Amino Acids

, Volume 45, Issue 3, pp 479–488

Dietary l-glutamine supplementation improves pregnancy outcome in mice infected with type-2 porcine circovirus

  • Wenkai Ren
  • Wei Luo
  • Miaomiao Wu
  • Gang Liu
  • Xinglong Yu
  • Jun Fang
  • Teijun Li
  • Yulong Yin
  • Guoyao Wu
Original Article

DOI: 10.1007/s00726-011-1134-5

Cite this article as:
Ren, W., Luo, W., Wu, M. et al. Amino Acids (2013) 45: 479. doi:10.1007/s00726-011-1134-5

Abstract

Porcine circovirus type 2 (PCV2) causes reproductive failure in swine. As glutamine can enhance immune function in animals, this study was conducted with mice to test the hypothesis that dietary glutamine supplementation will improve pregnancy outcome in PCV2-infected dams. Beginning on day 0 of gestation, mice were fed a standard diet supplemented with 1.0% l-glutamine or 1.22% l-alanine (isonitrogenous control). All mice were infected with PCV2 (2000 TCID50) on day 10 of gestation. On day 17 of gestation, six mice from each group were euthanized to obtain maternal tissues and fetuses for hematology and histopathology tests. The remaining mice continued to receive their respective diets supplemented with 1.0% l-glutamine or 1.22% l-alanine through lactation. The PCV2 virus was present in maternal samples (serum and lung) of most mice in the control group but was not detected in the glutamine-supplemented mice. Dietary glutamine supplementation reduced abortion, decreased fetal deaths, and enhanced neonatal survival. The glutamine treatment also reduced concentrations of interleukin-6, while increasing concentrations of tumor necrosis factor-α and C-reactive protein, in the maternal serum of mice. Furthermore, glutamine supplementation attenuated microscopic lesions in maternal tissues (lung, spleen, and liver). Collectively, these results indicate that dietary glutamine supplementation is beneficial for ameliorating reproductive failure in virus-infected mice. The findings support the notion that gestating dams require adequate amounts of dietary glutamine for the optimal survival and growth of embryos, fetuses, and neonates, and have important implications for nutritional support of mammals (including swine and humans) during gestation and lactation.

Keywords

Porcine circovirus type 2PigsNutritionAmino acidsReproductive failure

Abbreviations

CRP

C-Reactive protein

IL-1β

Interleukin-1β

IL-6

Interleukin-6

PCV2

Porcine circovirus type 2

qPCR

Quantitative polymerase chain reaction

TNF-α

Tumor necrosis factor-α

Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Wenkai Ren
    • 1
    • 3
  • Wei Luo
    • 2
  • Miaomiao Wu
    • 1
  • Gang Liu
    • 1
  • Xinglong Yu
    • 2
  • Jun Fang
    • 3
  • Teijun Li
    • 1
  • Yulong Yin
    • 1
  • Guoyao Wu
    • 1
    • 4
    • 5
  1. 1.Research Center for Healthy Breeding of Livestock and Poultry, Key Laboratory for Agro-ecological Processes in Subtropical RegionHunan Engineering and Research Center of Animal and Poultry Science, Institute of Subtropical Agriculture, The Chinese Academy of SciencesChangshaChina
  2. 2.College of Veterinary MedicineHunan Agricultural UniversityChangshaChina
  3. 3.College of Bioscience and BiotechnologyHunan Agricultural UniversityChangshaChina
  4. 4.State Key Laboratory of Animal NutritionChina Agricultural UniversityBeijingChina
  5. 5.Department of Animal ScienceTexas A & M UniversityCollege StationUSA