1
|
Low SA, Nielsen JJ, Coakley CM, Thomas M, Mbachu EU, Chen CL, Jones-Hall Y, Tremblay MI, Hicks JR, Low PS. An engineered dual function peptide to repair fractured bones. J Control Release 2022; 350:688-697. [PMID: 36030992 PMCID: PMC9897200 DOI: 10.1016/j.jconrel.2022.06.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 06/10/2022] [Accepted: 06/12/2022] [Indexed: 02/08/2023]
Abstract
Targeted drug delivery, often referred to as "smart" drug delivery, is a process whereby a therapeutic drug is delivered to specific parts of the body in a manner that increases its concentration at the desired sites relative to others. This approach is poised to revolutionize medicine as exemplified by the recent FDA approval of Cytalux (FDA approves pioneering drug for ovarian cancer surgery - Purdue University News) which is a folate-receptor targeted intraoperative near infrared (NIR) imaging agent that was developed in our laboratories. Fracture-associated morbidities and mortality affect a significant portion of world population. United states, Canada and Europe alone spent $48 billion in treating osteoporosis related fractures although this number doesn't count the economic burden due to loss in productivity. It is estimated that by 2050 ca 21 million hip fractures would occur globally which will be leading cause of premature death and disability. Despite the need for improvement in the treatment for fracture repair, methods for treating fractures have changed little in recent decades. Systemic delivery of fracture-homing bone anabolics holds great promise as a therapeutic strategy in this regard. Here we report the design of a fracture-targeted peptide comprised of a payload that binds and activates the parathyroid hormone receptor (PTHR1) and is linked to a targeting ligand comprised of 20 D-glutamic acids (D-Glu20) that directs accumulation of the payload specifically at fracture sites. This targeted delivery results in reduction of fracture healing times to <1/2 while creating repaired bones that are >2-fold stronger than saline-treated controls in mice. Moreover, this hydroxyapatite-targeted peptide can be administered without detectable toxicity to healthy tissues or modification of healthy bones in dogs. Additionally, since similar results are obtained upon treatment of osteoporotic and diabetic fractures in mice, and pain resolution is simultaneously accelerated by this approach, we conclude that this fracture-targeted anabolic peptide displays significant potential to revolutionize the treatment of bone fractures.
Collapse
Affiliation(s)
- Stewart A Low
- Department of Chemistry, Purdue University, 720 Clinic Drive, West Lafayette, IN 47907, USA.
| | - Jeffery J Nielsen
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, USA
| | | | - Mini Thomas
- Novosteo Inc., 1281 Win Hentschel Blvd, West Lafayette, IN 47906, USA
| | - Ephraim U Mbachu
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
| | - Christopher L Chen
- College of Health and Human Sciences, Purdue University, West Lafayette, IN, USA
| | - Yava Jones-Hall
- Department of Comparative Pathobiology, Purdue University, West Lafayette, IN, USA
| | - Madeleine I Tremblay
- Department of Chemistry, Purdue University, 720 Clinic Drive, West Lafayette, IN 47907, USA
| | - Jonathan R Hicks
- Weldon School of Biomedical Engineering, Purdue University, West Lafayette, IN, USA
| | - Philip S Low
- Department of Chemistry, Purdue University, 720 Clinic Drive, West Lafayette, IN 47907, USA; Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, USA.
| |
Collapse
|
2
|
Nielsen JJ, Low SA, Ramseier NT, Hadap RV, Young NA, Wang M, Low PS. Analysis of the bone fracture targeting properties of osteotropic ligands. J Control Release 2021; 329:570-584. [PMID: 33031877 DOI: 10.1016/j.jconrel.2020.09.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 06/01/2020] [Revised: 09/21/2020] [Accepted: 09/27/2020] [Indexed: 11/29/2022]
Abstract
PURPOSE Although more than 18,000,000 fractures occur each year in the US, methods to promote fracture healing still rely primarily on fracture stabilization, with use of bone anabolic agents to accelerate fracture repair limited to rare occasions when the agent can be applied to the fracture surface. Because management of broken bones could be improved if bone anabolic agents could be continuously applied to a fracture over the entire course of the healing process, we undertook to identify strategies that would allow selective concentration of bone anabolic agents on a fracture surface following systemic administration. Moreover, because hydroxyapatite is uniquely exposed on a broken bone, we searched for molecules that would bind with high affinity and specificity for hydroxyapatite. We envisioned that by conjugating such osteotropic ligands to a bone anabolic agent, we could acquire the ability to continuously stimulate fracture healing. RESULTS Although bisphosphonates and tetracyclines were capable of localizing small amounts of peptidic payloads to fracture surfaces 2-fold over healthy bone, their specificities and capacities for drug delivery were significantly inferior to subsequent other ligands, and were therefore considered no further. In contrast, short oligopeptides of acidic amino acids were found to localize a peptide payload to a bone fracture 91.9 times more than the control untargeted peptide payload. Furthermore acidic oligopeptides were observed to be capable of targeting all classes of peptides, including hydrophobic, neutral, cationic, anionic, short oligopeptides, and long polypeptides. We further found that highly specific bone fracture targeting of multiple peptidic cargoes can be achieved by subcutaneous injection of the construct. CONCLUSIONS Using similar constructs, we anticipate that healing of bone fractures in humans that have relied on immobilization alone can be greately enhanced by continuous stimulation of bone growth using systemic administration of fracture-targeted bone anabolic agents.
