The mesenchymal tissues involved in cardiac septation are derived from different sources. In addition to endocardial-derived mesenchyme, the heart also receives contributions from the neural crest, the proepicardium, and the dorsal mesenchymal protrusion (DMP). Whereas the contributions of the neural crest and proepicardium have been thoroughly studied, the DMP has received little attention. Here, we present the results of a comprehensive spatiotemporal study of the DMP in cardiac development. Using the Tie2-Cre mouse, immunohistochemistry, and AMIRA reconstructions, we show that the DMP, in combination with the mesenchymal cap on the primary atrial septum, fuse with the major atrioventricular cushions to close the primary atrial foramen and to form the atrioventricular mesenchymal complex. In this complex, the DMP constitutes a discrete prominent mesenchymal component, wedged in between the major cushions. This new model for atrioventricular septation may provide novel insights into understanding the etiology of congenital cardiac malformations.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4003411 | PMC |
| http://dx.doi.org/10.1002/dvdy.21074 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Spinal cord elongation enables proportional regulation of the zebrafish posterior body.
Development
January 2025
Department of Genetics, University of Cambridge, Cambridge, CB2 3EH, UK.
Early embryos display a remarkable ability to regulate tissue patterning in response to changes in tissue size. However, it is not clear whether this ability continues into post-gastrulation stages. Here, we performed targeted removal of dorsal progenitors in the zebrafish tailbud using multiphoton ablation.
View Article and Find Full Text PDFPreliminary study on the preparation of lyophilized acellular nerve scaffold complexes from rabbit sciatic nerves with human umbilical cord mesenchymal stem cells.
World J Stem Cells
December 2024
Department of Orthopedics, Children's Hospital of Fudan University & National Children's Medical Center, Shanghai 201102, China.
Background: The gold standard of care for patients with severe peripheral nerve injury is autologous nerve grafting; however, autologous nerve grafts are usually limited for patients because of the limited number of autologous nerve sources and the loss of neurosensory sensation in the donor area, whereas allogeneic or xenografts are even more limited by immune rejection. Tissue-engineered peripheral nerve scaffolds, with the morphology and structure of natural nerves and complex biological signals, hold the most promise as ideal peripheral nerve "replacements".
Aim: To prepare allogenic peripheral nerve scaffolds using a low-toxicity decellularization method, and use human umbilical cord mesenchymal stem cells (hUC-MSCs) as seed cells to cultivate scaffold-cell complexes for the repair of injured peripheral nerves.
Exosomes derived from human placental mesenchymal stem cells in combination with hyperbaric oxygen therapy enhance neuroregeneration in a rat model of sciatic nerve crush injury.
Regen Ther
March 2025
Cellular and Molecular Research Center, Mazandaran University of Medical Sciences, Sari, Iran.
Peripheral nerve damage continues to be a significant challenge in the field of medicine, with no currently available effective treatment. Currently, we investigated the beneficial effects of human placenta mesenchymal stem cells (PMSCs)- derived exosomes along with hyperbaric oxygen therapy (HBOT) in a sciatic nerve injury model. Seventy-five male mature Sprague-Dawley rats were allocated into five equal groups.
View Article and Find Full Text PDFMorphogen gradients convey essential spatial information during tissue patterning. While both concentration and timing of morphogen exposure are crucial, how cells interpret these graded inputs remains challenging to address. We employed an optogenetic system to acutely and reversibly modulate the nuclear concentration of the morphogen Dorsal (DL), homologue of NF-κB, which orchestrates dorso-ventral patterning in the embryo.
View Article and Find Full Text PDFTissue mechanics modulate morphogen signalling to induce the head organiser.
Cells Dev
December 2024
Department of Cell and Developmental Biology, University College London, Gower Street, London WC1E 6BT, UK; Center for Integrative Biology, Faculty of Sciences, Universidad Mayor, Santiago, Chile. Electronic address:
Morphogenetic movements and specification of germ layers during gastrulation are key processes that establish the vertebrate body plan. Despite substantial research into the role of tissue mechanics during gastrulation and detailed characterisation of the molecular signalling networks controlling fate determination, the interplay of mechanical cues and biochemical signals during fate specification is poorly understood. Morphogens that activate Activin/Nodal/Smad2 signalling play a key role in mesoderm induction and axial patterning.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!