Chiari malformation caused by craniometaphyseal dysplasia: case report and review of literature

Chiari malformation is commonly considered a congenital condition. To our knowledge, reports of progressively symptomatic Chiari Iota malformation with craniometaphyseal dysplasia are rare. The authors present a case of progressively symptomatic Chiari Iota malformation occurring in an 11-month-old infant with craniometaphyseal dysplasia. The patient presented with a typical facial appearance and radiological skeletal survey. Posterior fossa decompression was performed. In the meantime, the patient was given Rocaltrol (calcitriol) and adopted a low calcium diet. His neurological symptoms were markedly improved after surgery. The clinical presentations, radiographical features and prognosis of the patient are discussed with reference to the literature.

A guanylyl cyclase-like gene is associated with Gibberella ear rot resistance in maize (Zea mays L.)

Gibberella ear rot, caused by the fungal pathogen Fusarium graminearum Schwabe, is a serious disease of maize (Zea mays L.) grown in northern climates. The infected maize grain contains toxins that are very harmful to livestock and humans. A maize gene that encodes a putative 267-amino acid guanylyl cyclase-like protein (ZmGC1) was characterized and shown to be associated with resistance to this disease. The putative ZmGC1 amino acid sequence is 53% identical and 65% similar to AtGC1, an Arabidopsis guanylyl cyclase. The Zmgc1 coding sequence is nearly identical in a Gibberella ear rot-resistant line (CO387) and a susceptible line (CG62) but several nucleotide sequence differences were observed in the UTRs and introns of the two alleles. Using a 463 bp probe derived from the CG62 allele of Zmgc1 and a recombinant inbred (RI) mapping population developed from a CG62 x CO387 cross, six Zmgc1 restriction fragment length polymorphism (RFLP) fragments (ER1_1, ER1_2, ER1_3, ER1_4, ER1_5, and ER5_1) were mapped on maize chromosomes 2, 3, 7, and 8. Markers ER1_1 and ER5_1 on chromosomes 7 and 8, respectively, were significantly associated with Gibberella ear rot resistance, each in three different environments. The amount of Zmgc1 transcript in ear tissues increased more quickly and to a greater extent in the resistant genotype compared to the susceptible genotype after inoculation with F. graminearum. Zmgc1 is the first guanylyl cyclase gene characterized in maize and the first gene found to be associated with Gibberella ear rot resistance in this plant.

First Report of Five Sooty Blotch and Flyspeck Fungi on Prunus americana in the United States

