Metabolomic Profile of Allantoic and Amniotic Fluid in Late-term Gestational Mares Characterized by 1H-nuclear Magnetic Resonance Spectroscopy.

The research article describes a study that examines the metabolomic profile of equine allantoic and amniotic fluid during late gestation, using a technique known as nuclear magnetic resonance spectroscopy. The results reveal significant differences in the metabolic compounds found in the two types of fluids.

Introduction

• The study focuses on the amniotic and allantoic fluid compartments in mares during late-term gestation. These fluids are vital during pregnancy and parturition (the process of giving birth).
• Despite extensive characterization of the metabolomic profile of amniotic fluid in humans, there is limited data available for equine fetal fluids, which is the gap this research aims to address.

Methods

• Fetal fluids were collected from 12 pregnancies between 270 and 295 days of gestation using ultrasound-guided transabdominal puncture. A total of 24 samples were analyzed, including 10 allantoic fluid samples, nine amniotic fluid samples, and five admixed fluid samples.
• The metabolic profile of these samples was characterized using one-dimensional proton (1H) and two-dimensional (1H-C) nuclear magnetic resonance spectroscopy, which is a powerful tool for identifying and quantifying metabolites.
• The metabolites found in different fluid types were compared using a Kruskal-Wallis test, with a significance set at P < .05.

Results

• The analysis identified 28 distinct metabolites in the allantoic and admixed fluid, while 23 metabolites were identified in the amniotic fluid.
• The metabolites betaine, creatine, creatinine, citrate, histidine, nitrophenol, tryptophan, π-methylhistidine, and an unidentified metabolite were significantly higher (P < .05) in the allantoic fluid compared to the amniotic fluid.
• On the other hand, the metabolite lactate showed statistically increased concentrations in the amniotic fluid compared to the allantoic fluid (P = .003).

Significance of the Study

• The study is important as it provides a comprehensive understanding of the metabolomic profile of equine allantoic and amniotic fluid during late-term gestation.
• The identified metabolites and their difference in concentration between the two fluid types could be significant indicators of fetal health and development, underlining the relevance of this research for equine reproductive health and veterinary medicine.