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Lesional Tissue (lesional + tissue)
Selected AbstractsInterferon gamma (IFN-,) may reverse oral submucous fibrosisJOURNAL OF ORAL PATHOLOGY & MEDICINE, Issue 1 2001M. F. Haque Abstract: Oral submucous fibrosis (OSF) is a chronic disease of the oral cavity and oropharyngx characterised by fibrosis in the submucosa leading to progressive limitation of the mouth opening. Interferon gamma (IFN-,) is a known anti-fibrotic cytokine. In this study we have investigated: a) the effect of IFN-, on collagen synthesis by arecoline-stimulated OSF fibroblasts in vitro (n=5), b) the effect of intra-lesional IFN-, on the fibrosis of OSF patients (n=29) and c) the immunohistochemical analysis of pre- and post-treatment inflammatory cell infiltrates and cytokine levels in the lesional tissue (n=29). The results show that the increased collagen synthesis in vitro in response to arecoline was inhibited in the presence of IFN-, (0.01,10.0 U/ml) in a dose-related way. In an open uncontrolled study intra-lesional IFN-, treatment showed improvement in the patients mouth opening from an inter-incisal distance before treatment of 21±7 mm, to 30±7 mm immediately after treatment and 30±8 mm 6-months later, giving a net gain of 8±4 mm (42%) (range 4,15 mm). Patients also reported reduced burning dysaesthesia and increased suppleness of the buccal mucosa. The post-treatment immunohistochemistry showed a decreased amount of inflammatory cell infiltrate and an altered level of cytokines compared with the pre-treatment lesional tissue. The effect of IFN-, on collagen synthesis appears to be a key to the treatment of these patients, and intra-lesional injections of the cytokine may have a significant therapeutic effect on OSF. [source] TNF-, expression and apoptosis-regulating proteins in oral lichen planus: a comparative immunohistochemical evaluationJOURNAL OF ORAL PATHOLOGY & MEDICINE, Issue 8 2000Alexandra Sklavounou Abstract: Apoptosis appears to be the mode of cell death by which damaged cells are removed from the lesional tissue in oral lichen planus (OLP). In the present study, OLP biopsies were immunohistochemically evaluated for TNF-, and apoptosis-regulating proteins in an attempt to compare their phenotypic expression. Deparaffinized tissue sections from 22 OLP and 10 control oral biopsy specimens were immunohistochemically stained with anti-Bcl-2, anti-Bcl-x, anti-Bax and anti-TNF-, antibodies. Keratinocytes did not show any immunoreactivity for Bcl-2, while a uniform intense staining for this protein was evident in the lymphocytic infiltrate of OLP specimens. Immunoreactivity for TNF-, was seen in 17/22 OLP cases. All control tissues were TNF-, negative, thus indicating a possible involvement of this cytokine in the pathogenesis of OLP. The differences in the staining intensities of Bcl-x and Bax between OLP and normal epithelium were slight; therefore an obvious association of the phenotypic TNF-, expression with these apoptosis-regulating proteins was not apparent. [source] Gadolinium-induced nephrogenic systemic fibrosis in a patient with an acute and transient kidney injuryBRITISH JOURNAL OF DERMATOLOGY, Issue 3 2008R.E. Kalb Summary Nephrogenic systemic fibrosis (NSF) describes a characteristic fibrosing disorder which typically presents with indurated plaques on the trunk and extremities of patients with advanced renal disease. We present a case of biopsy-confirmed NSF in a patient with severe acute kidney injury with no prior history of renal disease. A 64-year-old man with an acute and severe decrease in glomerular filtration rate underwent magnetic resonance imaging studies with gadolinium contrast (OmniscanÔ) and subsequently developed NSF. His renal disease had normalized at the time his skin disease developed. Skin biopsies revealed findings of NSF and scanning electron microscopy with energy-dispersive X-ray spectroscopy confirmed insoluble gadolinium within lesional tissue. [source] Infiltrating cells and related cytokines in lesional skin of patients with chronic idiopathic urticaria and positive autologous serum skin testEXPERIMENTAL DERMATOLOGY, Issue 5 2003M. Caproni Abstract:, In approximately one-third of patients with chronic idiopathic urticaria (CIU), autoantibodies against the high-affinity IgE receptor and/or against IgE can be detected and a wheal-and-flare response can be provoked by the intradermal injection of autologous serum (ASST). In this study we aimed to further characterize the inflammatory response observed in the subgroup of CIU patients with positive ASST and serum-evoked histamine-release in vitro from basophils in comparison with unaffected skin and healthy donors. An immunohistochemical analysis of infiltrating cells (CD4, MPO, EG1, EG2, tryptase), cytokines (IL-4, IL-5, IFN-,), chemokines and chemokine receptors (IL-8, CCR3, CXCR3), and adhesion molecules (ICAM-1, VCAM-1, ELAM-1) was performed on seven selected patients (four males and three females; median age: 45 years; range: 22,57) and five healthy donors. Cytokine evaluation was also performed in five psoriatic patients to obtain an additional control. In spontaneous wheals we observed an increased number of CD4+ T lymphocytes when compared with the controls, and an increased number of neutrophils and eosinophils, whereas mast cells did not show a significant variation. A significant expression for IL-4 and IL-5 could only be observed in lesional skin, while IFN-, showed a slight expression in the same site. Chemokine receptors CCR3 and CXCR3 did not show a defined polarized response in either lesional or unaffected skin. An increased expression of all cellular adhesion molecules (CAMs) studied was detected in spontaneous wheals. The lack of a significant difference in the expression of tryptase + mast cells, T lymphocytes, IL-8, CXCR3 and CCR3, a few CAMs between the lesional and unaffected skin of CIU patients suggests a wide immunological activation that involves not only lesional tissues, but possibly extends to the whole of the skin's immune system. [source] | ||||||||||