The sooty blotch and flyspeck (SBFS) complex includes more than 30 fungi that blemish the cuticle of apple fruit, causing economic losses in humid regions worldwide (1). In August 2005, we sampled SBFS-infested wild plum (Prunus americana) fruit growing in hedgerows in Iowa. Colonies were categorized according to mycelial type (1), and isolates were made from representative colonies onto acidified water agar (AWA). Plum skins with SBFS signs were excised, pressed, and photographed. DNA was obtained from purified isolates and also from mycelium and fruiting bodies scraped directly from plum fruit skins. Extracted DNA was amplified using primer pair ITS1-F/Myc1-R (ACTCGTCGAAGGAGCTACG) and PCR products were sequenced using primer pair ITS-1F/ITS4. Six sequences were obtained from pure cultures and seven from colonies on plum fruit skin. BLAST analysis of the 470-bp sequences showed 100% homology to five known species in the SBFS complex: Zygophiala cryptogama, Zygophiala wisconsinensis, Pseudocercosporella sp. RH1, and Stomiopeltis spp. RS1 and RS2 (GenBank Accession Nos. AY598854, AY598853, AY5988645, AY598882, and AY598883, respectively). Observations of colony and fruiting structure morphology from cultures on potato dextrose agar (PDA) and colonies on plums confirmed species identity. A modified version of Koch's postulates was conducted to verify that these fungi caused the signs observed on plum and could also infest apple fruit. In June 2006, 1-month-old cultures on PDA were pulverized in a blender with sterile distilled water, passed through four layers of sterile cheesecloth, and transferred to sterile jars. Each isolate was inoculated onto 20 fruit on plum trees (P. americana) on the Iowa State University (ISU) campus and 20 fruit on cv. Golden Delicious apple trees at the ISU Research Station, Gilbert, IA. Each fruit was disinfested with 70% ethanol, air dried, swabbed with inoculum, and covered with a Fuji bag. At harvest, fungal colonies on fruit were reisolated onto AWA. DNA was extracted from pure cultures; when isolations on agar were unsuccessful, DNA was extracted directly from colonies on fruit. PCR was conducted using ITS1-F/Myc1-R, and PCR products were sequenced using ITS1-F/ITS4. All five species were reisolated and sequenced from apple. Pseudocercosporella sp. RH1 and Stomiopeltis sp. RS1 were sequenced from inoculated plums. Although flyspeck, presumably caused by Schizothyrium pomi, was reported on Japanese plum (P. salicina) in Japan (2) and black cherry (P. serotina) in the United States (3), to our knowledge this is the first report of SBFS fungi on plum in the United States and the first confirmation that fungi from plum can produce SBFS signs on apple fruit. Wild plum may therefore act as a reservoir host, providing inoculum for SBFS infestations on apple. References: (1) J. Batzer et al. Mycologia 97:1268, 2005. (2) H. Nasu and H. Kunoh. Plant Dis. 71:361, 1987. (3) T. B. Sutton. Plant Dis. 72:801, 1988.

Genome-wide scan for adiposity-related phenotypes in adults from American Samoa

OBJECTIVE

To detect quantitative trait loci influencing adiposity-related phenotypes assessed by body mass index (BMI), abdominal circumference (ABDCIR), percent body fat (%BFAT) and fasting serum leptin and adiponectin using a whole genome linkage scan of families from American Samoa.

DESIGN

Family-based linkage analysis, the probands and family members were unselected for obesity.

SUBJECTS

A total of 583 phenotyped American Samoan adults, of which 578 were genotyped in 34 pedigrees.

MEASUREMENTS

A total of 377 autosomal and 18 X chromosome microsatellite markers were typed at an approximate average spacing of 10 cM spanning the genome. Multipoint LOD (logarithm of the odds) scores were calculated using variance-components approaches and SOLAR/LOKI software. The covariates simultaneously evaluated were age, sex, education, farm work and cigarette smoking, with a significance level of 0.1. Due to the stochastic nature of LOKI, we report the average of maximum LOD scores from 10 runs.

RESULTS

Significant linkage to leptin was found at 6q32.2 with LOD of 3.83. Suggestive linkage to leptin was found at 16q21:LOD=2.98, 1q42.2:LOD=1.97, 5q11.2:LOD=2.08, 12q24.23:LOD=2.00, 19p13.3:LOD=2.05; adiponectin was linked to 13q33.1-q22.1:LOD=2.41; %BFAT was linked to 16q12.2-q21, LOD=2.24; ABDCIR was linked to 16q23.1:LOD=1.95; %BFAT-adjusted leptin to 14q12, LOD=2.01; %BFAT-adjusted ABDCIR to 1q31.1, LOD=2.36, to 3q27.3-q28, LOD=2.10 and to 12p12.3, LOD=2.04.

CONCLUSION

We found strong evidence for a major locus on 6q23.2 influencing serum leptin levels in American Samoans. The 16q21 region appears to harbor a susceptibility locus that has significant pleiotrophic effects on phenotypes BMI, %BFAT, leptin and ABDCIR as shown by bivariate linkage analyses. Several other loci of varying significance were detected across the genome.

