected MSM population in 16 large cities (Beijing, Shanghai, Nanjing, Hangzhou, Wuhan, Chongqing, Kunming, Xi'an, Guangzhou, Shenzhen, Nanning, Urumuqi, Harbin, Changchun, Chengdu and Tianjin) during 2013-2015 was used. SPSS 17.0 software was used to describe distribution of the missing data and analyze associated factors. Results: A total of 12 150 HIV infected MSM were randomly selected for the surveys, in whom, 9 141 (75.2%) received virus load tests, while 3 009 (24.8%) received no virus load tests, whose virus load data missed. The virus load data missing rates in MSM with or without access to antiretroviral therapy (ART) were 11.5% (765/6 675) and 39.4% (2 060/5 223) respectively, and the virus load data missing rates were 21.9% (1 866/8 523) and 28.4% (959/3 374), respectively, in local residents and non-local residents (migrants). Conclusions: The analysis indicated that the data missing occurred in the virus load survey in HIV infected MSM population. ART status and census registering status were the main influencing factors. Data missing could influence the accurate evaluation of community viral load (CVL) and population viral load(PVL) levels in HIV infected MSM in China.

[The MRI analysis of 220 cases of placenta previa complicated with placenta accrete or not]

Objective: To investigate the diagnostic value of MRI for placenta previa complicated with placenta accreta or not. Methods: A total of 220 placenta previa patients were diagnosed by prenatal ultrasound and MRI in The Second Affiliated Hospital of Wenzhou Medical University from May 2014 to May 2017.The MRI images of 220 placenta previa patients suspicious of placenta previa were interpreted by two radiologists who majored on gynecological radiology. The sensitivity, specificity, accuracy, positive predictive value and negative predictive value of two radiologists in diagnosis of placenta accreta were calculated respectively. Kappa test were used to verify the consistency between two doctors, as well as their MRI diagnosis and pathological results. The diagnostic value of MRI and pathological were assessed by Chi-square test and receiver operating characteristic (ROC)curve. Results: The 220 patients were all confirmed with placenta previa by surgical pathology.Out of 220, 71 cases were diagnosed as placenta accreta, and 149 cases were diagnosed without placenta accreta. The sensitivity, specificity, accuracy, positive predictive value and negative predictive value with physician A and physician B were 90.1%/84.5%, 88.6%/89.9%, 89.1%/88.2%, 79.0%/80.0% and 95.0%/92.4%, respectively.The consistency between MRI diagnosis and pathological results was excellent in physician A (κ=0.759), and good in physician B (κ=0.734). However, the sensitivity, specificity and accuracy of diagnosis between two physicians had no significant difference (all P>0.05). The area under the curve (AUC) of ROC in physician A and B were 0.858 and 0.847 (P=0.980). Conclusion: MRI is feasible for patients with placenta previa, as the sensitivity, specificity and accuracy of MRI are high in assessing whether placenta previa complicated with placenta accreta or not.

[Recombinant human tumor necrosis factor receptor type Ⅱ-IgG Fc fusion protein for treatment of occupational medicamentosa-like dermatitis induced by trichloroethylene]

Objective: To investigate the efficacy and safety of the recombinant human tumor necrosis factor receptor Ⅱ-IgG Fc fusion protein (rhTNFR: Fc, etanercept) for the treatment of occupational medicamentosa-like dermatitis induced by trichloroethylene (OMLDT) . Methods: In September 2011 to February 2016, 12 patients with OMLDT were treated with etanercept 25 mg, subcutaneous injection, twice per week, doubling of first dose. The course of treatment was 6 weeks. The drug eruption area and severity index (DASI) score, the proportion of patients achieving a 50%, 75% and 90% reduction in DASI (DASI50, DASI75, DASI90) and the serum level of TNF-α were used to assess the efficacy at different times. Adverse reactions were also recorded and evaluated. The results were statistically analyzed by nonparametric Friedman test and repetitive measurement ANOVA using the software SPSS19.0. Results: After 4 weeks treatment, the DASI score decreased form 56.33±7.02 to 0.50±0.91 (P<0.01) . The DASI50, DASI75 and DASI90 were all increased to 12 (100%) . The serum level of TNF-α decreased form (43.74±41.62) pg/ml to (3.03±0.47) pg/ml (P<0.01) . Statistically significant difference was observed from the above indexes. There were no adverse reactions in clinical application. Conclusion: Recombinant human tumor necrosis factor receptor Ⅱ-IgG Fc fusion protein may be a safe and effective drug in the treatment of OMLDT.

