1
|
Driban JB, Vincent HK, Trojian TH, Ambrose KR, Baez S, Beresic N, Berkoff DJ, Callahan LF, Cohen B, Franek M, Golightly YM, Harkey M, Kuenze CM, Minnig MC, Mobasheri A, Naylor A, Newman CB, Padua DA, Pietrosimone B, Pinto D, Root H, Salzler M, Schmitt LC, Snyder-Mackler L, Taylor JB, Thoma LM, Vincent KR, Wellsandt E, Williams M. Preventing Osteoarthritis After an Anterior Cruciate Ligament Injury: An Osteoarthritis Action Alliance Consensus Statement. J Athl Train 2023; 58:193-197. [PMID: 37130278 PMCID: PMC10176846 DOI: 10.4085/1062-6050-0255.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
After an anterior cruciate ligament (ACL) injury, people need secondary prevention strategies to identify osteoarthritis at its earliest stages so that interventions can be implemented to halt or slow the progression toward its long-term burden. The Osteoarthritis Action Alliance formed an interdisciplinary Secondary Prevention Task Group to develop a consensus on recommendations to provide clinicians with secondary prevention strategies that are intended to reduce the risk of osteoarthritis after a person has an ACL injury. The group achieved consensus on 15 out of 16 recommendations that address patient education, exercise and rehabilitation, psychological skills training, graded-exposure therapy, cognitive-behavioral counseling (lacked consensus), outcomes to monitor, secondary injury prevention, system-level social support, leveraging technology, and coordinated care models. We hope this statement raises awareness among clinicians and researchers on the importance of taking steps to mitigate the risk of osteoarthritis after an ACL injury.
Collapse
Affiliation(s)
- Jeffrey B. Driban
- Division of Rheumatology, Allergy, and Immunology, Tufts Medical Center, Boston, MA
| | - Heather K. Vincent
- UF Health Sports Performance Center, Department of Physical Medicine and Rehabilitation, University of Florida, Gainesville
| | | | - Kirsten R. Ambrose
- Osteoarthritis Action Alliance, Thurston Arthritis Research Center, University of North Carolina, Chapel Hill
| | - Shelby Baez
- Department of Kinesiology, Michigan State University, East Lansing
| | - Nicholas Beresic
- Department of Orthopaedics, University of North Carolina, Chapel Hill
| | | | - Leigh F. Callahan
- Department of Orthopaedics, University of North Carolina, Chapel Hill
| | | | - Madison Franek
- Wellness Center at Meadowmont, Department of Therapy Services, University of North Carolina, Chapel Hill
| | | | - Matthew Harkey
- Department of Kinesiology, Michigan State University, East Lansing
| | | | - Mary Catherine Minnig
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill
| | - Ali Mobasheri
- Research Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Finland
- Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Vilnius, Lithuania
- Department of Joint Surgery, First Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
- World Health Organization Collaborating Centre for Public Health Aspects of Musculoskeletal Health and Aging, Liège, Belgium
| | - Adam Naylor
- Telos SPC, Boston, MA
- Deloitte US, Boston, MA
| | - Connie B. Newman
- Department of Medicine, Division of Endocrinology, Diabetes, and Metabolism, School of Medicine, New York University
| | - Darin A. Padua
- Department of Exercise and Sport Science, University of North Carolina, Chapel Hill
| | - Brian Pietrosimone
- Department of Orthopaedics, University of North Carolina, Chapel Hill
- Department of Exercise and Sport Science, University of North Carolina, Chapel Hill
- MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina, Chapel Hill
| | - Daniel Pinto
- Department of Physical Therapy, Marquette University, Milwaukee, WI
| | - Hayley Root
- Department of Physical Therapy and Athletic Training, Northern Arizona University, Flagstaff
| | - Matthew Salzler
- Division of Sports Medicine, Department of Orthopaedic Surgery, School of Medicine, Tufts Medical Center, Boston, MA
| | - Laura C. Schmitt
- Division of Physical Therapy, School of Health and Rehabilitation Sciences, The Ohio State University, Columbus
| | | | - Jeffrey B. Taylor
- Department of Physical Therapy, Congdon School of Health Sciences, High Point University, NC
| | - Louise M. Thoma
- Division of Physical Therapy, Department of Allied Health Sciences, University of North Carolina, Chapel Hill
| | - Kevin R. Vincent
- UF Health Sports Performance Center, Department of Physical Medicine and Rehabilitation, University of Florida, Gainesville
