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Yang G, Wang XD, Chen LY, Wu ZY, Xi EP, Li H. Oxytocin increases itch sensitivity of mice in late pregnancy and its peripheral receptor mechanism of itch-promoting effect. Brain Res Bull 2023; 202:110749. [PMID: 37633617 DOI: 10.1016/j.brainresbull.2023.110749] [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: 07/17/2023] [Revised: 08/22/2023] [Accepted: 08/22/2023] [Indexed: 08/28/2023]
Abstract
Oxytocin (OXT) is secreted in a large amount during the middle and late pregnancy. Except for the regulation of functions related to childbirth, OXT is involved in the regulation of cognition, social behavior, addiction, pain and so on. Our aim is to confirm the increase of OXT content in mice in late pregnancy is the main cause of itch during pregnancy and observe whether exogenously administered OXT can induce or increase itch sensitivity. The research shows that itch sensitivity of mice increased significantly in late pregnancy and basically returned to normal one day after delivery. The number of OXT-positive neurons in paraventricular nucleus (PVN) and the content of OXT in serum of the late pregnant mice increased significantly, and decreased sharply after delivery. Intradermal injection of low concentration of OXT (0.2 nmol/L) could not induce scratching behavior in mice, but high concentration of OXT (5 nmol/L, 10 nmol/L) could do this in a dose-dependent manner. Low concentration of OXT significantly increased the itch sensitivity to histamine. Intradermal injection of oxytocin receptor (OXTR) or arginine vasopressin-1a receptor (AVPR1A) antagonist did not affect histamine-induced scratching behavior, but both reversed the increase of itch sensitivity in late pregnant mice or the facilitated itch sensitivity by OXT. Study suggests that both endogenous and exogenous increases in OXT can increase the body's sensitivity to itch, and even induce itch directly. Pruritus during pregnancy is closely related to the increase of OXT content in vivo. In the periphery, the itch-promoting effect of OXT is mediated by OXTR and AVPR1A.
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Affiliation(s)
- Gang Yang
- Department of Human Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, China; Department of Cardiothoracic Surgery, Central Theater Command General Hospital, WuHan, China
| | - Xiao-Dong Wang
- Department of Human Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, China; Department of Emergency Medicine, Inner Mongolia Armed Police Corps Hospital, Hohhot, China
| | - Lu-Ying Chen
- Department of Human Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, China
| | - Zhen-Yu Wu
- Department of Human Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, China
| | - Er-Ping Xi
- Department of Cardiothoracic Surgery, Central Theater Command General Hospital, WuHan, China
| | - Hui Li
- Department of Human Anatomy, Histology and Embryology and K.K. Leung Brain Research Centre, Air Force Military Medical University, Xi'an, China.
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Eisenach JC, Curry RS, Houle TT. Preliminary results from a randomized, controlled, cross-over trial of intrathecal oxytocin for neuropathic pain. PAIN MEDICINE (MALDEN, MASS.) 2023; 24:1058-1065. [PMID: 37084261 PMCID: PMC10472486 DOI: 10.1093/pm/pnad051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2022] [Revised: 04/04/2023] [Accepted: 04/18/2023] [Indexed: 04/22/2023]
Abstract
OBJECTIVE Compare intrathecal oxytocin, 100 µg to placebo on ongoing neuropathic pain and mechanical hyperalgesia and allodynia. STUDY DESIGN Randomized, controlled, double-blind cross-over. SETTING Clinical research unit. SUBJECTS Individuals aged 18 to 70 years with neuropathic pain for at least 6 months. METHODS Individuals received intrathecal injections of oxytocin and saline, separated by at least 7 days, and ongoing pain in neuropathic area (VAS [visual analog scale]) and areas of hypersensitivity to von Frey filament and cotton wisp brushing were measured for 4 hours. Primary outcome was VAS pain in the first 4 hours after injection, analyzed by linear mixed effects model. Secondary outcomes were verbal pain intensity scores at daily intervals for 7 days and areas of hypersensitivity and elicited pain for 4 hours after injections. RESULTS The study was stopped early after completion of 5 of 40 subjects planned due to slow recruitment and funding limitations. Pain intensity prior to injection was 4.75 ± 0.99 and modeled pain intensity decreased more after oxytocin than placebo to 1.61 ± 0.87 and 2.49 ± 0.87, respectively (P = .003). Daily pain scores were lower in the week following injection of oxytocin than saline (2.53 ± 0.89 vs 3.66 ± 0.89; P = .001). Allodynic area decreased by 11%, but hyperalgesic area increased by 18% after oxytocin compared to placebo. There were no study drug related adverse effects. CONCLUSION Although limited by the small number of subjects studied, oxytocin reduced pain more than placebo in all subjects. Further study of spinal oxytocin in this population is warranted. TRIAL REGISTRATION This study was registered at ClinicalTrials.gov on 03/27/2014 (NCT02100956). The first subject was studied on 06/25/2014.
