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Urology. 2002 Sep;60(3):521-6.
An Escherichia coli-based oral vaccine against urinary tract infections potently activates human dendritic cells.

Schmidhammer S, Ramoner R, Holtl L, Bartsch G, Thurnher M, Zelle-Rieser C.

Department of Urology, University of Innsbruck, Innsbruck, Austria.

OBJECTIVES: To investigate the effects of Uro-Vaxom, an oral vaccine against Escherichia coli urinary tract infections, on human monocyte-derived dendritic cells (moDCs). Dendritic cells (DCs) are important antigen-presenting cells of the immune system. DCs are considered promising cellular adjuvants for inducing immunity against cancer or infectious diseases. METHODS: moDCs were generated in the presence of granulocyte-macrophage colony-stimulating factor and interleukin-4. Flow cytometric phenotyping, as well as the ability to stimulate T cells in an allogeneic mixed leukocyte reaction, was used to assess the effects of Uro-Vaxom on human moDCs. In addition, interferon-gamma and interleukin-4 production by T cells stimulated with Uro-Vaxom-activated moDCs were measured by intracellular fluorescence-activated cell sorter-staining at the single-cell level. RESULTS: Uro-Vaxom induced the terminal maturation of CD83+ moDCs in a dose-dependent manner. Phenotypic analyses revealed that Uro-Vaxom-activated moDCs displayed a phenotype of mature DCs with high levels of MHC molecules and increased levels of co-stimulatory molecules (CD80, CD86). Consistent with these findings, Uro-Vaxom-activated moDCs potently stimulated T-cell proliferation and interferon-gamma production in the allogeneic mixed leukocyte reaction. CONCLUSIONS: In DC-based immunotherapy, Uro-Vaxom could be used as a stimulant of DC maturation, which meets the standards of good manufacturing practice. In future preclinical studies, we will evaluate the effectiveness of a vaccination with Uro-Vaxom-activated moDCs. It could be an attractive treatment option in preventing recurrent E. coli urinary tract infections in predisposed individuals.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12350510&dopt=Abstract

Hum Reprod. 2002 Oct;17(10):2529-34.
Isolation of human cationic antimicrobial protein-18 from seminal plasma and its association with prostasomes.

Andersson E, Sorensen OE, Frohm B, Borregaard N, Egesten A, Malm J.

Department of Laboratory Medicine, Division of Clinical Chemistry, Lund University, University Hospital MAS, SE- 205 02 Malmo, Sweden.

BACKGROUND: Cathelicidins are a group of antibiotic peptides with broad antimicrobial activity. They are considered to be an essential part of the innate immune system. The only known human cathelicidin is the human cationic antimicrobial protein (hCAP-18), from which the antimicrobial peptide LL-37 is released. METHODS AND RESULTS: In the present study, we purified hCAP-18 from seminal plasma and confirmed its identity by N-terminal amino acid sequencing. Gel filtration of seminal plasma showed the presence of hCAP-18 in both a low and a high molecular weight peak. Fractions corresponding to the high molecular form of hCAP-18 also contained dipeptidyl peptidase IV (CD26), a prostasome marker. This finding suggested that hCAP-18 found in fractions corresponding to high molecular weight molecules, is prostasome-associated. Flow cytometry confirmed the association of hCAP-18 with prostasomes and indicated that the molecule is surface bound. Western blot showed the presence of intact hCAP-18 in sperm, prostasomes and ultracentrifuged seminal plasma. CONCLUSIONS: These findings suggest that hCAP-18 may have an important role in antimicrobial defence during human reproduction. The binding of hCAP-18 to prostasomes indicates that protasomes can serve as a reservoir of this precursor of the antibiotic peptide LL-37.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12351523&dopt=Abstract

Nucl Med Commun. 2002 Oct;23(10):1009-17.
Tissue distribution of octreotide binding receptors in normal mice and strains prone to autoimmunity.

Ten Bokum AM, Rosmalen JG, Hofland LJ, Krenning EP, Van Hagen PM, Breeman WA.

Department of Immunology, Erasmus Medical Centre Rotterdam, Dr Molewaterplein 40, 3015 GD Rotterdam, Netherlands.

