First measurements of spin-dependent double-differential cross sections and the Gerasimov-Drell-Hearn Integrand from 3He(γ,n)pp at incident photon energies of 12.8 and 14.7 MeV

The first measurement of the three-body photodisintegration of longitudinally polarized (3)He with a circularly polarized γ-ray beam was carried out at the High Intensity γ-ray Source facility located at Triangle Universities Nuclear Laboratory. The spin-dependent double-differential cross sections and the contributions from the three-body photodisintegration to the (3)He Gerasimov-Drell-Hearn integrand are presented and compared with state-of-the-art three-body calculations at the incident photon energies of 12.8 and 14.7 MeV. The data reveal the importance of including the Coulomb interaction between protons in three-body calculations.

Lipopolysaccharide enhances mouse lung tumorigenesis: a model for inflammation-driven lung cancer

The association between pulmonary inflammation and lung cancer is well established. However, currently there are no appropriate models that recapitulate inflammation-related lung cancer in humans. In the present study, we examined, in 2 tumor bioassays, enhancement by bacterial lipopolysaccharide (LPS) of 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK)-induced lung tumorigenesis in A/J mice. Mice that were treated with NNK alone developed 29.6 ± 9.8 and 36.2 ± 4.1 lung tumors per mouse in experiments 1 and 2, respectively. Chronic intranasal instillation of LPS to NNK-treated mice increased the multiplicity of lung tumors to 47.3 ± 16.1 and 51.2 ± 4.8 lung tumors per mouse in experiments 1 and 2, corresponding to a significant increase by 60% and 41%, respectively. Moreover, administration of LPS to NNK-pretreated mice significantly increased the multiplicity of larger tumors and histopathologically more advanced lesions (adenoma with dysplasia and adenocarcinoma), macrophage recruitment to the peritumoral area, and expression of inflammation-, cell proliferation-, and survival-related proteins. Overall, our findings demonstrated the promise of the NNK-LPS-A/J mice model to better understand inflammation-driven lung cancer, dissect the molecular pathways involved, and identify more effective preventive and therapeutic agents against lung cancer.

Lactogenic hormones stimulate expression of lipogenic genes but not glucose transporters in bovine mammary gland

During the onset of lactation, there is a dramatic increase in the expression of glucose transporters (GLUT) and a group of enzymes involved in milk fat synthesis in the bovine mammary gland. The objective of this study was to investigate whether the lactogenic hormones mediate both of these increases. Bovine mammary explants were cultured for 48, 72, or 96 h with the following hormone treatments: no hormone (control), IGF-I, insulin (Ins), Ins + hydrocortisone + ovine prolactin (InsHPrl), or Ins + hydrocortisone + prolactin + 17β-estradiol (InsHPrlE). The relative expression of β-casein, α-lactalbumin, sterol regulatory element binding factor 1 (SREBF1), fatty acid synthase (FASN), acetyl-CoA carboxylase α (ACACA), stearyol-CoA desaturase (SCD), GLUT1, GLUT8, and GLUT12 were measured by real-time PCR. Exposure to the lactogenic hormone combinations InsHPrl and InsHPrlE for 96 h stimulated expression of β-casein and α-lactalbumin mRNA by several hundred-fold and also increased the expression of SREBF1, FASN, ACACA, and SCD genes in mammary explants (P < 0.01). However, those hormone combinations had no effect on GLUT1 or GLUT8 expression and inhibited GLUT12 expression by 50% after 72 h of treatment (P < 0.05). In separate experiments, the expression of GLUTs in the mouse mammary epithelial cell line HC11 or in bovine primary mammary epithelial cells was not increased by lactogenic hormone treatments. Moreover, treatment of dairy cows with bovine prolactin had no effect on GLUT expression in the mammary gland. In conclusion, lactogenic hormones clearly stimulate expression of milk protein and lipogenic genes, but they do not appear to mediate the marked up-regulation of GLUT expression in the mammary gland during the onset of lactation.

Serum uric acid is associated with dietary and lifestyle factors in elderly women in suburban Guangzhou in Guangdong province of south China

OBJECTIVES

To estimate the prevalence of hyperuricemia and lifestyle risk factors for hyperuricemia in elderly women.

DESIGN

Cross-sectional study.

SETTING

The suburban area of Guangzhou, Guangdong province, China.

PARTICIPANTS

The study included 856 Chinese women aged 60 to 102 years who received their annual health examinations in the suburban area of Guangzhou, south China in 2002.

MEASUREMENTS

Information on anthropometric measurements and lifestyle factors were obtained via a questionnaire processed by the attending physicians or nurses. Blood biochemistry was performed after subjects fasted for 8-14 h. Unconditional logistic regression analysis was used to investigate associations between hyperuricemia, meat intake quintiles, physical activity quintiles, and alcohol intake quintiles.

