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Chen D, Zhang M, Zhang Q, Wu S, Yu B, Zhang X, Hu X, Zhang S, Yang Z, Kuang J, Xu B, Fang Q. The blockade of neuropeptide FF receptor 1 and 2 differentially contributed to the modulating effects on fentanyl-induced analgesia and hyperalgesia in mice. Eur J Pharmacol 2024; 969:176457. [PMID: 38395375 DOI: 10.1016/j.ejphar.2024.176457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2023] [Revised: 02/21/2024] [Accepted: 02/21/2024] [Indexed: 02/25/2024]
Abstract
Neuropeptide FF (NPFF) plays a critical role in various physiological processes through the activation of neuropeptide FF receptor 1 and 2 (NPFFR1 and NPFFR2). Numerous evidence has indicated that NPFF exhibits opposite opioid-modulating effects on opioid-induced analgesia after supraspinal and spinal administrations, while the detailed role of NPFFR1 and NPFFR2 remains unclear. In this study, we employed pharmacological and genetic inhibition of NPFFR to investigate the modulating roles of central NPFFR1 and NPFFR2 in opioid-induced analgesia and hyperalgesia, using a male mouse model of acute fentanyl-induced analgesia and secondary hyperalgesia. Our findings revealed that intrathecal (i.t.) injection of the nonselective NPFFR antagonist RF9 significantly enhanced fentanyl-induced analgesia, whereas intracerebroventricular (i.c.v.) injection did not show the same effect. Moreover, NPFFR2 deficient (npffr2-/-) mice exhibited stronger analgesic responses to fentanyl compared to wild type (WT) or NPFFR1 knockout (npffr1-/-) mice. Intrathecal injection of RF9 in npffr1-/- mice also significantly enhanced fentanyl-induced analgesia. These results indicate a crucial role of spinal NPFFR2 in the enhancement of opioid analgesia. Contrastingly, hyperalgesia induced by fentanyl was markedly reversed in npffr1-/- mice but remained unaffected in npffr2-/- mice. Similarly, i.c.v. injection of the selective NPFFR1 antagonist RF3286 effectively prevented fentanyl-induced hyperalgesia in WT or npffr2-/- mice. Notably, co-administration of i.c.v. RF3286 and i.t. RF9 augmented fentanyl-induced analgesia while reducing hyperalgesia. Collectively, these findings highlight the modulating effects of blocking spinal NPFFR2 and supraspinal NPFFR1 on fentanyl-induced analgesia and hyperalgesia, respectively, which shed a light on understanding the pharmacological function of NPFF system in future studies.
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Affiliation(s)
- Dan Chen
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Mengna Zhang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Qinqin Zhang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Shuyuan Wu
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Bowen Yu
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Xiaodi Zhang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Xuanran Hu
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Shichao Zhang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Zhenyun Yang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Junzhe Kuang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Biao Xu
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China.
| | - Quan Fang
- Institute of Physiology, School of Basic Medical Sciences, and State Key Laboratory of Animal Disease Control and Prevention, College of Veterinary Medicine, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China.
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Shin Y, Jung W, Kim MY, Shin D, Kim GH, Kim CH, Park SH, Cho EH, Choi DW, Han CJ, Lee KH, Kim SB, Shin HJ. NPFFR2 Contributes to the Malignancy of Hepatocellular Carcinoma Development by Activating RhoA/YAP Signaling. Cancers (Basel) 2022; 14:cancers14235850. [PMID: 36497331 PMCID: PMC9737590 DOI: 10.3390/cancers14235850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2022] [Revised: 11/20/2022] [Accepted: 11/24/2022] [Indexed: 11/29/2022] Open
Abstract
G protein-coupled receptors (GPCRs) are a diverse family of cell surface receptors implicated in various physiological functions, making them common targets for approved drugs. Many GPCRs are abnormally activated in cancers and have emerged as therapeutic targets for cancer. Neuropeptide FF receptor 2 (NPFFR2) is a GPCR that helps regulate pain and modulates the opioid system; however, its function remains unknown in cancers. Here, we found that NPFFR2 is significantly up-regulated in liver cancer and its expression is related to poor prognosis. Silencing of NPFFR2 reduced the malignancy of liver cancer cells by decreasing cell survival, invasion, and migration, while its overexpression increased invasion, migration, and anchorage-independent cell growth. Moreover, we found that the malignant function of NPFFR2 depends on RhoA and YAP signaling. Inhibition of Rho kinase activity completely restored the phenotypes induced by NPFFR2, and RhoA/F-Actin/YAP signaling was controlled by NPFFR2. These findings demonstrate that NPFFR2 may be a potential target for the treatment of hepatocellular carcinoma.
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Affiliation(s)
- Yuna Shin
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
- Radiological and Medico-Oncological Sciences, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Wonhee Jung
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
| | - Mi-Yeon Kim
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
| | - Dongjo Shin
- Radiological and Medico-Oncological Sciences, University of Science and Technology, Daejeon 34113, Republic of Korea
- Division of Radiation Biomedical, Research Korea Institute of Radiological and Medical Sciences, Seoul 1812, Republic of Korea
| | - Geun Hee Kim
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
- Radiological and Medico-Oncological Sciences, University of Science and Technology, Daejeon 34113, Republic of Korea
| | - Chun Ho Kim
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
| | - Sun-Hoo Park
- Department of Pathology, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Republic of Korea
| | - Eung-Ho Cho
- Department of Surgery, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Republic of Korea
| | - Dong Wook Choi
- Department of Surgery, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Republic of Korea
| | - Chul Ju Han
- Department of Internal Medicine, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Republic of Korea
| | - Kee Ho Lee
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
| | - Sang-Bum Kim
- Department of Surgery, Korea Institute of Radiological and Medical Sciences, Seoul 01812, Republic of Korea
- Correspondence: (S.-B.K.); (H.J.S.)
| | - Hyun Jin Shin
- Team of Radiation Convergence Research, Korea Institute of Radiological & Medical Sciences, Seoul 01812, Republic of Korea
- Radiological and Medico-Oncological Sciences, University of Science and Technology, Daejeon 34113, Republic of Korea
- Correspondence: (S.-B.K.); (H.J.S.)
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3
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Kaczyńska K, Wojciechowski P. Non-Opioid Peptides Targeting Opioid Effects. Int J Mol Sci 2021; 22:13619. [PMID: 34948415 PMCID: PMC8709238 DOI: 10.3390/ijms222413619] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 01/07/2023] Open
Abstract
Opioids are the most potent widely used analgesics, primarily, but not exclusively, in palliative care. However, they are associated with numerous side effects, such as tolerance, addiction, respiratory depression, and cardiovascular events. This, in turn, can result in their overuse in cases of addiction, the need for dose escalation in cases of developing tolerance, and the emergence of dose-related opioid toxicity, resulting in respiratory depression or cardiovascular problems that can even lead to unintentional death. Therefore, a very important challenge for researchers is to look for ways to counteract the side effects of opioids. The use of peptides and their related compounds, which have been shown to modulate the effects of opioids, may provide such an opportunity. This short review is a compendium of knowledge about the most important and recent findings regarding selected peptides and their modulatory effects on various opioid actions, including cardiovascular and respiratory responses. In addition to the peptides more commonly reported in the literature in the context of their pro- and/or anti-opioid activity-such as neuropeptide FF (NPFF), cholecystokinin (CCK), and melanocyte inhibiting factor (MIF)-we also included in the review nociceptin/orphanin (N/OFQ), ghrelin, oxytocin, endothelin, and venom peptides.
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Affiliation(s)
- Katarzyna Kaczyńska
- Department of Respiration Physiology, Mossakowski Medical Research Institute, Polish Academy of Sciences, Pawińskiego 5 St., 02-106 Warsaw, Poland;
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Serrano NE, Saputra SG, Íbias J, Company M, Nazarian A. Pain-induced impulsivity is sexually dimorphic and mu-opioid receptor sensitive in rats. Psychopharmacology (Berl) 2021; 238:3447-3462. [PMID: 34427720 DOI: 10.1007/s00213-021-05963-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 08/10/2021] [Indexed: 12/13/2022]
Abstract
RATIONALE AND OBJECTIVES Pain sensation can negatively impact cognitive function, including impulsivity. Pain-induced changes in impulsivity can contribute to development of psychiatric comorbidities found in those with chronic pain conditions. The goal of this study was to determine whether complete Freund's adjuvant (CFA)-induced pain manipulation enhances impulsivity in rats. Whether the pain-induced impulsivity is sexually dimorphic, and if mu-opioid receptors play a role in these processes. METHODS Male and female rats were screened for trait impulsivity and designated as high or low impulsive using a delay discounting task. Rats then received a hind paw injection of CFA, and their impulsivity was assessed for 16 days. The effects of morphine on impulsivity were also examined. In a separate experiment, rats were pretreated with beta-funaltrexamine (β-FNA) to determine the role of mu-opioid receptors on impulsivity. RESULTS CFA treatment increased impulsivity in males and females. The onset of CFA-induced impulsivity was faster in high impulsive females than males. Morphine blocked CFA-induced impulsivity in both sexes in a dose- and time-dependent manner. β-FNA prevented the actions of morphine on CFA-induced impulsivity in high impulsive males, but not high impulsive females. Moreover, β-FNA increased CFA-induced impulsivity in morphine naïve males, but not females. CONCLUSION These findings demonstrate unique sex differences in CFA-induced impulsivity, response to morphine, and the impact of mu-opioid receptors. A better understanding of cognitive deficits and their mechanisms can provide insight into the development of substance abuse and psychiatric comorbidities that occur in people with chronic pain.
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Affiliation(s)
- Nidia Espinoza Serrano
- Department of Pharmaceutical Sciences, Western University of Health Sciences, 309 E. Second Street, Pomona, CA, 91766, USA
| | - Samuel G Saputra
- Department of Pharmaceutical Sciences, Western University of Health Sciences, 309 E. Second Street, Pomona, CA, 91766, USA
| | - Javier Íbias
- Departamento de Metodologίa de Las Ciencias del Comportamiento, Facultad de Psicologίa, Universidad Nacional de Educacίon a Distancia (UNED), 28040, Madrid, Spain
| | - Matthew Company
- Department of Pharmaceutical Sciences, Western University of Health Sciences, 309 E. Second Street, Pomona, CA, 91766, USA
| | - Arbi Nazarian
- Department of Pharmaceutical Sciences, Western University of Health Sciences, 309 E. Second Street, Pomona, CA, 91766, USA.
