Functional neuroimaging using 3T fMRI has revolutionized our ability to study of the brain's higher cognitive and affective functions in health and disease and reveal the neurobiological basis for wide-range individual differences (traits) in cognitive and affective processing, vulnerability and resilience to disease. For instance, neuroanatomical variability associated with long-standing personality traits may explain why certain individuals are vulnerable to psychiatric disease, dementia or show inefficient response mechanisms to systemic diseases. Structural 3T neuroimaging can also be particularly useful for in vivo detection of pathological processes that correlate with certain behaviors, such as with alcohol consumption. This past year, I performed voxel based morphometry analyses on structural MRI scans to explore the neuroanatomical variability associated with long-standing personality traits, which may explain why certain individuals are vulnerable to psychiatric disease, dementia or show inefficient psychological response mechanisms to systemic diseases. Specifically, I found neuroanatomical differences related to the Five Factors of Personality (currently under peer review in the journal """"""""Human Brain Mapping""""""""). Moreover, I performed a voxel based morphometry analysis in Baltimore Longitudinal Study of Aging (BLSA) participants and detected a significant volumetric decrease in the premotor portion of the frontal corpus callosum associated with alcohol consumption, controlling for dietary, demographic and cardiovascular risk factors (currently under peer review in the journal """"""""European Neuropsychopharmacology""""""""). This finding may help explain why this same region may develop degeneration and necrosis in alcoholism (Marchiafava-Bignami disease). Finally, I performed a pilot fMRI study on food apetitiveness,which will be incorporated in the study of cannabinoid receptor drugs. The goal of this future study is to demonstrate a rise in insulin levels in response to food visual stimuli (cephalic insulin response) as a result of activation of certain brain areas. Moreover, given the presence of endocannabinoid receptors in the candidate areas, we aim to demonstrate a difference in their level of activation with cannabinoid drugs. """"""""Development of 3T MRI methods"""""""": Over this last year, this protocol was used to develop the following applications: a tissue segmentation algorithm for fat quantification in the abdomen and thigh, which will be used in the BLSA to assess the association of subcutaneous and visceral fat with markers of inflammation;a tissue segmentation algorithms for fat quantification in the thymus gland, which is being used in the study of growth hormone supplementation;phosphorus spectroscopy to assess the energy consumption of exercising muscle, which will be used in the BLSA;fMRI paradigms to assess memory encoding and risk taking and decision making, which will be used in the BLSA;fMRI paradigms to assess appetitiveness for foods, which will be used in the study of cannabinoid receptor drugs;and development of resting state fMRI and brain spectroscopy (detailed above).
| Mullins, Roger; Reiter, David; Kapogiannis, Dimitrios (2018) Magnetic resonance spectroscopy reveals abnormalities of glucose metabolism in the Alzheimer's brain. Ann Clin Transl Neurol 5:262-272 |
| Mullins, Roger J; Diehl, Thomas C; Chia, Chee W et al. (2017) Insulin Resistance as a Link between Amyloid-Beta and Tau Pathologies in Alzheimer's Disease. Front Aging Neurosci 9:118 |
| Willette, Auriel A; Modanlo, Nina; Kapogiannis, Dimitrios et al. (2015) Insulin resistance predicts medial temporal hypermetabolism in mild cognitive impairment conversion to Alzheimer disease. Diabetes 64:1933-40 |
| Willette, Auriel A; Kapogiannis, Dimitrios (2015) Does the brain shrink as the waist expands? Ageing Res Rev 20:86-97 |
| Kapogiannis, Dimitrios; Deshpande, Gopikrishna; Krueger, Frank et al. (2014) Brain networks shaping religious belief. Brain Connect 4:70-9 |
| Willette, Auriel A; Calhoun, Vince D; Egan, Josephine M et al. (2014) Prognostic classification of mild cognitive impairment and Alzheimer's disease: MRI independent component analysis. Psychiatry Res 224:81-8 |
| Kapogiannis, Dimitrios; Reiter, David A; Willette, Auriel A et al. (2013) Posteromedial cortex glutamate and GABA predict intrinsic functional connectivity of the default mode network. Neuroimage 64:112-9 |
| Kapogiannis, Dimitrios; Sutin, Angelina; Davatzikos, Christos et al. (2013) The five factors of personality and regional cortical variability in the Baltimore longitudinal study of aging. Hum Brain Mapp 34:2829-40 |
| Kapogiannis, Dimitrios; Kisser, Jason; Davatzikos, Christos et al. (2012) Alcohol consumption and premotor corpus callosum in older adults. Eur Neuropsychopharmacol 22:704-10 |
| Makrogiannis, Sokratis; Ramachandran, Ramona; Fishbein, Kenneth W et al. (2011) Towards segmentation of the thymus in fat and water parametric MR images. Conf Proc IEEE Eng Med Biol Soc 2011:8078-81 |
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