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Wang J, Wang D, Setrerrahmane S, Martinez J, Xu HM. The peptide Acein promotes dopamine secretion through clec-126 to extend the lifespan of elderly C. elegans. Aging (Albany NY) 2023; 15:14651-14665. [PMID: 38154108 PMCID: PMC10781461 DOI: 10.18632/aging.205150] [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: 05/08/2023] [Accepted: 09/08/2023] [Indexed: 12/30/2023]
Abstract
Dopamine plays a crucial role in regulating brain activity and movement and modulating human behavior, cognition and mood. Regulating dopamine signaling may improve cognitive abilities and physical functions during aging. Acein, a nonapeptide of sequence H-Pro-Pro-Thr-Thr-Thr-Lys-Phe-Ala-Ala-OH is able to stimulate dopamine secretion in the brain. By using genetic editing and lifespan investigation in C. elegans, we showed that the lack of the C-type lectin domain-containing protein clec-126 significantly suppressed the aging phenotype and prolonged lifespan, while overexpression of clec-126 promoted aging-related phenotypes and accelerated the aging process. We examined the aging phenotype of C. elegans and showed that Acein could induce a decrease in clec-126 expression, prolonging the lifespan of aged C. elegans. The mechanism proceeds through the Acein-induced stimulation of dopamine secretion that ameliorates motor function decline and extends the healthy lifespan of aged C. elegans. In addition, we also observed an increase in brood number. Our study has shown that Acein regulates dopamine secretion and has good antiaging activity by decreasing clec-126 expression.
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Affiliation(s)
- Jiaqi Wang
- Synthetic Peptide Drug Discovery and Evaluation Engineering Research Center, China Pharmaceutical University, Nanjing 211198, China
| | - Dong Wang
- Synthetic Peptide Drug Discovery and Evaluation Engineering Research Center, China Pharmaceutical University, Nanjing 211198, China
| | | | - Jean Martinez
- Institut des Biomolécules Max Mousseron (IBMM), Université de Montpellier, CNRS, ENSCM, Pôle Chimie Balard Recherche, Montpellier cedex 5 34293, France
| | - Han-Mei Xu
- Synthetic Peptide Drug Discovery and Evaluation Engineering Research Center, China Pharmaceutical University, Nanjing 211198, China
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Morton KS, Hartman JH, Heffernan N, Ryde IT, Kenny-Ganzert IW, Meng L, Sherwood DR, Meyer JN. Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA-induced dopaminergic neurodegeneration. BMC Biol 2023; 21:252. [PMID: 37950228 PMCID: PMC10636816 DOI: 10.1186/s12915-023-01733-9] [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: 05/24/2023] [Accepted: 10/11/2023] [Indexed: 11/12/2023] Open
Abstract
BACKGROUND Diets high in saturated fat and sugar, termed "Western diets," have been associated with several negative health outcomes, including increased risk for neurodegenerative disease. Parkinson's disease (PD) is the second most prevalent neurodegenerative disease and is characterized by the progressive death of dopaminergic neurons in the brain. We build upon previous work characterizing the impact of high-sugar diets in Caenorhabditis elegans to mechanistically evaluate the relationship between high-sugar diets and dopaminergic neurodegeneration. RESULTS Adult high-glucose and high-fructose diets, or exposure from day 1 to 5 of adulthood, led to increased lipid content, shorter lifespan, and decreased reproduction. However, in contrast to previous reports, we found that adult chronic high-glucose and high-fructose diets did not induce dopaminergic neurodegeneration alone and were protective from 6-hydroxydopamine (6-OHDA) induced degeneration. Neither sugar altered baseline electron transport chain function and both increased vulnerability to organism-wide ATP depletion when the electron transport chain was inhibited, arguing against energetic rescue as a basis for neuroprotection. The induction of oxidative stress by 6-OHDA is hypothesized to contribute to its pathology, and high-sugar diets prevented this increase in the soma of the dopaminergic neurons. However, we did not find increased expression of antioxidant enzymes or glutathione levels. Instead, we found evidence suggesting downregulation of the dopamine reuptake transporter dat-1 that could result in decreased 6-OHDA uptake. CONCLUSIONS Our work uncovers a neuroprotective role for high-sugar diets, despite concomitant decreases in lifespan and reproduction. Our results support the broader finding that ATP depletion alone is insufficient to induce dopaminergic neurodegeneration, whereas increased neuronal oxidative stress may drive degeneration. Finally, our work highlights the importance of evaluating lifestyle by toxicant interactions.
