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Aliashrafi M, Nasehi M, Zarrindast MR, Joghataei MT, Zali H, Siadat SD. Intracerebroventricular Cutibacterium acnes Generates Manifestations of Alzheimer's Disease-like Pathology in the Rat Hippocampus. Neuroscience 2024; 540:103-116. [PMID: 38266907 DOI: 10.1016/j.neuroscience.2024.01.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2023] [Revised: 01/13/2024] [Accepted: 01/16/2024] [Indexed: 01/26/2024]
Abstract
The infection hypothesis is a new causative explanation for Alzheimer's disease (AD). In recent decades, various species of bacterial pathogens have been distinguished in the autopsy of Alzheimer's patients; however, the mechanism of bacterial contribution to AD pathology is still unknown. To explore the hypothesis, Cutibacterium acnes (C. acnes) was selected, and effects of its intracerebroventricular (ICV) inoculation in rats was evaluated. The results revealed that C. acnes causes memory impairment, which might be a consequence of upregulated Amyloid β (Aβ) deposits in the hippocampus; Aβ aggregates are co-localized with C. acnes colonies. The key point of our hypothesis is that the activation of the innate immune system by C. acnes through the TLR2/NF-κB/NLRP3 signaling pathway, eventually leads to increased neuroinflammation, which might be resulted from microgliosis and astrogliosis. Neuroinflammation increases oxidative stress and cell apoptosis. Overall, the obtained results of this study support our hypothesis that brain exposure to C. acnes prompted neuroinflammation with similar AD-like pathology.
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Affiliation(s)
- Morteza Aliashrafi
- Department of Cognitive Neuroscience, Institute for Cognitive Science Studies, Tehran, Iran; Shahid Beheshti University, Tehran, Iran
| | - Mohammad Nasehi
- Cognitive and Neuroscience Research Center, Amir-Almomenin Hospital, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran.
| | - Mohammad-Reza Zarrindast
- Department of Cognitive Neuroscience, Institute for Cognitive Science Studies, Tehran, Iran; Department of Pharmacology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad-Taghi Joghataei
- Cellular and Molecular Research Center, Department of Neuroscience, Iran University of Medical Science, Tehran, Iran
| | - Hakimeh Zali
- Department of Tissue Engineering and Applied Cell Sciences, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
| | - Seyed Davar Siadat
- Department of Mycobacteriology and Pulmonary Research, Microbiology Research Center, Pasteur Institute of Iran, Tehran, Iran
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Aytekin Sahin G, Karabulut D, Unal G, Sayan M, Sahin H. Effects of probiotic supplementation on very low dose AFB1-induced neurotoxicity in adult male rats. Life Sci 2022; 306:120798. [PMID: 35843344 DOI: 10.1016/j.lfs.2022.120798] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/07/2022] [Accepted: 07/08/2022] [Indexed: 12/24/2022]
Abstract
AIMS Aflatoxin B1 (AFB1) is the most toxic and common form of AF found in food and feed. Although AFB1 exposure has toxic effects on many organs, studies on the brain are limited. Moreover, to the best of our knowledge, there is no study on the effect of probiotics on AFB1-induced neurotoxicity. Therefore, we aimed to evaluate the possible effects of probiotics on AFB1-induced neurotoxicity in the brain. MAIN METHODS Thirty-two adult male Wistar rats were divided into four groups: Vehicle (VEH), Probiotic (PRO) (2.5 × 1010 CFU/day VSL#3, orally), Aflatoxin B1 (AFB1) (25 μg/kg/week AFB1, orally), and Aflatoxin B1 + Probiotic (AFB1 + PRO) (2.5 × 1010 CFU/day VSL#3 + 25 μg/kg/week AFB1, orally). At the end of eight weeks, rats were behaviorally evaluated by the open field test, novel object recognition test, and forced swim test. Then, oxidative stress and inflammatory markers in brain tissues were analyzed. Next, brain sections were processed for Hematoxylin&Eosin staining and NeuN and GFAP immunostaining. KEY FINDINGS Probiotic supplementation tended to decrease oxidative stress and inflammatory markers compared to the AFB1 group. Besides, brain tissues had more normal histological structures in VEH, PRO, and AFB1 + PRO groups than in the AFB1 group. Moreover, in probiotic groups, GFAP immunoreactivity intensity was decreased, while NeuN-positive cell number increased in brain tissues compared to the AFB1 group. SIGNIFICANCE Probiotics seem to be effective at reducing the neurotoxic effects of AFB1. Thus, our study suggested that especially Bifidobacterium and Lactobacillus species can improve AFB1-induced neurotoxicity with their antioxidant and anti-inflammatory effects.
