During early embryogenesis, endodermal γ1-laminin expression is required for basement membrane (BM) assembly, promoting conversion of non-polar pluripotent cells into polarized epiblast. The influence of laminin-111 (Lm111) and its integrin and dystroglycan (DG) receptors on epiblast in embryoid bodies (EBs), a model for differentiation of the embryonic plate, was further investigated. Lm111 added to the medium of EBs initiated conversion of inner nonpolar cell to the polarized epiblast epithelium with an exterior-to-central basal-to-apical orientation. Microinjection of Lm111 into EB interiors resulted in an interior BM with complete inversion of cell polarity. Lm111 assembled a BM on integrin-β1 null EBs with induction of polarization at reduced efficiency. β-Integrin compensation was not detected in these nulls with integrin adaptor proteins failing to assemble. A dimer of laminin LG domains 4-5 (LZE3) engineered to strongly bind to α-dystroglycan almost completely inhibited laminin accumulation on integrin β1-null EBs, reducing BM and ablating cell polarization. When Lm111 was incubated with integrin-β1/dystroglycan double-knockout EBs, laminin failed to accumulate on the EBs, the EBs did not differentiate, and the EBs underwent apoptosis. Collectively the findings support the hypotheses that the locus of laminin cell surface assembly can determine the axis of epithelial polarity. This requires integrin- and/or dystroglycan-dependent binding to laminin LG domains with the highest efficiency achieved when both receptors are present. Finally, EBs that cannot assemble a matrix undergo apoptosis.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5250580 | PMC |
http://dx.doi.org/10.1016/j.matbio.2016.07.005 | DOI Listing |
Stem Cell Res Ther
December 2024
Laser Research Centre, Faculty of Health Sciences, University of Johannesburg, P.O. Box 17011, Doornfontein, 2028, South Africa.
Background: Embryoid bodies (EBs) are three-dimensional (3D) multicellular cell aggregates that are derived from stem cell and play a pivotal role in regenerative medicine. They recapitulate many crucial aspects of the early stages of embryonic development and is the first step in the generation of various types of stem cells, including neuronal stem cells. Current methodologies for differentiating stem cells into neural embryoid bodies (NEBs) in vitro have advanced significantly, but they still have limitations which necessitate improvement.
View Article and Find Full Text PDFWorld J Surg Oncol
December 2024
Department of General Surgery, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China.
Background: Preoperative biliary drainage (PBD) for selected patients with severe juandice has been shown to improve clinical conditions for pancreaticoduodenectomy (PD) and reduce the risk of post-pancreatectomy hemorrhage (PPH). However, the determination of an optimal end-point for PBD remains unclear. The aim of this research is to introduce the concept of goal-oriented biliary drainage, which may serve as a reasonable target and identify the optimal surgery time window.
View Article and Find Full Text PDFBMC Oral Health
December 2024
Department of Cranio-Maxillofacial Surgery, University Hospital Münster, Münster, Germany.
Background: Inherited epidermolysis bullosa (EB) is a genetic disorder characterized by skin fragility and unique oral features. This prospective study aimed to analyze the correlation between oral health-related quality of life (OHRQoL) and the objectively measured oral health indices of people suffering from EB and within their subtypes.
Methods: The German version of the Oral Health Impact Profile (OHIP-14G) was employed for the assessment of OHRQoL.
BMC Public Health
December 2024
WHO Health Emergencies Programme, WHO Country Office in Yemen, Sana'a, Yemen.
Background: The international health emergency caused by the emergence of the SARS-CoV-2 virus demonstrated the expanding usefulness of multi-country disease outbreak information gathered through event-based surveillance (EBS) as an extension beyond the main purposes of early warning, alert, and response (EWAR). In this article, previous events of multi-country outbreaks from 2010-2019 were reviewed for how EBS, within an expanded sphere of Epidemic Intelligence (EI), may help to enhance the understanding of outbreaks for a more timely and nuanced, multiple-point trigger approach to health emergencies.
Methods: The public, open-source database of ProMed reports were reviewed for the date of first notification on major outbreaks of infectious diseases and then compared for subsequent dates of any new, exceptional epidemiological findings (novel host, settings, transmission characteristics) as a determining factor for prolonged, multi-country events later acknowledged on the WHO disease outbreak news (DON) website, or by peer-reviewed journal publication if no related DON information became available.
Nutrients
December 2024
Postgraduate Program in Clinical and Experimental Physiopathology, Faculty of Medical Sciences, State University of Rio de Janeiro, Rio de Janeiro 20550-013, RJ, Brazil.
Background/objective: Weight regain has serious health consequences after bariatric surgery, and disordered eating behaviors (EBs) may be involved in it. We compared disordered EB symptoms in post-bariatric patients according to low vs. high ratio of weight regain (RWR) and investigated associations between disordered EB symptoms with weight regain and time since surgery.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!