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Borras E, Aksenov AA, Baird M, Novick B, Schivo M, Zamuruyev KO, Pasamontes A, Parry C, Foutouhi S, Venn-Watson S, Weimer BC, Davis CE. Exhaled breath condensate methods adapted from human studies using longitudinal metabolomics for predicting early health alterations in dolphins. Anal Bioanal Chem 2017; 409:6523-6536. [PMID: 29063162 DOI: 10.1007/s00216-017-0581-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2017] [Revised: 07/30/2017] [Accepted: 08/10/2017] [Indexed: 10/18/2022]
Abstract
Monitoring health conditions is essential to detect early asymptomatic stages of a disease. To achieve this, blood, urine and breath samples are commonly used as a routine clinical diagnostic. These samples offer the opportunity to detect specific metabolites related to diseases and provide a better understanding of their development. Although blood samples are commonly used routinely to monitor health, the implementation of a relatively noninvasive technique, such as exhaled breath condensate (EBC) analysis, may further benefit the well-being of both humans and other animals. EBC analysis can be used to track possible physical or biochemical alterations caused by common diseases of the bottlenose dolphin (Tursiops truncatus), such as infections or inflammatory-mediated processes. We have used an untargeted metabolomic method with liquid chromatography-mass spectrometry analysis of EBC samples to determine biomarkers related to disease development. In this study, five dolphins under human care were followed up for 1 year. We collected paired blood, physical examination information, and EBC samples. We then statistically correlated this information to predict specific health alterations. Three dolphins provided promising case study information about biomarkers related to cutaneous infections, respiratory infections, dental disease, or hormonal changes (pregnancy). The use of complementary liquid chromatography platforms, with hydrophilic interaction chromatography and reverse-phased columns, allowed us to detect a wide spectrum of EBC biomarker compounds that could be related to these health alterations. Moreover, these two analytical techniques not only provided complementary metabolite information but in both cases they also provided promising diagnostic information for these health conditions. Graphical abstract Collection of the exhaled condensed breath from a bottlenose dolphin from U.S. Navy Marine Mammal Program (MMP).
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Affiliation(s)
- Eva Borras
- Department of Mechanical and Aerospace Engineering, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Alexander A Aksenov
- Department of Mechanical and Aerospace Engineering, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Mark Baird
- Translational Medicine and Research Program, National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, CA, 92106, USA
| | - Brittany Novick
- Translational Medicine and Research Program, National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, CA, 92106, USA
| | - Michael Schivo
- Department of Internal Medicine, Division of Pulmonary and Critical Care Medicine, University of California, Davis, Sacramento, CA, 95617, USA
- Center for Comparative Respiratory Biology and Medicine, University of California, Davis, Davis, CA, 95616, USA
| | - Konstantin O Zamuruyev
- Department of Mechanical and Aerospace Engineering, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Alberto Pasamontes
- Department of Mechanical and Aerospace Engineering, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA
| | - Celeste Parry
- Translational Medicine and Research Program, National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, CA, 92106, USA
| | - Soraya Foutouhi
- School of Veterinary Medicine, University of California, Davis, 1089 Veterinary Medicine Drive, Davis, CA, 95616, USA
| | - Stephanie Venn-Watson
- Translational Medicine and Research Program, National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, CA, 92106, USA
| | - Bart C Weimer
- School of Veterinary Medicine, University of California, Davis, 1089 Veterinary Medicine Drive, Davis, CA, 95616, USA
| | - Cristina E Davis
- Department of Mechanical and Aerospace Engineering, University of California, Davis, One Shields Avenue, Davis, CA, 95616, USA.