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5
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Zhang L, Koller J, Ip CK, Gopalasingam G, Bajaj N, Lee NJ, Enriquez RF, Herzog H. Lack of neuropeptide FF signalling in mice leads to reduced repetitive behavior, altered drinking behavior, and fuel type selection. FASEB J 2021; 35:e21980. [PMID: 34694651 DOI: 10.1096/fj.202100703r] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2021] [Revised: 09/06/2021] [Accepted: 09/22/2021] [Indexed: 12/20/2022]
Abstract
Although best known for their involvement in modulating nociception, Neuropeptide FF (NPFF) group peptides have been suggested to fulfil a variety of biological functions such as feeding, anxiety behaviors and thermogenesis. However, evidence supporting these functions of NPFF is mostly pharmacological, leaving the physiological relevance unaddressed. Here we examined the physiological impact of lack of NPFF signalling in both genders using a Npff-/- mouse model. NPFF expression in the mouse is restricted to the spinal cord and brainstem while its cognate receptor NPFFR2 has wider distribution throughout the brain. Both male and female Npff-/- mice showed reduced repetitive behaviors evidenced in the marble burying test and self-grooming test. A decrease in anxiety-related behaviors in the Npff-/- mice was also observe in the open field test and to a lesser degree in an elevated plus maze test. Moreover, both male and female Npff-/- mice exhibited increased water intake resulting from increases in drinking size, rather than number of drinking events. During a fasting-refeeding challenge, Npff-/- mice of both genders displayed alterations in reparatory exchange ratio that reflect a greater fuel type flexibility. Npff-/- mice were otherwise wild-type-like regarding body weight, body composition, feeding behaviors, locomotion or energy expenditure. Together, these findings reveal the important physiological roles of NPFF signalling in the regulation of anxiety-related and repetitive behaviors, fluid homeostasis and oxidative fuel selection, highlighting the therapeutical potential of the NPFF system in a number of behavioral and metabolic disorders.
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Affiliation(s)
- Lei Zhang
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia.,St. Vincent's Clinical School, University of NSW, Sydney, New South Wales, Australia
| | - Julia Koller
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia.,St. Vincent's Clinical School, University of NSW, Sydney, New South Wales, Australia
| | - Chi Kin Ip
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia.,St. Vincent's Clinical School, University of NSW, Sydney, New South Wales, Australia
| | - Gopana Gopalasingam
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Nikita Bajaj
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Nicola J Lee
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia.,St. Vincent's Clinical School, University of NSW, Sydney, New South Wales, Australia
| | - Ronaldo F Enriquez
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia
| | - Herbert Herzog
- Neuroscience Division, Garvan Institute of Medical Research, St Vincent's Hospital, Darlinghurst, New South Wales, Australia.,School of Medical Sciences, University of NSW, Sydney, New South Wales, Australia.,Faculty of Medicine, University of NSW, Sydney, New South Wales, Australia
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Zhang R, Xu B, Zhang Q, Chen D, Zhang M, Zhao G, Xu K, Xiao J, Zhu H, Niu J, Li N, Fang Q. Spinal administration of the multi-functional opioid/neuropeptide FF agonist BN-9 produced potent antinociception without development of tolerance and opioid-induced hyperalgesia. Eur J Pharmacol 2020; 880:173169. [PMID: 32416184 DOI: 10.1016/j.ejphar.2020.173169] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Revised: 04/24/2020] [Accepted: 05/04/2020] [Indexed: 10/24/2022]
Abstract
Chronic opioids treatment is impeded by the development of analgesic tolerance and opioid-induced hyperalgesia. Recent studies have shown that multi-functional opioid compounds produce analgesic activities with limited side effects. We developed a novel multi-functional peptide targeting opioid and neuropeptide FF receptors named BN-9, which produced potent and non-tolerance forming antinociceptive effect after supraspinal and systemic administrations. In the present study, the analgesic properties and potential side effects of intrathecal BN-9 were investigated in a range of preclinical rodent models. In complete Freund's adjuvant-induced inflammatory pain model, intrathecal BN-9 dose-dependently produced analgesic effect via opioid receptors, and the spinal antinociceptive effect was augmented by the neuropeptide FF receptor antagonist RF9. In contrast, in plantar incision-induced postoperative pain model, BN-9 exhibited potent anti-allodynic effect via opioid receptors and, at least partially, neuropeptide FF receptors. In mouse models of acetic acid-induced visceral pain and formalin pain, BN-9-induced spinal antinociception was mainly mediated by opioid receptors, independent of neuropeptide FF receptors. Furthermore, at the spinal level, chronic treatments with BN-9 did not lead to analgesic tolerance and cross-tolerance to morphine. Moreover, opioid-induced hyperalgesia was observed after repeated administration of morphine, but not BN-9. Taken together, our present study suggests that intrathecal BN-9 produces potent and non-tolerance forming antinociception, and does not cause opioid-induced hyperalgesia. Thus, BN-9 might serve as a promising lead compound in the development of multi-functional opioid analgesics with minimized side effects.
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Affiliation(s)
- Run Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Biao Xu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Qinqin Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Dan Chen
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Mengna Zhang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Guanghai Zhao
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Kangtai Xu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Jian Xiao
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Hanwen Zhu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Jiandong Niu
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China
| | - Ning Li
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China.
| | - Quan Fang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and Institute of Physiology, School of Basic Medical Sciences, Lanzhou University, 199 Donggang West Road, Lanzhou, 730000, PR China.
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Nguyen T, Marusich J, Li JX, Zhang Y. Neuropeptide FF and Its Receptors: Therapeutic Applications and Ligand Development. J Med Chem 2020; 63:12387-12402. [PMID: 32673481 DOI: 10.1021/acs.jmedchem.0c00643] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The endogenous neuropeptide FF (NPFF) and its two cognate G protein-coupled receptors, Neuropeptide FF Receptors 1 and 2 (NPFFR1 and NPFFR2), represent a relatively new target system for many therapeutic applications including pain regulation, modulation of opioid side effects, drug reward, anxiety, cardiovascular conditions, and other peripheral effects. Since the cloning of NPFFR1 and NPFFR2 in 2000, significant progress has been made to understand their pharmacological roles and interactions with other receptor systems, notably the opioid receptors. A variety of NPFFR ligands with different mechanisms of action (agonists or antagonists) have been discovered although with limited subtype selectivities. Differential pharmacological effects have been observed for many of these NPFFR ligands, depending on assays/models employed and routes of administration. In this Perspective, we highlight the therapeutic potentials, current knowledge gaps, and latest updates of the development of peptidic and small molecule NPFFR ligands as tool compounds and therapeutic candidates.
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Affiliation(s)
- Thuy Nguyen
- Center for Drug Discovery, Research Triangle Institute, 3040 East Cornwallis Road, Research Triangle Park, North Carolina 27709, United States
| | - Julie Marusich
- Center for Drug Discovery, Research Triangle Institute, 3040 East Cornwallis Road, Research Triangle Park, North Carolina 27709, United States
| | - Jun-Xu Li
- Department of Pharmacology and Toxicology, University at Buffalo, the State University of New York, Buffalo, New York 14203, United States
| | - Yanan Zhang
- Center for Drug Discovery, Research Triangle Institute, 3040 East Cornwallis Road, Research Triangle Park, North Carolina 27709, United States
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Gibula-Tarlowska E, Grochecki P, Silberring J, Kotlinska JH. The kisspeptin derivative kissorphin reduces the acquisition, expression, and reinstatement of ethanol-induced conditioned place preference in rats. Alcohol 2019; 81:11-19. [PMID: 30981809 DOI: 10.1016/j.alcohol.2019.04.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Revised: 03/25/2019] [Accepted: 04/05/2019] [Indexed: 12/17/2022]
Abstract
Research has shown that opioids are involved in the rewarding effects of ethanol. Neuropeptide FF (NPFF) has been described as an anti-opioid peptide because, in many cases, it inhibits opioid and ethanol effects in rodents. Kissorphin (KSO) is a new peptide derived from kisspeptin-10 with structural similarities to NPFF. This peptide possesses NPFF-like biological activity in vitro. The aim of the current study was to investigate whether KSO (Tyr-Asn-Trp-Asn-Ser-Phe-NH2) influences the acquisition, expression, and reinstatement of ethanol-induced conditioned place preference (ethanol-CPP) in rats. The ethanol-CPP was established (conditioning for 5 days) by intraperitoneal (i.p.) administration of ethanol (1 g/kg, 20%, w/v) using an unbiased procedure. After that, one group of rats was used in final post-conditioning testing (expression of CPP) and the other group received a priming injection of ethanol after 10 days of extinction (reinstatement of CPP). Our experiments showed that KSO, given intravenously (i.v.) at the doses of 1, 3, and 10 nmol before every ethanol administration, inhibited the acquisition and, given acutely before the post-conditioning test or before the priming dose of ethanol, inhibited the expression and reinstatement of ethanol-CPP, respectively, in a dose-dependent manner. KSO given by itself neither induced place preference nor aversion and did not alter locomotor activity and coordination of rats. These results suggest that KSO can alter rewarding/motivational effects of ethanol. These data suggest this peptide possesses an anti-opioid character.
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Affiliation(s)
- Ewa Gibula-Tarlowska
- Department of Pharmacology and Pharmacodynamics, Medical University, Lublin, Poland.
| | - Pawel Grochecki
- Department of Pharmacology and Pharmacodynamics, Medical University, Lublin, Poland
| | - Jerzy Silberring
- Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Krakow, Poland; Centre of Polymer and Carbon Materials, Polish Academy of Sciences, Zabrze, Poland
| | - Jolanta H Kotlinska
- Department of Pharmacology and Pharmacodynamics, Medical University, Lublin, Poland
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Gutierrez-Mecinas M, Bell A, Polgár E, Watanabe M, Todd AJ. Expression of Neuropeptide FF Defines a Population of Excitatory Interneurons in the Superficial Dorsal Horn of the Mouse Spinal Cord that Respond to Noxious and Pruritic Stimuli. Neuroscience 2019; 416:281-293. [PMID: 31421202 PMCID: PMC6839401 DOI: 10.1016/j.neuroscience.2019.08.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2019] [Revised: 07/15/2019] [Accepted: 08/06/2019] [Indexed: 12/16/2022]
Abstract
The great majority of neurons in the superficial dorsal horn of the spinal cord are excitatory interneurons, and these are required for the normal perception of pain and itch. We have previously identified 5 largely non-overlapping populations among these cells, based on the expression of four different neuropeptides (cholecystokinin, neurotensin, neurokinin B and substance P) and of green fluorescent protein driven by the promoter for gastrin-releasing peptide (GRP) in a transgenic mouse line. Another peptide (neuropeptide FF, NPFF) has been identified among the excitatory neurons, and here we have used an antibody against the NPFF precursor (pro-NPFF) and a probe that recognises Npff mRNA to identify and characterise these cells. We show that they are all excitatory interneurons, and are separate from the five populations listed above, accounting for ~ 6% of the excitatory neurons in laminae I-II. By examining phosphorylation of extracellular signal-regulated kinases, we show that the NPFF cells can respond to different types of noxious and pruritic stimulus. Ablation of somatostatin-expressing dorsal horn neurons has been shown to result in a dramatic reduction in mechanical pain sensitivity, while somatostatin released from these neurons is thought to contribute to itch. Since the great majority of the NPFF cells co-expressed somatostatin, these cells may play a role in the perception of pain and itch. NPFF is expressed by around 6% of the excitatory interneurons in the superficial dorsal horn of the mouse spinal cord. NPFF cells differ from those that express substance P, cholecystokinin, neurotensin or neurokinin B. Although some NPFF cells express gastrin-releasing peptide (GRP), they do not express GFP in a GRP-GFP mouse line. Some NPFF cells are activated by noxious or pruritic stimuli.
