64 research outputs found
Enhanced Cellular Uptake of Virus by Increased Expression Levels of the Coxsackie-and Adenovirus Receptor
Replicationâselective oncolytic adenoviruses have shown great promise as novel anti-cancer agents. These mutant viruses act through different mechanisms than traditional anti-cancer therapies and consequently do not develop cross-resistance with these drugs. A limiting factor for success with cancer treatment using oncolytic adenoviruses is the delivery and entry of virus to the correct target cells. An important step in adenoviral adsorption to host cells is the interaction between cellular CAR and viral fibre domains. Reports have indicated a down-regulation of CAR- levels in various cancer cell lines and clinical specimens. Enhancing the expression of CAR could potentially increase the efficacy of treatment with oncolytic adenoviruses. In this project, prostate cancer cell lines have been evaluated for their sensitivity to adenoviral infection, with and without treatment with the MEK-inhibitors PD98059, U0126 and the histone deacetylase inhibitor Trichostatin A. Trichostatin A was found to be a potent enhancer of sensitivity to viral-induced cytopathic effect in prostate cancer cell lines. Furthermore, prostate cancer cell lines have been evaluated for their surface expression of CAR, uptake of adenovirus and adenoviral replication with and without treatment with Trichostatin A. Trichostatin A was found to enhance CAR- expression and adenoviral uptake in some prostate cancer cell lines but did not have any significant effects on adenoviral replication. In conclusion, Trichostatin A could be used to improve the effects of oncolytic adenoviruses in treatment of prostate cancer through enhanced expression of CAR.Onkolytiska virus Ă€r en ny behandlingsmetod för cancer, som utnyttjar helt andra verkningsmekanismer Ă€n gĂ€ngse lĂ€kemedel och behandlingsformer. Adenovirus Ă€r smĂ„ DNA-virus som infekterar epitelceller, replikerar, sprĂ€nger sin vĂ€rdcell och sprider sig i vĂ€vnaden. Onkolytiska adenovirus Ă€r modifierade pĂ„ sĂ„dant sĂ€tt att de selektivt angriper tumörceller och lĂ€mnar friska celler oskadda. För att adherera till vĂ€rdcellerna binder adenovirus med sitt âfibreâ-protein till CAR (Coxsackie-adenovirus receptor) och tar sig sedan in genom cellmembranet genom att utnyttja integriner pĂ„ cellytan. Mycket litet Ă€r kĂ€nt om CA-receptorns fysiologiska funktioner, den tros vara en celladhesionsmolekyl, men kan ocksĂ„ vara inblandad i kommunikation celler emellan. MĂ€ngden CAR varierar mellan olika celltyper och Ă€r genomgĂ„ende nedreglerad i flera typer av avancerade tumörer. Att kunna uppreglera CAR skulle potentiellt kunna förbĂ€ttra cancerbehandling med onkolytiska adenovirus. I detta projekt har cellinjer frĂ„n prostatatumörer screenats för kĂ€nslighet mot adenovirusinfektion, med och utan behandling av MEK-hĂ€mmarna PD98059, U0126 och histone deacetylase-hĂ€mmaren Trichostatin A. Trichostatin A visades sig kunna förstĂ€rka kĂ€nsligheten mot virus hos de anvĂ€nda cellinjerna. DĂ€refter undersöktes samma cellinjer för att se om deras uttryck av CAR pĂ„ cellytan, upptag av virus och virusreplikation förĂ€ndrades efter behandling med Trichostatin A. Efter behandling ökade bĂ„de uttrycket av CAR och upptaget av virus i de flesta cellinjer, dĂ€remot sĂ„gs inga förĂ€ndringar av virusreplikationen. Sammantaget visade denna studie att Trichostatin A skulle kunna anvĂ€ndas för att förbĂ€ttra behandling av prostatacancer med onkolytiska adenovirus genom att öka uttrycket av CAR hos vĂ€rdcellerna
Inflammatory bowel disease, colorectal neoplasia and treatment with ursodeoxycholic acid in primary sclerosing cholangitis
Background: Primary sclerosing cholangitis (PSC) is a chronic cholestatic liver
disease closely associated with inflammatory bowel disease. PSC is progressive and
ultimately leads to death or need for liver transplantation. Patients are also at high risk
of developing colorectal neoplasia (CRN).
Aims: The main aim of this thesis was to study IBD in patients with PSC. We aimed to
describe the phenotype of Crohnâs disease (CD) in patients with PSC and to determine
the risks of CRN and IBD activity before and after liver transplantation. The secondary
aim was to study the drug ursodeoxycholic acid (UDCA) in patients with PSC and
UDCAs effect on the development of CRN and survival in PSC.
