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Lu L, Qin J, Chen J, Yu N, Miyano S, Deng Z, Li C. Recent computational drug repositioning strategies against SARS-CoV-2. Comput Struct Biotechnol J 2022; 20:5713-5728. [PMID: 36277237 PMCID: PMC9575573 DOI: 10.1016/j.csbj.2022.10.017] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [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: 05/05/2022] [Revised: 10/12/2022] [Accepted: 10/12/2022] [Indexed: 11/08/2022] Open
Abstract
We performed a comprehensive review of computational drug repositioning methods applied to COVID-19 based on differing data types including sequence data, expression data, structure data and interaction data. We found that graph theory and neural network were the most used strategies for drug repositioning in the case of COVID-19. Integrating different levels of data may improve the success rate for drug repositioning.
Since COVID-19 emerged in 2019, significant levels of suffering and disruption have been caused on a global scale. Although vaccines have become widely used, the virus has shown its potential for evading immunities or acquiring other novel characteristics. Whether current drug treatments are still effective for people infected with Omicron remains unclear. Due to the long development cycles and high expense requirements of de novo drug development, many researchers have turned to consider drug repositioning in the search to find effective treatments for COVID-19. Here, we review such drug repositioning and combination efforts towards providing better handling. For potential drugs under consideration, aspects of both structure and function require attention, with specific categories of sequence, expression, structure, and interaction, the key parameters for investigation. For different data types, we show the corresponding differing drug repositioning methods that have been exploited. As incorporating drug combinations can increase therapeutic efficacy and reduce toxicity, we also review computational strategies to reveal drug combination potential. Taken together, we found that graph theory and neural network were the most used strategy with high potential towards drug repositioning for COVID-19. Integrating different levels of data may further improve the success rate of drug repositioning.
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Affiliation(s)
- Lu Lu
- Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China,Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Zhejiang University School of Medicine, Hangzhou, China
| | - Jiale Qin
- Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China,Zhejiang Provincial Key Laboratory of Precision Diagnosis and Therapy for Major Gynecological Diseases, Hangzhou, China
| | - Jiandong Chen
- Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China,School of Public Health, Undergraduate School of Zhejiang University, Hangzhou, China
| | - Na Yu
- Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Satoru Miyano
- M&D Data Science Center, Tokyo Medical and Dental University, Tokyo, Japan
| | - Zhenzhong Deng
- Xinhua Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, China,Corresponding authors at: Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China (C. Li).
| | - Chen Li
- Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China,Zhejiang Provincial Key Laboratory of Genetic & Developmental Disorders, Zhejiang University School of Medicine, Hangzhou, China,Alibaba-Zhejiang University Joint Research Center of Future Digital Healthcare, Hangzhou, China,Corresponding authors at: Department of Human Genetics, Department of Ultrasound, Women's Hospital, Zhejiang University School of Medicine, Hangzhou, China (C. Li).
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Oduro PK, Zheng X, Wei J, Yang Y, Wang Y, Zhang H, Liu E, Gao X, Du M, Wang Q. The cGAS-STING signaling in cardiovascular and metabolic diseases: Future novel target option for pharmacotherapy. Acta Pharm Sin B 2022; 12:50-75. [PMID: 35127372 DOI: 10.1016/j.apsb.2021.05.011] [Citation(s) in RCA: 80] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 04/05/2021] [Accepted: 04/15/2021] [Indexed: 12/12/2022] Open
Abstract
The cyclic GMP-AMP synthase (cGAS)-stimulator of interferon genes (STING) signaling exert essential regulatory function in microbial-and onco-immunology through the induction of cytokines, primarily type I interferons. Recently, the aberrant and deranged signaling of the cGAS-STING axis is closely implicated in multiple sterile inflammatory diseases, including heart failure, myocardial infarction, cardiac hypertrophy, nonalcoholic fatty liver diseases, aortic aneurysm and dissection, obesity, etc. This is because of the massive loads of damage-associated molecular patterns (mitochondrial DNA, DNA in extracellular vesicles) liberated from recurrent injury to metabolic cellular organelles and tissues, which are sensed by the pathway. Also, the cGAS-STING pathway crosstalk with essential intracellular homeostasis processes like apoptosis, autophagy, and regulate cellular metabolism. Targeting derailed STING signaling has become necessary for chronic inflammatory diseases. Meanwhile, excessive type I interferons signaling impact on cardiovascular and metabolic health remain entirely elusive. In this review, we summarize the intimate connection between the cGAS-STING pathway and cardiovascular and metabolic disorders. We also discuss some potential small molecule inhibitors for the pathway. This review provides insight to stimulate interest in and support future research into understanding this signaling axis in cardiovascular and metabolic tissues and diseases.
