Morphological variation in the interhemal areas of chorioallantoic placentae

Enders, Allen C.; Blankenship, Thomas N.; Lantz, Katherine C.; Enders, Sandy S.

doi:10.1016/s0143-4004(98)80030-1

Cited by 21 publications

(20 citation statements)

References 46 publications

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“…This unusual pattern of staining can possibly be attributed to the occurrence of cellular trophoblast rather than syncytiotrophoblast at the fetomaternal interface. It is uncommon to find a single layer of cytotrophoblast in a hemomonochorial barrier although there are other examples: the yellow-spotted hyrax, Heterohyrax brucei [Oduor-Okela et al, 1983] and some mollosid bats, where the central area of the placenta near term is a labyrinth of cellular trophoblast, although with intrasyncytial bays [Enders et al, 1998]. The jumping mouse ( Zapus spp.)…”

Section: Discussionmentioning

confidence: 99%

Glycosylation at the Fetomaternal Interface in Hemomonochorial Placentae from Five Widely Separated Species of Mammal: Is There Evidence for Convergent Evolution?

Jones

Carter

Aplin

et al. 2007

Cells Tissues Organs

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Hemomonochorial placentation occurs in diverse species. We have examined placental glycosylation in five widely separated mammals with this type of placentation – lesser hedgehog tenrec (Echinops telfairi), spotted hyena (Crocuta crocuta), nine-banded armadillo (Dasypus novemcinctus), human (Homo sapiens) and guinea pig (Cavia porcellus) – in order to assess whether evolutionary convergence to the hemomonochorial state is accompanied by a similar convergence of glycan expression. Placentae from 2 E. telfairi, 3 C. crocuta, 1 D. novemcinctus, 4 womenand 1 C. porcellus were fixed and processed into epoxy resin. Binding of twenty-three lectins was assessed using a semiquantitative ranking system. The trophoblast apical/microvillous membrane of all five species showed marked similarities in glycosylation. In the N-linked series, there were abundant bi/tri-antennary complex chains, while the non-bisected variants were much scarcer. All species had plentiful N-acetyl lactosamine sequences; at chain termini, binding to Galβ1,4GlcNAc and Galβ1,3GalNAc sequences was greatly enhanced after neuraminidase treatment. In all species, terminal NeuNAcα2,3 residues were detected. The tenrec had unusually abundant terminal N-acetyl galactosamine. The basal plasma membrane/basal lamina showed glycosylation patterns distinct from the microvillous membrane in each case, indicating chemical diversity of the two opposite faces of trophoblast. Similar classes of glycan at the hemochorial interface suggest conservation of function. The observed lectin binding patterns suggest broad similarities of glycosylation that may have arisen by convergent evolution.

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Section: Discussionmentioning

confidence: 99%

Glycosylation at the Fetomaternal Interface in Hemomonochorial Placentae from Five Widely Separated Species of Mammal: Is There Evidence for Convergent Evolution?

Jones

Carter

Aplin

et al. 2007

Cells Tissues Organs

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“…For example, haemochorial placentae are more permeable to lactate and exhibit less effective transfer of non-esterified fatty acids than epitheliochorial placentae (Kastendieck and Moll 1977;Wooding and Burton 2008). While much is known about how interhemal distance is physiologically increased or decreased (see Enders et al 1998;Abd-Elnaeim et al 1999;Mess et al 2003;Enders and Carter 2004), the evolutionary process remains elusive, despite transformations along every major eutherian clade. It is debated whether the plesiomorphic eutherian condition is endotheliochorial (Luckett 1976(Luckett , 1993Mossman 1991;Haig 1993;Pijnenborg and Vercruysse 2004;Enders and Carter 2006; or haemochorial (Lillegraven et al 1987;Vogel 2005;Crespi 2008, 2009).…”

Section: Interhemal Barriermentioning

confidence: 99%

Life-History Correlates of Placental Structure in Eutherian Evolution

Lewitus

Soligo

2011

Evol Biol

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The eutherian placenta shows remarkable evolutionary plasticity. To date, however, success in identifying selection pressures behind the observed diversity of placental structures has been limited. Evolutionary convergence among definitive placental morphologies and between placental morphologies and life-history variables can be used to suggest functions of derived aspects of placentation. In this paper, we use, for the first time, a comprehensive phylogenetic comparative approach to map phenotypic character states of both placental morphologies and life-history characteristics of species onto hypotheses of phylogenetic relationships in Eutheria. We employ phylogenetic methods for ancestral reconstruction, mutational mapping, and association analysis to resolve associations between five aspects of placental structure and to identify dominant combinations, or syndromes, of placental morphology. We map twenty life-history characters onto the eutherian phylogeny to examine how they correlate, over evolutionary time, with the multivariate diversification of placental structures. We identify two distinct eutherian constellations, based on associations between life-history and placental structure, which broadly reflect a dichotomy between slow and fast life-history strategies. In addition, we suggest that the observed association between placental invasiveness and group size is indicative of the effect of social behavior on the utility of genomicimprinting in eutherian evolution.

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“…Trophoblast is less invasive in the endotheliochorial placenta in Carnivores (Enders and Schlafke, 1972;Enders et al, 1998;Leiser and Enders, 1980;Leiser and Koob, Fig. 2.…”

Section: Trophoblasts In Carnivoresmentioning

confidence: 94%

Cell reproduction and genome multiplication in the proliferative and invasive trophoblast cell populations of mammalian placenta

Zybina

2005

Cell Biology International

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Spatiotemporal "time-table" of ways of cell reproduction (mitosis, restitutional mitosis, endomitosis, endoreduplication) of trophoblast cell populations is described. The populations of mitotically active trophoblast cells (diploid and low-polyploid) are located mostly out of contact with maternal tissues. In rodent placenta they mainly switch from mitotic cycle to polyploidizing (restitutional) mitoses and reach 4c-8c. Thereafter they switch to endoreduplication and reach 16c-64c. Following a series of endoreduplication cycles a part of this cell population sets apart and penetrates deeply into the decidualized endometrium and myometrium, their capabilities for replication being lost progressively (in rodent--256c-1024c). The invasive trophoblast cells that reach 256c-1024c via endoreduplication simultaneously form a barrier between semiallogenic fetal and maternal tissues. Arrest of mitoses and complete repression of DNA replication after a series of endoreduplication cycles makes hardly probable the renewal of mitotic activity in the deeply invading tertiary giant trophoblast cells, thereby preventing the possibility of their ectopic expanding in the maternal tissues during the normal pregnancy.

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Morphological variation in the interhemal areas of chorioallantoic placentae

Cited by 21 publications

References 46 publications

Glycosylation at the Fetomaternal Interface in Hemomonochorial Placentae from Five Widely Separated Species of Mammal: Is There Evidence for Convergent Evolution?

Glycosylation at the Fetomaternal Interface in Hemomonochorial Placentae from Five Widely Separated Species of Mammal: Is There Evidence for Convergent Evolution?

Life-History Correlates of Placental Structure in Eutherian Evolution

Cell reproduction and genome multiplication in the proliferative and invasive trophoblast cell populations of mammalian placenta

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