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Rusnak T, Azarcoya-Barrera J, Makarowski A, Jacobs RL, Richard C. Plant- and Animal-Derived Dietary Sources of Phosphatidylcholine Have Differential Effects on Immune Function in The Context of A High-Fat Diet in Male Wistar Rats. J Nutr 2024:S0022-3166(24)00175-5. [PMID: 38582387 DOI: 10.1016/j.tjnut.2024.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Revised: 03/20/2024] [Accepted: 04/02/2024] [Indexed: 04/08/2024] Open
Abstract
BACKGROUND Phosphatidylcholine (PC) derived from eggs has been shown to beneficially modulate T cell response and intestinal permeability under the context of a high-fat diet. OBJECTIVES The objective of this study was to determine whether there is a differential effect of plant and animal-derived sources of PC on immune function. METHODS Four-week-old male Wistar rats were randomly assigned to consume 1 of 4 diets (n = 10/group) for 12 wk, all containing 1.5 g of total choline/kg of diet but differing in choline forms: 1-Control Low-Fat [CLF, 20% fat, 100% free choline (FC)]; 2-Control High-Fat (CHF, 50% fat, 100% FC); 3-High-Fat Egg-derived PC (EPC, 50% fat, 100% Egg-PC); 4-High-Fat Soy-derived PC (SPC, 50% fat, 100% Soy-PC). Immune cell functions and phenotypes were measured in splenocytes by ex vivo cytokine production after mitogen stimulation and flow cytometry, respectively. RESULTS The SPC diet increased splenocyte IL-2 production after PMA+I stimulation compared with the CHF diet. However, the SPC group had a lower proportion of splenocytes expressing the IL-2 receptor (CD25+, P < 0.05). After PMA+I stimulation, feeding EPC normalized splenocyte production of IL-10 relative to the CLF diet, whereas SPC did not (P < 0.05). In mesenteric lymph node lymphocytes, the SPC diet group produced more IL-2 and TNF-α after PMA+I stimulation than the CHF diet, whereas the EPC diet group did not. CONCLUSIONS Our results suggest that both egg- and soy-derived PC may attenuate high-fat diet-induced T cell dysfunction. However, egg-PC enhances, to a greater extent, IL-10, a cytokine involved in promoting the resolution phase of inflammation, whereas soy-PC appears to elicit a greater effect on gut-associated immune responses.
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Affiliation(s)
- Tianna Rusnak
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Jessy Azarcoya-Barrera
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Alexander Makarowski
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - René L Jacobs
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Caroline Richard
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada.
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Azarcoya-Barrera J, Lewis ED, Field CJ, Goruk S, Makarowski A, Pouliot Y, Jacobs RL, Richard C. The Lipid-Soluble Forms of Choline Enhance Ex Vivo Responses from the Gut-Associated Immune System in Young Female Rat Offspring. J Nutr 2022; 152:2604-2614. [PMID: 36774126 DOI: 10.1093/jn/nxac180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 06/16/2022] [Accepted: 08/10/2022] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND In humans, the development of gut-associated lymphoid tissue (GALT) occurs in the first years of life and can be influenced by diet. OBJECTIVES The objective of this study was to determine the effect of dietary choline on the development of gut-associated lymphoid tissue (GALT). METHODS Three feeding trials were conducted in female Sprague-Dawley rats. Beginning 3 d before parturition (studies 1 and 3) or at day 10 of gestation (study 2), control dams consumed a 100% free choline (FC) diet until the end of the lactation period. In studies 1 and 3, test dams consumed a high-glycerophosphocholine (HGPC) diet [75% glycerophosphocholine (GPC), 12.5% phosphatidylcholine (PC), 12.5% FC] and a 100% PC diet, respectively (both 1 g of choline/kg diet). In study 2, test dams consumed a high-sphingomyelin (SM) and PC (SMPC) diet (34% SM, 37% PC, 17% GPC, 7% FC, 5% phosphocholine) or a 50% PC diet (50% PC, 25% FC, 25% GPC), both 1.7 g of choline/kg diet. Immune cell phenotypes and ex vivo cytokine production by mitogen-stimulated immune cells were measured. RESULTS Feeding of the HGPC diet lowered T-cell IL-2 (44%), IFN-γ (34%), and TNF-α (55%) production in mesenteric lymph nodes (MLNs) compared with control. Feeding both SMPC and 50% PC diets during the lactation and weaning periods increased IL-2 (54%) and TNF-α (46%) production after T-cell stimulation compared with control. There was a lower production of IL-2 (46%), IL-6 (66%), and TNF-α (45%), and a higher production of IL-10 (44%) in both SMPC and 50% PC groups following ovalbumin stimulation compared with control in MLNs. Feeding a diet containing 100% PC increased the production of IFN-γ by 52% after T-cell stimulation compared with control. CONCLUSION Feeding a diet containing a mixture of choline forms with a high content of lipid-soluble forms during both the lactation and weaning periods enhances ex vivo immune responses from the GALT in female Sprague-Dawley offspring.