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Affiliation(s)
| | - Jessica H Hartman
- Nicholas School of Environment, Duke University, Durham, USA
- Biochemistry and Molecular Biology, Medical University of South Carolina, Charleston, USA
| | | | - Ian T Ryde
- Nicholas School of Environment, Duke University, Durham, USA
| | | | - Lingfeng Meng
- Nicholas School of Environment, Duke University, Durham, USA
| | | | - Joel N Meyer
- Nicholas School of Environment, Duke University, Durham, USA.
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Morton KS, Hartman JS, Heffernan N, Ryde I, Kenny-Ganzert IW, Meng L, Sherwood DR, Meyer JN. Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA induced dopaminergic neurodegeneration. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.29.542737. [PMID: 37398434 PMCID: PMC10312447 DOI: 10.1101/2023.05.29.542737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
BACKGROUND Diets high in saturated fat and sugar, termed western diets, have been associated with several negative health outcomes, including increased risk for neurodegenerative disease. Parkinson s Disease (PD) is the second most prevalent neurodegenerative disease and is characterized by the progressive death of dopaminergic neurons in the brain. We build upon previous work characterizing the impact of high sugar diets in Caenorhabditis elegans to mechanistically evaluate the relationship between high sugar diets and dopaminergic neurodegeneration. RESULTS Non-developmental high glucose and fructose diets led to increased lipid content and shorter lifespan and decreased reproduction. However, in contrast to previous reports, we found that non-developmental chronic high-glucose and high-fructose diets did not induce dopaminergic neurodegeneration alone and were protective from 6-hydroxydopamine (6-OHDA) induced degeneration. Neither sugar altered baseline electron transport chain function, and both increased vulnerability to organism-wide ATP depletion when the electron transport chain was inhibited, arguing against energetic rescue as a basis for neuroprotection. The induction of oxidative stress by 6-OHDA is hypothesized to contribute to its pathology, and high sugar diets prevented this increase in the soma of the dopaminergic neurons. However, we did not find increased expression of antioxidant enzymes or glutathione levels. Instead, we found evidence suggesting alterations to dopamine transmission that could result in decreased 6-OHDA uptake. CONCLUSION Our work uncovers a neuroprotective role for high sugar diets, despite concomitant decreases in lifespan and reproduction. Our results support the broader finding that ATP depletion alone is insufficient to induce dopaminergic neurodegeneration, whereas increased neuronal oxidative stress may drive degeneration. Finally, our work highlights the importance of evaluating lifestyle by toxicant interactions.
