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Galante P, Campos GAA, Moser JCG, Martins DB, Dos Santos Cabrera MP, Rangel M, Coelho LC, Simon KS, Amado VM, de A I Muller J, Koehbach J, Lohman RJ, Cabot PJ, Vetter I, Craik DJ, Toffoli-Kadri MC, Monge-Fuentes V, Goulart JT, Schwartz EF, Silva LP, Bocca AL, Mortari MR. Exploring the therapeutic potential of an antinociceptive and anti-inflammatory peptide from wasp venom. Sci Rep 2023; 13:12491. [PMID: 37528129 PMCID: PMC10393941 DOI: 10.1038/s41598-023-38828-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2023] [Accepted: 07/16/2023] [Indexed: 08/03/2023] Open
Abstract
Animal venoms are rich sources of neuroactive compounds, including anti-inflammatory, antiepileptic, and antinociceptive molecules. Our study identified a protonectin peptide from the wasp Parachartergus fraternus' venom using mass spectrometry and cDNA library construction. Using this peptide as a template, we designed a new peptide, protonectin-F, which exhibited higher antinociceptive activity and less motor impairment compared to protonectin. In drug interaction experiments with naloxone and AM251, Protonectin-F's activity was decreased by opioid and cannabinoid antagonism, two critical antinociception pathways. Further experiments revealed that this effect is most likely not induced by direct action on receptors but by activation of the descending pain control pathway. We noted that protonectin-F induced less tolerance in mice after repeated administration than morphine. Protonectin-F was also able to decrease TNF-α production in vitro and modulate the inflammatory response, which can further contribute to its antinociceptive activity. These findings suggest that protonectin-F may be a potential molecule for developing drugs to treat pain disorders with fewer adverse effects. Our results reinforce the biotechnological importance of animal venom for developing new molecules of clinical interest.
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Affiliation(s)
- Priscilla Galante
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Gabriel A A Campos
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Jacqueline C G Moser
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Danubia B Martins
- Department of Physics, IBILCE, São Paulo State University, São José do Rio Preto, SP, 15054-000, Brazil
| | | | - Marisa Rangel
- Immunopathology Laboratory, Butantan Institute, Sao Paulo, SP, 05503-900, Brazil
| | - Luiza C Coelho
- Laboratory of Applied Immunology, Department of Cell Biology, University of Brasilia, Brasilia, DF, 70910-900, Brazil
| | - Karina S Simon
- Laboratory of Applied Immunology, Department of Cell Biology, University of Brasilia, Brasilia, DF, 70910-900, Brazil
| | - Veronica M Amado
- Faculty of Medicine and University Hospital of Brasília, University of Brasilia, Brasilia, DF, 79910-900, Brazil
| | - Jessica de A I Muller
- Laboratory of Pharmacology and Inflammation FACFAN, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, 79070-900, Brazil
| | - Johannes Koehbach
- Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Rink-Jan Lohman
- School of Pharmacy, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Peter J Cabot
- School of Pharmacy, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Irina Vetter
- Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - David J Craik
- Institute for Molecular Bioscience, Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Monica C Toffoli-Kadri
- Laboratory of Pharmacology and Inflammation FACFAN, Federal University of Mato Grosso do Sul, Campo Grande, Mato Grosso do Sul, 79070-900, Brazil
| | - Victoria Monge-Fuentes
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Jair T Goulart
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Elisabeth F Schwartz
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil
| | - Luciano P Silva
- Laboratory of Nanobiotechnology, Embrapa Genetic Resources and Biotechnology, Brasília, DF, 70770917, Brazil
| | - Anamelia L Bocca
- Laboratory of Applied Immunology, Department of Cell Biology, University of Brasilia, Brasilia, DF, 70910-900, Brazil
| | - Márcia R Mortari
- Laboratory of Neuropharmacology, Department of Physiological Sciences, University of Brasília, Brasília, DF, 70910-900, Brazil.