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Affiliation(s)
- Jessy Azarcoya-Barrera
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Erin D Lewis
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Catherine J Field
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Susan Goruk
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Alexander Makarowski
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Yves Pouliot
- STELA Dairy Research Center, Institute of Nutrition and Functional Foods, Université Laval, Québec, Canada
| | - René L Jacobs
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Caroline Richard
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada.
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Zenobi M, Bollatti J, Lopez A, Barton B, Hixson C, Maunsell F, Thatcher W, Miller-Cushon K, Santos J, Staples C, Nelson C. Effects of maternal choline supplementation on performance and immunity of progeny from birth to weaning. J Dairy Sci 2022; 105:9896-9916. [DOI: 10.3168/jds.2021-21689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 07/13/2022] [Indexed: 11/05/2022]
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Wang H, Zhang N, Fang K, Chang X. 2-Deoxy-D-glucose Alleviates Collagen-Induced Arthritis of Rats and Is Accompanied by Metabolic Regulation of the Spleen and Liver. Front Immunol 2021; 12:713799. [PMID: 34539643 PMCID: PMC8440946 DOI: 10.3389/fimmu.2021.713799] [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: 05/24/2021] [Accepted: 08/16/2021] [Indexed: 12/25/2022] Open
Abstract
Rheumatoid arthritis (RA) is significantly associated with glycolysis. This study used 2-deoxy-D-glucose (2-DG), an inhibitor of glycolysis, to treat rats with collagen-induced arthritis (CIA) and investigate the metabolic regulatory mechanism of glycolysis in the disease. 2-DG significantly alleviated CIA. Metabolomics and transcriptomics, as well as their integrative analysis, detected significant changes in the pathways of bile secretion, cholesterol and linoleic acid metabolism in the plasma, liver and spleen during the CIA process and the opposite changes following 2-DG treatment, whereas the expression of the genes regulating these metabolic pathways were changed only in the spleen. In the rat liver, levels of (S)-5-diphosphomevalonic acid in the terpenoid backbone biosynthesis pathway were significantly decreased during CIA progression and increased following 2-DG treatment, and levels of taurochenodeoxycholic acid in the pentose and glucuronate interconversions pathway showed the opposite results. In the spleen, levels of 3-methoxy-4-hydroxyphenylglycol glucuronide in bile secretion and 12(S)-leukotriene B4 in arachidonic acid metabolism were significantly decreased during CIA progression and increased following 2-DG treatment. The changes in the gene-metabolite network of bile secretion in the spleen correlated with a decreased plasma L-acetylcarnitine level in CIA rats and an increase following 2-DG treatment. Our analysis suggests the involvement of spleen and liver metabolism in CIA under the control of glycolysis.