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Parrales-Macias V, Michel PP, Tourville A, Raisman-Vozari R, Haïk S, Hunot S, Bizat N, Lannuzel A. The Pesticide Chlordecone Promotes Parkinsonism-like Neurodegeneration with Tau Lesions in Midbrain Cultures and C. elegans Worms. Cells 2023; 12:cells12091336. [PMID: 37174736 PMCID: PMC10177284 DOI: 10.3390/cells12091336] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 04/10/2023] [Accepted: 05/05/2023] [Indexed: 05/15/2023] Open
Abstract
Chlordecone (CLD) is an organochlorine pesticide (OCP) that is currently banned but still contaminates ecosystems in the French Caribbean. Because OCPs are known to increase the risk of Parkinson's disease (PD), we tested whether chronic low-level intoxication with CLD could reproduce certain key characteristics of Parkinsonism-like neurodegeneration. For that, we used culture systems of mouse midbrain dopamine (DA) neurons and glial cells, together with the nematode C. elegans as an in vivo model organism. We established that CLD kills cultured DA neurons in a concentration- and time-dependent manner while exerting no direct proinflammatory effects on glial cells. DA cell loss was not impacted by the degree of maturation of the culture. The use of fluorogenic probes revealed that CLD neurotoxicity was the consequence of oxidative stress-mediated insults and mitochondrial disturbances. In C. elegans worms, CLD exposure caused a progressive loss of DA neurons associated with locomotor deficits secondary to alterations in food perception. L-DOPA, a molecule used for PD treatment, corrected these deficits. Cholinergic and serotoninergic neuronal cells were also affected by CLD in C. elegans, although to a lesser extent than DA neurons. Noticeably, CLD also promoted the phosphorylation of the aggregation-prone protein tau (but not of α-synuclein) both in midbrain cell cultures and in a transgenic C. elegans strain expressing a human form of tau in neurons. In summary, our data suggest that CLD is more likely to promote atypical forms of Parkinsonism characterized by tau pathology than classical synucleinopathy-associated PD.
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Affiliation(s)
- Valeria Parrales-Macias
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Patrick P Michel
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Aurore Tourville
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Rita Raisman-Vozari
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Stéphane Haïk
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Stéphane Hunot
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
| | - Nicolas Bizat
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
- Faculté de Pharmacie de Paris, Université de Paris Cité, 75006 Paris, France
| | - Annie Lannuzel
- Paris Brain Institute-ICM, Inserm, CNRS, Hôpital de la Pitié Salpêtrière, Sorbonne Université, 75013 Paris, France
- Centre Hospitalier Universitaire de la Guadeloupe, Service de Neurologie, Faculté de Médecine de l'Université des Antilles, Centre d'Investigation Clinique (CIC) 1424, 97159 Pointe-à-Pitre, France
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Melnikov K, Kucharíková S, Bárdyová Z, Botek N, Kaiglová A. Applications of a powerful model organism Caenorhabditis elegans to study the neurotoxicity induced by heavy metals and pesticides. Physiol Res 2023; 72:149-166. [PMID: 37159850 PMCID: PMC10226405 DOI: 10.33549/physiolres.934977] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 02/03/2023] [Indexed: 08/27/2023] Open
Abstract
The expansion of industry and the use of pesticides in agriculture represent one of the major causes of environmental contamination. Unfortunately, individuals and animals are exposed to these foreign and often toxic substances on a daily basis. Therefore, it is crucial to monitor the impact of such chemicals on human health. Several in vitro studies have addressed this issue, but it is difficult to explore the impact of these compounds on living organisms. A nematode Caenorhabditis elegans has become a useful alternative to animal models mainly because of its transparent body, fast growth, short life cycle, and easy cultivation. Furthermore, at the molecular level, there are significant similarities between humans and C. elegans. These unique features make it an excellent model to complement mammalian models in toxicology research. Heavy metals and pesticides, which are considered environmental contaminants, are known to have affected the locomotion, feeding behavior, brood size, growth, life span, and cell death of C. elegans. Today, there are increasing numbers of research articles dedicated to this topic, of which we summarized the most recent findings dedicated to the effect of heavy metals, heavy metal mixtures, and pesticides on the well-characterized nervous system of this nematode.
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Affiliation(s)
- K Melnikov
- Department of Laboratory Medicine, Faculty of Health Care and Social Work, University in Trnava, Slovakia.