Collapse
Affiliation(s)
- Jeffery J Nielsen
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, United States of America
| | - Stewart A Low
- Department of Chemistry, Purdue University, West Lafayette, IN, United States of America
| | - Neal T Ramseier
- Department of Chemistry, Purdue University, West Lafayette, IN, United States of America
| | - Rahul V Hadap
- Department of Chemistry, Purdue University, West Lafayette, IN, United States of America
| | - Nicholas A Young
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, United States of America
| | - Mingding Wang
- Department of Chemistry, Purdue University, West Lafayette, IN, United States of America
| | - Philip S Low
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, United States of America; Department of Chemistry, Purdue University, West Lafayette, IN, United States of America.
| |
Collapse
|
3
|
Abstract
PURPOSE OF REVIEW Compared with the current standard of implanting bone anabolics for fracture repair, bone fracture-targeted anabolics would be more effective, less invasive, and less toxic and would allow for control over what phase of fracture healing is being affected. We therefore sought to identify the optimal bone-targeting molecule to allow for systemic administration of therapeutics to bone fractures. RECENT FINDINGS We found that many bone-targeting molecules exist, but most have been developed for the treatment of bone cancers, osteomyelitis, or osteoporosis. There are a few examples of bone-targeting ligands that have been developed for bone fractures that are selective for the bone fracture over the body and skeleton. Acidic oligopeptides have the ideal half-life, toxicity profile, and selectivity for a bone fracture-targeting ligand and are the most developed and promising of these bone fracture-targeting ligands. However, many other promising ligands have been developed that could be used for bone fractures.
Collapse
Affiliation(s)
- Jeffery J Nielsen
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, 720 Clinic Drive, West Lafayette, IN, 47907, USA.
| | - Stewart A Low
- Novosteo Inc., West Lafayette, IN, USA
- Department of Chemistry, Purdue University, West Lafayette, IN, USA
| |
Collapse
|
4
|
Wagner DR, Karnik S, Gunderson ZJ, Nielsen JJ, Fennimore A, Promer HJ, Lowery JW, Loghmani MT, Low PS, McKinley TO, Kacena MA, Clauss M, Li J. Dysfunctional stem and progenitor cells impair fracture healing with age. World J Stem Cells 2019; 11:281-296. [PMID: 31293713 PMCID: PMC6600851 DOI: 10.4252/wjsc.v11.i6.281] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 04/26/2019] [Accepted: 06/13/2019] [Indexed: 02/06/2023] Open
Abstract
Successful fracture healing requires the simultaneous regeneration of both the bone and vasculature; mesenchymal stem cells (MSCs) are directed to replace the bone tissue, while endothelial progenitor cells (EPCs) form the new vasculature that supplies blood to the fracture site. In the elderly, the healing process is slowed, partly due to decreased regenerative function of these stem and progenitor cells. MSCs from older individuals are impaired with regard to cell number, proliferative capacity, ability to migrate, and osteochondrogenic differentiation potential. The proliferation, migration and function of EPCs are also compromised with advanced age. Although the reasons for cellular dysfunction with age are complex and multidimensional, reduced expression of growth factors, accumulation of oxidative damage from reactive oxygen species, and altered signaling of the Sirtuin-1 pathway are contributing factors to aging at the cellular level of both MSCs and EPCs. Because of these geriatric-specific issues, effective treatment for fracture repair may require new therapeutic techniques to restore cellular function. Some suggested directions for potential treatments include cellular therapies, pharmacological agents, treatments targeting age-related molecular mechanisms, and physical therapeutics. Advanced age is the primary risk factor for a fracture, due to the low bone mass and inferior bone quality associated with aging; a better understanding of the dysfunctional behavior of the aging cell will provide a foundation for new treatments to decrease healing time and reduce the development of complications during the extended recovery from fracture healing in the elderly.
Collapse
Affiliation(s)
- Diane R Wagner
- Department of Mechanical and Energy Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States
| | - Sonali Karnik
- Department of Mechanical and Energy Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States
| | - Zachary J Gunderson
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Jeffery J Nielsen
- Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN 47907, United States
| | - Alanna Fennimore
- Department of Physical Therapy, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States
| | - Hunter J Promer
- Division of Biomedical Science, Marian University College of Osteopathic Medicine, Indianapolis, IN 46222, United States
| | - Jonathan W Lowery
- Division of Biomedical Science, Marian University College of Osteopathic Medicine, Indianapolis, IN 46222, United States
| | - M Terry Loghmani
- Department of Physical Therapy, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States
| | - Philip S Low
- Department of Chemistry, Purdue University, West Lafayette, IN 47907 United States
| | - Todd O McKinley
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Melissa A Kacena
- Department of Orthopaedic Surgery, Indiana University School of Medicine, Indianapolis, IN 46202, United States
- Richard L. Roudebush VA Medical Center, Indianapolis, IN 46202, United States
| | - Matthias Clauss
- Department of Medicine, Indiana University School of Medicine, Indianapolis, IN 46202, United States
| | - Jiliang Li
- Department of Biology, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, United States
| |
Collapse
|
5
|
Hornstrup T, Løwenstein FT, Larsen MA, Helge EW, Póvoas S, Helge JW, Nielsen JJ, Fristrup B, Andersen JL, Gliemann L, Nybo L, Krustrup P. Correction to: Cardiovascular, muscular, and skeletal adaptations to recreational team handball training: a randomized controlled trial with young adult untrained men. Eur J Appl Physiol 2018; 119:575-576. [PMID: 30547234 DOI: 10.1007/s00421-018-4050-5] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The author would like to correct the errors in the publication of the original article. The corrected details are given below for your reading.