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Affiliation(s)
- Hongxing Wang
- Medical Research Center of The Affiliated Hospital of Qingdao University, Qingdao, China.,Clinical Laboratory of Qilu Hospital, Shandong University, Jinan, China
| | - Nanyang Zhang
- Medical Research Center of The Affiliated Hospital of Qingdao University, Qingdao, China.,Qingdao Engineering Technology Center For Major Disease Marker, Qingdao, China
| | - Kehua Fang
- Clinical Laboratory of The Affiliated Hospital of Qingdao University, Qingdao, China
| | - Xiaotian Chang
- Medical Research Center of The Affiliated Hospital of Qingdao University, Qingdao, China.,Qingdao Engineering Technology Center For Major Disease Marker, Qingdao, China.,Shandong Provincial Clinical Research Center for Immune Disease and Gout, Qingdao, China
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Azarcoya-Barrera J, Field CJ, Goruk S, Makarowski A, Curtis JM, Pouliot Y, Jacobs RL, Richard C. Buttermilk: an important source of lipid soluble forms of choline that influences the immune system development in Sprague-Dawley rat offspring. Eur J Nutr 2021; 60:2807-2818. [PMID: 33416979 DOI: 10.1007/s00394-020-02462-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Accepted: 12/07/2020] [Indexed: 12/24/2022]
Abstract
PURPOSE To determine the effect of feeding buttermilk-derived choline metabolites on the immune system development in Sprague-Dawley rat pups. METHODS Sprague-Dawley dams were randomized to one of the three diets containing 1.7 g/kg choline: 1-Control (100% free choline (FC)), 2-Buttermilk (BM, 37% phosphatidylcholine (PC), 34% sphingomyelin (SM), 17% glycerophosphocholine (GPC), 7% FC, 5% phosphocholine), and 3-Placebo (PB, 50% PC, 25% FC, 25% GPC) until the end of the lactation period. At weaning, pups continued on the same diet as their mom. Cell phenotypes and cytokine production by mitogen-stimulated splenocytes isolated from 3- and 10-week-old pups were measured. RESULTS At 3 weeks, BM-pups had a higher proportion of cytotoxic T cells (CTL; CD3 + CD8 +) while both BM- and PB-pups had an increased proportion of cells expressing CD28 + , CD86 + and CD27 + (all p > 0.05). Following ConA stimulation, splenocytes from BM- and PB-pups produced more TNF-α and IFN-γ and after LPS stimulation produced more IL-10 and TNF-α (all p > 0.05). Starting at week 6 of age, BM-pups had a higher body weight. At 10 weeks, both the BM- and PB-pups had a higher proportion of CTL expressing CD27 + . After ConA stimulation, splenocytes from BM- and PB-pups produced more IL-2, IFN-γ and IL-6 and more IL-10 after LPS stimulation (all p > 0.05). CONCLUSION The proportion of lipid soluble forms of choline in the diet during lactation and weaning periods influence the immune system development in rat offspring.
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Affiliation(s)
- Jessy Azarcoya-Barrera
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Catherine J Field
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Susan Goruk
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Alexander Makarowski
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Jonathan M Curtis
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Yves Pouliot
- STELA Dairy Research Center, Institute of Nutrition and Functional Foods (INAF), Université Laval, Québec, Canada
| | - René L Jacobs
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada
| | - Caroline Richard
- Department of Agricultural, Food and Nutritional Science, Center for Health Research Innovation, University of Alberta, 4-002G Li Ka Shing, Edmonton, AB, T6G 2E1, Canada.
