Aims: To assess differences in the pattern of subepithelial myofibroblasts and the expression of tenascin as a marker of extracellular matrix production in collagenous and lymphocytic colitis.
Methods And Results: Colorectal biopsies were studied from 122 patients with chronic diarrhoea and normal colonoscopy. The pathological diagnoses were collagenous colitis (n = 35), lymphocytic colitis (n = 37), mild non-specific chronic inflammation (n = 28) and normal mucosa (n = 18). Four cases showed features of collagenous colitis but with collagen bands <10 micro m thick. Normal mucosa from 14 patients without diarrhoea served as healthy control tissue. Immunohistochemical expression of alpha-smooth muscle actin (myofibroblast marker) and tenascin was evaluated in well-orientated sections. The expression of alpha-smooth muscle actin was significantly increased in collagenous colitis compared with all the other groups. Strong tenascin subepithelial expression was seen in all cases of collagenous colitis, including the four without full-blown features. The mean thickness of tenascin bands was greater than that obtained by conventional stains.
Conclusions: There are clear differences, with respect to extracellular matrix remodelling, between collagenous and lymphocytic colitis. These results support the theory of matrix overproduction in the genesis of collagenous colitis.
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http://dx.doi.org/10.1046/j.1365-2559.2003.01650.x | DOI Listing |
Acta Histochem
January 2025
Section of Anatomy and Histology, Imaging Platform, Department of Experimental and Clinical Medicine, University of Florence, Largo Brambilla 3, Florence 50134, Italy. Electronic address:
Epidemic keratoconjunctivitis (EKC) is one of the most severe clinical manifestations of human adenovirus ocular surface infection, which may lead to the formation of subepithelial infiltrates (SEIs) in the anterior corneal stroma in 20-50 % of cases. SEIs may be asymptomatic or give rise to corneal aberrations and visual impairment for months or years after acute infection, despite treatments. Here, we describe the ultrastructural and immunophenotypic features of the anterior corneal stroma of a patient who underwent superficial anterior lamellar keratoplasty (SALK) surgery to remove corneal opacities related to clinically significant and steroid-unresponsive, long-lasting SEIs after adenoviral EKC.
View Article and Find Full Text PDFVestn Oftalmol
December 2024
Krasnov Research Institute of Eye Diseases, Moscow, Russia.
Unlabelled: Excessive production of extracellular matrix is a key component in the pathogenesis of Salzmann's nodular degeneration (SND). studies of drugs that suppress excessive fibroblast activity may become crucial in developing pathogenetically oriented treatments for SND.
Purpose: This study evaluates the antifibrotic properties of pirfenidone and cyclosporine A (CsA) on cell cultures obtained from patients with SND.
iScience
December 2024
Translational Cancer Medicine Program, University of Helsinki, 00014 Helsinki, Finland.
Enteroendocrine cells (EECs) differentiate and mature to form functionally distinct populations upon migration along the intestinal crypt-villus axis, but how niche signals affect this process is poorly understood. Here, we identify expression of Glial cell line-derived neurotrophic factor (GDNF) in the intestinal subepithelial myofibroblasts (SEMFs), while the GDNF receptor RET was expressed in a subset of EECs, suggesting GDNF-mediated regulation. Indeed, GDNF-RET signaling induced increased expression of EEC genes including , encoding for the rate-limiting enzyme for 5-hydroxytryptamine (5-HT, serotonin) biosynthesis, and increased the frequency of 5-HT+ enterochromaffin cells (ECs) in mouse organoid culture experiments and .
View Article and Find Full Text PDFiScience
November 2024
Tomas Lindahl Nobel Laureate Laboratory, The Seventh Affiliated Hospital of Sun Yat-sen University, Shenzhen 518107, China.
Cell Rep
July 2024
Department of Genetics, University of Groningen, University Medical Center Groningen, 9700 RB Groningen, the Netherlands. Electronic address:
Human induced pluripotent stem cell (hiPSC)-derived intestinal organoids are valuable tools for researching developmental biology and personalized therapies, but their closed topology and relative immature state limit applications. Here, we use organ-on-chip technology to develop a hiPSC-derived intestinal barrier with apical and basolateral access in a more physiological in vitro microenvironment. To replicate growth factor gradients along the crypt-villus axis, we locally expose the cells to expansion and differentiation media.
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