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Affiliation(s)
- Maria Gutierrez-Mecinas
- Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Andrew Bell
- Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Erika Polgár
- Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK
| | - Masahiko Watanabe
- Department of Anatomy, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
| | - Andrew J Todd
- Institute of Neuroscience and Psychology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow, G12 8QQ, UK.
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10
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Nourbakhsh F, Atabaki R, Roohbakhsh A. The role of orphan G protein-coupled receptors in the modulation of pain: A review. Life Sci 2018; 212:59-69. [PMID: 30236869 DOI: 10.1016/j.lfs.2018.09.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 09/04/2018] [Accepted: 09/14/2018] [Indexed: 12/16/2022]
Abstract
G protein-coupled receptors (GPCRs) comprise a large number of receptors. Orphan GPCRs are divided into six families. These groups contain orphan receptors for which the endogenous ligands are unclear. They have various physiological effects in the body and have the potential to be used in the treatment of different diseases. Considering their important role in the central and peripheral nervous system, their role in the treatment of pain has been the subject of some recent studies. At present, there are effective therapeutics for the treatment of pain including opioid medications and non-steroidal anti-inflammatory drugs. However, the side effects of these drugs and the risks of tolerance and dependence remain a major problem. In addition, neuropathic pain is a condition that does not respond to currently available analgesic medications well. In the present review article, we aimed to review the most recent findings regarding the role of orphan GPCRs in the treatment of pain. Accordingly, based on the preclinical findings, the role of GPR3, GPR7, GPR8, GPR18, GPR30, GPR35, GPR40, GPR55, GPR74, and GPR147 in the treatment of pain was discussed. The present study highlights the role of orphan GPCRs in the modulation of pain and implies that these receptors are potential new targets for finding better and more efficient therapeutics for the management of pain particularly neuropathic pain.
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Affiliation(s)
- Fahimeh Nourbakhsh
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Rabi Atabaki
- Rayan Center for Neuroscience & Behavior, Department of Biology, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ali Roohbakhsh
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran; Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.
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11
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12
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Zhang R, Xu B, Zhang MN, Zhang T, Wang ZL, Zhao G, Zhao GH, Li N, Fang Q, Wang R. Peripheral and central sites of action for anti-allodynic activity induced by the bifunctional opioid/NPFF receptors agonist BN-9 in inflammatory pain model. Eur J Pharmacol 2017; 813:122-129. [DOI: 10.1016/j.ejphar.2017.07.044] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Revised: 07/04/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
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13
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Lin YT, Liu HL, Day YJ, Chang CC, Hsu PH, Chen JC. Activation of NPFFR2 leads to hyperalgesia through the spinal inflammatory mediator CGRP in mice. Exp Neurol 2017; 291:62-73. [DOI: 10.1016/j.expneurol.2017.02.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2016] [Revised: 01/25/2017] [Accepted: 02/01/2017] [Indexed: 01/22/2023]
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14
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Mudgal A, Kumar K, Mollereau C, Pasha S. NPYFa, A Chimeric Peptide of Met-Enkephalin, and NPFF Induces Tolerance-Free Analgesia. Chem Biol Drug Des 2016; 87:885-94. [DOI: 10.1111/cbdd.12721] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 11/30/2015] [Accepted: 12/30/2015] [Indexed: 12/11/2022]
Affiliation(s)
- Annu Mudgal
- Peptide Synthesis Laboratory; CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB); New Delhi India
- Academy of Scientific and Innovative Research (AcSIR); CSIR-IGIB Campus; New Delhi India
| | - Krishan Kumar
- Peptide Synthesis Laboratory; CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB); New Delhi India
- Department of Chemistry; Motilal Nehru College; University of Delhi; Delhi 110021 India
| | - Catherine Mollereau
- Institut de Pharmacologie et Biologie Structurale; Toulouse Cedex France
- Laboratoire Anthropologie Moléculaire et Imagerie de Synthèse; Toulouse Cedex France
| | - Santosh Pasha
- Peptide Synthesis Laboratory; CSIR-Institute of Genomics and Integrative Biology (CSIR-IGIB); New Delhi India
- Academy of Scientific and Innovative Research (AcSIR); CSIR-IGIB Campus; New Delhi India
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15
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Lin Y, Kao S, Day Y, Chang C, Chen J. Altered nociception and morphine tolerance in neuropeptide FF receptor type 2 over-expressing mice. Eur J Pain 2015; 20:895-906. [DOI: 10.1002/ejp.814] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Y.T. Lin
- Department of Physiology and Pharmacology; Graduate Institute of Biomedical Sciences; Chang Gung University; Tao-Yuan Taiwan
| | - S.C. Kao
- Department of Anesthesiology; Chang Gung Memorial Hospital; Tao-Yuan Taiwan
| | - Y.J. Day
- Department of Anesthesiology; Chang Gung Memorial Hospital; Tao-Yuan Taiwan
| | - C.C. Chang
- Department of Chemistry; Fu Jen Catholic University; New Taipei City Taiwan
| | - J.C. Chen
- Department of Physiology and Pharmacology; Graduate Institute of Biomedical Sciences; Chang Gung University; Tao-Yuan Taiwan
- Healthy Aging Research Center; Chang Gung University; Tao-Yuan Taiwan
- Neuroscience Research Center; Chang Gung Memorial Hospital; Tao-Yuan Taiwan
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16
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Mudgal A, Pasha S. Role of opioid receptor heterodimerization in pain modulation and tolerance development. World J Pharmacol 2015; 4:144-159. [DOI: 10.5497/wjp.v4.i1.144] [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] [Received: 07/15/2014] [Revised: 10/09/2014] [Accepted: 02/11/2015] [Indexed: 02/06/2023] Open
Abstract
Protein to protein interactions leading to homo/heteromerization of receptor is well documented in literature. These interactions leading to dimeric/oligomers formation of receptors are known to modulate their function, particularly in case of G-protein coupled receptors. The opioid receptor heteromers having changed pharmacological properties than the constituent protomers provides preferences for novel drug targets that could lead to potential analgesic activity devoid of tolerance and physical dependence. Heterodimerization of opioid receptors appears to generate novel binding properties with improved specificity and lack of side effects. Further the molecules which can interact simultaneously to both the protomers of the heteromer, or to both the binding sites (orthosteric and allosteric) of a receptor protein could be potential therapeutic molecules. This review highlights the recent advancements in exploring the plausible role of heteromerization of opioid receptors in induction of tolerance free antinociception.
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Moulédous L, Mollereau C, Zajac JM. Opioid-modulating properties of the neuropeptide FF system. Biofactors 2010; 36:423-9. [PMID: 20803521 DOI: 10.1002/biof.116] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2010] [Accepted: 06/30/2010] [Indexed: 12/21/2022]
Abstract
Opioid receptors are involved in the control of pain perception in the central nervous system together with endogenous neuropeptides, termed opioid-modulating peptides, participating in a homeostatic system. Neuropeptide FF (NPFF) and related peptides possess anti-opioid properties, the cellular mechanisms of which are still unclear. The purpose of this review is to detail the phenomenon of cross-talk taking place between opioid and NPFF systems at the in vivo pharmacological level and to propose cellular and molecular models of functioning. A better knowledge of the mechanisms underlying opioid-modulating properties of NPFF has potential therapeutic interest for the control of opioid functions, notably for alleviating pain and/or for the treatment of opioid abuse.
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Affiliation(s)
- Lionel Moulédous
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR5089, Université de Toulouse, 205 route de Narbonne, Toulouse CEDEX 04, France
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18
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Moulédous L, Barthas F, Zajac JM. Opposite control of body temperature by NPFF1 and NPFF2 receptors in mice. Neuropeptides 2010; 44:453-6. [PMID: 20554321 DOI: 10.1016/j.npep.2010.05.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/10/2010] [Revised: 04/23/2010] [Accepted: 05/10/2010] [Indexed: 11/23/2022]
Abstract
Neuropeptide FF (NPFF) is a neurotransmitter known to modulate opioid functions. This study investigates the effects of RF9, a new antagonist of NPFF receptors, on the roles of NPFF1 and NPFF2 receptors in thermoregulation in mice. RF9 (10 nmol) injected into the third ventricle did not modify the body temperature as compared to saline, but it completely antagonized the hypothermic effects of 10 nmol NPVF, a NPFF1 selective agonist, as well as the hyperthermic actions of dNPA (5 nmol), a NPFF2 selective agonist. The use of a specific antagonist demonstrates here that central NPFF1 and NPFF2 receptors control in an opposite manner the body temperature in mice.
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Affiliation(s)
- Lionel Moulédous
- Institut de Pharmacologie et de Biologie Structurale, CNRS/Université de Toulouse, UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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Lameh J, Bertozzi F, Kelly N, Jacobi PM, Nguyen D, Bajpai A, Gaubert G, Olsson R, Gardell LR. Neuropeptide FF receptors have opposing modulatory effects on nociception. J Pharmacol Exp Ther 2010; 334:244-54. [PMID: 20354177 DOI: 10.1124/jpet.109.164384] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The role of neuropeptide FF (NPFF) and its analogs in pain modulation is ambiguous. Although NPFF was first characterized as an antiopioid peptide, both antinociceptive and pronociceptive effects have been reported, depending on the route of administration. Currently, two NPFF receptors, termed FF1 and FF2, have been identified and cloned, but their roles in pain modulation remain elusive because of the lack of availability of selective compounds suitable for systemic administration in in vivo models. Ligand-binding studies confirm ubiquitous expression of both subtypes in brain, whereas only FF2 receptors are expressed spinally. This disparity in localization has served as the foundation of the hypothesis that FF1 receptors mediate the pronociceptive actions of NPFF. We have identified novel small molecule NPFF receptor agonists and antagonists with varying degrees of FF2/FF1 functional selectivity. Using these pharmacological tools in vivo has allowed us to define the roles of NPFF receptor subtypes as pertains to the modulation of nociception. We demonstrate that selective FF2 agonism does not modulate acute pain but instead ameliorates inflammatory and neuropathic pains. Treatment with a nonselective FF1/FF2 agonist potentiates allodynia in neuropathic rats and increases sensitivity to noxious thermal and to non-noxious mechanical stimuli in normal rats in an FF1 antagonist-reversible manner. Treatment with FF1 antagonists reversed established mechanical allodynia, indicating the possibility of increased NPFF tone through FF1 receptors. In conclusion, we provide evidence for the opposing roles of NPFF receptors and highlight selective FF2 agonism and/or selective FF1 antagonism as potential targets warranting further investigation.
