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Lee H, Amatya B, Villar VAM, Asico LD, Jeong JK, Feranil J, Moore SC, Zheng X, Bishop M, Gomes JP, Polzin J, Smeriglio N, de Castro PASV, Armando I, Felder RA, Hao L, Jose PA. Renal autocrine neuropeptide FF (NPFF) signaling regulates blood pressure. Sci Rep 2024; 14:15407. [PMID: 38965251 PMCID: PMC11224344 DOI: 10.1038/s41598-024-64484-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2022] [Accepted: 06/10/2024] [Indexed: 07/06/2024] Open
Abstract
The kidney and brain play critical roles in the regulation of blood pressure. Neuropeptide FF (NPFF), originally isolated from the bovine brain, has been suggested to contribute to the pathogenesis of hypertension. However, the roles of NPFF and its receptors, NPFF-R1 and NPFF-R2, in the regulation of blood pressure, via the kidney, are not known. In this study, we found that the transcripts and proteins of NPFF and its receptors, NPFF-R1 and NPFF-R2, were expressed in mouse and human renal proximal tubules (RPTs). In mouse RPT cells (RPTCs), NPFF, but not RF-amide-related peptide-2 (RFRP-2), decreased the forskolin-stimulated cAMP production in a concentration- and time-dependent manner. Furthermore, dopamine D1-like receptors colocalized and co-immunoprecipitated with NPFF-R1 and NPFF-R2 in human RPTCs. The increase in cAMP production in human RPTCs caused by fenoldopam, a D1-like receptor agonist, was attenuated by NPFF, indicating an antagonistic interaction between NPFF and D1-like receptors. The renal subcapsular infusion of NPFF in C57BL/6 mice decreased renal sodium excretion and increased blood pressure. The NPFF-mediated increase in blood pressure was prevented by RF-9, an antagonist of NPFF receptors. Taken together, our findings suggest that autocrine NPFF and its receptors in the kidney regulate blood pressure, but the mechanisms remain to be determined.
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Affiliation(s)
- Hewang Lee
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA.
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.
| | - Bibhas Amatya
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Van Anthony M Villar
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Laureano D Asico
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Jin Kwon Jeong
- Department of Pharmacology and Physiology, The George Washington University School of Medicine and Health Sciences, Washington, DC, 20052, USA
| | - Jun Feranil
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Shaun C Moore
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Xiaoxu Zheng
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Michael Bishop
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Jerald P Gomes
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Jacob Polzin
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Noah Smeriglio
- Department of Chemistry, Columbian College of Arts and Sciences, The George Washington University, Washington, DC, 20052, USA
| | - Pedro A S Vaz de Castro
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
| | - Ines Armando
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
| | - Robin A Felder
- Department of Pathology, University of Virginia Health Sciences Center, Charlottesville, VA, 22908.5, USA
| | - Ling Hao
- Department of Chemistry, Columbian College of Arts and Sciences, The George Washington University, Washington, DC, 20052, USA
| | - Pedro A Jose
- Division of Renal Diseases and Hypertension, Department of Medicine, The George Washington University School of Medicine and Health Sciences, 2300 Eye Street, NW, Washington, DC, 20052, USA
- Department of Medicine, University of Maryland School of Medicine, Baltimore, MD, 21201, USA
- Department of Pharmacology and Physiology, The George Washington University School of Medicine and Health Sciences, Washington, DC, 20052, USA
