Original Research ARTICLE
Widespread Cortical Thickness is Associated with Neuroactive Steroid Levels
- 1Mental Illness Research, Education and Clinical Centers MIRECC (VA), United States
- 2Department of Psychiatry and Behavioral Sciences, School of Medicine, Duke University, United States
- 3Brain Imaging and Analysis Center, Duke University, United States
Background: Neuroactive steroids are endogenous molecules with regenerative and neuroprotective actions. Both cortical thickness and many neuroactive steroid levels decline with age and are decreased in several neuropsychiatric disorders. However, a systematic examination of the relationship between serum neuroactive steroid levels and in vivo measures of cortical thickness in humans is lacking.
Methods: Peripheral serum levels of seven neuroactive steroids were assayed in US military veterans. All (n = 143) subsequently underwent high-resolution structural MRI, followed by parcellelation of the cortical surface into 148 anatomically-defined regions. Regression modeling was applied to test the association between neuroactive steroid levels and hemispheric total gray matter volume as well as region-specific cortical thickness. False discovery rate (FDR) correction was used to control for Type 1 error from multiple testing.
Results: Neuroactive steroid levels of allopregnanolone and pregnenolone were positively correlated with gray matter thickness in multiple regions of cingulate, parietal, and occipital association cortices (r = 0.20 to 0.47; p<0.05; FDR-corrected).
Conclusions: Positive associations between serum neuroactive steroid levels and gray matter cortical thickness are found in multiple brain regions. If these results are confirmed, neuroactive steroid levels and cortical thickness may help in monitoring the clinical response in future intervention studies of neuroregenerative therapies.
Keywords: Neuroactive steroids, Cortical thickess, MRI, Neuroregeneration, Neuroprotection, gray matter
Received: 13 Jun 2019;
Accepted: 03 Oct 2019.
Copyright: © 2019 Morey, Davis, Haswell, Naylor, Kilts, Szabo, Shampine, Sun, Swanson, Wagner and Marx. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
* Correspondence: Dr. Rajendra A. Morey, Mental Illness Research, Education and Clinical Centers MIRECC (VA), Washington D.C., United States, email@example.com