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Affiliation(s)
- Jelveh Lameh
- ACADIA Pharmaceuticals, Inc., San Diego, California, USA
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20
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Moulédous L, Frances B, Zajac JM. Modulation of basal and morphine-induced neuronal activity by a NPFF2 selective agonist measured by c-Fos mapping of the mouse brain. Synapse 2010; 64:672-81. [DOI: 10.1002/syn.20774] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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21
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Yamamoto T, Wada T, Miyazaki R. Analgesic effects of intrathecally administered 26RFa, an intrinsic agonist for GPR103, on formalin test and carrageenan test in rats. Neuroscience 2008; 157:214-22. [DOI: 10.1016/j.neuroscience.2008.08.061] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2008] [Revised: 08/02/2008] [Accepted: 08/31/2008] [Indexed: 10/21/2022]
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22
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Kotlinska J, Pachuta A, Silberring J. Neuropeptide FF (NPFF) reduces the expression of cocaine-induced conditioned place preference and cocaine-induced sensitization in animals. Peptides 2008; 29:933-9. [PMID: 18295932 DOI: 10.1016/j.peptides.2008.01.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2007] [Revised: 01/10/2008] [Accepted: 01/11/2008] [Indexed: 10/22/2022]
Abstract
The endogenous brain opioid system is believed to play an important role in mediating reward mechanisms. Opioid innervation is high in many limbic regions and reinforcing actions of many drugs of abuse, including cocaine, are thought to be mediated via endogenous opioid system. The aim of the present study was to indicate whether the anti-opioid peptide, neuropeptide FF (NPFF; FLFQPQRF-NH2) was able to modify the rewarding effect of cocaine (5 mg/kg) measured in the expression of conditioned place preference (CPP) test in rats and the expression of sensitization to hyperlocomotor effect of cocaine (10 mg/kg) in mice. Our results indicate that NPFF (5, 10, and 20 nmol) given intracerebroventricularly (i.c.v.) inhibited the expression of cocaine-induced CPP at the dose of 10 nmol (P<0.01) and 20 nmol (P<0.001). Moreover, NPFF inhibited the expression of cocaine-induced sensitization to its hyperlocomotor effect at the dose of 20 nmol (P<0.05) and acute hyperlocomotor effect of cocaine at doses of 5 nmol (P<0.01), 10 nmol (P<0.01), and 20 nmol (P<0.05). Our study suggests that NPFF may participate in a rewarding effect of cocaine measured in the CPP paradigm. On the other hand, our experiments indicate that NPFF is involved in the mechanism of expression of sensitization to cocaine hyperlocomotion but this effect seems to be non-specific because NPFF also inhibited the acute hyperlocomotor effect of cocaine.
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Affiliation(s)
- Jolanta Kotlinska
- Department of Pharmacology and Pharmacodynamics, Medical University School, Staszica 4, 20-081 Lublin, Poland.
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23
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Yang HYT, Tao T, Iadarola MJ. Modulatory role of neuropeptide FF system in nociception and opiate analgesia. Neuropeptides 2008; 42:1-18. [PMID: 17854890 DOI: 10.1016/j.npep.2007.06.004] [Citation(s) in RCA: 85] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2007] [Accepted: 06/14/2007] [Indexed: 10/22/2022]
Abstract
The tetra-peptide FMRF-NH(2) is a cardioexcitatory peptide in the clam. Using the antibody against this peptide, FMRF-NH(2)-like immunoreactive material was detected in mammalian CNS. Subsequently, mammalian FMRF-NH(2) immunoreactive peptides were isolated from bovine brain and characterized to be FLFQPQRF-NH(2) (NPFF) and AGEGLSSPFWSLAAPQRF-NH(2) (NPAF). The genes encoding NPFF precursor proteins and NPFF receptors 1 and 2 are expressed in all vertebrate species examined to date and are highly conserved. Among many biological roles suggested for the NPFF system, the possible modulatory role of NPFF in nocicetion and opiate analgesia has been most widely investigated. Pharmacologically, NPFF-related peptides were found to exhibit analgesia and also potentiate the analgesic activity of opiates when administered intrathecally but attenuate the opiate induced analgesia when administered intracerebroventricularly. RF-NH(2) peptides including NPFF-related peptides were found to delay the rate of acid sensing ion channels (ASIC) desensitization resulting in enhancing acid gated currents, raising the possibility that NPFF also may have a pain modulatory role through ASIC. The genes for NPFF as well as NPFF-R2, preferred receptor for NPFF, are highly unevenly expressed in the rat CNS with the highest levels localized to the superficial layers of the dorsal spinal cord. These two genes are also present in the dorsal root ganglia (DRG), though at low levels in normal rats. NPFF and NPFF-R2 mRNAs were found to be coordinately up-regulated in spinal cord and DRG of rats with peripheral inflammation. In addition, NPFF-R2 immunoreactivity in the primary afferents was increased by peripheral inflammation. The findings from the early studies on the analgesic and morphine modulating activities suggested a role for NPFF in pain modulation and this possibility is further supported by the distribution of NPFF and its receptor and the regulation of the NPFF system in vivo.
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Affiliation(s)
- Hsiu-Ying T Yang
- Neurobiology and Pain Therapeutics Section, National Institute of Dental and Craniofacial Research, NIH, Bethesda, MD 20892-4410, USA.
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24
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Abul-Husn NS, Sutak M, Milne B, Jhamandas K. Augmentation of spinal morphine analgesia and inhibition of tolerance by low doses of mu- and delta-opioid receptor antagonists. Br J Pharmacol 2007; 151:877-87. [PMID: 17502848 PMCID: PMC2014123 DOI: 10.1038/sj.bjp.0707277] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
BACKGROUND AND PURPOSE Ultralow doses of naltrexone, a non-selective opioid antagonist, have previously been found to augment acute morphine analgesia and block the development of tolerance to this effect. Since morphine tolerance is dependent on the activity of micro and delta receptors, the present study investigated the effects of ultralow doses of antagonists selective for these receptor types on morphine analgesia and tolerance in tests of thermal and mechanical nociception. EXPERIMENTAL APPROACH Effects of intrathecal administration of mu-receptor antagonists, CTOP (0.01 ng) or CTAP (0.001 ng), or a delta-receptor antagonist, naltrindole (0.01 ng), on spinal morphine analgesia and tolerance were evaluated using the tail-flick and paw-pressure tests in rats. KEY RESULTS Both micro and delta antagonists augmented analgesia produced by a sub-maximal (5 microg) or maximal (15 microg) dose of morphine. Administration of the antagonists with morphine (15 microg) for 5 days inhibited the progressive decline of analgesia and prevented the loss of morphine potency. In animals exhibiting tolerance to morphine, administration of the antagonists with morphine produced a recovery of the analgesic response and restored morphine potency. CONCLUSIONS AND IMPLICATIONS Combining ultralow doses of micro- or delta-receptor antagonists with spinal morphine augmented the acute analgesic effects, inhibited the induction of chronic tolerance and reversed established tolerance. The remarkably similar effects of micro- and delta-opioid receptor antagonists on morphine analgesia and tolerance are interpreted in terms of blockade of the latent excitatory effects of the agonist that limit expression of its full activity.
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Affiliation(s)
- N S Abul-Husn
- Department of Pharmacology and Toxicology, Queen's University Kingston, Ontario, Canada
| | - M Sutak
- Department of Pharmacology and Toxicology, Queen's University Kingston, Ontario, Canada
- Department of Anesthesiology, Queen's University Kingston, Ontario, Canada
| | - B Milne
- Department of Pharmacology and Toxicology, Queen's University Kingston, Ontario, Canada
- Department of Anesthesiology, Queen's University Kingston, Ontario, Canada
| | - K Jhamandas
- Department of Pharmacology and Toxicology, Queen's University Kingston, Ontario, Canada
- Department of Anesthesiology, Queen's University Kingston, Ontario, Canada
- Author for correspondence:
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Yudin YK, Tamarova ZA, Krishtal OA. Peripherally applied neuropeptide SF is equally algogenic in wild type and ASIC3−/− mice. Neurosci Res 2006; 55:421-5. [PMID: 16730827 DOI: 10.1016/j.neures.2006.04.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2005] [Revised: 04/18/2006] [Accepted: 04/21/2006] [Indexed: 11/18/2022]
Abstract
RFa-related peptides play a significant role in the processing of pain in the CNS of mammals. Recently it has been found that, when applied subcutaneously, these peptides elicit a powerful algogenic effect. The question arises whether this peripheral effect can be connected with the ability of RFa-related peptides to decrease the rate of desensitization of acid sensing ionic channels (ASICs) expressed in primary sensory neurons. We have addressed this question by comparing the effects of neuropeptide SF (NPSF), mammalian RFa peptide, in ASIC3-/- and wild-type C57BL/6J mice. Knockout of ASIC3 gene results in the changes in some of the behavioral parameters. However, subcutaneous injections of the NPSF into the n.saphenous innervation area result in a clearly nociceptive behavior in both strains of mice. There is no significant difference in the total time of licking of injected paw in the ASIC3-/- (194+/-22s) and C57BL/6J (227+/-25s) animals. Thus peripheral algogenic effects of NPSF cannot be explained only in terms of their action on the ASIC3 channels and involves some other, still unidentified mechanism.
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Affiliation(s)
- Yevgen K Yudin
- Bogomoletz Institute of Physiology, Bogomoletz Str. 4, 01024 Kiev, Ukraine.
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26
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Marchand S, Betourne A, Marty V, Daumas S, Halley H, Lassalle JM, Zajac JM, Frances B. A neuropeptide FF agonist blocks the acquisition of conditioned place preference to morphine in C57Bl/6J mice. Peptides 2006; 27:964-72. [PMID: 16494968 DOI: 10.1016/j.peptides.2005.07.023] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Accepted: 07/21/2005] [Indexed: 11/17/2022]
Abstract
Neuropeptide FF behaves as an opioid-modulating peptide that seems to be involved in morphine tolerance and physical dependence. Nevertheless, the effects of neuropeptide FF agonists on the rewarding properties of morphine remain unknown. C57BL6 mice were conditioned in an unbiased balanced paradigm of conditioned place preference to study the effect of i.c.v. injections of 1DMe (D-Tyr1(NMe)Phe3]NPFF), a stable agonist of the neuropeptide FF system, on the acquisition of place conditioning by morphine or alcohol (ethanol). Morphine (10 mg/kg, i.p.) or ethanol (2 g/kg, i.p.) induced a significant place preference. Injection of 1DMe (1-20 nmol), given 10 min before the i.p. injection of the reinforcing drug during conditioning, inhibited the rewarding effect of morphine but had no effect on the rewarding effect of ethanol. However, a single injection of 1DMe given just before place preference testing was unable to inhibit the rewarding effects of morphine. By itself, 1DMe was inactive but an aversive effect of this agonist could be evidenced if the experimental procedure was biased. These results suggest that neuropeptide FF, injected during conditioning, should influence the development of rewarding effects of morphine and reinforce the hypothesis of strong inhibitory interactions between neuropeptide FF and opioids.
