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Prenatal morphine exposure induces molecular and structural alterations in the developing hippocampus of neonatal
Pooya Nadri1, Zahra Daneshfar2, Zahra Azarmehr3
1Student Research Committee, Ramsar Campus, Mazandaran University of Medical Sciences, Ramsar, Iran.
Insights
Prenatal morphine exposure alters key neurodevelopmental genes and damages the hippocampus in rat pups. This suggests potential long-term neurocognitive risks, highlighting the need to limit opioid use during pregnancy.
Area of Science:
- Neuroscience
- Developmental Biology
- Pharmacology
Background:
- Opioid use during pregnancy poses risks to fetal neurodevelopment.
- The hippocampus, crucial for cognition, is particularly vulnerable.
- Molecular and histological effects of prenatal opioid exposure are not fully understood.
Purpose of the Study:
- To investigate the impact of short-term prenatal morphine exposure on neurodevelopmental gene expression.
- To assess structural changes in the hippocampus of neonatal rats following prenatal morphine exposure.
Main Methods:
- Pregnant rats received morphine sulfate on gestational days 15-16.
- Quantitative real-time PCR analyzed neurodevelopmental genes (MDH2, Neurog1, BDNF).
- Histological and immunohistochemical staining evaluated hippocampal cellular architecture, glial integrity, and synaptic density.
Main Results:
- Morphine exposure upregulated MDH2, Neurog1, and BDNF expression.
- Histological analysis revealed neuronal degeneration and inflammation in the hippocampus.
- Reduced GFAP, S100, and synaptophysin indicated glial loss and synaptic disruption.
Conclusions:
- Prenatal morphine exposure causes significant molecular and histopathological alterations in the developing hippocampus.
- These changes suggest potential long-term neurocognitive dysfunction.
- Findings underscore the importance of restricting opioid use in pregnancy and exploring therapeutic targets.
Objectives:
Prenatal exposure to opioids such as morphine poses significant risks to fetal neurodevelopment, particularly in brain regions critical for cognition, such as the hippocampus. Despite the prescription and use of opioids during pregnancy, the molecular and histological consequences of such exposure remain insufficiently explored. To evaluate the effects of short-term prenatal morphine exposure on the expression of key neurodevelopmental genes and the structural integrity of the hippocampus in neonatal rats.
Materials And Methods:
Pregnant Sprague Dawley rats were administered intraperitoneal injections of morphine sulfate (10 mg/kg) on gestational days 15 and 16. On postnatal day 12, offspring (n = 6 per group) were euthanized, and their hippocampal tissues were collected. Quantitative real-time PCR was performed to assess the expression levels of neurodevelopmental genes, including MDH2, Neurog1, and BDNF. Histological evaluations were conducted using hematoxylin and eosin and cresyl violet staining to assess cellular architecture and neuronal viability. Immunohistochemical staining for GFAP, S100, and synaptophysin was used to evaluate astrocytic integrity and synaptic density.
Results:
The morphine-exposed group showed significant up-reglation of MDH2, Neurog1, and BDNF (P<0.05). Histological analyses revealed neuronal degeneration and inflammatory infiltration in the hippocampus. Immunohistochemistry demonstrated a marked reduction of GFAP, S100, and synaptophysin signals, indicating substantial glial loss and synaptic disruption.
Conclusion:
Prenatal morphine exposure leads to marked molecular and histopathological changes in the developing hippocampus, suggesting long-term risks for neurocognitive dysfunction. These findings emphasize the importance of limiting opioid use during pregnancy and identifying molecular targets for future therapeutic interventions.
