128 research outputs found
Cartilage oligomeric matrix protein is involved in human limb development and in the pathogenesis of osteoarthritis
No full textAs a member of the thrombospondin gene family, cartilage oligomeric protein ( COMP) is found mainly in the extracellular matrix often associated with cartilage tissue. COMP exhibits a wide binding repertoire and has been shown to be involved in the regulation of chondrogenesis in vitro. Not much is known about the role of COMP in human cartilage tissue in vivo. With the help of immunohistochemistry, Western blot, in situ hybridization, and real-time reverse transcription-polymerase chain reaction, we aimed to elucidate the role of COMP in human embryonic, adult healthy, and osteoarthritis (OA) cartilage tissue. COMP is present during the earliest stages of human limb maturation and is later found in regions where the joints develop. In healthy and diseased cartilage tissue, COMP is secreted by the chondrocytes and is often associated with the collagen fibers. In late stages of OA, five times the COMP mRNA is produced by chondrocytes found in an area adjacent to the main defect than in an area with macroscopically normal appearance. The results indicate that COMP might be involved in human limb development, is upregulated in OA, and due to its wide binding repertoire, could play a role in the pathogenesis of OA as a factor secreted by chondrocytes to ameliorate the matrix breakdown
Supplementary_information – Supplemental material for The independent prognostic impact of the GATA2 pioneering factor is restricted to ERG-negative prostate cancer
No full textSupplemental material, Supplementary_information for The independent prognostic impact of the GATA2 pioneering factor is restricted to ERG-negative prostate cancer by Franziska Büscheck, Maciej Zub, Asmus Heumann, Claudia Hube-Magg, Ronald Simon, Dagmar S Lang, Doris Höflmayer, Emily Neubauer, Frank Jacobsen, Andrea Hinsch, Andreas M Luebke, Maria Christina Tsourlakis, Guido Sauter, Hartwig Huland, Markus Graefen, Alexander Haese, Hans Heinzer, Torsten Schlomm, Till S Clauditz, Eike Burandt, Waldemar Wilczak, Stefan Steurer and Sarah Minner in Tumor Biology</p
Cartilage oligomeric matrix protein in the pathogenesis of osteoarthritis
No full textAls ein Mitglied der Thrombospondin-Gen-Familie, ist das Cartilage oligomeric matrix protein (COMP) hauptsächlich in der extrazellulären Matrix zu finden. Eine häufige Bindung an Knorpel konnte bereits nachgewiesen werten. Weiter ist COMP in Synovialflüssigkeiten und dem Bandhalteapparat nachweisbar. Es konnten bereits verschiedene Bindungs-möglichkeiten sowie eine Beteiligung an der Chondrogenese in vitro nachgewiesen werden. Über die Funktion von COMP in menschlichem Knorpel in vivo ist noch nicht viel bekannt. Mit Hilfe von licht- und elektronenmikroskopischer Immunhistochemie sowie In-situ-Hybridisierung war es unser Ziel mehr über die Rolle von COMP in menschlichen Knorpel Erwachsener herauszufinden. Hierzu wurde gesunder und osteoarthrotischer Knorpel untersucht. In gesundem sowie arthrotischem Knorpelgewebe konnte eine Sekretion von COMP nachgewiesen werden, wobei COMP häufig mit Kollagenfasern assoziiert ist.Im Rahmen der In-situ-Hybridisierung konnte bei den Versuchen am arthrotischen Knorpelgewebe beobachtet werden, dass in der Randzone zum Hauptdefekt eine fünffach höhere Menge an COMP-mRNA von den Chondrozyten produziert worden ist, als in dem makroskopisch gesund erscheinenden Knorpelregionen. Die Ergebnisse der Erhöhung von COMP im Rahmen der Osteoarthrose und das breite Bindungsspektrum des Proteins weisen darauf hin, dass es im Rahmen der Pathogenese der Arthrosis deformans von den Chondrozyten synthetisiert wird um einem Untergang der Knorpelmatrix entgegenzuwirken.As a member of the thrombospondin gene family, cartilage oligomeric protein (COMP) is found mainly in the extracellular matrix often associated with cartilage tissue as well as synovia and tendon. COMP exhibits a wide binding repertoire and has been shown to be involved in the regulation of chondrogenesis in vitro. Not much is known about the role of COMP in human cartilage tissue in vivo. With the help of light- and electronmicroscopic immunohistochemistry and in situ hybridization we aimed to elucidate the role of COMP in human adult healthy and osteoarthritis (OA) cartilage tissue. In healthy and diseased cartilage tissue, COMP is secreted by the chondrocytes and is often associated with the collagen fibers. In late stages of OA, five times the COMP mRNA is produced by chondrocytes found in an area adjacent to the main defect than in an area with macroscopically normal appearance. The results indicate that the upregulation of COMP in OA, due to its wide binding repertoire, could play a role in the pathogenesis of OA as a factor secreted by chondrocytes to ameliorate the matrix breakdown
The Length of the Transition Zone in Patients with Rectosigmoid Hirschsprung Disease
No full textBackground: The transition zone (TZ) is defined by specific histological findings in patients with Hirschsprung Disease (HSCR). HSCR treatment includes surgical removal of the aganglionic zone (AZ). During the pull-through procedure, it is critical to resect the TZ. Given the TZ’s wide histological heterogeneity, we wanted to know how extensive the histological transition zone is. Methods: A retrospective study of patients who had pull-through surgery for rectosigmoid HSCR between January 2010 and December 2020 was carried out. Demographics, length of TZ and AZ, age and symptoms upon presentation, and complications after surgery were also obtained. Results: The inclusion criteria were met by 50 patients. The mean age of all patients was 10 months (0.1–107.5 months), with a mean age at pull-through of 16.3 months (3–112 months). Thirty-one out of fifty patients (62%) received primary laparoscopic endorectal pull-through surgery (LEPT). The average TZ length of all patients was 2.6 cm (0–10 cm), and the AZ length was 9.6 cm (1–30 cm). The length of the AZ and TZ were shown to have no correlation (r² = 0.237). Conclusions: The current study found that the mean length of the TZ in individuals with rectosigmoid HSCR is less than 5 cm in most cases and has no correlation with the length of the AZ
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