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Published on: July 11, 2025
Lack of protracted behavioral abnormalities following intermittent or continuous chronic mild hypoxia in perinatal
Juan M Lima-Ojeda1, Miriam A Vogt1, S Helene Richter1
1RG Animal Models in Psychiatry, Department of Psychiatry and Psychotherapy, Central Institute of Mental Health, Medical Faculty Mannheim, University of Heidelberg, Heidelberg, Germany.
Insights
Perinatal hypoxia, or oxygen deprivation around birth, did not cause long-term behavioral changes in mice. This suggests other factors are needed to link hypoxia to psychiatric disorders.
Area of Science:
- Neuroscience
- Developmental Biology
- Psychiatry
Background:
- Perinatal hypoxia is a suspected risk factor for psychiatric disorders, including schizophrenia.
- Hypoxia may cause alterations leading to adult psychiatric conditions, but its sufficiency is unknown.
- Transient cortical damage from hypoxia is observed, but long-term behavioral effects remain unclear.
Purpose of the Study:
- To investigate if chronic mild perinatal hypoxia induces long-term behavioral alterations in mice.
- To determine if hypoxia alone is sufficient to trigger lasting behavioral changes.
Main Methods:
- C57BL/6 mice were exposed to intermittent or continuous chronic mild hypoxia (10% O2) from postnatal days 3-7.
- Mice were analyzed during young adulthood using standard behavioral tests.
Main Results:
- Neither intermittent nor continuous perinatal hypoxia resulted in long-term behavioral alterations in adult mice.
- Transient cortical damage observed in previous studies did not correlate with lasting behavioral deficits.
Conclusions:
- Perinatal hypoxia, under the tested conditions, does not appear to be sufficient to cause long-term behavioral abnormalities.
- The regenerative capacity of the perinatal brain or the specific mouse strain's resistance may explain the lack of effects.
- Additional factors, such as genetic predisposition or more severe hypoxic events (anoxia), may be required for hypoxia to contribute to psychiatric disorders.
Abstract:
Several prospective studies indicated perinatal hypoxia as risk factor for psychiatric disorders like schizophrenia. It is thought that hypoxia prior to or during birth may contribute to alterations leading to the protracted clinical manifestation during young adulthood. However, only a small fraction of children with a history of perinatal hypoxia develop later psychotic symptoms, therefore it is not known if hypoxia alone is sufficient to trigger long-term behavioral changes. Here we exposed C57BL/6 mice from postnatal day 3-7 (P3-P7) to two established paradigms of chronic mild hypoxia (10% ambient O2), intermittent and continuous. Subsequently, mice were analysed during young adult stages using several basic behavioral tests. Previous studies demonstrated severe, but only transient, cortical damage in these paradigms; it is not clear, if these reversible morphological changes are accompanied by long-term behavioral effects. We found that neither intermittent nor continuous perinatal hypoxia induced long-term behavioral alterations. This may be due to the high regenerative capacity of the perinatal brain. Other possibilities include a potential resistance to perinatal hypoxia of the mouse strain used here or a level of hypoxia that was insufficient to trigger significant behavioral changes. Therefore, our data do not exclude a role of perinatal hypoxia as risk factor for psychiatric disorders. They rather suggest that either other, more severe hypoxic conditions like anoxia, or the presence of additional factors (as genetic risk factors) are necessary for generating long-term behavioral abnormalities.