RESULTS

The prevalence of hyperuricemia in the studied population was 12.01%. Alcohol, meat and seafood consumption; being overweight or obese; hypertension; and abnormal triglyceride levels were strongly associated with a higher prevalence of hyperuricemia. Physical activity was inversely related to the prevalence of hyperuricemia. The odds ratios for hyperuricemia for quintiles of physical activity were 1.00, 0.74, 0.72, 0.63, and 0.55 (P<0.01).

CONCLUSIONS

Our data suggest that the prevalence of hyperuricemia is high in elderly women in suburban Guangzhou in Guangdong province of South China. Obesity, meat and seafood intake and alcohol consumption are associated with a higher prevalence of hyperuricemia, whereas daily physical activity is inversely related to the prevalence of hyperuricemia.

Observation of electron-antineutrino disappearance at Daya Bay

The Daya Bay Reactor Neutrino Experiment has measured a nonzero value for the neutrino mixing angle θ(13) with a significance of 5.2 standard deviations. Antineutrinos from six 2.9 GWth reactors were detected in six antineutrino detectors deployed in two near (flux-weighted baseline 470 m and 576 m) and one far (1648 m) underground experimental halls. With a 43,000 ton-GWth-day live-time exposure in 55 days, 10,416 (80,376) electron-antineutrino candidates were detected at the far hall (near halls). The ratio of the observed to expected number of antineutrinos at the far hall is R=0.940±0.011(stat.)±0.004(syst.). A rate-only analysis finds sin(2)2θ(13)=0.092±0.016(stat.)±0.005(syst.) in a three-neutrino framework.

New precision limit on the strange vector form factors of the proton

The parity-violating cross-section asymmetry in the elastic scattering of polarized electrons from unpolarized protons has been measured at a four-momentum transfer squared Q2 = 0.624  GeV2 and beam energy E(b) = 3.48  GeV to be A(PV) = -23.80 ± 0.78(stat) ± 0.36(syst) parts per million. This result is consistent with zero contribution of strange quarks to the combination of electric and magnetic form factors G(E)(s) + 0.517G(M)(s) = 0.003 ± 0.010(stat) ± 0.004(syst) ± 0.009(ff), where the third error is due to the limits of precision on the electromagnetic form factors and radiative corrections. With this measurement, the world data on strange contributions to nucleon form factors are seen to be consistent with zero and not more than a few percent of the proton form factors.

New measurements of high-momentum nucleons and short-range structures in nuclei

We present new measurements of electron scattering from high-momentum nucleons in nuclei. These data allow an improved determination of the strength of two-nucleon correlations for several nuclei, including light nuclei where clustering effects can, for the first time, be examined. The data also include the kinematic region where three-nucleon correlations are expected to dominate.

Beam-target double-spin asymmetry A{LT} in charged pion production from deep inelastic scattering on a transversely polarized {3}He target at 1.4<Q{2}<2.7 GeV{2}

We report the first measurement of the double-spin asymmetry A{LT} for charged pion electroproduction in semi-inclusive deep-inelastic electron scattering on a transversely polarized {3}He target. The kinematics focused on the valence quark region, 0.16<x<0.35 with 1.4<Q{2}<2.7  GeV{2}. The corresponding neutron A{LT} asymmetries were extracted from the measured {3}He asymmetries and proton over {3}He cross section ratios using the effective polarization approximation. These new data probe the transverse momentum dependent parton distribution function g{1T}{q} and therefore provide access to quark spin-orbit correlations. Our results indicate a positive azimuthal asymmetry for π{-} production on {3}He and the neutron, while our π{+} asymmetries are consistent with zero.

Immunoregulation effect by overexpression of heme oxygenase-1 on cardiac xenotransplantation

OBJECTIVE

This study was designed to investigate the effect of the overexpression of heme oxygenase-1 (HO-1) on the immunoregulation in the model of abdominal cardiac xenotransplantation from the guinea pig to the rat.

MATERIALS AND METHODS

To increase the expression of HO-1, both donors and recipients were injected with heme through the abdomen before the operation. The donors (guniea pigs) and the recipients (Sprague-Dawley [SD] rats) were divided randomly into three groups: group A, the heart from a guinea pig transplanted into the abdomen of an SD rat; group B, the recipients were injected with Chinese cobra venom factor (CVF) into the abdomen (40 μg/kg and 60 μg/kg 24 hours later) prior to transplantation; group C, CVF + HO-1 high-expression group: donors and recipients were abdominally injected with heme (75 μmol/kg for 2 days before transplantation). The mean survival time (MST), pathological changes, the positive area of HO-1 in the grafted hearts, as well as the expressions of C-C chemokine receptor 5 (CCR5), intercellular adhesion molecule-1 (ICAM-1), and natural killer (NK) cell activity in recipients.