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Affiliation(s)
- Gizem Aytekin Sahin
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Nuh Naci Yazgan University, Kayseri, Turkey.
| | - Derya Karabulut
- Department of Histology and Embryology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Gokhan Unal
- Department of Pharmacology, Faculty of Pharmacy, Erciyes University, Kayseri, Turkey
| | - Meryem Sayan
- Department of Histology and Embryology, Faculty of Medicine, Erciyes University, Kayseri, Turkey
| | - Habibe Sahin
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Erciyes University, Kayseri, Turkey
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Alonazi M, Ben Bacha A, Al Suhaibani A, Almnaizel AT, Aloudah HS, El-Ansary A. Psychobiotics improve propionic acid-induced neuroinflammation in juvenile rats, rodent model of autism. Transl Neurosci 2022; 13:292-300. [PMID: 36133749 PMCID: PMC9462542 DOI: 10.1515/tnsci-2022-0226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2022] [Revised: 06/02/2022] [Accepted: 06/02/2022] [Indexed: 11/15/2022] Open
Abstract
This study aimed to evaluate the protective and therapeutic potency of bee pollen and probiotic mixture on brain intoxication caused by propionic acid (PPA) in juvenile rats. Five groups of six animals each, were used: the control group only receiving phosphate-buffered saline; the bee pollen and probiotic-treated group receiving a combination of an equal quantity of bee pollen and probiotic (0.2 kg/kg body weight); the PPA group being treated for 3 days with an oral neurotoxic dose of PPA (0.25 kg/kg body weight); the protective and therapeutic groups receiving bee pollen and probiotic mixture treatment right before and after the neurotoxic dose of PPA, respectively. The levels of interleukin (IL)-1ß, IL-6, IL-8, IL-10, IL-12, tumor necrosis factor α, and interferon γ (IFN-γ) were investigated to evaluate the neuroinflammatory responses in brain tissues from different animal groups. The much higher IL-1β, IL-8, and IFN-γ, as pro-inflammatory cytokines (P < 0.001), together with much lower IL-10, as anti-inflammatory cytokine (P < 0.001) compared to controls clearly demonstrated the neurotoxic effects of PPA. Interestingly, the mixture of bee pollen and probiotics was effective in alleviating PPA neurotoxic effects in both therapeutic and protective groups demonstrating highly significant changes in IL-1β, IL-8, IL-10, and IFN-γ levels together with non-significant reduction in IL-6 levels compared to PPA-treated rats. Overall, our findings demonstrated a new approach to the beneficial use of psychobiotics presenting as bee pollen and probiotic combination in neuroinflammation through cytokine changes as a possible role of glial cells in gut–brain axis.
