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Maternal-embryonic relationships in the goodeid teleost, Xenoophorus captivus

The vacuolar apparatus in trophotaenial absorptive cells and its role in macromolecular transport

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Summary

The endodermal trophotaenial epithelium in goodeid embryos acts as a placental exchange site. Fine structural and cytochemical data indicate that the trophotaenial absorptive cells are endocytotically highly active. To test their micropinocytotic capacity and characterize the cellular mechanisms involved in membrane, solute and ligand movements, living embryos of Xenoophorus captivus were incubated in saline media containing horseradish peroxidase (HRP) and/or cationized ferritin (CF) in vitro, and the uptake of these tracer proteins examined by both time sequence analysis and pulse-chase procedures. In some embryos, the effects of prolonged exposure to CF injected into the ovarian cavity, was also investigated.

Labelling of the free cell surface was detectable with CF only, but interiorization of both probes was quick from all incubation media. Adsorptive pinocytosis of CF and fluid-phase uptake of HRP sequentially labelled pinocytic vesicles, endosomes, and lysosome-like bodies. In addition, CF-molecules were sequestered within apical tubules and small vesicles. HRP was largely excluded from both organelles and ended up in the lysosomal compartment. For CF, two alternative pathways were indicated by the pulse-chase experiments; transcellular passage and regurgitation of tracer molecules to the apical cell surface. The latter procedure involves membrane and receptor recycling, in which apical tubules are thought to mediate.

In double-tracer experiments, using an 8∶1 excess of HRP, external labelling with CF was light or lacking after 1–3 min, and the initial uptake-phase produced pinocytic vesicles and endosomes that mainly contained HRP-reaction product. Prolonged incubation, however, resulted in densely CF-labelled plasmalemmal invaginations and pinocytic vesicles that predominantly carried ferritin granules. After 60 min, the vacuoles of the endosomal compartment contained either high concentrations of HRP-reaction product, both tracers side by side, or virtually exclusively CF.

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Schindler, J.F., de Vries, U. Maternal-embryonic relationships in the goodeid teleost, Xenoophorus captivus . Cell Tissue Res. 253, 115–128 (1988). https://doi.org/10.1007/BF00221746

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