Although the administration of adrenocortical hormones to pregnant rats provokes only limited effect on the growth and development of the fetus, the direct influence of these steroids on cultured embryos has never been studied. The disruption of cell signaling by ZK 91587, which specifically occupies the mineralocorticoid receptor, resulted within 2 days in significant and pronounced adverse effects on the total length, the somite number, the embryo curvature, the communication between vitelline and umbilical blood vessels in the allantoid, and the vascularization of the vitelline sac, in 244-hour Wistar rat embryos in culture. The average score of 16 organs declined in a dose-dependent manner, following exposure to ZK 91587, and this was totally reversed by 10 microM aldosterone which, by itself, did not at all influence the embryonic development. The organogenesis was inhibited in the order: hind limb > fore limb > optic stalk > brain > olfactory pit > otic vesicle. ZK 91587 was completely ineffective in embryos that had attained the age of 260 hours. Similar, but less dramatic, results were obtained with the mineralocorticoid antagonist RU 26752, and with the antiglucocorticoid RU 38486. Sprague-Dawley rat embryos responded in a manner similar to the Wistar conceptuses. Thus, steroid receptor-mediated cell signaling is of critical importance to the growth and development of cultured rat embryos, which form a new model system to unravel adrenocortical hormone action.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1080/10915810290096324 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Toll-like receptor 4 inhibition by pyridostigmine is associated with a reduction in hypertension and inflammation in rat models of preeclampsia.
J Hypertens
February 2025
Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, People's Republic of China.
Background: Preeclampsia (PE) is marked by hypertension and detrimental sterile inflammatory response. Despite the reported anti-inflammatory effect of pyridostigmine bromide (PYR) in different models, its anti-inflammatory mechanism in PE is unclear. This study assessed whether such an anti-inflammatory effect involves inhibition of placental Toll-like receptor 4 (TLR4) signaling.
View Article and Find Full Text PDFExosomes derived from hUC-MSCs exhibit ameliorative efficacy upon previous cesarean scar defect via orchestrating β-TrCP/CHK1 axis.
Sci Rep
January 2025
Science and Technology Innovation Center, Shandong Provincial Key Medical and Health Laboratory of Blood Ecology and Biointelligence, Jinan Key Laboratory of Medical Cell Bioengineering, Cardio- cerebrovascular Disease Hospital of Jinan, The Fourth People's Hospital of Jinan, The Teaching Hospital of Shandong Second Medical University, 50 Shifan Road, Tianqiao District, Jinan, 250031, Shandong, China.
Previous cesarean scar defect (PCSD), also acknowledged as the myometrium of uterus defects, which commonly results in myometrial discontinuity between the uterine and cervical cavity. Current literatures have indicated the efficacy of MSCs and MSC-derived exosomes (MSC-Exos) for diverse refractory disease administration, yet the feasibility of MSC-Exos for PCSD treatment is largely obscure. In this study, we took advantage of the in vivo myofibrotic model for mimicking the typical manifestation of PCSD and the assessment of fertility.
View Article and Find Full Text PDFPrenatal toxicity of L-mimosine in Wistar rats.
Toxicon
December 2024
Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, S.P., Brazil; Institute of Environmental, Chemical and Pharmaceutical Sciences, Federal University of São Paulo (ICAQF-UNIFESP), Diadema, S.P., Brazil. Electronic address:
L-Mimosine is the main active component of the plant Leucaena leucocephala. Due to its metal-chelating mechanism, it interacts with various metabolic pathways in living organisms, making it a potential pharmacological target, although it also leads to toxicity. The present study aimed to investigate the transplacental passage of L-mimosine and its effects on embryofetal development.
View Article and Find Full Text PDFThe effects of secretome of umbilical cord mesenchymal stem cells on regeneration of sciatic nerve defects in Sprague dawley rats.
PLoS One
December 2024
Faculty of Medicine Universitas Indonesia, Department of Orthopaedics & Traumatology, Dr Cipto Mangunkusumo National Central Hospital, Jakarta, Indonesia.
Background And Purpose: Current treatments for peripheral nerve defects are suboptimal. Mesenchymal stem cell (MSC) implantation holds promise, with studies indicating their efficacy through the secretome. This study aims to assess the secretome's potency in regenerating peripheral nerve defects.
View Article and Find Full Text PDFPeony-shaped zinc oxide nanoflower synthesized via hydrothermal route exhibits promising anticancer and anti-amyloid activity.
BMC Pharmacol Toxicol
December 2024
Medical Bionanotechnology, Faculty of Allied Health Sciences, Chettinad Hospital and Research Institute, Chettinad Academy of Research and Education, Chettinad Health City, Kelambakkam, Tamilnadu, 603103, India.
Background: Cancer is the deadliest disease, and neurological disorders are also marked as slow progressive diseases, ultimately leading to death. Stopping two mouths with one morsel was the strategy that we used in this study.
Methods: We have synthesized peony-shaped zinc oxide nanoflowers (ZnO-NFs) and characterized them using various photophysical tools like UV-vis spectroscopy, zeta potential analysis, dynamic light scattering (DLS), FTIR, and scanning electron microscopy (SEM), and utilized these nanoflowers to monitor their anticancer and anti-amyloid activity.
Want 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!