[Diffusion-weighted imaging characteristics of uterine leiomyomas with different pathological subtypes at 3.0 T]

OBJECTIVE

To investigate the imaging features of uterine leiomyomas with different pathological subtypes on DWI.

METHODS

Clinical records and MR images of pathologically confirmed uterine leiomyomas were retrospectively collected from the Second Affiliated Hospital of Wenzhou Medical University from June 2012 to April 2015. A total of 60 uterine leiomyomas were found and evaluated.All the patients were divided into three groups according to different pathological types, which included 17 cases of cellular leiomyomas, 10 cases of degenerated leiomyomas and 33 cases of ordinary leiomyomas.The DWI signal and ADC values in cellular portion of the lesions and adjacent normal myometrium (the control group) were measured.

RESULTS

(1) Most cellular leiomyomas showed hyperintensity on DWI (15/17), while degenerated leiomyomas manifested hypointensity, isointensity or hyperintensity signal on DWI, and most ordinary leiomyomas displayed isointensity signal on DWI (57.6%, 19/33). (2) The ADC values of cellular leiomyomas, degenerated leiomyomas and ordinary leiomyomas were (1.01±0.14)×10(-3) mm(2)/s, (1.73±0.49)×10(-3) mm(2)/s and (1.38±0.22)×10(-3) mm(2)/s respectively.The ADC values of adjacent normal myometrium (the control group) were (1.35±0.16)×10(-3) mm(2)/s.There were no significant statistical differences in the ADC values between ordinary leiomyomas and adjacent normal myometrium (P=0.623). There were significant statistical differences in the ADC values among other groups(all P<0.05). (3)The ROC curve showed that the diagnostic threshold for cellular leiomyomas was 1.11×10(-3) mm(2)/s, the sensitivity and specificity were 88.2%and 93.0% respectively.

CONCLUSION

The signal intensity on DWI and the ADC values are different in uterine leiomyomas with different pathological subtypes.Combination of these two parameters in clinical practice may be helpful to reflect the histopathological characteristics of uterine leiomyomas.

TaALMT1 promoter sequence compositions, acid tolerance, and Al tolerance in wheat cultivars and landraces from Sichuan in China

Previous genetic studies on wheat from various sources have indicated that aluminum (Al) tolerance may have originated independently in USA, Brazil, and China. Here, TaALMT1 promoter sequences of 92 landraces and cultivars from Sichuan, China, were sequenced. Five promoter types (I', II, III, IV, and V) were observed in 39 cultivars, and only three promoter types (I, II, and III) were observed in 53 landraces. Among the wheat collections worldwide, only the Chinese Spring (CS) landrace native to Sichuan, China, carried the TaALMT1 promoter type III. Besides CS, two other Sichuan-bred landraces and six cultivars with TaALMT1 promoter type III were identified in this study. In the phylogenetic tree constructed based on the TaALMT1 promoter sequences, type III formed a separate branch, which was supported by a high bootstrap value. It is likely that TaALMT1 promoter type III originated from Sichuan-bred wheat landraces of China. In addition, the landraces with promoter type I showed the lowest Al tolerance among all landraces and cultivars. Furthermore, the cultivars with promoter type IV showed better Al tolerance than landraces with promoter type II. A comparison of acid tolerance and Al tolerance between cultivars and landraces showed that the landraces had better acid tolerance than the cultivars, whereas the cultivars showed better Al tolerance than the landraces. Moreover, significant difference in Al tolerance was also observed between the cultivars raised by the National Ministry of Agriculture and by Sichuan Province. Among the landraces from different regions, those from the East showed better acid tolerance and Al tolerance than those from the South and West of Sichuan. Additional Al-tolerant and acid-tolerant wheat lines were also identified.