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Affiliation(s)
- James C Eisenach
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston Salem, NC 27157, United States
| | - Regina S Curry
- Department of Anesthesiology, Wake Forest University School of Medicine, Winston Salem, NC 27157, United States
| | - Timothy T Houle
- Department of Anesthesia, Critical Care, and Pain Medicine, Massachusetts General Hospital, Boston, MA 02441, United States
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Eisenach JC, Shields JS, Weller RS, Curry RS, Langfitt MK, Henshaw DS, Pollock DC, Edwards CJ, Houle TT. Randomized controlled trial of intrathecal oxytocin on speed of recovery after hip arthroplasty. Pain 2023; 164:1138-1147. [PMID: 36448974 PMCID: PMC10106358 DOI: 10.1097/j.pain.0000000000002810] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Accepted: 09/28/2022] [Indexed: 12/02/2022]
Abstract
ABSTRACT Recovery from surgery is quicker in the postpartum period, and this may reflect oxytocin action in the spinal cord. We hypothesized that intrathecal injection of oxytocin would speed recovery from pain and disability after major surgery. Ninety-eight individuals undergoing elective total hip arthroplasty were randomized to receive either intrathecal oxytocin (100 μg) or saline. Participants completed diaries assessing pain and opioid use daily and disability weekly, and they wore an accelerometer beginning 2 weeks before surgery until 8 weeks after. Groups were compared using modelled, adjusted trajectories of these measures. The study was stopped early due to the lack of funding. Ninety patients received intrathecal oxytocin (n = 44) or saline (n = 46) and were included in the analysis. There were no study drug-related adverse effects. Modelled pain trajectory, the primary analysis, did not differ between the groups, either in pain on day of hospital discharge (intercept: -0.1 [95% CI: -0.8 to 0.6], P = 0.746) or in reductions over time (slope: 0.1 pain units per log of time [95% CI: 0-0.2], P = 0.057). In planned secondary analyses, postoperative opioid use ended earlier in the oxytocin group and oxytocin-treated patients walked nearly 1000 more steps daily at 8 weeks ( P < 0.001) and exhibited a clinically meaningful reduction in disability for the first 21 postoperative days ( P = 0.007) compared with saline placebo. Intrathecal oxytocin before hip replacement surgery does not speed recovery from worst daily pain. Secondary analyses suggest that further study of intrathecal oxytocin to speed functional recovery without worsening pain after surgery is warranted.
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Affiliation(s)
- James C. Eisenach
- Department of Anesthesiology, Wake Forest University School of Medicine (WFUSM), Winston-Salem, NC, USA
| | | | - Robert S. Weller
- Department of Anesthesiology, Wake Forest University School of Medicine (WFUSM), Winston-Salem, NC, USA
| | - Regina S. Curry
- Department of Anesthesiology, Wake Forest University School of Medicine (WFUSM), Winston-Salem, NC, USA
| | | | - Daryl S. Henshaw
- Department of Anesthesiology, Wake Forest University School of Medicine (WFUSM), Winston-Salem, NC, USA
| | | | - Christopher J. Edwards
- Department of Anesthesiology, Wake Forest University School of Medicine (WFUSM), Winston-Salem, NC, USA
| | | | - Timothy T. Houle
- Department of Anesthesiology and Perioperative Medicine, Harvard Medical School, Massachusetts General Hospital, Boston, MA, USA
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Brackley AD, Toney GM. Oxytocin Receptor Activation Rescues Opioid-Induced Respiratory Depression by Systemic Fentanyl in the Rat. J Pharmacol Exp Ther 2021; 378:96-107. [PMID: 33990416 DOI: 10.1124/jpet.121.000535] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 05/11/2021] [Indexed: 12/22/2022] Open
Abstract
Opioid overdose intervention by naloxone, a high affinity receptor antagonist, reverses opioid-induced respiratory depression (OIRD) and analgesia by displacing opioids. Systemic naloxone stimulates release of the hypothalamic neuropeptide oxytocin, which has analgesic properties and participates in cardiorespiratory homeostasis. To test the hypothesis that oxytocin can reverse OIRD, we assessed the rescue potential of graded doses (0, 0.1, 2, 5, 10, 50 nmol/kg, i.v.) of oxytocin to counter fentanyl (60 nmol/kg, i.v.)-induced depression of neural inspiration indexed by recording phrenic nerve activity (PNA) in anesthetized (urethane/α-chloralose), vagotomized, and artificially ventilated rats. Oxytocin dose-dependently rescued fentanyl OIRD by almost immediately reversing PNA burst arrest (P = 0.0057) and restoring baseline burst frequency (P = 0.0016) and amplitude (P = 0.0025) at low but not high doses, resulting in inverted bell-shaped dose-response curves. Oxytocin receptor antagonism (40 nmol/kg, i.v.) prevented oxytocin reversal of OIRD (arrest: P = 0.0066, frequency: P = 0.0207, amplitude: P = 0.0022). Vasopressin 1A receptor (V1aR) antagonism restored high-dose oxytocin efficacy to rescue OIRD (P = 0.0170 to P < 0.0001), resulting in classic sigmoidal dose-response curves, and prevented (P = 0.0135) transient hypertension from V1aR cross-activation (P = 0.0275). Alone, vasopressin (5 nmol/kg, i.v.) failed to reverse fentanyl respiratory arrest (P = 0.6184). The nonpeptide oxytocin receptor agonist WAY-267464 (75 nmol/kg, i.v.), which has V1aR antagonist properties, quickly reversed fentanyl OIRD (P < 0.0001), with rapid recovery of PNA frequency (P = 0.0011) and amplitude (P = 0.0044) without adverse hemodynamic consequences (P = 0.9991). Findings indicate that peptide and nonpeptide agonist activation of oxytocin receptors without V1aR cross-activation rescues fentanyl OIRD. Oxytocin receptor agonists could be lifesaving resuscitation agents that enhance rather than interrupt opioid analgesia. SIGNIFICANCE STATEMENT: Oxytocin receptor activation produces analgesia. Here, we demonstrate that activation by the US Food and Drug Administration-approved agonist oxytocin and the nonpeptide partial agonist WAY-267464 can each reverse fentanyl cardiorespiratory depression. Selective targeting of oxytocin receptors for resuscitation from opioid overdose, alone or in combination with an opioid antagonist, could eliminate or attenuate negative side effects associated with traditional opioid receptor antagonism.
