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Long-term postnatal effect of prenatal irradiation on the astrocyte proliferative response to brain injury
K Janeczko1, R Pawliński, Z Setkowicz
1Department of Neuroanatomy, Jagiellonian University, Kraków, Poland. jane@zuk.iz.uj.edu.pl
Insights
Prenatal gamma-irradiation, even at low doses, can enhance astrocyte proliferation in adult offspring. This study shows a lasting increase in the brain
Area of Science:
- Neuroscience
- Developmental Biology
- Radiation Biology
Background:
- Astrocytes are crucial glial cells in the central nervous system.
- Prenatal exposure to environmental factors can have long-term effects on brain development and function.
- The impact of low-dose prenatal irradiation on astrocyte reactivity in later life is not well understood.
Purpose of the Study:
- To investigate the long-term effects of prenatal gamma-irradiation on astrocyte proliferation in response to brain injury.
- To determine if prenatal irradiation influences the reactivity of astrocytes in adult offspring.
Main Methods:
- Pregnant Wistar rats were exposed to a single 1.0 Gy dose of gamma-irradiation on specific gestational days.
- Offspring received a mechanical lesion to the cerebral hemisphere at 30 days of age.
- Proliferation of astrocytes was assessed using [3H]thymidine incorporation and immunostaining for GFAP and S100 beta protein.
Main Results:
- A statistically significant elevation in reactive astrocyte proliferation was observed on day 2 post-injury in offspring irradiated on gestational day 15.
- This indicates a long-term increase in the proliferative capacity of astroglia following prenatal irradiation.
- The findings provide the first in vivo evidence of such an effect.
Conclusions:
- Low-dose prenatal gamma-irradiation can induce a lasting enhancement in astrocyte proliferation in response to brain injury.
- Gestational day 15 appears to be a sensitive period for this effect.
- These findings have implications for understanding the long-term neurological consequences of prenatal radiation exposure.
Abstract:
Pregnant Wistar rats were exposed to a single 1.0 Gy dose of gamma-irradiation on gestational day 13, 15, 17 or 19. Thirty-day-old male offspring received a mechanical lesion in the left cerebral hemisphere. One, 2 or 4 days after the injury the rats were injected with [3H]thymidine and sacrificed 4 h after the injection. Thereafter, brain sections were immunostained for GFAP or S100 beta protein, subjected to autoradiography and examined microscopically to record immunopositive astrocytes labelled with [3H]thymidine. Statistically significant elevation of the reactive astrocyte proliferation was revealed on the 2nd day following injury in brains irradiated on gestational day 15. The results represent the first in vivo evidence that a low-dose prenatal gamma-irradiation can induce a long-term increase in the ability of astroglia to proliferate in response to injury.