Assessment of in vivo estrogenic response and the identification of environmental estrogens in the Yangtze River (Nanjing section)

Environmental estrogens in the aquatic environment have been shown to be responsible for the feminization of fish. The estrogenic content of the Yangtze River (Nanjing section--referred to as the studied area herein) was assessed using a combination of bioassay and chemical analysis. The in vivo bioassay was conducted by exposing adult male goldfish (Carassius auratus) to different concentrations of river water (25%, 50% and 100%) sampled from three representative sections of the studied area. Chemical analysis of estrogens in water from the three representative sections was conducted using solid phase extraction-gas chromatograph (SPE-GC) detection. The assay showed significant serum vitellogenin (VTG) and 17beta-estradiol (E2) induction and gonad atrophy in the treated fish. The strength of in vivo estrogenic responses in the three representative sections is in the order of Jiangxinzhou section>Daqiao section>Sanchahe section. The result is consistent with the levels of water estrogens determined from the chemical analysis. Steroidal estrogens were the major causal agents responsible for the estrogenic responses in the Jiangxinzhou and Daqiao sections, while phenolic estrogens were the main contributors in the Sanchahe section. The results of these in vivo bioassay and chemical analysis demonstrate that fish in the Yangtze River are exposed to environmental estrogens and are at a risk of feminization.

Characterization of alpha-gliadin genes from diploid wheats and the comparative analysis with those from polyploid wheats

To carry out the comparative analysis of alpha-gliadin genes on A genomes of diploid and polyploid wheats, 8 full-length alpha-gliadin genes, including 3 functional genes and 5 pseudogenes, were obtained from diploid wheats, among which 2, 2 and 4 alpha-gliadin genes were isolated from T. urartu, T. monococcum and T. boeoticum, respectively. The results indicated that higher number of alpha-gliadin pseudogenes have been present in diploid wheats before the formation of polyploid wheats. Amino acid sequence comparative analysis among 26 alpha-gliadin genes, including 16 functional genes and 10 pseudogenes, from diploid and polyploid wheats was conducted. The results indicated that all alpha-gliadins contained four coeliac toxic peptide sequences (i.e., PSQQ, QQQP, QQPY and QPYP). The polyglutamine domains are highly variable, and the second polyglutamine stretch is usually disrupted by the lysine or arginine residue at the fourth position. The unique domain I is the most conserved domain. There are 4 and 2 conserved cysteine residues in the unique domains I and II, respectively. Comparative analysis indicated that the functional alpha-gliadin genes from A genome are highly conserved, whereas the identity of pseudogenes in diploid wheats are higher than those in hexaploid wheats. Phylogenetic analysis indicated that all the analyzed functional alpha-gliadin genes could be clustered into two major groups, among which one group could be further divided into 5 subgroups. The origin of alpha-gliadin pseudogene and functional genes were also discussed.

[Biochemical and molecular characterization of gliadins]

Gliadins account for about 40-50% of the total proteins in wheat seeds and play an important role on the nutritional and processing quality of flour. Usually, gliadins could be divided into alpha- (alpha/beta-), gamma- and omega-groups, whereas the low-molecular-weigh (LMW) gliadins were novel seed storage proteins. The low-molecular-weight glutenin subunits (LMW-GSs) were also designated as gliadins in a few literatures. The genes encoding gliadins were mainly located on the short arms of group 6 and group 1 chromosomes, and not evenly distributed. Repetitive sequences covered most of un-coding regions, which attributed greatly to the evolution of wheat genome. Primary structure of each gliadin has been divided into several domains, and the long repetitive domains consisted of peptide motifs. Conserved cysteine residues mainly formed intramolecular disulphide bonds. The rare potential intermolecular disulphide bonds and the long repetitive domains played an important role in the wheat flour quality. There was a general idea that gliadin genes, even prolamin genes, have a common origin and subsequent divergence lead to the gene polymorphism. The gamma-gliadins have been considered to be the most ancient of the wheat prolamin family. Several elements in the 5'-flanking (e.g. CAAT and TATA box) and the 3'-flanking sequences had been detected, which had been shown necessary for the proper expression of gliadins.

Genetic diversity of Triticum turgidum L. based on microsatellite markers

Using microsatellite (SSR) markers, the genetic diversity and genetic relationships among 48 Triticum turgidum L. accessions, including 30 Triticum turgidum L. ssp. turgidum, 7 Triticum turgidum L. ssp. durum, 4 Triticum turgidum L. ssp. carthlicum, 3 Triticum turgidum L. ssp. paleocolchicum, 2 Triticum turgidum L. ssp. turanicum and 2 Triticum turgidum L. ssp. polonicum accessions, were investigated. A total of 97 alleles were detected on 16 SSR loci. At each locus, the number of alleles ranged from 2 to 14, with an average of 6.1. The Genetic similarity (GS) value ranged from 0.20 to 0.92, with the mean of 0.59. In cluster analysis, it was found the 48 Triticum turgidum L. accessions could be distinguished easily by SSR markers, whereas the 6 subspecies taxonomic entities of T. turgidum L. could not differentiate with each other, indicating that the morphological differences present among the 6 subspecies could not be reflected by the SSR markers. These results suggested that SSR markers had the superiority in detecting the genetic diversity of T. turgidum L., while it was not good for the studies of the phylogenic relationships among the subspecies of T. turgidum L.