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Cui L, Cai H, Sun F, Wang Y, Qu Y, Dong J, Wang H, Li J, Qian C, Li J. Beta-endorphin inhibits the inflammatory response of bovine endometrial cells through δ opioid receptor in vitro. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2021; 121:104074. [PMID: 33775662 DOI: 10.1016/j.dci.2021.104074] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2021] [Revised: 03/16/2021] [Accepted: 03/16/2021] [Indexed: 06/12/2023]
Abstract
Postpartum uterine infections are common reproductive diseases in postpartum cows. Evidence has shown that plasma β-endorphins increase during bovine uterine inflammation. However, the effect of β-endorphins on the inflammatory response in bovine endometrium has not been clarified. The aim of this study was to investigate the effect of β-endorphins on the inflammatory response of bovine endometrial epithelial and stromal cells, and to explore the possible mechanism. The cells were treated with E. coli lipopolysaccharide (LPS) to simulate inflammation, which was characterized by the significant activation of NF-κB signaling pathway and the increased gene expression of the downstream proinflammatory cytokines (approximately 1.2- to 15-fold increase, P < 0.05). By using Western blot and qPCR techniques, we found that β-endorphins inhibited the key protein expression of NF-κB pathway, and the gene expressions of TNF, IL1B, IL6, CXCL8, nitric oxide synthase 2, and prostaglandin-endoperoxide synthase 2 (P < 0.05). The co-treatment of β-endorphins and opioid antagonists showed that the anti-inflammatory effect of β-endorphins could be blocked (P < 0.05) by non-selective opioid antagonist naloxone or δ opioid receptor antagonist ICI 154129, but not the μ opioid receptor antagonist CTAP (P > 0.05). In conclusion, β-endorphins may inhibit the inflammatory response of bovine endometrial epithelial and stromal cells through δ opioid receptor.
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Affiliation(s)
- Luying Cui
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Hele Cai
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Fazhuang Sun
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Yali Wang
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Yang Qu
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Junsheng Dong
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Heng Wang
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Jun Li
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Chen Qian
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China
| | - Jianji Li
- College of Veterinary Medicine, Yangzhou University, Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Disease and Zoonoses, Yangzhou, 225009, China; Joint International Research Laboratory of Agriculture and Agriproduct Safety of the Ministry of Education, Yangzhou, Jiangsu, 225009, China.
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Antiallodynic effects of the selective NaV1.7 inhibitor Pn3a in a mouse model of acute postsurgical pain: evidence for analgesic synergy with opioids and baclofen. Pain 2020; 160:1766-1780. [PMID: 31335646 DOI: 10.1097/j.pain.0000000000001567] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Pain is the leading cause of disability in the developed world but remains a poorly treated condition. Specifically, postsurgical pain continues to be a frequent and undermanaged condition. Here, we investigate the analgesic potential of pharmacological NaV1.7 inhibition in a mouse model of acute postsurgical pain, based on incision of the plantar skin and underlying muscle of the hind paw. We demonstrate that local and systemic treatment with the selective NaV1.7 inhibitor μ-theraphotoxin-Pn3a is effectively antiallodynic in this model and completely reverses mechanical hypersensitivity in the absence of motor adverse effects. In addition, the selective NaV1.7 inhibitors ProTx-II and PF-04856264 as well as the clinical candidate CNV1014802 also reduced mechanical allodynia. Interestingly, co-administration of the opioid receptor antagonist naloxone completely reversed analgesic effects of Pn3a, indicating an involvement of endogenous opioids in the analgesic activity of Pn3a. In addition, we found superadditive antinociceptive effects of subtherapeutic Pn3a doses not only with the opioid oxycodone but also with the GABAB receptor agonist baclofen. Transcriptomic analysis of gene expression changes in dorsal root ganglia of mice after surgery did not reveal any changes in mRNA expression of endogenous opioids or opioid receptors; however, several genes involved in pain, including Runx1 (Runt related transcription factor 1), Cacna1a (CaV2.1), and Cacna1b (CaV2.2), were downregulated. In summary, these findings suggest that pain after surgery can be successfully treated with NaV1.7 inhibitors alone or in combination with baclofen or opioids, which may present a novel and safe treatment strategy for this frequent and poorly managed condition.