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Affiliation(s)
- Mona Alonazi
- Biochemistry Department, Science College, King Saud University, Riyadh 11495, Saudi Arabia
| | - Abir Ben Bacha
- Biochemistry Department, Science College, King Saud University, P.O Box 22452, Riyadh 11495, Saudi Arabia.,Laboratory of Plant Biotechnology Applied to Crop Improvement, Faculty of Science of Sfax, University of Sfax, Sfax, Tunisia
| | - Anwar Al Suhaibani
- Biochemistry Department, Science College, King Saud University, Riyadh 11495, Saudi Arabia
| | - Ahmad T Almnaizel
- Experimental Surgery and Animal Laboratory, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Hisham S Aloudah
- Experimental Surgery and Animal Laboratory, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Afaf El-Ansary
- Central Laboratory, King Saud University, Riyadh, Saudi Arabia
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4
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Ben Bacha A, Al‐Orf N, Alonazi M, Bhat RS, El‐Ansary A. The anti-inflammatory and antiapoptotic effects of probiotic on induced neurotoxicity in juvenile hamsters. Food Sci Nutr 2021; 9:4874-4882. [PMID: 34531999 PMCID: PMC8441441 DOI: 10.1002/fsn3.2435] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2021] [Revised: 05/04/2021] [Accepted: 05/06/2021] [Indexed: 12/12/2022] Open
Abstract
Brain inflammation and apoptosis play crucial roles in the pathogenesis of various neurodevelopmental disorders. Probiotics have been shown to confer protection against many stresses, including apoptosis and inflammation, by modulating the gut function. The short-chain fatty acid, propionic acid (PPA), plays an important intermediate of cellular metabolism. Although PPA exhibits numerous beneficial biological effects, its accumulation is neurotoxic. This study focused on the therapeutic potency of probiotics against PPA-induced apoptosis and neuroinflammation in hamsters. Five groups of male golden Syrian hamsters were treated as follows: Group I as control; Group II as PPA-treated with three doses of 250 mg PPA/kg/day; Group III as clindamycin-treated with a single dose of 30 mg clindamycin/kg; Group IV as PPA-probiotic; and Group V as clindamycin-probiotic were two therapeutic groups which were treated with the same doses of PPA and clindamycin, respectively, followed by treatment with 0.2 g kg-1 d-1 of probiotic (ProtexinR, Probiotics International Limited) for three weeks. Proapoptotic markers, such as caspases 3 and 7; neuroinflammation markers, such as interleukins 1β and 8; and heat shock protein 70 were measured in the brain. Significant increase of all measured markers (p ˂ .001) was observed in PPA and clindamycin-treated hamsters compared with controls. Probiotics significantly reduced the damages and ameliorated all the test markers in both therapeutic groups compared with the control. Our results confirmed that probiotics can be utilized as a feasible strategy for managing apoptotic and inflammation-related stresses in brain disorders by retaining the gut function.
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Affiliation(s)
- Abir Ben Bacha
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
- Laboratory of Plant Biotechnology Applied to Crop ImprovementFaculty of Science of SfaxUniversity of SfaxSfaxTunisia
| | - Norah Al‐Orf
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Mona Alonazi
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Ramesa Shafi Bhat
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Afaf El‐Ansary
- Central LaboratoryKing Saud UniversityRiyadhSaudi Arabia
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Al Suhaibani A, Ben Bacha A, Alonazi M, Bhat RS, El‐Ansary A. Testing the combined effects of probiotics and prebiotics against neurotoxic effects of propionic acid orally administered to rat pups. Food Sci Nutr 2021; 9:4440-4451. [PMID: 34401092 PMCID: PMC8358352 DOI: 10.1002/fsn3.2418] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 11/13/2022] Open
Abstract
The present study investigated the combined effects of mixed probiotic and bee pollen on brain intoxication induced by propionic acid (PPA) in rat pups. Thirty western albino rats were divided into five groups, six animals each: (1) Control group receiving phosphate-buffered saline; (2) Probiotic and bee pollen-treated group being administered at the same dose with 200 mg/kg body weight; (c) PPA-treated group receiving a neurotoxic dose 250 mg/kg body weight of PPA for 3 days; (d) Therapeutic group being administered the neurotoxic dose of PPA followed by probiotic and bee pollen treatment 200 mg/kg body weight; (e) Protective group receiving probiotic and bee pollen mixture treatment followed by neurotoxic dose of PPA. Selected biochemical parameters linked to oxidative stress, energy metabolism, and neurotransmission were investigated in brain homogenates from all the five groups. PPA treatment showed an increase in oxidative stress markers like lipid peroxidation coupled with a significant decrease in glutathione level. Impaired energy metabolism was ascertained via the alteration of creatine kinase (CK) and lactate dehydrogenase (LDH) activities. Dramatic increase of Na+ and K+ concentrations together with a decrease of GABA and IL-6 and an elevation of glutamate levels in PPA-treated rat's pups confirmed the neurotoxicity effect of PPA. Interestingly, the mixed probiotic and bee pollen treatment were effective in restoring the levels of glutamate, GABA, and IL-6 in addition to normalizing the levels of lipid peroxidation and glutathione and the activities of CK and LDH. The present study indicates that mixed probiotic and bee pollen treatment can improve poor detoxification, oxidative stress, and neuroinflammation as mechanisms implicated in the etiology of autism.
