دورية أكاديمية
Freeze-fracture observations on the visceral yolk sac placenta of rats, mice and hamsters. With special reference to endodermal cell tight junctions.
العنوان: | Freeze-fracture observations on the visceral yolk sac placenta of rats, mice and hamsters. With special reference to endodermal cell tight junctions. |
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المؤلفون: | Carpenter SJ, Dishaw MT |
المصدر: | Anatomy and embryology [Anat Embryol (Berl)] 1979; Vol. 157 (3), pp. 255-68. |
نوع المنشور: | Journal Article; Research Support, U.S. Gov't, P.H.S. |
اللغة: | English |
بيانات الدورية: | Publisher: Springer-Verlag Country of Publication: Germany NLM ID: 7505194 Publication Model: Print Cited Medium: Print ISSN: 0340-2061 (Print) Linking ISSN: 03402061 NLM ISO Abbreviation: Anat Embryol (Berl) Subsets: MEDLINE |
أسماء مطبوعة: | Original Publication: Berlin, New York, Springer-Verlag |
مواضيع طبية MeSH: | Placenta/*ultrastructure , Rodentia/*anatomy & histology , Yolk Sac/*ultrastructure, Animals ; Cricetinae ; Endoderm/ultrastructure ; Female ; Freeze Fracturing ; Intercellular Junctions/ultrastructure ; Mice ; Microscopy, Electron, Scanning ; Pregnancy ; Rats |
مستخلص: | Freeze-fracture replicas of visceral yolk sac from rats, mice and hamsters in late stages of gestation were studied by electron microscopy. Special attention was directed toward determining the types of junctional specializations that exist between the columnar endoderm cells of this placental membrane. In all three species, well-developed, zonular tight (occluding) junctions were found on the contiguous lateral surfaces of the endoderm cells. The tight junctional network, located in an immediate subluminal position, was from 0.2--0.5 micrometers in depth and consisted at any point of 2--5, interconnecting, approximately 9 eta wide, strands (P-face) or shallow furrows (E-face). Patch-like aggregations of irregular intramembrane particles, characteristic of desmosomes (maculae adherentes), also were observed at scattered sites below the tight junctions. However, no evidence of gap (communicating) junctions was encountered. The endoderm cells of the rodent visceral yolk sac have been shown to play a central role in the selective transport of macromolecular substances from the maternal to the fetal system. Tight junctions may be vital to this endodermal cell function by preventing random paracellular fluxes of macromolecules. |
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تواريخ الأحداث: | Date Created: 19790101 Date Completed: 19800317 Latest Revision: 20190902 |
رمز التحديث: | 20240627 |
DOI: | 10.1007/BF00304993 |
PMID: | 525818 |
قاعدة البيانات: | MEDLINE |
تدمد: | 0340-2061 |
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DOI: | 10.1007/BF00304993 |