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Affiliation(s)
- Allison Doyle Brackley
- Department of Cellular and Integrative Physiology and Center for Biomedical Neuroscience, University of Texas Health San Antonio, San Antonio, TX
| | - Glenn M Toney
- Department of Cellular and Integrative Physiology and Center for Biomedical Neuroscience, University of Texas Health San Antonio, San Antonio, TX
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Guo J, Ba X, Matsuda M, Wei P, Jiang C, Sun W, Xiao L, Xiong D, Liao X, Hao Y. Oxytocin Elicits Itch Scratching Behavior via Spinal GRP/GRPR System. Front Neurosci 2020; 14:581977. [PMID: 33071749 PMCID: PMC7538669 DOI: 10.3389/fnins.2020.581977] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 09/02/2020] [Indexed: 11/23/2022] Open
Abstract
Oxytocin (OT), a neuropeptide involved in the regulation of complex social and sexual behavior in mammals, has been proposed as a treatment for a number of psychiatric disorders including pain. It has been well documented that central administration of OT elicits strong scratching and grooming behaviors in rodents. However, these behaviors were only described as symptoms, few studies have investigated their underlying neural mechanisms. Thus, we readdressed this question and undertook an analysis of spinal circuits underlying OT-induced scratching behavior in the present study. We demonstrated that intrathecal OT induced robust but transient hindpaw scratching behaviors by activating spinal OT receptors (OTRs). Combining the pre-clinical and clinical evidence, we speculated that OT-induced scratching may be an itch symptom. Further RNAscope studies revealed that near 80% spinal GRP neurons expressed OTRs. OT activated the expression of c-fos mRNA in spinal GRP neurons. Chemical ablation of GRPR neurons significantly reduced intrathecal OT-induced scratching behaviors. Given GRP/GRPR pathway plays an important role in spinal itch transmission, we proposed that OT binds to the OTRs expressed on the GRP neurons, and activates GRP/GRPR pathway to trigger itch-scratching behaviors in mice. These findings provide novel evidence relevant for advancing understanding of OT-induced behavioral changes, which will be important for the development of OT-based drugs to treat a variety of psychiatric disorders.
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Affiliation(s)
- Jing Guo
- Department of Endocrinology and Metabolism, Shenzhen University General Hospital, Shenzhen, China
| | - Xiyuan Ba
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Megumi Matsuda
- Research Unit for the Neurobiology of Pain, Department of Anesthesiology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - Pengfei Wei
- Department of Endocrinology and Metabolism, Shenzhen University General Hospital, Shenzhen, China
| | - Changyu Jiang
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Wuping Sun
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Lizu Xiao
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Donglin Xiong
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Xiang Liao
- Department of Pain Medicine and Shenzhen Municipal Key Laboratory for Pain Medicine, Shenzhen Nanshan People's Hospital and the 6th Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, China
| | - Yue Hao
- School of Pharmaceutical Science, Health Science Center, Shenzhen University, Shenzhen, China
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6
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Vassal O, Del Carmine P, Desgranges FP, Bouvet L, Lilot M, Gadot N, Timour-Chah Q, Chassard D. Assessment of Neurological Toxicity of Hydroxyethyl Starch 130/0.4 Injected in the Intrathecal Space in Rats. PAIN MEDICINE 2019; 19:2016-2020. [PMID: 29420792 DOI: 10.1093/pm/pny005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Objective Epidural blood patch is the procedure of choice to relieve postdural puncture headache. Hydroxyethyl-starch (HES) has been proposed as a patch in some circumstances such as in the case of hematological disease due to the theoretical risk of neoplastic seeding to the central nervous system. Acute neurological HES toxicity has been excluded by a previous animal study, but the long-term neurological toxicity has not been evaluated. Methods Rats were randomly assigned to one of three groups: no intrathecal injection, 20 μL of intrathecal saline, or a 20-μL intrathecal HES (6% hydroxyethyl starch 130/0.4) administered via a cervical puncture. Clinical daily rat activity was measured before and after dural puncture by actinometry. The rats were killed at day 28, and the spinal cord was surgically removed and stained with hematoxylin-phloxine-saffron for gross and microscopic examination. Results Eleven rats underwent dural puncture without injection, 11 were injected with normal saline, and 12 received intrathecal HES. No clinical or actimetric changes (total distance traveled, number of direction changes, and number of rearings) were observed up to one month after injection. Nonspecific histopathological changes were equally observed in all groups. Conclusions The results of the current study indicate that intrathecal injection of HES in rats does not induce any clinical or histopathological evidence of long-term neuronal toxicity. Further safety studies in animals are warranted before HES might be considered a safe alternative to the classic epidural blood patch.
