The calpain–calpastatin system and protein degradation in fusing myoblasts

AbstractCalpain (Ca2+-activated cysteine protease) induced proteolysis has been suggested to play a role in myoblast fusion. We previously found that calpastatin (the endogenous inhibitor of calpain) diminishes markedly in myoblasts during myoblast differentiation just prior to the start of fusion, allowing Ca2+-induced calpain activation at that stage. Here, we show that a limited degradation of some proteins occurs within the myoblasts undergoing fusion, but not in proliferating myoblasts. The protein degradation is observed at the stage when calpastatin is low. Protein degradation within the myoblasts and myoblast fusion are inhibited by EGTA, by the cysteine protease inhibitors calpeptin and E-64d and by calpastatin. The degradation appears to be selective for certain myoblast proteins. Integrin β1 subunit, talin and β-tropomyosin are degraded in the fusing myoblasts, whereas α-actinin, β-tubulin and α-tropomyosin are not. A similar pattern of degradation is observed in lysates of proliferating myoblasts when Ca2+ and excess calpain are added, a degradation that is inhibited by calpastatin. The results support the notion that degradation of certain proteins is required for myoblast fusion and that calpain participates in the fusion-associated protein degradation. Participation of calpain is made possible by a change in calpain/calpastatin ratio, i.e., by a diminution in calpastatin level from a high level in the proliferating myoblasts to a low level in the differentiating myoblasts. Degradation of certain proteins, known to be responsible for the stability of the membrane–skeleton organization and for the interaction of the cell with the extracellular matrix, would allow destabilization of the membrane and the creation of membrane fusion-potent regions

A Delphi study to determine the European core curriculum for Master programmes in genetic counselling.

Genetic counsellors have been working in some European countries for at least 30 years. Although there are great disparities between the numbers, education, practice and acceptance of these professionals across Europe, it is evident that genetic counsellors and genetic nurses in Europe are working autonomously within teams to deliver patient care. The aim of this study was to use the Delphi research method to develop a core curriculum to guide the educational preparation of these professionals in Europe. The Delphi method enables the researcher to utilise the views and opinions of a group of recognised experts in the field of study; this study consisted of four phases. Phases 1 and 4 consisted of expert workshops, whereas data were collected in phases 2 and 3 (n=35) via online surveys. All participants in the study were considered experts in the field of genetic counselling. The topics considered essential for genetic counsellor training have been organised under the following headings: (1) counselling; (2) psychological issues; (3) medical genetics; (4) human genetics; (5) ethics, law and sociology; (6) professional practice; and (7) education and research. Each topic includes the knowledge, skills and attitudes required to enable genetic counsellors to develop competence. In addition, it was considered by the experts that clinical practice should comprise 50% of the educational programme. The core Master programme curriculum will enable current courses to be assessed and inform the design of future educational programmes for European genetic counsellors

Facing legal barriers regarding disclosure of genetic information to relatives

Leading research projects are evidence of the growing public interest in genetic diagnosis and treatment. In this context, disclosure of genetic information to relatives has become a prominent issue. However, this involves patient confidentiality, which is grounded in law and conflicts with disclosure to relatives. When conducting a legal and bioethical discussion in this context, it is first necessary to examine how clinicians perceive the role of law in their practice and how they interpret it. A qualitative study was therefore conducted among clinicians in Israel. The findings indicate that the clinicians’ approach is more relational than that of the law, in view of their pro-active steps to ensure that familial information reaches the relatives when the patient is reluctant to convey this information themselves. In light of these findings the authors argue that the law can resolve situations of explicit and implicit refusal to inform relatives

Whose informational needs are considered? A comparison between cancer patients and their spouses' perceptions of their own and their partners' knowledge and informational needs

The present study examines information exchange patterns between 98 married couples in Israel where one is a cancer patient and the other is the main caregiver. Specifically, the accuracy of each spouse's perception of the extent of knowledge and the need to receive more disease-related information is examined as a function of the role (patient-caregiver) and gender of the participants. The results showed that women, regardless of their role, were inaccurate in their perception of their husbands' knowledge and motivation to know more. For men, a difference between the roles was found for the perception of their wives' knowledge. As caregivers, they were inaccurate while as patients they were accurate in this estimation. Their perception of their wives' needs to know more was accurate. Moreover, female patients, more than male, relied on their perception of themselves when assessing their spouse's knowledge and informational needs. Thus, it is concluded that female patients were more egocentric and their perception of their spouse's preferences was influenced by their own needs. The results demonstrated that in the context of cancer patients and their spouse as caregivers, neither partner considered the informational needs of his or her spouse.Cancer Informational needs Caregivers Gender Perceptions Israel

Privacy and utility of genetic testing in families with hereditary cancer syndromes living in three countries: the international cascade genetic screening experience

Background: Hereditary breast and ovarian cancer and Lynch syndrome are associated with increased lifetime risk for common cancers. Offering cascade genetic testing to cancer-free relatives of individuals with HBOC or LS is a public health intervention for cancer prevention. Yet, little is known about the utility and value of information gained from cascade testing. This paper discusses ELSI encountered during the implementation of cascade testing in three countries with national healthcare systems: Switzerland, Korea, and Israel.Methods: A workshop presented at the 5th International ELSI Congress discussed implementation of cascade testing in the three countries based on exchange of data and experiences from the international CASCADE cohort.Results: Analyses focused on models of accessing genetic services (clinic-based versus population-based screening), and models of initiating cascade testing (patient-mediated dissemination versus provider-mediated dissemination of testing results to relatives). The legal framework of each country, organization of the healthcare system, and socio-cultural norms determined the utility and value of genetic information gained from cascade testing.Conclusion: The juxtaposition of individual versus public health interests generates significant ELSI controversies associated with cascade testing, which compromise access to genetic services and the utility and value of genetic information, despite national healthcare/universal coverage