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Neuropathological Examination of Mice Chronically Exposed to Secondhand Smoke
Leilani A Lopes1, Conor Davenport1, Estefania Ramos Torres1
1Department of Basic Medical Sciences, Western University of Health Sciences, College of Osteopathic Medicine of the Pacific-Northwest, Lebanon, OR 97355, USA.
Military Medicine
|November 10, 2023
Summary
Second-hand smoke (SHS) exposure in mice increased oxidative DNA damage and inflammation in the brain. These changes in DNA repair proteins suggest a mechanism for SHS-induced cognitive decline in military personnel.
Area of Science:
- Neuroscience
- Toxicology
- Molecular Biology
Background:
- Second-hand smoke (SHS) is prevalent in military personnel, posing neurological disease risks.
- SHS induces oxidative stress, DNA damage, and disrupts DNA repair pathways.
Purpose of the Study:
- To investigate the effects of SHS on oxidative DNA damage, DNA repair, and neuroinflammation in a mouse model.
- To understand the molecular mechanisms underlying SHS-induced cognitive dysfunction.
Main Methods:
- Mice were exposed to SHS, and their brains were analyzed for markers of oxidative DNA damage (8-oxoG), DNA repair proteins (Ogg1, Ape1), and inflammation (glial fibrillary acidic protein).
- Immunohistochemistry and Nissl staining were employed to assess cellular and molecular changes in the prefrontal cortex and hippocampus.
Main Results:
- SHS exposure led to increased 8-oxoG (oxidative DNA damage) in the prefrontal cortex and hippocampus.
- Alterations in DNA repair proteins Ogg1 and Ape1 were observed, with Ogg1 reduced in some regions and Ape1 increased.
- Evidence of neuroinflammation, including activated astrocytes, was found in SHS-exposed mice.
Conclusions:
- SHS exposure induces significant oxidative DNA damage and neuroinflammation in the brain.
- Altered DNA repair mechanisms may contribute to the neurological consequences of chronic SHS exposure.
- Understanding these mechanisms can inform strategies to mitigate cognitive decline in exposed military personnel.