Collapse
Affiliation(s)
- Therese Hornstrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark.
| | - F T Løwenstein
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - M A Larsen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - E W Helge
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - S Póvoas
- Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, University Institute of Maia, ISMAI, 4475-690, Maia, Portugal
| | - J W Helge
- Center for Healthy Aging, Department of Biomedical Sciences, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - J J Nielsen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - B Fristrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - J L Andersen
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, 2400, Copenhagen NV, Denmark
| | - L Gliemann
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - L Nybo
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - P Krustrup
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), University of Southern Denmark, 3450, Odense, Denmark.,Sport and Health Sciences, Faculty of Life and Environmental Sciences, University of Exeter, Exeter, EX1 2LU, UK
| |
Collapse
|
6
|
Hornstrup T, Løwenstein FT, Larsen MA, Helge EW, Póvoas S, Helge JW, Nielsen JJ, Fristrup B, Andersen JL, Gliemann L, Nybo L, Krustrup P. Cardiovascular, muscular, and skeletal adaptations to recreational team handball training: a randomized controlled trial with young adult untrained men. Eur J Appl Physiol 2018; 119:561-573. [PMID: 30474740 DOI: 10.1007/s00421-018-4034-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Accepted: 11/07/2018] [Indexed: 01/13/2023]
Abstract
PURPOSE The prevalence of lifestyle diseases has escalated, and effective exercise training programmes are warranted. This study tested the hypothesis that regular participation in small-sided team handball training could provide beneficial health effects on cardiovascular, skeletal, and muscular parameters in young adult untrained men. METHOD Twenty-six untrained 20-30-year-old men were randomly allocated to either a team handball training group (HG; n = 14), which completed 1.9 ± 0.3 training sessions per week over 12 weeks, or an inactive control group (CG; n = 12). Physiological training adaptations were assessed pre- and post interventions by DXA scans, blood samples, muscle biopsies, and physical tests. RESULTS The average heart rate during training was equivalent to 84 ± 4% of maximal heart rate. Compared to CG, HG displayed significant increases in VO2max (11 ± 6%), proximal femur bone mineral density (2 ± 1%), whole-body bone mineral content (2 ± 1%), intermittent endurance performance (32 ± 16%), incremental treadmill test performance (16 ± 7%) and muscle citrate synthase activity (22 ± 28%) as well as decreases in total fat mass (7 ± 7%) and total fat percentage (6 ± 7%) (all p < 0.05). There were no significant changes in muscle mass, blood pressure, resting heart rate, muscle hydroxyl-acyl-dehydrogenase activity, or blood lipids (all p > 0.05). CONCLUSION Participation in regular recreational team handball training was associated with positive cardiovascular, skeletal, and muscular adaptations, including increased maximal oxygen uptake, increased muscle enzymatic activity, and improved bone mineralization as well as lower fat percentage. These findings suggest that recreational team handball training may be an effective health-promoting activity for young adult men.
Collapse
Affiliation(s)
- Therese Hornstrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark.
| | - F T Løwenstein
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - M A Larsen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - E W Helge
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - S Póvoas
- Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, University Institute of Maia, ISMAI, 4475-690, Maia, Portugal
| | - J W Helge
- Center for Healthy Aging, Department of Biomedical Sciences, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - J J Nielsen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - B Fristrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - J L Andersen
- Institute of Sports Medicine Copenhagen, Bispebjerg Hospital, 2400, Copenhagen NV, Denmark
| | - L Gliemann
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - L Nybo
- Department of Nutrition, Exercise and Sports, University of Copenhagen, 2200, Copenhagen N, Denmark
| | - P Krustrup
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), University of Southern Denmark, 5230, Odense, Denmark
- Sport and Health Sciences, Faculty of Life and Environmental Sciences, University of Exeter, Exeter, EX1 2LU, UK
| |
Collapse
|
7
|
Elsayed MSA, Nielsen JJ, Park S, Park J, Liu Q, Kim CH, Pommier Y, Agama K, Low PS, Cushman M. Application of Sequential Palladium Catalysis for the Discovery of Janus Kinase Inhibitors in the Benzo[ c]pyrrolo[2,3- h][1,6]naphthyridin-5-one (BPN) Series. J Med Chem 2018; 61:10440-10462. [PMID: 30460842 DOI: 10.1021/acs.jmedchem.8b00510] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The present account describes the discovery and development of a new benzo[ c]pyrrolo[2,3- h][1,6]naphthyridin-5-one (BPN) JAK inhibitory chemotype that has produced selective JAK inhibitors. Sequential palladium chemistry was optimized for the rapid access to a focused library of derivatives to explore the structure-activity relationships of the new scaffold. Several compounds from the series displayed potencies in the low nanomolar range against the four members of the JAK family with various selectivity profiles. Compound 20a, with an azetidine amide side chain, showed the best selectivity for JAK1 kinase vs JAK2, JAK3, and TYK2, with low nanomolar potency (IC50 = 3.4 nM). On the other hand, BPNs 17b and 18 had good general activity against the JAK family with excellent kinome selectivity profiles. Many of the new BPNs inhibited JAK3-mediated STAT-5 phosphorylation, the production of inflammatory cytokines, and the proliferation of primary T cells. Moreover, BPN 17b showed very similar in vivo results to tofacitinib in a rheumatoid arthritis animal model.