Results: In Paper I we investigated CD in 28 patients with PSC and compared them
with a matched control group of 46 patients with CD without PSC. We found that
smoking, perianal fistulas, bowel strictures and small bowel involvement were rare in
PSC patients. We also found a significantly increased risk for development of CRN in
PSC patients (P=0.001, log rank).
Papers II and III are multicentre studies of IBD in PSC patients undergoing liver
transplantation (OLT), and include all liver-transplanted Nordic PSC patients (n=439).
The IBD activity was increased after transplantation and the choice of
immunosuppression influenced the activity. A univariate analysis identified age <20
years at diagnosis of IBD, use of tacrolimus, and dual therapy with tacrolimus and
mycophenolate mofetil as significant risk factors for worsening of IBD, whereas dual
treatment with cyclosporine A and azathioprine showed a significant protective effect.
The cumulative risk of any type of neoplasia in the group of patients still at risk after
OLT (n=244, 36 cases of neoplasia) was higher than the corresponding number before
OLT (353, 52 cases) (HR: 1.9: 95% CI 1.3-2.9, P = 0.002).
In Papers IV and V the effect of UDCA at a dose of 17-23 mg/kg in patients with PSC
was evaluated using an extended follow-up of a previous randomised controlled trial. In
paper IV all patients with concomitant IBD at risk for CRN were included (n=98).
There was no detectable difference in dysplasia- and cancer-free survival when the
groups were compared using the Kaplan-Meier method (p = 0.73 log-rank test). Paper
V evaluated the effect of UDCA on long-term survival without liver transplantation. No
difference in endpoint-free survival was detected between UDCA treated and untreated
patients. However we found that a reduction in alkaline phosphatase (ALP) by 40% or
more was associated to significantly better long-term survival in patients with PSC (P =
0.0001, log rank).
Conclusions: Our studies show that patients with IBD and PSC have a high risk of
developing CRN regardless of IBD phenotype, and that the risk of CRN and IBD
activity increases after OLT and appears correlated to the type of immunosuppression
given. In patients undergoing OLT a shift from the present standard maintenance
treatment with tacrolimus and mycophenolate mofetil to cyclosporine A and
azathioprine should be considered. The evidence that UDCA improves survival in PSC
or that it should be used as a chemopreventive agent in PSC-IBD is weak. ALP is a
marker for disease progression in PSC and should be used in future clinical trials
BENCHOP - The BENCHmarking project in Option Pricing
The aim of the BENCHOP project is to provide the finance community with a common suite of benchmark
problems for option pricing. We provide a detailed description of the six benchmark problems together
with methods to compute reference solutions. We have implemented fifteen different numerical methods
for these problems, and compare their relative performance. All implementations are available on line and can be used for future development and comparison
Bees increase seed set of wild plants while the proportion of arable land has a variable effect on pollination in European agricultural landscapes
Background and aims - Agricultural intensification and loss of farmland heterogeneity have contributed to population declines of wild bees and other pollinators, which may have caused subsequent declines in insect-pollinated wild plants. Material and methods - Using data from 37 studies on 22 pollinator-dependent wild plant species across Europe, we investigated whether flower visitation and seed set of insect-pollinated plants decline with an increasing proportion of arable land within 1 km. Key results - Seed set increased with increasing flower visitation by bees, most of which were wild bees, but not with increasing flower visitation by other insects. Increasing proportion of arable land had a strongly variable effect on seed set and flower visitation by bees across studies. Conclusion - Factors such as landscape configuration, local habitat quality, and temporally changing resource availability (e.g. due to mass-flowering crops or honey bee hives) could have modified the effect of arable land on pollination. While our results highlight that the persistence of wild bees is crucial to maintain plant diversity, we also show that pollen limitation due to declining bee populations in homogenized agricultural landscapes is not a universal driver causing parallel losses of bees and insect-pollinated plants.Peer reviewe
Increased risk of colorectal cancer in patients diagnosed with breast cancer in women