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Neuropeptide FF-related gene in fish (Larimichthys polyactis): identification, characterization, and potential anti-inflammatory function. Mol Biol Rep 2022; 49:6385-6394. [PMID: 35503491 DOI: 10.1007/s11033-022-07447-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2021] [Accepted: 04/01/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND Neuropeptide FF (NPFF), an octapeptide of the RFamide-related peptides (FaRPs), is involved in regulatory function in various biological processes. The regulatory role of NPFF in the immune and inflammatory response was currently being revealed. METHODS Neuropeptide FF-related gene (termed LpNPFF) and its two receptors, NPFF receptor 1 (LpNPFFR1) and NPFF receptor 2 (LpNPFFR2) were identified by PCR and Semi-quantitative RT-PCR assay. Effect of LpNPFF on the production of nitric oxide (NO) in macrophage RAW264.7 cell was divided into PBS group, lipopolysaccharide (LPS) group, LPS treated with LpNPFF group, and LPS treated with LpNPFF and receptor antagonist RF9 group. Then specimens were measured by color reaction at 570 nm absorbance value. RESULTS Sequence analysis showed that LpNPFF cDNA consists of 835 nucleotides with a 5'- untranslated region (UTR) of 150 base pair (bp), an open reading frame (ORF) of 384 bp and a 3'-UTR of 300 bp (Accession No. MT012894). The ORF encodes 127 amino acid (aa) residues with a hydrophobic signal peptide at N-terminus and two presumptive peptides with -PQRFa structure, LpNPFF (1) and LpNPFF (2). LpNPFFR1 and LpNPFFR2 encode 427 and 444 aa residues respectively, which both have seven hydrophobic TMDs and identified as G protein coupled receptors (GPCRs). Results of tissue distribution showed that LpNPFF and receptors were highly expressed in the brain and gonad. Furtherly, in vitro assay found LpNPFF could inhibit NO production in RAW 264.7 macrophages under inflammatory stress with LPS, while its receptor antagonist RF9 caused the evoke of NO generation. CONCLUSIONS These results contribute to the further study of neuropeptide evolution in marine organisms, and also provide a new research idea for exploring the related functions of NPFF gene.
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Wojciechowski P, Andrzejewski K, Kaczyńska K. Intracerebroventricular Neuropeptide FF Diminishes the Number of Apneas and Cardiovascular Effects Produced by Opioid Receptors' Activation. Int J Mol Sci 2020; 21:ijms21238931. [PMID: 33255594 PMCID: PMC7728097 DOI: 10.3390/ijms21238931] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2020] [Revised: 11/23/2020] [Accepted: 11/24/2020] [Indexed: 01/23/2023] Open
Abstract
The opioid-induced analgesia is associated with a number of side effects such as addiction, tolerance and respiratory depression. The involvement of neuropeptide FF (NPFF) in modulation of pain perception, opioid-induced tolerance and dependence was well documented in contrast to respiratory depression. Therefore, the aim of the present study was to examine the potency of NPFF to block post-opioid respiratory depression, one of the main adverse effects of opioid therapy. Urethane-chloralose anaesthetized Wistar rats were injected either intravenously (iv) or intracerebroventricularly (icv) with various doses of NPFF prior to iv endomorphin-1 (EM-1) administration. Iv NPFF diminished the number of EM-1-induced apneas without affecting their length and without influence on the EM-1 induced blood pressure decline. Icv pretreatment with NPFF abolished the occurrence of post-EM-1 apneas and reduced also the maximal drop in blood pressure and heart rate. These effects were completely blocked by the NPFF receptor antagonist RF9, which was given as a mixture with NPFF before systemic EM-1 administration. In conclusion, our results showed that centrally administered neuropeptide FF is effective in preventing apnea evoked by stimulation of μ-opioid receptors and the effect was due to activation of central NPFF receptors. Our finding indicates a potential target for reversal of opioid-induced respiratory depression.
