Browsing by Subject "Desmin"

Now showing 1 - 3 of 3
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    Disorganization of honey-comb immunoreactive pattern of desmin and plectin in rat atrophic soleus muscle fiber induced by hindlimb suspension
    (Murcia : F. Hernández, 2002) Nara, S.; Hachisuka, K.; Furukawa, H.; Doi, Y.; Kudo, H.; Fujimoto, S.
    Immunoreactivity for desmin, plectin and a- actinin was inve s t i gated in rat atrophic soleus muscle fibers induced by hindlimb suspension between 1 and 4 weeks (hindlimb suspension group, HSG), and compared with that of the control group (CG). Some of the HSG for 4 weeks were allowed unrestricted cage activity for 2 weeks as the recovery group (RG). In the cross-sectioned muscle fibers of the CG, desmin and plectin show e d h o n ey-comb immunoreactive patterns ex t e n d i n g throughout the sarcoplasm. Superimposed images by double immunofluorescence labeling show e d overlapping of both immunoreactivities. In the longitudinally sectioned profiles, superimposed images of a-actinin and desmin were overlapped at the level of Z-discs. The focal disorganization of the above honey - comb immunoreactive patterns, followed by the reduction of the cross-sectional area (CSA) of atrophic soleus muscle fibers and the appearance of Z-streaming, uniquely arose in the HSG from the first week and extended throughout the sarcoplasm in proportion to the suspension period. Such honey-comb patterns of both desmin and plectin were already restored in the RG at 2 weeks, followed by the disappearance of Z-streaming, prior to the recovery of the CSA. These findings indicate that the disorganization of topological and structural relationships of desmin and plectin with Z-discs surrounding individual myofibrils is primarily evo ke d , which leads to Z-streaming of atrophic soleus muscle fibers, and that the restoration of the muscle activity results in an early arrangement recovery of desmin and plectin around myofibrils.
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    Expression of cytoskeletal proteins and ATPase activity in bovine femoral artery and vein intima
    (Murcia : F. Hernández, 1996) Trosheva, M.; Dikranian, K.; Nikolov, Sp.
    Intima1 cells play an important role in the biology of the vascular wall. Variability in the metabolic activity of intimal smooth muscle cells (SMC), as well as the differential expression of cellular cytoskeletal proteins depend on factors such as degree of differentiation, aging, atherosclerosis, etc. Myosin ATPase activity and cytoskeletal proteins were studied in the intima of bovine femoral arteries and veins of mature animals. In some arteries the intima was thickened and two distinct layers - inner elastic hyperplastic (EHL) and outer, musculo-elastic (MEL) were observed. ATPase activity was well defined in endothelial cells (EC) as well as in SMC. However, differential enzymatic expression was observed in thickened intimas. SMC in the EHL were ATPase negative, while in the MEL they were ATPase positive. Al1 EC and SMC in the «normal» intimas were vimentin positive, desmin and cytokeratin negative. In vessels with thickened intimas, the EHL showed intensive vimentin positivity; in the MEL desmin immunoreactive SMC were numerous as were as those in the media. Vimentin-positive SMC occupied their innermost part. Differences in the expression of ATPase activity and cytoskeletal proteins is discussed in terms of possible migration of media1 SMC andlor morphological modulation observed in vessels with altered vascular walls.
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    Small cell carcinoma of the stomach: An immunohistochemical and electron microscopic study
    (Murcia : F. Hernández, 1992) Morikawa, Y.; Tohya, K.; Matsuura, N.; Matsumoto, K.; Kakudo, K.
    A 4 x 6 cm ulcerative mass in the antrum was found to consist of papillary adenocarcinoma in the surrounding wall and the small round cell neoplasm at its base. Immunohistochemical staining revealed that elements of the papillary adenocarcinoma were positive for carcinoembryonic antigen, epithelial membrane antigen, keratin, endocrine granule constituent, and CA19-9, while components of the small cell carcinoma were weakly positive only for neuron-specific enolase. In one portion of the small cell carcinoma, particularly large cells with pleomorphic nuclei which were intensely positive for desmin were detected. Electron microscopic examination revealed dense-cored granules and intercellular junctions in the small neoplastic cells and bundles of intermediate filaments in the desmin-positive large cells. These findings suggest that ultrastmctural examination is vital in diagnosis of smail cell carcinoma and they reveal the capability of this carcinoma toward multidirectional differentiation.