Collapse
Affiliation(s)
- Mohamed S A Elsayed
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Jeffery J Nielsen
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Sungtae Park
- Department of Comparative Pathobiology, College of Veterinary Medicine , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Jeongho Park
- Department of Comparative Pathobiology, College of Veterinary Medicine , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Qingyang Liu
- Department of Comparative Pathobiology, College of Veterinary Medicine , Purdue University , West Lafayette , Indiana 47907 , United States.,Department of Pathology and Mary H. Weiser Food Allergy Center , University of Michigan Medical School , Ann Arbor , Michigan 48109 , United States
| | - Chang H Kim
- Department of Comparative Pathobiology, College of Veterinary Medicine , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States.,Department of Pathology and Mary H. Weiser Food Allergy Center , University of Michigan Medical School , Ann Arbor , Michigan 48109 , United States
| | - Yves Pommier
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research , National Cancer Institute , Bethesda , Maryland 20892 , United States
| | - Keli Agama
- Developmental Therapeutics Branch and Laboratory of Molecular Pharmacology, Center for Cancer Research , National Cancer Institute , Bethesda , Maryland 20892 , United States
| | - Philip S Low
- The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States.,Department of Chemistry , Purdue University , West Lafayette , Indiana 47907 , United States
| | - Mark Cushman
- Department of Medicinal Chemistry and Molecular Pharmacology, College of Pharmacy , Purdue University , West Lafayette , Indiana 47907 , United States.,The Purdue Center for Cancer Research , Purdue University , West Lafayette , Indiana 47907 , United States
| |
Collapse
|
8
|
Krustrup P, Williams CA, Mohr M, Hansen PR, Helge EW, Elbe AM, de Sousa M, Dvorak J, Junge A, Hammami A, Holtermann A, Larsen MN, Kirkendall D, Schmidt JF, Andersen TR, Buono P, Rørth M, Parnell D, Ottesen L, Bennike S, Nielsen JJ, Mendham AE, Zar A, Uth J, Hornstrup T, Brasso K, Nybo L, Krustrup BR, Meyer T, Aagaard P, Andersen JL, Hubball H, Reddy PA, Ryom K, Lobelo F, Barene S, Helge JW, Fatouros IG, Nassis GP, Xu JC, Pettersen SA, Calbet JA, Seabra A, Rebelo AN, Figueiredo P, Póvoas S, Castagna C, Milanovic Z, Bangsbo J, Randers MB, Brito J. The "Football is Medicine" platform-scientific evidence, large-scale implementation of evidence-based concepts and future perspectives. Scand J Med Sci Sports 2018; 28 Suppl 1:3-7. [PMID: 29917263 DOI: 10.1111/sms.13220] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- P Krustrup
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - C A Williams
- CHERC, Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | - M Mohr
- University of Faroe Islands, Torshavn, Faroe Islands
| | - P R Hansen
- Department of Cardiology, Gentofte University Hospital, Hellerup, Denmark
| | - E W Helge
- Department of Nutrition, Exercise and Sports (NEXS), University of Copenhagen, Copenhagen, Denmark
| | - A-M Elbe
- Universitat Leipzig, Leipzig, Germany
| | - M de Sousa
- Laboratory of Medical Investigation LIM-18, Endocrinology Division, School of Medicine, University of São Paulo, São Paulo, Brazil
| | - J Dvorak
- Spine Unit, Schulthess Clinic, Zurich, Switzerland
| | - A Junge
- Medical School Hamburg, University of Applied Sciences, Faculty of Health Sciences, Hamburg, Germany
| | - A Hammami
- Laboratory of Physiology, Faculty of Medicine of Sousse, University of Sousse, Benarous, Tunisia
| | - A Holtermann
- National Research Centre for the Working Environment, Copenhagen, Denmark
| | - M N Larsen
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - D Kirkendall
- James R. Urbaniak, Sport Sciences Institute, Duke University Medical Center, Durham, NC, USA
| | - J F Schmidt
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - T R Andersen
- Department of Sports Science and Clinical Biomechanics, Faculty of Health Sciences, University of Southern Denmark, Odense M, Denmark
| | - P Buono
- Department of Movement Sciences and Wellness, University Parthenope, Napoli, Italy
| | - M Rørth
- Department of Oncology, Copenhagen University Hospital Rigshospitalet, Copenhagen, UK
| | - D Parnell
- Department of Economics, Policy & International Business, Manchester Metropolitan University, Manchester, UK
| | - L Ottesen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - S Bennike
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - J J Nielsen
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - A E Mendham
- Non-communicable Diseases Research Unit, South African Medical Research Council, Cape Town, South Africa
| | - A Zar
- Department of Sport Science, Jahrom University, Jahrom, Iran