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2
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Pasamontes A, Aksenov AA, Schivo M, Rowles T, Smith CR, Schwacke LH, Wells RS, Yeates L, Venn-Watson S, Davis CE. Noninvasive Respiratory Metabolite Analysis Associated with Clinical Disease in Cetaceans: A Deepwater Horizon Oil Spill Study. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:5737-5746. [PMID: 28406294 DOI: 10.1021/acs.est.6b06482] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Health assessments of wild cetaceans can be challenging due to the difficulty of gaining access to conventional diagnostic matrices of blood, serum and others. While the noninvasive detection of metabolites in exhaled breath could potentially help to address this problem, there exists a knowledge gap regarding associations between known disease states and breath metabolite profiles in cetaceans. This technology was applied to the largest marine oil spill in U.S. history (The 2010 Deepwater Horizon oil spill in the Gulf of Mexico). An accurate analysis was performed to test for associations between the exhaled breath metabolome and sonographic lung abnormalities as well as hematological, serum biochemical, and endocrine hormone parameters. Importantly, metabolites consistent with chronic inflammation, such as products of lung epithelial cellular breakdown and arachidonic acid cascade metabolites were associated with sonographic evidence of lung consolidation. Exhaled breath condensate (EBC) metabolite profiles also correlated with serum hormone concentrations (cortisol and aldosterone), hepatobiliary enzyme levels, white blood cell counts, and iron homeostasis. The correlations among breath metabolites and conventional health measures suggest potential application of breath sampling for remotely assessing health of wild cetaceans. This methodology may hold promise for large cetaceans in the wild for which routine collection of blood and respiratory anomalies are not currently feasible.
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Affiliation(s)
- Alberto Pasamontes
- Mechanical and Aerospace Engineering, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Alexander A Aksenov
- Mechanical and Aerospace Engineering, University of California , One Shields Avenue, Davis, California 95616, United States
| | - Michael Schivo
- Department of Internal Medicine, University of California , 4150 V Street, Suite 3400, Sacramento, California 95817, United States
- Center for Comparative Respiratory Biology and Medicine, University of California , Davis, California 95616, United States
| | - Teri Rowles
- Office of Protected Resources, National Marine Fisheries Service, National Oceanic and Atmospheric Administration, 1315 East West Highway, Silver Spring, Maryland 20910, United States
| | - Cynthia R Smith
- National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, California 92106, United States
| | - Lori H Schwacke
- National Centers for Coastal Ocean Science, National Oceanic and Atmospheric Administration, 331 Fort Johnson Road, Charleston, South Carolina 29412, United States
| | - Randall S Wells
- Chicago Zoological Society's Sarasota Dolphin Research Program, c/o Mote Marine Laboratory, 1600 Ken Thompson Parkway, Sarasota, Florida 34236, United States
| | - Laura Yeates
- National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, California 92106, United States
| | - Stephanie Venn-Watson
- National Marine Mammal Foundation, 2240 Shelter Island Drive, Suite 200, San Diego, California 92106, United States
| | - Cristina E Davis
- Mechanical and Aerospace Engineering, University of California , One Shields Avenue, Davis, California 95616, United States
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3
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Guo Y, Ma J, Lu W, He J, Zhang R, Yuan J, Chen W. Associations of Exhaled Carbon Monoxide and Fractional Exhaled Nitric Oxide with Metabolic Syndrome: A Cohort Study. Sci Rep 2016; 6:24532. [PMID: 27076211 PMCID: PMC4830973 DOI: 10.1038/srep24532] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2016] [Accepted: 03/30/2016] [Indexed: 01/06/2023] Open
Abstract
Exhaled carbon monoxide (eCO) and fractional exhaled nitric oxide (FeNO) could reflect underlying inflammatory and oxidative stresses, which play important roles in pathogenetic pathways of metabolic syndrome (MetS). However, epidemiologic evidence was limited. We conducted a study in Wuhan-Zhuhai (WHZH) cohort of 3649 community participants to investigate the association between eCO, FeNO and MetS in both cross-sectional and prospective ways. The results showed that higher eCO and FeNO were associated cross-sectionally with a higher prevalence of MetS. The multivariable-adjusted odds ratios for MetS at baseline were 1.22 (95% confidence interval [CI]: 1.11 to 1.35) associated with per log eCO and 1.14 (95% CI: 1.00 to 1.30) associated with per log FeNO. During a follow-up of 3 years, 358/2181 new developed MetS cases were identified. Compared with lowest quartile of eCO and FeNO, the multivariable-adjusted risk ratios (95% CI) for MetS were 1.48 (1.06 to 2.06) related to the highest quartile of eCO. These findings remained consistent across sex but not smoking status, eCO was only associated with MetS in non-smokers when stratified by smoking status. In conclusion, our study demonstrated that eCO and FeNO were independently and positively associated with the prevalence of MetS cross-sectionally, while only eCO was positively related with the incidence of MetS prospectively.