Density-driven segregation in vertically vibrated binary granular mixtures

Segregation in vertically vibrated binary granular mixtures with the same size is studied experimentally. The partially segregated state occurring in this system is observed carefully. We find that the characteristic of the partially segregated state is that the lighter particles tend to rise and form a pure layer on the top of the system while the heavier particles and some of the lighter ones stay at the bottom and form a mixed layer. The ratio of the thickness of the pure top layer to that of the whole system can be taken as an order parameter, which describes the degree of the segregation quantitatively and is useful in the investigation of the system. By use of it, we find that the segregation state is only dependent on the density ratio of the two kinds of particles. The dependent of the segregation on the vibration frequency is also studied by use of this order parameter, and finally, two typical phase diagrams are given.

Monomethylarsonous acid induced cytotoxicity and endothelial nitric oxide synthase phosphorylation in endothelial cells

Chronic arsenic poisoning is reported to be associated with peripheral and cardiovascular disease, arteriosclerosis, Raynaud's syndrome, hypertension, and Blackfoot disease. Monomethylarsonous acid (MMA(III)) is a reactive metabolite of inorganic arsenic and a potent inhibitor of endothelial nitric oxide synthase (eNOS). Arsenic is also reported to phosphorylate eNOS in cultured keratinocyte and Human T cell leukemia Jurkat cells, respectively. In the present study, we examined the cytotoxicity and eNOS phosphorylation by MMA(III) exposure in cultured bovine aortic endothelial cells (BAEC). Results showed that MMA(III) is more toxic than arsenite in BAEC cells. The IC(50) values for MMA(III) and arsenite were determined to be approximately 1.7 and 24.1 micromol/L, respectively. Exposure of BAEC to MMA(III) (0.75 micromol/L) caused a significant eNOS phosphorylation 15 min after MMA(III) exposure. However, a complex of MMA(III) with dithiothreitol (DTT) that lacks the reactivity with vicinal thiols unaffected eNOS phosphorylation. The present study shows that MMA(III )generated during biomethylation of arsenic is highly toxic in BAEC. Our study also suggests that MMA(III) could induce the eNOS phosphorylation through modification to cellular thiols of the eNOS enzyme. And the initial up-regulation of eNOS phosphorylation by MMA(III )seems to be an adaptive response against disruption of eNOS bioactivity during arsenic exposure.

Induction of cytochrome P450 enzymes in rat liver by two conazoles, myclobutanil and triadimefon

This study was undertaken to examine the inductive effects of two triazole antifungal agents, myclobutanil and triadimefon, on the expression of hepatic cytochrome P450 (CYP) genes and on the activities of CYP enzymes in male Sprague Dawley rats. Rats were dosed with the conazoles at three dose levels by gavage for 14 days: myclobutanil (150, 75, and 10mgkg(-1) body weight day(-1); triadimefon (115, 50, and 10 mg kg(-1) body weight day-'), which included their maximum tolerated dose levels (MTD). Both myclobutanil and triadimefon significantly induced pentoxyresorufin O-depentylase activities at their MTD levels: myclobutanil, 8.1-fold at 150mgkg(-1) body weight day- ; and triadimefon, 18.5-fold at 115mgkg(-1) body weight day-'. Benzyloxyresorufin O-debenzylase activities were similarly increased: myclobutanil, 13.3-fold; triadimefon, 27.7-fold. Quantitative real-time reverse-transcription polymerase chain reaction assays were used to characterize the mRNA expression of specific CYP genes induced by these two conazoles. Myclobutanil and triadimefon treatment at their MTD levels significantly increased rat hepatic mRNA expression of CYP2B1 (14.3- and 54.6-fold), CYP3A23/3A1 (2.2- and 7.3-fold), and CYP3A2 (1.5- and 1.7-fold). Western immunoblots of rat hepatic microsomal proteins identified significantly increased levels of CYP isoforms after myclobutanil or triadimefon treatment at their MTD levels: CYP2BI/2 (4.8- and 5.3-fold), and CYP3A1 (2.2- and 2.9-fold). Triadimefon also increased CYP3A2 immunoreactive protein levels 1.8-fold. These results indicate that triadimefon and myclobutanil, like other triazole-containing conazoles, induced CYP2B and CYP3A families of cytochromes in rat liver.

