Der immunhistochemische Nachweis von SMURF1 und SMURF2 im humanen osteoarthritischen Knorpel und Meniskus
Immunohistochemical detection of SMURF1 and SMURF2 in human osteoarthritic cartilage and meniscus
by Katharina Ruth Kröber
Date of Examination:2018-11-05
Date of issue:2018-10-29
Advisor:Prof. Dr. Nicolai Miosge
Referee:Prof. Dr Arndt Schilling
Referee:Prof. Dr. Rainer Mausberg
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Abstract
English
Osteoarthritis (OA) is a degenerative joint disease whose pathogenesis is still not fully understood. The study of signaling pathways in cartilage tissue and meniscus tissue, such as the transforming growth factor beta (TGF-β), represents an important approach to research for understanding the pathomechanisms of OA. The proteins SMAD ubiquitination regulatory factor 1 (SMURF1) and SMURF2 are two regulators of the TGF-β signaling pathway. This study investigates human osteoarthritic cartilage and meniscus tissue of the knee joint with the help of immunohistochemistry on these two proteins. Prior to the immunohistochemical study, the tissue samples were histologically classified in order to identify possible differences in the immune reaction of preparations with various degrees of degeneration. For cartilage tissue, the Mankin scale was used as the basis for histopathological evaluation. As for the graduation of the meniscus tissue currently no established evaluation systems exists, the cuts were classified on the basis of an evaluation system, which includes the specific pathological degenerative changes in the meniscus. All examined cartilage and meniscus preparations showed a positive immunohistochemical result for SMURF1 and SMURF2. Between cartilage tissue and meniscus tissue of different degrees of degeneration, no significant differences in the detection of SMURF proteins were identified. However, some cartilage and meniscus sections showed a zonal differentiated staining. The present results indicate that SMURF1 and SMURF2 are detectable in human osteoarthritic cartilage and meniscus tissue, suggesting that SMURF proteins play an important role in the pathology of OA in the meniscus and cartilage tissue.
Keywords: SMURF1; SMURF2; Immunohistochemistry; osteoarthritis of the knee joint