| | - J Uth
- The University Hospitals Centre for Health Care Research, Copenhagen University Hospital, Copenhagen, Denmark
| | - T Hornstrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - K Brasso
- Department of Urology, Copenhagen Prostate Cancer Center, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
| | - L Nybo
- NEXS, UCPH, Copenhagen, Denmark
| | - B R Krustrup
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - T Meyer
- Institute of Sports and Preventive Medicine, Saarland University, Germany
| | - P Aagaard
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - J L Andersen
- Institute of Sports Medicine Copenhagen, Copenhagen, Denmark
| | - H Hubball
- Department of Curriculum and Pedagogy, University of British Columbia, Vancouver, Canada
| | | | - K Ryom
- Department of Public Health, Aarhus University, Aarhus C, Denmark
| | - F Lobelo
- Hubert Department of Global Health, Rollins School of Public Health and Exercise is Medicine Global Research and Collaboration Center, Atlanta, Georgia, USA
| | - S Barene
- Department of Public Health, Faculty of Social and Health Sciences, Inland Norway University of Applied Sciences, Elverum, Norway
| | - J W Helge
- Department of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark
| | - I G Fatouros
- School of Physical Education and Sport Sciences, University of Thessaly, Trikala, Greece
| | | | - J C Xu
- China Institute of Sport Science, Beijing, China
| | - S A Pettersen
- School of Sport Sciences, UiT The Arctic Uniiversity of Norway, Tromsø, Norway
| | - J A Calbet
- Research Institute of Biomedical and Health Sciences, University of Las Palmas de Gran Canaria, Las Palmas de Gran Canaria, Spain
| | - A Seabra
- Portugal Football School, Portuguese Football Federation, Portugal
| | - A N Rebelo
- Faculdade de Desporto, Universidade do Porto, Porto, Portugal
| | - P Figueiredo
- Portugal Football School, Portuguese Football Federation, Portugal
| | - S Póvoas
- Research Center in Sports Sciences, Health Sciences and Human Development (CIDESD) University Institute of Maia (ISMAI), Maia, Portugal
| | - C Castagna
- School of Sport and Exercise Sciences, University of Rome Tor Vergata, Rome, Italy.,Fitness Training and Biomechanics Laboratory, Italian Footbal Association (FIGC), Technical Department, Coverciano, Italy
| | - Z Milanovic
- Faculty of Sport and Physical Education, University of Nis, Nis, Serbia.,Science and Research Centre Koper, Institute for Kinesiology Research, Koper, Slovenia
| | - J Bangsbo
- Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - M B Randers
- Department of Sports Science and Clinical Biomechanics, SDU Sport and Health Sciences Cluster (SHSC), Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark
| | - J Brito
- Portugal Football School, Portuguese Football Federation, Portugal
| |
Collapse
|
9
|
Poornejad N, Nielsen JJ, Morris RJ, Gassman JR, Reynolds PR, Roeder BL, Cook AD. Comparison of four decontamination treatments on porcine renal decellularized extracellular matrix structure, composition, and support of human renal cortical tubular epithelium cells. J Biomater Appl 2015; 30:1154-67. [PMID: 26589294 DOI: 10.1177/0885328215615760] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Engineering whole organs from porcine decellularized extracellular matrix and human cells may lead to a plentiful source of implantable organs. Decontaminating the porcine decellularized extracellular matrix scaffolds is an essential step prior to introducing human cells. However, decontamination of whole porcine kidneys is a major challenge because the decontamination agent or irradiation needs to diffuse deep into the structure to eliminate all microbial contamination while minimizing damage to the structure and composition of the decellularized extracellular matrix. In this study, we compared four decontamination treatments that could be applicable to whole porcine kidneys: 70% ethanol, 0.2% peracetic acid in 1 M NaCl, 0.2% peracetic acid in 4% ethanol, and gamma (γ)-irradiation. Porcine kidneys were decellularized by perfusion of 0.5% (w/v) aqueous solution of sodium dodecyl sulfate and the four decontamination treatments were optimized using segments (n = 60) of renal tissue to ensure a consistent comparison. Although all four methods were successful in decontamination, γ-irradiation was very damaging to collagen fibers and glycosaminoglycans, leading to less proliferation of human renal cortical tubular epithelium cells within the porcine decellularized extracellular matrix. The effectiveness of the other three optimized solution treatments were then all confirmed using whole decellularized porcine kidneys (n = 3). An aqueous solution of 0.2% peracetic acid in 1 M NaCl was determined to be the best method for decontamination of porcine decellularized extracellular matrix.