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Affiliation(s)
- Stéphane Marchand
- Centre de Recherches sur la Cognition Animale, CNRS UMR 5169, Bât 4R3 b3, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 4, France
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27
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Jhamandas K, Milne B, Sutak M, Gouarderes C, Zajac JM, Yang HYT. Facilitation of spinal morphine analgesia in normal and morphine tolerant animals by neuropeptide SF and related peptides. Peptides 2006; 27:953-63. [PMID: 16515821 DOI: 10.1016/j.peptides.2005.09.017] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/08/2005] [Accepted: 09/16/2005] [Indexed: 11/24/2022]
Abstract
Neuropeptide FF and related synthetic amidated peptides have been shown to elicit sustained anti-nociceptive responses and potently augment spinal anti-nociceptive actions of spinal morphine in tests of thermal and mechanical nociception. Recent studies have described the occurrence of another octapeptide, neuropeptide SF (NPSF) in the spinal cord and the cerebrospinal fluid and demonstrated its affinity for the NPFF receptors. This study examined the effects of NPSF and two putative precursor peptides, EFW-NPSF and NPAF, on the spinal actions of morphine in normal and opioid tolerant rats using the tailflick and pawpressure tests. In normal rats, NPSF demonstrated weak intrinsic activity but sub-effective doses of the peptide significantly increased the magnitude and duration of spinal morphine anti-nociception in both tests. A low-dose of NPSF also augmented the spinal actions of a delta receptor agonist, deltorphin. The morphine-potentiating effect of NPSF was shared by EFW-NPSF and the octadecapeptide NPAF. In animal rendered tolerant by continuous intrathecal infusion of morphine for 6 days, low dose NPSF itself elicited a significant anti-nociceptive response and potently increased morphine-induced response in both tests. In animals made tolerant by repeated injections of intrathecal morphine, administration of NPSF, EFW-NPSF, and NPAF with morphine reversed the loss of the anti-nociceptive effect and restored the agonist potency. The results demonstrate that in normal animals NPSF and related peptides exert strong potentiating effect on morphine anti-nociception at the spinal level and in tolerant animals these agents can reverse the loss of morphine potency.
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Affiliation(s)
- K Jhamandas
- Department of Pharmacology and Toxicology and Department of Anesthesiology, Faculty of Health Sciences, Queen's University, Kingston, Ont., Canada K7L 3N6.
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McGaraughty S, Honore P, Wismer CT, Mikusa J, Zhu CZ, McDonald HA, Bianchi B, Faltynek CR, Jarvis MF. Endogenous opioid mechanisms partially mediate P2X3/P2X2/3-related antinociception in rat models of inflammatory and chemogenic pain but not neuropathic pain. Br J Pharmacol 2005; 146:180-8. [PMID: 16041397 PMCID: PMC1576275 DOI: 10.1038/sj.bjp.0706346] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
P2X3/P2X2/3 receptors have emerged as important components of nociception. However, there is limited information regarding the neurochemical systems that are affected by antagonism of the P2X3/P2X2/3 receptor and that ultimately contribute to the ensuing antinociception. In order to determine if the endogenous opioid system is involved in this antinociception, naloxone was administered just prior to the injection of a selective P2X3/P2X2/3 receptor antagonist, A-317491, in rat models of neuropathic, chemogenic, and inflammatory pain. Naloxone (1-10 mg kg(-1), i.p.), dose-dependently reduced the antinociceptive effects of A-317491 (1-300 micromol kg(-1), s.c.) in the CFA model of thermal hyperalgesia and the formalin model of chemogenic pain (2nd phase), but not in the L5-L6 spinal nerve ligation model of neuropathic allodynia. In comparison experiments, the same doses of naloxone blocked or attenuated the actions of morphine (2 or 8 mg kg(-1), s.c.) in each of these behavioral models. Injection of a peripheral opioid antagonist, naloxone methiodide (10 mg kg(-1), i.p.), did not affect A-317491-induced antinociception in the CFA and formalin assays, suggesting that the opioid component of this antinociception occurred within the CNS. Furthermore, this utilization of the central opioid system could be initiated by antagonism of spinal P2X3/P2X2/3 receptors since the antinociceptive actions of intrathecally delivered A-317491 (30 nmol) in the formalin model were reduced by both intrathecally (10-50 nmol) and systemically (10 mg kg(-1), i.p.) administered naloxone. This utilization of the opioid system was not specific to A-317491 since suramin-, a nonselective P2X receptor antagonist, induced antinociception was also attenuated by naloxone. In in vitro studies, A-317491 (3-100 microM) did not produce any agonist response at delta opioid receptors expressed in NG108-15 cells. A-317491 had been previously shown to be inactive at the kappa and mu opioid receptors. Furthermore, naloxone, at concentrations up to 1 mM, did not compete for [3H] A-317491 binding in 1321N1 cells expressing human P2X3 receptors. Taken together, these results indicate that antagonism of spinal P2X3/P2X2/3 receptors results in an indirect activation of the opioid system to alleviate inflammatory hyperalgesia and chemogenic nociception.
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Affiliation(s)
- Steve McGaraughty
- Neuroscience Research, Global Pharmaceutical Research and Development, Abbott Laboratories, R4PM, AP9-1, 100 Abbott Park Road, Abbott Park, IL 60064, U.S.A.
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29
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Ankö ML, Panula P. Regulation of endogenous human NPFF2 receptor by neuropeptide FF in SK-N-MC neuroblastoma cell line. J Neurochem 2005; 96:573-84. [PMID: 16336216 DOI: 10.1111/j.1471-4159.2005.03581.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Neuropeptide FF has many functions both in the CNS and periphery. Two G protein-coupled receptors (NPFF1 and NPFF2 receptors) have been identified for neuropeptide FF. The expression analysis of the peptide and receptors, together with pharmacological and physiological data, imply that NPFF2 receptor would be the primary receptor for neuropeptide FF. Here, we report for the first time a cell line endogenously expressing hNPFF2 receptor. These SK-N-MC neuroblastoma cells also express neuropeptide FF. We used the cells to investigate the hNPFF2 receptor function. The pertussis toxin-sensitive inhibition of adenylate cyclase activity upon receptor activation indicated coupling to Gi/o proteins. Upon agonist exposure, the receptors were internalized and the mitogen-activated protein kinase cascade was activated. Upon neuropeptide FF treatment, the actin cytoskeleton was reorganized in the cells. The expression of hNPFF2 receptor mRNA was up-regulated by neuropeptide FF. Concomitant with the receptor mRNA, the receptor protein expression was increased. The homologous regulation of hNPFF2 receptor correlates with our previous results in vivo showing that during inflammation, the up-regulation of neuropeptide FF mRNA precedes that of NPFF2 receptor. The regulation of hNPFF2 receptor by NPFF could also be important in the periphery where neuropeptide FF has been suggested to function as a hormone.
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Affiliation(s)
- Minna-Liisa Ankö
- Department of Biology, Abo Akademi University, Tykistökatu, Turku, Finland
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30
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Roussin A, Serre F, Gouardères C, Mazarguil H, Roumy M, Mollereau C, Zajac JM. Anti-analgesia of a selective NPFF2 agonist depends on opioid activity. Biochem Biophys Res Commun 2005; 336:197-203. [PMID: 16129413 DOI: 10.1016/j.bbrc.2005.08.060] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2005] [Accepted: 08/07/2005] [Indexed: 12/26/2022]
Abstract
NPFF agonists designed to be selective NPFF(2) receptor probes were synthesized. D.Asn-Pro-(N-Me)Ala-Phe-Leu-Phe-Gln-Pro-Gln-Arg-Phe-NH(2) (dNPA) displays a very high affinity (0.027nM) for NPFF(2) receptors transfected in CHO cells, and a very high selectivity with a discrimination ratio greater than 100 versus NPFF(1) receptors. dNPA acts as a potent and selective agonist in [(35)S]GTPgammaS binding experiments and inhibits intracellular cAMP production with the same efficacy as NPA-NPFF. In SH-SY5Y cells expressing NPFF(2) receptors dNPA, in the presence of carbachol, stimulates Ca(2+) release from the intracellular stores. In vivo, after intracerebroventricular injection dNPA increases body temperature in mice and reverses the morphine-induced analgesia. Also, dNPA displays anti-opioid activity after systemic administration. So far, dNPA exhibits the highest affinity and selectivity for NPFF(2) receptors and reveals that its behavioral anti-opioid activity depends on the degree of opioid-induced analgesia.
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Affiliation(s)
- Anne Roussin
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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31
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Pertovaara A, Ostergård M, Ankö ML, Lehti-Koivunen S, Brandt A, Hong W, Korpi ER, Panula P. RFamide-related peptides signal through the neuropeptide FF receptor and regulate pain-related responses in the rat. Neuroscience 2005; 134:1023-32. [PMID: 16039797 DOI: 10.1016/j.neuroscience.2005.04.050] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2004] [Revised: 04/13/2005] [Accepted: 04/22/2005] [Indexed: 12/20/2022]
Abstract
The mammalian RFamide-related peptide RFRP1 was found to signal through the neuropeptide FF 2 receptor expressed in Xenopus oocytes. The peptide induced a dose-dependent outward current, which was dependent on the simultaneous expression of GIRK1 and GIRK4 potassium channels. In neuropathic rats, RFRP1 administered intrathecally induced tactile antiallodynia and thermal antinociception, whereas in the solitary tract nucleus it produced only mechanical antihyperalgesia. Expression of the RFamide-related peptide mRNA in the rat CNS was distinctly different from that of neuropeptide FF. Most notably, the gene was not expressed in the hindbrain or spinal cord at detectable levels. However, there was a prominent group of RFamide-related peptide mRNA-expressing neurons in the central hypothalamus, in the area in and between the dorsomedial and ventromedial nuclei. The results suggest that RFamide-related peptides are potentially involved in pain regulation through a hypothalamo-medullary projection system, and possibly via action on neuropeptide FF 2 receptors. In neuropathic animals, the pain suppressive effect of RFamide-related peptide varies depending on the submodality of noxious test stimulation and the site of RFamide-related peptide administration.
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Affiliation(s)
- A Pertovaara
- Department of Physiology, University of Turku, Turku, Finland.
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32
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Ukena K, Tsutsui K. A new member of the hypothalamic RF-amide peptide family, LPXRF-amide peptides: structure, localization, and function. MASS SPECTROMETRY REVIEWS 2005; 24:469-486. [PMID: 15389843 DOI: 10.1002/mas.20031] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Recently, we identified a novel hypothalamic neuropeptide with a C-terminal LPLRF-amide sequence in the quail brain. This avian neuropeptide was shown to inhibit gonadotropin release from the cultured anterior pituitary. This peptide is the first hypothalamic peptide that inhibited gonadotropin release reported in vertebrates. We, therefore, termed it gonadotropin-inhibitory hormone (GnIH). After this finding, we found that GnIH-related peptides were present in the brains of other vertebrates, such as mammals, amphibians, and fish. These GnIH-related peptides possessed a LPXRF-amide (X=L or Q) motif at their C-termini in all investigated animals. Mass spectrometric analyses combined with immunoaffinity chromatography were powerful techniques for the identification of mature endogenous LPXRF-amide peptides. The identified LPXRF-amide peptides were found to be localized in the hypothalamus and brainstem areas, and to regulate pituitary hormone release. Subsequently, cDNAs that encode LPXRF-amide peptides were characterized in vertebrate brains. In this review, we summarize the identification, localization, and function of a new member of the hypothalamic RF-amide peptide family, LPXRF-amide peptides in vertebrates. Recent studies on the receptors for LPXRF-amide peptides will also be reviewed.
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Affiliation(s)
- Kazuyoshi Ukena
- Laboratory of Brain Science, Faculty of Integrated Arts and Sciences, Hiroshima University, Higashi-Hiroshima 739-8521, Japan.