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Elhabazi K, Humbert JP, Bertin I, Quillet R, Utard V, Schneider S, Schmitt M, Bourguignon JJ, Laboureyras E, Ben Boujema M, Simonnet G, Ancel C, Simonneaux V, Beltramo M, Bucher B, Sorg T, Meziane H, Schneider E, Petit-Demoulière B, Ilien B, Bihel F, Simonin F. RF313, an orally bioavailable neuropeptide FF receptor antagonist, opposes effects of RF-amide-related peptide-3 and opioid-induced hyperalgesia in rodents. Neuropharmacology 2017; 118:188-198. [DOI: 10.1016/j.neuropharm.2017.03.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2016] [Revised: 02/27/2017] [Accepted: 03/06/2017] [Indexed: 02/08/2023]
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Neuropeptide FF receptors as novel targets for limbic seizure attenuation. Neuropharmacology 2015; 95:415-23. [DOI: 10.1016/j.neuropharm.2015.04.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Revised: 04/23/2015] [Accepted: 04/26/2015] [Indexed: 01/08/2023]
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Bihel F, Humbert JP, Schneider S, Bertin I, Wagner P, Schmitt M, Laboureyras E, Petit-Demoulière B, Schneider E, Mollereau C, Simonnet G, Simonin F, Bourguignon JJ. Development of a peptidomimetic antagonist of neuropeptide FF receptors for the prevention of opioid-induced hyperalgesia. ACS Chem Neurosci 2015; 6:438-45. [PMID: 25588572 DOI: 10.1021/cn500219h] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Through the development of a new class of unnatural ornithine derivatives as bioisosteres of arginine, we have designed an orally active peptidomimetic antagonist of neuropeptide FF receptors (NPFFR). Systemic low-dose administration of this compound to rats blocked opioid-induced hyperalgesia, without any apparent side-effects. Interestingly, we also observed that this compound potentiated opioid-induced analgesia. This unnatural ornithine derivative provides a novel therapeutic approach for both improving analgesia and reducing hyperalgesia induced by opioids in patients being treated for chronic pain.
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Affiliation(s)
- Frédéric Bihel
- University of
Strasbourg, CNRS, UMR7200, Faculty of pharmacy, 67400 Illkirch Graffenstaden, France
| | - Jean-Paul Humbert
- University of
Strasbourg, CNRS, UMR7242, ESBS, 67412 Illkirch Graffenstaden, France
| | - Séverine Schneider
- University of
Strasbourg, CNRS, UMR7200, Faculty of pharmacy, 67400 Illkirch Graffenstaden, France
| | - Isabelle Bertin
- University of
Strasbourg, CNRS, UMR7242, ESBS, 67412 Illkirch Graffenstaden, France
| | - Patrick Wagner
- University of
Strasbourg, CNRS, UMR7200, Faculty of pharmacy, 67400 Illkirch Graffenstaden, France
| | - Martine Schmitt
- University of
Strasbourg, CNRS, UMR7200, Faculty of pharmacy, 67400 Illkirch Graffenstaden, France
| | - Emilie Laboureyras
- University of Bordeaux
Ségalen, INCIA, CNRS UMR5287, 33076 Bordeaux, France
| | | | | | | | - Guy Simonnet
- University of Bordeaux
Ségalen, INCIA, CNRS UMR5287, 33076 Bordeaux, France
| | - Frédéric Simonin
- University of
Strasbourg, CNRS, UMR7242, ESBS, 67412 Illkirch Graffenstaden, France
| | - Jean-Jacques Bourguignon
- University of
Strasbourg, CNRS, UMR7200, Faculty of pharmacy, 67400 Illkirch Graffenstaden, France
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Shahjahan M, Doi H, Ando H. Differential expression patterns of PQRFamide peptide and its two receptor genes in the brain and pituitary of grass puffer during the reproductive cycle. Gen Comp Endocrinol 2015; 210:152-60. [PMID: 25034121 DOI: 10.1016/j.ygcen.2014.07.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 07/01/2014] [Accepted: 07/05/2014] [Indexed: 12/19/2022]
Abstract
Pain-modulatory neuropeptides, PQRFamide (PQRFa) peptides, have recently been implicated in the regulation of reproduction in fish. As a first step toward investigating the role of PQRFa peptides on reproductive function in the grass puffer Takifugu niphobles, which is a semilunar spawner, we cloned genes encoding PQRFa peptide precursor (pqrfa) and its two types of receptors (pqrfa-r1 and pqrfa-r2), and examined changes in their expression levels in the brain and pituitary over several months during the reproductive cycle. The grass puffer PQRFa peptide precursor of 126 amino acid residues contains two putative PQRFa peptides, PQRFa-1 and PQRFa-2, which correspond to NPFF and NPAF in other vertebrates, respectively. The grass puffer PQRFa-R1 and PQRFa-R2 consist of 426 and 453 amino acid residues, respectively, and contain distinct characteristics of G-protein coupled receptors. These three genes were exclusively expressed in the brain and pituitary. The expression levels of pqrfa and pqrfa-r1 were significantly increased during the late stage of sexual maturation, but low in the spawning fish just after releasing sperms and eggs. Therefore, the grass puffer PQRFa peptide may have a role in the late stage of sexual maturation before spawning via PQRFa-R1. In contrast, the pqrfa-r2 expression showed maximum levels in the spawning fish and in the post-spawning period. The present results provide fundamental data suggesting that the grass puffer PQRFa peptide may have multiple roles in the control of reproduction that are dependent on the reproductive stages.
