24 results on '"Enberg B"'
Search Results
2. Work satisfaction, career preferences and unpaid household work among recently graduated health-care professionals - a gender perspective.
- Author
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Enberg B, Stenlund H, Sundelin G, and Öhman A
- Abstract
AIM: This study investigated perceptions of recently graduated health-care professionals towards healthcare work, preferences for future careers, work organisation and management. In addition, it scrutinised the impact of unpaid household work on work satisfaction using a gender theoretical analysis. METHOD: A questionnaire was distributed to 1035 nurses, occupational therapists and physiotherapists who graduated in the semester of spring 1999 in Sweden. The response rate was 81% and the respondents represent 3338 graduates. When estimating proportions and means, sampling weights reflecting the sampling design were used. RESULTS: Among both men and women, there was a high satisfaction with work in general, but a great dissatisfaction with work management and organisation. Multiple logistic regression analyses revealed a significant association between dissatisfaction with the work organisation and age groups and type of employment among the women. Younger women were more dissatisfied than older, and public employees were more dissatisfied than private employees. The women in the study did more unpaid household work than the men did. The data suggest that this can be of importance for the dissatisfaction at work, although this was not statistically significant. Working conditions and career preferences differ between the three professions as well as among men and women in the same profession. Geriatrics was not a preferred area for future work, although it is an area with predicted increasing personnel needs in the future. The results are discussed in relation to future needs for health-care personnel, gender and organisation theory. CONCLUSIONS: Because of the predicted scarcity of health-care personnel in Sweden, it is of importance that healthcare organisations address the issues of work satisfaction as well as possible competence drain. Gender equality in terms of working conditions is another important aspect that needs to be highlighted. [ABSTRACT FROM AUTHOR]
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- 2007
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3. Characterisation of novel missense mutations in the GH receptor gene causing severe growth retardation.
- Author
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Enberg, B., Luthman, H., Segnestam, K., Ritzén, E. M., Sundström, M., and Norstedt, G.
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- 2000
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4. The cellular mechanism of growth hormone signal transduction.
- Author
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Lobie, PE, Wood, TJJ, Sliva, D, Billestrup, N, Waters, MJ, Enberg, B, and Norstedt, G
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- 1994
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5. Growth Hormone Regulation of Gene Expression.
- Author
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NORSTEDT, G., ENBERG, B., MÖLLER, C., and MATHEWS, L.S.
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- 1990
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6. THE GROWTH HORMONE RECEPTOR DURING DEVELOPMENT.
- Author
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Norstedt, G., Enberg, B., Francis, S. M., and Lobie, P. E.
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- 1993
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7. Regulation of rat growth hormone receptor gene expression
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Mathews, L S, Enberg, B, and Norstedt, G
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- 1989
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8. Growth hormone (GH) induction of tyrosine phosphorylation and activation of mitogen-activated protein kinases in cells transfected with rat GH receptor cDNA
- Author
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Möller, C, Hansson, A, Enberg, B, Lobie, P.E., and Norstedt, G
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- 1992
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9. CLONING AND ANALYSIS OF EXPRESSION OF RAT GROWTH HORMONE RECEPTOR
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Mathews, L.S., Enberg, B., and Norstedt, G.
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- 1989
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10. Quality of life, physical activity, and social determinants in teenagers with cerebral palsy: A cross-sectional study in Sweden.
- Author
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Degerstedt F, Enberg B, Ng N, Keisu BI, and Björklund M
- Abstract
Background: The associations between physical activity and various social determinants with quality of life (QoL) among teenagers with cerebral palsy (CP) are inconclusive., Objective: To explore associations between perceived QoL among teenagers with CP in Sweden and participation in physical leisure activity and physical education in school, as well as sex, gross motor function, pain and bother, caregivers' birth country and socioeconomic status., Methods: A cross-sectional study with teenagers who have CP, aged 15-18 years. The survey, including the assessment form Cerebral Palsy Quality of Life-teenager (CP QoL-teen), was sent to all youths in the national patient registry held by the Swedish National Board of Health and Welfare (n = 900). Survey data was complemented with data from other national health registries containing information on demographics, physical leisure activity, physical education, and gross motor function. Multivariable linear- and quantile regression analyses were performed., Results: The survey was answered by 149 participants. Physical leisure activity was positively associated with the QoL-domain Communication and physical health. Gross motor function was associated with domains referring to physical function and participation; more severe motor difficulties indicated lower QoL. Pain was negatively associated with all QoL domains. Low caregiver educational levels were associated with higher social well-being domain., Conclusion: Minimizing pain and facilitating physical activity may enhance QoL for teenagers who have CP. To improve participation for teenagers with severe disabilities, with non-Nordic caregivers, and caregivers without postgraduate education, targeted measures to facilitate participation are needed., (Copyright © 2025. Published by Elsevier Inc.)