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Affiliation(s)
- Yanjun Guo
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jixuan Ma
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Wei Lu
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jintong He
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Runbo Zhang
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Jing Yuan
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Weihong Chen
- Department of Occupational and Environmental Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Key Laboratory of Environment and Health in Ministry of Education &Ministry of Environmental Protection, State Key Laboratory of Environmental Health (Incubating), School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
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Broza YY, Mochalski P, Ruzsanyi V, Amann A, Haick H. Hybrid volatolomics and disease detection. Angew Chem Int Ed Engl 2015; 54:11036-48. [PMID: 26235374 DOI: 10.1002/anie.201500153] [Citation(s) in RCA: 158] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Indexed: 02/06/2023]
Abstract
This Review presents a concise, but not exhaustive, didactic overview of some of the main concepts and approaches related to "volatolomics"-an emerging frontier for fast, risk-free, and potentially inexpensive diagnostics. It attempts to review the source and characteristics of volatolomics through the so-called volatile organic compounds (VOCs) emanating from cells and their microenvironment. It also reviews the existence of VOCs in several bodily fluids, including the cellular environment, blood, breath, skin, feces, urine, and saliva. Finally, the usefulness of volatolomics for diagnosis from a single bodily fluid, as well as ways to improve these diagnostic aspects by "hybrid" approaches that combine VOC profiles collected from two or more bodily fluids, will be discussed. The perspectives of this approach in developing the field of diagnostics to a new level are highlighted.
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Affiliation(s)
- Yoav Y Broza
- The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003 (Israel)
| | - Pawel Mochalski
- Breath Research Institute and University-Clinic for Anesthesia, The University of Innsbruck and Innsbruck Medical University, Innsbruck (Austria)
| | - Vera Ruzsanyi
- Breath Research Institute and University-Clinic for Anesthesia, The University of Innsbruck and Innsbruck Medical University, Innsbruck (Austria)
| | - Anton Amann
- Breath Research Institute and University-Clinic for Anesthesia, The University of Innsbruck and Innsbruck Medical University, Innsbruck (Austria)
| | - Hossam Haick
- The Department of Chemical Engineering and Russell Berrie Nanotechnology Institute, Technion-Israel Institute of Technology, Haifa 3200003 (Israel).
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5
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Broza YY, Mochalski P, Ruzsanyi V, Amann A, Haick H. Hybride Volatolomik und der Nachweis von Krankheiten. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201500153] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Wronska A, Kurkowska-Jastrzebska I, Santulli G. Application of microRNAs in diagnosis and treatment of cardiovascular disease. Acta Physiol (Oxf) 2015; 213:60-83. [PMID: 25362848 DOI: 10.1111/apha.12416] [Citation(s) in RCA: 124] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2014] [Revised: 10/08/2014] [Accepted: 10/24/2014] [Indexed: 12/13/2022]
Abstract
Cardiovascular disease (CVD) is a major cause of morbidity and mortality worldwide. Innovative, more stringent diagnostic and prognostic biomarkers and effective treatment options are needed to lessen its burden. In recent years, microRNAs have emerged as master regulators of gene expression - they bind to complementary sequences within the mRNAs of their target genes and inhibit their expression by either mRNA degradation or translational repression. microRNAs have been implicated in all major cellular processes, including cell cycle, differentiation and metabolism. Their unique mode of action, fine-tuning gene expression rather than turning genes on/off, and their ability to simultaneously regulate multiple elements of relevant pathways makes them enticing potential biomarkers and therapeutic targets. Indeed, cardiovascular patients have specific patterns of circulating microRNA levels, often early in the disease process. This article provides a systematic overview of the role of microRNAs in the pathophysiology, diagnosis and treatment of CVD.
