Functional complexity in the chorioallantoic membrane of an oviparous snake: Specializations for calcium uptake from the eggshell.
Autor: | Ecay TW; Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, Johnson, Tennessee, USA., Stewart JR; Department of Biological Sciences, East Tennessee State University, Johnson City, Tennessee, USA., Khambaty M; Department of Biomedical Sciences, Quillen College of Medicine, East Tennessee State University, Johnson, Tennessee, USA. |
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Jazyk: | angličtina |
Zdroj: | Journal of experimental zoology. Part B, Molecular and developmental evolution [J Exp Zool B Mol Dev Evol] 2022 Sep; Vol. 338 (6), pp. 331-341. Date of Electronic Publication: 2022 Jun 02. |
DOI: | 10.1002/jez.b.23146 |
Abstrakt: | The chorioallantoic membrane of oviparous reptiles forms a vascular interface with the eggshell. The eggshell contains calcium, primarily as calcium carbonate. Extraction and mobilization of this calcium by the chorioallantoic membrane contributes importantly to embryonic nutrition. Development of the chorioallantoic membrane is primarily known from studies of squamates and birds. Although there are pronounced differences in eggshell structure, squamate and bird embryos each mobilize calcium from eggshells. Specialized cells in the chicken chorionic epithelium transport calcium from the eggshell aided by a second population of cells that secrete protons generated by the enzyme carbonic anhydrase. Calcium transporting cells also are present in the chorioallantoic membrane of corn snakes, although these cells function differently than those of chickens. We used histology and immunohistology to characterize the morphology and functional attributes of the chorioallantoic membrane of corn snakes. We identified two populations of cells in the outer layer of the chorionic epithelium. Calbindin-D (© 2022 Wiley Periodicals LLC.) |
Databáze: | MEDLINE |
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