| | - Elizabeth Wellsandt
- Division of Physical Therapy Education, University of Nebraska Medical Center, Omaha
| | | |
Collapse
|
2
|
Driban JB, Vincent HK, Trojian TH, Ambrose KR, Baez S, Beresic N, Berkoff DJ, Callahan LF, Cohen B, Franek M, Golightly YM, Harkey M, Kuenze CM, Minnig MC, Mobasheri A, Naylor A, Newman CB, Padua DA, Pietrosimone B, Pinto D, Root H, Salzler M, Schmitt L, Snyder-Mackler L, Taylor JB, Thoma LM, Vincent KR, Wellsandt E, Williams M. Evidence Review for Preventing Osteoarthritis After an Anterior Cruciate Ligament Injury: An Osteoarthritis Action Alliance Consensus Statement. J Athl Train 2023; 58:198-219. [PMID: 37130279 PMCID: PMC10176847 DOI: 10.4085/1062-6050-0504.22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Indexed: 05/04/2023]
Abstract
CONTEXT The Osteoarthritis Action Alliance formed a secondary prevention task group to develop a consensus on secondary prevention recommendations to reduce the risk of osteoarthritis after a knee injury. OBJECTIVE Our goal was to provide clinicians with secondary prevention recommendations that are intended to reduce the risk of osteoarthritis after a person has sustained an anterior cruciate ligament injury. Specifically, this manuscript describes our methods, literature reviews, and dissenting opinions to elaborate on the rationale for our recommendations and to identify critical gaps. DESIGN Consensus process. SETTING Virtual video conference calls and online voting. PATIENTS OR OTHER PARTICIPANTS The Secondary Prevention Task Group consisted of 29 members from various clinical backgrounds. MAIN OUTCOME MEASURE(S) The group initially convened online in August 2020 to discuss the target population, goals, and key topics. After a second call, the task group divided into 9 subgroups to draft the recommendations and supportive text for crucial content areas. Twenty-one members completed 2 rounds of voting and revising the recommendations and supportive text between February and April 2021. A virtual meeting was held to review the wording of the recommendations and obtain final votes. We defined consensus as >80% of voting members supporting a proposed recommendation. RESULTS The group achieved consensus on 15 of 16 recommendations. The recommendations address patient education, exercise and rehabilitation, psychological skills training, graded-exposure therapy, cognitive-behavioral counseling (lacked consensus), outcomes to monitor, secondary injury prevention, system-level social support, leveraging technology, and coordinated care models. CONCLUSIONS This consensus statement reflects information synthesized from an interdisciplinary group of experts based on the best available evidence from the literature or personal experience. We hope this document raises awareness among clinicians and researchers to take steps to mitigate the risk of osteoarthritis after an anterior cruciate ligament injury.
Collapse
Affiliation(s)
| | - Jeffrey B. Driban
- Division of Rheumatology, Allergy, and Immunology, Tufts Medical Center, Boston, MA
| | - Heather K. Vincent
- UF Health Sports Performance Center, Department of Physical Medicine and Rehabilitation, University of Florida, Gainesville
| | - Thomas H. Trojian
- UF Health Sports Performance Center, Department of Physical Medicine and Rehabilitation, University of Florida, Gainesville
| | | | - Shelby Baez
- Osteoarthritis Action Alliance, Thurston Arthritis Research Center, University of North Carolina at Chapel Hill
| | | | - David J. Berkoff
- Department of Kinesiology, Michigan State University, East Lansing
| | - Leigh F. Callahan
- Osteoarthritis Action Alliance, Thurston Arthritis Research Center, University of North Carolina at Chapel Hill
| | | | - Madison Franek
- University of North Carolina Therapy Services, UNC Wellness Center at Meadowmont, Chapel Hill
| | - Yvonne M. Golightly
- Department of Epidemiology, Thurston Arthritis Research Center, Injury Prevention Research Center, Osteoarthritis Action Alliance, University of North Carolina at Chapel Hill
| | - Matthew Harkey
- Department of Kinesiology, Michigan State University, East Lansing
| | | | - Mary Catherine Minnig
- Department of Epidemiology, Thurston Arthritis Research Center, Injury Prevention Research Center, Osteoarthritis Action Alliance, University of North Carolina at Chapel Hill
| | - Ali Mobasheri
- Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Finland; Department of Regenerative Medicine, State Research Institute Centre for Innovative Medicine, Vilnius, Lithuania; Department of Joint Surgery, First Affiliated Hospital of Sun Yat-sen University, Guangzhou, China; World Health Organization Collaborating Centre for Public Health Aspects of Musculoskeletal Health and Aging, Liege, Belgium
| | | | - Connie B. Newman
- Department of Medicine, Division of Endocrinology, Diabetes & Metabolism, NYU Grossman School of Medicine, New York, NY
| | - Darin A. Padua
- Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
| | - Brian Pietrosimone
- Department of Physical Therapy, Congdon School of Health Sciences, High Point University, NC
| | - Daniel Pinto
- Department of Physical Therapy, Marquette University, Milwaukee, WI
| | - Hayley Root
- Department of Physical Therapy, Marquette University, Milwaukee, WI
| | - Matthew Salzler
- Department of Physical Therapy and Athletic Training, Northern Arizona University, Flagstaff
| | - Laura Schmitt
- Division of Physical Therapy, School of Health and Rehabilitation Sciences, Ohio State University, Columbus
| | | | - Jeffrey B. Taylor
- Department of Physical Therapy, Congdon School of Health Sciences, High Point University, NC
| | - Louise M. Thoma
- Division of Physical Therapy, Department of Allied Health Sciences, University of North Carolina at Chapel Hill
| | - Kevin R. Vincent
- UF Health Sports Performance Center, Department of Physical Medicine and Rehabilitation, University of Florida, Gainesville
| | - Elizabeth Wellsandt
- Division of Physical Therapy Education, University of Nebraska Medical Center, Omaha
| | - Monette Williams
- Division of Physical Therapy Education, University of Nebraska Medical Center, Omaha
| |
Collapse
|
3
|
Martinez N, Campbell B, Franek M, Buchanan L, Colquhoun R. The effect of acute pre-workout supplementation on power and strength performance. J Int Soc Sports Nutr 2016; 13:29. [PMID: 27429596 PMCID: PMC4947244 DOI: 10.1186/s12970-016-0138-7] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [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: 02/06/2016] [Accepted: 06/27/2016] [Indexed: 12/30/2022] Open
Abstract
Background Consumption of pre-workout dietary supplements by both recreational and competitive athletes has increased dramatically in recent years. The purpose of this study was to determine the acute effects of a caffeine-containing pre-workout dietary supplement on various measures of performance including anaerobic power, upper and lower body power, and upper body strength in recreationally trained males. Methods Thirteen males (mean ± SD age = 24 ± 6 yrs; height = 180.3 ± 5 cm; body mass = 83.4 ± 9 kg) participated in this investigation in which they reported to the laboratory on four separate occasions, each separated by one week. Each subject underwent an initial familiarization session on week one followed by baseline (BA) performance testing on week two. Performance testing included a medicine ball put (MBP) to determine upper body explosive power, vertical jump test (VJ) to determine lower body explosive power, one-rep maximum bench press (1-RM) for determining upper body strength, and a Wingate Anaerobic Power Test (WAnT) to determine measures of anaerobic power. On week three, subjects were randomly assigned to ingest either a pre-workout supplement (SUP) or a placebo (PL) and again complete the performance testing protocol. Subjects were provided with the crossover treatment on the fourth and final week. Performance testing commenced 20-minute following ingestion of both treatments, which was similar to previous investigations. Results Significant differences in anaerobic peak power relative to the WAnT were observed following ingestion of the SUP (782 ± 191 W) in comparison to the PL (722 ± 208 W; p = 0.003; effect size = 0.30) and BA (723 ± 205 W; p = 0.011; effect size = 0.28). Significant differences were also observed for anaerobic mean power following ingestion of the SUP (569 ± 133 W) in comparison to the PL (535 ± 149 W; p = 0.006; effect size = 0.24) and BA (538 ± 148 W; p = 0.020; effect size = 0.22). No significant differences between trials were observed for upper body power, lower body power, or upper body strength. Conclusions Ingestion of the pre-workout dietary supplement led to significant improvements in anaerobic peak and mean power values in comparison to the placebo and baseline treatments. No improvements were observed in upper and lower body power or upper body strength. Taken prior to exercise, a caffeine-containing pre-workout dietary supplement may improve anaerobic power performance.