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Affiliation(s)
- Anwar Al Suhaibani
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Abir Ben Bacha
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
- Laboratory of Plant Biotechnology Applied to Crop ImprovementFaculty of Science of SfaxUniversity of SfaxSfaxTunisia
| | - Mona Alonazi
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Ramesa Shafi Bhat
- Biochemistry DepartmentScience CollegeKing Saud UniversityRiyadhSaudi Arabia
| | - Afaf El‐Ansary
- Central LaboratoryKing Saud UniversityRiyadhSaudi Arabia
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Niccolai E, Di Pilato V, Nannini G, Baldi S, Russo E, Zucchi E, Martinelli I, Menicatti M, Bartolucci G, Mandrioli J, Amedei A. The Gut Microbiota-Immunity Axis in ALS: A Role in Deciphering Disease Heterogeneity? Biomedicines 2021; 9:biomedicines9070753. [PMID: 34209688 PMCID: PMC8301418 DOI: 10.3390/biomedicines9070753] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2021] [Revised: 06/22/2021] [Accepted: 06/24/2021] [Indexed: 12/13/2022] Open
Abstract
Amyotrophic Lateral Sclerosis (ALS) is a neurodegenerative disorder with an unknown etiology and no effective treatment, and is characterized by large phenotypic heterogeneity, including variable sites, ages of symptom onset and rates of disease progression. Increasing data support the role of the microbiota-immunity axis in the pathogenesis of neurodegenerative diseases. In the present study, we compared the inflammatory and microbiota profile of ALS patients with different clinical characteristics, with healthy family caregivers. Measuring a panel of 30 inflammatory cytokines in serum and fecal samples, we observed a distinct cytokine profile both at the systemic and intestinal level in patients compared to controls and even in patients with different clinical phenotypes and progression rates. The 16S targeted metagenome analysis revealed slight differences in patients compared to controls as well as in patients with slow progression, marked by the reduction of butyrate-producing bacteria and a decrease of the Firmicutes/Bacteroidetes ratio in ALS. Finally, the short chain fatty acid analysis did not show a different distribution among the groups. If confirmed in a larger number of patients, the inflammatory cytokine profile and the microbial composition could be appropriate biomarker candidates for deciphering ALS heterogeneity.
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Affiliation(s)
- Elena Niccolai
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy; (E.N.); (G.N.); (S.B.); (E.R.)
| | - Vincenzo Di Pilato
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, 16132 Genoa, Italy;
| | - Giulia Nannini
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy; (E.N.); (G.N.); (S.B.); (E.R.)
| | - Simone Baldi
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy; (E.N.); (G.N.); (S.B.); (E.R.)
| | - Edda Russo
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy; (E.N.); (G.N.); (S.B.); (E.R.)
| | - Elisabetta Zucchi
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy;
| | - Ilaria Martinelli
- Neurology Unit, Department of Neuroscience, Azienda Ospedaliero Universitaria di Modena, 41125 Modena, Italy;
| | - Marta Menicatti
- Department of Neurosciences, Psychology, Drug Research and Child Health Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, 50139 Florence, Italy; (M.M.); (G.B.)
| | - Gianluca Bartolucci
- Department of Neurosciences, Psychology, Drug Research and Child Health Section of Pharmaceutical and Nutraceutical Sciences, University of Florence, 50139 Florence, Italy; (M.M.); (G.B.)
| | - Jessica Mandrioli
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy;
- Neurology Unit, Department of Neuroscience, Azienda Ospedaliero Universitaria di Modena, 41125 Modena, Italy;
- Correspondence: (J.M.); (A.A.); Tel.: +39-0593961700 (J.M.); +39-0552758330 (A.A.)
| | - Amedeo Amedei
- Department of Clinical and Experimental Medicine, University of Florence, 50134 Florence, Italy; (E.N.); (G.N.); (S.B.); (E.R.)
