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Published on: July 13, 2014
Prenatal Alcohol Exposure Disrupts CXCL16 Expression in Rat Hippocampus: Temporal and Sex Differences
Mayra Madeleine Padilla-Valdez1, Margarita Belem Santana-Bejarano2, Marisol Godínez-Rubí2
1Laboratorio de Neuroinmunobiología Molecular, Instituto de Investigación en Ciencias Biomédicas (IICB), Centro Universitario de Ciencias de la Salud, Universidad de Guadalajara, Guadalajara C.P. 44340, Mexico.
Insights
Prenatal alcohol exposure (PAE) increases brain chemokine CXCL16, impacting neurodevelopment. This study reveals sex-specific effects and suggests CXCL16
Area of Science:
- Neuroscience
- Immunology
- Developmental Biology
Background:
- Prenatal alcohol exposure (PAE) is a significant risk to newborns, impacting brain development.
- PAE induces proinflammatory cytokines and chemokines, disrupting neuronal processes like migration, survival, and proliferation.
- Chemokines, such as CXCL16, are implicated in brain impairments, including those from PAE.
Purpose of the Study:
- To investigate the role and expression patterns of the chemokine CXCL16 in the brain following PAE.
- To explore potential sex-specific differences and developmental stage variations in CXCL16 expression.
- To examine the nuclear localization of CXCL16 and its implications for gene regulation in the context of PAE.
Main Methods:
- Utilized mouse models to study the effects of PAE on brain gene expression.
- Analyzed CXCL16 expression across different developmental stages and sexes.
- Investigated the subcellular localization of CXCL16 within neurons.
Main Results:
- CXCL16 expression in the brain is altered by PAE and shows variations based on developmental stage and sex.
- Female brains exhibit potential estrogen-related modulation of CXCL16, possibly linked to an alcohol-mediated rebound effect.
- Male hippocampi demonstrated greater resilience to PAE-induced changes in CXCL16.
- CXCL16 was found in neuronal nuclei, suggesting a role in gene regulation.
Conclusions:
- CXCL16 plays a role in neurodevelopmental processes affected by PAE, with distinct sex-specific responses.
- The findings highlight the involvement of chemokines in hippocampal neuroplasticity following PAE.
- This research may inform future therapeutic strategies for fetal alcohol spectrum disorder (FASD).
Abstract:
Prenatal alcohol exposure (PAE) affects around 40,000 newborns every year and poses a significant health risk. Although much is already known about the neurotoxic mechanisms of PAE, new findings continue to emerge. Studies with mouse models show that PAE leads to overexpression of proinflammatory cytokines and chemokines in the brain, which disrupts important neurodevelopmental processes such as cell migration, survival and proliferation of neurons. The chemokine CXCL16 is overexpressed in the brain following various impairments, including PAE. This study shows that CXCL16 expression varies by developmental stage and sex, consistent with known sexual dimorphism in immune responses. In females, CXCL16 expression may be influenced by estrogen-related mechanisms, possibly related to the alcohol-mediated rebound effect described here. In contrast, the male hippocampus shows greater resilience to PAE-induced CXCL16 changes. Furthermore, the presence of CXCL16 in neuronal nuclei suggests a role in gene regulation, similar to other chemokines such as CCL5 and CXCL4. These findings shed light on the role of chemokines in hippocampal neuroplasticity and may pave the way for better treatment of fetal alcohol spectrum disorder (FASD).