Collapse
Affiliation(s)
- Nic Martinez
- Exercise Science Program, Performance & Physique Enhancement Laboratory, College of Education, University of South Florida, Tampa, FL 33620 USA
| | - Bill Campbell
- Exercise Science Program, Performance & Physique Enhancement Laboratory, College of Education, University of South Florida, Tampa, FL 33620 USA
| | - Madison Franek
- Exercise Science Program, Performance & Physique Enhancement Laboratory, College of Education, University of South Florida, Tampa, FL 33620 USA
| | - Laura Buchanan
- Exercise Science Program, Performance & Physique Enhancement Laboratory, College of Education, University of South Florida, Tampa, FL 33620 USA
| | - Ryan Colquhoun
- Exercise Science Program, Performance & Physique Enhancement Laboratory, College of Education, University of South Florida, Tampa, FL 33620 USA
| |
Collapse
|
4
|
Abstract
Chronic constriction injury to the sciatic nerve was used as an animal model of neuropathic pain. Instead of frequently used reflex-based tests we used an operant thermal place preference test to evaluate signs of neuropathic pain and the effect of baclofen administration in rats with neuropathy. Chronic constriction injury was induced by four loose ligations of the sciatic nerve. Thermal place preference (45 °C vs. 22 °C and 45 °C vs. 11 °C) was measured after the ligation and after the administration of baclofen in sham and experimental rats. Rats with the chronic constriction injury spent significantly less time on the colder plate compared to sham operated animals at the combination 45 °C vs. 11 °C. After administration of baclofen (10 mg/kg s.c.), the aversion to the colder plate in rats with chronic constriction injury disappeared. At the combination 45 °C vs. 22 °C, no difference in time spent on colder and/or warmer plate was found between sham and experimental animals. These findings show the importance of cold allodynia evaluation in rats with chronic constriction injury and the effectiveness of baclofen in this neuropathic pain model.
Collapse
Affiliation(s)
- K Salte
- Department of Normal, Pathological and Clinical Physiology, Third Faculty of Medicine, Charles University in Prague, Prague, Czech Republic.
| | | | | | | |
Collapse
|
5
|
Martinez N, Campbell B, Colquhoun R, Cochrane D, Franek M, Bove D, Dolan J, Buchanan L, Johnson M, St Louis C, Lamadrid P, Hinebaugh P, Attarzadeh A, Pingel A. The effect of a pre-workout supplement on power performance. J Int Soc Sports Nutr 2015. [PMCID: PMC4595384 DOI: 10.1186/1550-2783-12-s1-p24] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/04/2022] Open
|
6
|
Franek M, Legartová S, Suchánková J, Milite C, Castellano S, Sbardella G, Kozubek S, Bártová E. CARM1 modulators affect epigenome of stem cells and change morphology of nucleoli. Physiol Res 2015; 64:769-82. [PMID: 26047373 DOI: 10.33549/physiolres.932952] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
CARM1 interacts with numerous transcription factors to mediate cellular processes, especially gene expression. This is important for the maintenance of ESC pluripotency or intervention to tumorigenesis. Here, we studied epigenomic effects of two potential CARM1 modulators: an activator (EML159) and an inhibitor (ellagic acid dihydrate, EA). We examined nuclear morphology in human and mouse embryonic stem cells (hESCs, mESCs), as well as in iPS cells. The CARM1 modulators did not function similarly in all cell types. EA decreased the levels of the pluripotency markers, OCT4 and NANOG, particularly in iPSCs, whereas the levels of these proteins increased after EML159 treatment. EML159 treatment of mouse ESCs led to decreased levels of OCT4 and NANOG, which was accompanied by an increased level of Endo-A. The same trend was observed for NANOG and Endo-A in hESCs affected by EML159. Interestingly, EA mainly changed epigenetic features of nucleoli because a high level of arginine asymmetric di-methylation in the nucleoli of hESCs was reduced after EA treatment. ChIP-PCR of ribosomal genes confirmed significantly reduced levels of H3R17me2a, in both the promoter region of ribosomal genes and rDNA encoding 28S rRNA, after EA addition. Moreover, EA treatment changed the nuclear pattern of AgNORs (silver-stained nucleolus organizer regions) in all cell types studied. In EA-treated ESCs, AgNOR pattern was similar to the pattern of AgNORs after inhibition of RNA pol I by actinomycin D. Together, inhibitory effect of EA on arginine methylation and effect on related morphological parameters was especially observed in compartment of nucleoli.