Collapse
Affiliation(s)
- Nafiseh Poornejad
- Department of Chemical Engineering, Brigham Young University, Provo, UT, USA
| | - Jeffery J Nielsen
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, UT, USA
| | - Ryan J Morris
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, UT, USA
| | - Jason R Gassman
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, UT, USA
| | - Paul R Reynolds
- Department of Physiology and Developmental Biology, Brigham Young University, Provo, UT, USA
| | | | - Alonzo D Cook
- Department of Chemical Engineering, Brigham Young University, Provo, UT, USA
| |
Collapse
|
10
|
Alfieri A, Martone D, Randers MB, Labruna G, Mancini A, Nielsen JJ, Bangsbo J, Krustrup P, Buono P. Effects of long-term football training on the expression profile of genes involved in muscle oxidative metabolism. Mol Cell Probes 2014; 29:43-7. [PMID: 25444938 DOI: 10.1016/j.mcp.2014.11.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [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: 08/05/2014] [Revised: 10/28/2014] [Accepted: 11/12/2014] [Indexed: 11/17/2022]
Abstract
We investigated whether long-term recreational football training affects the expression of health-related biochemical and molecular markers in healthy untrained subjects. Five untrained healthy men trained for 1 h 2.4 times/week for 12 weeks and 1.3 times/week for another 52 weeks. Blood samples and a muscle biopsy from the vastus lateralis were collected at T0 (pre intervention) and at T1 (post intervention). Gene expression was measured by RTqPCR on RNA extracted from muscle biopsies. The expression levels of the genes principally involved in energy metabolism (PPARγ, adiponectin, AMPKα1/α2, TFAM, NAMPT, PGC1α and SIRT1) were measured at T0 and T1. Up-regulation of PPARγ (p < 0.0005), AMPKα1 (p < 0.01), AMPKα2 (p < 0.0005) and adiponectin was observed at T1 vs T0. Increases were also found in the expression of TFAM (p < 0.001), NAMPT (p < 0.01), PGC1α (p < 0.01) and SIRT1 (p < 0.01), which are directly or indirectly involved in the glucose and lipid oxidative metabolism. Multiple linear regression analysis revealed that fat percentage was independently associated with NAMPT, PPARγ and adiponectin expression. In conclusion, long-term recreational football training could be a useful tool to improve the expression of muscle molecular biomarkers that are correlated to oxidative metabolism in healthy males.
Collapse
Affiliation(s)
- A Alfieri
- Department of Movement Sciences and Wellness (DiSMEB), University Parthenope, Naples, Italy; CEINGE - Biotecnologie Avanzate, Naples, Italy
| | - D Martone
- CEINGE - Biotecnologie Avanzate, Naples, Italy
| | - M B Randers
- Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | | | - A Mancini
- Department of Movement Sciences and Wellness (DiSMEB), University Parthenope, Naples, Italy; CEINGE - Biotecnologie Avanzate, Naples, Italy
| | - J J Nielsen
- Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - J Bangsbo
- Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | - P Krustrup
- Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark; Sport and Health Sciences, College of Life and Environmental Sciences, University of Exeter, United Kingdom
| | - P Buono
- Department of Movement Sciences and Wellness (DiSMEB), University Parthenope, Naples, Italy; IRCCS SDN, Naples, Italy.
| |
Collapse
|
11
|
Andersen TR, Schmidt JF, Nielsen JJ, Randers MB, Sundstrup E, Jakobsen MD, Andersen LL, Suetta C, Aagaard P, Bangsbo J, Krustrup P. Effect of football or strength training on functional ability and physical performance in untrained old men. Scand J Med Sci Sports 2014; 24 Suppl 1:76-85. [PMID: 24903323 DOI: 10.1111/sms.12245] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/24/2014] [Indexed: 11/29/2022]
Abstract
The effects of 16 weeks of football or strength training on performance and functional ability were investigated in 26 (68.2 ± 3.2 years) untrained men randomized into a football (FG; n = 9), a strength training (ST; n = 9), or a control group (CO; n = 8). FG and ST trained 1.6 ± 0.1 and 1.5 ± 0.1 times per week, respectively, with higher (P < 0.05) average heart rate (HR) (∼140 vs 100 bpm) and time >90%HRmax (17 vs 0%) in FG than ST, and lower (P < 0.05) peak blood lactate in FG than ST (7.2 ± 0.9 vs 10.5 ± 0.6 mmol/L). After the intervention period (IP), VO₂ max (15%; P < 0.001), cycle time to exhaustion (7%; P < 0.05), and Yo-Yo Intermittent Endurance Level 1 performance (43%; P < 0.01) were improved in FG, but unchanged in ST and CO. HR during walking was 12% and 10% lower (P < 0.05) in FG and ST, respectively, after IP. After IP, HR and blood lactate during jogging were 7% (P < 0.05) and 30% lower (P < 0.001) in FG, but unchanged in ST and CO. Sit-to-stand performance was improved (P < 0.01) by 29% in FG and 26% in ST, but not in CO. In conclusion, football and strength training for old men improves functional ability and physiological response to submaximal exercise, while football additionally elevates maximal aerobic fitness and exhaustive exercise performance.