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Key Words
- AA, amino acids
- AAD, aortic aneurysm and dissection
- AKT, protein kinase B
- AMPK, AMP-activated protein kinase
- ATP, adenosine triphosphate
- Ang II, angiotensin II
- CBD, C-binding domain
- CDG, c-di-GMP
- CDNs, cyclic dinucleotides
- CTD, C-terminal domain
- CTT, C-terminal tail
- CVDs, cardiovascular diseases
- Cardiovascular diseases
- Cys, cysteine
- DAMPs, danger-associated molecular patterns
- Damage-associated molecular patterns
- DsbA-L, disulfide-bond A oxidoreductase-like protein
- ER stress
- ER, endoplasmic reticulum
- GTP, guanosine triphosphate
- HAQ, R71H-G230A-R293Q
- HFD, high-fat diet
- ICAM-1, intracellular adhesion molecule 1
- IFN, interferon
- IFN-I, type 1 interferon
- IFNAR, interferon receptors
- IFNIC, interferon-inducible cells
- IKK, IκB kinase
- IL, interleukin
- IRF3, interferon regulatory factor 3
- ISGs, IRF-3-dependent interferon-stimulated genes
- Inflammation
- LBD, ligand-binding pocket
- LPS, lipopolysaccharides
- MI, myocardial infarction
- MLKL, mixed lineage kinase domain-like protein
- MST1, mammalian Ste20-like kinases 1
- Metabolic diseases
- Mitochondria
- NAFLD, nonalcoholic fatty liver disease
- NASH, nonalcoholic steatohepatitis
- NF-κB, nuclear factor-kappa B
- NLRP3, NOD-, LRR- and pyrin domain-containing protein 3
- NO2-FA, nitro-fatty acids
- NTase, nucleotidyltransferase
- PDE3B/4, phosphodiesterase-3B/4
- PKA, protein kinase A
- PPI, protein–protein interface
- Poly: I.C, polyinosinic-polycytidylic acid
- ROS, reactive oxygen species
- SAVI, STING-associated vasculopathy with onset in infancy
- SNPs, single nucleotide polymorphisms
- STIM1, stromal interaction molecule 1
- STING
- STING, stimulator of interferon genes
- Ser, serine
- TAK1, transforming growth factor β-activated kinase 1
- TBK1, TANK-binding kinase 1
- TFAM, mitochondrial transcription factor A
- TLR, Toll-like receptors
- TM, transmembrane
- TNFα, tumor necrosis factor-alpha
- TRAF6, tumor necrosis factor receptor-associated factor 6
- TREX1, three prime repair exonuclease 1
- YAP1, Yes-associated protein 1
- cGAMP, 2′,3′-cyclic GMP–AMP
- cGAS
- cGAS, cyclic GMP–AMP synthase
- dsDNA, double-stranded DNA
- hSTING, human stimulator of interferon genes
- mTOR, mammalian target of rapamycin
- mtDNA, mitochondrial DNA
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Joehnke MS, Jeske S, Ispiryan L, Zannini E, Arendt EK, Bez J, Sørensen JC, Petersen IL. Nutritional and anti-nutritional properties of lentil ( Lens culinaris) protein isolates prepared by pilot-scale processing. Food Chem X 2021; 9:100112. [PMID: 33851134 PMCID: PMC8039371 DOI: 10.1016/j.fochx.2020.100112] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 10/16/2020] [Accepted: 10/31/2020] [Indexed: 12/13/2022]
Abstract
Two lentil protein isolates (LPIs) and a lentil flour (LF) were prepared in pilot-scale. Nutritional and anti-nutritional properties of LPIs were examined in comparison to LF. Total galacto-oligosaccharides (GOS) contents of LPIs were reduced by 58–91%. Trypsin inhibitor activity (TIA) levels of LPIs were reduced by 81–87%. In vitro protein digestibility (IVPD) values of LPIs were improved by 35–53%.