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Aldana-Hernández P, Azarcoya-Barrera J, van der Veen JN, Leonard KA, Zhao YY, Nelson R, Goruk S, Field CJ, Curtis JM, Richard C, Jacobs RL. Dietary phosphatidylcholine supplementation reduces atherosclerosis in Ldlr -/- male mice 2. J Nutr Biochem 2021; 92:108617. [PMID: 33705949 DOI: 10.1016/j.jnutbio.2021.108617] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 11/10/2020] [Accepted: 02/04/2021] [Indexed: 02/07/2023]
Abstract
Choline is an essential nutrient required for various biological processes. Eggs, dairy, and meat are rich in phosphatidylcholine (PC), whereas cereal and legumes are rich in free choline. Excess dietary choline leads to increase plasma trimethylamine N-oxide (TMAO). Epidemiological studies suggest that plasma TMAO is a biomarker for atherosclerosis and it has been suggested that a lower intake of eggs and meat would reduce choline consumption and thus reduce atherosclerosis development. To investigate whether the form of dietary choline influences atherosclerosis development in Ldlr-/-, we randomly fed Ldlr-/-male mice (aged 8 - 10 wk) one of the three 40% (calories) high fat diets (with 0.5% w/w of cholesterol): Control (0.1% w/w free-choline, CON), choline-supplemented (0.4% free-choline, CS), or PC-supplemented (0.1% free-choline and 0.3% choline from PC, PCS). After 12-wk of dietary intervention, the animals were euthanized and tissues and blood collected. Aortic atherosclerotic plaque area, plasma choline, lipid metabolites, and spleen and peripheral blood cell phenotypes were quantified. Surprisingly, the PCS group had significantly lower atherosclerotic lesions while having 2-fold higher plasma TMAO levels compared with both CON and CS groups (P<0.05). In the fasting state, we found that PCS decreased plasma very low-density lipoprotein-cholesterol (VLDL-C) and apolipoprotein B48 (APOB48), and increased plasma high-density lipoprotein-cholesterol (HDL-C). However, very low-density lipoprotein (VLDL) secretion was not affected by dietary treatment. We observed lower levels of circulating pro-atherogenic chemokines in the PCS group. Our study suggests that increased dietary PC intake does not induce a pro-atherogenic phenotype.
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Affiliation(s)
- Paulina Aldana-Hernández
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Jessy Azarcoya-Barrera
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | | | - Kelly-Ann Leonard
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Yuan-Yuan Zhao
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Randal Nelson
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada
| | - Susan Goruk
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Catherine J Field
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Jonathan M Curtis
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - Caroline Richard
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada
| | - René L Jacobs
- Food and Nutritional Science, Department of Agricultural, University of Alberta, Edmonton, Alberta, Canada; Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada.
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Azarcoya-Barrera J, Goruk S, Lewis ED, Pouliot Y, Curtis JM, Steele R, Wadge E, Field CJ, Jacobs RL, Richard C. Feeding Buttermilk-Derived Choline Forms During Gestation and Lactation Modulates Ex Vivo T-Cell Response in Rat Dams. J Nutr 2020; 150:1958-1965. [PMID: 32271922 DOI: 10.1093/jn/nxaa089] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 02/07/2020] [Accepted: 03/12/2020] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Buttermilk contains a mixture of choline forms; it is high in phosphatidylcholine (PC) and sphingomyelin (SM), which could have an impact on immune system development and function. OBJECTIVES We aimed to determine the effect of feeding buttermilk-derived choline forms during pregnancy and lactation on maternal immune function. METHODS Sprague Dawley dams (n = 8 per diet) were randomly assigned midway through pregnancy (10 d of gestation) to 1 of 3 experimental diets, containing 1.7 g/kg choline: control [100% free choline (FC)]; buttermilk [37% PC, 34% SM, 17% glycerophosphocholine (GPC), 7% FC, 5% phosphocholine]; or placebo (50% PC, 25% FC, 25% GPC). Dams consumed the same diet until the end of the lactation period (21 d after parturition). Cell phenotypes and cytokine production by mitogen-stimulated splenocytes were measured and compared using 1-factor ANOVA test in order to asses the effect of diet on immune fuction of lactating dams (main outcome). RESULTS After ConA stimulation, splenocytes from dams in the buttermilk group produced more IL-2 (30%), TNF-α (30%), and IFN-γ (42%) compared with both the placebo and control diets. Placebo-fed dams had a higher proportion of CD8+ cells expressing CD152+ (22%) in spleen, and splenocytes from dams that were fed the buttermilk and the placebo diets produced about 50% and 53% more IL-10 after LPS and OVA stimulation, respectively, compared with the control group. CONCLUSIONS Feeding buttermilk-derived choline forms during pregnancy and lactation had a beneficial impact on the immune system of Sprague Dawley rat dams, especially on T-cell function.
