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Sökning: WFRF:(Willén Roger) > (2005-2009) > Engelska

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1.
  • Agnarsdóttir, Margrét, et al. (författare)
  • Malacoplakia and spermatic granuloma complicating vasectomy
  • 2006
  • Ingår i: Upsala Journal of Medical Sciences. - 0300-9734 .- 2000-1967. ; 111:2, s. 227-230
  • Tidskriftsartikel (refereegranskat)abstract
    • Malacoplakia is a granulomatous disease with a histiocytic infiltrate containing calcified structures called Michaelis-Gutmann bodies. These structures are considered to represent an abnormal response to infection involving defective lysosomes and abnormal microbubular assembly. The disease most frequently involves urinary and genital tracts, but has also been described from most other organs. Here we present the first case of malacoplakia only involving the vas deferens.
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2.
  • Bjursten, Malin, 1976, et al. (författare)
  • Long-term treatment with anti-alpha 4 integrin antibodies aggravates colitis in G alpha i2-deficient mice.
  • 2005
  • Ingår i: European journal of immunology. - : Wiley. - 0014-2980 .- 1521-4141. ; 35:8, s. 2274-83
  • Tidskriftsartikel (refereegranskat)abstract
    • Targeted deletion of the heterotrimeric G protein, Galphai2, in mice induces lethal colitis closely resembling ulcerative colitis. In chronic colitis, migration of circulating leukocytes into the intestinal mucosa is partially dependent on alpha4 integrins. In previous studies, short-term administration of anti-alpha4 integrin antibodies has been shown to attenuate intestinal inflammation, and here we elucidate the effect of long-term administration of anti-alpha4 integrin antibodies on colitis in Galphai2(-/- )mice. Long-term blockade of alpha4 integrin significantly increased the severity of colitis in Galphai2(-/-) mice. The inflammation was confined to the colon, associated with increased cancer in situ, destruction of crypt architecture, and increased production of IL-1beta, TNF-alpha and IFN-gamma. Blockade of alpha4 integrin reduced the recruitment of activated T cells to the small intestine. In strong contrast, there were significantly higher numbers of activated T cells in the colonic lamina propria and epithelium, most probably due to in situ proliferation. Furthermore, treatment with alpha4 integrin antibodies induced decreased levels of total IgA and IgG in sera, whereas total IgM levels were unchanged. These new findings may have implications in the understanding of the progression of chronic intestinal inflammation.
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3.
  • Bjursten, Malin, 1976, et al. (författare)
  • Transfer of colitis by Galphai2-deficient T lymphocytes: impact of subpopulations and tissue origin.
  • 2005
  • Ingår i: Inflammatory bowel diseases. - 1078-0998. ; 11:11, s. 997-1005
  • Tidskriftsartikel (refereegranskat)abstract
    • To elucidate the potential cell population(s) involved in the induction of colitis in inhibitory G protein Galphai2(-/-) mice, Galphai2-deficient or competent bone marrow or splenic and mesenteric lymph node (MLN) T cells were transferred into immunodeficient mice. The mice were followed up to 23 weeks after transfer, recording changes in body weight. Colitis was graded on hematoxylin and eosin-stained colonic tissue, and production of serum interleukin-18 and colon-derived interferon-gamma was measured using ELISA. After adoptive transfer of Galphai2(-/-) bone marrow, severe colitis developed in irradiated wild type recipients, whereas irradiated Galphai2(-/-) mice increased their life span more than 3 times after transfer of wild type bone marrow, accompanied by significant amelioration of colitis. Neither purified Galphai2(-/-) CD4(+), nor CD8(+) splenic or MLN-derived T cells could induce colitis in recombination-activating gene V(RAG) 2(-/-) recipient mice, whereas transfer of splenic Galphai2(-/-) CD3(+) T cells induced severe colitis. In contrast, transfer of Galphai2(-/-) CD3(+) T cells from the MLN caused only minor histopathological changes in the intestinal mucosa. Finally, serum levels of interleukin-18 and interferon-gamma production from colonic tissue cultures correlated well with disease severity. Our results show that bone marrow transplantation can prolong the life of Galphai2(-/-) mice and ameliorate intestinal inflammation. Splenic CD4(+) or CD8(+) T cells on their own were poor inducers of colitis, whereas the combination of both was highly involved in the induction of intestinal inflammation. Furthermore, we show that the tissue origin of CD3(+) T cells is critical for their potency to induce colitis.
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4.