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- 2025
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11. Professional knowledge development and evidence-based practice in confusing vs. supportive work organizations: A grounded theory situational analysis of Swedish elderly care.
- Author
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Öhman A, Keisu BI, and Enberg B
- Subjects
- Humans, Grounded Theory, Sweden, Health Personnel, Evidence-Based Practice
- Abstract
Background: This article focuses on knowledge development and health professionals' opportunities to use evidence-based practice (EBP). We studied registered physiotherapists (PT), occupational therapists (OT) and nurses (RN) in Swedish elderly-care institutions, a sector known for high turnover and shortages of competent staff., Objective: To examine the perspectives of healthcare providers on professional knowledge development and EBP in their organization., Methods: We conducted on-site qualitative interviews with a purposive sample of PTs, OTs and RNs, in six elderly care institutions. Situational analysis was used to analyze the material., Results: Three discursive professional positions were found: 1) Professional ambition in confusing work organization; 2) Professional ambition in a knowledge-promoting work organization; and 3) Professional indifference with few aspirations for knowledge development. Professional aspirations toward knowledge development were high in two of these positions, whereas the third represents a slightly different approach with fewer aspirations for knowledge development. Linked to these professional approaches to knowledge development is a continuum of aggravating or facilitating factors within the work organization, including varying degrees of support from leadership of the organization, as well as few opportunities for rewards., Discussion and Conclusions: It is concluded that elderly care needs to develop strategies for evidence-based practice in order for the sector to become a sustainable arena for health professionals' career development, and in order to improve the quality of care for the elderly.
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- 2023
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12. Gender matters in physiotherapy.
- Author
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Stenberg G, Fjellman-Wiklund A, Strömbäck M, Eskilsson T, From C, Enberg B, and Wiklund M
- Subjects
- Humans, Physical Therapy Modalities education, Physical Therapists education
- Abstract
The World Health Organization states that gender has implications for health across the course of a person's life in terms of norms, roles and relations. It also has implications in rehabilitation. In this article, we argue the need of gender perspectives in the field of physiotherapy; gender matters and makes a difference in health and rehabilitation. We highlight a number of central areas where gender may be significant and give concrete examples of social gender aspects in physiotherapy practice and in diverse patient groups. We also discuss why it can be important to consider gender from an organizational perspective and how sociocultural norms and ideals relating to body, exercise and health are gendered. Further we present useful gender theories and conceptual frameworks. Finally, we outline future directions in terms of gender-sensitive intervention, physiotherapy education and a gendered application of the ICF model. We want to challenge physiotherapists and physiotherapy students to broaden knowledge and awareness of how gender may impact on physiotherapy, and how gender theory can serve as an analytical lens for a useful perspective on the development of clinical practice, education and research within physiotherapy.
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- 2022
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13. Unequal physical activity among children with cerebral palsy in Sweden-A national registry study.
- Author
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Degerstedt F, Björklund M, Keisu BI, and Enberg B
- Abstract
Aim: To examine the extent to which sex, country of birth, and functional aspects influence participation in physical education and physical leisure activity among children with cerebral palsy (CP) in Sweden., Methods: This national cross-sectional registry study included children with CP aged 6 to 18 years who participated in the Swedish national quality registry, the Cerebral Palsy Follow-up Program, CPUP, in 2015. Comparisons and associations between sex, country of birth, and functional aspects and physical leisure/physical education were examined using chi-squared and multivariable logistic regression analysis., Results: The study included 1935 children. Of them, 1625 (87%) reported participating in physical education and 989 (53%) reported participating in physical leisure activity. Children born in Sweden had higher odds of participating in physical education (OR: 1.99; 95% CI: 1.20-3.28) and physical leisure activity (OR: 2.51; 95% CI: 1.70-3.72) compared with children born outside Europe. Greater impairment of gross motor function was associated with lower participation levels. Boys participated slightly more frequently in leisure activities than girls., Conclusion: Enhancing social inclusion with regard to disability, birth country, and sex are important and achievable goals for policymakers and practitioners for promoting participation in physical activity for children and adolescents with CP., Competing Interests: The authors declare no conflicts of interest that could be perceived as prejudicing the impartiality of the research reported., (© 2021 The Authors. Health Science Reports published by Wiley Periodicals LLC.)