Juvenile ossifying fibroma of the maxilla

Juvenile ossifying fibroma is a rare fibro-osseous neoplasm in young children. This lesion is locally aggressive and spreads quickly, and because it has a very high recurrence rate complete excision is essential. Reported here is a case of a massive juvenile ossifying fibroma of the maxilla in an 11-year-old male child. A titanium mesh was used to reconstruct the facial contour after a left total maxillectomy, achieving a satisfactory facial appearance.

Interactive effects of ozone and climate on tree growth and water use in a southern Appalachian forest in the USA

* A lack of data on responses of mature tree growth and water use to ambient ozone (O(3)) concentrations has been a major limitation in efforts to understand and model responses of forests to current and future changes in climate. * Here, hourly to seasonal patterns of stem growth and sap flow velocity were examined in mature trees from a mixed deciduous forest in eastern Tennessee (USA) to evaluate the effects of variations in ambient O(3) exposure and climate on patterns of stem growth and water use. * Ambient O(3) caused a periodic slowdown in seasonal growth patterns that was attributable in part to amplification of diurnal patterns of water loss in tree stems. This response was mediated by statistically significant increases in O(3)-induced daily sap flow and led to seasonal losses in stem growth of 30-50% for most species in a high-O(3) year. * Decreased growth and increased water use of mature forest trees under episodically high ambient O(3) concentrations suggest that O(3) will amplify the adverse effects of increasing temperatures on forest growth and forest hydrology.

A mass balance study on nitrification and deammonification in vertical flow constructed wetlands treating landfill leachate

A laboratory-scale, mass-balance study was carried out on the transformation of nitrogenous pollutants in four vertical flow wetland columns. Landfill leachate containing low organic matter, but a high concentration of ammoniacal-nitrogen, was treated under dissolved oxygen concentrations close to saturation. Influent total nitrogen (TN) comprised ammoniacal-nitrogen with less than 1% nitrate and nitrite, negligible organic nitrogen, and very low BOD. Nitrification occurred in three of the four columns. There was a substantial loss of total nitrogen (52%) in one column, whereas other columns exhibited zero to minor losses (< 12%). Nitrogen loss under study conditions was unexpected. Two hypotheses are proposed to account for it: (1) either the loss of TN is attributed to nitrogen transformation into a form (provisionally termed alpha-nitrogen) that is undetectable by the analytical methods used; or (2) the loss is caused by microbial denitrification or deammonification. By elimination and stoichiometric mass balance calculations, completely autotrophic nitrogen-removal over nitrite (CANON) deammonification is confirmed as responsible for nitrogen loss in one column. This result reveals that CANON can be native to aerobic engineered wetland systems treating high ammonia, low organic content wastewater.

Interactive effects of ozone and climate on water use, soil moisture content and streamflow in a southern Appalachian forest in the USA

* Documentation of the degree and direction of effects of ozone on transpiration of canopies of mature forest trees is critically needed to model ozone effects on forest water use and growth in a warmer future climate. * Patterns of sap flow in stems and soil moisture in the rooting zones of mature trees, coupled with late-season streamflow in three forested watersheds in east Tennessee, USA, were analyzed to determine relative influences of ozone and other climatic variables on canopy physiology and streamflow patterns. * Statistically significant increases in whole-tree canopy conductance, depletion of soil moisture in the rooting zone, and reduced late-season streamflow in forested watersheds were detected in response to increasing ambient ozone levels. * Short-term changes in canopy water use and empirically modeled streamflow patterns over a 23-yr observation period suggest that current ambient ozone exposures may exacerbate the frequency and level of negative effects of drought on forest growth and stream health.

