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      Anterior Uveitis Accompanies Joint Disease in a Murine Model Resembling Ankylosing Spondylitis

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          Background: Uveitis is often associated with a systemic inflammatory disease such as ankylosing spondylitis. Our understanding of the eye’s susceptibility to immune-mediated uveitis as in the apparent absence of infection has been limited by a relative lack of experimental models. Here we sought to assess whether ocular inflammation occurs in a previously described murine model of proteoglycan-induced spondylitis, wherein mice develop progressive spondylitis, sacroiliitis and peripheral arthritis – features common to the clinical presentations of ankylosing spondylitis. Methods: Using intravital microscopy we examined the ocular inflammatory response after the onset of arthritis in mice that overexpressed the T cell receptor (TCR) specific for a dominant arthritogenic epitope of cartilage proteoglycan [TCR-Tg (transgenic) mice] or BALB/c controls. Results: Immunized TCR-Tg mice showed a significant increase in the number of rolling and adhering cells within the iris vasculature compared to adjuvant control mice. Cellular infiltration within the iris tissue, as assessed by intravital microscopy and histology, was also increased. Our initial temporal analysis has revealed that immunized TCR-Tg mice show a significant increase in intravascular inflammation by 2 weeks after immunization, but it diminishes at 4 weeks after immunization. Conclusions: Although these data are preliminary, this model has the potential to clarify the mechanisms accounting for the coexistence of eye and sacroiliac inflammation as occurs in patients with ankylosing spondylitis.

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          Most cited references 26

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          Normal luminal bacteria, especially Bacteroides species, mediate chronic colitis, gastritis, and arthritis in HLA-B27/human beta2 microglobulin transgenic rats.

          Genetic and environmental factors are important in the pathogenesis of clinical and experimental chronic intestinal inflammation. We investigated the influence of normal luminal bacteria and several groups of selected bacterial strains on spontaneous gastrointestinal and systemic inflammation in HLA-B27 transgenic rats. Rats maintained germfree for 3-9 mo were compared with littermates conventionalized with specific pathogen-free bacteria. Subsequently, germfree transgenic rats were colonized with groups of five to eight bacteria that were either facultative or strictly anaerobic. Transgenic germfree rats had no gastroduodenitis, colitis, or arthritis, but developed epididymitis and dermatitis to the same degree as conventionalized rats. Colonic proinflammatory cytokine expression was increased in transgenic conventionalized rats but was undetectable in germfree and nontransgenic rats. Colitis progressively increased over the first 4 wk of bacterial exposure, then plateaued. Only transgenic rats colonized with defined bacterial cocktails which contained Bacteroides spp. had colitis and gastritis. Normal luminal bacteria predictably and uniformly induce chronic colonic, gastric and systemic inflammation in B27 transgenic F344 rats, but all bacterial species do not have equal activities.
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            Spontaneous inflammatory disease in transgenic rats expressing HLA-B27 and human β2m: An animal model of HLA-B27-associated human disorders

            Humans who have inherited the human class I major histocompatibility allele HLA-B27 have a markedly increased risk of developing the multi-organ system diseases termed spondyloarthropathies. To investigate the role of B27 in these disorders, we introduced the B27 and human beta 2-microglobulin genes into rats, a species known to be quite susceptible to experimentally induced inflammatory disease. Rats from one transgenic line spontaneously developed inflammatory disease involving the gastrointestinal tract, peripheral and vertebral joints, male genital tract, skin, nails, and heart. This pattern of organ system involvement showed a striking resemblance to the B27-associated human disorders. These results establish that B27 plays a central role in the pathogenesis of the multi-organ system processes of the spondyloarthropathies. Elucidation of the role of B27 should be facilitated by this transgenic model.
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              The nonrandom distribution of facial hemangiomas.

              To map sites of occurrence of facial infantile hemangiomas and correlate these with pattern of tumor growth, clinical complications, and proximity to structural and developmental landmarks. A retrospective medical record review of 205 patients diagnosed with facial infantile hemangioma. Arkansas Children's Hospital, Little Rock, a 250-bed teaching hospital affiliated with the University of Arkansas for Medical Sciences. Based on their clinical photographs, 232 of the hemangiomas were mapped on a facial schematic. Each lesion was encoded with a number reflective of its location, and this number was shared by other lesions occurring at the same site. Frequencies of complicating ulceration and airway obstruction were determined by medical record review. Two patterns of tumor growth were evident among the hemangiomas analyzed: focal (177 lesions [76.3%]) and diffuse (55 lesions [23.7%]). The focal hemangiomas mapped to 22 sites of occurrence, all near lines of mesenchymal or mesenchymal-ectodermal embryonic fusion. The 55 diffuse hemangiomas showed a segmental tissue distribution and thus were designated as frontonasal (15 lesions [27%]), maxillary (19 lesions [35%]), or mandibular (21 lesions [38%]). Ulceration was 3 times more common in patients with diffuse hemangiomas (21 [51%] of 41) than in patients with focal hemangiomas (28 [17%] of 164). Airway obstruction was characteristic of diffuse mandibular hemangiomas. Facial infantile hemangiomas occurred in 2 distinct patterns of tissue involvement: a focal type with a tumorlike appearance and a less common diffuse type with a plaquelike appearance. The diffuse lesions were more likely to be complicated by ulceration or airway obstruction and showed a strikingly segmental distribution pattern. Focal hemangiomas, in contrast, showed a predilection for regions of embryological fusion.

                Author and article information

                Ophthalmic Res
                Ophthalmic Research
                S. Karger AG
                April 2008
                18 April 2008
                : 40
                : 3-4
                : 189-192
                aCasey Eye Institute, Oregon Health and Science University, and bVeterans Affairs Medical Center, Portland, Oreg., and cRush University Medical Center, Chicago, Ill., USA; dUtrecht University, Utrecht, The Netherlands
                119874 Ophthalmic Res 2008;40:189–192
                © 2008 S. Karger AG, Basel

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                Page count
                References: 44, Pages: 4

                Vision sciences, Ophthalmology & Optometry, Pathology

                Ankylosing spondylitis, Murine, Uveitis


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