Hepatic Lipid Accumulation and Dysregulation Associate with Enhanced Reactive Oxygen Species and Pro-Inflammatory Cytokine in Low-Birth-Weight Goats

Simple Summary In livestock, a low birth weight (LBW) has a broad impact on neonatal survival, growth performance, and metabolic health in adult life. The liver plays an important role to regulate lipid metabolism, but the development of hepatic dyslipidemia associated with LBW is still unknown in goats. Herein, we evaluated lipid and metabolic status of LBW livers in contrast to those of newborns with normal birth weight. RNA sequencing was used to screen potential dysregulated functional genes involved in hepatosteatosis. Results showed lower antioxidant capacity, enhanced pro-inflammatory cytokine, and increased hepatic lipid accumulation in LBW goats associated with impaired regulatory machineries. Understanding the knowledge of intrinsic mechanism underlying hepatic dyslipidemia in LBW goats could provide important implications for promoting efficiency of production and health in their later life. Occurrence of low birth weight (LBW) is a major concern in livestock production, resulting in poor postnatal growth, lowered efficiency of feed utilization, and impaired metabolic health in adult life. In the southwest region of China, birth weight of indigenous strains of goats varies seasonally with lower weights in summer and winter, but the metabolic regulation of the LBW offspring is still unknown. In this study, by comparing LBW goats to normal birth weight group, we examined hepatic lipid content in association with regulatory mechanisms. Histological studies showed higher microvesicular morphology in the liver of LBW goats in accompany with a significantly higher level of hepatic free fatty acids, total triglycerides, and cholesterols. Lipid metabolism impairment, increased oxidative stress, and inflammation were observed by transcriptome analysis. Meanwhile, Kyoto Encyclopedia of Genes and Genomes (KEGG) annotation further demonstrated lipid peroxidation, antioxidant pathway, and pro-inflammatory response involved in the hepatic lipid dysregulation from LBW group. Therefore, dysregulations of hepatic lipid metabolism, including fatty acid biosynthesis and degradation, lipid transportation, and oxidative stress, played important roles to contribute the lipid accumulation in LBW goats. Moreover, due to impaired antioxidant capacity, the oxidative damage could interact with persisting pro-inflammatory responses, leading to a higher risk of liver injury and metabolic syndromes in their adult life.

Automated summary

Low birth weight has a broad impact on neonatal survival, growth performance, and metabolic health in livestock. In this study, we evaluated the lipid and metabolic status of low birth weight goat livers and found impairments in antioxidant capacity, increased pro-inflammatory cytokines, and enhanced hepatic lipid accumulation. Understanding the intrinsic mechanisms underlying hepatic dyslipidemia in low birth weight goats is important for promoting efficiency of production and health in their later life.