Thymidine-phosphorothioate oligonucleotides induce activation and apoptosis of CLL cells independently of CpG motifs or BCL-2 gene interference

We compared antisense phosphorothioate oligonucleotides (PS-ODN) that target BCL-2 such as Genasense (G3139-PS), with other PS-ODN or phosphodiester-ODN (PO-ODN) in their relative capacity to induce apoptosis of chronic lymphocytic leukemia (CLL) B cells in vitro. Surprisingly, we found that thymidine-containing PS-ODN, but not PO-ODN, induced activation and apoptosis of CLL cells independent of BCL-2 antisense sequence or CpG motifs. All tested thimidine-containing PS-ODN, irrespective of their primary sequences, reduced the expression of Bcl-2 protein and increased the levels of the proapoptotic molecules p53, Bid, Bax in CLL cells. Apoptosis induced by thymidine-containing PS-ODN was preceded by cellular activation, could be blocked by the tyrosine-kinase inhibitor imatinib mesylate (Gleevec), and was dependent on ABL kinase. We conclude that thymidine-containing PS-ODN can activate CLL cells and induce apoptosis via a mechanism that is independent of BCL-2 gene interference or CpG motifs.

Performance of tPSA and f/tPSA for prostate cancer in Chinese. A systematic review and meta-analysis

Performing a systematic review and meta-analysis to evaluate the diagnostic performance of the total prostate-specific antigen (tPSA) tests for diagnosis of prostate cancer among Chinese. Literatures related to diagnosis of prostate cancer by tPSA and the ratio of free to total PSA (f/tPSA) being retrieved in five electronic databases. Sensitivity, specificity, positive likelihood ratio, negative likelihood ratio and diagnostic odds ratio (DOR) were pooled using random effects models. Summary receiver operating characteristic curves (SROC) used to summarize overall test performance. In total 10 studies meeting the inclusion criteria, 2256 patients were included. Among them 423 were patients of prostate cancer compared to 1833 were patients of benign prostate hyperplasia (BPH). The pooled sensitivity and specificity of tPSA>4.0 ng/ml, tPSA>10.0 ng/ml and f/tPSA<0.15 as threshold for the diagnosis of prostate cancer were heterogeneity. The areas under SROC (AUC) were 80, 85 and 87%, respectively (P<0.05). The pooled DOR were 8.44(95%CI: 4.45 approximately 16.00), 9.94(95%CI: 4.15 approximately 23.77) and 13.75(95%CI: 6.35 approximately 29.76), respectively (P<0.05). chi(2) test used for testing the heterogeneity. tPSA and f/tPSA made an important performance for diagnosis of prostate cancer in decade among Chinese. The use of f/tPSA<0.15 as threshold maintain a high prognostic accuracy for prostate cancer.

Promoter methylation and protein expression of the Slit2 and Robo1 genes in resected esophageal squamous cell carcinoma