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Affiliation(s)
- O Vassal
- Department of Anesthesia, Hôpital Femme Mere Enfants (Hospices Civils de Lyon), Lyon, France
| | - P Del Carmine
- Aniphy, Claude Bernard Lyon University, University of Lyon, Lyon, France
| | - F-P Desgranges
- Department of Anesthesia, Hôpital Femme Mere Enfants (Hospices Civils de Lyon), Lyon, France
| | - L Bouvet
- Department of Anesthesia, Hôpital Femme Mere Enfants (Hospices Civils de Lyon), Lyon, France
| | - M Lilot
- Department of Anesthesia, Hôpital Femme Mere Enfants (Hospices Civils de Lyon), Lyon, France
| | - N Gadot
- Anipath, Laennec University, University of Lyon, Lyon, France
| | - Q Timour-Chah
- Aniphy, Claude Bernard Lyon University, University of Lyon, Lyon, France
| | - D Chassard
- Department of Anesthesia, Hôpital Femme Mere Enfants (Hospices Civils de Lyon), Lyon, France
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Mamet J, Yeomans DC, Yaksh TL, Manning DC, Harris S. Editor's Highlight: Formulation and Toxicology Evaluation of the Intrathecal AYX1 DNA-Decoy in Sprague Dawley Rats. Toxicol Sci 2018; 159:76-85. [PMID: 28903493 DOI: 10.1093/toxsci/kfx118] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The longevity of pain after surgery is debilitating and limits the recovery of patients. AYX1 is a double-stranded, unprotected, 23 base-pair oligonucleotide designed to reduce acute post-surgical pain and prevent its chronification with a single intrathecal perioperative dose. AYX1 mimics the DNA sequence normally bound by EGR1 on chromosomes, a transcription factor transiently induced in the dorsal root ganglia-spinal cord network following a noxious input. AYX1 binds to EGR1 and prevents it from launching waves of gene regulation that are necessary to maintain pain over time. A formulation suitable for an intrathecal injection of AYX1 was developed, including a specific ratio of AYX1 and calcium so the ionic homeostasis of the cerebrospinal fluid is maintained and no impact on neuromuscular control is produced upon injection. A GLP toxicology study in naïve Sprague Dawley rats was conducted using 3 dose levels up to the maximum feasible dose. Clinical observations, neurobehavioral observations, clinical pathology and histopathology of the nervous system and peripheral tissues were conducted. An additional nonGLP study was conducted in the spared nerve injury model of chronic neuropathic pain in which EGR1 is induced in the dorsal root ganglia and spinal cord. Similar testing was performed, including a modified Irwin test to assess a potential impact of AYX1 on autonomic nervous system responses, locomotion, activity, arousal, sensorimotor, and neuromuscular function. No AYX1-related adverse events were observed in any of the studies and the no-observed-adverse-effect-level was judged to be the maximum feasible dose.