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- 2021
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14. Inequity in physiotherapeutic interventions for children with Cerebral Palsy in Sweden-A national registry study.
- Author
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Degerstedt F, Enberg B, Keisu BI, and Björklund M
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- Adolescent, Child, Child, Preschool, Cross-Sectional Studies, Humans, Infant, Infant, Newborn, Physical Therapy Modalities, Registries, Sweden epidemiology, Cerebral Palsy therapy
- Abstract
Aim: The aim of this study was to investigate the distribution of physiotherapeutic interventions for children with Cerebral Palsy in Sweden from an equity perspective, considering sex, country of birth and geographical region., Method: This national cross-sectional registry study includes children with Cerebral Palsy aged 0-18 years who participated in 2015 in the Swedish national quality registry, the Cerebral Palsy follow-up programme, CPUP. Comparisons and associations between physiotherapeutic interventions and sex, country of birth and geographical regions were conducted using chi-square and logistic regression analysis, controlling for cognitive level, level of motor function, age group and dominating symptom., Results: Of the 2855 participants, 2201 (79%) had received physiotherapy. Children born in Sweden had 1.60 times higher odds (95% CI 1.10-2.33) of receiving physiotherapy compared with children born in foreign countries. Distribution of physiotherapeutic interventions differed significantly between geographical regions. No associations between sex and physiotherapeutic interventions were observed., Conclusion: The results of this study indicate inequity in care in Sweden towards children with Cerebral Palsy born in other counties. Further, physiotherapeutic interventions were not equally distributed in different geographical regions of Sweden. Knowledge of inequity is crucial in order to address the problem., (© 2019 Foundation Acta Paediatrica. Published by John Wiley & Sons Ltd.)
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- 2020
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15. Choreographing life-experiences of balance control in people with Parkinson's disease.
- Author
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LaGrone S, Joseph C, Johansson H, Enberg B, and Franzén E
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- Aged, Aged, 80 and over, Female, Humans, Male, Middle Aged, Parkinson Disease psychology, Qualitative Research, Parkinson Disease physiopathology
- Abstract
Background: Parkinson's disease (PD) is a devastating neurodegenerative disorder. Reduced balance is one of the cardinal symptoms of PD, predisposing people living with PD to experience difficulties with the execution of tasks and activities, as well as hindering their involvement in meaningful life areas. The overarching aim of this study was to explore how deficits in balance control manifest in everyday life and how it is managed by people with PD (PwPD)., Methods: Qualitative description was used as methodology, and in-depth interviews were conducted with 18 participants, between the ages of 46 to 83 years, with mild to severe PD. Interview transcripts were analyzed using qualitative content analysis, following an inductive approach., Results: One theme emerged from the analysis: Increased planning-choreographing life. Within this overarching theme, two categories were identified, namely Limitations in mobility and New restricted functioning in everyday life, each with 3-4 sub-categories. The categories described how PwPD handled decreased balance control in their everyday life by using motor and cognitive strategies as a consequence of not trusting their body's capacity to control balance. Activities in everyday life, as well as the ability to partake in leisure and social activities were profoundly affected., Conclusion: People with mild to severe PD used strategies to handle decreased balance and they choreographed their lives around their individual current state of mobility and balance. The knowledge gained from this study can be used to develop targeted interventions addressing the nuances of balance deficits in everyday life.
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- 2020
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16. Employee effort - reward balance and first-level manager transformational leadership within elderly care.
