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Kumar A, Bellar A, Mishra S, Sekar J, Welch N, Dasarathy S. L-Isoleucine reverses hyperammonemia-induced myotube mitochondrial dysfunction and post-mitotic senescence. J Nutr Biochem 2024; 123:109498. [PMID: 37871767 PMCID: PMC10841977 DOI: 10.1016/j.jnutbio.2023.109498] [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: 03/12/2023] [Revised: 10/16/2023] [Accepted: 10/19/2023] [Indexed: 10/25/2023]
Abstract
Perturbations in the metabolism of ammonia, a cytotoxic endogenous metabolite, occur in a number of chronic diseases, with consequent hyperammonemia. Increased skeletal muscle ammonia uptake causes metabolic, molecular, and phenotype alterations including cataplerosis of (loss of tricarboxylic acid cycle (TCA) cycle intermediate) α-ketoglutarate (αKG), mitochondrial oxidative dysfunction, and senescence-associated molecular phenotype (SAMP). L-Isoleucine (Ile) is an essential, branched-chain amino acid (BCAA) that simultaneously provides acetyl-CoA as an oxidative substrate and succinyl-CoA for anaplerosis (providing TCA cycle intermediates). Our multiomics analyses in myotubes and skeletal muscle from hyperammonemic mice and human patients with cirrhosis showed perturbations in BCAA transporters and catabolism. We, therefore, determined if Ile reverses hyperammonemia-induced impaired mitochondrial oxidative function and SAMP. Studies were performed in differentiated murine C2C12 myotubes that were early passage, late passage (senescent), or those depleted of LAT1/SLC7A5 and human induced pluripotent stem cell-derived myotubes (hiPSCM). Ile reverses hyperammonemia-induced reduction in the maximum respiratory capacity, complex I, II, and III functions in early passage murine myotubes and hiPSCM. Consistently, low ATP content and impaired global protein synthesis (high energy requiring cellular process) during hyperammonemia are reversed by Ile in murine myotubes and hiPSCM. Lower abundance of critical regulators of protein synthesis in mTORC1 signaling, and increased phosphorylation of eukaryotic initiation factor 2α are also reversed by Ile. Genetic depletion studies showed that Ile responses are independent of the amino acid transporter LAT1/SLC7A5. Our studies show that Ile reverses the hyperammonemia-induced impaired mitochondrial oxidative function, cataplerosis, and SAMP in a LAT1/SLC7A5 transporter-independent manner.
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Affiliation(s)
- Avinash Kumar
- Department of Gastroenterology, Hepatology and Nutrition, All India Institute of Medical Sciences, New Delhi, India
| | - Annette Bellar
- Department of Inflammation and Immunity, Lerner Research Institute, Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Saurabh Mishra
- Department of Inflammation and Immunity, Lerner Research Institute, Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Jinendiran Sekar
- Department of Inflammation and Immunity, Lerner Research Institute, Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Nicole Welch
- Department of Inflammation and Immunity, Lerner Research Institute, Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Srinivasan Dasarathy
- Department of Inflammation and Immunity, Lerner Research Institute, Gastroenterology and Hepatology, Cleveland Clinic, Cleveland, Ohio, USA.
