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- Abdelaal, Abdelrahman, et al.
(författare)
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Simultaneous occurrence of follicular and papillary thyroid carcinomas in same thyroid lobe : A case series of six patients from Qatar
- 2020
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Ingår i: International Journal of Surgery Case Reports. - : Elsevier. - 2210-2612. ; 73, s. 65-70
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Tidskriftsartikel (refereegranskat)abstract
- Background: Papillary thyroid carcinoma (PTC) and follicular thyroid carcinoma (FTC) are the first and second most common thyroid cancers comprising about 85% and 10% of all thyroid cancers. Simultaneous occurrence of medullary and papillary thyroid cancer has been reported with various presentations, but simultaneous occurrence of FTC in addition to PTC as differentiated cancers, is an unusual event that is rarely reported. Presentation of cases: We report our experience of six rare cases of synchronous coexistence of FTC and PTC with unique features. Case 1 is 31 old Egyptian female. Case 2 is a 61 year old Sudanese male. Case 3 is a 59 year old Sudanese male. Case 4 is a 56 years old Indian female. Case 5 is a 35 years old Filipina female. Case 6 is a 52 years old Qatari female. The six cases are special in their co-occurrence of two thyroid carcinoma, consisting of histologic features of follicular thyroid carcinomas, and classical papillary thyroid carcinoma, possibly the first case series of simultaneous occurrence of these two types of thyroid cancer in the Middle East and North Africa Region. Conclusions: We present rare cases of concurrent FTC and PTC. These six cases add more data highlighting the coincidental simultaneous coexistence of FTC and PTC. Endocrinologists and pathologists should be aware of and vigilant to this variety. © 2020 The Author(s)
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- Abdul-Hussein, Saba, et al.
(författare)
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Expression profiles of muscle disease-associated genes and their isoforms during differentiation of cultured human skeletal muscle cells
- 2012
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Ingår i: BMC Musculoskeletal Disorders. - : BioMed Central. - 1471-2474. ; 13
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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)
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Phenotypes of Myopathy-Related Beta-Tropomyosin Mutants in Human and Mouse Tissue Cultures
- 2013
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Ingår i: Plos One. - : Public Library of Science (PLoS). - 1932-6203. ; 8:9
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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 beta-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-beta-TMEGFP mutant showed perinuclear aggregates. The G53ins-beta-TMEGFP mutant tended to accumulate in myoblasts but was incorporated into filamentous structures of myotubes. The K49del-beta-TMEGFP and E122K-beta-TMEGFP mutants induced the formation of rod-like structures in human cells. The N202K-beta-TMEGFP mutant failed to integrate into thin filaments and formed accumulations in myotubes. The accumulation of mutant beta-TMEGFP 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 beta-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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- Abdulrazzaq, Sama, et al.
(författare)
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Is Revisional Gastric Bypass as Effective as Primary Gastric Bypass for Weight Loss and Improvement of Comorbidities?
- 2020
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Ingår i: Obesity Surgery. - : Springer. - 0960-8923 .- 1708-0428. ; 30, s. 1219-1229
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Tidskriftsartikel (refereegranskat)abstract
- Background: Revisional gastric bypass (R-RYGB) surgery is utilized for the management of inadequate weight loss or weight regain observed after some cases of bariatric surgeries. Data on the mid-term effectiveness of primary gastric bypass (P-RYGB) compared to R-RYGB (e.g., post sleeve gastrectomy or gastric banding) are controversial. Methods: Retrospective chart review of all patients who received P-RYGB and R-RYGB (January 2011 - June 2015) at our center. One hundred and twenty patients who underwent P-RYGB and 34 R-RYGB who completed 18 months follow-up were included. We compared the effectiveness of P-RYGB with R-RYGB by assessing four anthropometric, two glycemic, and four lipid parameters, as well as the control of type 2 diabetes (T2DM), hypertension and dyslipidemia in terms of remission, improvement, persistence, relapse and de novo. The current study also assessed mortality and complications rates. Results: There were no significant differences in the baseline characteristics of patients who received P-RYGB with those who received R-RYGB in terms of age, gender and preoperative BMI. However, at 18 months: a) Patients who received P-RYGB had lower mean weight (P = 0.001) and BMI (P <0.001), reflected by a higher mean delta BMI (P = 0.02), TWL%(P <0.0001) and EWL%(P < 0.0001); b) No differences were observed between the two patients groups in terms of glycemic parameters, lipid profiles, and control of T2DM, hypertension, and dyslipidemia; and, c) No deaths were reported among both patients groups, and complication rates were comparable. Conclusion: Although R-RYGB effectively addressed inadequate weight loss, weight regain and recurrence of comorbidities after restrictive bariatric surgery, R-RYGB resulted in inferior weight loss compared to P-RYGB. There were no significant differences between the two procedures in terms of their clinical control of T2DM, hypertension and dyslipidemia. Both procedures exhibited comparable complication rates.
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- Abraha, Desalegn, et al.
(författare)
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Acquiring Cross-Cultural Competence : Insights from International Firms in Four Countries
- 2016
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Ingår i: Entrepreneurship Development in a Globalized Era. ; , s. 1-13
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Konferensbidrag (refereegranskat)abstract
- Firms increasingly have to compete globally in order to survive. An understanding of the host country’s local culture arguably being one of the most important aspects of this survival. The greater the cultural difference, the higher the risk of miscommunication and of mismanagement. Given that cross-cultural management is acknowledged as an intrinsic part of firm establishment in foreign markets today, we set out to explore the linkages between the competence of international firms in managing cultural differences and the effectiveness of their business operations. How this ‘cross-cultural competence’ is acquired is of particular interest to this study. Swedish firms operating in Kenya, Lithuania, Poland and Russia are examined. The findings show that international firms tend not to formulate any preparatory measures to become ‘culturally competent’ prior to entering foreign markets. Learning takes place by doing. A Process Model of Acquiring Cross-Cultural Competence in Foreign Markets is constructed.
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