- Author
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Keisu BI, Öhman A, and Enberg B
- Subjects
- Adult, Aged, Aged, 80 and over, Female, Humans, Male, Middle Aged, Surveys and Questionnaires, Sweden, Geriatric Nursing organization & administration, Hospital Administrators psychology, Job Satisfaction, Leadership, Nursing Staff, Hospital psychology
- Abstract
Background: Negative aspects, staff dissatisfaction and problems related to internal organisational factors of working in elderly care are well-known and documented. Much less is known about positive aspects of working in elderly care, and therefore, this study focuses on such positive factors in Swedish elderly care. We combined two theoretical models, the effort-reward imbalance model and the Transformational Leadership Style model. The aim was to estimate the potential associations between employee-perceived transformational leadership style of their managers, and employees' ratings of effort and reward within elderly care work., Methods: The article is based on questionnaires distributed at on-site visits to registered nurses, occupational therapists, physiotherapists (high-level education) and assistant nurses (low-level education) in nine Swedish elderly care facilities. In order to grasp the positive factors of work in elderly care, we focused on balance at work, rather than imbalance., Results: We found a significant association between employees' effort-reward balance at work and a transformational leadership style among managers. An association was also found between employees' level of education and their assessments of the first-level managers., Conclusions: We conclude that the first-level manager is an important actor for achieving a good workplace within elderly care, since she/he influences employees' psychosocial working environment. We also conclude that there are differences and inequalities, in terms of well-being, effort and reward at the work place, between those with academic training and those without, in that the former group to a higher degree evaluated their first-level manager to perform a transformational leadership style, which in turn is beneficial for their psychosocial work environment. Consequently, this (re)-produce inequalities in terms of well-being, effort and reward among the employees at the work place., (© 2017 Nordic College of Caring Science.)
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- 2018
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17. Team social cohesion, professionalism, and patient-centeredness: Gendered care work, with special reference to elderly care - a mixed methods study.
- Author
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Öhman A, Keisu BI, and Enberg B
- Subjects
- Adult, Aged, Female, Health Personnel, Humans, Interviews as Topic, Job Satisfaction, Male, Middle Aged, Patient Care Team, Qualitative Research, Salaries and Fringe Benefits, Sweden, Geriatric Nursing, Interprofessional Relations, Patient-Centered Care, Professionalism
- Abstract
Background: Healthcare organisations are facing large demands in recruiting employees with adequate competency to care for the increasing numbers of elderly. High degrees of turnover and dissatisfaction with working conditions are common. The gendered notion of care work as 'women's work', in combination with low salaries and status, may contribute to negative work experiences. There is abundant information about the negative aspects of elderly care health services, but little is known about positive aspects of this work. The study aim was to investigate work satisfaction from a gender perspective among Swedish registered nurses, physiotherapists, and occupational therapists, focusing specifically on healthcare services for the elderly., Methods: A mixed methods approach was adopted in which we combined statistics and open-ended responses from a national survey with qualitative research interviews with healthcare professionals in elderly care organisations. The survey was administered to a random sample of 1578 registered nurses, physiotherapists, and occupational therapists. Qualitative interviews with 17 professionals were conducted in six elderly care facilities. Qualitative and quantitative content analyses, chi
2 and constructivist grounded theory were used to analyse the data., Results: There was a statistically significant difference in overall work satisfaction between those who worked in elderly care and those who did not (64 and 74,4% respectively, p <0.001). Nine themes were derived from open-ended responses in the questionnaire. The qualitative interviews revealed four prominent storylines: 'Team social cohesion', 'Career development and autonomy', 'Client-centeredness', and 'Invisible and ignored power structures'., Conclusions: The results show the complexity of elderly care work and describe several aspects that are important for work satisfaction among health professionals. The results reveal that work satisfaction is dependent on social interrelations and cohesion in the work team, in possibilities to use humour and to have fun together, and in the ability to work as professionals to provide client-centered elderly care. Power relations such as gendered hierarchies were less visible or even ignored aspects of work satisfaction. The storylines are clearly linked to the two central discourses of professionalism and gender equality.- Published
- 2017
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18. Physiotherapeutic interventions and physical activity for children in Northern Sweden with cerebral palsy: a register study from equity and gender perspectives.