Identification of LMW glutenin-like genes from Secale sylvestre host

Three low-molecular-weight (LMW) glutenin-like genes (designated as Ssy1, Ssy2 and Ssy3) from Secale sylvestre Host were isolated and characterized. The three genes consist of a predicted highly conservative signal peptide with 20 amino acids, a short N-terminal region with 13 amino acids, a highly variable repetitive domain and a less variable C-terminal domain. The deduced amino acid sequences of the three genes were the LMW-m type due to a methionine residue at the N-terminus. The phylogenic analysis indicated that the prolamin genes could be perfectly clustered into five groups, including HMW-GS, LMW-GS, alpha/beta-, gamma- and omega-prolamin. The LMW glutenin-like genes of S. sylvestre were more orthologous with the LMW-GS genes of wheat and B hordein genes of barley, which also had been confirmed by the homology analysis with the LMW-GS of wheat at Glu-A3, Glu-B3 and Glu-D3 loci. These results indicated that a chromosome locus (designated as Glu-R3) might be located on the R genome of S. sylvestre with the functions similar to the Glu-3 locus in wheat and its related species.

Regulation of peroxisome proliferator-activated receptor alpha-induced transactivation by the nuclear orphan receptor TAK1/TR4

Recently, we reported the cloning of the nuclear orphan receptor TAK1. In this study, we characterized the sequence requirements for optimal TAK1 binding and analyzed the repression of the peroxisome proliferator-activated receptor alpha (PPARalpha) signaling pathway by TAK1. Site selection analysis showed that TAK1 has the greatest affinity for direct repeat-1 response elements (RE) containing AGGTCAAAGGTCA (TAK1-RE) to which it binds as a homodimer. TAK1 is a very weak inducer of TAK1-RE-dependent transcriptional activation. We observed that TAK1, as PPARalpha, is expressed within rat hepatocytes and is able to bind the peroxisome proliferator response elements (PPREs) present in the promoter of the PPARalpha target genes rat enoyl-CoA hydratase (HD) and peroxisomal fatty acyl-CoA oxidase (ACOX). TAK1 is unable to induce PPRE-dependent transcriptional activation and represses PPARalpha-mediated transactivation through these elements in a dose-dependent manner. Two-hybrid analysis showed that TAK1 does not form heterodimers with either PPARalpha or retinoid X receptor (RXRalpha), indicating that this repression does not involve a mechanism by which TAK1 titrates out PPARalpha or RXRalpha from PPAR.RXR complexes. Further studies demonstrated that the PPARalpha ligand 8(S)-hydroxyeicosatetraenoic acid strongly promotes the interaction of PPARalpha with the co-activator RIP-140 but decreases the interaction of PPARalpha with the co-repressor SMRT. In contrast, TAK1 interacts with RIP-140 but not with SMRT and competes with PPARalpha for RIP-140 binding. These observations indicated that the antagonistic effects of TAK1 on PPARalpha.RXRalpha transactivation act at least at two levels in the PPARalpha signaling pathway: competition of TAK1 with PPARalpha.RXR for binding to PPREs as well as to common co-activators, such as RIP-140. Our results suggest an important role for TAK1 in modulating PPARalpha-controlled gene expression in hepatocytes.