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Affiliation(s)
| | - David C Yeomans
- Department of Anesthesiology, Stanford University School of Medicine, Stanford, California 94305-5117
| | - Tony L Yaksh
- Departments of Anesthesiology and Pharmacology, Anesthesia Research Laboratory, University of California, San Diego, La Jolla, California 92093
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Dhar D, Poree LR, Yaksh TL. Evolution of the Spinal Delivery of Opiate Analgesics. Neuromodulation 2018. [DOI: 10.1016/b978-0-12-805353-9.00065-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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9
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Exploring Nonopioid Analgesic Agents for Intrathecal Use. Neuromodulation 2018. [DOI: 10.1016/b978-0-12-805353-9.00068-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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10
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Liu S, Pan S, Tan J, Zhao W, Liu F. Oxytocin inhibits ox-LDL-induced adhesion of monocytic THP-1 cells to human brain microvascular endothelial cells. Toxicol Appl Pharmacol 2017; 337:104-110. [PMID: 29104011 DOI: 10.1016/j.taap.2017.10.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2017] [Revised: 10/26/2017] [Accepted: 10/31/2017] [Indexed: 12/28/2022]
Abstract
The attachment of monocytes to human brain microvascular endothelial cells (HBMVEs) caused by oxidized low-density lipoprotein (ox-LDL) is associated with an early event and the pathological progression of cerebrovascular diseases. Oxytocin (OT) is a human peptide hormone that is traditionally used as a medication to facilitate childbirth. However, little information is available regarding the physiological function of OT in brain endothelial dysfunction. In the present study, our results indicate that the oxytocin receptor (OTR) was expressed in human brain microvascular endothelial cells (HBMVEs) and was upregulated in response to ox-LDL in a concentration-dependent manner. Notably, OT significantly suppressed ox-LDL-induced attachment of THP-1 monocytes to HBMVEs. Furthermore, we found that OT reduced the expression of adhesion molecules, such as VCAM-1 and E-selectin. Interestingly, it was shown that OT could restore ox-LDL-induced reduction of KLF4 in HBMVEs. Importantly, knockdown of KLF4 abolished the inhibitory effects of OT on ox-LDL-induced expressions of VCAM-1 and E-selectin as well as the adhesion of human monocytic THP-1 cells to endothelial HBMVEs. Mechanistically, we found that the stimulatory effects of OT on KLF4 expression are mediated by the MEK5/MEF2A pathway.
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Affiliation(s)
- Shuyan Liu
- Department of neurology, Danyang People's Hospital of Jiangsu Province, Danyang, Jiangsu 212300, China
| | - Shengying Pan
- Department of neurology, Danyang People's Hospital of Jiangsu Province, Danyang, Jiangsu 212300, China
| | - Jing Tan
- Department of neurology, Danyang People's Hospital of Jiangsu Province, Danyang, Jiangsu 212300, China
| | - Weina Zhao
- Department of neurology, Hongqi Hospital Affiliated to Mudanjiang Medical university, Mudanjiang, Heilongjiang 157000, China
| | - Fengguo Liu
- Department of neurology, Danyang People's Hospital of Jiangsu Province, Danyang, Jiangsu 212300, China; Department of neurology, Hongqi Hospital Affiliated to Mudanjiang Medical university, Mudanjiang, Heilongjiang 157000, China.
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11
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Preclinical Toxicity Screening of Intrathecal Oxytocin in Rats and Dogs: Erratum. Anesthesiology 2017; 126:1209. [DOI: 10.1097/aln.0000000000001624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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12
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Nessren MAER, Omyma GA, Ebtihal AAEA, Ayman MO, Amel T. Oxytocin ameliorates the deleterious effect of pain in adult male rats. JOURNAL OF PHYSIOLOGY AND PATHOPHYSIOLOGY 2017; 8:1-6. [DOI: 10.5897/jpap2016.0107] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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13
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Eisenach JC, Yaksh TL. Ethical Concerns Regarding Human Study. CNS Neurosci Ther 2016; 22:866. [PMID: 27577599 DOI: 10.1111/cns.12604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2016] [Revised: 07/27/2016] [Accepted: 07/28/2016] [Indexed: 11/30/2022] Open
Affiliation(s)
- James C Eisenach
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA.
| | - Tony L Yaksh
- Department of Anesthesiology, University of California, San Diego, CA, USA
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The antinociception of oxytocin on colonic hypersensitivity in rats was mediated by inhibition of mast cell degranulation via Ca(2+)-NOS pathway. Sci Rep 2016; 6:31452. [PMID: 27538454 PMCID: PMC4990927 DOI: 10.1038/srep31452] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 07/18/2016] [Indexed: 12/17/2022] Open
Abstract
This study was conducted to investigate the effects of oxytocin (OT) on visceral hypersensitivity/pain and mast cell degranulation and the underlying mechanisms. We found that oxytocin receptor (OTR) was expressed in colonic mast cells in humans and rats, as well as in human mast cell line-1 (HMC-1), rat basophilic leukemia cell line (RBL-2H3) and mouse mastocytoma cell line (P815). OT decreased 2,4,6-trinitrobenzene sulfonic acid (TNBS)-induced visceral hypersensitivity, colonic mast cell degranulation and histamine release after mast cell degranulation in rats. Also, OT attenuated the compound 48/80 (C48/80)-evoked histamine release in P815 cells and inward currents, responsible for the mast cell degranulation, in HMC-1, RBL-2H3 and P815 cells. Moreover, these protective effects of OT against visceral hypersensitivity and mast cell degranulation were eliminated by coadministration of OTR antagonist atosiban or a nonselective inhibitor of nitric oxide synthase (NOS), NG-Methyl-L-arginine acetate salt (L-NMMA). Notably, OT evoked a concentration-dependent increase of intracellular Ca2+ in HMC-1, RBL-2H3 and P815 cells, which was responsible for the activation of neuronal NOS (NOS1) and endothelial NOS (NOS3). Our findings strongly suggest that OT might exert the antinociception on colonic hypersensitivity through inhibition of mast cell degranulation via Ca2+-NOS pathway.