- Author
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Degerstedt F, Wiklund M, and Enberg B
- Subjects
- Adolescent, Child, Child, Preschool, Exercise, Female, Healthcare Disparities, Humans, Infant, Male, Motor Skills, Registries, Sexism, Sweden, Cerebral Palsy therapy, Exercise Therapy methods, Physical Therapy Modalities
- Abstract
Background: Young people with disabilities, especially physical disabilities, report worse health than others. This may be because of the disability, lower levels of physical activity, and discrimination. For children with cerebral palsy, access to physiotherapy and physical activity is a crucial prerequisite for good health and function. To date, there is limited knowledge regarding potential gender bias and inequity in habilitation services., Objectives: To map how physiotherapeutic interventions (PTI), physical leisure activity, and physical education are allocated for children with cerebral palsy regarding sex, age, level of gross motor function, and county council affiliation. This was done from a gender and equity perspective., Methods: A register study using data from the Cerebral Palsy follow-Up Program (CPUP). Data included 313 children ≤18 years with cerebral palsy from the five northern counties in Sweden during 2013. Motor impairment of the children was classified according to the expanded and revised Gross Motor Function Classification System (GMFCS)., Results: In three county councils, boys received more physiotherapy interventions and received them more frequently than girls did. Differences between county councils were seen for frequency and reasons for physiotherapy interventions (p < 0.001). The physiotherapist was involved more often with children who had lower motor function and with children who had low physical leisure activity. Children with lower motor function level participated in physical leisure activity less often than children with less motor impairment (p < 0.001). Boys participated more frequently in physical education than did girls (p = 0.028)., Conclusion: Gender and county council affiliation affect the distribution of physiotherapy interventions for children with cerebral palsy, and there are associations between gender and physical activity. Thus, the intervention is not always determined by the needs of the child or the degree of impairment. A gender-bias is indicated. Further studies are needed to ensure fair interventions.
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- 2016
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19. Cell transfection as a tool to study growth hormone action.
- Author
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Norstedt G, Enberg B, Francis S, Hansson A, Hulthén A, Lobie PE, Sliva D, Wood TJ, and Billestrup N
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- Animals, Gene Expression, Humans, Receptors, Somatotropin genetics, Signal Transduction, Growth Hormone physiology, Receptors, Somatotropin physiology, Transfection
- Abstract
The isolation of growth hormone receptor (GHR) cDNA clones has made possible the transfection of GHRs into cultured cells. Our aim in this minireview is to show how the application of such approaches have benefited GHR research. GH stimulation of cells expressing GHR cDNAs can cause an alteration of cellular function that mimic those of the endogenous GHR. GHR cDNA transfected cells also offer a system where the mechanism of GH action can be studied. Such a system has been used to demonstrate that the GHR itself becomes tyrosine phosphorylated and that further phosphorylation of downstream proteins is important in GH action. The GH signals are transmitted to the nucleus and GH regulated genes have now begun to be characterized. The ability to use cell transfection for mechanistic studies of GH action will be instrumental to define domains within the receptor that are of functional importance and to determine pathways whereby GH signals are conveyed within the cell.
- Published
- 1994
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20. Growth hormone (GH) regulation of a rat serine protease inhibitor fusion gene in cells transfected with GH receptor cDNA.
- Author
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Enberg B, Hulthén A, Möller C, Norstedt G, and Francis SM
- Subjects
- Animals, Base Sequence, CHO Cells, Cloning, Molecular, Cricetinae, Cricetulus, DNA, Complementary, Humans, Male, Molecular Sequence Data, Rats, Rats, Inbred BUF, Rats, Sprague-Dawley, Recombinant Fusion Proteins biosynthesis, Transfection, Tumor Cells, Cultured, Gene Expression Regulation physiology, Growth Hormone physiology, Receptors, Somatotropin genetics, Serine Proteinase Inhibitors genetics
- Abstract
The mechanism by which GH transmits a signal to the nucleus via its membrane-bound receptor is unknown. To study this process, Buffalo rat liver (BRL), rat hepatoma (FAO), human hepatoma (HepG2) and Chinese hamster ovary (CHO) cell lines were transfected with GH receptor cDNA, and stable clones expressing GH receptor mRNA and protein were selected. From previous in vivo studies it is known that GH regulates the expression of the rat hepatic serine protease inhibitor (SPI) 2.1 gene at the transcriptional level. However, in all the cell lines tested, SPI gene expression was less than 0.2% of that measured in rat liver, and GH did not affect the expression of the endogenous SPI gene in GH receptor-expressing cells. A 45 bp GH-responsive element (GHRE) has previously been defined in the SPI 2.1 gene. A construct containing six repeats of this GHRE was assembled with the thymidine kinase promoter and a chloramphenicol acetyl transferase (CAT) reporter gene. Transient transfection of this reporter gene resulted in GH stimulation of CAT activity in all GH receptor-transfected cell lines. A 33-fold induction was measured in the GH receptor-expressing BRL cells. Induction of CAT activity was observed after 8 h of GH treatment in the BRL-GHR638 cell line. Stable BRL cell lines expressing GH receptors with carboxy-terminal truncations (GHR380 and GHR454) did not show increased CAT activity on GH stimulation. This suggests that more than half of the intracellular domain of the GH receptor is required to activate transcription of the SPI 2.1 gene.(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1994
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21. Growth hormone receptor regulation in growth hormone-deficient dwarf rats.