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Shrivastava P, Cabrera MA, Chastain LG, Boyadjieva NI, Jabbar S, Franklin T, Sarkar DK. Mu-opioid receptor and delta-opioid receptor differentially regulate microglial inflammatory response to control proopiomelanocortin neuronal apoptosis in the hypothalamus: effects of neonatal alcohol. J Neuroinflammation 2017; 14:83. [PMID: 28407740 PMCID: PMC5391607 DOI: 10.1186/s12974-017-0844-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Accepted: 03/19/2017] [Indexed: 01/25/2023] Open
Abstract
BACKGROUND Opioid receptors are known to control neurotransmission of various peptidergic neurons, but their potential role in regulation of microglia and neuronal cell communications is unknown. We investigated the role of mu-opioid receptors (MOR) and delta-opioid receptors (DOR) on microglia in the regulation of apoptosis in proopiomelanocortin (POMC) neurons induced by neonatal ethanol in the hypothalamus. METHODS Neonatal rat pups were fed a milk formula containing ethanol or control diets between postnatal days 2-6. Some of the alcohol-fed rats additionally received pretreatment of a microglia activation blocker minocycline. Two hours after the last feeding, some of the pups were sacrificed and processed for histochemical detection of microglial cell functions or confocal microscopy for detection of cellular physical interaction or used for gene and protein expression analysis. The rest of the pups were dissected for microglia separation by differential gradient centrifugation and characterization by measuring production of various activation markers and cytokines. In addition, primary cultures of microglial cells were prepared using hypothalamic tissues of neonatal rats and used for determination of cytokine production/secretion and apoptotic activity of neurons. RESULTS In the hypothalamus, neonatal alcohol feeding elevated cytokine receptor levels, increased the number of microglial cells with amoeboid-type circularity, enhanced POMC and microglial cell physical interaction, and decreased POMC cell numbers. Minocycline reversed these cellular effects of alcohol. Alcohol feeding also increased levels of microglia MOR protein and pro-inflammatory signaling molecules in the hypothalamus, and MOR receptor antagonist naltrexone prevented these effects of alcohol. In primary cultures of hypothalamic microglia, both MOR agonist [D-Ala 2, N-MePhe 4, Gly-ol]-enkephalin (DAMGO) and ethanol increased microglial cellular levels and secretion of pro-inflammatory cell signaling proteins. However, a DOR agonist [D-Pen2,5]enkephalin (DPDPE) increased microglial secretion of anti-inflammatory cytokines and suppressed ethanol's ability to increase microglial production of inflammatory signaling proteins and secretion of pro-inflammatory cytokines. In addition, MOR-activated inflammation promoted while DOR-suppressed inflammation inhibited the apoptotic effect of ethanol on POMC neurons. CONCLUSIONS These results suggest that ethanol's neurotoxic action on POMC neurons results from MOR-activated neuroinflammatory signaling. Additionally, these results identify a protective effect of a DOR agonist against the pro-inflammatory and neurotoxic action of ethanol.
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Affiliation(s)
- Pallavi Shrivastava
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Miguel A Cabrera
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Lucy G Chastain
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Nadka I Boyadjieva
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Shaima Jabbar
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Tina Franklin
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA
| | - Dipak K Sarkar
- The Endocrine Program, Department of Animal Sciences, Rutgers, The State University of New Jersey, 67 Poultry Lane, New Brunswick, NJ, 08901, USA.
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5
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The Evolution of Fangs, Venom, and Mimicry Systems in Blenny Fishes. Curr Biol 2017; 27:1184-1191. [DOI: 10.1016/j.cub.2017.02.067] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2017] [Revised: 02/16/2017] [Accepted: 02/28/2017] [Indexed: 11/24/2022]
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Morgan M, Heffernan A, Benhabib F, Wagner S, Hewavitharana AK, Shaw PN, Cabot PJ. The efficacy of Dynorphin fragments at the κ, μ and δ opioid receptor in transfected HEK cells and in an animal model of unilateral peripheral inflammation. Peptides 2017; 89:9-16. [PMID: 28049031 DOI: 10.1016/j.peptides.2016.12.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 12/20/2016] [Accepted: 12/30/2016] [Indexed: 11/16/2022]
Abstract
Dynorphin 1-17 is an endogenous peptide that is released at sites of inflammation by leukocytes, binding preferentially to κ-opioid receptors (KOP) to mediate nociception. We have previously shown that dynorphin 1-17 is rapidly biotransformed to smaller peptide fragments in inflamed tissue homogenate. This study aimed to determine the efficacy and potency of selected dynorphin fragments produced in an inflamed environment at the KOP, μ and δ-opioid receptors (MOP and DOP respectively) and in a model of inflammatory pain. Functional activity of Dynorphin 1-17 and fragments (1-6, 1-7 and 1-9) were screened over a range of concentrations against forskolin stimulated human embryonic kidney 293 (HEK) cells stably transfected with one of KOP, MOP or DOP. The analgesic activity of dynorphin 1-7 in a unilateral model of inflammatory pain was subsequently tested. Rats received unilateral intraplantar injections of Freund's Complete Adjuvant to induce inflammation. After six days rats received either dynorphin 1-7, 1-17 or the selective KOP agonist U50488H and mechanical allodynia determined. Dynorphin 1-7 and 1-9 displayed the greatest activity across all receptor subtypes, while dynorphin 1-7, 1-9 and 1-17 displaying a potent activation of both KOP and DOP evidenced by cAMP inihibition. Administration of dynorphin 1-7 and U50488H, but not dynorphin 1-17 resulted in a significant increase in paw pressure threshold at an equimolar dose suggesting the small peptide dynorphin 1-7 mediates analgesia. These results show that dynorphin fragments produced in an inflamed tissue homogenate have changed activity at the opioid receptors and that dynorphin 1-7 mediates analgesia.