- Correspondence: (J.M.); (A.A.); Tel.: +39-0593961700 (J.M.); +39-0552758330 (A.A.)
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Zhang L, He J, Bai L, Ruan S, Yang T, Luo Y. Ribosome-targeting antibacterial agents: Advances, challenges, and opportunities. Med Res Rev 2021; 41:1855-1889. [PMID: 33501747 DOI: 10.1002/med.21780] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 12/08/2020] [Accepted: 12/19/2020] [Indexed: 02/05/2023]
Abstract
Ribosomes, which synthesize proteins, are critical organelles for the survival and growth of bacteria. About 60% of approved antibiotics discovered so far combat pathogenic bacteria by targeting ribosomes. However, several issues, such as drug resistance and toxicity, have impeded the clinical use of ribosome-targeting antibiotics. Moreover, the complexity of the bacteria ribosome structure has retarded the discovery of new ribosome-targeting agents that are considered as the key to the drug-resistance and toxicity. To deal with these challenges, efforts such as medicinal chemistry optimization, combination treatment, and new drug delivery system have been developed. But not enough, the development of structural biology and new screening methods bring powerful tools, such as cryo-electron microscopy technology, advanced computer-aided drug design, and cell-free in vitro transcription/translation systems, for the discovery of novel ribosome-targeting antibiotics. Thus, in this paper, we overview the research on different aspects of bacterial ribosomes, especially focus on discussing the challenges in the discovery of ribosome-targeting antibacterial drugs and advances made to address issues such as drug-resistance and selectivity, which, we believe, provide perspectives for the discovery of novel antibiotics.
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Affiliation(s)
- Laiying Zhang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
| | - Jun He
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
| | - Lang Bai
- Center of Infectious Diseases, State Key Laboratory of Biotherapy, West China Hospital, West China Medical School, Sichuan University and Collaborative Innovation Center, Chengdu, Sichuan, China
| | - Shihua Ruan
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
| | - Tao Yang
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China.,Laboratory of Human Diseases and Immunotherapy, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China.,Institute of Immunology and Inflammation, Frontiers Science Center for Disease-Related Molecular Network, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
| | - Youfu Luo
- State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan, China
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Killingsworth J, Sawmiller D, Shytle RD. Propionate and Alzheimer's Disease. Front Aging Neurosci 2021; 12:580001. [PMID: 33505301 PMCID: PMC7831739 DOI: 10.3389/fnagi.2020.580001] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 12/15/2020] [Indexed: 12/12/2022] Open
Abstract
Propionate, a short-chain fatty acid, serves important roles in the human body. However, our review of the current literature suggests that under certain conditions, excess levels of propionate may play a role in Alzheimer's disease (AD). The cause of the excessive levels of propionate may be related to the Bacteroidetes phylum, which are the primary producers of propionate in the human gut. Studies have shown that the relative abundance of the Bacteroidetes phylum is significantly increased in older adults. Other studies have shown that levels of the Bacteroidetes phylum are increased in persons with AD. Studies on the diet, medication use, and propionate metabolism offer additional potential causes. There are many different mechanisms by which excess levels of propionate may lead to AD, such as hyperammonemia. These mechanisms offer potential points for intervention.