  • Dahlgren, Eva, et al. (författare)
  • Sertoli-Leydig cell tumour in a postmenopausal woman showing all facets of the insulin resistance syndrome (IRS)
  • 2005
  • Ingår i: Ups J Med Sci. - 0300-9734. ; 110:3, s. 233-6
  • Tidskriftsartikel (refereegranskat)abstract
    • Sertoli-Leydig cell tumours are rare sex stromal tumours with an incidence of < 0.5% of all ovarian tumours. Most frequently this tumour occurs in young women with a history of amenorrhoea, hirsutism and lowered pitch. Here, we report on a woman with IRS, postmenopausal virilization and increased testosterone levels due to a Sertoli-Leydig cell tumour. This is the first case to suggest an association between IRS and Sertoli-Leydig cell tumours. Furthermore, we highlight the difficulties in detecting this ovarian tumour with sonography.
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5.
  • Elgbratt, Kristina, 1969, et al. (författare)
  • Aberrant T-cell ontogeny and defective thymocyte and colonic T-cell chemotactic migration in colitis-prone Galphai2-deficient mice
  • 2007
  • Ingår i: Immunology. - : Wiley. - 0019-2805 .- 1365-2567. ; 122:2, s. 199-209
  • Tidskriftsartikel (refereegranskat)abstract
    • Galphai2-deficient mice, which spontaneously develop colitis, have previously been reported to have an increased frequency of mature, single positive thymocytes compared to wild-type mice. In this study we further characterized the intrathymic changes in these mice before and during overt colitis. Even before the onset of colitis, Galphai2(-/-) thymi weighed less and contained fewer thymocytes, and this was exacerbated with colitis development. Whereas precolitic Galphai2(-/-) mice had unchanged thymocyte density compared to Galphai2(+/-) mice of the same age, this was significantly decreased in mice with colitis. Thymic atrophy in Galphai2(-/-) mice involved mainly the cortex. Using a five-stage phenotypic characterization of thymocyte maturation based on expression of CD4, CD8, TCRalphabeta, CD69 and CD62L, we found that both precolitic and colitic Galphai2(-/-) mice had significantly increased frequencies of mature single-positive CD4(+) and CD8(+) medullary thymocytes, and significantly reduced frequencies and total numbers of immature CD4(+) CD8(+) double-positive thymocytes compared to Galphai2(+/-) mice. Furthermore, cortical and transitional precolitic Galphai2(-/-) thymocytes showed significantly reduced chemotactic migration towards CXCL12, and a trend towards reduced migration to CCL25, compared to wild-type thymocytes, a feature even more pronounced in colitic mice. This impaired chemotactic migration of Galphai2(-/-) thymocytes could not be reversed by increased chemokine concentrations. Galphai2(-/-) thymocytes also showed reduced expression of the CCL25 receptor CCR9, but not CXCR4, the receptor, for CXCL12. Finally, wild-type colonic lamina propria lymphocytes migrated in response to CXCL12, but not CCL25 and, as with thymocytes, the chemokine responsiveness was significantly reduced in Galphai2(-/-) mucosal lymphocytes.
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6.
  • Fredin, Maria Fritsch, 1970, et al. (författare)
  • The application and relevance of ex vivo culture systems for assessment of IBD treatment in murine models of colitis
  • 2008
  • Ingår i: Pharmacological Research. - : Elsevier BV. - 1043-6618 .- 1096-1186. ; 58:3-4, s. 222-231
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this study was to investigate the relevance of mouse ex vivo cultures as a first screening model for new therapeutic agents of Inflammatory Bowel Disease (IBD). Two murine models (dextran sodium sulphate (DSS)-induced colitis and Gαi2-deficient mice) and two anti-inflammatory agents (methyl-prednisolone and the proteasome inhibitor MG132) were evaluated. The in vivo effects of methyl-prednisolone were assessed in both models. Ex vivo colonic tissue from both mouse models were cultured in the presence or absence of the drugs and TaqMan Low-Density arrays were used to assess the regulation of inflammatory genes before and after drug treatment. Colitis induced a similar inflammatory gene profile in both mouse models in in vivo studies and in ex vivo cultures. The differences encountered reflected the different phases of colitis in the models, e.g. innate cytokine/chemokine profile in the DSS model and T cell related markers in Gαi2-deficient mice. After steroid treatment, a similar pattern of genes was suppressed in the two mouse models. We confirmed the suppression of inflammatory gene expression for IL-1β, IL-6 and iNOS in ex vivo and in vivo colons from both mouse models by quantitative RT-PCR. Importantly, the inflammatory responses in the murine ex vivo culture system reflected the in vivo response in the inflamed colonic tissue as assessed by changes in inflammatory gene expression, suggesting that the murine culture system can be used for validation of future IBD therapies.
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7.