RESULTS

1. The MST was longest in group C treated with heme. 2. The pathologic changes of hyperacute rejection were showed on the donor heart in group A, while delayed xenograft rejection changes took place on donor heart in other groups. 3. Compared with group B, The HO-1 positive area in the donor hearts of group C was significantly higher. (P < .05). 4. The lever of ICAM-1 and CCR5 in the peripheral blood of recipients (pg/mL) was attenuated in group C injected with heme. 5. Compared with group B, the activity of NK cell in the peripheral blood of recipients was much lower in group C (P < .05).

CONCLUSION

The MST was prolonged by increasing expressions of HO-1, but acute vascular rejection was not completely overcome. Activation of vascular endothelial cells could be decreased by strengthening the expression of HO-1. NK cell activity was weakened by reinforced expression of HO-1.

Design and feasibility studies of a stationary digital breast tomosynthesis system

Studies have shown that digital breast tomosynthesis (DBT) can improve breast cancer diagnosis by reconstructing 3D images. However, DBT scanners based on rotation gantry prolong the imaging time and reduce spatial resolution due to motion comparing with the regular two-view mammography. To obtain three dimension reconstruction images and maintain the high image quality of conventional mammography, we proposed a prototype stationary digital breast tomosynthesis system (s-DBT). The proposed s-DBT system acquires projection images without mechanical movement. The core component of the s-DBT system is a specially designed spatially distributed multi-beam x-ray tube based on the carbon nanotube field emission x-ray technology. The multi-beam x-ray source array enables collection of all projection images from different viewing angles without mechanical motion. Preliminary results show the s-DBT system can achieve a scan time comparable to the regular two-view mammography, and improve the spatial resolution comparing with rotating gantry DBT.

Single spin asymmetries in charged pion production from semi-inclusive deep inelastic scattering on a transversely polarized 3He Target at Q2 = 1.4-2.7 GeV2

We report the first measurement of target single spin asymmetries in the semi-inclusive (3)He(e,e'π(±))X reaction on a transversely polarized target. The experiment, conducted at Jefferson Lab using a 5.9 GeV electron beam, covers a range of 0.16 < x < 0.35 with 1.4 < Q(2) < 2.7 GeV(2). The Collins and Sivers moments were extracted from the azimuthal angular dependence of the measured asymmetries. The π(±) Collins moments for (3)He are consistent with zero, except for the π(+) moment at x = 0.35, which deviates from zero by 2.3σ. While the π(-) Sivers moments are consistent with zero, the π(+) Sivers moments favor negative values. The neutron results were extracted using the nucleon effective polarization and measured cross section ratios of proton to (3)He, and are largely consistent with the predictions of phenomenological fits and quark model calculations.

PPARα agonist prevented the apoptosis induced by glucose and fatty acid in neonatal cardiomyocytes

OBJECTIVE

We investigated the effect of peroxisome proliferator activator receptors α (PPARα) on cardiomyocyte apoptosis induced by glucose and fatty acid, and if high glucose levels could increase fatty acid-induced apoptosis.

METHODS

Cardiomyocytes were maintained in Dulbecco's Modified Eagle Medium and divided into 5 groups: Group N (control Group); Group G (exposed to 25.5 mmol/l glucose); Group L (exposed to 5 mmol/l glucose, fatty acid); Group H (exposed to 25.5 mmol/l glucose and fatty acid); Group I (exposed to 25.5 mmol/l glucose, fatty acid and Wy14643). Apoptosis was detected by terminal deoxynucleotidyl transferase-mediated dUTP nick end-labeling. Immunocytochemistry staining detected PPARα's expressing, and western blotting detected PPARα and nuclear factor κB's (NF-κB) protein level.

RESULTS

Exposure to fatty acid resulted in a significant increase of cardiomyocytes apoptosis, with the extension of NF-κB formation, whereas exposure to 25.5 mmol/l glucose had no influence on the apoptosis rate. However, combination with fatty acid and high glucose concentration had induced more apoptosis with the up-regulation of NF-κB formation. The fatty acid and glucose-induced effects were improved by Wy14643, with down-regulation of NF-κB formation.

CONCLUSION

These results suggested that in neonatal cardiomyocytes, fatty acid and glucose in combination with fatty acid induced apoptosis via NF-κB formation and activation of apoptosis pathways; glucose in combination with fatty acid induce more apoptosis rate for the more NF- κB formation, activation of the PPARα can reverse such apoptosis effect. The results also suggest that gluco-lipotoxicity may play a central role in the development of diabetic cardiomyopathy, and PPARα-agonist may be an effective drug in treating the diabetic cardiomyopathy.