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Affiliation(s)
- Jessica Killingsworth
- Department of Neurosurgery and Brain Repair, Morsani College of Medicine, University of South Florida, Tampa, FL, United States
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Hao C, Gao Z, Liu X, Rong Z, Jia J, Kang K, Guo W, Li J. Intravenous administration of sodium propionate induces antidepressant or prodepressant effect in a dose dependent manner. Sci Rep 2020; 10:19917. [PMID: 33199803 PMCID: PMC7670463 DOI: 10.1038/s41598-020-77085-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 10/26/2020] [Indexed: 12/20/2022] Open
Abstract
Propionate has been reported to exert antidepressant effects, but high-dose propionate may induce autism-like symptoms in experimental animals through induction of dysbiosis of neurotransmitters. The bi-directional effects of propionate seem to be dose-dependent. However, due to the pathological discrepancies between depression and autism, conclusions drawn from autism may not be simply transferable to depression. The effect and underlying action mechanisms of high-dose propionate on depression remains undetermined. To investigate the effects of propionate on depression, propionate dose gradients were intravenously administrated to rats exposed to chronic unpredictable mild stress (CUMS) for 1 week. Results of these behavioral tests demonstrate that low-dose propionate (2 mg/kg body weight/day) induces antidepressant effect through bodyweight recovery, elevated reward-seeking behaviors, and reduced depression-like behaviors, while high-dose propionate (200 mg/kg body weight/day) induces prodepressant effects opposite of those of low-dose propionate. A comprehensive profiling of neurotransmitters in the hippocampus demonstrated that CUMS induces reduction of NE (Norepinephrine), DA (Dopamine). GABA (γ-aminobutyric acid) was recovered by low-dose propionate, while high-dose propionate exerted more complicated effects on neurotransmitters, including reduction of NE, DA, 5-Hydroxytryptamine and Tryptophan, and increase of GABA, Kynurenine, Homovanillic acid, 3-hydroxyanthranilic acid, 3-hydroxykynurenine, 3,4-dihydroxyphenylacetic acid, and 3-methoxytyramine. The neurotransmitters disturbed by high-dose propionate suggest metabolic disorders in the hippocampus, which were confirmed by the clear group separation in PCA of metabolomic profiling. The results of this study demonstrate the double-edged dose-dependent effects of propionate on depression and suggest potential cumulative toxicity of propionate as a food additive to mood disorders.
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Affiliation(s)
- Chunyan Hao
- School of Chemical and Biological Engineering, Taiyuan University of Science & Technology, Taiyuan, 030021, China
| | - Zefeng Gao
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institutes of Biomedical Sciences, Shanxi University, No. 92, Wucheng Road, Xiaodian District, TaiyuanShanxi, 030006, China
| | - XianJun Liu
- School of Chemical and Biological Engineering, Taiyuan University of Science & Technology, Taiyuan, 030021, China
| | - Zhijiang Rong
- School of Chemical and Biological Engineering, Taiyuan University of Science & Technology, Taiyuan, 030021, China
| | - Jingjing Jia
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Kaiqi Kang
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Weiwei Guo
- School of Life Science, Shanxi University, Taiyuan, 030006, China
| | - Jianguo Li
- Key Laboratory of Chemical Biology and Molecular Engineering of Ministry of Education, Institutes of Biomedical Sciences, Shanxi University, No. 92, Wucheng Road, Xiaodian District, TaiyuanShanxi, 030006, China.
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Intermingling of gut microbiota with brain: Exploring the role of probiotics in battle against depressive disorders. Food Res Int 2020; 137:109489. [PMID: 33233143 DOI: 10.1016/j.foodres.2020.109489] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 06/22/2020] [Accepted: 06/23/2020] [Indexed: 02/07/2023]
Abstract
Depression is a debilitating psychiatric ailment which exerts disastrous effects on one's mental and physical health. Depression is accountable for augmentation of various life-threatening maladies such as neurodegenerative anomalies, cardiovascular diseases and diabetes. Depressive episodes are recurrent, pose a negative impact on life quality, decline life expectancy and enhance suicidal tendencies. Anti-depression chemotherapy displays marked adverse effects and frequent relapses. Thus, newer therapeutic interventions to prevent or combat depression are desperately required. Discovery of gut microbes as our mutualistic partner was made a long time ago and it is surprising that their functions still continue to expand and as of yet many are still to be uncovered. Experimental studies have revealed astonishing role of gut commensals in gut-brain signaling, immune homeostasis and hormonal regulation. Now, it is a well-established fact that gut microbes can alleviate stress or depression associated symptoms by modulating brain functions. Here in, we provide an overview of physiological alleyways involved in cross-talk between gut and brain, part played by probiotics in regulation of these pathways and use of probiotic bacteria as psychobiotics in various mental or depressive disorders.
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