The objective of the proposed basic research is to make clinically-relevant discoveries regarding prenatal alcohol (ethanol) exposure-induced pathology involving the brain and face. This proposal builds naturally on our CIFASD-supported basic research to date and continues to address the need for a more complete understanding of the spectrum and exposure stage-dependency of abnormalities caused by maternal alcohol use. Utilizing a well-established FASD mouse model, along with innovative technologies and approaches, and addressing 3 Specific Aims, we propose to test the overall hypothesis that alcohol induces structural abnormalities of the brain and face in mice that are consistent with and informative for those in human FASD.
The Aim 1 studies compliment and extend the clinical research proposed by Drs. Foroud and Hammond. They employ Magnetic Resonance Imaging (MRI) and dense surface modeling (DSM) for experiments that are designed to identify exposure stage-dependent correlative abnormalities of the brain and face.
The Aim 2 studies compliment and extend the Sowell group's neuroimaging-based clinical studies while following up on preliminary findings of cerebro-cortical thickness alterations in our mouse model. For this, MRI-based assessments of regional brain volumes and cerebro-cortical thickness changes, along with DTI-based investigations of fiber tract and structural connectivity alterations in adult animals are proposed.
The Aim 3 studies are directed toward further defining the histopathology and genesis of early prenatal alcohol exposure- induced regional brain dysmorphology. They will employ routine histological methods, as well as immunohistochemistry, and stereology. Specimens selected for detailed histological analyses will include those postnatal brains that had previously been imaged and analyzed for Aim 2. Additional Aim 3 studies will focus on prenatal stages and will address the novel concept that early alcohol insult yields changes in Cajal-Retzius cell populations;changes that underlie subsequent cerebro-cortical lamination defects. The proposed work is consistent with the overall purpose/goals of the CIFASD in that it will facilitate diagnosis of the full range of birth defects associated with prenatal alcohol exposure, and it will aid in elucidating biological mechanisms that contribute to alcohol teratogenesis. The results of the proposed studies promise to fill a significant FASD research void, inform human clinical research, and continue to highlight the first trimester as a critical period for alcohol-induced defects of the face and brain.
Fetal Alcohol Spectrum Disorder (FASD) remains a major public health problem. The proposed research employs a well-established mouse model to answer FASD-related questions that are impossible to address in clinical studies. Focusing on stage of exposure-dependent facial and brain abnormalities, the results of this work promise to expand our understanding of the temporal dependence, interrelatedness, and mechanisms underlying birth defects that result from maternal alcohol use.
|Kietzman, Henry W; Everson, Joshua L; Sulik, Kathleen K et al. (2014) The teratogenic effects of prenatal ethanol exposure are exacerbated by Sonic Hedgehog or GLI2 haploinsufficiency in the mouse. PLoS One 9:e89448|
|Lipinski, Robert J; Holloway, Hunter T; O'Leary-Moore, Shonagh K et al. (2014) Characterization of subtle brain abnormalities in a mouse model of Hedgehog pathway antagonist-induced cleft lip and palate. PLoS One 9:e102603|
|Cao, Wei; Li, Wei; Han, Hui et al. (2014) Prenatal alcohol exposure reduces magnetic susceptibility contrast and anisotropy in the white matter of mouse brains. Neuroimage 102 Pt 2:748-55|
|Parnell, Scott E; Holloway, Hunter T; O'Leary-Moore, Shonagh K et al. (2013) Magnetic resonance microscopy-based analyses of the neuroanatomical effects of gestational day 9 ethanol exposure in mice. Neurotoxicol Teratol 39:77-83|