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Wang Y, Guo K, Wang Q, Zhong G, Zhang W, Jiang Y, Mao X, Li X, Huang Z. Caenorhabditis elegans as an emerging model in food and nutrition research: importance of standardizing base diet. Crit Rev Food Sci Nutr 2022; 64:3167-3185. [PMID: 36200941 DOI: 10.1080/10408398.2022.2130875] [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] [Indexed: 11/03/2022]
Abstract
As a model organism that has helped revolutionize life sciences, Caenorhabditis elegans has been increasingly used in nutrition research. Here we explore the tradeoffs between pros and cons of its use as a dietary model based primarily on literature review from the past decade. We first provide an overview of its experimental strengths as an animal model, focusing on lifespan and healthspan, behavioral and physiological phenotypes, and conservation of key nutritional pathways. We then summarize recent advances of its use in nutritional studies, e.g. food preference and feeding behavior, sugar status and metabolic reprogramming, lifetime and transgenerational nutrition tracking, and diet-microbiota-host interactions, highlighting cutting-edge technologies originated from or developed in C. elegans. We further review current challenges of using C. elegans as a nutritional model, followed by in-depth discussions on potential solutions. In particular, growth scales and throughputs, food uptake mode, and axenic culture of C. elegans are appraised in the context of food research. We also provide perspectives for future development of chemically defined nematode food ("NemaFood") for C. elegans, which is now widely accepted as a versatile and affordable in vivo model and has begun to show transformative potential to pioneer nutrition science.
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Affiliation(s)
- Yuqing Wang
- Institute for Food Nutrition and Human Health, School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
| | - Kaixin Guo
- Institute for Food Nutrition and Human Health, School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- The First Affiliated Hospital of Shenzhen University, Shenzhen, China
| | - Qiangqiang Wang
- Institute for Food Nutrition and Human Health, School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
| | - Guohuan Zhong
- Institute for Food Nutrition and Human Health, School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Center for Bioresources and Drug Discovery, School of Biosciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Wenjun Zhang
- Center for Bioresources and Drug Discovery, School of Biosciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
| | - Yiyi Jiang
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
- Perfect Life & Health Institute, Zhongshan, Guangdong, China
| | - Xinliang Mao
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
- Perfect Life & Health Institute, Zhongshan, Guangdong, China
| | - Xiaomin Li
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
- Perfect Life & Health Institute, Zhongshan, Guangdong, China
| | - Zebo Huang
- Institute for Food Nutrition and Human Health, School of Food Science and Engineering, South China University of Technology, Guangzhou, China
- Guangdong Province Key Laboratory for Biocosmetics, Guangzhou, China
- Center for Bioresources and Drug Discovery, School of Biosciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, China
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de Guzman AV, Kang S, Kim EJ, Kim JH, Jang N, Cho JH, Choi SS. High-Glucose Diet Attenuates the Dopaminergic Neuronal Function in C. elegans, Leading to the Acceleration of the Aging Process. ACS OMEGA 2022; 7:32339-32348. [PMID: 36120016 PMCID: PMC9475632 DOI: 10.1021/acsomega.2c03384] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/15/2022] [Accepted: 08/24/2022] [Indexed: 06/15/2023]
Abstract
Parkinson's disease (PD) is a neurodegenerative disease characterized by the selective degeneration of neurons, primarily in the substantia nigra. Environmental or exogenous factors that cause Parkinson's disease have not been sufficiently elucidated. Our study aims to investigate the causative effect of a high-glucose diet on Parkinson's disease-relevant dopaminergic neuronal system in Caenorhabditis elegans. Aging parameters were first observed by measuring the lifespan, body movement, and body sizes with and without the background of high glucose. The toxic effect of a high-glucose diet was further explored by observing the dopaminergic neurons using transgenic Pdat-1::gfp strains, BZ555, under a Zeiss microscope, and the experiments were extended by assessing dopamine-related behavioral analysis including basal slowing response and alcohol avoidance. The aggregation of the α-synucleins was also assessed by observing the NL5901 mutants. Worms fed with 250 mM glucose showed daf-2-independent regulation of aging, displaying a short lifespan (≤15 days), long body size (max. 140%), and slow movement (min. 30%, 10 bends/min). Anterior dopaminergic neurons were rapidly inactivated (70%) by a glucose-rich diet from 12 h of exposure, suggesting specific degeneration in ADE neurons. The dysregulation of neurons led to deteriorations in dopaminergic behaviors including basal slowing response (BSR). A high-glucose diet decreased dopamine synthesis (40 pg/mg vs 15 pg/mg protein) and induced α-synuclein aggregation in the muscles. Results demonstrate the potential of a high-glucose diet as a trigger of dopaminergic neuronal dysregulation conjugating aging acceleration.