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33
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Änkö ML, Panula P. Functional modulation of human delta opioid receptor by neuropeptide FF. BMC Neurosci 2005; 6:21. [PMID: 15804369 PMCID: PMC1079869 DOI: 10.1186/1471-2202-6-21] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2004] [Accepted: 04/04/2005] [Indexed: 12/01/2022] Open
Abstract
Background Neuropeptide FF (NPFF) plays a role in physiological pain sensation and opioid analgesia. For example, NPFF potentiates opiate-induced analgesia and the delta opioid receptor antagonist naltrindole inhibits NPFF-induced antinociception. The nature of the interactions between NPFF and opioid receptors seems to be complex and the molecular mechanisms behind the observed physiological effects are not known. Results We used a stable Chinese hamster ovary cell line expressing c-MYC-tagged human delta opioid receptor to study the interactions at the molecular level. Our results imply that NPFF can directly modulate the activation of delta opioid receptor in the absence of NPFF receptors. The modulatory effect, though only moderate, was consistently detected with several methods. The agonist-induced receptor trafficking was changed in the presence of (1DMe)NPYF, a stable NPFF-analogue. (1DMe)NPYF enhanced the receptor activation and recovery; opioid antagonists inhibited the effects, indicating that they were delta opioid receptor-mediated. The binding experiments with a novel ligand, Terbium-labeled deltorphin I, showed that (1DMe)NPYF modulated the binding of delta opioid receptor ligands. The levels of phosphorylated mitogen-activated protein kinase and intracellular cAMP were studied to clarify the effects of NPFF on the opioid signaling mechanisms. Application of (1DMe)NPYF together with a delta opioid receptor agonist enhanced the signaling via both pathways studied. Concomitantly to the receptor trafficking, the time-course of the activation of the signaling was altered. Conclusion In addition to working via indirect mechanisms on the opioid systems, NPFF may exert a direct modulatory effect on the delta opioid receptor. NPFF may be a multi-functional neuropeptide that regulates several neuronal systems depending on the site of action.
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Affiliation(s)
- Minna-Liisa Änkö
- Department of Biology, Åbo Akademi University, Tykistökatu 6A, 2nd floor, FI-20520 Turku, Finland
| | - Pertti Panula
- Department of Biology, Åbo Akademi University, Tykistökatu 6A, 2nd floor, FI-20520 Turku, Finland
- Neuroscience Center and Institute of Biomedicine/Anatomy, University of Helsinki, Haartmaninkatu 8, FI-00014 University of Helsinki, Finland
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Quelven I, Roussin A, Zajac JM. Comparison of pharmacological activities of Neuropeptide FF1 and Neuropeptide FF2 receptor agonists. Eur J Pharmacol 2005; 508:107-14. [PMID: 15680260 DOI: 10.1016/j.ejphar.2004.12.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2004] [Revised: 11/30/2004] [Accepted: 12/06/2004] [Indexed: 11/23/2022]
Abstract
The pharmacological effects of Neuropeptide FF (NPFF) analogs exhibiting different selectivities towards Neuropeptide FF1 (NPFF1) and Neuropeptide FF2 (NPFF2) receptors were investigated after supraspinal administration in mice. Injected into the third ventricle, VPNLPQRF-NH2, which is selective for Neuropeptide FF1 receptor induced a hypothermia while EFWSLAAPQRF-NH2 and SPAFLFQPQRF-NH2 which are selective for Neuropeptide FF2 receptor, did not. Furthermore, EFWSLAAPQRF-NH2 significantly increased the body temperature when compared to saline treated mice, indicating that Neuropeptide FF1 receptor could be responsible for hypothermia while Neuropeptide FF2 mediated an hyperthermic effect. After administration into the lateral ventricle, 1DMe ([D.Tyr1,(N.Me)Phe3]NPFF), a weakly selective Neuropeptide FF2 receptor agonist, exerted a clear anti-opioid effect in the tail flick test. The selective Neuropeptide FF1 receptor agonist VPNLPQRF-NH2 did not induce significant anti-opioid actions but rather increased, dose-dependently, morphine analgesia while EFWSLAAPQRF-NH2, the highest selective Neuropeptide FF2 receptor analog, induced the same pharmacological effect as VPNLPQRF-NH2 at comparable doses. These features indicate that the pro- and anti-opioid actions are not strictly related to the selectivity towards Neuropeptide FF2 or Neuropeptide FF1 receptor. Our data demonstrate that Neuropeptide FF1 and Neuropeptide FF2 receptors differently modulate nervous system functions.
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Affiliation(s)
- Isabelle Quelven
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 route de Narbonne, 31077 Toulouse Cedex, France
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35
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Gouardères C, Faura CC, Zajac JM. Rodent strain differences in the NPFF1 and NPFF2 receptor distribution and density in the central nervous system. Brain Res 2004; 1014:61-70. [PMID: 15212992 DOI: 10.1016/j.brainres.2004.04.005] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2004] [Indexed: 11/25/2022]
Abstract
The present study evaluates the putative differences between NPFF1 and NPFF2 receptor distribution and density throughout the central nervous system between rat and mouse strains by using in vitro quantitative autoradiography. The binding of [125I]YVP ([125I]YVPNLPQRF-NH2) and [125I]EYF ([125I]EYWSLAAPQRF-NH2), used to label NPFF1 and NPFF2 receptors, respectively, was compared between Sprague-Dawley and Wistar rats and between Swiss and C57BL/6-SV129 mice. In contrast to Wistar, Sprague-Dawley brains contained NPFF1 binding sites in the cortical and spinal cord areas, the accumbens nucleus, the anterodorsal thalamic nucleus, the parafascicular thalamic nucleus, the inferior colliculus and the nucleus of the solitary tract. The distribution of NPFF2 binding sites was also different between the two strains of rats. As compared to Swiss, C57BL/6-SV129 mice showed higher basal NPFF2 receptor levels in cortical areas, telencephalon and some other regions. In contrast, they showed lower amounts in thalamic structures, except the reuniens nucleus, and in mesencephalic and rhombencephalic regions. In the cervical spinal cord the levels of NPFF2 receptors were similar. The NPFF1 binding levels were nearly the same in telencephalic structures while distinct in the forebrain. Differences in amount of NPFF receptor subtypes among these strains of rats or mice could lead to differences in NPFF control of opioid nociception.
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Affiliation(s)
- C Gouardères
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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36
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Gouardères C, Kieffer BL, Zajac JM. Opposite alterations of NPFF1 and NPFF2 neuropeptide FF receptor density in the triple MOR/DOR/KOR-opioid receptor knockout mouse brains. J Chem Neuroanat 2004; 27:119-28. [PMID: 15121216 DOI: 10.1016/j.jchemneu.2004.01.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2003] [Revised: 12/01/2003] [Accepted: 01/21/2004] [Indexed: 11/23/2022]
Abstract
Mice lacking the mu-delta-kappa-opioid receptor (MOR/DOR/KOR) genes and their corresponding wild-type littermates have been used to quantify NPFF(1) and NPFF(2) (neuropeptide FF) receptors by in vitro autoradiography in the central nervous tissues. Adjacent coronal sections were labelled with [125I]YVP ([125I]YVPNLPQRF-NH(2)) and [125I]EYF ([125I]EYWSLAAPQRF-NH(2)) as specific radioligands for NPFF(1) and NPFF(2) receptors, respectively. NPFF(2) receptors are predominantly expressed in both genotypes, but their density increases significantly in non cortical regions of mutant mice: 64% in the amygdaloid area, 89, 308, 1214 and 49% in the nucleus of the vertical limb of the diagonal band, substantia nigra, the vestibular nucleus and the spinal cord, respectively. In contrast, the density of the NPFF(1) subtype is lower than NPFF(2) in both genotypes and significantly decreased in some brain areas of mutant mice: -99, -90 and -90% in the nucleus of the vertical limb of the diagonal band, substantia nigra and the spinal cord, respectively. This study shows that mice lacking opioid receptors have brain region-dependent increases (NPFF(2)) and decreases (NPFF(1)) in NPFF receptors densities and suggests a different functional participation of each NPFF receptor subtype in the actions of opioids.
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MESH Headings
- Animals
- Autoradiography
- Brain/anatomy & histology
- Brain/metabolism
- Mice
- Mice, Knockout
- Receptors, Neuropeptide/metabolism
- Receptors, Opioid/deficiency
- Receptors, Opioid/genetics
- Receptors, Opioid, delta/deficiency
- Receptors, Opioid, delta/genetics
- Receptors, Opioid, kappa/deficiency
- Receptors, Opioid, kappa/genetics
- Receptors, Opioid, mu/deficiency
- Receptors, Opioid, mu/genetics
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Affiliation(s)
- Christine Gouardères
- Institut de Pharmacologie et de Biologie Structurale, C.N.R.S. UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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37
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Gouardères C, Puget A, Zajac JM. Detailed distribution of neuropeptide FF receptors (NPFF1 and NPFF2) in the rat, mouse, octodon, rabbit, guinea pig, and marmoset monkey brains: a comparative autoradiographic study. Synapse 2004; 51:249-69. [PMID: 14696013 DOI: 10.1002/syn.10305] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The distribution of neuropeptide FF receptors (NPFF(1) and NPFF(2)) was analyzed throughout the central nervous system of rodents (rat, mouse, Octodon degus, and guinea pig), rabbit, and marmoset monkey brains, representing three orders of mammals. Quantitative in vitro receptor autoradiography with [(125)I]EYF ([(125)I]EYWSLAAPQRF-NH(2)) and [(125)I]YVP ([(125)I]YVPNLPQRF-NH(2)) as specific radioligands for NPFF(2) and NPFF(1) receptors, respectively, was used. The NPFF(2) receptor is predominantly expressed in all species, except in the central nervous system of Octodon degus, in which it is undetectable. The density of the NPFF(1) subtype is low in rat and mice, moderate in octodon, rabbit, and monkey, and relatively high in the guinea pig. The present study reveals prominent species differences in the NPFF receptors expression in the brain. The distribution pattern of NPFF(2) receptors in the diencephalon and the superficial layers of the spinal cord is consistent with a hypothesized potential role for NPFF in the modulation of sensory input and opioid analgesia. In contrast, the constant presence of NPFF(1) receptors in the septum, the nucleus of the tractus solitarius, and the hypothalamus suggest its participation in neuroendocrine functions.
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Affiliation(s)
- Christine Gouardères
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 31077 Toulouse Cedex, France
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38
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Quelven I, Roussin A, Zajac JM. Functional consequences of neuropeptide FF receptors stimulation in mouse: a cerebral glucose uptake study. Neuroscience 2004; 126:441-9. [PMID: 15207362 DOI: 10.1016/j.neuroscience.2004.03.052] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/10/2004] [Indexed: 11/25/2022]
Abstract
The brain substrates involved in the pharmacological effects of neuropeptide FF (NPFF, Phe-Leu-Phe-Gln-Pro-Gln-Arg-Phe-NH2) including interactions with opioid systems, were investigated with the [14C]-2-deoxyglucose ([14C]-2-DG) autoradiography technique in mouse. The changes in cerebral activity were mapped after i.p. administration of 1DMe ([D-Tyr1,(NMe)Phe3]NPFF; 70 mg/kg), a neuropeptide FF analogue partially resistant to peptidases, alone or in combination with morphine (15 mg/kg). 1DMe induced a rapid decrease in the cerebral activity in the thalamus, the pontine reticular nuclei and the cerebellar cortex, brain regions involved in the control of motor activity and/or the processing of sensory data. This decrease, observed when 1DMe was administered 5 min before [14C]-2-DG, was reversed by morphine, which was devoid of significant effect at this time. When administered 30 min before the radioisotope, 1DMe was without effect, whereas morphine induced a significant increase in cerebral glucose utilization in the caudate putamen, the primary somatosensory cortex, the thalamus, the superior colliculus, the pontine reticular nuclei and the spinal cord. The association of morphine and 1DMe significantly increased cerebral glucose utilization in the same regions as morphine alone and also in three additional regions: the auditory cortex, the inferior colliculus and the dorsomedial periaqueductal gray. Following systemic administration, 1DMe and morphine modulated cerebral activity in brain regions involved in pain transmission and motor control, but their effects were temporally shifted, as were their effects on horizontal locomotor activity. However, neuropeptide FF-induced changes in brain activity were modulated in part by opioid receptors activation.