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Affiliation(s)
- M Morgan
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - A Heffernan
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - F Benhabib
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - S Wagner
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia.
| | - A K Hewavitharana
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - P N Shaw
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia
| | - P J Cabot
- School of Pharmacy, The University of Queensland, Brisbane, Qld, 4072, Australia.
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7
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Abstract
This paper is the thirty-seventh consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2014 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (endogenous opioids and receptors), and the roles of these opioid peptides and receptors in pain and analgesia (pain and analgesia); stress and social status (human studies); tolerance and dependence (opioid mediation of other analgesic responses); learning and memory (stress and social status); eating and drinking (stress-induced analgesia); alcohol and drugs of abuse (emotional responses in opioid-mediated behaviors); sexual activity and hormones, pregnancy, development and endocrinology (opioid involvement in stress response regulation); mental illness and mood (tolerance and dependence); seizures and neurologic disorders (learning and memory); electrical-related activity and neurophysiology (opiates and conditioned place preferences (CPP)); general activity and locomotion (eating and drinking); gastrointestinal, renal and hepatic functions (alcohol and drugs of abuse); cardiovascular responses (opiates and ethanol); respiration and thermoregulation (opiates and THC); and immunological responses (opiates and stimulants). This paper is the thirty-seventh consecutive installment of the annual review of research concerning the endogenous opioid system. It summarizes papers published during 2014 that studied the behavioral effects of molecular, pharmacological and genetic manipulation of opioid peptides, opioid receptors, opioid agonists and opioid antagonists. The particular topics that continue to be covered include the molecular-biochemical effects and neurochemical localization studies of endogenous opioids and their receptors related to behavior (endogenous opioids and receptors), and the roles of these opioid peptides and receptors in pain and analgesia (pain and analgesia); stress and social status (human studies); tolerance and dependence (opioid mediation of other analgesic responses); learning and memory (stress and social status); eating and drinking (stress-induced analgesia); alcohol and drugs of abuse (emotional responses in opioid-mediated behaviors); sexual activity and hormones, pregnancy, development and endocrinology (opioid involvement in stress response regulation); mental illness and mood (tolerance and dependence); seizures and neurologic disorders (learning and memory); electrical-related activity and neurophysiology (opiates and conditioned place preferences (CPP)); general activity and locomotion (eating and drinking); gastrointestinal, renal and hepatic functions (alcohol and drugs of abuse); cardiovascular responses (opiates and ethanol); respiration and thermoregulation (opiates and THC); and immunological responses (opiates and stimulants).
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Affiliation(s)
- Richard J Bodnar
- Department of Psychology and Neuropsychology Doctoral Sub-Program, Queens College, City University of New York, Flushing, NY 11367, United States.