BackgroundEpidemiological studies have shown a potential association between sex hormones and colorectal cancer. The risk of colorectal cancer in breast cancer patients who may have been exposed to increased levels of endogenous sex hormones and/or exogenous sex hormones (e.g. anti-hormonal therapy) has not been thoroughly evaluated.MethodsUsing the National Swedish Cancer Register we established a population-based prospective cohort of breast cancer patients in women diagnosed in Sweden between 1961 and 2010. Subsequent colorectal cancers were identified from the same register. Standardized incidence ratios (SIRs) and 95% confidence intervals (95%CIs) were used to estimate the risk of colorectal cancer after a diagnosis of breast cancer. The association between breast cancer therapy and risk of colorectal cancer was evaluated in a subcohort of breast cancer patients treated in Stockholm between 1977 and 2007. Hazard ratios (HRs) and 95%CIs were estimated using Cox regression models.ResultsIn a cohort of 179,733 breast cancer patients in Sweden, 2571 incident cases of colorectal cancer (1008 adenocarcinomas in the proximal colon, 590 in the distal colon and 808 in the rectum) were identified during an average follow-up of 9.68 years. An increased risk of colorectal adenocarcinoma was observed in the breast cancer cohort compared with that in the general population (SIR=1.59, 95%CI: 1.53, 1.65). Adenocarcinoma in the proximal colon showed a non-significantly higher SIR (1.72, 95%CI: 1.61, 1.82) compared with the distal colon (1.46, 95%CI: 1.34, 1.58). In the subcohort of 20,171 breast cancers with available treatment data, 299 cases with colorectal cancers were identified. No treatment-dependent risk of colorectal cancer was observed among the breast cancer patients.ConclusionAn increased risk of colorectal adenocarcinoma - especially in the proximal colon - was observed in the breast cancer cohort. Breast cancer treatment did not alter this risk
Recommended from our members
Non-bee insects are important contributors to global crop pollination
Wild and managed bees are well documented as effective pollinators of global crops of economic importance. However, the contributions by pollinators other than bees have been little explored despite their potential to contribute to crop production and stability in the face of environmental change. Non-bee pollinators include flies, beetles, moths, butterflies, wasps, ants, birds, and bats, among others. Here we focus on non-bee insects and synthesize 39 field studies from five continents that directly measured the crop pollination services provided by non-bees, honey bees, and other bees to compare the relative contributions of these taxa. Non-bees performed 25â50% of the total number of flower visits. Although non-bees were less effective pollinators than bees per flower visit, they made more visits; thus these two factors compensated for each other, resulting in pollination services rendered by non-bees that were similar to those provided by bees. In the subset of studies that measured fruit set, fruit set increased with non-bee insect visits independently of bee visitation rates, indicating that non-bee insects provide a unique benefit that is not provided by bees. We also show that non-bee insects are not as reliant as bees on the presence of remnant natural or seminatural habitat in the surrounding landscape. These results strongly suggest that non-bee insect pollinators play a significant role in global crop production and respond differently than bees to landscape structure, probably making their crop pollination services more robust to changes in land use. Non-bee insects provide a valuable service and provide potential insurance against bee population declines
Recurrence of primary sclerosing cholangitis after liver transplantation â analysing the European Liver Transplant Registry and beyond
New genetic loci link adipose and insulin biology to body fat distribution.
Body fat distribution is a heritable trait and a well-established predictor of adverse metabolic outcomes, independent of overall adiposity. To increase our understanding of the genetic basis of body fat distribution and its molecular links to cardiometabolic traits, here we conduct genome-wide association meta-analyses of traits related to waist and hip circumferences in up to 224,459 individuals. We identify 49 loci (33 new) associated with waist-to-hip ratio adjusted for body mass index (BMI), and an additional 19 loci newly associated with related waist and hip circumference measures (PÂ <Â 5Â ĂÂ 10(-8)). In total, 20 of the 49 waist-to-hip ratio adjusted for BMI loci show significant sexual dimorphism, 19 of which display a stronger effect in women. The identified loci were enriched for genes expressed in adipose tissue and for putative regulatory elements in adipocytes. Pathway analyses implicated adipogenesis, angiogenesis, transcriptional regulation and insulin resistance as processes affecting fat distribution, providing insight into potential pathophysiological mechanisms
Design of top of the range ceramic cooktop with emphasis on usability and interface
This projectâs aim is to develop a ceramic cooktop for the premier market suitable to be sold in Europe, America, Asia and Australia. The final concept is a ceramic cooktop that with as high profit margin as possible for Electrolux also appeals the most for high-end consumers from all over the world. Today ceramic cooktops from different producers have aesthetics very similar to each other and it is hard to differentiate one brand from another. Therefore by designing a cooktop that stands out from the rest, Electroluxâs aim to get in to the premier segment of the market and to profile itself there, would be possible to reach. A problem that soon was noticed was that the interface of cooktops often is very hard to understand and that the control panel technique can be experienced as unreliable. So, emphasis was, besides making an original design, also laid on making the cooktop as user friendly as possible. Facts and information about components were thoroughly read to get a good understanding of the product. Theory about how to make a proper