Collapse
Affiliation(s)
- T R Andersen
- Copenhagen Centre for Team Sport and Health, Department of Nutrition, Exercise and Sports, University of Copenhagen, Copenhagen, Denmark
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
12
|
Krustrup P, Nielsen JJ, Krustrup BR, Christensen JF, Pedersen H, Randers MB, Aagaard P, Petersen AM, Nybo L, Bangsbo J. Recreational soccer is an effective health-promoting activity for untrained men. Br J Sports Med 2008; 43:825-31. [PMID: 19098116 DOI: 10.1136/bjsm.2008.053124] [Citation(s) in RCA: 173] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
To examine the effects of regular participation in recreational soccer on health profile, 36 healthy untrained Danish men aged 20-43 years were randomised into a soccer group (SO; n = 13), a running group (RU; n = 12) and a control group (CO; n = 11). Training was performed for 1 h two or three times per week for 12 weeks; at an average heart rate of 82% (SEM 2%) and 82% (1%) of HR(max) for SO and RU, respectively. During the 12 week period, maximal oxygen uptake increased (p<0.05) by 13% (3%) and 8% (3%) in SO and RU, respectively. In SO, systolic and diastolic blood pressure were reduced (p<0.05) from 130 (2) to 122 (2) mm Hg and from 77 (2) to 72 (2) mm Hg, respectively, after 12 weeks, with similar decreases observed for RU. After the 12 weeks of training, fat mass was 3.0% (2.7 (0.6) kg) and 1.8% (1.8 (0.4) kg) lower (p<0.05) for SO and RU, respectively. Only SO had an increase in lean body mass (1.7 (0.4) kg, p<0.05), an increase in lower extremity bone mass (41 (8) g, p<0.05), a decrease in LDL-cholesterol (2.7 (0.2) to 2.3 (0.2) mmol/l; p<0.05) and an increase (p<0.05) in fat oxidation during running at 9.5 km/h. The number of capillaries per muscle fibre was 23% (4%) and 16% (7%) higher (p<0.05) in SO and RU, respectively, after 12 weeks. No changes in any of the measured variables were observed for CO. In conclusion, participation in regular recreational soccer training, organised as small-sided drills, has significant beneficial effects on health profile and physical capacity for untrained men, and in some aspects it is superior to frequent moderate-intensity running.
Collapse
Affiliation(s)
- P Krustrup
- University of Copenhagen, Department of Exercise and Sport Sciences, Copenhagen Muscle Research Centre, The August Krogh Building, Universitetsparken 13, Copenhagen 2100-Ø, Denmark.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
13
|
Mohr M, Krustrup P, Nybo L, Nielsen JJ, Bangsbo J. Muscle temperature and sprint performance during soccer matches--beneficial effect of re-warm-up at half-time. Scand J Med Sci Sports 2004; 14:156-62. [PMID: 15144355 DOI: 10.1111/j.1600-0838.2004.00349.x] [Citation(s) in RCA: 203] [Impact Index Per Article: 10.2] [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: 11/28/2022]
Abstract
The relationship between quadriceps muscle temperature (T(m)) and sprint performance was evaluated during soccer matches in 25 competitive players. In one game, T(m) was determined frequently (n=9). In another game, eight players performed low-intensity activities at half-time (re-warm-up, (RW), whereas another eight players recovered passively (CON). T(m) was 36.0+/-0.2 degrees C at rest and increased (P<0.05) to 39.4+/-0.2 degrees C before the game and remained unaltered during the first half. At half-time, T(m) decreased (P<0.05) to 37.4+/-0.2 degrees C, but increased (P<0.05) to 39.2+/- degrees C during the second half. In CON and RW, T(m) and core temperature (T(c)) were similar before and after the first half, but 2.1+/-0.1 and 0.9+/-0.1 degrees C higher (P<0.05), respectively, in RW prior to the second half. At the onset of the second half, the sprint performance was reduced (P<0.05) by 2.4% in CON, but unchanged in RW. The decrease in T(m) was correlated to the decrease in performance (r=0.60, P<0.05, n=16). This study demonstrates that in soccer, the decline in T(m) and T(c) during half-time is associated with a lowered sprint capacity at the onset of the second half, whereas sprint performance is maintained when low-intensity activities preserve muscle temperature.
Collapse
Affiliation(s)
- M Mohr
- Department of Human Physiology, Institute of Exercise and Sport Sciences, August Krogh Institute, University of Copenhagen, Universitetsparken 13, DK-2100 Copenhagen Ø, Denmark
| | | | | | | | | |
Collapse
|
14
|
Juel C, Nielsen JJ, Bangsbo J. Exercise-induced translocation of Na(+)-K(+) pump subunits to the plasma membrane in human skeletal muscle. Am J Physiol Regul Integr Comp Physiol 2000; 278:R1107-10. [PMID: 10749801 DOI: 10.1152/ajpregu.2000.278.4.r1107] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [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: 11/22/2022]
Abstract
Six human subjects performed one-legged knee extensor exercise (90 +/- 4 W) until fatigue (exercise time 4.6 +/- 0.8 min). Needle biopsies were obtained from vastus lateralis muscle before and immediately after exercise. Production of giant sarcolemmal vesicles from the biopsy material was used as a membrane purification procedure, and Na(+)-K(+) pump alpha- and beta-subunits were quantified by Western blotting. Exercise significantly increased (P < 0.05) the vesicular membrane content of the alpha(2)-, total alpha-, and beta(1)-subunits by 70 +/- 29, 35 +/- 10, and 26 +/- 5%, respectively. The membrane content of alpha(1) was not changed by exercise, and the densities of subunits in muscle homogenates were unchanged. The ratio of vesicular to crude muscle homogenate content of the alpha(2)-, total alpha-, and beta(1)-subunits was elevated during exercise by 67 +/- 33 (P < 0.05), 23 +/- 6 (P < 0.05), and 40 +/- 14% (P = 0.06), respectively. It is concluded that translocation of subunits is an important mechanism involved in the short time upregulation of the Na(+)-K(+) pumps in association with human muscle activity.
