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The effect of prenatal hypoxia on brain development: short- and long-term consequences demonstrated in rodent models
1Department of Developmental Molecular Genetics and Zlotowski Center for Neuroscience, Faculty of Health Sciences, Ben-Gurion University of the Negev, Beer-Sheva, Israel. havag@bgu.ac.il
Insights
Prenatal hypoxia and hypoxia-ischemia cause fetal brain damage, leading to delayed development and lasting behavioral impairments in rodents. Understanding these effects is key to developing interventions.
Area of Science:
- Neuroscience
- Developmental Biology
- Perinatal Medicine
Background:
- Prenatal hypoxia and hypoxia-ischemia are significant contributors to fetal brain injury.
- These conditions have profound and long-lasting behavioral consequences.
- Rodent models are crucial for studying the effects of these insults.
Purpose of the Study:
- To review recent studies on behavioral outcomes following prenatal hypoxia/hypoxia-ischemia in rodent models.
- To elucidate the timeline and mechanisms of cell death and brain damage.
- To inform the development of therapeutic strategies.
Main Methods:
- Review of existing literature on rodent models of prenatal hypoxia/hypoxia-ischemia.
- Analysis of studies reporting behavioral assessments (sensory, motor, learning, memory).
- Examination of data on the temporal profile of apoptotic cell death and tissue damage.
Main Results:
- Delayed sensory and motor reflex development observed in the first postnatal month.
- Impaired motor function, learning, and memory in adult animals.
- Early activation of cell death signaling (3 hours post-insult), increased apoptosis (peaking ~10 days post-insult), and apparent cell loss (14-20 days post-insult).
Conclusions:
- Prenatal hypoxia/hypoxia-ischemia leads to significant neurodevelopmental and behavioral deficits in rodents.
- The molecular mechanisms underlying cell death and brain damage are becoming clearer.
- This knowledge is foundational for developing effective treatments for fetal brain injury.
Abstract:
Hypoxia (H) and hypoxia-ischemia (HI) are major causes of foetal brain damage with long-lasting behavioral implications. The effect of hypoxia has been widely studied in human and a variety of animal models. In the present review, we summarize the latest studies testing the behavioral outcomes following prenatal hypoxia/hypoxia-ischemia in rodent models. Delayed development of sensory and motor reflexes during the first postnatal month of rodent life was observed by various groups. Impairment of motor function, learning and memory was evident in the adult animals. Activation of the signaling leading to cell death was detected as early as three hours following H/HI. An increase in the counts of apoptotic cells appeared approximately three days after the insult and peaked about seven days later. Around 14-20 days following the H/HI, the amount of cell death observed in the tissue returned to its basal levels and cell loss was apparent in the brain tissue. The study of the molecular mechanism leading to brain damage in animal models following prenatal hypoxia adds valuable insight to our knowledge of the central events that account for the morphological and functional outcomes. This understanding provides the starting point for the development and improvement of efficient treatment and intervention strategies.