Lentil (Lens culinaris) is a high-protein crop with a promising potential as a plant-based protein source for human nutrition. This study investigated nutritional and anti-nutritional properties of whole seed lentil flour (LF) compared to lentil protein isolates (LPIs) prepared in pilot-scale by isoelectric precipitation (LPI–IEP) and ultrafiltration (LPI–UF). Fermentable oligosaccharides, disaccharides, monosaccharides, and polyols (FODMAPs) profiles showed significant reductions in total galacto-oligosaccharides (GOS) contents by 58% and 91% in LPI–IEP and LPI–UF, respectively, compared to LF. Trypsin inhibitor activity (TIA) levels based on dry protein mass were lowered by 81% in LPI–IEP and 87% in LPI–UF relative to LF. Depending on the stage of digestion, the in vitro protein digestibility (IVPD) of LPIs was improved by 35–53% compared to LF, with both products showing a similar long-term protein digestibility to that of bovine serum albumin (BSA). This work supports the use of purified LPI products as a novel source of high quality protein for food applications.
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Key Words
- AA, amino acids
- ANC(s), anti-nutritional compound(s)
- ANOVA, analysis of variance
- Alternative protein sources
- DH, degree of hydrolysis
- DM, dry matter
- E:S ratios, enzyme:substrate ratios
- FODMAPs
- FODMAPs, fermentable oligo-, di- and monosaccharides, and polyols
- FOS, Fructans and fructo-oligosaccharides
- GOS, galacto-oligosaccharides
- HPAEC-PAD, high performance anion exchange chromatography coupled with pulsed amperometric detection
- IBS, irritable bowel syndrome
- IEP, isoelectric precipitation
- IVPD %, in vitro protein digestibility
- IVPD P %, pepsin digestibility
- IVPD PT % 1+1 h, short-term protein digestibility
- IVPD PT % 1+24 h, long-term protein digestibility
- IVPD PT % 1+3 h, medium-term protein digestibility
- In vitro protein digestibility
- LF(s), lentil flour(s)
- LP, lentil protein(s)
- LPC(s), lentil protein concentrate(s)
- LPI(s), lentil protein isolate(s)
- LPI–IEP, lentil protein isolate prepared by IEP
- LPI–UF, lentil protein isolate prepared by UF
- Lens culinaris
- Lentil flour
- Lentil protein isolates
- MW(s), molecular weight(s)
- OPA, o-phthaldialdehyde
- PD, protein digestibility
- Pilot-scale processing
- RFO, raffinose family oligosaccharides
- TCA, trichloroacetic acid
- TIA, trypsin inhibitor activity
- TIU, trypsin inhibitor unit
- TNBS, trinitrobenzenesulfonic acid
- TU, trypsin activity unit
- Trypsin inhibitor activity
- UF, ultrafiltration
- l–BAPA, N–α–benzoyl–l–arginine–4–nitroanilide
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Affiliation(s)
| | - Stephanie Jeske
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Lilit Ispiryan
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Emanuele Zannini
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Elke K Arendt
- School of Food and Nutritional Sciences, University College Cork, Cork, Ireland.,School of Food and Nutritional Sciences and APC Microbiome Institute Ireland, University College Cork, Ireland
| | - Jürgen Bez
- Fraunhofer-Institut für Verfahrenstechnik und Verpackung, Freising, Germany
| | | | - Iben Lykke Petersen
- Department of Food Science, University of Copenhagen, Frederiksberg, Denmark
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Abstract