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Serum Sestrin2 Was Lower in Septic Shock Patients with Cardiomyopathy. DISEASE MARKERS 2022; 2022:1390373. [PMID: 36092963 PMCID: PMC9458382 DOI: 10.1155/2022/1390373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/12/2022] [Accepted: 08/02/2022] [Indexed: 11/17/2022]
Abstract
Background To determine the clinical significance of variations in serum sestrin2 protein levels in the development of septic cardiomyopathy in septic shock patients. Methods The serum sestrin2 concentrations of each sample were determined using ELISA in a total of 67 control persons and 188 patients with septic shock. Furthermore, using transthoracic echocardiography, septic shock patients were split into two groups based on whether or not cardiomyopathy had developed, and the differences in each index between the two groups were analyzed. We looked at the relationship between serum sestrin2 levels, norepinephrine dosage, and NTproBNP levels. The influencing variables for the prediction of septic cardiomyopathy linked with the development of septic cardiomyopathy and clinical prognosis in septic cardiomyopathy were determined using multivariate binary logistic regression. Results Assessment of left ventricular systolic function by measurement of LVEF revealed that 61/188 (32.4%) of the 188 patients with septic shock included in the research satisfied the diagnostic criteria for septic cardiomyopathy. (1) Sestrin2 protein levels showed a significant difference between septic shock and healthy controls (p < 0.01). (2) Compared to the group without septic cardiomyopathy, the group with combined septic cardiomyopathy had lower serum sestrin2 protein levels (p < 0.05), lower systolic blood pressure (p < 0.05), and higher plasma NTproBNP levels (p < 0.01) and used greater norepinephrine dosages (p < 0.01). The levels of serum sestrin2 protein revealed a little negative relationship with NTproBNP and norepinephrine dose. However, a binary logistic regression analysis revealed that none of these factors was an independent predictor of septic shock. (3) Age, lactate level, SOFA score, positive bacteremia, and sestrin2 protein were shown to be substantial discrepancies in clinical outcomes in patients with septic cardiomyopathy, becoming variables that impact clinical outcomes. Positive bacteremia (p = 0.031, OR = 5.084), SOFA score (p = 0.021, OR = 1.304), and sestrin2 protein (p = 0.039, OR = 0.897) were revealed to have independent influences in predicting clinical mortality outcome in septic cardiomyopathy using multivariate binary logistic regression. Conclusion High serum sestrin2 levels clearly distinguish septic shock patients from healthy controls, whereas low serum sestrin2 levels are related with cardiac dysfunction to some extent but are not an independent influence factor for septic cardiomyopathy. Low serum sestrin2 levels were shown to be useful in predicting clinical outcome in patients with septic cardiomyopathy.
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Zhao Y, Cholewa J, Shang H, Yang Y, Ding X, Liu S, Xia Z, Zanchi NE, Wang Q. Exercise May Promote Skeletal Muscle Hypertrophy via Enhancing Leucine-Sensing: Preliminary Evidence. Front Physiol 2021; 12:741038. [PMID: 34630161 PMCID: PMC8497892 DOI: 10.3389/fphys.2021.741038] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Accepted: 08/30/2021] [Indexed: 12/28/2022] Open
Abstract
Several studies have indicated a positive effect of exercise (especially resistance exercise) on the mTOR signaling that control muscle protein synthesis and muscle remodeling. However, the relationship between exercise, mTOR activation and leucine-sensing requires further clarification. Two month old Sprague-Dawley rats were subjected to aerobic exercise (treadmill running at 20 m/min, 6° incline for 60 min) and resistance exercise (incremental ladder climbing) for 4 weeks. The gastrocnemius muscles were removed for determination of muscle fibers diameter, cross-sectional area (CSA), protein concentration and proteins involved in muscle leucine-sensing and protein synthesis. The results show that 4 weeks of resistance exercise increased the diameter and CSA of gastrocnemius muscle fibers, protein concentration, the phosphorylation of mTOR (Ser2448), 4E-BP1(Thr37/46), p70S6K (Thr389), and the expression of LeuRS, while aerobic exercise just led to a significant increase in protein concentration and the phosphorylation of 4E-BP1(Thr37/46). Moreover, no difference was found for Sestrin2 expression between groups. The current study shows resistance exercise, but not aerobic exercise, may increase muscle protein synthesis and protein deposition, and induces muscle hypertrophy through LeuRS/mTOR signaling pathway. However, further studies are still warranted to clarify the exact effects of vary intensities and durations of aerobic exercise training.