10032

Background: Recent epigenetic studies suggest that the slit-robo pathway is involved in tumorigenesis of a number of human cancers and a role of SLIT2 as a tumor suppressor gene. In view of lack of epigenetic studies of SLIT2 and ROBO1 genes in squamous cell esophageal carcinoma (ESCC), we investigate whether promoter methylation is responsible for aberrant protien expression of SLIT2 and ROBO1 and whether promoter methylation and aberrant protein expression of these two genes are related to prognosis after resection for ESCC. Methods: We analyzed promoter methylation of SLIT2 and ROBO1 using methylation-specific polymerase chain reaction (MSP) and their protein expression using immunohistochemistry in 60 resected tumor specimens. The Pearson χ2 test was used to compare promoter methylation and protein expression of SLIT2 and ROBO1 among patients with different clinicopathological parameters. Concordance analysis was performed between promoter methylation and protein expression of these two genes. Results: Promoter methylation of SLIT2 and ROBO1 was observed in 43 (71.6%) and 16 (26.6%) of the 60 resected specimens, respectively (P = 0.002). Aberrant protein expression of SLIT2 and ROBO1 was observed in 51 (85%) and 23 (38.3%), respectively (P < 0.001). Promoter methylation of SLIT2 correlated well with smoking (P = 0.046), betel nut chewing (P = 0.032), staging (P = 0.018) and tumor (T) factor (P < 0.001) of the TNM system and its aberrant protein expression correlated well with betel nut chewing (P = 0.038), staging (P = 0.025) and nodal (N) involvement (P = 0.004). Promoter methylation and protein expression of ROBO1 did not correlate with any of these clinicopathologic parameters. A concordance rate of 88.2% and 74.2% was present between expression of SLIT2 and ROBO1 protein and their promoter methylation (P < 0.001) and (P = 0.004), respectively. Conclusions: Aberrant expression of SLIT2 and ROBO1 protein is frequently associated with the presence of ESCC, with SLIT2 a more predominant one. Promoter methylation is one of the major mechanisms responsible for aberrant protein expression of these two genes in resected ESCC. Promoter methylation and aberrant protein expression of SLIT2 may predict prognosis after resection for ESCC.

No significant financial relationships to disclose.

The mechanisms of apoptosis induced by artistical composition of Chinese medicinal herbs in gastric cancer metastasis

14147

Background: In China, gastric cancer has been treated by Chinese medicinal herbs to prevent relapse and metastasis for decades. The purpose of this study is to investigate the effectiveness and the mechanism of artistical composition of Chinese medicinal herbs (YWKL) in preventing gastric cancer metastasis. Methods: The herbs, after decoction, were administered by feeding 615 mice, which is a proventriculus cancer (FC) transplanted model, the rate of its lung metastasis rate is 70–80%. The inhibitory effect of artistical composition of Chinese medicinal herbs on FC spontaneous lung metastasis was evaluated by histological classification method. Apoptosis were determined through TUNEL technique. The expression of apoptosis relative gene was determined by immunohistochemical methods. Results: It has been found that YWKL can significantly decrease the tumorous node numbers in the lung, while increase the apoptosis cell index (AI) of tumor cell metastasizing to lung. We found the expression of Fas,Bax were much higher than that of control group, FasL and Bcl2 were no significantly different between the two groups. Conclusions: The oral application of the herbs after decoction was demonstrated to prevent gastric cancer metastasis mice model. The mechanism of YWKL-induced apoptosis in FC cancer cell might through regulating the expression of Fas and Bax genes.

No significant financial relationships to disclose.

Central and/or peripheral immunoreactivity of orexin-A in pregnant rats and women

Orexins (A and B) have been implicated in feeding behavior, energy balance and state of vigilance. During pregnancy, their involvement in feeding regulation and reproduction are poorly understood. In this study, we investigated orexin-A immunoreactivity in the hypothalamus and serum in pregnant rats and women by immunofluorescence staining, image analysis and radioimmunoassay, examined the correlation of serum orexin-A and leptin with gestational age in pregnant women by regression analysis, and explored the effect of leptin injected intracerebroventricularly (i.c.v.) on orexin-A immunoreactivity in the hypothalamus of normal rats by immunohistochemistry. The results showed that pregnant rats had significantly greater daily food intake on days 15 and 20 of pregnancy than virgin ones (+27.3%, P< 0.01 and +38.6%, P< 0.001 respectively), with significantly fewer number and lower mean staining intensity of orexin-A-immunoreactive (ir) neurons on days 16 (both P< 0.05) and 21 (both P< 0.01) of pregnancy. Moreover, serum levels of orexin-A exhibited 2.0-fold and 2.2-fold increases (both P< 0.001) in rats on days 16 and 21 of pregnancy compared with those in virgin rats, and 1.9-fold and 2.0-fold increases (both P< 0.001) in mid (13-26 weeks) and late pregnant women (27-40 weeks) compared with those in non-pregnant women. Simultaneously, serum levels of leptin showed a 2.3-fold and 2.2-fold increase (both P< 0.001) in rats on days 16 and 21 of pregnancy, and a 3.3-fold and 4.3-fold increase (both P< 0.001) in mid and late pregnant women. Serum levels of both orexin-A and leptin correlated positively with gestational age in pregnant women. Leptin injected i.c.v. significantly decreased the number (P< 0.01) and mean staining intensity (P< 0.01) of orexin-A-ir neurons in the hypothalamus, food intake (P< 0.01) and body weight gain (P< 0.001) compared with vehicle injection in normal rats. These results suggested that central and serum orexin-A might be involved in the regulation of feeding and energy metabolism during pregnancy. The change in central orexin-A immunoreactivity might be related to the increased serum leptin concentrations.