Collapse
Affiliation(s)
- C Juel
- Copenhagen Muscle Research Centre, August Krogh Institute and Institute of Exercise and Sports Sciences, University of Copenhagen, DK-2100 Copenhagen, Denmark.
| | | | | |
Collapse
|
15
|
Juel C, Pilegaard H, Nielsen JJ, Bangsbo J. Interstitial K(+) in human skeletal muscle during and after dynamic graded exercise determined by microdialysis. Am J Physiol Regul Integr Comp Physiol 2000; 278:R400-6. [PMID: 10666141 DOI: 10.1152/ajpregu.2000.278.2.r400] [Citation(s) in RCA: 123] [Impact Index Per Article: 5.1] [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: 11/22/2022]
Abstract
Interstitial K(+) concentrations were measured during one-legged knee-extensor exercise by use of microdialysis with probes inserted in the vastus lateralis muscle of the subjects. K(+) in the dialysate was measured either by flame photometry or a K(+)-sensitive electrode placed in the perfusion outlet. The correction for fractional K(+) recovery was based on the assumption of identical fractional thallium loss. The interstitial K(+) was 4. 19 +/- 0.09 mM at rest and increased to 6.17 +/- 0.19, 7.48 +/- 1.18, and 9.04 +/- 0.74 mM at 10, 30, and 50 W exercise, respectively. The individual probes demonstrated large variations in interstitial K(+), and values >10 mM were obtained. The observed interstitial K(+) was markedly higher than previously found for venous K(+) concentrations at similar work intensities. The present data support a potential role for interstitial K(+) in regulation of blood flow and development of fatigue.
Collapse
Affiliation(s)
- C Juel
- Copenhagen Muscle Research Centre, August Krogh Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark.
| | | | | | | |
Collapse
|
16
|
Râdegran G, Pilegaard H, Nielsen JJ, Bangsbo J. Microdialysis ethanol removal reflects probe recovery rather than local blood flow in skeletal muscle. J Appl Physiol (1985) 1998; 85:751-7. [PMID: 9688756 DOI: 10.1152/jappl.1998.85.2.751] [Citation(s) in RCA: 19] [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: 02/08/2023] Open
Abstract
The present study compared the microdialysis ethanol outflow-inflow technique for estimating blood flow (BF) in skeletal muscle of humans with measurements by Doppler ultrasound of femoral artery inflow to the limb (BFFA). The microdialysis probes were inserted in the vastus lateralis muscle and perfused with a Ringer acetate solution containing ethanol, [2-3H]adenosine (Ado), and D-[14C(U)]glucose. BFFA at rest increased from 0.16 +/- 0.02 to 1.80 +/- 0.26 and 4.86 +/- 0.53 l/min with femoral artery infusion of Ado (AdoFA,i) at 125 and 1,000 microg . min-1 . l-1 thigh volume (low dose and high dose, respectively; P < 0.05) and to 3.79 +/- 0.37 and 6.13 +/- 0.65 l/min during one-legged, dynamic, thigh muscle exercise without and with high AdoFA,i, respectively (P < 0.05). The ethanol outflow-to-inflow ratio (38.3 +/- 2.3%) and the probe recoveries (PR) for [2-3H]Ado (35.4 +/- 1.6%) and for D-[14C(U)]glucose (15.9 +/- 1.1%) did not change with AdoFA,i at rest (P = not significant). During exercise without and with AdoFA,i, the ethanol outflow-to-inflow ratio decreased (P < 0.05) to a similar level of 17.5 +/- 3.4 and 20.6 +/- 3.2%, respectively (P = not significant), respectively, while the PR increased (P < 0.05) to a similar level (P = not significant) of 55.8 +/- 2.8 and 61.2 +/- 2. 5% for [2-3H]Ado and to 42.8 +/- 3.9 and 45.2 +/- 5.1% for D-[14C(U)]glucose. Whereas the ethanol outflow-to-inflow ratio and PR correlated inversely and positively, respectively, to the changes in BF during muscular contractions, neither of the ratio nor PR correlated to the AdoFA,i-induced BF increase. Thus the ethanol outflow-to-inflow ratio does not represent skeletal muscle BF but rather contraction-induced changes in molecular transport in the interstitium or over the microdialysis membrane.
Collapse
Affiliation(s)
- G Râdegran
- Copenhagen Muscle Research Centre, Rigshospitalet, DK-2200 Copenhagen N, Denmark.
| | | | | | | |
Collapse
|
17
|
Nielsen JJ. [The role of natural healers in our health system]. Ugeskr Laeger 1986; 148:1777-9. [PMID: 3750482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
18
|
Nielsen JJ. [Why do patients consult natural healers?]. Ugeskr Laeger 1986; 148:1780-2. [PMID: 3750483] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|