Induction of the nuclear orphan receptor RORgamma during adipocyte differentiation of D1 and 3T3-L1 cells

Here, we analyzed the expression of the three members of the retinoid-like orphan receptor (ROR) nuclear receptor subfamily during adipocyte differentiation. RORalpha and RORgamma mRNA were upregulated during adipocyte differentiation in preadipocyte D1 and 3T3-L1 cells, whereas RORbeta mRNA could not be detected. The induction of RORalpha and RORgamma mRNA succeeded the induction of peroxisome proliferator-activated receptor gamma (PPARgamma) and CCAAT/enhancer binding protein alpha and occurred at a similar time interval as did the increase in aP2 and lipoprotein lipase mRNA. Like the expression of PPARgamma and aP2, the induction of RORgamma mRNA was repressed by tumor necrosis factor alpha and transforming growth factor beta. The induction of adipogenesis by prostaglandin D2 and two thiazolidinediones in the multipotent stem cells C3H10T1/2 was also accompanied by an induction in RORgamma mRNA. In contrast to parental cells, clofibrate induces adipogenesis and RORalpha and RORgamma mRNA in BALB/c3T3 cells that ectopically express PPARgamma. RORgamma mediates its effect on transcription through specific response elements. Cotransfection of RORalpha or RORgamma and (RORgamma response element)4-chloramphenicol acetyltransferase into preadipocyte D1 cells induced transactivation of chloramphenicol acetyltransferase about 100-fold, suggesting that ROR plays a role in the regulation of gene expression in adipocytes. The nuclear orphan receptor Rev-ErbAalpha, which did not exhibit transactivation function, was able to inhibit transactivation by RORgamma at two different levels. Our results show that RORgamma is induced during adipocyte differentiation in D1 and 3T3-L1 cells and functions as an active transcription factor, suggesting a role for RORgamma in the regulation of gene expression during this differentiation process.

Characterization of the response element and DNA binding properties of the nuclear orphan receptor germ cell nuclear factor/retinoid receptor-related testis-associated receptor

Recently, we have reported the cloning of the germ cell-specific, nuclear orphan receptor germ cell nuclear factor (GCNF)/RTR. In this study, we characterize the RTR response elements by an electrophoretic mobility shift assay/polymerase chain reaction-based, DNA binding site selection strategy. RTR binds with the greatest affinity to response elements containing TCA(AG(G/T)TCA)2 (consensus RTR response element; conRTRE), to which it binds as a homodimer. RTR is also able to bind as a monomer to a single core motif TCAAG(G/T)TCA, albeit with a lower affinity. Mutation analysis supports the specific requirements of the 5'-flanking sequence and the core motif of the RTRE for optimal binding of RTR. An RTR-specific antiserum (RTR-Ab2) was raised that causes supershift of the RTR-conRTRE complex in EMSA. Based on the sequence of the conRTRE, we located a putative RTRE, referred to as P2-RE, in the 5' promoter-flanking region of the mouse protamine 2 gene, which is induced during the same stage of spermatogenesis as RTR. The ability of RTR-Ab2 to cause a supershift of an RTR-RTRE complex with nuclear extracts from different tissues correlated with the tissue- and development-specific expression of RTR. Transfection of RTR in CV-1 cells was unable to cause RTRE-dependent transactivation of a CAT reporter gene; however, an RTR-VP16 fusion protein could induce transactivation through several RTREs, including P2-RE.

Cloning of a cDNA encoding the murine orphan receptor RZR/ROR gamma and characterization of its response element

In this study, we describe the cloning of the mouse homologue of the orphan receptor, RZR/ROR gamma, a member of the nuclear receptor superfamily, from a mouse muscle cDNA library. The amino acid sequence of mouse ROR gamma (mROR gamma) is highly homologous to that of human ROR gamma, with an overall identity of 88%. Northern blot analysis using RNA from different tissues showed that mROR gamma was found to be highly expressed in skeletal muscle, liver and kidney. Analysis of the ROR gamma-response element using in vitro synthesized ROR gamma revealed that it binds as a monomer to response elements composed of a single core motif GGTCA preceded by a 6 bp AT-rich sequence. The ROR gamma-binding specificity was further defined by mutational analysis of the consensus RORE. ROR gamma was able to activate RORE-dependent transcription of the CAT reporter gene in mouse fibroblast D1 cells. ROR alpha 1 and ROR gamma inhibit the transactivation induced by GAL4(DBD)-ROR gamma in fibroblast D1 cells suggesting that these receptors compete for binding to the same coactivators.

