1
|
Li T, Pappas C, Klinedinst B, Pollpeter A, Larsen B, Hoth N, Anton F, Wang Q, Willette AA. Associations Between Insulin-Like Growth Factor-1 and Resting-State Functional Connectivity in Cognitively Unimpaired Midlife Adults. J Alzheimers Dis 2023; 94:S309-S318. [PMID: 36710671 PMCID: PMC10473072 DOI: 10.3233/jad-220608] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/19/2022] [Indexed: 01/25/2023]
Abstract
BACKGROUND Insulin-like growth factor (IGF)-1 plays an important role in Alzheimer's disease (AD) pathogenesis and increases disease risk. However, prior research examining IGF-1 levels and brain neural network activity is mixed. OBJECTIVE The present study investigated the relationship between IGF-1 levels and 21 neural networks, as measured by functional magnetic resonance imaging (fMRI) in 13,235 UK Biobank participants. METHODS Linear mixed models were used to regress IGF-1 against the intrinsic functional connectivity (i.e., degree of network activity) for each neural network. Interactions between IGF-1 and AD risk factors such as Apolipoprotein E4 (APOE4) genotype, sex, AD family history, and age were also tested. RESULTS Higher IGF-1 was associated with more network activity in the right Executive Function neural network. IGF-1 interactions with APOE4 or sex implicated motor, primary/extrastriate visual, and executive function related neural networks. Neural network activity trends with increasing IGF-1 were different in different age groups. Higher IGF-1 levels relate to much more network activity in the Sensorimotor Network and Cerebellum Network in early-life participants (40-52 years old), compared with mid-life (52-59 years old) and late-life (59-70 years old) participants. CONCLUSION These findings suggest that sex and APOE4 genotype may modify the relationship between IGF-1 and brain network activities related to visual, motor, and cognitive processing. Additionally, IGF-1 may have an age-dependent effect on neural network connectivity.
Collapse
Affiliation(s)
- Tianqi Li
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
- Genetics and Genomics Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
| | - Colleen Pappas
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
| | - Brandon Klinedinst
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
- Neuroscience Interdepartmental Graduate Program Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
| | - Amy Pollpeter
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
- Bioinformatics and Computational Biology Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
| | - Brittany Larsen
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
- Neuroscience Interdepartmental Graduate Program Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
| | - Nathan Hoth
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
| | - Faith Anton
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
| | - Qian Wang
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
| | - Auriel A. Willette
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA, USA
- Genetics and Genomics Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
- Neuroscience Interdepartmental Graduate Program Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
- Bioinformatics and Computational Biology Interdepartmental Graduate Program, Iowa State University, Ames, IA, USA
- Department of Neurology, University of Iowa, Iowa City, IA, USA
| |
Collapse
|
2
|
Willette AA, Pappas C, Hoth N, Wang Q, Klinedinst B, Willette SA, Larsen B, Pollpeter A, Li T, Le S, Collazo-Martinez AD, Mochel JP, Allenspach K, Dantzer R. Inflammation, negative affect, and amyloid burden in Alzheimer's disease: Insights from the kynurenine pathway. Brain Behav Immun 2021; 95:216-225. [PMID: 33775832 PMCID: PMC8187283 DOI: 10.1016/j.bbi.2021.03.019] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 03/17/2021] [Accepted: 03/22/2021] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Depressive symptoms in Alzheimer's disease (AD) predict worse cognitive and functional outcomes. Both AD and major depression inflammatory processes are characterized by shunted tryptophan metabolism away from serotonin (5-HT) and toward the neuroinflammatory kynurenine (Kyn) pathway. The present study assessed associations between Kyn and behavioral, neuroanatomical, neuropathological, and physiological outcomes common to both AD and negative affect across the AD continuum. METHODS In 58 cognitively normal, 396 mild cognitive impairment, and 112 AD participants from the Alzheimer's Disease Neuroimaging Initiative-1 (ADNI1) cohort, serum markers of 5-HT, tryptophan, and Kyn were measured and their relationships investigated with immunologic markers, affect and functional outcomes, CSF markers of beta-amyloid (Aβ) and tau, and regional gray matter. RESULTS A higher Kyn/Tryptophan ratio was linked to many inflammatory markers, as well as lower functional independence and memory scores. A higher Kyn/5-HT ratio showed similar associations, but also strong relationships with negative affect and neuropsychiatric disturbance, executive dysfunction, and global cognitive decline. Further, gray matter atrophy was seen in hippocampus, anterior cingulate, and prefrontal cortices, as well as greater amyloid and total tau deposition. Finally, using moderated-mediation, several pro-inflammatory factors partially mediated Kyn/5-HT and negative affect scores in participants with subclinical Aβ (i.e., Aβ-), whereas such associations were fully mediated by Complement 3 in Aβ+ participants. CONCLUSION These findings suggest that inflammatory signaling cascades may occur during AD, which is associated with increased Kyn metabolism that influences the pathogenesis of negative affect. Aβ and the complement system may be critical contributing factors in this process.
Collapse
Affiliation(s)
- Auriel A. Willette
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA,Neuroscience Graduate Program, Iowa State University, Ames, IA,Department of Psychology, Iowa State University, Ames, IA,Department of Neurology, University of Iowa, Iowa City, IA,Bioinformatics and Computational Biology Graduate Program, Iowa State University, Ames, IA,Department of Biomedical Sciences, Iowa State University, Ames, IA, USA,Address Correspondence to: Auriel A. Willette, Ph.D., M.S., 1109 HNSB, 706 Morrill Rd., Ames, IA 50011, Phone: (515) 294-3110,
| | - Colleen Pappas
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA
| | - Nathan Hoth
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA
| | - Qian Wang
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA
| | | | - Sara A. Willette
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA
| | - Brittany Larsen
- Neuroscience Graduate Program, Iowa State University, Ames, IA
| | - Amy Pollpeter
- Bioinformatics and Computational Biology Graduate Program, Iowa State University, Ames, IA
| | - Tianqi Li
- Bioinformatics and Computational Biology Graduate Program, Iowa State University, Ames, IA
| | - Scott Le
- Department of Food Science and Human Nutrition, Iowa State University, Ames, IA
| | | | | | - Karin Allenspach
- Department of Veterinary Clinical Sciences, Iowa State University, Ames, IA, USA
| | - Robert Dantzer
- Department of Symptom Research, The University of Texas MD Anderson Cancer Center, Houston,TX
| | | |
Collapse
|