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Affiliation(s)
| | - Seunghun Kang
- Department
of Food and Nutrition, Myongji University, Yongin 17058, South Korea
| | - Eun Ji Kim
- Department
of Food and Nutrition, Myongji University, Yongin 17058, South Korea
| | - Jin Ho Kim
- Department
of Energy Science and Technology, Myongji
University, Yongin 17058, South Korea
| | - Nari Jang
- Department
of Food and Nutrition, Myongji University, Yongin 17058, South Korea
| | - Joong Hee Cho
- Department
of Food and Nutrition, Myongji University, Yongin 17058, South Korea
| | - Shin Sik Choi
- Department
of Energy Science and Technology, Myongji
University, Yongin 17058, South Korea
- Department
of Food and Nutrition, Myongji University, Yongin 17058, South Korea
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You S, Jang M, Kim GH. Mori Cortex radicis extract protected against diet-induced neuronal damage by suppressing the AGE-RAGE/MAPK signaling pathway in C. elegans and mouse model. J Funct Foods 2022. [DOI: 10.1016/j.jff.2022.104996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
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Wu ZQ, Li K, Tian X, Zhou MX, Li ZJ. Schisandra chinensis water extract protects ethanol-induced neurotoxicity in Caenorhabditis elegans. J Food Biochem 2020; 44:e13249. [PMID: 32524635 DOI: 10.1111/jfbc.13249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 03/16/2020] [Accepted: 04/01/2020] [Indexed: 12/12/2022]
Abstract
The protective effect of Schisandra chinensis water extract (SWE) on ethanol-induced neurotoxicity in Caenorhabditis elegans and the underlying mechanism were investigated. Young worms were exposed to ethanol or a mixture of ethanol and SWE for 24 hr. Locomotion ability, tissue ethanol concentration, free radical content, antioxidant enzyme activity, lifespan, and expression of key dopaminergic nervous system-related genes were evaluated. Ethanol affected the motion ability of worms and shortened their lifespan. Ethanol intake increased the tissue ethanol concentration, resulting in redox imbalance, and dopamine release and accumulation. SWE alleviated motility loss of C. elegans and extended their lifespan. It reduced the tissue ethanol concentration and free radical content, likely because it alleviated oxidative stress. Finally, SWE inhibited continuous dopamine excitement. These results suggest that SWE plays a protective role in dopaminergic neurons. It can be used to treat ethanol-induced neurotoxicity, and to investigate its potential mechanism. PRACTICAL APPLICATIONS: Schisandra chinensis is a traditional functional food that has protective effects on the liver and brain. Although S. chinensis is found in some anti-alcohol products, the effects of S. chinensis on neurological and behavioral disorders caused by alcohol are rarely reported. The manuscript explored the protective effect of SWE on ethanol-induced nerve injury in Caenorhabditis elegans, and we preliminarily discussed the underlying mechanism. The results suggested that SWE can alleviate ethanol-induced neurotoxicity. Meanwhile, the results provide a theoretical basis for better use of S. chinensis to develop products to antagonize the side effects of alcohol. In addition, the method of using C. elegans model to evaluate the protective effect of S. chinensis on ethanol-induced nerve injury can provide practical reference for the screening and utilization of other plant functional components.
