Ovum transport in mammalian oviducts involves two main effectors: ciliary motility and muscle contractility. To study the relative contribution of cilia to ovum transport in the rat, we blocked smooth muscle activity with isoproterenol, a beta-adrenergic agonist, and measured transport rates of surrogate ova in situ. Transport rates before isoproterenol administration were 0.04 mm/s in the cephalic ampulla and 0.03 mm/s in the caudal ampulla; rates were unchanged after administration of isoproterenol. To determine if isoproterenol affected ciliary activity, we measured ciliary beat frequency with laser-scattering spectroscopy over the effective isoproterenol dosage. Isoproterenol did not cause a significant change in ciliary beat frequency. Our results show that in the rat oviductal ampulla, ciliary motion is capable of transporting ova in the absence of muscle contractility.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1095/biolreprod40.6.1131 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Lipophorin receptor knockdown reduces hatchability of kissing bug Rhodnius prolixus eggs.
Insect Biochem Mol Biol
January 2025
Programa de Pós-Graduação em Biociências, Universidade do Estado do Rio de Janeiro, Brazil; Instituto Nacional de Ciência e Tecnologia em Entomologia Molecular, Brazil; Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Brazil. Electronic address:
Lipophorin is the primary lipoprotein present in the hemolymph of insects, responsible for the lipids' transport between organs. It interacts with specific sites on cell membranes in an essential process for transferring lipids. The lipophorin receptor is the protein responsible for the interaction between lipophorin and cell membranes.
View Article and Find Full Text PDFDNA barcode reference library of the fish larvae and eggs of the South China Sea: taxonomic effectiveness and geographic structure.
BMC Ecol Evol
October 2024
College of Fisheries, Guangdong Ocean University, Zhanjiang, 524088, China.
Fish early-stages constitute useful indicators of the states of marine ecosystems, as well as important fishery resources. Given the spectacular phenotypic changes during ontogeny, and the paucity of diagnostic morphological characters at the species level, the identification of fish early-stages is a challenging task. DNA barcoding, the use of the mitochondrial gene of the cytochrome c oxidase subunit I (COI) as an internal species tag, opened new perspectives for the identifications of both larval fish and fish eggs.
View Article and Find Full Text PDFRat copper transport protein 2 (CTR2) is involved in fertilization through interaction with IZUMO1 and JUNO.
Theriogenology
January 2025
Inner Mongolia Key Laboratory for Molecular Regulation of the Cell, School of Life Sciences, Inner Mongolia University, Hohhot, PR China. Electronic address:
In mammalian reproduction, testis-specific protein IZUMO1 and its receptor JUNO on the oocyte surface are essential for sperm-oocyte recognition, binding, and membrane fusion. However, these factors alone are insufficient to accomplish cytoplasmic membrane fusion. It is believed that other gametic proteins interact with them to facilitate sperm-oocyte interaction on the head and mid-tail of rat spermatozoa as well as on the surface of oocytes.
View Article and Find Full Text PDFPassive dispersal potential of medaka eggs by attaching to waterbirds.
Naturwissenschaften
October 2024
Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Ibaraki, 305-8572, Japan.
Colonization of new habitats is a key event in forming current distributions in organisms. It has been speculated that freshwater fish eggs can be dispersed passively by attaching to or egestion from waterbirds that arrive in wetland habitats. Recent research showed that some freshwater fish eggs could be excreted alive from birds and then successfully hatch, but scientific evidence of bird-mediated fish dispersal is still limited to endozoochory (internal transport through a bird's digestive tract).
View Article and Find Full Text PDFImpact of in ovo administration of xylo- and mannooligosaccharides on broiler chicken gut health.
Poult Sci
December 2024
Department of Animal Biotechnology and Genetics, Faculty of Animal Breeding and Biology, Bydgoszcz University of Science and Technology, Mazowiecka 28, 85-084 Bydgoszcz, Poland.
Article Synopsis
- The study investigated how injecting prebiotics (XOS and MOS) into chicken embryos affects their gut microbiota and gene expression.
- Results showed an increase in beneficial bacteria like Lactobacillus spp. and Bifidobacterium spp., especially in the cecum, compared to a control group.
- Gene expression analysis indicated that the prebiotics also influenced the expression of several immune response and nutrient transport genes in the intestine.
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!