1
|
Fournier E, Łuszczki E, Isacco L, Chanséaume-Bussiere E, Gryson C, Chambrier C, Drapeau V, Chaput JP, Thivel D. Toward an Integrated Consideration of 24 h Movement Guidelines and Nutritional Recommendations. Nutrients 2023; 15:2109. [PMID: 37432285 DOI: 10.3390/nu15092109] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 04/24/2023] [Accepted: 04/26/2023] [Indexed: 07/12/2023] Open
Abstract
While physical activity, sleep and sedentary behaviors are almost always considered independently, they should be considered as integrated human behaviors. The 24 h Movement approach proposes a concomitant consideration of these behaviors to promote overall health. Not only do these behaviors impact energy expenditure, but they have also been shown to separately impact energy intake, which should be further explored when considering the entire integration of these movement behaviors under the 24 h movement approach. After an evaluation of the prevalence of meeting the 24 h Movement and dietary recommendations, this review summarizes the available evidence (using English publications indexed in PubMed/MEDLINE) regarding the association between the 24 h Movement Guidelines and eating habits. Altogether, the results clearly show the beneficial impact of promoting the 24 h guidelines simultaneously, highlighting that the higher the number of respected movement recommendations, the better eating behaviors in both children and adults. Importantly, our results point out the importance of emphasizing the need to reach sedentary guidelines for better eating habits. Movement and dietary behaviors appear closely related, and giving recommendations on one might impact the other. Combining the 24 h Movement with dietary Guidelines might be more efficient than promoting them separately in public health strategies.
Collapse
Affiliation(s)
- Elora Fournier
- Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), Clermont Auvergne University, CRNH Auvergne, 63000 Clermont-Ferrand, France
| | - Edyta Łuszczki
- Institute of Health Sciences, Medical College of Rzeszów University, 35-310 Rzeszów, Poland
| | - Laurie Isacco
- Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), Clermont Auvergne University, CRNH Auvergne, 63000 Clermont-Ferrand, France
| | | | | | | | - Vicky Drapeau
- Department of Physical Education, Faculty of Education, Université Laval, Quebec, QC G1V 0A6, Canada
| | - Jean-Philippe Chaput
- Healthy Active Living and Obesity Research Group, Children's Hospital of Eastern Ontario Research Institute, Ottawa, ON K1H 5B2, Canada
| | - David Thivel
- Laboratory of the Metabolic Adaptations to Exercise under Physiological and Pathological Conditions (AME2P), Clermont Auvergne University, CRNH Auvergne, 63000 Clermont-Ferrand, France
| |
Collapse
|
2
|
Garcia-Vicencio S, Ratel S, Gryson C, Masgrau A, Piponnier E, Brasy J, Ruyet PL, Bucas M, Barachon N, Visseaux V, Connan Y, Montel F, Lahaye C, Boirie Y, Martin V. A Moderate Supplementation of Native Whey Protein Promotes Better Muscle Training and Recovery Adaptations Than Standard Whey Protein - A 12-Week Electrical Stimulation and Plyometrics Training Study. Front Physiol 2018; 9:1312. [PMID: 30319437 PMCID: PMC6168738 DOI: 10.3389/fphys.2018.01312] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Accepted: 08/30/2018] [Indexed: 12/02/2022] Open
Abstract
The purpose of this study was to assess if native whey protein (NW) supplementation could promote recovery and training adaptations after an electrostimulation (ES) training program combined to plyometrics training. Participants were allocated into three groups, supplemented 5 days/week, either with 15 g of carbohydrates + 15 g of NW (n = 17), 15 g of carbohydrates + 15 g of standard whey protein (SW; n = 15), or placebo (PLA; 30 g of carbohydrates; n = 10), while undergoing a 12-week ES training program of the knee extensors. Concentric power (Pmax) was evaluated before, immediately after, as well as 30 min, 60 min, 24 h, and 48 h after the 1st, 4th and last ES training session. The maximal voluntary contraction torque (MVC), twitch amplitude, anatomical cross-sectional area (CSA) and maximal voluntary activation level (VA) were measured before (T0), and after 6 (T1) and 12 weeks of training (T2). Pmax recovery kinetics differed between groups (p < 0.01). Pmax started to recover at 30 min in NW, 24 h in SW and 48 h in PLA. Training adaptations also differed between groups: MVC increased between T0 and T2 in NW (+11.8%, p < 0.001) and SW (+7.1%, p < 0.05), but not PLA. Nevertheless, the adaptation kinetics differed: MVC increased in NW and SW between T0 and T1, but an additional gain was only observed between T1 and T2 in NW. VA declined at T1 and T2 in PLA (−3.9%, p < 0.05), at T2 in SW (−3.5%, p < 0.05), and was unchanged in NW. CSA increased, but did not differ between groups. These results suggest that NW could promote a faster recovery and neuromuscular adaptations after training than SW. However, the mechanisms underlying this effect remain to be identified.
