Ruminant models of prenatal growth restriction

Area of Science:

• Reproductive biology
• Developmental biology
• Perinatal medicine

Background:

• Intrauterine growth restriction (IUGR) is a major concern affecting infant mortality and long-term health, potentially leading to adult cardiovascular and metabolic diseases.
• Human IUGR often involves asymmetric fetal growth due to placental insufficiency and altered nutrient transfer, resulting in fetal hypoxia, hypoglycemia, and acidosis.
• Understanding IUGR mechanisms requires robust animal models, as clinical studies alone have limitations.

Purpose of the Study:

• To review and compare various ovine models used to induce fetal growth restriction.
• To evaluate the suitability of these sheep models in mimicking the characteristics of human IUGR.
• To provide insights into the mechanisms underlying IUGR development.

Main Methods:

• Review of existing literature on ovine models of IUGR.
• Comparison of induced fetal growth restriction in sheep with clinical findings in human IUGR.
• Analysis of methods used to induce IUGR in sheep, including maternal nutrient manipulation, hormonal administration, and surgical interventions.

Main Results:

• Several ovine models can induce fetal growth restriction, including maternal nutrient restriction/excess, glucocorticoid administration, utero-placental embolization, carunclectomy, and hyperthermia.
• The degree of fetal growth restriction varies across different ovine models.
• These models exhibit characteristics relevant to human IUGR, such as altered placental function and fetal metabolic disturbances.

Conclusions:

• Ovine models offer valuable tools for studying the pathophysiology of IUGR.
• Comparative analysis highlights the strengths and limitations of different sheep models for IUGR research.
• Further research using these models can elucidate IUGR mechanisms and inform therapeutic strategies.