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Affiliation(s)
- I Quelven
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 route de Narbonne, 31077 Toulouse Cedex, France
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39
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Nicklous DM, Simansky KJ. Neuropeptide FF exerts pro- and anti-opioid actions in the parabrachial nucleus to modulate food intake. Am J Physiol Regul Integr Comp Physiol 2003; 285:R1046-54. [PMID: 14557236 DOI: 10.1152/ajpregu.00107.2003] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Neurons that synthesize the morphine modulatory peptide neuropeptide FF (NPFF; Phe-Leu-Phe-Gln-Pro-Gln-Arg-Phe-NH2) densely innervate the parabrachial nucleus (PBN), an area implicated in regulating food intake. We analyzed opioid-related actions of NPFF in feeding in adult male Sprague-Dawley rats. Unilateral infusion of 2 nmol/0.5 microl of the mu-opioid receptor agonist [d-Ala2,NMe-Phe4,glycinol5]enkephalin (DAMGO) into the lateral PBN increased 4-h food intake from 0.7 +/- 0.1 to 3.3 +/- 0.3 g. NPFF (1.25-5.0 nmol) prevented this hyperphagic mu-opioidergic action. In rats fed after 4-h deprivation (baseline = 12.3 +/- 0.3 g/2 h), 5 nmol of NPFF did not alter and larger doses (10 and 20 nmol) actually increased food intake (+36, 54%). Twenty nanomoles also elevated intake of freely feeding rats (from 0.7 +/- 0.1 to 5.1 +/- 1.0 g/4 h). The opioid receptor blocker naloxone (10 nmol) antagonized this increase. These data reveal both pro- and anti-opioid actions of NPFF in the PBN to modulate feeding. The mechanisms for the opposite actions of low and high concentrations of this neuropeptide in parabrachial regulation of food intake remain to be determined.
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Affiliation(s)
- Danielle M Nicklous
- Dept. of Pharmacology and Physiology, Drexel Univ. College of Medicine, Mailstop 488, 245 N. 15th St., Philadelphia, PA 19102-1192, USA
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40
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Bonnard E, Burlet-Schiltz O, Monsarrat B, Girard JP, Zajac JM. Identification of proNeuropeptide FFA peptides processed in neuronal and non-neuronal cells and in nervous tissue. ACTA ACUST UNITED AC 2003; 270:4187-99. [PMID: 14519131 DOI: 10.1046/j.1432-1033.2003.03816.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Peptides which should be generated from the neuropeptide FF (NPFF) precursor were identified in a neuronal (human neuroblastoma SH-SY5Y) cell line and in COS-7 cells after transient transfection of the human proNPFFA cDNA and were compared with those detected in the mouse spinal cord. After reverse-phase high performance liquid chromatography of soluble material, NPFF-related peptides were immunodetected with antisera raised against NPFF and identified by using on-line capillary liquid chromatography/nanospray ion trap tandem mass spectrometry. Neuronal and non-neuronal cells generated different peptides from the same precursor. In addition to NPFF, SQA-NPFF (Ser-Gln-Ala-Phe-Leu-Phe-Gln-Pro-Gln-Arg-Phe-amide) and NPAF were identified in the human neuroblastoma while only NPFF was clearly identified in COS-7 cells. In mouse, in addition to previously detected NPFF and NPSF, SPA-NPFF (Ser-Pro-Ala-Phe-Leu-Phe-Gln-Pro-Gln-Arg-Phe-amide), the homologous peptide of SQA-NPFF, were characterized. These data on intracellular processing of proNeuropeptide FFA are discussed in regard to the known enzymatic processing mechanisms.
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Affiliation(s)
- Elisabeth Bonnard
- Institut de Pharmacologie et de Biologie Structurale, Toulouse, France
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41
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Yang HYT, Iadarola MJ. Activation of spinal neuropeptide FF and the neuropeptide FF receptor 2 during inflammatory hyperalgesia in rats. Neuroscience 2003; 118:179-87. [PMID: 12676148 DOI: 10.1016/s0306-4522(02)00931-4] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Several lines of evidence suggest that neuropeptide FF (NPFF) is involved in nociception and in the modulation of opioid-mediated analgesia. Following the identification of the precursor protein for NPFF, two NPFF receptors and a second PQRF-NH(2) containing peptide, termed NPVF, were identified. To further explore the functional role of PQRF-NH(2) peptides, we have studied their distribution and also the regulation of NPFF and NPVF systems in the spinal cord of rats with peripheral inflammation. The distribution of NPFF gene expression is very similar to that of NPFF immunoreactive peptide but is distinct from NPVF gene expression. In the rat spinal cord, gene expression of NPFF but not that of NPVF was up-regulated by persistent pain induced by carrageenan inflammation. The distribution of NPFF receptor 2 gene expression is very similar to that of the NPFF peptide with a striking localization in the superficial layer of spinal cord. In rats with carrageenan inflammation of the hind paw, expression of both NPFF and NPFF receptor 2 genes was up-regulated in the spinal cord, while expression of NPVF and NPFF receptor 1 genes was not affected. The results of this study demonstrate a coordinated involvement of the spinal NPFF system in the persistent nociceptive pain states. Several studies have found a potentiation and prolongation of morphine analgesia by NPFF, therefore, it is highly possible that the endogenous spinal NPFF system contributes to the enhanced analgesic potency of morphine in animals with peripheral inflammation.
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Affiliation(s)
- H-Y T Yang
- Neuronal Gene Expression Unit, Pain and Neurosensory Mechanisms Branch, National Institute of Dental and Craniofacial Research, National Institutes of Health, Bethesda, MD 20892-4410, USA.
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Zeng Z, McDonald TP, Wang R, Liu Q, Austin CP. Neuropeptide FF receptor 2 (NPFF2) is localized to pain-processing regions in the primate spinal cord and the lower level of the medulla oblongata. J Chem Neuroanat 2003; 25:269-78. [PMID: 12842272 DOI: 10.1016/s0891-0618(03)00038-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Studies have suggested that NPFF-like peptides and their receptors play important roles in physiological and pathological conditions. Here, we show, using multiple expression modalities, that the type 2 NPFF receptor (hNPFF2) is expressed in regions of the primate spinal cord and brainstem mediating pain sensation. In situ hybridization using an NPFF2 riboprobe, and immunohistochemistry using a novel NPFF2 antibody, demonstrated strong NPFF2 expression in the superficial layer of the dorsal horn, and in the spinal trigeminal nucleus of the brainstem of the African green monkey (AGM). In addition, autoradiography using a radiolabeled NPFF analog ([125I]1DMe) revealed dense binding signal in the superficial layer of the dorsal horn in the spinal cord. The distribution pattern of hNPFF2 in the AGM spinal cord and the lower level of the brainstem are consistent with a hypothesized potential role for NPFF peptides in modulation of sensory input, opioid analgesia and morphine tolerance through spinal and supraspinal mechanisms.
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Affiliation(s)
- Zhizhen Zeng
- Department of Neuroscience, Merck Research Laboratories, WP26A-3000, P.O. Box 4, West Point, PA 19486, USA.
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Kanetoh T, Sugikawa T, Sasaki I, Muneoka Y, Minakata H, Takabatake I, Fujimoto M. Identification of a novel frog RFamide and its effect on the latency of the tail-flick response of the newt. Comp Biochem Physiol C Toxicol Pharmacol 2003; 134:259-66. [PMID: 12600686 DOI: 10.1016/s1532-0456(02)00277-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Neuropeptide FF, one of the mammalian PQRFamides, has been reported to affect the latency of the tail-flick response in rat. We intended to examine the nociceptive effect by the peptide PQRFamides from the comparative aspect. Using the dot immunoblot method with antiserum to FMRFamide as an assay system, a peptide (frog's nociception-related peptide, fNRP) which has the C-terminal sequence PQRFamide was isolated from the brain of the frog, Rana catesbeiana. The determined sequence, SIPNLPQRF-NH(2), is the same as that named first (frog growth hormone-releasing peptide-gene-related peptide-1: fGRP-RP-1, which is encoded in the cDNA of the fGRP precursor. Since the peptide was isolated from the frog brain, we tested another amphibian, the newt, which has a tail, by the hot beam tail-flick test. Intraperitoneal injection of fNRP significantly increased the latency of the pain response (tail-flick) 90 min after administration. The effect was blocked by simultaneous administration of 5 mM naloxone. The result provides evidence for the interaction of fNRP and opioid steps in the analgesia pathways in the newt.
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Affiliation(s)
- Tomokazu Kanetoh
- Department of Biological Science, Faculty of Life and Environmental Science, Shimane-University, 1060 Nishikawatsu-cho, Matsue 690-8504, Japan
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Gouardères C, Quelven I, Mollereau C, Mazarguil H, Rice SQJ, Zajac JM. Quantitative autoradiographic distribution of NPFF1 neuropeptide FF receptor in the rat brain and comparison with NPFF2 receptor by using [125I]YVP and [(125I]EYF as selective radioligands. Neuroscience 2003; 115:349-61. [PMID: 12421602 DOI: 10.1016/s0306-4522(02)00419-0] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The selectivity of two new radioligands, [(125)I]YVP ([(125)I]YVPNLPQRF-NH(2)) and [(125)I]EYF ([(125)I]EYWSLAAPQRF-NH(2)), for neuropeptide FF (NPFF) receptor subtypes was determined using HEK293 cells expressing hNPFF(1) and CHO cells expressing hNPFF(2) receptors. Saturation binding and displacement experiments showed that [(125)I]YVP and [(125)I]EYF bound selectively with a very high affinity, K(D)=0.18 nM and 0.06 nM, to NPFF(1) and NPFF(2) receptors respectively. By using in vitro autoradiography with these radioligands and frog pancreatic polypeptide (PP) as selective unlabelled competitor of NPFF(2) binding sites, NPFF(1) and NPFF(2) receptor distribution was analyzed throughout the rat CNS. The highest densities of [(125)I]EYF binding sites were seen in the most external layers of the dorsal horn of the spinal cord, the parafascicular thalamic nucleus, laterodorsal thalamic nucleus and presubiculum of hippocampus. All specific binding of this radioligand was inhibited by 200 nM frog PP. The density of 0.1 nM [(125)I]YVP binding was much smaller in all brain areas and frog PP-insensitive binding sites (NPFF(1) receptor subtype) were detected in septal, thalamic and hypothalamic areas but were absent in the spinal cord. The restricted distribution of NPFF(1) receptors in the CNS supports its specific role in a limited number of neuronal functions. In contrast to the rat spinal cord where the NPFF(1) system is absent, there is no strict separation between NPFF(1) and NPFF(2) system at the supraspinal level.