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Affiliation(s)
- Md Shahjahan
- Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
| | - Hiroyuki Doi
- Shimonoseki Marine Science Museum "Kaikyokan", Shimonoseki Academy of Marine Science, Yamaguchi 750-0036, Japan
| | - Hironori Ando
- Sado Marine Biological Station, Faculty of Science, Niigata University, Sado, Niigata 952-2135, Japan.
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Goncharuk VD, Buijs RM, Jhamandas JH, Swaab DF. The hypothalamic neuropeptide FF network is impaired in hypertensive patients. Brain Behav 2014; 4:453-67. [PMID: 25161813 PMCID: PMC4075637 DOI: 10.1002/brb3.229] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/06/2013] [Revised: 03/02/2014] [Accepted: 03/13/2014] [Indexed: 01/01/2023] Open
Abstract
BACKGROUND The human hypothalamus contains the neuropeptide FF (NPFF) neurochemical network. Animal experiments demonstrated that NPFF is implicated in the central cardiovascular regulation. We therefore studied expression of this peptide in the hypothalamus of individuals who suffered from essential hypertension (n = 8) and died suddenly due to acute myocardial infarction (AMI), and compared to that of healthy individuals (controls) (n = 6) who died abruptly due to mechanical trauma of the chest. METHODS The frozen right part of the hypothalamus was cut coronally into serial sections of 20 μm thickness, and each tenth section was stained immunohistochemically using antibody against NPFF. The central section through each hypothalamic nucleus was characterized by the highest intensity of NPFF immunostaining and thus was chosen for quantitative densitometry. RESULTS In hypertensive patients, the area occupied by NPFF immunostained neuronal elements in the central sections through the suprachiasmatic nucleus (SCh), paraventricular hypothalamic nucleus (Pa), bed nucleus of the stria terminalis (BST), perinuclear zone (PNZ) of the supraoptic nucleus (SON), dorso- (DMH), ventromedial (VMH) nuclei, and perifornical nucleus (PeF) was dramatically decreased compared to controls, ranging about six times less in the VMH to 15 times less in the central part of the BST (BSTC). The NPFF innervation of both nonstained neuronal profiles and microvasculature was extremely poor in hypertensive patients compared to control. CONCLUSIONS The decreased NPFF expression in the hypothalamus of hypertensive patients might be a cause of impairment of its interaction with other neurochemical systems, and thereby might be involved in the pathogenesis of the disease.
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Affiliation(s)
- Valeri D Goncharuk
- Netherlands Institute for Neuroscience Amsterdam ZO, 1105 BA, The Netherlands ; Russian Cardiology Research Center Moscow, 121552, Russia ; Division of Neurology, Department of Medicine, University of Alberta Edmonton, AB, T6G 2S2, Canada
| | - Ruud M Buijs
- Instituto de Investigaciones Biomedicas, Universidad Nacional Autonoma de Mexico Mexico City, 04510, Mexico
| | - Jack H Jhamandas
- Division of Neurology, Department of Medicine, University of Alberta Edmonton, AB, T6G 2S2, Canada
| | - Dick F Swaab
- Netherlands Institute for Neuroscience Amsterdam ZO, 1105 BA, The Netherlands
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Jászberényi M, Bagosi Z, Csabafi K, Palotai M, Telegdy G. The actions of neuropeptide SF on the hypothalamic-pituitary-adrenal axis and behavior in rats. ACTA ACUST UNITED AC 2013; 188:46-51. [PMID: 24316399 DOI: 10.1016/j.regpep.2013.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 11/26/2013] [Accepted: 11/29/2013] [Indexed: 12/26/2022]
Abstract
Present experiments focused on measuring the effect of neuropeptide SF (NPSF) on the hypothalamus-pituitary-adrenal (HPA) axis and behavior. The peptide was administered in different doses (0.25, 0.5, 1, 2 μg) intracerebroventricularly to rats, and the behavior of which was then observed by telemetry and open-field test. Effect of NPSF on core temperature was also measured via telemetry. Plasma ACTH and corticosterone concentrations were measured to assess the influence of NPSF on the HPA activation. In addition, the changes in corticotrophin-releasing hormone (CRH) level in the hypothalamic paraventricular nucleus were continuously monitored by means of intracerebral microdialysis. Our results showed that NPSF augmented paraventricular CRH release and increased ACTH and corticosterone levels in the plasma. The release of corticosterone was successfully blocked by the pre-treatment of the CRH antagonist α-helical CRH9-41. Spontaneous and exploratory locomotor activity was also stimulated according to the telemetric and open-field studies. However, NPSF only tended to alter stereotyped behavior in the open-field experiments. These results demonstrate that NPSF may play a physiologic role in the regulation of such circadian functions as the activity of motor centers and the HPA axis, through the release of CRH.