Collapse
Affiliation(s)
| | - Sébastien Ratel
- AME2P, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| | - Céline Gryson
- AME2P, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| | - Aurélie Masgrau
- AME2P, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| | - Enzo Piponnier
- AME2P, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| | | | | | | | | | | | - Yann Connan
- Lactalis Ingredients USA, Buffalo, NY, United States
| | - Florence Montel
- Clinical Nutrition, Clermont-Ferrand University Hospital, Clermont-Ferrand, France
| | - Clément Lahaye
- Clinical Nutrition, Clermont-Ferrand University Hospital, Clermont-Ferrand, France
| | - Yves Boirie
- Clinical Nutrition, Clermont-Ferrand University Hospital, Clermont-Ferrand, France.,Human Nutrition Unit, INRA, UNH, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| | - Vincent Martin
- AME2P, CRNH Auvergne, University Clermont Auvergne, Clermont-Ferrand, France
| |
Collapse
|
3
|
Martin V, Garcia-Vicencio S, Gryson C, Piponnier E, Brasy J, Bucas M, Visseaux V, Connan Y, Boirie Y, Ratel S. Promoting Training Gains And Recovery With Nutrition. Med Sci Sports Exerc 2017. [DOI: 10.1249/01.mss.0000517055.79274.06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
4
|
Walrand S, Gryson C, Salles J, Giraudet C, Migné C, Bonhomme C, Le Ruyet P, Boirie Y. Fast-digestive protein supplement for ten days overcomes muscle anabolic resistance in healthy elderly men. Clin Nutr 2015; 35:660-8. [PMID: 26008820 DOI: 10.1016/j.clnu.2015.04.020] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2014] [Revised: 04/13/2015] [Accepted: 04/19/2015] [Indexed: 12/25/2022]
Abstract
BACKGROUND/OBJECTIVE Adequate protein intake is crucial to maintain muscle protein content in elderly subjects, but quality of dietary proteins should be considered. The aim was to determine whether soluble milk protein offers an original strategy to increase muscle anabolism in elderly subjects via a synergistic effect of fast-digesting proteins together with a unique essential AA content. DESIGN We investigated the effect of a 10-day adequate-protein (AP) or high-protein (HP) diet together with the protein source as caseins (CAS) or soluble milk proteins (PRO) on specific muscle protein fractional synthesis rates (FSRs) in healthy elderly men (71.8 ± 2.4 yr, n = 31). The isotopic study consisted of two periods of 4 h each: a post-absorptive and a postprandial period. The fed state was defined by consumption of either 15 g or 30 g of PRO or CAS, given fractionally every 20 min for 4 h. Soluble milk proteins are produced using a membrane process directly from pasteurized milk. MEASUREMENTS Specific muscle protein FSRs were measured during both postabsorptive and postprandial period using a continuous infusion of l-[1-(13)C]leucine. RESULTS FSR of sarcoplasmic muscle proteins and actin did not increase significantly in the postprandial state compared to postabsorptive state, whereas myosin FSR rate was increased by feeding whatever the protein source in HP groups (0.024 ± 0.005 vs 0.053 ± 0.011% h(-1), P < 0.05 and 0.026 ± 0.004 vs 0.050 ± 0.005% h(-1), P < 0.004 for PRO HP and CAS HP) but only with the PRO meal in the AP groups (0.031 ± 0.003 vs 0.062 ± 0.009% h(-1), P < 0.03 for PRO AP). Mitochondrial muscle protein FSR was also increased by feeding, irrespective of the protein quantity, but only in PRO meal groups (P < 0.02). CONCLUSION Fast-digesting soluble milk proteins improved postprandial muscle protein synthesis, especially mitochondrial muscle proteins and myosin fractional synthesis rates, in elderly subjects.
