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Age-associated aberrations of the cumulus-oocyte interaction and in the zona pellucida structure reduce fertility in female mice.
Commun Biol
December 2024
The Institute of Medical Science, The University of Tokyo, Minato-ku, Tokyo, 1088639, Japan.
One of the major age-related declines in female reproductive function is the reduced quantity and quality of oocytes. Here we demonstrate that structural changes in the zona pellucida (ZP) were associated with decreased fertilization rates from 34- to 38-week-old female mice, equivalent to the mid-reproductive of human females. In middle-aged mouse ovaries, the decline in the number of transzonal projections was accompanied by a decrease in cumulus cell-oocyte interactions, resulting in a deterioration of the oocyte quality.
View Article and Find Full Text PDFSmall extracellular vesicles derived from umbilical cord mesenchymal stem cells alleviate radiation-induced cardiac organoid injury.
Stem Cell Res Ther
December 2024
Beijing Institute of Radiation Medicine, Beijing, 100850, China.
Background: Radiation-induced heart disease (RIHD) is one of the most serious complications of radiation therapy (RT) for thoracic tumors, and new interventions are needed for its prevention and treatment. Small extracellular vesicles (sEVs) from stem cells have attracted much attention due to their ability to repair injury. However, the role of umbilical cord mesenchymal stem cell (UCMSC)-derived sEVs in protecting cardiac organoids from radiation-induced injury and the underlying mechanisms are largely unknown.
View Article and Find Full Text PDFPlacental extracellular vesicles from women with severe preeclampsia alter calcium homeostasis in cardiomyocytes: an ex vivo study.
Am J Physiol Cell Physiol
January 2025
Division of Molecular and Translational Biomedicine, Department of Anesthesiology and Perioperative Medicine, School of Medicine, University of Alabama at Birmingham, Birmingham, Alabama, United States.
Women with severe preeclampsia (sPE) exhibit a heightened risk of postpartum cardiovascular disease compared with those with normotensive pregnancies (NTP). Although placental extracellular vesicles (EVs) play a crucial role in feto-maternal communication, their impact on cardiomyocytes, particularly in the context of sPE, remains unclear. This study investigated the effect of sPE-associated placental EVs (sPE-Plex EVs) on cardiomyocyte calcium dynamics.
View Article and Find Full Text PDFArticle Synopsis
- - The study uses scanning electron microscopy to investigate the egg structures of six species from two subgenera of East Palaearctic insects in the Russian Far East, revealing variations in adhesive layer thickness and micropyle type based on species.
- - Eggs from the subgenus Ephemera possess a notably thick adhesive layer, while those from Sinephemera have thinner, more amorphous layers, with distinct micropyle characteristics observed across species.
- - Chorion structures vary significantly among species, showing different textures like smooth, reticulate, and wrinkled, which proves essential for identifying and classifying the eggs and their corresponding species.
Exochorionic morphology in four genera of Coeini: Pycina, Historis, Smyrna, and Tigridia (Nymphalidae: Nymphalinae).
Zootaxa
September 2024
Museo de Zoología (Entomología); Departamento de Biología Evolutiva; Facultad de Ciencias; Universidad Nacional Autónoma de México; México; 04510; CDMX; México; Posgrado en Filosofía de la Ciencia; Universidad Nacional Autónoma de México; México.
We describe and compare the exochorion of four species currently recognized as belonging to the nymphalid tribe Coeini: Pycina zamba zelis, Historis a. acheronta, Smyrna karwinskii, and Tigridia acesta latifascia, based on specimens collected in the field and rehydrated specimens from entomological collections. We use a staining technique and scanning electron microscopy to observe and describe the main exochorionic characters as ridges, prebasal modifications, and microstructure.
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