Collapse
Affiliation(s)
- M Franek
- Institute of Biophysics, Czech Academy of Sciences, Brno, Czech Republic.
| | | | | | | | | | | | | | | |
Collapse
|
7
|
Kilpatrick MW, Lane SE, Stankich JD, Williams DK, Szauer M, Bledsoe C, Freeman JT, Bayer L, Franek M, Little JP. Enjoyment And Affective Responses To High-intensity Interval Training In Overweight Adults. Med Sci Sports Exerc 2015. [DOI: 10.1249/01.mss.0000478238.74472.90] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
8
|
|
9
|
Stastny K, Frgalova K, Hera A, Vass M, Franek M. In-house validation of liquid chromatography tandem mass spectrometry for determination of semicarbazide in eggs and stability of analyte in matrix. J Chromatogr A 2009; 1216:8187-91. [DOI: 10.1016/j.chroma.2009.05.087] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2009] [Revised: 05/25/2009] [Accepted: 05/28/2009] [Indexed: 10/20/2022]
|
10
|
Vaculin S, Franek M, Rokyta R. 364 THE EFFECT OF VISCERAL PAIN ON NOCICEPTIVE THRESHOLDS OF LIMBS IN RATS. Eur J Pain 2009. [DOI: 10.1016/s1090-3801(09)60367-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- S. Vaculin
- Charles University, 3rd Faculty of Medicine, Dpt. of Physiology, Prague 2, Czech Republic
| | - M. Franek
- Charles University, 3rd Faculty of Medicine, Dpt. of Physiology, Prague 2, Czech Republic
| | - R. Rokyta
- Charles University, 3rd Faculty of Medicine, Dpt. of Physiology, Prague 2, Czech Republic
| |
Collapse
|
11
|
Rokyta R, Yamamotová A, Slamberová R, Franek M, Vaculín S, Hrubá L, Schutová B, Pometlová M. Prenatal and perinatal factors influencing nociception, addiction and behavior during ontogenetic development. Physiol Res 2008; 57 Suppl 3:S79-S88. [PMID: 18481912 DOI: 10.33549/physiolres.931602] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
This review, which summarizes our findings concerning the long-term effects of pre-, peri- and postnatal factors affecting development, nociception and sensorimotor functions, focuses on three areas: 1) perinatal factors influencing nociception in adult rats were examined in rats with hippocampal lesions, after the administration of stress influencing and psychostimulant drugs (dexamethasone, indomethacine and methamphetamine); 2) the effect of pre- and early postnatal methamphetamine administration was shown to impair the development of sensorimotor functions tested in rat pups throughout the preweaning period; 3) the effect of extensive dorsal rhizotomy of the brachial plexus during the early postnatal period was studied with respect to neuropathic pain development and sensorimotor functions. The present study indicates that prenatal or neonatal stress, as well as various drugs, may disturb the development of the nociceptive system and cause long-term behavioral changes persisting to adulthood and that some types of neuropathic pain cannot be induced during the first two postnatal weeks at all. A mature nervous system is required for the development of the described pathological behaviors.
