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Developmental changes in polyamine levels and synthesis in the ovine conceptus.
Hyukjung Kwon1, Guoyao Wu, Fuller W Bazer
1Department of Animal Science and Center for Animal Biotechnology and Genomics, Texas A and M University, College Station, Texas 77843-2471, USA.
Biology of Reproduction
|July 12, 2003
Summary
Polyamine synthesis in sheep placenta peaks early in pregnancy, crucial for conceptus development. This study reveals key metabolic shifts supporting early placental growth.
Area of Science:
- Reproductive Biology
- Developmental Physiology
- Biochemistry
Background:
- Polyamines (putrescine, spermidine, spermine) are vital for placental growth and angiogenesis.
- Limited knowledge exists on polyamine synthesis changes during ovine conceptus development.
Purpose of the Study:
- To investigate polyamine synthesis rates in ovine placental tissues throughout gestation.
- To test the hypothesis that polyamine synthesis is maximal during early pregnancy.
Main Methods:
- Hysterectomy of ewes at various gestational stages (Days 30-140).
- Analysis of placentomes, placental tissues, and fluids for enzyme activities and metabolite concentrations.
- Radiochemical and chromatographic methods used to measure polyamine synthesis rates.
Main Results:
- Maximal ornithine decarboxylase (ODC) and arginase activities observed on Day 40 of gestation.
- Peak polyamine synthesis rates and concentrations in placental tissues occurred on Day 40.
- Polyamines were most abundant in allantoic fluid (Days 40-60) and amniotic fluid (Days 100-140).
Conclusions:
- Metabolic coordination supports high polyamine synthesis in early ovine pregnancy.
- Findings have implications for understanding intrauterine growth retardation and fetal programming of adult diseases.