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Affiliation(s)
- Yan Zhao
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education and Health, Wenzhou University, Wenzhou, China
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education, Jinggangshan University, Ji'an, China
| | - Jason Cholewa
- Department of Exercise Physiology, University of Lynchburg, Lynchburg, VA, United States
| | - Huayu Shang
- School of Sport Medicine and Health, Chengdu Sport University, Chengdu, China
| | - Yueqin Yang
- Hubei Provincial Collaborative Innovation Center for Exercise and Health Promotion, College of Health Science, Wuhan Sports University, Wuhan, China
| | - Xiaomin Ding
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education, Jinggangshan University, Ji'an, China
| | - Shaosheng Liu
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education, Jinggangshan University, Ji'an, China
| | - Zhi Xia
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education and Health, Wenzhou University, Wenzhou, China
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education, Jinggangshan University, Ji'an, China
| | - Nelo Eidy Zanchi
- Department of Physical Education, Federal University of Maranhão (UFMA), São Luís, Brazil
- Laboratory of Skeletal Muscle Biology and Human Strength Performance (LABFORCEH), São Luís, Brazil
| | - Qianjin Wang
- Exercise Physiology and Biochemistry Laboratory, College of Physical Education, Jinggangshan University, Ji'an, China
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Suryawan A, El-Kadi SW, Nguyen HV, Fiorotto ML, Davis TA. Intermittent Bolus Compared With Continuous Feeding Enhances Insulin and Amino Acid Signaling to Translation Initiation in Skeletal Muscle of Neonatal Pigs. J Nutr 2021; 151:2636-2645. [PMID: 34159368 PMCID: PMC8417931 DOI: 10.1093/jn/nxab190] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 05/17/2021] [Accepted: 05/18/2021] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Nutrition administered as intermittent bolus feeds rather than continuously promotes greater protein synthesis rates in skeletal muscle and enhances lean growth in a neonatal piglet model. The molecular mechanisms responsible remain unclear. OBJECTIVES We aimed to identify the insulin- and/or amino acid-signaling components involved in the enhanced stimulation of skeletal muscle by intermittent bolus compared to continuous feeding in neonatal pigs born at term. METHODS Term piglets (2-3 days old) were fed equal amounts of sow milk replacer [12.8 g protein and 155 kcal/(kg body weight · d)] by orogastric tube as intermittent bolus meals every 4 hours (INT) or by continuous infusion (CTS). After 21 days, gastrocnemius muscle samples were collected from CTS, INT-0 (before a meal), and INT-60 (60 minutes after a meal) groups (n = 6/group). Insulin- and amino acid-signaling components relevant to mechanistic target of rapamycin complex (mTORC) 1 activation and protein translation were measured. RESULTS Phosphorylation of the insulin receptor, IRS-1, PDK1, mTORC2, pan-Akt, Akt1, Akt2, and TSC2 was 106% to 273% higher in the skeletal muscle of INT-60 piglets than in INT-0 and CTS piglets (P < 0.05), but phosphorylation of PTEN, PP2A, Akt3, ERK1/2, and AMPK did not differ among groups, nor did abundances of PHLPP, SHIP2, and Ubl4A. The association of GATOR2 with Sestrin1/2, but not CASTOR1, was 51% to 52% lower in INT-60 piglets than in INT-0 and CTS piglets (P < 0.05), but the abundances of SLC7A5/LAT1, SLC38A2/SNAT2, SLC38A9, Lamtor1/2, and V-ATPase did not differ. Associations of mTOR with RagA, RagC, and Rheb and phosphorylation of S6K1 and 4EBP1, but not eIF2α and eEF2, were 101% to 176% higher in INT-60 piglets than in INT-0 and CTS piglets (P < 0.05). CONCLUSIONS The enhanced rates of muscle protein synthesis and growth with intermittent bolus compared to continuous feeding in a neonatal piglet model can be explained by enhanced activation of both the insulin- and amino acid-signaling pathways that regulate translation initiation.