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Affiliation(s)
- Jessy Azarcoya-Barrera
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Susan Goruk
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Erin D Lewis
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Yves Pouliot
- STELA Dairy Research Center, Institute of Nutrition and Functional Foods (INAF), Université Laval, Québec, Québec, Canada
| | - Jonathan M Curtis
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Reid Steele
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Emily Wadge
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Catherine J Field
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - René L Jacobs
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
| | - Caroline Richard
- Department of Agricultural, Food and Nutritional Science, University of Alberta, Edmonton, Alberta, Canada
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Early-life undernutrition reprograms CD4 + T-cell glycolysis and epigenetics to facilitate asthma. J Allergy Clin Immunol 2019; 143:2038-2051.e12. [PMID: 30654047 DOI: 10.1016/j.jaci.2018.12.999] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 11/28/2018] [Accepted: 12/24/2018] [Indexed: 11/24/2022]
Abstract
BACKGROUND Exposure to early-life undernutrition is closely related to higher risks of adverse immunologic outcomes in adulthood. Although it has been suggested that asthma has its origins in early life, its underlying mechanisms remain largely unknown. OBJECTIVE We characterized the effects of early-life undernutrition on T lymphocytes, which play a pivotal role in immune diseases, and we investigated whether this contributes to susceptibility to asthma in adulthood. METHODS Pregnant mice were fed a protein restriction diet (PRD) to establish an early-life undernutrition model. Naive CD4+ T cells (CD4+CD62LhiCD44-) from offspring were used throughout the study. TH2 differentiation was examined by using fluorescence-activated cell sorting and ELISA under TH2-polarized conditions in vitro and through ovalbumin-induced experimental asthma in vivo. T-cell metabolism was measured with a Seahorse XF96 Analyzer. DNA methylation levels were measured by using bisulfite sequencing. RESULTS PRD CD4+ T cells displayed increased activation and proliferation and were prone to differentiate into TH2 cells both in vitro and in vivo, leading to susceptibility to experimental asthma. Mechanistically, early-life undernutrition upregulated mechanistic target of rapamycin 1-dependent glycolysis and induced conserved noncoding DNA sequence 1 DNA hypomethylation in the TH2 cytokine locus of CD4+ T cells. Glycolysis blockades undermined increased TH2 skewing and alleviated experimental asthma in PRD mice. CONCLUSION Early-life undernutrition induced mechanistic target of rapamycin 1-dependent glycolysis upregulation and TH2 cytokine locus hypomethylation in CD4+ T cells, resulting in increased T-cell activation, proliferation, and TH2 skewing and further susceptibility to experimental asthma.
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Zeisel SH, Klatt KC, Caudill MA. Choline. Adv Nutr 2018; 9:58-60. [PMID: 29438456 PMCID: PMC6008955 DOI: 10.1093/advances/nmx004] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2017] [Revised: 08/16/2017] [Accepted: 10/12/2017] [Indexed: 12/24/2022] Open
Affiliation(s)
- Steven H Zeisel
- UNC Nutrition Research Institute, Department of Nutrition, School of Public Health and School of Medicine, University of North Carolina at Chapel Hill, Kannapolis, NC
| | - Kevin C Klatt
- Division of Nutritional Sciences, Cornell University, Ithaca, NY
| | - Marie A Caudill
- Division of Nutritional Sciences, Cornell University, Ithaca, NY
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