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Affiliation(s)
| | - Zsolt Bagosi
- Department of Pathophysiology, University of Szeged, Szeged, Hungary
| | - Krisztina Csabafi
- Department of Pathophysiology, University of Szeged, Szeged, Hungary
| | - Miklós Palotai
- Department of Pathophysiology, University of Szeged, Szeged, Hungary
| | - Gyula Telegdy
- Department of Pathophysiology, University of Szeged, Szeged, Hungary; MTA-SZTE Neuroscience Research Group of the Hungarian Academy of Sciences Szeged, Szeged, Hungary.
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Development of sub-nanomolar dipeptidic ligands of neuropeptide FF receptors. Bioorg Med Chem Lett 2012; 22:7471-4. [DOI: 10.1016/j.bmcl.2012.10.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 10/08/2012] [Accepted: 10/09/2012] [Indexed: 01/19/2023]
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In Vitro Activities of Kissorphin, a Novel Hexapeptide KiSS-1 Derivative, in Neuronal Cells. JOURNAL OF AMINO ACIDS 2012; 2012:691463. [PMID: 22848794 PMCID: PMC3400367 DOI: 10.1155/2012/691463] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Accepted: 06/11/2012] [Indexed: 01/14/2023]
Abstract
The primary products of the metastasis-suppressor KiSS-1 gene are the kisspeptin (KP) peptides that stimulate gonadotrophin-releasing-hormone (GnRH) release via GPR-54 receptor activation. Recent studies have suggested that the KP-10 peptide also activates neuropeptide FF (NPFF) receptors. The aim of the current study was to determine the activities of the KiSS-1 derivative kissorphin (KSO), which contains the first six amino acids of the KP-10 peptide, is C-terminally amidated, and shares amino acid similarities with the biologically active NPFF 3–8 sequence. The KSO peptide inhibited forskolin-stimulated cyclic adenosine monophosphate (cAMP) production in ND7/23 neuroblastoma cells via an action that could be inhibited by the NPFF receptor antagonist RF9. Release of GnRH by LA-N-1 neuroblastoma cells was not altered by the KSO peptide. In ND7/23 neuroblastoma cells, the KSO peptide was able to reduce forskolin neuroprotection against H2O2 toxicity. The KSO peptide was also able to prevent prostaglandin E2-induced apoptosis in rat cortical neurons. The NPFF receptor antagonist RF9 could inhibit these actions of the KSO peptide in oxidative stress and apoptosis models. In conclusion, the kissorphin peptide, comprising the amino acid sequence Tyr-Asn-Trp-Asn-Ser-Phe-NH2, has NPFF-like biological activity without showing any GnRH releasing activity and inhibits forskolin-activated cAMP release.