Stationary digital breast tomosynthesis with distributed field emission X-ray tube

Tomosynthesis requires projection images from different viewing angles. Using a distributed x-ray source this can be achieved without mechanical motion of the source with the potential for faster image acquisition speed. A distributed x-ray tube has been designed and manufactured specifically for breast tomosynthesis. The x-ray tube consists of 31 field emission x-ray sources with an angular range of 30°. The total dose is up to 100mAs with an energy range between 27 and 45 kVp. We discuss the source geometry and results from the characterization of the first prototype. The x-ray tube uses field emission cathodes based on carbon nanotubes (CNT) as electron source. Prior to the manufacturing of the sealed x-ray tube extensive testing on the field emission cathodes has been performed to verify the requirements for commercial tomosynthesis systems in terms of emission current, focal spot size and tube lifetime.

Precise extraction of the induced polarization in the 4He(e,e'p)3H reaction

We measured with unprecedented precision the induced polarization P(y) in (4)He(e,e'p)(3)H at Q(2)=0.8 and 1.3  (GeV/c)(2). The induced polarization is indicative of reaction-mechanism effects beyond the impulse approximation. Our results are in agreement with a relativistic distorted-wave impulse approximation calculation but are overestimated by a calculation with strong charge-exchange effects. Our data are used to constrain the strength of the spin-independent charge-exchange term in the latter calculation.

The role of p27(Kip1) phosphorylation at serine 10 in the migration of malignant glioma cells in vitro

Until recently, Cip/Kip members were almost solely viewed as nuclear proteins with a principal function of inhibiting cyclin/cyclin dependent kinase (CDK) activity and hence, inhibiting cell cycle progression. P27(Kip1) (hereafter p27) belongs to the Cip/Kip family that binds and inhibits all the cyclin/CDK complexes, thus often referred as a universal CDK inhibitor. However, emerging studies now suggest that Cip/Kip proteins play additional roles outside of the nucleus. Indeed, previous reports have linked p27 to the regulation of actin dynamics and cell migration. In this study, we constructed a model of migration-activated glioma cells by using the migration-stimulating substrate, a kind of ECM, laminin in vitro. Our results present evidence that laminin drives glioma cell migration without altering cell proliferation. Further, actively migrating cells which expressioned high phosphorylation of p27 at Ser10, and induced its cytoplasmic localization. In this process, Jab1 and CRM1 were also involved. Thus phosphorylation of p27 at Ser10 is necessary for both cytoplasmic localization and induction of cell migration. These observations solidified a genetic role of p27 in cell migration and this was independent of cyclin/CDK inhibition. Eventually, we transiently transfected p27S10A into T98G glioma cells, found that overexpression of p27S10A inhibited cell migration but not cell proliferation. These data linked phosphorylation of p27 at Ser10 and cell motility. Therefore, the major phosphorylation site at Ser10 of p27 played a pivotal role in the migration of malignant glioma cells.

Measurements of the electric form factor of the neutron up to Q2=3.4 GeV2 using the reaction 3He(e,e'n)pp

The electric form factor of the neutron was determined from studies of the reaction 3He(e,e'n)pp in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2 range over which it is known, we find G(E)(n)=0.0236±0.0017(stat)±0.0026(syst), 0.0208±0.0024±0.0019, and 0.0147±0.0020±0.0014 for Q(2)=1.72, 2.48, and 3.41 GeV2, respectively.

Scaling of the F2 structure function in nuclei and quark distributions at x>1

We present new data on electron scattering from a range of nuclei taken in Hall C at Jefferson Lab. For heavy nuclei, we observe a rapid falloff in the cross section for x>1, which is sensitive to short-range contributions to the nuclear wave function, and in deep inelastic scattering corresponds to probing extremely high momentum quarks. This result agrees with higher energy muon scattering measurements, but is in sharp contrast to neutrino scattering measurements which suggested a dramatic enhancement in the distribution of the "superfast" quarks probed at x>1. The falloff at x>1 is noticeably stronger in 2H and 3He, but nearly identical for all heavier nuclei.

Polarization transfer in the 4He(e,e'p)3H reaction at Q2=0.8 and 1.3 (GeV/c)2

Proton recoil polarization was measured in the quasielastic 4He(e,e'p)3H reaction at Q{2}=0.8 and 1.3  (GeV/c){2} with unprecedented precision. The polarization-transfer coefficients are found to differ from those of the 1H(e,e'p) reaction, contradicting a relativistic distorted-wave approximation and favoring either the inclusion of medium-modified proton form factors predicted by the quark-meson coupling model or a spin-dependent charge-exchange final-state interaction. For the first time, the polarization-transfer ratio is studied as a function of the virtuality of the proton.