Transient receptor potential (TRP) ion channels are common components of mechanosensing pathways, mainly described in mammals and other multicellular organisms. To gain insight into the evolutionary origins of eukaryotic mechanosensory proteins, we investigated the involvement of TRP channels in mechanosensing in a unicellular eukaryotic protist, the dinoflagellate Lingulodinium polyedra. BLASTP analysis of the protein sequences predicted from the L. polyedra transcriptome revealed six sequences with high similarity to human TRPM2, TRPM8, TRPML2, TRPP1, and TRPP2; and characteristic TRP domains were identified in all sequences. In a phylogenetic tree including all mammalian TRP subfamilies and TRP channel sequences from unicellular and multicellular organisms, the L. polyedra sequences grouped with the TRPM, TPPML, and TRPP clades. In pharmacological experiments, we used the intrinsic bioluminescence of L. polyedra as a reporter of mechanoresponsivity. Capsaicin and RN1734, agonists of mammalian TRPV, and arachidonic acid, an agonist of mammalian TRPV, TRPA, TRPM, and Drosophila TRP, all stimulated bioluminescence in L. polyedra. Mechanical stimulation of bioluminescence, but not capsaicin-stimulated bioluminescence, was inhibited by gadolinium (Gd3+), a general inhibitor of mechanosensitive ion channels, and the phospholipase C (PLC) inhibitor U73122. These pharmacological results are consistent with the involvement of TRP-like channels in mechanosensing by L. polyedra. The TRP channels do not appear to be mechanoreceptors but rather are components of the mechanotransduction signaling pathway and may be activated via a PLC-dependent mechanism. The presence and function of TRP channels in a dinoflagellate emphasize the evolutionary conservation of both the channel structures and their functions.
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Key Words
- AA, amino acids
- AMTB hydrochloride, N-(3-Aminopropyl)-2-[(3-methylphenyl)methoxy]-N-(2-thienylmethyl)benzamide hydrochloride
- Ce, Caenorhabditis elegans
- Cr, Chlamydomonas reinhardtii
- DMSO, dimethyl sulfoxide
- Dm, Drosophila melanogaster
- Dr, Danio rerio
- FSW, filtered seawater
- Gd3+, gadolinium
- GsMTx4, Grammostola spatulata mechanotoxin 4
- HC067047, 2-Methyl-1-[3-(4-morpholinyl)propyl]-5-phenyl-N-[3-(trifluoromethyl)phenyl]-1H-pyrrole-3-carboxamide
- HMM, Hidden Markov Model
- Hs, Homo sapiens
- Lp, Lingulodinium polyedra
- ML204, 4-Methyl-2-(1-piperidinyl)-quinoline
- Mb, Monosiga brevicollis
- ORF, open reading frame
- PIP2, Phosphatidylinositol 4,5-bisphosphate
- PLC, phospholipase C
- Pt, Paramecium tetraurelia
- RHC80267, O,O′-[1,6-Hexanediylbis(iminocarbonyl)]dioxime cyclohexanone
- RN1734, 2,4-Dichloro-N-isopropyl-N-(2-isopropylaminoethyl)benzenesulfonamide
- RN1747, 1-(4-Chloro-2-nitrophenyl)sulfonyl-4-benzylpiperazine
- TMHMM, transmembrane helix prediction
- TRP, transient receptor potential channel
- U73122, 1-[6-[((17β)-3-Methoxyestra-1,3,5[10]-trien-17-yl)amino]hexyl]-1H-pyrrole-2,5-dione
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Elghazi L, Blandino-Rosano M, Alejandro E, Cras-Méneur C, Bernal-Mizrachi E. Role of nutrients and mTOR signaling in the regulation of pancreatic progenitors development. Mol Metab 2017; 6:560-573. [PMID: 28580286 PMCID: PMC5444096 DOI: 10.1016/j.molmet.2017.03.010] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Revised: 03/14/2017] [Accepted: 03/22/2017] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE Poor fetal nutrition increases the risk of type 2 diabetes in the offspring at least in part by reduced embryonic β-cell growth and impaired function. However, it is not entirely clear how fetal nutrients and growth factors impact β-cells during development to alter glucose homeostasis and metabolism later in life. The current experiments aimed to test the impact of fetal nutrients and growth factors on endocrine development and how these signals acting on mTOR signaling regulate β-cell mass and glucose homeostasis. METHOD Pancreatic rudiments in culture were used to study the role of glucose, growth factors, and amino acids on β-cell