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Rusch JA, Layden BT, Dugas LR. Signalling cognition: the gut microbiota and hypothalamic-pituitary-adrenal axis. Front Endocrinol (Lausanne) 2023; 14:1130689. [PMID: 37404311 PMCID: PMC10316519 DOI: 10.3389/fendo.2023.1130689] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2022] [Accepted: 05/25/2023] [Indexed: 07/06/2023] Open
Abstract
Cognitive function in humans depends on the complex and interplay between multiple body systems, including the hypothalamic-pituitary-adrenal (HPA) axis. The gut microbiota, which vastly outnumbers human cells and has a genetic potential that exceeds that of the human genome, plays a crucial role in this interplay. The microbiota-gut-brain (MGB) axis is a bidirectional signalling pathway that operates through neural, endocrine, immune, and metabolic pathways. One of the major neuroendocrine systems responding to stress is the HPA axis which produces glucocorticoids such as cortisol in humans and corticosterone in rodents. Appropriate concentrations of cortisol are essential for normal neurodevelopment and function, as well as cognitive processes such as learning and memory, and studies have shown that microbes modulate the HPA axis throughout life. Stress can significantly impact the MGB axis via the HPA axis and other pathways. Animal research has advanced our understanding of these mechanisms and pathways, leading to a paradigm shift in conceptual thinking about the influence of the microbiota on human health and disease. Preclinical and human trials are currently underway to determine how these animal models translate to humans. In this review article, we summarize the current knowledge of the relationship between the gut microbiota, HPA axis, and cognition, and provide an overview of the main findings and conclusions in this broad field.
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Affiliation(s)
- Jody A. Rusch
- Division of Chemical Pathology, Department of Pathology, University of Cape Town, Cape Town, South Africa
- C17 Chemical Pathology Laboratory, Groote Schuur Hospital, National Health Laboratory Service, Cape Town, South Africa
| | - Brian T. Layden
- Division of Endocrinology, Diabetes, and Metabolism, Department of Medicine, University of Illinois at Chicago, Chicago, IL, United States
- Department of Medicine, Jesse Brown Veterans Affairs Medical Center, Chicago, IL, United States
| | - Lara R. Dugas
- Division of Epidemiology and Biostatistics, School of Public Health, University of Cape Town, Cape Town, South Africa
- Public Health Sciences, Parkinson School of Health Sciences and Public Health, Loyola University Chicago, Maywood, IL, United States
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Ahn N, Nolde M, Krause E, Güntner F, Günter A, Tauscher M, Gerlach R, Meisinger C, Linseisen J, Baumeister SE, Rückert-Eheberg IM. Do proton pump inhibitors increase the risk of dementia? A systematic review, meta-analysis and bias analysis. Br J Clin Pharmacol 2023; 89:602-616. [PMID: 36331350 DOI: 10.1111/bcp.15583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 08/08/2022] [Accepted: 10/25/2022] [Indexed: 11/06/2022] Open
Abstract
AIM Previous studies on the association between proton pump inhibitor (PPI) intake and the increased risk of dementia has shown discrepancies in their conclusions. We aimed to provide updated evidence based on extensive bias assessments and quantitative sensitivity analyses. METHODS We searched the databases PubMed, EMBASE, SCOPUS, CENTRAL and clinicaltrials.gov for prospective studies that examined an association between PPI use and dementia, up to February 2022. Each study was assessed using the Cochrane risk of bias assessment tools for non-randomized studies of interventions (ROBINS-I) or randomized trials (RoB2). Pooled risk ratios (RRs) and 95% prediction intervals were computed using random-effects models. Sensitivity analyses were adjusted for small-study bias. RESULTS We included nine observational studies with 204 108 dementia cases in the primary analysis on the association between PPI use vs. non-use and dementia, and the RR was 1.16 (95% CI = 1.00; 1.35). After adjusting for small-study bias by Copas selection model and Rücker's shrinkage procedure, the RR was 1.16 (1.02; 1.32) and 1.15 (1.13; 1.17), respectively. A subgroup analysis of PPI use vs. non-use regarding Alzheimer's disease risk yielded an RR of 1.15 (0.89; 1.50). The secondary analysis on the risk of dementia by use of PPI vs. histamine-2 receptor antagonist showed an RR of 1.03 (0.66; 1.62). CONCLUSION This meta-analysis provided no clear evidence for an association between PPI intake and the risk of dementia. Due to discrepancies in sensitivity analyses, however, some risk of dementia by PPI use cannot be ruled out. Since an unequivocal conclusion is still pending, further research is warranted.
