Obesity in mares promotes uterine inflammation and alters embryo lipid fingerprints and homeostasis.

The study highlights how obesity in mare (female horses) can lead to uterine inflammation and changes in the lipid profiles of embryos, potentially affecting prenatal development and resulting in long-term health effects.

Understanding the Maternal Obesity Effect

• The research has been carried out to understand the impact and implications of maternal obesity, independent of a high-fat diet, on the uterine and pre-implantation embryos in horses.
• The study collected embryos from both normal and obese mares at different stages of embryonic development (8 and 16 days) and performed uterine biopsies on the 16th day.
• This was done to assess any influence of the mare’s obesity status on the embryo’s development and the uterine environment.

Gene Expression and Lipid Analysis

• Researchers divided the samples into two. One set of samples was used to analyze gene expression related to metabolic functions such as lipid homeostasis, carbohydrate metabolism, inflammation, oxidative stress, mitochondrial stress, endoplasmic reticulum stress, and components of the insulin-like growth factor (IGF) system.
• This analysis was done to identify any changes or alterations in gene expression that may occur due to the mare’s obesity.
• The second set of samples was analyzed for lipid content, using a technique called matrix-assisted laser desorption/ionization mass spectrometry.

Impact of Obesity on Embryos and Uterine Environment

• The study found that obese mares had higher concentrations of insulin, leptin, and total cholesterol with a trend of increased triglycerides levels and decreased insulin sensitivity.
• Embryos from obese mares showed altered gene expression activity, particularly involving those related to inflammation, lipid homeostasis, and various forms of cellular stress.
• The lipid fingerprints of embryos from obese mares were different, indicating a potential alteration in their metabolic functions due to the mare’s obesity.
• Similarly, the uterine environment in obese mares showed increased levels of inflammatory cytokines and altered regulation of lipid homeostasis.
• Overall, the study found that the mare’s obesity status can alter the uterine environment and the embryos’ genetic and molecular profile, which could potentially impact prenatal programming and long-term health of the offspring.