development. The number and proliferation of pancreatic and endocrine progenitor were assessed in the presence or absence of rapamycin. The impact of mTOR signaling in vivo on pancreas development and glucose homeostasis was assessed in models deficient for mTOR or Raptor in Pdx1 expressing pancreatic progenitors. RESULTS We found that amino acid concentrations, and leucine in particular, enhance the number of pancreatic and endocrine progenitors and are essential for growth factor induced proliferation. Rapamycin, an mTORC1 complex inhibitor, reduced the number and proliferation of pancreatic and endocrine progenitors. Mice lacking mTOR in pancreatic progenitors exhibited hyperglycemia in neonates, hypoinsulinemia and pancreatic agenesis/hypoplasia with pancreas rudiments containing ductal structures lacking differentiated acinar and endocrine cells. In addition, loss of mTORC1 by deletion of raptor in pancreatic progenitors reduced pancreas size with reduced number of β-cells. CONCLUSION Together, these results suggest that amino acids concentrations and in particular leucine modulates growth responses of pancreatic and endocrine progenitors and that mTOR signaling is critical for these responses. Inactivation of mTOR and raptor in pancreatic progenitors suggested that alterations in some of the components of this pathway during development could be a cause of pancreatic agenesis/hypoplasia and hyperglycemia.
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Affiliation(s)
- Lynda Elghazi
- University of Michigan in Ann Arbor, Internal Medicine Department, MEND Division, Ann Arbor, MI, USA
| | - Manuel Blandino-Rosano
- University of Miami Miller School of Medicine and Miami VA Health Care System, Division of Endocrinology, Diabetes and Metabolism, Miami, FL, USA
| | - Emilyn Alejandro
- University of Michigan in Ann Arbor, Internal Medicine Department, MEND Division, Ann Arbor, MI, USA
- University of Minnesota, Department of Integrative Biology & Physiology, Minneapolis, MN, USA
| | - Corentin Cras-Méneur
- University of Michigan in Ann Arbor, Internal Medicine Department, MEND Division, Ann Arbor, MI, USA
| | - Ernesto Bernal-Mizrachi
- University of Miami Miller School of Medicine and Miami VA Health Care System, Division of Endocrinology, Diabetes and Metabolism, Miami, FL, USA
- Corresponding author. Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, University of Miami Miller School of Medicine and Miami VA Health Care System, USA. Fax: +1 (305) 243 4039.Department of Internal MedicineDivision of Endocrinology, Diabetes and MetabolismUniversity of Miami Miller School of Medicine and Miami VA Health Care SystemUSA
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Azra MN, Ikhwanuddin M. A review of maturation diets for mud crab genus Scylla broodstock: Present research, problems and future perspective. Saudi J Biol Sci 2015; 23:257-67. [PMID: 26981008 PMCID: PMC4778523 DOI: 10.1016/j.sjbs.2015.03.011] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.8] [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: 12/23/2014] [Revised: 03/09/2015] [Accepted: 03/20/2015] [Indexed: 11/23/2022] Open
Abstract
Study of broodstock maturation diets is important in order to increase the quality of berried females, which indirectly improve the larval quantity in the hatchery production of cultured species. This paper reviewed the studies on the maturation diets for mud crab broodstock, genus Scylla and compared independently to identify their effect on reproductive performance and larval quality. The broodstock is usually caught from the wild and held in the spawning or maturation tank for further use of hatchery seed production. Mud crab broodstock was fed either natural diet, artificial