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Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
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Functional immunocytochemistry of Tragulus placenta: implications for ruminant evolution.

F B P Wooding1, J Kimura2, A J Forhead1

  • 1Department of Physiology Development and Neuroscience, Cambridge University, Downing Street, Cambridge CB2 3EG, UK.

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Summary

Tragulus, a primitive ruminant, shares key placental transporters with other ruminants, suggesting evolutionary pressures for larger placental area drove cotyledonary development. Unique GT1 expression aids glucose supply.

Keywords:
Comparative placentationImmunocytochemistryRuminant evolution

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Area of Science:

  • Comparative placental morphology
  • Ruminant evolution
  • Mammalian reproduction

Background:

  • Tragulus (mouse deer) possesses a diffuse placenta, unlike the cotyledonary placenta of other ruminants.
  • Understanding placental evolution is key to deciphering reproductive strategies in mammals.

Purpose of the Study:

  • To investigate placental transporters in Tragulus using immunocytochemistry.
  • To elucidate evolutionary mechanisms leading to the cotyledonary placenta.

Main Methods:

  • Immunocytochemical investigation of placental transporters in Tragulus.
  • Analysis of trophoblast binucleate cell (BNC) dynamics and specific transporter expression (e.g., GT1, GT3, Aquaporin 3, 9 kD Calcium Binding Protein).

Main Results:

  • Tragulus exhibits BNC dynamics, dual glucose transporters (GT1, GT3), Aquaporin 3 for water transport, and uterine gland secretions similar to other ruminants.
  • Unlike other ruminants, Tragulus expresses 9 kD Calcium Binding Protein throughout the villus, not restricted to intercotyledonary areas.
  • Strong expression of Glucose Transporter 1 (GT1) in BNC granules is unique to Tragulus.

Conclusions:

  • Tragulus utilizes similar transport systems and BNC dynamics as other ruminants.
  • Increased fetal size and the need for greater glucose supply likely drove the evolution of cotyledonary placentas.
  • Tragulus's unique maternal-facing GT1 delivery may be a specific adaptation for maintaining fetal glucose supply.