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Affiliation(s)
- A. Wronska
- Helen and Clyde Wu Center for Molecular Cardiology; Department of Physiology and Cellular Biophysics; College of Physicians and Surgeons of Columbia University; New York NY USA
| | - I. Kurkowska-Jastrzebska
- Department of Experimental and Clinical Pharmacology; Medical University of Warsaw; Warsaw Poland
- 2nd Department of Neurology; National Institute of Psychiatry and Neurology; Warsaw Poland
| | - G. Santulli
- Helen and Clyde Wu Center for Molecular Cardiology; Department of Physiology and Cellular Biophysics; College of Physicians and Surgeons of Columbia University; New York NY USA
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7
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Aksenov AA, Yeates L, Pasamontes A, Siebe C, Zrodnikov Y, Simmons J, McCartney MM, Deplanque JP, Wells RS, Davis CE. Metabolite content profiling of bottlenose dolphin exhaled breath. Anal Chem 2014; 86:10616-24. [PMID: 25254551 PMCID: PMC4221874 DOI: 10.1021/ac5024217] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
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Changing ocean health and the potential
impact on marine mammal
health are gaining global attention. Direct health assessments of
wild marine mammals, however, is inherently difficult. Breath analysis
metabolomics is a very attractive assessment tool due to its noninvasive
nature, but it is analytically challenging. It has never been attempted
in cetaceans for comprehensive metabolite profiling. We have developed
a method to reproducibly sample breath from small cetaceans, specifically
Atlantic bottlenose dolphins (Tursiops truncatus).
We describe the analysis workflow to profile exhaled breath metabolites
and provide here a first library of volatile and nonvolatile compounds
in cetacean exhaled breath. The described analytical methodology enabled
us to document baseline compounds in exhaled breath of healthy animals
and to study changes in metabolic content of dolphin breath with regard
to a variety of factors. The method of breath analysis may provide
a very valuable tool in future wildlife conservation efforts as well
as deepen our understanding of marine mammals biology and physiology.
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Affiliation(s)
- Alexander A Aksenov
- Mechanical and Aerospace Engineering, University of California , Davis, California 95616, United States
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Brocato J, Sun H, Shamy M, Kluz T, Alghamdi MA, Khoder MI, Chen LC, Costa M. Particulate matter from Saudi Arabia induces genes involved in inflammation, metabolic syndrome and atherosclerosis. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2014; 77:751-66. [PMID: 24839929 PMCID: PMC4233653 DOI: 10.1080/15287394.2014.892446] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
Airborne particulate matter (PM) exposure is a major environmental health concern and is linked to metabolic disorders, such as cardiovascular diseases (CVD) and diabetes, which are on the rise in the Kingdom of Saudi Arabia. This study investigated changes in mouse lung gene expression produced by administration of PM10 collected from Jeddah, Saudi Arabia. FVB/N mice were exposed to 100 μg PM10 or water by aspiration and euthanized 24 h later. The bronchoalveolar lavage fluid (BALF) was collected and analyzed for neutrophil concentration and tumor necrosis factor (TNF)-α and interleukin (IL)-6 levels. RNA was extracted from lungs and whole transcript was analyzed using Affymetrix Mouse Gene 1.0 ST Array. Mice exposed to PM10 displayed an increase in neutrophil concentration and elevated TNF-α and IL-6 levels. Gene expression analysis revealed that mice exposed to PM10 displayed 202 genes that were significantly upregulated and 40 genes that were significantly downregulated. PM10 induced genes involved in inflammation, cholesterol and lipid metabolism, and atherosclerosis. This is the first study to demonstrate that Saudi Arabia PM10 increases in vivo expression of genes located in pathways associated with diseases involving metabolic syndrome and atherosclerosis.