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8
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Jha NK, Jha SK, Kumar D, Kejriwal N, Sharma R, Ambasta RK, Kumar P. Impact of Insulin Degrading Enzyme and Neprilysin in Alzheimer’s Disease Biology: Characterization of Putative Cognates for Therapeutic Applications. J Alzheimers Dis 2015; 48:891-917. [DOI: 10.3233/jad-150379] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Niraj Kumar Jha
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Saurabh Kumar Jha
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Dhiraj Kumar
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Noopur Kejriwal
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Renu Sharma
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Rashmi K. Ambasta
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
| | - Pravir Kumar
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly DCE), Shahbad Daulatpur, Delhi, India
- Department of Neurology, Tufts University School of Medicine, Boston, MA, USA
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9
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Deuis JR, Whately E, Brust A, Inserra MC, Asvadi NH, Lewis RJ, Alewood PF, Cabot PJ, Vetter I. Activation of κ Opioid Receptors in Cutaneous Nerve Endings by Conorphin-1, a Novel Subtype-Selective Conopeptide, Does Not Mediate Peripheral Analgesia. ACS Chem Neurosci 2015. [PMID: 26225903 DOI: 10.1021/acschemneuro.5b00113] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
Abstract
Selective activation of peripheral κ opioid receptors (KORs) may overcome the dose-limiting adverse effects of conventional opioid analgesics. We recently developed a vicinal disulfide-stabilized class of peptides with subnanomolar potency at the KOR. The aim of this study was to assess the analgesic effects of one of these peptides, named conorphin-1, in comparison with the prototypical KOR-selective small molecule agonist U-50488, in several rodent pain models. Surprisingly, neither conorphin-1 nor U-50488 were analgesic when delivered peripherally by intraplantar injection at local concentrations expected to fully activate the KOR at cutaneous nerve endings. While U-50488 was analgesic when delivered at high local concentrations, this effect could not be reversed by coadministration with the selective KOR antagonist ML190 or the nonselective opioid antagonist naloxone. Instead, U-50488 likely mediated its peripheral analgesic effect through nonselective inhibition of voltage-gated sodium channels, including peripheral sensory neuron isoforms NaV1.8 and NaV1.7. Our study suggests that targeting the KOR in peripheral sensory nerve endings innervating the skin is not an alternative analgesic approach.
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Affiliation(s)
- Jennifer R. Deuis
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Ella Whately
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
| | | | - Marco C. Inserra
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Naghmeh H. Asvadi
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
| | | | | | - Peter J. Cabot
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
| | - Irina Vetter
- School
of Pharmacy, University of Queensland, Woolloongabba, QLD 4102, Australia
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10
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Feng HW, Hui K, Sun QW, Yu N. Ornithine aspartate combined with naloxone improves cognitive function, prognosis, and neuropeptide levels in patients with hepatic encephalopathy. Shijie Huaren Xiaohua Zazhi 2014; 22:2612-2616. [DOI: 10.11569/wcjd.v22.i18.2612] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To investigate the effect of combination therapy with ornithine aspartate plus naloxone on cognitive function, prognosis, and neuropeptide levels in patients with hepatic encephalopathy.
METHODS: One hundred and two patients diagnosed with hepatic encephalopathy were randomly divided into two equal groups: a control group (n = 51) and a study group (n = 51). The control group received traditional medical treatment, and the research group was additionally given combination therapy with ornithine aspartate plus naloxone on the basis of traditional medical treatment. The cognitive function of the patients was assessed. The response rate and time duration from coma to consciousness were recorded. Changes in blood ammonia level, markers of liver function, and neuropeptide levels were measured by standard biochemical assays.
RESULTS: The response rate was significantly higher in the study group than in the control group (86.27% vs 68.63%, P < 0.05). After treatment, the level of blood ammonia in both groups was decreased (P < 0.05). The level of blood ammonia in the study group was significantly lower than that in the control group (52.01 μmol/L ± 7.49 μmol/L vs 75.44 μmol/L ± 5.86 μmol/L, P < 0.01). The liver function markers in the two groups were also significantly improved after treatment (P < 0.05). The levels of alanine aminotransferase, gamma glutamine transferase and total bilirubin in the study group were significantly lower than those in the control group (38.5 U/L ± 5.8 U/L vs 55.3 U/L ± 4.4 U/L, 149.3 U/L ± 19.2 U/L vs 174.2 U/L ± 23.6 U/L, 65.6 μmol/L ± 10.8 μmol/L vs 81.3 μmol/L ± 12.9 μmol/L, P < 0.01). After treatment, the time duration from coma to consciousness in the study group was significantly lower than in the control group (7.53 h ± 2.68 h vs 21.02 h ± 9.83 h, P < 0.05). The MMSE and HDS-R scores in the study group were significantly higher than those in the control group (22.09 ± 2.41 vs 17.76 ± 2.02, 24.11 ± 4.12 vs 16.18 ± 3.19, P < 0.05). After treatment, the levels of arginine vasopressin and beta-endorphin in both groups were decreased (P < 0.05). The levels of arginine vasopressin and beta-endorphin in the study group were significantly lower than those in the control group (11.28 pg/mL ± 2.08 pg/mL vs 15.35 pg/mL ± 1.65 pg/mL, 42.02 pg/mL ± 7.66 pg/mL vs 53.66 pg/mL ± 6.81 pg/mL, P < 0.01).
CONCLUSION: Ornithine aspartate combined with naloxone can improve cognitive function in patients with hepatic encephalopathy, and the treatment effect is superior compared to conventional treatment.
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