E-cadherin negatively regulates neoplastic growth in non-small cell lung cancer: role of Rho GTPases

Non-small cell lung cancers (NSCLC) that express the cell surface adhesion protein E-cadherin may carry a better prognosis than E-cadherin-negative tumors. Here, we found substantial inhibition of anchorage-independent growth in soft agar and cell migration in each of four NSCLC lines stably transfected with E-cadherin. The inhibitory effects were independent of the EGFR and beta-catenin/Wnt-signaling pathways. However, E-cadherin expression was associated with an adhesion-dependent reduction in the activity of Rho family proteins, RhoA in two lines and Cdc42 in the other two. The reduction of RhoA activity was dependent on DLC-1 Rho-GAP and p190 Rho-GAP and associated with an increase in a membrane-associated p190 Rho-GAP/p120 Ras-GAP complex. In parental cells with high levels of RhoA-GTP, siRNA-mediated knock-down of RhoA reduced cell migration and agar growth in a manner analogous to E-cadherin. In parental cells with high levels of Cdc42-GTP, transfection of a Cdc42 dominant-negative mutant reduced cell growth and migration similarly to cells expressing E-cadherin. Thus, E-cadherin can negatively regulate cell proliferation and migration in NSCLC by reducing the level of the predominant active form of Rho family protein, RhoA or Cdc42. These proteins can be considered downstream effectors of E-cadherin and might represent therapeutic targets in some NSCLC.

SERIAL NONRIGID VASCULAR REGISTRATION USING WEIGHTED NORMALIZED MUTUAL INFORMATION

Vascular registration is a challenging problem with many potential applications. However, registering vessels accurately is difficult as they often occupy a small portion of the image and their relative motion/deformation is swamped by the displacements seen in large organs such as the heart and the liver. Our registration method uses a vessel detection algorithm to generate a vesselness image (probability of having a vessel at any given voxel) which is used to construct a weighting factor that is used to modify the intensity metric to give preference to vascular structures while maintaining the larger context. Therefore, our proposing method uses fully data-driven calculated weights and needs no prior knowledge for the weight calculation. We applied our method to the registration of serial MRI lamb images obtained from studies on tissue engineered vascular grafts and demonstrate encouraging performance as compared to non-weighted registration methods.

Distributed source x-ray tube technology for tomosynthesis imaging

Tomosynthesis imaging requires projection images from different viewing angles. Conventional systems use a moving xray source to acquire the individual projections. Using a stationary distributed x-ray source with a number of sources that equals the number of required projections, this can be achieved without any mechanical motion. Advantages are a potentially faster image acquisition speed, higher spatial and temporal resolution and simple system design. We present distributed x-ray sources based on carbon nanotube (CNT) field emission cathodes. The field emission cathodes deliver the electrons required for x-ray production. CNT emitters feature a stable emission at high current density, a cold emission, excellent temporal control of the emitted electrons and good configurability. We discuss the use of stationary sources for two applications: (i) a linear tube for stationary digital breast tomosynthesis (sDBT), and (ii) a square tube for on-board tomosynthesis image-guided radiation therapy (IGRT). Results from high energy distributed sources up to 160kVp are also presented.

Intrathecal sufentanil decreases the median effective dose (ED50) of intrathecal hyperbaric ropivacaine for caesarean delivery

BACKGROUND

The addition of opioid to local anaesthetics has become a well-accepted practice of spinal anaesthesia for caesarean delivery. Successful caesarean delivery anaesthesia has been reported with the use of a low dose of intrathecal hyperbaric ropivacaine coadministered with sufentanil. This prospective, double-blinded study determined the median effective dose (ED50) of intrathecal hyperbaric ropivacaine with and without sufentanil for caesarean delivery, to quantify the sparing effect of sufentanil on the ED50 of intrathecal hyperbaric ropivacaine.

METHODS

Sixty-four parturients undergoing elective caesarean delivery with combined spinal-epidural anaesthesia were randomized into two groups: Group R (ropivacaine) and Group RS (ropivacaine plus sufentanil 5 microg). The initial dose of ropivacaine was 13 mg in Group R and 10 mg in Group RS. The effective dose was defined as a T(6) level attained within 10 min and no supplemental epidural anaesthetic required during surgery. Effective or ineffective responses determined, respectively, a 0.3 mg decrease or increase of the dose of ropivacaine for the next patient using an up-down sequential allocation.

RESULTS

The ED50 of intrathecal ropivacaine was 11.2 mg [confidence interval (CI) 95%: 11.0-11.6] in Group R vs. 8.1 mg (CI 95%: 7.8-8.3) in Group RS. Motor block was markedly more intense in Group R than in Group RS, and the incidence of shivering was lower in Group RS than in Group R. There were no differences in the onset time of sensory block or motor block, in the incidence of hypotension, nausea and vomiting.