Collapse
Affiliation(s)
- Stéphane Walrand
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France
| | - Céline Gryson
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France
| | - Jérôme Salles
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France
| | - Christophe Giraudet
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France
| | - Carole Migné
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France
| | | | | | - Yves Boirie
- INRA, UMR1019, UNH, CRNH Auvergne, F-63000 Clermont-Ferrand, France; Clermont Université, Université d'Auvergne, Unité de Nutrition Humaine, BP 10448, F-63000 Clermont-Ferrand, France; CHU Clermont-Ferrand, Clinical Nutrition Department, Clermont-Ferrand F-63003, France.
| |
Collapse
|
5
|
Gryson C, Walrand S, Giraudet C, Rousset P, Migné C, Bonhomme C, Le Ruyet P, Boirie Y. “Fast proteins” with a unique essential amino acid content as an optimal nutrition in the elderly: Growing evidence. Clin Nutr 2014; 33:642-8. [DOI: 10.1016/j.clnu.2013.09.004] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2013] [Revised: 08/28/2013] [Accepted: 09/04/2013] [Indexed: 11/17/2022]
|
6
|
Ratel S, Gryson C, Rance M, Penando S, Bonhomme C, Le Ruyet P, Duclos M, Boirie Y, Walrand S. Detraining-induced alterations in metabolic and fitness markers after a multicomponent exercise-training program in older men. Appl Physiol Nutr Metab 2012; 37:72-9. [DOI: 10.1139/h11-130] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The aim of the present study was to investigate the effects of a 8-week detraining period after a 16-week multicomponent training program including strength and aerobic exercises on the main determinants of aerobic fitness, muscle strength and some metabolic markers in 24 older subjects (60.2 ± 3.0 years). The oxygen uptake at the second ventilatory threshold (VO2VT2) and at the end of exercise (VO2max), maximum voluntary contraction force (MVC) of knee extensors and some metabolic indexes, i.e., insulin sensitivity, blood lipid profile, inflammatory cytokines, and endothelial function, were evaluated at baseline and after the training and detraining periods. The training program induced significant improvements in VO2VT2 (16%, p < 0.05), VO2max (14%, p < 0.05), MVC (6.5%, p < 0.05), insulin sensitivity (16%, p < 0.05), and endothelial function (p < 0.05) but induced no significant change in lipid profile and inflammatory cytokines. Interestingly, VO2VT2 and VO2max (mL·min–1·kg–1) scores remained significantly above pretraining values after the 8-week detraining period. However, the detraining period reversed MVC values, the insulin sensitivity and endothelial function to baseline levels. To conclude, the 8-week detraining partially reversed the major components of aerobic fitness but totally abolished the gains in muscle strength and some metabolic indexes after a 16-week multicomponent training program in older men. Taken as a whole, the results of this study emphasize the importance of exercise prescriptions for older subjects and the need not to interrupt exercise-training over a prolonged period.
Collapse
Affiliation(s)
- Sébastien Ratel
- Laboratory of Exercise Biology (BAPS, EA 3533), University of Blaise Pascal, UFR STAPS, 63172 Aubière, France
| | - Céline Gryson
- INRA, UMR1019, Unité de Nutrition Humaine, Clermont-Ferrand, F-63001 France
| | - Mélanie Rance
- Laboratory of Exercise Biology (BAPS, EA 3533), University of Blaise Pascal, UFR STAPS, 63172 Aubière, France
| | - Stéphane Penando
- University Hospital (CHU) Clermont-Ferrand, Hospital G. Montpied, Department of Sport Medicine and Functional Explorations, Clermont-Ferrand, F-63003 France
| | | | | | - Martine Duclos
- INRA, UMR1019, Unité de Nutrition Humaine, Clermont-Ferrand, F-63001 France
- University Hospital (CHU) Clermont-Ferrand, Hospital G. Montpied, Department of Sport Medicine and Functional Explorations, Clermont-Ferrand, F-63003 France
| | - Yves Boirie
- INRA, UMR1019, Unité de Nutrition Humaine, Clermont-Ferrand, F-63001 France
| | - Stéphane Walrand
- INRA, UMR1019, Unité de Nutrition Humaine, Clermont-Ferrand, F-63001 France
- Laboratoire de Nutrition Humaine, 58 rue Montalembert – BP321, 63009 Clermont-Ferrand cedex 1, France
| |
Collapse
|
7
|
Gagne A, Chanseaume E, Gryson C, Gerbaud L, Cano N. O64 « Manger rusé », une action de prévention en nutrition innovante à destination du public étudiant. NUTR CLIN METAB 2011. [DOI: 10.1016/s0985-0562(11)70068-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
|
8
|