- Author
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Carmignac DF, Robinson IC, Enberg B, and Norstedt G
- Subjects
- Animals, Female, Growth Hormone metabolism, Male, Radioimmunoassay, Rats, Rats, Mutant Strains, Growth Hormone deficiency, Pituitary Gland metabolism, Receptors, Somatotropin metabolism
- Abstract
In the rat, many actions of GH depend upon the sexually dimorphic pattern of exposure to GH. Hepatic human GH (hGH) receptor binding differs between the sexes and is sensitive to GH deficiency, but this has mostly been studied in acutely hypophysectomized rats, which lack all pituitary hormones. We have used a strain of GH-deficient dwarf (Dw) rats to determine whether chronic GH deficiency alters the normal developmental pattern and sexually dimorphic expression of hepatic GH receptors. Adult female Dw rats had lower levels of 125I-labelled hGH binding (reflecting predominantly lactogenic receptors) than their normal counterparts whereas there was no difference between adult Dw and normal males; binding capacity increased from 25 days of age, becoming sexually dimorphic from 40 days to adulthood in both strains (% specific binding/mg protein: normal males 1.6 +/- 0.3, normal females 13.2 +/- 1.1, Dw males 2.1 +/- 0.4, Dw females 10.0 +/- 0.6). In contrast, hepatic 125I-labelled bovine GH (bGH) binding (somatogenic receptors) was much lower, and similar in both Dw and normal animals. A sex difference in 125I-labelled bGH binding was only seen in adult animals, and was considerably less marked in Dw rats compared with normal animals (normal males 1.3 +/- 0.1, normal females 2.5 +/- 0.2, Dw males 1.9 +/- 0.2, Dw females 2.4 +/- 0.2%/mg protein). Continuous hGH infusion stimulated growth in female Dw rats, and raised somatogenic and lactogenic GH binding (3.2 +/- 0.4 and 19.6 +/- 2.5%/mg protein) compared with sham-infused controls (2.4 +/- 0.2 and 7.9 +/- 0.6%/mg protein).(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1993
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22. A novel in vitro model for studying signal transduction and gene regulation via the growth hormone receptor.
- Author
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Francis SM, Enerbäck S, Möller C, Enberg B, and Norstedt G
- Subjects
- Animals, Base Sequence, Cell Line, Cycloheximide pharmacology, Dactinomycin pharmacology, Enzyme Induction, Glyceraldehyde-3-Phosphate Dehydrogenases genetics, Lipoprotein Lipase genetics, Molecular Sequence Data, RNA, Messenger biosynthesis, Rats, Rats, Inbred BUF, Recombinant Fusion Proteins metabolism, Gene Expression Regulation drug effects, Glyceraldehyde-3-Phosphate Dehydrogenases biosynthesis, Growth Hormone pharmacology, Lipoprotein Lipase biosynthesis, Receptors, Somatotropin physiology, Signal Transduction
- Abstract
Buffalo rat liver cells were stably transfected with an expression vector containing rat GH (rGH) receptor cDNA. Transfected cells expressed rGH receptor mRNA and specifically bound GH with high affinity. When transfected cells were stimulated with GH, levels of lipoprotein lipase (LPL) mRNA were increased in a time- and dose-dependent fashion, while glyceraldehyde-3-phosphate-dehydrogenase mRNA levels were unaffected. No GH binding or LPL mRNA could be detected in untransfected cells. Treatment of transfected cells with actinomycin D inhibited the GH-stimulated increase in LPL mRNA, indicating that GH acts at a transcriptional level. When protein synthesis was inhibited using cycloheximide, basal levels of LPL mRNA were increased, and there was no GH stimulation. This suggests that LPL gene expression is constantly repressed by a labile protein. Chloramphenicol acetyltransferase constructs containing the human LPL promoter could be regulated by GH. In conclusion, stimulation of the rGH receptor in stably transfected Buffalo rat liver cells results in specific induction of LPL gene expression. This provides a novel model to study the mechanism of GH action, particularly in relation to gene regulation.