CONCLUSION

Intrathecal sufentanil 5 microg produced a 28% reduction of ED50 of intrathecal hyperbaric ropivacaine for caesarean delivery.

Abdominal compartment syndrome associated with capillary leak syndrome after liver transplantation

Orthotopic liver transplantation was performed in a 49-year-old man with metastatic liver sarcoma. After surgery, both abdominal compartment syndrome (ACS) and capillary leak syndrome (CLS) developed. Exploratory laparotomy and colon exteriorization were performed. Five days later, a diagnosis of severe CLS was established, and hydroxyethyl starch was infused to prevent leakage of albumin. The patient gradually recovered over 3 weeks. Awareness of ACS and CLS is important to improve outcome because early diagnosis and immediate therapy are essential. Bladder pressure is a key factor in diagnosing ACS, and pressure of 35 mm Hg is an indication for decompressive laparotomy. During the early stage of CLS, hydroxyethyl starch but not albumin should be used to alleviate edema and hypoalbuminemia.

c-Abl and Arg tyrosine kinases regulate lysosomal degradation of the oncoprotein Galectin-3

Galectin-3 (Gal3) has important roles in tumor transformation and metastasis. This study shows that c-Abl and Abl-related gene (Arg) associate with and phosphorylate Gal3. The SH (Src homology)3 domains of c-Abl/Arg bind to a P(80)GPPSGP motif of Gal3, and Tyr79 and Tyr118 are the major tyrosine phosphorylation sites. A consequence of this interaction and phosphorylation is the significant impairment of chaperone-mediated autophagy of Gal3. Cells expressing Gal3 and treated with the c-Abl/Arg inhibitor STI571, Gal3-depleted cells, and Gal3-depleted cells expressing Gal3 phosphorylation mutants all display an increased sensitivity to apoptosis-inducing agents. In addition, tumor cells expressing the phosphorylation mutants show impaired tumorigenicity. These results partially explain the antiapoptotic effect of Abl and Arg. As tumors frequently overexpress Gal3, a c-Abl/Arg-specific inhibitor may potentially be applied along with other antitumor drugs to target the lysosomal degradation of Gal3 in tumor therapy.

New measurements of the European Muon Collaboration effect in very light nuclei

New Jefferson Lab data are presented on the nuclear dependence of the inclusive cross section from (2)H, (3)He, (4)He, (9)Be and (12)C for 0.3 < x < 0.9, Q(2) approximately 3-6 GeV(2). These data represent the first measurement of the EMC effect for (3)He at large x and a significant improvement for (4)He. The data do not support previous A-dependent or density-dependent fits to the EMC effect and suggest that the nuclear dependence of the quark distributions may depend on the local nuclear environment.

First Report of Verticillium Wilt of Grapevine (Vitis vinifera) Caused by Verticillium dahliae in China

Verticillium dahliae Kleb. causes Verticillium wilt in large numbers of crops all over the world. Common symptoms caused by the pathogen include yellowing, wilting of leaves, and discoloration in vascular tissue of the stem. In June 2007, symptoms of Verticillium wilt were observed in a grapevine (Vitis vinifera) field in the Shihezi Region of Xinjiang. To isolate the pathogen, stem segments (0.5 cm long) were surface sterilized with 1% HgCl₂ for 1 min and then dipped in 70% ethanol for 10 s. The sterilized tissues were rinsed with sterile water and incubated in the dark for 7 days at 25°C on potato dextrose agar (PDA) medium. The fungus growing from the diseased tissue showed dark colonies that produced verticillate conidiophores with two to three layers with colorless, ovoid, unicellular conidia and small, black microsclerotia, which are characteristics of V. dahliae (3). To confirm its identity, ribosomal DNA fragments (regions ITS1, 5.8S rDNA, and ITS4) were PCR amplified with primer pair ITS1/ITS4 (4) and sequenced (GenBank Accession No. FJ475122). Sequential analysis revealed that the rDNA region of the fungus isolated from grapevine was identical to that of a Greek strain of V. dahliae (GenBank Accession No. AF104926). Furthermore, the specific fragment (1,500 bp) of nondefoliating pathotype of V. dahliae (1) was PCR amplified from 24 grapevine isolates of V. dahliae collected in Xinjiang, indicating that the V. dahliae pathogen from Xinjiang is a nondefoliating pathotype. To verify the causal role of the isolated fungus, pathogenicity assays were conducted on 1-year-old seedlings of the Centennial seedless cultivar. Trimmed roots were submerged in a conidial suspension (1 × 10⁶ conidia/ml) for 30 min and sterile tap water was used as a control. The seedlings were transplanted into a pot containing 2:1 sterile mixture of peat/perlite (vol/vol). Plants were grown in a greenhouse at 25°C. Six Verticillium isolates were found to cause the same symptoms as in fields 50 days after inoculation. V. dahliae was successfully reisolated from the stems of inoculated plants. Control seedlings inoculated in sterile tap water remained healthy. Because grapevine (Vitis vinifera) is an economically important crop for fruit and winemaking material in Xinjiang, Verticillium wilt poses a threat. The disease has been previously reported in the United States (2), but to our knowledge, this is the first report from China. References: (1) E. Pérez Artés et al. Eur. J. Plant Pathol. 106:507, 2000. (2) W. C. Schnathorst and A. C. Goheen. Plant Dis. Rep. 61:909, 1977. (3) H. C. Smith. N. Z. J. Agric. Res. 8:450, 1965. (4) T. J. White et al. PCR Protocols. Academic Press, San Diego, CA, 1990.