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Affiliation(s)
- Jason Brocato
- Department of Environmental Medicine, NYU School of Medicine, NY, NY, 10016 USA
| | - Hong Sun
- Department of Environmental Medicine, NYU School of Medicine, NY, NY, 10016 USA
| | - Magdy Shamy
- Department of Environmental Sciences, Faculty of Meteorology, Environmental and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Thomas Kluz
- Department of Environmental Medicine, NYU School of Medicine, NY, NY, 10016 USA
| | - Mansour A. Alghamdi
- Department of Environmental Sciences, Faculty of Meteorology, Environmental and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Mamdouh I. Khoder
- Department of Environmental Sciences, Faculty of Meteorology, Environmental and Arid Land Agriculture, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Lung-Chi Chen
- Department of Environmental Medicine, NYU School of Medicine, NY, NY, 10016 USA
| | - Max Costa
- Department of Environmental Medicine, NYU School of Medicine, NY, NY, 10016 USA
- Corresponding author: Max Costa, 57 Old Forge Rd., Tuxedo, NY, 10987, Phone number: 845.731.3515,
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Venn-Watson S. Dolphins and diabetes: applying one health for breakthrough discoveries. Front Endocrinol (Lausanne) 2014; 5:227. [PMID: 25566195 PMCID: PMC4273662 DOI: 10.3389/fendo.2014.00227] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 12/09/2014] [Indexed: 11/23/2022] Open
Affiliation(s)
- Stephanie Venn-Watson
- Translational Medicine and Research Program, National Marine Mammal Foundation, San Diego, CA, USA
- *Correspondence:
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Ridgway SH. A mini review of dolphin carbohydrate metabolism and suggestions for future research using exhaled air. Front Endocrinol (Lausanne) 2013; 4:152. [PMID: 24379802 PMCID: PMC3863911 DOI: 10.3389/fendo.2013.00152] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Accepted: 10/05/2013] [Indexed: 11/13/2022] Open
Abstract
In the 1960s, I explored some aspects of carbohydrate metabolism in healthy bottlenose dolphins (Tursiops truncatus). Their physiological picture resembled what had been described for hyperthyroid diabetics. Dolphins have elevated thyroid hormone turnover, and fasting dolphins maintain a relatively high level of plasma glucose. After dolphins ingest glucose, plasma levels remain high for many hours. Interestingly, plasma glucose must exceed 300 mg/dL (about twice as high as the human threshold) before glucose appears in urine. Due to their diabetes-like states, trainability, and unique natural respiratory anatomy and physiology, dolphins may offer useful clues to metabolites in the breath that may be used to non-invasively monitor diabetes in humans. Dolphins take very rapid and deep breaths that are four or five times as deep as humans and other terrestrial mammals, making them ideal for physiological assessment using non-invasive exhaled air. Avenues for successfully identifying breath-based markers for metabolic disease and physiology in dolphins can be done with both modern technology and the evolutionarily advantageous canine nose. This review summarizes aspects of dolphin metabolism previously learned and offers new directions for diabetes research that may benefit both dolphin and human health.
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Affiliation(s)
- Sam H. Ridgway
- National Marine Mammal Foundation, San Diego, CA, USA
- U.S. Navy Marine Mammal Program, Space and Naval Warfare Systems Center Pacific, San Diego, CA, USA
- *Correspondence: Sam H. Ridgway, National Marine Mammal Foundation, 2240 Shelter Island Blvd., San Diego, CA 92106, USA e-mail:
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