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Condés-Lara M, Zayas-González H, Manzano-García A, Córdova-Quiroz E, Granados-Mortera J, García-Cuevas M, Morales-Gómez J, González-Hernández A. Successful Pain Management with Epidural Oxytocin. CNS Neurosci Ther 2016; 22:532-4. [PMID: 27080720 DOI: 10.1111/cns.12551] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Revised: 03/22/2016] [Accepted: 03/23/2016] [Indexed: 11/26/2022] Open
Affiliation(s)
- Miguel Condés-Lara
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, México
| | - Héctor Zayas-González
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, México.,Hospital Regional de Petróleos Mexicanos, Salamanca, Guanajuato, México
| | - Alfredo Manzano-García
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, México
| | | | | | | | | | - Abimael González-Hernández
- Departamento de Neurobiología del Desarrollo y Neurofisiología, Instituto de Neurobiología, Universidad Nacional Autónoma de México, Querétaro, México
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16
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Oxytocin-secreting system: A major part of the neuroendocrine center regulating immunologic activity. J Neuroimmunol 2015; 289:152-61. [PMID: 26616885 DOI: 10.1016/j.jneuroim.2015.11.001] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 07/22/2015] [Accepted: 11/02/2015] [Indexed: 02/07/2023]
Abstract
Interactions between the nervous system and immune system have been studied extensively. However, the mechanisms underlying the neural regulation of immune activity, particularly the neuroendocrine regulation of immunologic functions, remain elusive. In this review, we provide a comprehensive examination of current evidence on interactions between the immune system and hypothalamic oxytocin-secreting system. We highlight the fact that oxytocin may have significant effects in the body, beyond its classical functions in lactation and parturition. Similar to the hypothalamo-pituitary-adrenal axis, the oxytocin-secreting system closely interacts with classical immune system, integrating both neurochemical and immunologic signals in the central nervous system and in turn affects immunologic defense, homeostasis, and surveillance. Lastly, this review explores therapeutic potentials of oxytocin in treating immunologic disorders.
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17
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Guedon JMG, Wu S, Zheng X, Churchill CC, Glorioso JC, Liu CH, Liu S, Vulchanova L, Bekker A, Tao YX, Kinchington PR, Goins WF, Fairbanks CA, Hao S. Current gene therapy using viral vectors for chronic pain. Mol Pain 2015; 11:27. [PMID: 25962909 PMCID: PMC4446851 DOI: 10.1186/s12990-015-0018-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 04/01/2015] [Indexed: 02/07/2023] Open
Abstract
The complexity of chronic pain and the challenges of pharmacotherapy highlight the importance of development of new approaches to pain management. Gene therapy approaches may be complementary to pharmacotherapy for several advantages. Gene therapy strategies may target specific chronic pain mechanisms in a tissue-specific manner. The present collection of articles features distinct gene therapy approaches targeting specific mechanisms identified as important in the specific pain conditions. Dr. Fairbanks group describes commonly used gene therapeutics (herpes simplex viral vector (HSV) and adeno-associated viral vector (AAV)), and addresses biodistribution and potential neurotoxicity in pre-clinical models of vector delivery. Dr. Tao group addresses that downregulation of a voltage-gated potassium channel (Kv1.2) contributes to the maintenance of neuropathic pain. Alleviation of chronic pain through restoring Kv1.2 expression in sensory neurons is presented in this review. Drs Goins and Kinchington group describes a strategy to use the replication defective HSV vector to deliver two different gene products (enkephalin and TNF soluble receptor) for the treatment of post-herpetic neuralgia. Dr. Hao group addresses the observation that the pro-inflammatory cytokines are an important shared mechanism underlying both neuropathic pain and the development of opioid analgesic tolerance and withdrawal. The use of gene therapy strategies to enhance expression of the anti-pro-inflammatory cytokines is summarized. Development of multiple gene therapy strategies may have the benefit of targeting specific pathologies associated with distinct chronic pain conditions (by Guest Editors, Drs. C. Fairbanks and S. Hao).
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Affiliation(s)
- Jean-Marc G Guedon
- Graduate Program in Molecular Virology and Microbiology, University of Pittsburgh, School of Medicine, Pittsburgh, PA, 15213, USA. .,Department of Ophthalmology, University of Pittsburgh School of Medicine, Room 1020 EEI, 203 Lothrop Street, Pittsburgh, PA, 15213, USA.
| | - Shaogen Wu
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, 185 S. Orange Ave., MSB, F-548, Newark, NJ, 07103, USA.
| | - Xuexing Zheng
- Department of Anesthesiology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
| | | | - Joseph C Glorioso
- Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 424 Bridgeside Point II, 450 Technology Drive, Pittsburgh, PA, 15219, USA.
| | - Ching-Hang Liu
- Department of Anesthesiology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
| | - Shue Liu
- Department of Anesthesiology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
| | - Lucy Vulchanova
- Department of Neuroscience, University of Minnesota, Minneapolis, MN, USA.
| | - Alex Bekker
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, 185 S. Orange Ave., MSB, F-548, Newark, NJ, 07103, USA.