Comparison of immunomodulator mRNA and protein expression in the lungs of Stachybotrys chartarum spore-exposed mice

Stachybotrys chartarum is an important toxigenic fungus that has been associated with respiratory disease onset in animals and humans. It can be separated into macrocyclic trichothecene-producing and nonproducing chemotypes based on secondary metabolite production. However, effects of spores of the two chemotypes on lung inflammatory responses are poorly understood. In this study, real-time reverse-transcription polymerase chain reaction (RT-PCR) and enzyme linked immunosorbent assay (ELISA) were used to investigate time-course (1, 3, 6, 24, and 48 h post-instillation [PI]) relationships in mice intratracheally exposed to 300 spores/g body weight of a macrocyclic trichothecene-producing (JS 58-17) and a nonproducing (JS 58-06) S. chartarum isolate and of Cladosporium cladosporioides. There were marked differences in the magnitude and temporal patterns of mouse lung immune responses to intratracheal exposure to spores of these species at this spore dose. Both macrophage inflammatory protein 2 (MIP-2) and surfactant protein-D (SP-D) mRNA expression were significantly upregulated in lungs of JS 58-17-treated animals compared to that of all other treatment animals at 6 and 24 h PI. Heightened mRNA expression of these immunomodulators combined with comparatively depressed MIP-2 and tumor necrosis factor (TNF)-a protein expression suggests that the action of macrocyclic trichothecenes sequestered in 58-17 spores is involved. Interestingly, TNF-a protein expression in all spore treatment animal groups was also significantly increased over that in saline controls. Similarities in expression among all spore treatment animals suggest that chemicals other than toxic secondary metabolites, and possibly spore-sequestered 1,3-beta-D-glucan, may contribute to lung pathogenesis.

TGFBR1*6A is not associated with prostate cancer in men of European ancestry

The TGFBR1*6A (*6A) variant in exon 1 of the TGFBR1 gene has been postulated as a putative tumor susceptibility allele in several studies. We have performed a case-control study in 537 men with histologically verified prostate cancer and in 488 unrelated controls to investigate the association of *6A with prostate cancer. Our results revealed that the frequency of the (*)6A allele does not differ in men with prostate cancer compared to healthy controls, even in a subset of age-matched cases and controls. There is no compelling evidence for an association of the *6A variant with prostate cancer.