Cell-free miR-10b and miR-21 as diagnostic biomarkers for malignant effusions

11035

Background: Numerous studies have proved the roles of tissue microRNAs (miRNAs) as biomarkers in cancer diagnosis. Cell-free miRNAs from plasma or serum have been shown to be good biomarkers in the diagnosis of cancers. Here we tried to explore the potential application of cell-free miRNAs as diagnostic biomarkers to discriminate malignant effusions from benign. Methods: To obtain a molecular signature for malignant effusions, a stem-loop real-time PCR was adopted to measure the expression of 23 tumor-related miRNAs. After a pre-screening for discarding low amount miRNAs in 10 samples (5 benign/5 malignant) and a proper internal control was identified, the expression levels of 7 miRNAs were further compared among 74 malignant effusion samples (35 gastric cancer-related ascites and 39 lung cancer-related plural effusions) and 30 benign effusions. miRNAs specifically associated with malignant effusions were derived from a training group (20 malignant/10 benign) and tested in a validation group (54 malignant/20 benign). All samples were confirmed by both pathological and clinical diagnosis. Results: miR-215 was employed as the reference RNA for its abundance and consistence. The expression of miR-10b was significantly different between benign and malignant effusions (P< 0.001). Furthermore, it was showed that miR-10b can distinguish malignant plural effusions with high accuracy (areas under the curve (AUC) of receiver operating characteristic (ROC) curve 0.98, 95% CI, 0.90 to 1.0, P< 0.001), and miR-21 can be used to discriminate malignant ascites (AUC of ROC curve 0.71, 95% CI, 0.56 to 0.83, P= 0.018). Conclusions: In the present study, we demonstrated that cell-free miRNA can serve as a novel diagnostic biomarker in distinguishing malignant from benign effusions.

No significant financial relationships to disclose.

A novel model including CXCR4 and CDK6 as potential predictive marker for docetaxel (doc) sensitivity in gastric cancer (GC)

e15548

Background: A growing body of evidence has shed light on biomarkers for chemotherapeutic agent sensitivity in gastric cancer (GC) treatment. It has been demonstrated β-tubulin Ш (TUBB3) and microtubule associated protein tau (MAPT) might be considered as potential markers for taxanes treatment. However, an integrated predictive model for docetaxel (doc) sensitivity is still needed to customized chemotherapy in gastric cancer. Methods: Doc resistant gastric cancer cell line was established by exposure to gradually increasing doc concentration on an intermittent dosage schedule. Microarray was performed to explore different gene expression levels between parental cells and resistant cells. 11 gastrointestinal cancer cell lines were used to validate gene levels by real-time quantitative PCR as well as doc cytotoxicity. Histoculture drug response assay (HDRA) was adopted to examine doc sensitivity in 25 surgically dissected GC specimens. Discrimination analyses were used to determine which linear combinations of these genes best distinguished responder patients from nonresponder patients by adding one more genes each time. Results: After functional analysis of microarray, a panel of 11 genes were further validated, which resulting 4 genes, CXCR4 (P=0.047), CDK6 (P=0.014), USP15 (P<0.001) and CDH1 (P=0.001) that correlated to the doc sensitivity. The mRNA levels of CXCR4 and CDK6 were significantly higher in resistant GC specimens (P=0.0298, 0.022 respectively). A final response index including 5 genes (CXCR4, CDK6, USP15, TUBB3 and MAPT) showed potential predictive value for doc associated chemotherapy with an accuracy of 84% (P=0.001). Conclusions: A predictive model with five genes for doc therapy was generated and showed novel predictive role in doc sensitivity in GC.

No significant financial relationships to disclose.