Collapse
Affiliation(s)
- R Rokyta
- Department of Normal, Pathological a Clinical Physiology, Third Faculty of Medecine, Charles University, Prague, Czech Republic.
| | | | | | | | | | | | | | | |
Collapse
|
12
|
Vass M, Diblikova I, Cernoch I, Franek M. ELISA for semicarbazide and its application for screening in food contamination. Anal Chim Acta 2008; 608:86-94. [DOI: 10.1016/j.aca.2007.11.052] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2007] [Revised: 11/29/2007] [Accepted: 11/30/2007] [Indexed: 10/22/2022]
|
13
|
Vaculin S, Franek M, Rokyta R. 224 NEUROPATHIC PAIN IN RAT PUPS. Eur J Pain 2006. [DOI: 10.1016/s1090-3801(06)60227-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
14
|
Franek M, Vaculín S, Rokyta R. GABA(B) receptor agonist baclofen has non-specific antinociceptive effect in the model of peripheral neuropathy in the rat. Physiol Res 2004; 53:351-5. [PMID: 15209544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/29/2023] Open
Abstract
Baclofen, which is a specific agonist of the metabotropic GABA(B) receptor, is used in clinical practice for the treatment of spasticity of skeletal muscles. It also exerts an analgesic effect, but this effect is still not clear and especially controversial in neuropathic pain. In this work, we studied the antinociceptive effects of baclofen in a model of chronic peripheral neuropathic pain - loose ligation of the sciatic nerve (chronic constriction injury, CCI). As controls we used sham-operated animals. The changes of thermal pain threshold were measured using the plantar test 15-25 days after the operation. The obtained results suggest that baclofen increases pain threshold in both groups. The antinociceptive effect of baclofen was dose-dependent and the maximum response without motor deficits was observed at a dose of 15 mg/kg s.c. In the rats with CCI, significant differences between affected (ipsilateral) and contralateral hind paw were present. This difference was dose-dependent, the highest value (6.2+/-1.37 s) was found at the dose of 20 mg/kg. Based on our results and previous findings it could be summarized that baclofen has antinociceptive action, which is attenuated in the model of chronic neuropathic pain probably due to the degeneration of GABA interneurons after chronic constriction injury.
Collapse
Affiliation(s)
- M Franek
- Department of Normal, Charles University, Third Faculty of Medicine, Prague, Czech Republic.
| | | | | |
Collapse
|
15
|
Vaculín S, Franek M, Rokyta R. Dorsal rhizotomy changes the spontaneous neuronal activity of nuclei in the medial thalamus. Physiol Res 2001; 49:279-83. [PMID: 10984095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023] Open
Abstract
The aim of this study was to examine the influence of unilateral dorsal root section at the cervicothoracic level of the spinal cord on the spontaneous neuronal activity of medial thalamic nuclei in the rat. Single unit extracellular recordings from thalamic nuclei, nc. parafascicularis and nc. centralis lateralis, were obtained with glass micropipettes. The abnormal bursting activity of these nuclei following deafferentation was registered, although a correlation between the occurrence of this activity and the degree of autotomy behavior was not found. Such bursts were never observed in the studied thalamic nuclei of control rats.
Collapse
Affiliation(s)
- S Vaculín
- Department of Normal, Pathological and Clinical Physiology, Charles University, Third Faculty of Medicine, Prague, Czech Republic.
| | | | | |
Collapse
|
16
|
Galvez T, Prezeau L, Milioti G, Franek M, Joly C, Froestl W, Bettler B, Bertrand HO, Blahos J, Pin JP. Mapping the agonist-binding site of GABAB type 1 subunit sheds light on the activation process of GABAB receptors. J Biol Chem 2000; 275:41166-74. [PMID: 10986293 DOI: 10.1074/jbc.m007848200] [Citation(s) in RCA: 113] [Impact Index Per Article: 4.7] [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: 01/27/2023] Open
Abstract
The gamma-amino-n-butyric acid type B (GABA(B)) receptor is composed of two subunits, GABA(B)1 and GABA(B)2, belonging to the family 3 heptahelix receptors. These proteins possess two domains, a seven transmembrane core and an extracellular domain containing the agonist binding site. This binding domain is likely to fold like bacterial periplasmic binding proteins that are constituted of two lobes that close upon ligand binding. Here, using molecular modeling and site-directed mutagenesis, we have identified residues in the GABA(B)1 subunit that are critical for agonist binding and activation of the heteromeric receptor. Our data suggest that two residues (Ser(246) and Asp(471)) located within lobe I form H bonds and a salt bridge with carboxylic and amino groups of GABA, respectively, demonstrating the pivotal role of lobe I in agonist binding. Interestingly, our data also suggest that a residue within lobe II (Tyr(366)) interacts with the agonists in a closed form model of the binding domain, and its mutation into Ala converts the agonist baclofen into an antagonist. These data demonstrate the pivotal role played by the GABA(B)1 subunit in the activation of the heteromeric GABA(B) receptor and are consistent with the idea that a closed state of the binding domain of family 3 receptors is required for their activation.