| | - Yuan-Xiang Tao
- Department of Anesthesiology, New Jersey Medical School, Rutgers, State University of New Jersey, 185 S. Orange Ave., MSB, F-548, Newark, NJ, 07103, USA. .,Department of Cell Biology & Molecular Medicine, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ, 07103, USA. .,Department of Neurology & Neuroscience, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ, 07103, USA. .,Department of Physiology & Pharmacology, New Jersey Medical School, Rutgers, State University of New Jersey, Newark, NJ, 07103, USA.
| | - Paul R Kinchington
- Graduate Program in Molecular Virology and Microbiology, University of Pittsburgh, School of Medicine, Pittsburgh, PA, 15213, USA. .,Department of Ophthalmology, University of Pittsburgh School of Medicine, Room 1020 EEI, 203 Lothrop Street, Pittsburgh, PA, 15213, USA.
| | - William F Goins
- Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, 424 Bridgeside Point II, 450 Technology Drive, Pittsburgh, PA, 15219, USA.
| | - Carolyn A Fairbanks
- Department of Pharmaceutics, University of Minnesota, Minneapolis, MN, USA. .,Department of Neuroscience, University of Minnesota, Minneapolis, MN, USA. .,Department of Pharmacology, University of Minnesota, 9-177 Weaver Densford Hall, 308 Harvard Street, Minneapolis, MN, 55455, USA.
| | - Shuanglin Hao
- Department of Anesthesiology, University of Miami Miller School of Medicine, Miami, FL, 33136, USA.
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18
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Fairbanks CA, Goracke-Postle CJ. Neurobiological studies of chronic pain and analgesia: Rationale and refinements. Eur J Pharmacol 2015; 759:169-81. [PMID: 25818751 DOI: 10.1016/j.ejphar.2015.03.049] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Revised: 03/05/2015] [Accepted: 03/12/2015] [Indexed: 12/27/2022]
Abstract
Chronic pain is a complex condition for which the need for specialized research and therapies has been recognized internationally. This review summarizes the context for the international call for expansion of pain research to improve our understanding of the mechanisms underlying pain in order to achieve improvements in pain management. The methods for conducting sensory assessment in animal models are discussed and the development of animal models of chronic pain is specifically reviewed, with an emphasis on ongoing refinements to more closely mimic a variety of human pain conditions. Pharmacological correspondences between pre-clinical pain models and the human clinical experience are noted. A discussion of the 3Rs Framework (Replacement, Reduction, Refinement) and how each may be considered in pain research is featured. Finally, suggestions are provided for engaging principal investigators, IACUC reviewers, and institutions in the development of strong partnerships to simultaneously expand our knowledge of the mechanisms underlying pain and analgesia while ensuring the humane use of animals in research.
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Affiliation(s)
- Carolyn A Fairbanks
- University of Minnesota, Department of Pharmaceutics, Minneapolis, MN, USA; University of Minnesota, Department of Pharmacology, Minneapolis, MN, USA; University of Minnesota, Department of Neuroscience, Minneapolis, MN, USA.
| | - Cory J Goracke-Postle
- University of Minnesota, Office of the Vice President for Research, Minneapolis, MN, USA
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Abstract
BACKGROUND Preclinical data suggest that oxytocin reduces hypersensitivity by actions in the spinal cord, but whether it produces antinociception to acute stimuli is unclear. In this article, the authors examined the safety of intrathecal oxytocin and screened its effects on acute noxious stimuli. METHODS After institutional review board and Food and Drug Administration approval, healthy adult volunteers received 5, 15, 50, or 150 μg intrathecal oxytocin in a dose-escalating manner in cohorts of five subjects. Hemodynamic and neurologic assessments were performed for 4 h after injections and 24 h later, at which time serum sodium was also measured. Cerebrospinal fluid was obtained 60 min after injection, and responses to noxious heat stimuli in arm and leg as well as temporal summation to repeated application of a von Frey filament were obtained. RESULTS One subject receiving the highest dose experienced transient hypotension and bradycardia as well as subjective numbness in a lumbo-sacral distribution. No other subject experienced subjective or objective neurologic symptoms. Overall, blood pressure and heart rate increased 1 to 4 h after injection by less than 15% with no dose dependency. There was no effect on serum sodium, and cerebrospinal fluid oxytocin increased in a dose-dependent manner after injection. Pain scores to noxious heat stimuli were unaffected by oxytocin, and the temporal summation protocol failed to show summation before or after drug treatment. CONCLUSION This small study supports further investigation on oxytocin for analgesia for hypersensitivity states, with continued systematic surveillance for possible effects on blood pressure, heart rate, and neurologic function.