Reversion of physiological drug resistance of weakly basic drugs: The discovery of a new mechanism of PEG-PCL nanoparticles

e13528

Background: A number of studies have reported the superior antitumor effect of nanoparticles loading chemotherapeutics than the free agents, yet the underlying mechanism has not attract enough attention. The extracellular pH of cancer cells is lower than that of the intracellular pH. Due to this pH gradient, weakly basic drug will protonated extracellularly and display decreased intracellular concentration. In this study, we aimed to reveal a new mechanism of PEG-PCL nanoparticles, namely the reversion of physiological drug resistance. Methods: Tetradrine (Tet), an alkaloid isolated from traditional Chinese medicine, was incorporated into the diblock copolymer methoxy poly(ethylene glycol)-polycaprolactone (mPEG-PCL). In vitro cytotoxicity of free Tet and Tet-loaded nanoparticles at pH7.4 and pH6.8 was compared on four different cancer cell lines. Fluorescent particle cellular uptake study was also used. To evaluate the antitumor effect of the nanoparticles in a more complex model rather than monolayer cell culture, we used Histoculture Drug Resistance Assay (HDRA). The in vivo antitumor effect of the nanoparticles was also studied in ICR mice bearing H22 tumor with different in vivo pH values. Results: In vitro cytotoxicity study in four tumor cell lines showed that the cytotoxicity of free Tet decreased significantly (P<0.05) when the extracellular pH decreased from 7.4 to 6.8, while the cytotoxicity of Tet-loaded nanoparticles increased or didn’t change significantly. The possible mechanism may mainly be the endocytosis of nanoparticles, which was proven by fluorescent particle cellular uptake study. HDRA indicated better tissue penetration of nanoparticles over free Tet. As to in vivo study, the mice with in vivo tumor pH 6.8 and treated with Tet-loaded nanoparticles exhibited best tumor inhibit rate and mildest side effect, suggesting that the use of nanoparticles was more preferable than the manipulation of tumor pH by the use of basic water. Conclusions: Our study clearly demonstrated that the mPEG-PCL nanoparticles could overcome the drug resistance caused by low extracellular pH and enhance drug penetration in the tumor tissue, thus increasing the antitumor efficacy of weakly basic agents.

No significant financial relationships to disclose.

Results of conservative surgery for recurrent borderline ovarian tumors

OBJECTIVE

To evaluate the menstrual, fertility and recurrent results of conservative surgery for women with recurrent borderline ovarian tumors.

METHODS

Six patients with recurrent borderline ovarian tumors who had conservative surgery from 2000 to 2006 were identified from the Women's hospital, Zhejiang University database. The six patients (median age, 32 years) underwent fertility-sparing surgery, preserving the uterus and at least part of one ovary.

RESULTS

Five patients retained normal menstrual function. Three women had successful pregnancies, with a total of three live births and one abortion. The spontaneous pregnancy rate was 50%. The mean duration of follow-up was 32 months (range, 6-72); one of the six patients with recurrent borderline ovarian tumors developed recurrence once more. However no disease-related deaths occurred.

CONCLUSIONS

The second conservative surgery for patients with recurrent borderline ovarian tumors should still be considered for women who are young and desire preservation of fertility. The spontaneous pregnancy rate is satisfactory. However, careful follow-up is needed to detect recurrent disease.

ERCC1 mRNA levels and survival of advanced gastric cancer patients treated with a modified FOLFOX regimen

Molecular markers involved in DNA repair can help to predict survival in gastric cancer patients treated with 5-FU plus platinum chemotherapy. Excision repair cross-complementing 1 (ERCC1) and thymidylate synthase (TS) mRNA expression levels were assessed in advanced gastric cancer tumour samples using real-time quantitative PCR in 76 patients treated with a modified FOLFOX (biweekly oxaliplatin plus 5-FU and folinic acid) regimen. Median survival time in patients with low ERCC1 levels was significantly longer than in those with high levels (15.8 vs 6.2 months; P<0.0001). Patients with high TS levels had longer survival than those with low levels (12.2 vs 10.1 months; P=0.01). Forty-eight patients with low ERCC1 and high TS levels had a median survival of 16.1 months (P<0.0001). The hazard ratio for patients with high ERCC1 expression was 9.4 (P<0.0001). In patients with high mRNA levels of ERCC1, alternative chemotherapy regimens should be considered.

Difficulty of embryo-transfer (ET) and pregnancy rate based on the uterocervical angle

When the angle formed by the uterine body and cervical axes (uterocervical angle) was less than 115 degrees, a catheter for embryo transfer could not be smoothly inserted into the uterine body, and so a hard catheter was used, which significantly reduced the pregnancy rate and implantation rate. When the uterocervical angle measured before embryo transfer by ultrasonography is less than 115 degrees, careful preparation, such as catheter selection for embryo transfer and the setting of a longer operation time, is necessary.