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  • Abdul-Hussein, Saba, et al. (författare)
  • Expression profiles of muscle disease-associated genes and their isoforms during differentiation of cultured human skeletal muscle cells.
  • 2012
  • Ingår i: BMC musculoskeletal disorders. - 1471-2474. ; 13
  • Tidskriftsartikel (refereegranskat)abstract
    • BACKGROUND: The formation of contractile myofibrils requires the stepwise onset of expression of muscle specific proteins. It is likely that elucidation of the expression patterns of muscle-specific sarcomeric proteins is important to understand muscle disorders originating from defects in contractile sarcomeric proteins.METHODS: We investigated the expression profile of a panel of sarcomeric components with a focus on proteins associated with a group of congenital disorders. The analyses were performed in cultured human skeletal muscle cells during myoblast proliferation and myotube development.RESULTS: Our culture technique resulted in the development of striated myotubes and the expression of adult isoforms of the sarcomeric proteins, such as fast TnI, fast TnT, adult fast and slow MyHC isoforms and predominantly skeletal muscle rather than cardiac actin. Many proteins involved in muscle diseases, such as beta tropomyosin, slow TnI, slow MyBPC and cardiac TnI were readily detected in the initial stages of muscle cell differentiation, suggesting the possibility of an early role for these proteins as constituent of the developing contractile apparatus during myofibrillogenesis. This suggests that in disease conditions the mechanisms of pathogenesis for each of the mutated sarcomeric proteins might be reflected by altered expression patterns, and disturbed assembly of cytoskeletal, myofibrillar structures and muscle development.CONCLUSIONS: In conclusion, we here confirm that cell cultures of human skeletal muscle are an appropriate tool to study developmental stages of myofibrillogenesis. The expression of several disease-associated proteins indicates that they might be a useful model system for studying the pathogenesis of muscle diseases caused by defects in specific sarcomeric constituents.
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  • Abdul-Hussein, Saba, et al. (författare)
  • Phenotypes of Myopathy-Related Beta-Tropomyosin Mutants in Human and Mouse Tissue Cultures
  • 2013
  • Ingår i: Plos One. - 1932-6203. ; 8:9
  • Tidskriftsartikel (refereegranskat)abstract
    • Mutations in TPM2 result in a variety of myopathies characterised by variable clinical and morphological features. We used human and mouse cultured cells to study the effects of β-TM mutants. The mutants induced a range of phenotypes in human myoblasts, which generally changed upon differentiation to myotubes. Human myotubes transfected with the E41K-β-TM(EGFP) mutant showed perinuclear aggregates. The G53ins-β-TM(EGFP) mutant tended to accumulate in myoblasts but was incorporated into filamentous structures of myotubes. The K49del-β-TM(EGFP) and E122K-β-TM(EGFP) mutants induced the formation of rod-like structures in human cells. The N202K-β-TM(EGFP) mutant failed to integrate into thin filaments and formed accumulations in myotubes. The accumulation of mutant β-TM(EGFP) in the perinuclear and peripheral areas of the cells was the striking feature in C2C12. We demonstrated that human tissue culture is a suitable system for studying the early stages of altered myofibrilogenesis and morphological changes linked to myopathy-related β-TM mutants. In addition, the histopathological phenotype associated with expression of the various mutant proteins depends on the cell type and varies with the maturation of the muscle cell. Further, the phenotype is a combinatorial effect of the specific amino acid change and the temporal expression of the mutant protein.
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  • Abraha, Desalegn (författare)
  • Command Economy as Failed Model of Development Lessons Not Yet Learned : The Case of Eritrea
  • 2010
  • Ingår i: Journal of Management Policy and Practice. - North American Business Press. - 1913-8067. ; 11:5, s. 49-68
  • Tidskriftsartikel (refereegranskat)abstract
    • The aim of this article is to identify which economic model is applied in Eritrea. The government claims to follow the market economy model(s), however, the actual practice seems to be different and casts doubts on the government's commitment to market economy. Against this background, the author has examined Eritrea's economic development model. Confirming to his doubts, the author found out that the government is applying a militarist command economy model, however, in an improperly planned, poorly coordinated and extremely mismanaged approach, with its serious negative impacts on the economic, social, cultural, diplomatic and political conditions in the country.
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  • Abraha, Desalegn, et al. (författare)
  • From industrial networks to strategic alliances or vice-versa
  • 2009
  • Ingår i: International Journal of Business and Emerging Markets. - InderScience Publishers. - 1753-6219. ; 1:4, s. 361-386
  • Tidskriftsartikel (refereegranskat)abstract
    • The purpose of this paper is: to highlight the impact of industrial networks on strategic alliances; to determine if alliances help firms to build up new or strengthen existing networks; to find out whether alliances succeed or precede networks. Our findings show that well-developed networks have a positive impact on how alliances function and the results that they can achieve. The other finding is that alliances defend and strengthen networks, and also enable firms to build new ones or penetrate those of their alliance partner(s). The final conclusion is that it is difficult to determine if alliances succeed or precede networks.
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