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Affiliation(s)
- C Gouardères
- Institut de Pharmacologie et de Biologie Structurale, C.N.R.S. UMR 5089, 205 Route de Narbonne, 31077 Toulouse Cedex, France
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Mollereau C, Mazarguil H, Marcus D, Quelven I, Kotani M, Lannoy V, Dumont Y, Quirion R, Detheux M, Parmentier M, Zajac JM. Pharmacological characterization of human NPFF1 and NPFF2 receptors expressed in CHO cells by using NPY Y1 receptor antagonists. Eur J Pharmacol 2002; 451:245-56. [PMID: 12242085 DOI: 10.1016/s0014-2999(02)02224-0] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Neuropeptide FF (NPFF) belongs to an opioid-modulatory system including two precursors (pro-NPFF(A) and pro-NPFF(B)) and two G-protein coupled receptors (NPFF(1) and NPFF(2)). The pharmacological and functional profiles of human NPFF(1) and NPFF(2) receptors expressed in Chinese hamster ovary (CHO) cells were compared by determining the affinity of several peptides derived from both NPFF precursors and by measuring their abilities to inhibit forskolin-induced cAMP accumulation. Each NPFF receptor recognizes peptides from both precursors with nanomolar affinities, however, with a slight preference of pro-NPFF(A) peptides for NPFF(2) receptors and of pro-NPFF(B) peptides for NPFF(1) receptors. BIBP3226 ((R)-N(2)-(diphenylacetyl)-N-[(4-hydroxyphenyl)-methyl]-argininamide) and BIBO3304 ((R)-N(2)-(diphenylacetyl)-N-[4-(aminocarbonylaminomethyl)-benzyl]-argininamide trifluoroacetate), two selective neuropeptide Y (NPY) Y(1) receptor antagonists, display relative high affinities for NPFF receptors and exhibit antagonist properties towards hNPFF(1) receptors. The structural determinants responsible for binding of these molecules to NPFF receptors were investigated and led to the synthesis of hNPFF(1) receptor antagonists with affinities from 40 to 80 nM. Our results demonstrate differences in pharmacological characteristics between NPFF(1) and NPFF(2) receptors and the feasibility of subtype-selective antagonists.
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Affiliation(s)
- Catherine Mollereau
- Institut de Pharmacologie et de Biologie Structurale (CNRS, UMR5089), 205 route de Narbonne, 31077 Toulouse cedex 04, France.
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Quelven I, Roussin A, Burlet-Schiltz O, Gouardères C, Tafani JAM, Mazarguil H, Zajac JM. Dissociation of pharmacological pro- and anti-opioid effects by neuropeptide FF analogs. Eur J Pharmacol 2002; 449:91-8. [PMID: 12163111 DOI: 10.1016/s0014-2999(02)01983-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Neuropeptide FF (NPFF) and its analog 1DMe ([D-Tyr(1),(NMe)Phe(3)]NPFF) have been shown to reverse or potentiate morphine analgesia in rat depending on the supraspinal or spinal site of injection. The properties, in the mouse tail-flick test, of 1DMe and its related compound Nic-1DMe (Nicotinoyl-Pro-1DMe) were investigated after their local (i.c.v. and i.t.) and systemic administration. Whereas Nic-1DMe and 1DMe exhibit the same affinity and selectivity towards NPFF(1) and NPFF(2) receptors, Nic-1DMe, in contrast to 1DMe, is unable to inhibit morphine-induced analgesia after i.c.v. and i.p. administration. Conversely, after i.t. and i.p. administration, both neuropeptide FF analogs could potentiate morphine analgesia. Differences in disposition parameters between 1DMe and Nic-1DMe are evidenced, suggesting that the two neuropeptide FF analogs could stimulate differentially supraspinal neuropeptide FF receptors. The predominant activation of spinal neuronal pathways by Nic-1DMe could explain the selective pro-opioid action of this compound after i.t., i.c.v. and i.p. administration.
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Affiliation(s)
- Isabelle Quelven
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 route de Narbonne, 31077 Toulouse Cedex, France
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Bonnard E, Mazarguil H, Zajac JM. Peptide nucleic acids targeted to the mouse proNPFF(A) reveal an endogenous opioid tonus. Peptides 2002; 23:1107-13. [PMID: 12126738 DOI: 10.1016/s0196-9781(02)00034-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Pharmacological studies have implicated the anti-opioid neuropeptide FF (NPFF) in the modulation of pain transmission. Since its physiological role has not yet been fully elucidated, the present study examined whether antisense peptide nucleic acid (PNA) complementary to the NPFF precursor (proNPFF(A)) modified pain sensitivity. Mice received three intraperitoneal (i.p.) injections (10mg/kg) of antisense PNA (As-proNPFF(A)) over a period of 24h. As-proNPFF(A) treatment significantly increased the basal tail withdrawal latency in the tail-flick test. This analgesia persisted during 2 days and was completely reversed by naloxone. Thus, antisense PNAs, by decreasing anti-opioid effects, revealed a basal endogenous opioid activity. Our results evidence a physiological interplay between NPFF and opioid systems and further support the use of PNA as effective antisense agents, for studying gene function in vivo.
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Affiliation(s)
- Elisabeth Bonnard
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 route de Narbonne, 31077 Cedex, Toulouse, France
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Ballet S, Braz J, Mauborgne A, Bourgoin S, Zajac JM, Hamon M, Cesselin F. The neuropeptide FF analogue, 1DMe, reduces in vivo dynorphin release from the rat spinal cord. J Neurochem 2002; 81:659-62. [PMID: 12065675 DOI: 10.1046/j.1471-4159.2002.00914.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Intrathecal infusion of the neuropeptide FF analogue, [D-Tyr1, (NMe)Phe3]neuropeptide FF (1DMe; 0.1 microm-0.1 mm) in anaesthetized rats produced a concentration-dependent decrease in the spinal outflow of dynorphin A (1-8)-like material, which persisted for at least 90 min after treatment with 10 microm-0.1 mm of the compound. Co-administration of d-Phe-Cys-Tyr-D-Trp-Orn-Thr-Pen-Thr-NH2 (CTOP; 1 microm) to block spinal micro-opioid receptors did not modify this effect, whereas naltrindole (10 microm) totally prevented it and nor-binaltorphimine (10 microm) reduced the post-effect. These data suggest that 1DMe triggers the release of endogenous opioids that stimulate mainly delta-opioid receptors, and secondarily kappa-opioid receptors, thereby exerting a negative influence on dynorphin A (1-8)-like material outflow. Because dynorphin has pronociceptive properties, such a decrease in spinal dynorphin A (1-8)-like material release might underlie the long-lasting antinociceptive effects of intrathecally administered neuropeptide FF and analogues.
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MESH Headings
- Animals
- Dose-Response Relationship, Drug
- Dynorphins/cerebrospinal fluid
- Dynorphins/metabolism
- Injections, Spinal
- Male
- Models, Animal
- Naltrexone/administration & dosage
- Naltrexone/analogs & derivatives
- Narcotic Antagonists/administration & dosage
- Oligopeptides/administration & dosage
- Peptide Fragments/cerebrospinal fluid
- Peptide Fragments/metabolism
- Perfusion
- Radioimmunoassay
- Rats
- Rats, Sprague-Dawley
- Receptors, Opioid, delta/drug effects
- Receptors, Opioid, kappa/drug effects
- Receptors, Opioid, mu/antagonists & inhibitors
- Somatostatin/administration & dosage
- Somatostatin/analogs & derivatives
- Spinal Cord/drug effects
- Spinal Cord/metabolism
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Affiliation(s)
- Sébastien Ballet
- NeuroPsychoPharmacologie Moléculaire, Cellulaire et Fonctionnelle, INSERM U288, Faculté de Médecine Pitié-Salpêtrière, Paris, France
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Abstract
Upon receipt in the dorsal horn (DH) of the spinal cord, nociceptive (pain-signalling) information from the viscera, skin and other organs is subject to extensive processing by a diversity of mechanisms, certain of which enhance, and certain of which inhibit, its transfer to higher centres. In this regard, a network of descending pathways projecting from cerebral structures to the DH plays a complex and crucial role. Specific centrifugal pathways either suppress (descending inhibition) or potentiate (descending facilitation) passage of nociceptive messages to the brain. Engagement of descending inhibition by the opioid analgesic, morphine, fulfils an important role in its pain-relieving properties, while induction of analgesia by the adrenergic agonist, clonidine, reflects actions at alpha(2)-adrenoceptors (alpha(2)-ARs) in the DH normally recruited by descending pathways. However, opioids and adrenergic agents exploit but a tiny fraction of the vast panoply of mechanisms now known to be involved in the induction and/or expression of descending controls. For example, no drug interfering with descending facilitation is currently available for clinical use. The present review focuses on: (1) the organisation of descending pathways and their pathophysiological significance; (2) the role of individual transmitters and specific receptor types in the modulation and expression of mechanisms of descending inhibition and facilitation and (3) the advantages and limitations of established and innovative analgesic strategies which act by manipulation of descending controls. Knowledge of descending pathways has increased exponentially in recent years, so this is an opportune moment to survey their operation and therapeutic relevance to the improved management of pain.
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Affiliation(s)
- Mark J Millan
- Department of Psychopharmacology, Institut de Recherches Servier, 125 Chemin de Ronde, 78290 Croissy/Seine, Paris, France.
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Mazarguil H, Gouardères C, Tafani JA, Marcus D, Kotani M, Mollereau C, Roumy M, Zajac JM. Structure-activity relationships of neuropeptide FF: role of C-terminal regions. Peptides 2001; 22:1471-8. [PMID: 11514031 DOI: 10.1016/s0196-9781(01)00468-5] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A structure-activity study was carried out to determine the importance of the C-terminal amino acids of the octapeptide Neuropeptide FF (NPFF) in binding and agonistic activity. Affinities of NPFF analogues were tested toward NPFF receptors of the rat spinal cord and the human NPFF2 receptors transfected in CHO cells. The activities of these analogues were evaluated by their ability to both inhibit adenylate cyclase in NPFF2 receptor transfected CHO cells and to reverse the effect of nociceptin on acutely dissociated rat dorsal raphe neurons. The substitutions of Phenylalanine8 by a tyrosine, phenylglycine or homophenylalanine were deleterious for high affinity. Similarly, the replacement of Arginine7 by a lysine or D. Arginine induces a loss in affinity. The pharmacological characterization showed that the presence of the amidated Phe8 and Arg7 residues are also extremely critical for activation of anti-opioid effects on dorsal raphe neurons. The sequence of the C-terminal dipeptide seems also to be responsible for the high affinity and the activity on human NPFF2 receptors. The results support the view that a code messaging the molecular interaction toward NPFF-receptors is expressed in the C-terminal region of these peptides but the N-terminal segment is important to gain very high affinity.
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Affiliation(s)
- H Mazarguil
- Institut de Pharmacologie et de Biologie Structurale, CNRS UMR 5089, 205 Route de Narbonne, 31077, Toulouse Cedex, France
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