Chanseaume E, Barquissau V, Salles J, Aucouturier J, Patrac V, Giraudet C, Gryson C, Duché P, Boirie Y, Chardigny JM, Morio B. Muscle mitochondrial oxidative phosphorylation activity, but not content, is altered with abdominal obesity in sedentary men: synergism with changes in insulin sensitivity. J Clin Endocrinol Metab 2010; 95:2948-56. [PMID: 20382691 DOI: 10.1210/jc.2009-1938] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
CONTEXT Abdominal obesity is a major risk factor for muscle insulin resistance. Mitochondria may play a key role in this etiology. OBJECTIVE Changes in muscle mitochondrial content and function were examined according to abdominal obesity and insulin sensitivity in men. STUDY DESIGN AND SETTING The descriptive MitHyCal study was conducted on the general population of Clermont-Ferrand, France. PARTICIPANTS Forty-two healthy sedentary men (41.7 +/- 4.3 yr) were divided into four groups according to waist circumference: 87 cm or less (group 1, n = 10); 88-93 cm (group 2, n = 12); 94-101 cm (group 3, n = 10); and 102 cm or greater (group 4, n = 10). INTERVENTION Plasma metabolic check-up was performed, and insulin sensitivity index was calculated from glucose and insulin responses to a 3-h oral glucose tolerance test. Muscle biopsies were obtained to assess mitochondrial content, oxidative phosphorylation activity, and superoxide anion (reactive oxygen species) production. MAIN OUTCOME MEASURES Assessment of muscle mitochondrial content and function was planned before data collection began. RESULTS Abdominal obesity was negatively correlated to insulin sensitivity index (r = -0.39; P < 0.01), and only group 4 was insulin-resistant (P < 0.05). There were no between-group differences in muscle mitochondrial content and maximal activity of key oxidative enzymes. In contrast, muscle mitochondrial ADP-stimulated respiration rate was 24% higher in groups 2 and 3 compared to groups 1 and 4 (P < 0.05). Mitochondrial ATP and reactive oxygen species production rates were 27 and 48% lower in group 4 than in group 1 (P < 0.05). CONCLUSION Abdominal obesity is associated with alterations in intrinsic muscle mitochondrial function but not content. These adaptations mainly result in reduced mitochondrial ATP production rate in response to insulin resistance.
Collapse
Affiliation(s)
- Emilie Chanseaume
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1019, Centre de Recherche en Nutrition Humaine Auvergne, F-63000 Clermont-Ferrand, France
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
9
|
Chevalier L, Bos C, Gryson C, Luengo C, Walrand S, Tomé D, Boirie Y, Gaudichon C. High-protein diets differentially modulate protein content and protein synthesis in visceral and peripheral tissues in rats. Nutrition 2009; 25:932-9. [DOI: 10.1016/j.nut.2009.01.013] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2008] [Revised: 12/10/2008] [Accepted: 01/05/2009] [Indexed: 10/20/2022]
|
10
|
Chanseaume E, Giraudet C, Gryson C, Walrand S, Rousset P, Boirie Y, Morio B. Enhanced muscle mixed and mitochondrial protein synthesis rates after a high-fat or high-sucrose diet. Obesity (Silver Spring) 2007; 15:853-9. [PMID: 17426320 DOI: 10.1038/oby.2007.582] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
OBJECTIVE Obesity and insulin resistance are associated with muscle mitochondrial dysfunction, which might be related to impairment of mitochondrial protein synthesis. This study aimed at investigating mixed and mitochondrial protein synthesis in skeletal muscle in response to dietary manipulations. RESEARCH METHODS AND PROCEDURES High-sucrose (SU) and high-fat, high-sucrose (F) diets were provided for 6 weeks to Wistar rats at standard (N) and high (H) energy intakes and compared with controls. Fractional synthesis rates of mixed (FSRPT) and mitochondrial (FSRm) proteins within the oxidative (soleus) and glycolytic (tibialis) muscles were measured using stable isotope flooding dose technique using L-[13C]-valine. Carbonyl content, citrate synthase, and cytochrome c oxidase activities were assayed spectrophotometrically on isolated mitochondria. RESULTS In the soleus, FSRPT was increased by 40% in the NSU and NF groups and by 65% in the HSU and HF groups (p<0.001 vs. control). FSRm was increased with high-fat diets (NF, +16%; HF, +32%; p<0.01). In the tibialis, FSR(PT) was enhanced in all experimental groups (+31% to 37%, p<0.05 vs. control). FSRm was augmented in the NSU, NF, and HF groups (+28% to 32%, p<0.01). Cytochrome c oxidase activity was significantly decreased in all experimental groups in the soleus (p<0.001). DISCUSSION Muscle mixed and mitochondrial protein FSR are enhanced after short-term dietary intervention known to induce insulin resistance and obesity. Adaptations are muscle type specific and may not explain alterations in mitochondrial oxidative capacity but might contribute to maintain mitochondrial functioning.