benchmarking and also theories about symbols and gestalts were studied. Following and parallel to this, a systematic development work was conducted by further investigating the actual problem and customer needs. Kitchen standards all over the world were mapped to find out what dimensions the cooktop should have. The result of this was the benchmark form and the product specification. The benchmarking was then carried out by comparing cooktops made both by Electrolux and other producers. By following the benchmark form to grade each cooktop, conclusions about the design were made. User tests on the cooktops gave additional information about usability and interface issues. Dividing the design into sub areas in a screening matrix and brainstorming about these led to a wide range of ideas. The solutions to each area were then combined in different ways to create the best concepts. To choose one concept the necessity of desired criteriaâs were weighed against each other and then the concepts were scored by how well they fulfilled those. All this led up to the final concept, the Clear Cooktop. The dimensions of Clear are suited to fit the selected markets as good as possible. It has a smooth and easy to clean top surface consisting of two different types of ceramic glass, black above the elements, and a frosted clear glass piece where the control panel is. The control panel and the interface are developed with capacitive touch control technique in mind. This is a more reliable technique than the techniques used in existing cooktops. The interface, the new control panel technique and the unique combination of two different ceramic glasses will for sure make the cooktop stand out on the market.Validerat; 20101217 (root
The middle manager as a sensegiver : â to be a link between the strategic andthe operational
Mellanchefen agerar som lĂ€nk mellan den strategiska ledningen och den operativaverksamheten. Mellanchefen fĂ„r i uppdrag att förmedla de mĂ„l och intentioner strategiskaledningen önskar förverkliga ner till den operativa verksamheten. Genom kommunikation och sociala interaktioner översĂ€tter mellanchefen finansiella mĂ„l och strategier till konkretaarbetsprocesser. Tidigare forskning konstaterar att mellanchefen Ă€r klĂ€md mellan de strategiska- och operativacheferna, men utifrĂ„n vĂ„r bedömning saknas det forskning som klargör hur mellanchefen arbetar inom denna klĂ€mda roll. Genom vĂ„r undersökning önskade vi fĂ„ en inblick pĂ„ vilket sĂ€tt mellancheferna hanterar sin kommunikativa roll som förmedlare av mĂ„l och strategier. Undersökningens intention var Ă€ven att studera mellancheferna och hur de arbetar för att skapa förstĂ„else bland den operativa verksamheten för den mĂ„lbild som kommer frĂ„n den strategiska ledningen. Undersökning har genomförts pĂ„ SKF, ett svenskt tillverknings- och tjĂ€nsteföretag, varav vi har intervjuat 13 chefer. Med hjĂ€lp av sensemaking teorin har vi analyserat dessa intervjuer. Identifierat Ă€r att mellanchefens position utgör en viktig lĂ€nk inom organisationen, dĂ€r kommunikationen Ă€r en grundsten för att skapa förstĂ„else. Dock visar resultatet att mellancheferna fĂ„r olika förutsĂ€ttningar och kommunikativa verktyg för att arbeta med strategi, mĂ„lsĂ€ttning och förĂ€ndring. Med detta som bakgrund föreslĂ„r vi att praktiken arbetar mer med att skapa förstĂ„else för att nĂ„ uppsatta mĂ„l. SKF bör se kommunikation som lika viktig, vare sig det rör strategiarbete, förĂ€ndringsarbete eller mĂ„lsĂ€ttning. Vilket vi anser resulterar i att organisationen underlĂ€ttar mellanchefens kommunikativa roll.The middle manager acts as a link between the strategic management and the operational activities. The middle manager get commissioned to convey the objectives and intentions that the strategic management wish to fulfill, down to the operational activities. Through communication and social interactions, the middle manager translates the financial objectives and strategies to concrete work procedures. Previous research state that the middle manager is wringing between the strategic directors and the operational executives, but from our point of view there is a lack of research that clarify how the middle managers works within this wringing role. Through our study we wished to get a closer look to in which way the middle managers copes with their communicative role as intermediary of objectives and strategy. The researchâs intention is also to examine how the middle managers works with creating an understanding among the operational activities to reach the target set by the strategic management. The research has been conducted at SKF, a Swedish manufacturing and service company, whereof 13 interviews where performed. Using sensemaking theory to analyze the interviews. Identified is that the middle manager's position constitutes an important link within the organization, where communications is a foundation to create understanding. However, the results shows that the middle managers receive prerequisites and communication tools to work with strategy, objectives and alteration. With this in mind, we suggest that the practice active works with creating an understanding to grasp the objectives. SKF should perceive communication equally as important, no matter if it regards strategy, alteration and objectives. Which we consider would result in an ease on the middle manager and their communicative role. This thesis is written in Swedish
- âŠ