Retinoic acid induction of the tissue transglutaminase promoter is mediated by a novel response element

We recently cloned and sequenced two kilobases of the upstream flanking region of the mouse tissue transglutaminase gene. Transfection experiments showed that this region of the transglutaminase flanking sequence was sufficient to mediate a 4-fold induction in reporter gene expression by retinoic acid. The goal of these studies was to identify retinoid receptor binding sites within this proximal 2 kilobase sequence and then to determine if these binding sites had ligand-dependent enhancer activity. To accomplish this we first employed a competitive band-shift assay using PCR-synthesized genomic DNA fragments as probes. This assay identified a receptor binding site located 1.7 Kb upstream from the transcription start site that contained three consensus hexanucleotide 'half sites' separated by 7 and 5 bp, respectively. This tripartite response element was shown to mediate retinoic acid activation of a heterologous promoter in transient transfection assays in RAW264.7 cells. Our results suggest that this novel retinoid response element is responsible for the retinoic acid induction of mouse tissue transglutaminase gene expression observed in numerous cells.

Identification and characterization of a versatile retinoid response element (retinoic acid receptor response element-retinoid X receptor response element) in the mouse tissue transglutaminase gene promoter

Tissue transglutaminase (transglutaminase type II) is an intracellular protein cross-linking enzyme that accumulates in connective tissue and in cells undergoing apoptosis. Retinoids regulate the transcription of the mouse tissue transglutaminase gene via activation of regulatory elements contained within 4 kilobases of the 5'-end of the gene. Co-transfection studies with retinoid receptor expression vectors in CV-1 cells demonstrated that the mouse tissue transglutaminase promoter is activated by ligand activation of either retinoic acid receptor-retinoid X receptor (RAR.RXR) heterodimers or RXR homodimers. Optimal induction is achieved with retinoid receptor panagonists; partial activation can also be achieved with either RAR-specific or RXR-specific retinoids. Retinoid-dependent activation of the tissue transglutaminase promoter depends on both a proximal regulatory region containing sequences highly conserved between the human and the mouse tissue transglutaminase promoters and a distal region that includes a 30-base pair retinoid response element (mTGRRE1). mTGRRE1 contains three hexanucleotide half-sites (two canonical and one non-canonical) in a DR7/DR5 motif that bind both RAR*RXR heterodimers and RXR homodimers. These studies suggest that retinoid-dependent expression of the mouse tissue transglutaminase gene is mediated by a versatile tripartite retinoid response element located 1.7 kilobases upstream of the transcription start site.

[Effects of beta-endorphin on blood pressure and heart rate in rats]

The present work was undertake to investigate the mechanism of changes of blood pressure and heart rate induced by beta-endorphin (beta-End) after microinjection into the Nucleus Amygdaloideus Centralis (AC) of anaesthetized rats. The results were as follows: (1) beta-End (100, 250 pg/microliters) injected into AC decreased both blood pressure and heart rate. (2) Both these effects could be antagonized by naloxone and beta-End anti-serum. (3) The effects of beta-End could also be reversed by phentolamine and propranolol. The results showed that the cardiovascular effects on beta-End were mediated by opioid receptors and through the intervention of adrenergic neurons.

[Clinical and pathological characteristics of Helicobacter pylori-associated chronic gastritis]

To define the clinical and pathological characteristics of Helicobacter pylori-associated gastritis, 173 patients with chronic gastritis, including 99 Hp-positive and 74 Hp-negative patients were studied. We found that there were no significant differences between Hp-positive and Hp-negative patients with regard to clinical symptoms, gastric acid secretion and serum basal gastrin level, whereas the grades of chronic gastritis and active gastritis were markedly higher in Hp-positive patients. 91.2% of patients with active gastritis had evidence of Hp infection. With the increase in Hp density, the proportion of high grades (II and III) gastritis tended to increase, especially the severe active gastritis. In addition, glandular atrophy and intestinal metaplasia in antral mucosa were significantly commoner in Hp-positive patients. There were no significant differences between the two groups in duodenogastric reflux rate, but the reflux rate over moderate degree in Hp-positive patients (19.59%) was somewhat lower that in Hp-negative patients (36.36%) (P = 0.09).

Messenger RNA intron in the nuclear 18s ribosomal RNA gene of deuteromycetes

Introns within messenger RNA genes have characteristic border sequences and a conserved region near the 3' end of the intron. All are involved in splicing to produce the mature mRNA. Introns in ribosomal RNA genes have less well-defined borders and contain no internal conservation. We report here mRNA-type introns located near the 3' end of the 18s rRNA genes of the deuteromycetes Phialophora americana and Cenococcum geophilum. Inserted sequences of various sizes have also been located at the same point in several other deuteromycete species.