Somatostatin has diverse functions, including immunomodulatory functions. In humans, sites of active inflammation can be visualized by the administration of 111In-DTPA(0)-octreotide, a radiolabelled somatostatin analogue. We wished to establish an animal model for preclinical evaluation of the effects of somatostatin analogues on the immune system. However, most animal models for immunological diseases are murine. This report is a preliminary study of the distribution of somatostatin receptors in mouse tissues, with emphasis on the immune system. Tissue distribution of octreotide binding receptors in normal (BALB/c) mice was determined in vivo by receptor binding of 111In-DTPA(0)-octreotide and in vitro and ex vivo by receptor autoradiography. Additionally, we investigated the tissue distribution of octreotide binding receptors in inflammatory lesions in a murine model of immune mediated disease, i.e. pre-diabetic pancreatic infiltration in the non-obese diabetic mouse strain. High specific uptake of radioactivity was seen in the thymus (range 1-1.7% ID/g) and the pituitary (1-1.6% ID/g) in all mouse strains. Specific uptake was also found in the stomach (0.1-0.7% ID/g), in the adrenal glands (0.1-0.3% ID/g) and in the pancreas (0.1-0.3% ID/g). However, we did not detect increased uptake of radiolabelled octreotide in the pancreas of pre-diabetic NOD mice. Autoradiography on tissue sections confirmed the presence of octreotide binding sites in the tissues that showed specific uptake. Moreover, by using autoradiography we could localize the cortex of the thymus and the anterior part of the pituitary as the localization of specific and high affinity, octreotide binding sites. A high, but not a receptor mediated, uptake of radioactivity was seen in the kidneys and was significantly higher in females than in males (12-19% vs 4% ID/g, respectively). Our results point to profound species differences in the tissue distribution of octreotide binding receptors. Of particular interest is the high uptake of 111In-DTPA(0)-octreotide in the cortex of the mouse thymus. This offers perspectives for the use of this animal in studies concerning the effect of somatostatin analogues on the immune system. To our knowledge, this is the first report on the tissue distribution of octreotide binding receptors in mice. 2002 Lippincott Williams & Wilkins

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12352601&dopt=Abstract

Transplantation. 2002 Sep 15;74(5):619-23.
Tissue-engineered small intestine: ontogeny of the immune system.

Perez A, Grikscheit TC, Blumberg RS, Ashley SW, Vacanti JP, Whang EE.

Department of Surgery, Brigham and Women's Hospital, Boston, MA 02115, USA.

BACKGROUND: Using tissue-engineering techniques, we have developed a that regenerates structural and transporter properties of native jejunum. The purpose of this study was to characterize the mucosal immune system of the engineered neointestine. We hypothesized that the neointestinal mucosa is capable of developing a mature immunocyte population and that exposure to luminal stimuli is critical to this development. METHODS: Neointestinal cysts were engineered by implanting polymer-organoid constructs into syngeneic adult recipients. Neointestine (cysts left nonanastomosed [NA] and cysts anastomosed to native bowel [AN]) and native jejunum were harvested serially (3-56 weeks postoperatively). Immune cell subsets were characterized by the immunohistochemical detection of cell-specific antigens (T cells [CD3], B cells [CD32], NK cells [CD56], and macrophages [CD68]) combined with computer-based morphometry. RESULTS: Intraepithelial and lamina propria immunocyte population densities and subset distributions were identical in AN cysts harvested 20 weeks postoperatively and in native jejunum. Mucosal immunocyte population densities were lower in AN cysts harvested 10 weeks postoperatively and only rudimentary in NA cysts, even those harvested 20 weeks postoperatively. CONCLUSIONS: These results suggest that tissue-engineered intestine has the capacity to develop a mucosal immune system with an immunocyte population similar to that of native small intestine. The development of this immune system is a function of both exposure to luminal stimuli and the duration of this exposure. Tissue-engineered intestine offers promise as a new therapeutic approach for patients who have intestinal insufficiency.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12352876&dopt=Abstract

Transplantation. 2002 Sep 15;74(5):646-51.
Different kinetics of obliterative airway disease development in heterotopic murine tracheal allografts induced by CD4+ and CD8+ T cells.

Higuchi T, Jaramillo A, Kaleem Z, Patterson GA, Mohanakumar T.

Department of Surgery, Washington University School of Medicine, St. Louis, MO 63110, USA.

BACKGROUND: Both T and B cells have been shown to be implicated in the pathogenesis of bronchiolitis obliterans syndrome, which is considered to represent chronic lung allograft rejection. However, the relative contributions of T cells and alloantibodies in the pathogenesis of the disease are still unknown. In this study, we used an heterotopic murine tracheal transplantation model to determine the contribution of these components of the immune system in the pathogenesis of posttransplant obliterative airway disease (OAD). METHODS: Tracheal allografts from BALB/c and HLA-A2-transgenic (HLA-A2+) mice were heterotopically transplanted into C57BL/6, CD4-knockout (KO), CD8-KO, Ig-KO, and Rag1-KO mice. In additional experiments, recipient mice were pretreated with depleting antibodies against CD4+, CD8+, and NK1.1+ cells. Development of OAD was determined by histopathology at days 10, 30, 60, 90, and 180 after transplantation. RESULTS: HLA-A2+ allografts transplanted into C57BL/6, CD8-KO, and Ig-KO mice demonstrated OAD lesions by day 30. In contrast, allografts transplanted into CD4-KO mice showed no OAD lesions at day 30, partial OAD development by days 60 and 90, and complete OAD development by day 180. No OAD development was observed in allografts transplanted into Rag1-KO mice. Treatment with anti-NK1.1 antibody did not show any effect on posttransplant OAD development. In contrast, anti-CD4+ or anti-CD8+ antibody treatments partially reduced the OAD histopathology and combined anti-CD4/CD8 antibody treatment further abrogated the histopathology of the disease. CONCLUSION: These results show that both CD4+ and CD8+ T cells have a role in the pathogenesis of OAD and that natural killer cells and alloantibodies are not necessary for the development of this disease.

online pharmacy ref. source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12352880&dopt=Abstract

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