Isolation and identification of steroids from gonadal vein blood of the fetal horse.

This research explores the techniques of extracting and identifying steroids in the blood of fetal horses derived from a direct connection of a fetal ovary artery to the carotid artery of the mare. The principal steroid discovered was dehydroepiandrosterone (DHA).

Procedure and Methodology

• The research team started by creating a direct connection between the artery of a fetal ovary and the carotid artery of a mare. This allowed the scientists to access and collect a large volume of blood over a 30-minute period.
• They then extracted steroids from the collected blood and conducted their fractionation. This process separates the steroids into their distinct components for further analysis.

Chromatography and Steroid Identification

• After fractionation, the researchers used a series of chromatography techniques to further separate and identify the steroids. These techniques included alumina adsorption chromatography, Sephadex LH-20 chromatography, and Celite partition chromatography.
• They used high performance liquid chromatography (HPLC) to further resolve the material. HPLC is a technique used in biochemistry to identify the amounts and types of chemicals in a mixture.

DHA Identification

• The researchers identified dehydroepiandrosterone (DHA), a steroid hormone, through nuclear magnetic resonance and mass spectrometry. These are techniques that allow the chemical make-up and weight of the steroid to be determined.
• Additional compounds were isolated through the procedure, requiring further identification. However, the main finding was that, during the eighth month of pregnancy, DHA was the principal steroid secreted by the fetal ovary.

Implications

• This research provides valuable insights into the steroid production of fetal horses, particularly regarding the secretion of DHA. These findings could have implications for understanding reproductive processes, hormonal regulation, or developing potential therapies or interventions if hormonal imbalances were identified in fetal horses.