1,592 publications from this institution
The present paper provides a review of 45 studies on the Effort–Reward Imbalance (ERI) Model published from 1986 to 2003 (inclusive). In 1986, the ERI Model was introduced by Siegrist et al. (Biological and Psychological Factors in Cardiovascular Disease, Springer, Berlin, 1986, pp. 104–126; Social Science & Medicine 22 (1986) 247). The central tenet of the ERI Model is that an imbalance between (high) efforts and (low) rewards leads to (sustained) strain reactions. Besides efforts and rewards, overcommitment (i.e., a personality characteristic) is a crucial aspect of the model. Essentially, the ERI Model contains three main assumptions, which could be labeled as (1) the extrinsic ERI hypothesis: high efforts in combination with low rewards increase the risk of poor health, (2) the intrinsic overcommitment hypothesis: a high level of overcommitment may increase the risk of poor health, and (3) the interaction hypothesis: employees reporting an extrinsic ERI and a high level of overcommitment have an even higher risk of poor health. The review showed that the extrinsic ERI hypothesis has gained considerable empirical support. Results for overcommitment remain inconsistent and the moderating effect of overcommitment on the relation between ERI and employee health has been scarcely examined. Based on these review results suggestions for future research are proposed.
No abstract is provided for this article.
No abstract is provided for this article.
Occupational Health Psychology: past, present and future Occupational Health Psychology: past, present and future Wilmar Schaufeli, Gedrag & Organisatie, Volume 17, October 2004, nr. 5, pp. 327-341 Occupational Health Psychology (OHP) concerns studying and improving employees' health and well-being. Although some psychologists pioneered the field a long time ago, OHP emerged relatively recent in the 1990s. The Netherlands have played an important role in its development, since OHP found a fertile soil in the country's legal, political, social, psychological, and institutional climate. In view of both external (i.e. societal) and internal (i.e. scientific) developments the future of OHP research is described. In particular, some important results and future challenges of five different types of research are discussed: explanatory, descriptive, tool development, intervention and organizational change research, respectively. The article concludes with the observation that the current 'negative' approach of OHP that focuses on unhealthiness, unwell-being and malfunctioning is evolving towards a more 'positive' approach that focuses on health, well-being and optimal functioning.
No abstract is provided for this article.
Abstract The intestinal epithelium is the most rapidly self-renewing tissue in adult mammals. We originally defined Lgr5 as a Wnt target gene, transcribed in colon cancer cells. Two knock-in alleles revealed exclusive expression of Lgr5 in cycling, columnar cells at the crypt base. Using lineage tracing experiments in adult mice, we found that these Lgr5+ve crypt base columnar cells (CBC) generated all epithelial lineages throughout life, implying that they represent the stem cell of the small intestine and colon. Lgr5 was subsequently found to represent an exquisitely specific and almost ‘generic’ marker for stem cells, including in hair follicles, kidney, liver, mammary gland, inner ear tongue and stomach epithelium. Single sorted Lgr5+ve stem cells can initiate ever-expanding crypt-villus organoids, or so called ‘mini-guts’ in 3D culture. The technology is based on the observation that Lgr5 is the receptor for a potent stem cell growth factor, R-spondin. Similar 3D cultures systems have been developed for the Lgr5+ve stem cells of human stomach, liver, pancreas, prostate and kidney. Using CRISPR/Cas9 technology, genes can be efficiently modified in organoids of various origins. Citation Format: Hans Clevers. Lgr5 stem cell-based organoids in human disease. [abstract]. In: Proceedings of the AACR Special Conference: Developmental Biology and Cancer; Nov 30-Dec 3, 2015; Boston, MA. Philadelphia (PA): AACR; Mol Cancer Res 2016;14(4_Suppl):Abstract nr IA12.
The intestinal epithelium is the fastest renewing tissue in mammals and has a large flexibility to adapt to different types of damage. Lgr5+ crypt base columnar (CBC) cells act as stem cells during homeostasis and are essential during regeneration. Upon perturbation, the activity of CBCs is dynamically regulated to maintain homeostasis and multiple dedicated progenitor cell populations can reverse to the stem cell state upon damage, adding another layer of compensatory mechanisms to facilitate regeneration. Here, we review our current understanding of how intestinal stem and progenitor cells contribute to homeostasis and regeneration, and the different signaling pathways that regulate their behavior. Nutritional state and inflammation have been recently identified as upstream regulators of stem cell activity in the mammalian intestine, and we explore how these systemic signals can influence homeostasis and regeneration.
Ethics of organoid research Growing functional human tissues and organs would provide much needed material for regeneration and repair. New technologies are taking us in that direction. In addition to their use in regenerative medicine, stem cells that grow and morph into organ-like structures known as organoids can be used in drug development and toxicology testing. The potential developments and possibilities are numerous and affect not only biomedicine but also areas of ongoing ethical debate, such as animal experimentation, research on human embryos and fetuses, ethics review, and patient consent. Bredenoord et al. review how organoids affect existing ethical debates and how they raise novel ethical dilemmas and professional responsibilities. Science , this issue p. 10.1126/science.aaf9414