Collapse
Affiliation(s)
- T Galvez
- Mécanismes Moléculaires des Communications Cellulaires, CNRS-UPR9023, CCIPE, 141 Rue de la Cardonille, F-34094 Montpellier, France.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
17
|
Abstract
The recently cloned GABA-B receptors are related to the metabotropic glutamate receptors (mGlu receptors), the Ca2+-sensing receptor and one group of vomeronasal receptors. The GABA-B receptors likely function in a heterodimeric form, constituted of GABA-BR1 and GABA-BR2. This novel feature in the G-protein coupled receptors (GPCRs) structure raises questions as to the mechanism of recognition of G-proteins by such receptors. In the present study we show that the GABA-BR1 and BR2 subunits form a functional receptor that recognizes the extreme C-termini of the G alpha i and G alpha o proteins when expressed in HEK293 cells. Indeed, heteromeric GABA-BR1/BR2 receptors do not activate PLC when co-expressed with G alpha q, but do so when co-expressed with the chimeric G alpha qi5 or G alpha qo5 subunits, the G alpha q subunit in which the 5 C-terminal residues are those of G alpha i or G alpha o, respectively. Interestingly, the heteromeric GABA-B receptor did not activate the chimeric G alpha qz5 subunit that contains the 5 C-terminal residues of G alpha z. Among the three residues that are distinct between G alpha qo5 and G alpha qz5 (at position -5, -4 and -1), the amino acid residue at position -4 of G alpha o proteins is critical for specifying the coupling selectivity with the receptor and residue -5 influences the coupling efficacy. Interestingly, these findings correspond to data obtained with the mGluR2 receptor, a distant relative of GABA-B proteins. This shows that the same molecular determinants of the G-protein alpha-subunits are involved in the specific recognition of both the heteromeric GABA-B receptors and the other GPCRs.
Collapse
Affiliation(s)
- M Franek
- Mécanismes Moléculaires des Communications Cellulaires, CNRS-UPR9023, Montpellier, France
| | | | | | | | | | | |
Collapse
|
18
|
Samsonova ZV, Eremin SA, Egorov AM, Franek M. [The problem of selecting the structure of a labelled antigen in developing a fluorescence polarization immunoassay for atrazine]. Bioorg Khim 1994; 20:1359-64. [PMID: 7695652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Influence of labelled antigens structure on the sensitivity of the polarization fluoroimmunoassay of atrazine was studied. It is shown that the highest sensitivity is provided by the use of the heterologous labelled reagent with the shortest chemical bridge between the antigen and fluorescent label.
Collapse
|
19
|
Franek M, Krivan V. Multi-element analysis of aluminum-based ceramic powders by instrumental and radiochemical neutron activation analysis. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)80369-v] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
20
|
Franek M, Krivan V. Determination of sub-ng g−1 concentrations of thorium and uranium in microelectronic materials by radiochemical neutron activation analysis. Anal Chim Acta 1993. [DOI: 10.1016/0003-2670(93)80481-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
21
|
Franek M, Krivan V. Multi-element characterization of silicon nitride powders by instrumental and radiochemical neutron activation analysis. Anal Chim Acta 1992. [DOI: 10.1016/0003-2670(92)87024-f] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
22
|
Eremin SA, Moreva II, Dzantiev BB, Egorov AM, Franek M. [Stat-determination of the herbicide 2,4-dichlorophenoxyacetic acid by fluoroimmuno polarization using the TDx analyzer from "Abbott Laboratories"]. Vopr Med Khim 1991; 37:93-5. [PMID: 1812626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
23
|
Krivan V, Franek M, Baumann H, Pavel J. Sequential multielement analysis of a single aerosol filter by different instrumental and wet-chemical methods. ACTA ACUST UNITED AC 1990. [DOI: 10.1007/bf00324012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
24
|
Zimprich H, Franek M. [Pediatric experiences with the new semisynthetic penicilline ciclacilline (ultracillin)]. MMW Munch Med Wochenschr 1974; 116:1521-2. [PMID: 4213946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
|