diet or mixed diet. Trash fishes were commonly used as a natural feed for mud crab broodstock; meanwhile artificial diets are from formulated fish meal and various kinds of feed. The results indicated that mud crab broodstock has a high dietary requirement for lipids, fatty acids and protein which are to be used during the maturation and breeding processes. However, the natural diet produce better larval quality compared to the artificial diet. The mixed diet is the better diet which resulted in better reproductive performances such as growth, survival, fecundity and maturation processes. This review also discusses the problems in the previous studies for the potential future research to develop very high quality and cost-effective formulated diet for the enhancement of broodstock and seed production technology. Information from this review can be useful in developing a better quality of crustacean broodstock’s diet for commercial hatchery production.
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Affiliation(s)
- Mohamad N. Azra
- School of Fisheries and Aquaculture Sciences, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
| | - Mhd Ikhwanuddin
- Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, Kuala Terengganu, Terengganu, Malaysia
- Corresponding author at: Institute of Tropical Aquaculture, Universiti Malaysia Terengganu, Mengabang Telipot, 21030 Kuala Terengganu, Terengganu, Malaysia. Tel.: +60 9 6683638; fax: +60 9 6683502.
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de Godoy MR, Beloshapka AN, Carter RA, Fascetti AJ, Yu Z, McIntosh BJ, Swanson KS, Buff PR. Acute changes in blood metabolites and amino acid profile post-exercise in Foxhound dogs fed a high endurance formula. J Nutr Sci 2014; 3:e33. [PMID: 26101602 DOI: 10.1017/jns.2014.46] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Revised: 04/28/2014] [Accepted: 06/05/2014] [Indexed: 11/17/2022] Open
Abstract
Dogs participating in endurance exercise, including herding, hunting and racing have a greater energy requirement and may be more susceptible to nutrient depletion, electrolyte imbalance and metabolic stress. The objective of the present study was to investigate the acute response to unstructured mixed exercise in American Foxhounds fed a nutrient-fortified endurance diet. Thirty-nine adult Foxhound dogs (median age: 5·0, range: 2–10 years and median body weight (BW): 36·4, range: 24·9–49·5 kg) were allotted to a standard performance diet (Control) or nutrient-fortified endurance diet for adult dogs (Test). Dogs were balanced by sex, age, BW and athletic performance between diets. All male dogs were intact, whereas all the female dogs were spayed. After 80 d on diet, blood samples were collected via jugular puncture at baseline (0 h), and at 3 and 25 h post-exercise (mean: 17·7 (sem 0·92) km run over 2–3 h). Plasma taurine concentration and complete amino acid (AA) profile, serum chemistry and creatine kinase were measured. Serum chemistry profile remained within normal ranges throughout the study. A significant (P < 0·05) diet by time interaction was observed for calcium, alkaline phosphatase and most AA. Plasma taurine and most essential AA were increased (P < 0·05) after exercise and remained greater (P < 0·05) in dogs fed the Test diet, including the branched-chain AA (isoleucine, leucine and valine). Creatine kinase increased (P = 0·01) after 3 h and returned to baseline after 25 h post-exercise, but was not altered by diet. These data indicate that dogs undergoing a moderate bout of exercise did not suffer from electrolyte imbalance, and that a nutrient-fortified diet resulted in greater plasma taurine and essential AA concentrations.
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