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Affiliation(s)
- Zhong-Qin Wu
- Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, PR China
| | - Ke Li
- Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, PR China
| | - Xing Tian
- Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, PR China.,Department of Food and Drug Engineering, School of Pharmacy, Hunan University of Chinese Medicine, Changsha, PR China
| | - Ming-Xi Zhou
- Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, PR China
| | - Zong-Jun Li
- Hunan Province Key Laboratory of Food Science and Biotechnology, College of Food Science and Technology, Hunan Agricultural University, Changsha, PR China
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Salim C, Thadathil N, Muralidhara M, Rajini PS. Insights on the age dependent neurodegeneration induced by Monocrotophos, (an organophosphorous insecticide) in Caenorhabditis elegans fed high glucose: Evidence in wild and transgenic strains. Comp Biochem Physiol C Toxicol Pharmacol 2018; 211:15-24. [PMID: 29763691 DOI: 10.1016/j.cbpc.2018.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2018] [Revised: 04/25/2018] [Accepted: 05/08/2018] [Indexed: 12/13/2022]
Abstract
The higher susceptibility of high glucose fed C. elegans to Monocrotophos (MCP, an organophosphorus insecticide) - induced dopaminergic (DA) neuronal degeneration was recently demonstrated. Employing this acute exposure model, the impact of MCP on DA degeneration among worms of two age groups (8 and 13 d old) fed control (CO) and high glucose (GF) diet with specific focus on phenotypic alterations, oxidative impairments and associated molecular perturbations employing both wild (N2) and transgenic strains(BZ555 and NL5901) was investigated. In general, 13 d worms exhibited higher susceptibility to MCP intoxication compared to 8 d old worms. Further, MCP-exposure caused an enhanced degree of DA degeneration among glucose fed (GF) worms as evidenced by lower chemotaxis index, reduced long-term memory and increased nonanone repulsion. Biochemical analysis of 13 d GF worms also revealed a significant increase in ROS, protein carbonyls and reduced ADP/ATP ratio. Interestingly, marked increase in degeneration of dopaminergic neurons and increased in α-synuclein content was evident among 13 d GF worms exposed to MCP. Significant alterations in the mRNA expression levels of daf-2, age-1, sir 2.1 and aak-2 among 13 d GF worms was evident. Collectively these findings suggest that high intake of glucose diet aggravates MCP associated dopaminergic neuronal degeneration and the impact of increasing age under such a condition. Moreover it provides an experimental paradigm to explore the molecular targets and mechanism/s underlying the possible relationship between insecticide exposure-associated dopaminergic degeneration in humans under hyperglycemic conditions.
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Affiliation(s)
- Chinnu Salim
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi, India; Department of Food Protectants and Infestation Control, CSIR-Central Food Technological Research Institute, Mysore 570 020, India
| | - Nidheesh Thadathil
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi, India; Meat and Marine Science Department, CSIR-Central Food Technological Research Institute, Mysore 570 020, India
| | - M Muralidhara
- Department of Biochemistry, CSIR-Central Food Technological Research Institute, Mysore 570 020, India
| | - P S Rajini
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi, India; Department of Food Protectants and Infestation Control, CSIR-Central Food Technological Research Institute, Mysore 570 020, India.
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Metabolic shift from glycogen to trehalose promotes lifespan and healthspan in Caenorhabditis elegans. Proc Natl Acad Sci U S A 2018; 115:E2791-E2800. [PMID: 29511104 DOI: 10.1073/pnas.1714178115] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
As Western diets continue to include an ever-increasing amount of sugar, there has been a rise in obesity and type 2 diabetes. To avoid metabolic diseases, the body must maintain proper metabolism, even on a high-sugar diet. In both humans and Caenorhabditis elegans, excess sugar (glucose) is stored as glycogen. Here, we find that animals increased stored glycogen as they aged, whereas even young adult animals had increased stored glycogen on a high-sugar diet. Decreasing the amount of glycogen storage by modulating the C. elegans glycogen synthase, gsy-1, a key enzyme in glycogen synthesis, can extend lifespan, prolong healthspan, and limit the detrimental effects of a high-sugar diet. Importantly, limiting glycogen storage leads to a metabolic shift whereby glucose is now stored as trehalose. Two additional means to increase trehalose show similar longevity extension. Increased trehalose is entirely dependent on a functional FOXO transcription factor DAF-16 and autophagy to promote lifespan and healthspan extension. Our results reveal that when glucose is stored as glycogen, it is detrimental, whereas, when stored as trehalose, animals live a longer, healthier life if DAF-16 is functional. Taken together, these results demonstrate that trehalose modulation may be an avenue for combatting high-sugar-diet pathology.
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