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https://www.readbyqxmd.com/read/29554653/endomorphin-2-inhibits-the-activity-of-the-spinoparabrachial-projection-neuron-through-presynaptic-mechanisms-in-the-spinal-dorsal-horn-in-rats
#1
Jun-Bin Yin, Ya-Cheng Lu, Ban Feng, Zhen-Yu Wu, Ying-Biao Chen, Ting Zhang, Zhen-Zhen Kou, Ming-Ming Zhang, Han Zhang, Jin-Lian Li, Hui Li, Tao Chen, Yu-Lin Dong, Yun-Qing Li
BACKGROUND/AIMS: Spinal dorsal horn (SDH) is one of the most important regions for analgesia produced by endomorphin-2 (EM2), which has a higher affinity and specificity for the µ-opioid receptor (MOR) than morphine. Many studies have focused on substantia gelatinosa (SG, lamina II) neurons to elucidate the cellular basis for its antinociceptive effects. However, the complicated types and local circuits of interneurons in the SG make it difficult to understand the real effects of EM2...
March 15, 2018: Neuro-Signals
https://www.readbyqxmd.com/read/29501769/the-efficacy-of-a-lectin-from-abelmoschus-esculentus-depends-on-central-opioid-receptor-activation-to-reduce-temporomandibular-joint-hypernociception-in-rats
#2
Shirley Moreira Alves, Raul Sousa Freitas, Danielle Rocha do Val, Lorena Vasconcelos Vieira, Ellen Lima de Assis, Francisco Isaac Fernandes Gomes, Carlos Alberto de Almeida Gadelha, Tatiane Santi Gadelha, José Thalles Jocelino Gomes de Lacerda, Juliana Trindade Clemente-Napimoga, Vicente de Paulo Teixeira Pinto, Gerardo Cristino Filho, Mirna Marques Bezerra, Hellíada Vasconcelos Chaves
Abelmoschus esculentus is largely cultivated in Northeastern Brazil for medicinal purposes, e.g. inflammatory conditions. This study aimed to evaluate the efficacy of Abelmoschus esculentus lectin (AEL) in reducing formalin-induced temporomandibular joint inflammatory hypernociception in rats. The behavioral experiments were performed in male Wistar rats (180-240 g). Rats were pre-treated (i.v.) with AEL (0.001, 0.01 or 0.1 mg/kg) 30 min before formalin injection (i.art.). To analyze the possible effect of opioid pathways on AEL efficacy, animals were pre-treated with naloxone or CTOP (μ opioid receptor antagonist), naltrindole (δ opioid receptor antagonist) or nor-binaltorphimine (κ opioid receptor antagonist) (i...
March 1, 2018: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29484959/chronic-total-occlusion-crossing-approach-based-on-plaque-cap-morphology-the-ctop-classification
#3
Fadi Saab, Michael R Jaff, Larry J Diaz-Sandoval, Gwennan D Engen, Theresa N McGoff, George Adams, Ashraf Al-Dadah, Philip P Goodney, Farhan Khawaja, Jihad A Mustapha
PURPOSE: To present the chronic total occlusion (CTO) crossing approach based on plaque cap morphology (CTOP) classification system and assess its ability to predict successful lesion crossing. METHODS: A retrospective analysis was conducted of imaging and procedure data from 114 consecutive symptomatic patients (mean age 69±11 years; 84 men) with claudication (Rutherford category 3) or critical limb ischemia (Rutherford category 4-6) who underwent endovascular interventions for 142 CTOs...
February 1, 2018: Journal of Endovascular Therapy
https://www.readbyqxmd.com/read/29211767/investigating-endogenous-%C3%A2%C2%B5-opioid-receptors-in-human-keratinocytes-as-pharmacological-targets-using-novel-fluorescent-ligand
#4
Cheryl Leong, Christine Neumann, Srinivas Ramasamy, Bhimsen Rout, Lim Yi Wee, Mei Bigliardi-Qi, Paul L Bigliardi
Opioids in skin function during stress response, regeneration, ageing and, particularly in regulating sensation. In chronic pruritus, topical treatment with Naltrexone changes μ-opioid receptor (μ-OR) localization to relieve itch. The molecular mechanisms behind the effects of Naltrexone on μ-OR function in reduction of itching behavior has not been studied. There is an immediate need to understand the endogenous complexity of μ-OR dynamics in normal and pathological skin conditions. Here we evaluate real-time behavior of μ-OR-Endomorphine complexes in the presence of agonist and antagonists...