Collapse
Affiliation(s)
- Emilie Chanseaume
- Lipid and Energy Metabolism Research Unit, Human Nutrition Laboratory, Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1019, Clermont-Ferrand cedex 1, France
| | | | | | | | | | | | | |
Collapse
|
11
|
Bos C, Gryson C, Chevalier L, Walrand S, Luengo C, Tomé D, Gaudichon C, Boirie Y. Myosin, sarcoplasmic and mitochondrial protein synthesis rates in rats adapted to a high protein diet. FASEB J 2006. [DOI: 10.1096/fasebj.20.4.a159-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Cécile Bos
- UMR 914 Nutrition physiology and ingestive behaviorINRA‐INAPG16 rue Claude BernardParis75005France
| | - Céline Gryson
- UMR 1019 Protein‐energy metabolism UnitINRA‐Université d’Auvergne58 rue MontalembertClermont‐Ferrand63009France
| | - Laure Chevalier
- UMR 914 Nutrition physiology and ingestive behaviorINRA‐INAPG16 rue Claude BernardParis75005France
| | - Stéphane Walrand
- UMR 1019 Protein‐energy metabolism UnitINRA‐Université d’Auvergne58 rue MontalembertClermont‐Ferrand63009France
| | - Catherine Luengo
- UMR 914 Nutrition physiology and ingestive behaviorINRA‐INAPG16 rue Claude BernardParis75005France
| | - Daniel Tomé
- UMR 914 Nutrition physiology and ingestive behaviorINRA‐INAPG16 rue Claude BernardParis75005France
| | - Claire Gaudichon
- UMR 914 Nutrition physiology and ingestive behaviorINRA‐INAPG16 rue Claude BernardParis75005France
| | - Yves Boirie
- UMR 1019 Protein‐energy metabolism UnitINRA‐Université d’Auvergne58 rue MontalembertClermont‐Ferrand63009France
| |
Collapse
|
12
|
Allegra S, Deleine C, Michael-Jubely R, Gryson C, Boirie Y, Kantakamalakul W, Vasson MP. Implementation of the EGFP-K562 flow cytometric NK test: Determination of NK cytotoxic activity in healthy elderly volunteers before and after feeding. Cytometry A 2006; 69:992-8. [PMID: 16969797 DOI: 10.1002/cyto.a.20301] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
BACKGROUND Natural Killer (NK) cells are key actors of innate immunity that supervise the organism's cells, and fight against viral infections and cancer development through their cytotoxic activity. This cytotoxic activity is modulated by cytokines and hormones and could be influenced by physiological or pathological conditions. New techniques for measuring NK cytotoxic activity by flow-cytometry have recently been developed, and they correlated strongly with the standard chromium ((51)Cr) release assay. Our aim was to implement a previously published enhanced green fluorescent protein (EGFP)-K562 flow cytometric method and use it to evaluate NK cytotoxic activity under different nutritional conditions. METHODS NK effector cells were isolated from peripheral blood mononuclear cells, and a K562 cell line stably transfected by EGFP was used as target cells. Different analytical parameters, including cell ratios and incubation times, were studied to improve the EGFP-K562 flow cytometric NK test conditions. RESULTS The optimized test was then used to determine the effect of fasting and refeeding on NK cell numbers and activity in a physiological situation. NK cytotoxic activity in fasted conditions (30.4 +/- 4.4%) increased by a factor 1.7 +/- 0.2 (P = 0.0025) in nourished conditions (45.0 +/- 4.6%) in healthy elderly people. CONCLUSION Therefore, this method provides a reliable, reproducible and rapid test for analyzing NK cytotoxicity under various conditions.
Collapse
Affiliation(s)
- Séverine Allegra
- Laboratoire de Biochimie, Biologie Moléculaire et Nutrition EA2416, Faculté de Pharmacie, IFR 79 Santé-Auvergne, CLARA, Université Clermont 1, Clermont-Ferrand, France
| | | | | | | | | | | | | |
Collapse
|
13
|
|