- Published
- 1993
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23. Growth hormone (GH) regulation of cytochrome P-450IIC12, insulin-like growth factor-I (IGF-I), and GH receptor messenger RNA expression in primary rat hepatocytes: a hormonal interplay with insulin, IGF-I, and thyroid hormone.
- Author
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Tollet P, Enberg B, and Mode A
- Subjects
- Animals, Cells, Cultured, Corticosterone pharmacology, Half-Life, Insulin pharmacology, Insulin-Like Growth Factor I pharmacology, Liver metabolism, Male, Nucleic Acid Hybridization, RNA Probes, Rats, Rats, Inbred Strains, Transcription, Genetic drug effects, Triiodothyronine pharmacology, Cytochrome P-450 Enzyme System genetics, Gene Expression drug effects, Growth Hormone pharmacology, Insulin-Like Growth Factor I genetics, RNA, Messenger genetics, Receptors, Somatotropin genetics
- Abstract
We have studied the GH-dependent expression of cytochrome P-450IIC12 (P-450(15)beta) mRNA and insulin-like growth factor-I (IGF-I) mRNA in primary adult rat hepatocytes. The GH receptor (GHR), being the common denominator for the GH response, was also studied. The respective mRNA levels were measured with specific solution hybridization assays. By investigating the effects of insulin, IGF-I, T3, and corticosterone, alone or in combinations, in the presence or absence of GH we concluded that GH is indeed the inducer of P-450(15)beta mRNA and IGF-I mRNA. However, insulin and IGF-I exerted a 2-fold potentiation of the GH-induced expression of the P-450(15)beta and IGF-I mRNA species. No significant effect of insulin was observed on GHR mRNA expression, but a translational or posttranslational effect on GHR was seen, in that insulin increased the binding of GH to the cells 4-fold. Furthermore, T3 caused a 9-fold increase in the GH-induced expression of IGF-I mRNA. These observations led us to postulate a possible mechanism of hormonal interplay between GH, thyroid hormone, and IGF-I in vivo, i.e. a thyroid hormone potentiation of the GH-induced IGF-I expression, which, in turn, leads to an increased GHR level and thereby a potentiation of the GH-induced expression of P-450(15)beta and, at least transiently, of IGF-I. A transcriptional mechanism of GH action on P-450(15)beta and IGF-I mRNA induction was indicated by the similar half-lives of respective mRNAs in the presence or absence of GH in cell cultures treated with actinomycin-D.(ABSTRACT TRUNCATED AT 250 WORDS)
- Published
- 1990
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24. Regulation of insulin-like growth factor-I and growth hormone receptor gene expression by diabetes and nutritional state in rat tissues.
- Author
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Bornfeldt KE, Arnqvist HJ, Enberg B, Mathews LS, and Norstedt G
- Subjects
- Animals, Fasting, Gene Expression Regulation, Insulin-Like Growth Factor I genetics, Liver metabolism, Rats, Receptors, Somatotropin genetics, Diabetes Mellitus, Experimental metabolism, Dietary Proteins administration & dosage, Insulin-Like Growth Factor I metabolism, RNA, Messenger metabolism, Receptors, Somatotropin metabolism, Somatomedins metabolism
- Abstract
Insulin-like growth factor-I (IGF-I) mRNA and GH receptor mRNA levels were analysed in different tissues from rats made diabetic with streptozotocin, fasted rats and rats fed with a protein-reduced diet. Diabetes decreased IGF-I mRNA levels in liver, heart, diaphragm, kidney and aorta, but not in brain. GH receptor mRNA levels were decreased in heart and diaphragm, but not in liver and kidney. Fasting decreased IGF-I mRNA in all tissues studied except brain, and decreased GH receptor mRNA in liver, heart and diaphragm, but not in kidney. A protein-reduced diet decreased hepatic IGF-I mRNA levels but did not significantly affect other tissues, while GH receptor mRNA levels were reduced in liver and diaphragm. In conclusion, both diabetes and limited nutrition affected IGF-I and GH receptor mRNA in different tissues, but the two mRNAs were not co-ordinately regulated in all tissues studied. While reduced GH receptor gene expression may thus be responsible for decreased IGF-I gene expression in some states and tissues, additional regulatory mechanisms may be of importance.
- Published
- 1989
- Full Text
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