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Affiliation(s)
- Agus Suryawan
- USDA/Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Samer W El-Kadi
- Department of Animal and Poultry Sciences, Virginia Tech, Blacksburg, VA, USA
| | - Hanh V Nguyen
- USDA/Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Marta L Fiorotto
- USDA/Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
| | - Teresa A Davis
- USDA/Agricultural Research Service Children's Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX, USA
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Gillies NA, Milan AM, Chia PHP, Sharma P, Mitchell SM, Zeng N, Ramzan F, D'Souza RF, Mitchell CJ, Knowles SO, Andraos S, Sjödin A, Wagner KH, Roy NC, Cameron-Smith D. Responsiveness of one-carbon metabolites to a high-protein diet in older men: Results from a 10-wk randomized controlled trial. Nutrition 2021; 89:111231. [PMID: 33930787 DOI: 10.1016/j.nut.2021.111231] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2020] [Revised: 01/22/2021] [Accepted: 03/01/2021] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Dietary strategies to promote successful aging are divergent. Higher-protein diets are recommended to preserve skeletal muscle mass and physical function. Conversely, increased B-vitamin intake, supporting one-carbon (1C) metabolism, reduces the risk of cognitive decline and cardiovascular disease. On the hypothesis that higher protein intake through animal-based sources will benefit 1C regulation by the supply of B vitamins (folate, riboflavin, and vitamins B6 and B12) and methyl donors (choline) despite higher methionine intake, this study explored the effect of a higher-protein diet on 1C metabolite status in older men compared to current protein recommendations. METHODS Older men (age, 74 ± 3 y) were randomized to receive a diet for 10 wk containing either the recommended dietary allowance (RDA) of protein (0.8 g/kg body weight/d, n = 14), or double that amount (2RDA, n = 15), with differences in protein accounted for by modifying carbohydrate intake. Intervention diets were matched to each individual's energy requirements based on the Harris-Benedict equation and adjusted fortnightly as required depending on physical activity and satiety. Fasting plasma 1C metabolite concentrations were quantified by liquid chromatography coupled with mass spectrometry at baseline and after 10 wk of intervention. RESULTS Plasma homocysteine concentrations were reduced from baseline to follow-up with both diets. Changes in metabolite ratios reflective of betaine-dependent homocysteine remethylation were specific to the RDA diet, with an increase in the betaine-to-choline ratio and a decrease in the dimethylglycine-to-betaine ratio. Comparatively, increasing folate intake was positively associated with a change in choline concentration and inversely with the betaine-to-choline ratio for the 2RDA group. CONCLUSIONS Adding to the known benefits of higher protein intake in older people, this study supports a reduction of homocysteine with increased consumption of animal-based protein, although the health effects of differential response of choline metabolites to a higher-protein diet remain uncertain.
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Affiliation(s)
- Nicola A Gillies
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Amber M Milan
- Liggins Institute, University of Auckland, Auckland, New Zealand; Food Nutrition & Health, AgResearch Ltd, Palmerston North, New Zealand; The High-Value Nutrition National Science Challenge, Auckland, New Zealand
| | - Pamela H P Chia
- Liggins Institute, University of Auckland, Auckland, New Zealand; Discipline of Nutrition, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Pankaja Sharma
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Sarah M Mitchell
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Nina Zeng
- Liggins Institute, University of Auckland, Auckland, New Zealand; Department of Physiology, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Farha Ramzan
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand
| | - Randall F D'Souza
- Liggins Institute, University of Auckland, Auckland, New Zealand; Discipline of Nutrition, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand; Maurice Wilkins Centre for Molecular Biodiscovery, University of Auckland, Auckland, New Zealand
| | - Cameron J Mitchell
- Liggins Institute, University of Auckland, Auckland, New Zealand; School of Kinesiology, University of British Columbia, Vancouver, British Columbia, Canada
| | - Scott O Knowles
- Food Nutrition & Health, AgResearch Ltd, Palmerston North, New Zealand
| | | | - Anders Sjödin
- Department of Nutrition Exercise and Sports, University of Copenhagen, Copenhagen,Denmark
| | - Karl-Heinz Wagner
- Department of Nutritional Sciences and Research Platform Active Ageing, University of Vienna, Vienna, Austria
| | - Nicole C Roy
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand; Food Nutrition & Health, AgResearch Ltd, Palmerston North, New Zealand; The High-Value Nutrition National Science Challenge, Auckland, New Zealand; Department of Human Nutrition, University of Otago, Dunedin, New Zealand
| | - David Cameron-Smith
- Liggins Institute, University of Auckland, Auckland, New Zealand; Riddet Institute, Massey University, Palmerston North, New Zealand; Singapore Institute for Clinical Sciences, Agency for Science, Technology and Research, Singapore, Sinapore.
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