Abstract
Obesity, the cessation of ovarian steroids with menopause, and age are risk factors for mood disorders, dementia, and Alzheimer’s disease (AD). However, immediate hormone therapy (HT) after menopause may have beneficial effects in different brain regions involved in memory and cognition. To more closely replicate the age, endocrine, and metabolic environment of obese postmenopausal women, either on or off HT, middle-aged female rhesus macaques were ovariectomized/hysterectomized (OvH) and maintained on a high-fat, high-sugar, obesogenic Western-style diet (WSD) for 30 months; half of the animals received HT immediately after OvH and half served as placebo controls. RNAseq of the occipital (OC) and prefrontal cortex (PFC), hippocampus (HIP), and amygdala (AMG) identified 293, 379, 505, and 4993 differentially expressed genes (DEGs), respectively. Pathway enrichment analysis identified an activation of neuroinflammation in OC and HIP, but an inhibition in the AMG with HT. Synaptogenesis, circadian rhythm, mitochondrial dysfunction, mTOR, glutamate, serotonin, GABA, dopamine, epinephrine/norepinephrine, glucocorticoid receptor signaling, neuronal NOS, and amyloid processing were exclusively enriched in AMG. As compared to the placebo control group, most of these signaling pathways are downregulated after HT, suggesting a protective effect of HT in OvH females under a WSD. Overall, our results suggest that a chronic obesogenic diet may induce a wide range of alterations in multiple signaling pathways that are linked to age-associated brain pathology and dementia. In these individuals, HT seems to have a protective effect against neuroinflammation, amyloid beta depositions, and tau tangle formation.
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Data availability
All relevant data was provided upon the submission of this manuscript. RNAseq data is deposited in GSE174153.
Code availability
Code is available upon request.
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Acknowledgements
We thank Carlos Aylwin Ramirez for his assistance in qPCR analysis.
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This work was supported by National Institutes of Health grants AG-029612, AG-062220, OD-011092, and OD-011895.
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HFU, SGK, and RPCJ were responsible for the study concept and design. HFU and SGK contributed to the acquisition of animal data. RPCJ performed the RNA extractions and RNAseq libraries. PD conducted the bioinformatic analysis. MB performed the qPCR analysis. HFU, SGK, and RPCJ contributed data analysis and interpretation of findings. HFU, SGK, and RPCJ drafted the manuscript. All authors critically reviewed content and approved final version for publication.
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Ward plots showing clusters of genes showing similar patterns of differential expression between groups (OvH vs OvH-HT) across tissues: OC (a, b), PCF (c, d), HIP (e, f) and AMG (g, h). The number of genes included in each cluster is shown above each plot, and the samples within each group are shown in the x axis (PNG 2126 kb)
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Cervera-Juanes, R., Darakjian, P., Ball, M. et al. Effects of estradiol supplementation on the brain transcriptome of old rhesus macaques maintained on an obesogenic diet. GeroScience 44, 229–252 (2022). https://doi.org/10.1007/s11357-021-00453-8
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DOI: https://doi.org/10.1007/s11357-021-00453-8