Method for isolating tight-binding inhibitors of rat lens aldose reductase

Numerous animal studies indicate that aldose reductase inhibitors (ARIs) are beneficial for the prevention or amelioration of diabetic complications such as neuropathy, nephropathy and the ocular complications of cataract, retinopathy and keratopathy. To aid in the identification of novel potent ARIs, we have previously developed a screening method that is based on the formation of a non-covalent ternary tight-binding enzyme-inhibitor-nucleotide (AR-ARI-NADPH) complex that can be isolated using YM-10 filter units. Here, we report a modification of this method that permits us to rapidly identify tight binding ARIs that are isolated by denaturation from AR-ARI-NADPH complexes that are free of possible contamination resulting from the reaction of methanol with the YM-10 filter units. For the development of this procedure, nine structurally diverse ARIs were mixed with purified recombinant rat lens aldose reductase (RLAR) bound with NADPH to form tight-binding RLAR-ARI-NADPH complexes. These complexes were purified by high pressure Sephadex 75 size exclusion chromatography using ammonium acetate buffer and the formation of each complex was confirmed by electrospray ionisation mass spectrometry (ESI-MS). Each of the complexes was then denatured with methanol, rechromatographed on the size exclusion column, and the identity of the bound ARIs was confirmed by ESI-MS. The apparent ARI binding with aldose reductase to form a tight binding ARI complex appeared proportional to their IC50 values. This procedure allows for the rapid identification of tight binding ARIs with apparent IC50s<0.1 microm.

The early gene Broad is involved in the ecdysteroid hierarchy governing vitellogenesis of the mosquito Aedes aegypti

The broad (br) gene, encoding a family of C2H2 type zinc-finger DNA-binding proteins, has been shown to act as a crucial member of the 20-hydroxyecdysone (20E) regulatory hierarchy in the fruitfly, Drosophila melanogaster and the moth, Manduca sexta. In this study, we have shown that the br gene is involved in the 20E-regulatory hierarchy controlling vitellogenesis in the mosquito, Aedes aegypti. Unlike E74 and E75 early genes, expression of br was activated in previtellogenic females, during a juvenile hormone (JH)-dependent period. The levels of Z1, Z2 and Z4 isoform mRNA were elevated in the fat body of 2-day-old females after in vitro exposure to JH III. However, JH III repressed 20E activation of br in 3-to 5-day-old females, indicating a switch in hormonal commitment. Expression of Z1, Z2 and Z4 was stimulated after blood feeding in both vitellogenic tissues, the fat body and the ovary, corresponding to peaks of ecdysteroid titers. In the fat body, the mRNA profiles of these three isoforms correlated well with those of yolk protein precursor (YPP) genes. These BR isoforms were activated by 20E in fat bodies cultured in vitro and behaved as early genes, with a self-repressive autoregulatory loop that can be blocked by the protein inhibitor, cyclohexamide. Multiple binding sites for all four BR isoforms were present in the 5'-regulatory region of the major YPP gene, vitellogenin (Vg). Effects of BR isoforms on the expression of Vg have been demonstrated by cell transfection analysis. In particular, BR isoforms by themselves had no effects on the Vg promoter. However, Z1 and Z4 each repressed Aedes aegypti ecdysone receptor (EcR)/Ultraspiracle (USP)-mediated 20E activation of the Vg promoter, while Z2 enhanced activation of the Vg promoter by AaEcR/AaUSP in the presence of 20E. Z3 had no obvious effect in the same experiment. These results suggested that BR isoforms are essential for proper activation and termination of the Vg gene in response to 20E. Overall, our study implicated br in the regulation of mosquito vitellogenesis.

Purification capacity of a highly loaded laboratory scale tidal flow reed bed system with effluent recirculation

The purification capacity of a laboratory scale tidal flow reed bed system with final effluent recirculation at a ratio of 1:1 was investigated in this study. In particular, the four-stage reed bed system was heavily loaded with strong agricultural wastewater. Under the hydraulic and organic loading rates of 0.43 m3/m2.d and 1055 gCOD/m2.d, respectively, the average removal efficiencies obtained for COD, BOD5, SS, NH4-N and P were 77%, 78%, 66%, 62% and 38%, respectively. Even with the high loading rates, approximately 30% of NH4-N was converted into NO2-N and NO3-N from the mid-stage of the system where nitrification took place. The results suggest that the multi-stage reed bed system could be employed to treat strong wastewater under high loading, especially for the substantive mass removal of solids, organic matter and ammoniacal-nitrogen. Tidal flow combined with effluent recirculation is a favourable operation strategy to achieve this objective.