  • Lindahl, Bengt, et al. (författare)
  • Adenocarcinoma Corpus Uteri Stage I-II : Results of a Treatment Programme Based upon Cytometry
  • 2009
  • Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 29:11, s. 4731-4735
  • Tidskriftsartikel (refereegranskat)abstract
    • The results of a treatment method on adenocarcinoma corpus uteri stage I-II based upon cytometrically measured DNA ploidy are presented. All patients had a simple hysterectomy. Adjuvant treatment (postoperative vaginal brachytherapy) were given only, to those patients with non-diploid tumours regardless of stage and grade. A total of 1,634 women with endometroid adenocarcinoma corpus uteri stage I-II were included where 1,396 patients were followed-up for at least 5 years or until death and the remaining 238 patients were followed-up 3.5-5 years or until death. By using cytometry only, we identified a low-risk group comprising 83% of the patients (with 52% dead from their disease) and a high-risk group of 17% (with 15.7% dead from their disease). By using grade only (well- and moderately differentiated vs poorly differentiated), the low-risk group comprised 87% of the patients (with 4.6% dead from their disease) and the high-risk group 13% (with 13% dead from their disease). By using stage only (stage Ia and Ib vs stage Ic and II), the low-risk group comprised 78% of the patients (with 3.6% dead from their disease) and the high risk group 22% (with 14.5% dead from their disease). By combining these prognostic parameters, we were able to identify small subgroups with increased mortality rates in need of adjuvant therapy. As ploidy still had a strong prognostic strength regardless of given adjuvant radiotherapy, we do not believe that this treatment was effective. We therefore recommend future research to be directed toward cytostatics as an alternative adjuvant treatment.
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8.
  • Lindahl, Bengt, et al. (författare)
  • Adjuvant tamoxifen in breast cancer patients affects the endometrium by time, an effect remaining years after end of treatment and results in an increased frequency of endometrial carcinoma
  • 2008
  • Ingår i: Anticancer Research. - 0250-7005 .- 1791-7530. ; 28:2B, s. 1259-1262
  • Tidskriftsartikel (refereegranskat)abstract
    • Tamoxifen is the most used adjuvant drug in breast cancer treatment. Its main action is as an anti-oestrogen, but in the endometrium of some patients it acts as an oestrogen. Some investigators have even reported an increased risk of developing endometrial carcinoma. The question of how to follow-up these patients and how to identify patients at risk of developing endometrial premalignant changes was investigated by the noninvasive ultrasound method. The follow-up of 292 patients from before the start of adjuvant treatment with tamoxifen and 94 without tamoxifen treatment was conducted at regular intervals. The changes in endometrial thickness as measured by ultrasound and histopathological changes are reported. A thicker endometrium was found in patients with receptor positive breast cancer even before the treatment with tamoxifen started. Cumulative increasing thickness was found during treatment and this thicker endometrium remained until almost 3 years after the end of treatment. If the endometrium was <3 mm after 3 months of treatment the probability that it would be thin after 5 years was high. An increased risk of developing endometrial carcinoma was found, however due to this regular follow-up the cancer was identified at an early stage.
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9.
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10.
  • Nilsson, Ingrid, et al. (författare)
  • Helicobacter ganmani infection associated with a spontaneous outbreak of inflammatory bowel-like disease in an IL-10-deficient mouse colony
  • 2008
  • Ingår i: Scandinavian Journal of Laboratory Animal Science. - 0901-3393. ; 35:1, s. 13-24
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: A breeding colony of IL-10 deficient B6.129P2-Il10(tmICgn/J) mice, kept under conventional conditions, developed an inflammatory bowel-like disease (IBD) with rectal prolapse and blood tinged diarrhoea. No clinical signs of disease were observed at the time of arrival to our animal house. These animals were originally planned to serve as a negative control group in an experimental infection study with Helicobacter species to investigate colonization of the murine gut. Results: A spiral-shaped, Gram-negative bacterium was isolated from the breeding mice colony. In a first group of six animals, tissue specimens from the liver, small and large intestines, faeces and blood, were analysed by culture, PCR-denaturing gradient gel electrophoresis (PCR-DGGE), species-specific PCR assays and DNA-sequencing, histology and serology. Helicobacter ganmani, but no other Helicobacter species, was isolated from the liver, small bowel, caecum, colon and faeces. We found inflammation in caeca, colon and livers, most pronounced in the caecal areas of culture positive mice with a severe typhlitis with cystic dilatation of glandular structures and irregular crypt architecture. Some animals showed a pronounced colitis with mucosal and sub-mucosal inflammatory infiltrates. Other animals displayed large lymphoid infiltrates in the livers and hepatitis. Tissue samples and sera from 18 additional animals from the same breeding colony were analysed by the same methods, except for culture. H. ganmani was identified by PCR in most tissue samples of the 18 additional animals as well. Sero-conversion to H. ganmani correlated well with histopathological changes. Conclusions: Our findings emphasize the importance of using Helicobacter-free animals to develop murine models of chronic hepatitis and colitis.
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