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Gong L, Gao F, Li J, Li J, Yu X, Ma X, Zheng W, Cui S, Liu K, Zhang M, Kunze W, Liu CY. Oxytocin-induced membrane hyperpolarization in pain-sensitive dorsal root ganglia neurons mediated by Ca(2+)/nNOS/NO/KATP pathway. Neuroscience 2015; 289:417-28. [PMID: 25617653 DOI: 10.1016/j.neuroscience.2014.12.058] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/11/2014] [Accepted: 12/16/2014] [Indexed: 12/27/2022]
Abstract
Oxytocin (OT) plays an important role in pain modulation and antinociception in the central nervous system. However, little is known about its peripheral effects. This study was conducted to investigate the effect of OT on the electrical properties of neurons in the dorsal root ganglia (DRG) and the underlying mechanisms. DRG neurons from adult rats were acutely dissociated and cultured. Intracellular Ca(2+) was determined by fluorescent microscopy using an indicator dye. The electrical properties of DRG neurons were tested by patch-clamp recording. The oxytocin receptor (OTR) and neuronal nitric oxide synthase (nNOS) on DRG neurons were assessed with immunofluorescence assays. OTR co-localized with nNOS in most of Isolectin B4 (IB4)-binding cultured DRG neurons in rats. OT decreased the excitability, increased the outward current, and evoked the membrane hyperpolarization in cultured DRG neurons. Sodium nitroprusside (SNP), the donor of nitric oxide (NO), exerted similar effects as OT on the membrane potential of cultured DRG neurons. OT increased the production of NO in DRGs and cultured DRG neurons. Pre-treatment of the OTR antagonist atosiban or the selective nNOS inhibitor N-Propyl-l-arginine (NPLA) significantly attenuated the hyperpolarization effect evoked by OT. OT produced a concentration-dependent increase in intracellular Ca(2+) in DRG neurons that responds to capsaicin, which can be attenuated by atosiban, but not by NPLA. OT-evoked membrane hyperpolarization and increase of outward current were distinctly attenuated by glibenclamide, a blocker of ATP-sensitive K(+) (KATP) channel. OT might be an endogenous antinociceptive agent and the peripheral antinociceptive effects of OT are mediated by activation of the Ca(2+)/nNOS/NO/KATP pathway in DRG neurons.
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Affiliation(s)
- L Gong
- Department of Physiology, Shandong University School of Medicine, China
| | - F Gao
- Department of Physiology, Shandong University School of Medicine, China
| | - J Li
- Department of Physiology, Shandong University School of Medicine, China
| | - J Li
- Department of Physiology, Shandong University School of Medicine, China
| | - X Yu
- Department of Physiology, Shandong University School of Medicine, China
| | - X Ma
- Department of Physiology, Shandong University School of Medicine, China
| | - W Zheng
- Department of Physiology, Shandong University School of Medicine, China
| | - S Cui
- Department of Physiology, Shandong University School of Medicine, China
| | - K Liu
- Department of Physiology, Shandong University School of Medicine, China
| | - M Zhang
- Department of Biology, McMaster University, Canada
| | - W Kunze
- The McMaster Brain-Body Institutes, St Joseph's Healthcare, Hamilton, Ontario, Canada
| | - C Y Liu
- Department of Physiology, Shandong University School of Medicine, China; Provincial Key Lab of Mental Disorder, Shandong University School of Medicine, China.
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Quattrocki E, Friston K. Autism, oxytocin and interoception. Neurosci Biobehav Rev 2014; 47:410-30. [PMID: 25277283 PMCID: PMC4726659 DOI: 10.1016/j.neubiorev.2014.09.012] [Citation(s) in RCA: 221] [Impact Index Per Article: 22.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Revised: 07/23/2014] [Accepted: 09/20/2014] [Indexed: 02/08/2023]
Abstract
Autism is a pervasive developmental disorder characterized by profound social and verbal communication deficits, stereotypical motor behaviors, restricted interests, and cognitive abnormalities. Autism affects approximately 1% of children in developing countries. Given this prevalence, identifying risk factors and therapeutic interventions are pressing objectives—objectives that rest on neurobiologically grounded and psychologically informed theories about the underlying pathophysiology. In this article, we review the evidence that autism could result from a dysfunctional oxytocin system early in life. As a mediator of successful procreation, not only in the reproductive system, but also in the brain, oxytocin plays a crucial role in sculpting socio-sexual behavior. Formulated within a (Bayesian) predictive coding framework, we propose that oxytocin encodes the saliency or precision of interoceptive signals and enables the neuronal plasticity necessary for acquiring a generative model of the emotional and social 'self.' An aberrant oxytocin system in infancy could therefore help explain the marked deficits in language and social communication—as well as the sensory, autonomic, motor, behavioral, and cognitive abnormalities—seen in autism.
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Affiliation(s)
- E Quattrocki
- The Wellcome Trust Centre for Neuroimaging, UCL, 12 Queen Square, London WC1N 3BG, UK.
| | - Karl Friston
- The Wellcome Trust Centre for Neuroimaging, UCL, 12 Queen Square, London WC1N 3BG, UK.
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22
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Oxytocin and analgesia: future trends. Trends Pharmacol Sci 2014; 35:549-51. [PMID: 25270768 DOI: 10.1016/j.tips.2014.09.004] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Accepted: 09/08/2014] [Indexed: 11/22/2022]
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