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Affiliation(s)
- Nayeon Ahn
- Institute for Medical Information Processing, Biometry, and Epidemiology (IBE), Ludwig Maximilian University of Munich, Munich, Germany
- Chair of Epidemiology, University of Augsburg, University Hospital Augsburg, Augsburg, Germany
| | - Michael Nolde
- Institute for Medical Information Processing, Biometry, and Epidemiology (IBE), Ludwig Maximilian University of Munich, Munich, Germany
- Chair of Epidemiology, University of Augsburg, University Hospital Augsburg, Augsburg, Germany
| | - Evamaria Krause
- Medical Library, Augsburg University Library, University of Augsburg, Augsburg, Germany
| | | | | | - Martin Tauscher
- Association of Statutory Health Insurance Physicians in Bavaria, Kassenärztliche Vereinigung Bayerns, KVB, Munich, Germany
| | - Roman Gerlach
- Association of Statutory Health Insurance Physicians in Bavaria, Kassenärztliche Vereinigung Bayerns, KVB, Munich, Germany
| | - Christa Meisinger
- Chair of Epidemiology, University of Augsburg, University Hospital Augsburg, Augsburg, Germany
| | - Jakob Linseisen
- Institute for Medical Information Processing, Biometry, and Epidemiology (IBE), Ludwig Maximilian University of Munich, Munich, Germany
- Chair of Epidemiology, University of Augsburg, University Hospital Augsburg, Augsburg, Germany
| | | | - Ina-Maria Rückert-Eheberg
- Institute for Medical Information Processing, Biometry, and Epidemiology (IBE), Ludwig Maximilian University of Munich, Munich, Germany
- Chair of Epidemiology, University of Augsburg, University Hospital Augsburg, Augsburg, Germany
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Yoon K, Kim JT, Kwack WG, Kim D, Lee KT, Yang S, Lee S, Choi YJ, Chung EK. Potentially Inappropriate Medication Use in Patients with Dementia. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:11426. [PMID: 36141699 PMCID: PMC9517486 DOI: 10.3390/ijerph191811426] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2022] [Revised: 09/07/2022] [Accepted: 09/08/2022] [Indexed: 06/16/2023]
Abstract
The objective of this study was to characterize the epidemiology of using potentially inappropriate medications associated with dementia exacerbation (DPIMs) in elderly outpatients with dementia. Electronic medical records were retrospectively reviewed for geriatric patients with dementia who were prescribed at least one medication in 2016 at a tertiary, university-affiliated hospital. The 2015 Beers criteria were used to define DPIMs. Logistic regression was performed to identify factors associated with prescribing DPIMs in patients with dementia. Among 2100 patients included in our study, 987 (47.0%) patients were prescribed at least one DPIM. Benzodiazepines were the most frequently prescribed DPIM followed by anticholinergics, histamine H2-receptor blockers, and zolpidem. The risk of prescribing DPIMs was significantly increased in female patients (odds ratio (OR) 1.355) with polypharmacy (OR 5.146) and multiple comorbidities (OR 1.129) (p < 0.05 for all). Coexistence of Parkinson's disease (OR 1.799), mood disorder (OR 1.373), or schizophrenia (OR 4.116) in patients with dementia further increased the likelihood of receiving DPIMs. In conclusion, DPIMs were commonly used in elderly patients with dementia in Korea with benzodiazepines most frequently prescribed followed by anticholinergics. Female patients using polypharmacy with multiple comorbidities should be closely monitored to minimize unnecessary DPIM use and, ultimately, DPIM-related harms.
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Affiliation(s)
- Kyungwon Yoon
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
- Department of Pharmacy, Kyung Hee University Hospital, Seoul 02447, Korea
| | - Jung-Tae Kim
- Department of Pharmacy, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea
| | - Won-Gun Kwack
- Division of Pulmonary, Allergy and Critical Care Medicine, Kyung Hee University Hospital, Seoul 02447, Korea
| | - Donghyun Kim
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
| | - Kyung-Tae Lee
- Department of Biomedical and Pharmaceutical Sciences, Graduate School, Kyung Hee University, Seoul 02447, Korea
- Department of Pharmaceutical Biochemistry, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
| | - Seungwon Yang
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
- Department of Regulatory Science, College of Pharmacy, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Sangmin Lee
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
- Department of Regulatory Science, College of Pharmacy, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Yeo-Jin Choi
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
- Department of Regulatory Science, College of Pharmacy, Graduate School, Kyung Hee University, Seoul 02447, Korea
| | - Eun-Kyoung Chung
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea
- Department of Pharmacy, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea
- Department of Regulatory Science, College of Pharmacy, Graduate School, Kyung Hee University, Seoul 02447, Korea
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