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Kotlinska J, Pachuta A, Bochenski M, Silberring J. Dansyl-PQRamide, a putative antagonist of NPFF receptors, reduces anxiety-like behavior of ethanol withdrawal in a plus-maze test in rats. Peptides 2009; 30:1165-72. [PMID: 19463751 DOI: 10.1016/j.peptides.2009.02.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/22/2008] [Revised: 02/02/2009] [Accepted: 02/05/2009] [Indexed: 11/24/2022]
Abstract
Much evidence indicates that endogenous opioid peptides are involved in effects caused by ethanol. The aim of the present study was to determine whether dansyl-PQR amide, a putative antagonist of receptors for an anti-opioid peptide-neuropeptide FF (NPFF) could affect anxiety-like behavior measured during withdrawal from acute-, and chronic ethanol administration in the elevated plus maze test in rats. Our study indicated that intracerebroventricular (i.c.v.) administration of dansyl-PQRamide (2.4 and 4.8 nmol) reversed anxiety-like behavior measured as a percent time spent in the open arms, and a percent open arm entries onto the open arms in the elevated plus-maze test in rats. These effects were inhibited by NPFF (10 and/or 20 nmol, i.c.v.) in the experiments performed during withdrawal from acute- and chronic ethanol administration. During withdrawal from acute ethanol, naloxone (1mg/kg, i.p.), a nonselective opioid receptor antagonist, attenuated only an increased percent time spent in the open arms induced by dansyl-PQR amide (4.8 nmol). Dansyl-PQR amide, NPFF and naloxone given alone to naive rats did not have influence on spontaneous locomotor activity of animals. Furthermore, NPFF potentiated anxiety-like behavior during withdrawal from chronic, but not acute, ethanol administration in rats. Our data suggest that NPFF system is involved in regulation of affective symptoms of ethanol withdrawal. It seems that involvement of the NPFF system in ethanol withdrawal anxiety-like behavior is associated with regulation of the opioid system activity.
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Affiliation(s)
- Jolanta Kotlinska
- Department of Pharmacology and Pharmacodynamics, Medical University School, Lublin, Poland.
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Fang Q, Wang YQ, He F, Guo J, Guo J, Chen Q, Wang R. Inhibition of neuropeptide FF (NPFF)-induced hypothermia and anti-morphine analgesia by RF9, a new selective NPFF receptors antagonist. ACTA ACUST UNITED AC 2008; 147:45-51. [DOI: 10.1016/j.regpep.2007.12.007] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 12/03/2007] [Accepted: 12/27/2007] [Indexed: 11/17/2022]
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Fang Q, He F, Wang YQ, Guo J, Zhang BZ, Chen Q, Wang R. Pharmacological effects of the dansylated neuropeptide FF analogues on body temperature and morphine analgesia. Neuropeptides 2007; 41:339-47. [PMID: 17597204 DOI: 10.1016/j.npep.2007.04.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2007] [Revised: 03/28/2007] [Accepted: 04/07/2007] [Indexed: 11/29/2022]
Abstract
In our previous work, the two putative agonists (dansyl-GSRFamide and dansyl-PQRFamide) and the two putative antagonists (dansyl-GSRamide and dansyl-PQRamide) on neuropeptide FF (NPFF) receptors were synthesized to evaluate the importance of Phe(8) of NPFF. In the present study, these putative NPFF agonists/antagonists containing different N-terminal sequences were further examined for their pharmacological profiles in thermoregulatory and nociceptive tests. The results indicated that the two dansylated agonists potently possessed similar thermoregulation (rank order of potencies: dansyl-GSRFamide>>NPFF>dansyl-PQRFamide) and different modulation of opioid-induced analgesia; in contrast, both of the two putative antagonists exhibited marked hypothermia (rank order of potencies: dansyl-PQRamide>dansyl-GSRamide) and facilitation of morphine analgesia (rank order of potencies: dansyl-PQRamide > dansyl-GSRamide). These data reveal that the difference of the N-terminal residues of the two putative agonists causes their dissociation of pharmacological pro- and anti-opioid effects. In addition, their N-terminal part is important to determine the potency of the dansylated agonists/antagonists. Our work might be helpful to develop a highly potent and fluorescent NPFF ligand.
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Affiliation(s)
- Quan Fang
- Key Laboratory of Preclinical Study for New Drugs of Gansu Province, and State Key Laboratory of Applied Organic Chemistry, and Institute of Biochemistry and Molecular Biology, Lanzhou University, 222 Tian Shui South Road, Lanzhou 730000, PR China
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