2017: PloS One
https://www.readbyqxmd.com/read/28856406/panicolytic-like-effects-caused-by-substantia-nigra-pars-reticulata-pretreatment-with-low-doses-of-endomorphin-1-and-high-doses-of-ctop-or-the-nop-receptors-antagonist-jtc-801-in-male-rattus-norvegicus
#5
Juliana Almeida da Silva, Audrey Franceschi Biagioni, Rafael Carvalho Almada, Renato Leonardo de Freitas, Norberto Cysne Coimbra
RATIONALE: Gamma-aminobutyric acid (GABA)ergic neurons of the substantia nigra pars reticulata (SNpr) are connected to the deep layers of the superior colliculus (dlSC). The dlSC, in turn, connect with the SNpr through opioid projections. Nociceptin/orphanin FQ peptide (N/OFQ) is a natural ligand of a Gi protein-coupled nociceptin receptor (ORL1; NOP) that is also found in the SNpr. Our hypothesis is that tectonigral opioid pathways and intranigral orphanin-mediated mechanisms modulate GABAergic nigrotectal connections...
October 2017: Psychopharmacology
https://www.readbyqxmd.com/read/28836121/nerve-decompression-improves-spinal-synaptic-plasticity-of-opioid-receptors-for-pain-relief
#6
To-Jung Tseng, Ming-Ling Yang, Yu-Lin Hsieh, Miau-Hwa Ko, Sung-Tsang Hsieh
Nerve decompression is an essential therapeutic strategy for pain relief clinically; however, its potential mechanism remains poorly understood. Opioid analgesics acting on opioid receptors (OR) within the various regions of the nervous system have been used widely for pain management. We therefore hypothesized that nerve decompression in a neuropathic pain model of chronic constriction injury (CCI) improves the synaptic OR plasticity in the dorsal horn, which is in response to alleviate pain hypersensitivity...
February 2018: Neurotoxicity Research
https://www.readbyqxmd.com/read/28583050/%C3%AE-opioid-and-5-ht1a-receptors-in-the-dorsomedial-hypothalamus-interact-for-the-regulation-of-panic-related-defensive-responses
#7
Camila Marroni Roncon, Paula Shimene de Melo Yamashita, Alana Tercino Frias, Elisabeth Aparecida Audi, Frederico Guilherme Graeff, Norberto Cysne Coimbra, Helio Zangrossi
The dorsomedial hypothalamus (DMH) and the dorsal periaqueductal gray (DPAG) have been implicated in the genesis and regulation of panic-related defensive behaviors, such as escape. Previous results point to an interaction between serotonergic and opioidergic systems within the DPAG to inhibit escape, involving µ-opioid and 5-HT1A receptors (5-HT1AR). In the present study we explore this interaction in the DMH, using escape elicited by electrical stimulation of this area as a panic attack index. The obtained results show that intra-DMH administration of the non-selective opioid receptor antagonist naloxone (0...
June 2017: Journal of Psychopharmacology
https://www.readbyqxmd.com/read/28554847/panicolytic-like-action-of-bradykinin-in-the-dorsal-periaqueductal-gray-through-%C3%AE-opioid-and-b2-kinin-receptors
#8
Caio César Sestile, Jhonatan Christian Maraschin, Vanessa Scalco Gama, Hélio Zangrossi, Frederico Guilherme Graeff, Elisabeth Aparecida Audi
A wealth of evidence has shown that opioid and kinin systems may control proximal defense in the dorsal periaqueductal gray matter (dPAG), a critical panic-associated area. Studies with drugs that interfere with serotonin-mediated neurotransmission suggest that the μ-opioid receptor (MOR) synergistically interacts with the 5-HT1A receptor in the dPAG to inhibit escape, a panic-related behavior. A similar inhibitory effect has also been reported after local administration of bradykinin (BK), which is blocked by the non-selective opioid receptor antagonist naloxone...
September 1, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28554003/opioids-and-opioid-receptors-orchestrate-wound-repair
#9
Ying Wang, Mihir Gupta, Tasneem Poonawala, Mariya Farooqui, Yunfang Li, Fei Peng, Sheldon Rao, Michael Ansonoff, John E Pintar, Kalpna Gupta
We have previously shown that topical opioids including morphine and its congeners promote healing of full thickness ischemic wounds in rats. We examined the contribution of mu opioid receptor (MOPr)-mediated healing of full thickness ischemic wounds using MOPr and delta or kappa opioid receptor knockout (KO) mice. Wound closure in the early (day 5) as well as later phases was delayed in topical morphine or PBS-treated MOPr-KO mice compared with reciprocal treatments of wounds in wild-type (WT) mice. MOPr expression was significantly upregulated at 30 min in the wound margins and colocalized with wound margins and vasculature in the epidermal and dermal layers of the skin...
July 2017: Translational Research: the Journal of Laboratory and Clinical Medicine
https://www.readbyqxmd.com/read/28509855/the-hypnotic-anxiolytic-and-antinociceptive-profile-of-a-novel-%C3%A2%C2%B5-opioid-agonist
#10
Guilherme Carneiro Montes, Bianca Nascimento Monteiro da Silva, Bismarck Rezende, Roberto Takashi Sudo, Vitor Francisco Ferreira, Fernando de Carvalho da Silva, Angelo da Cunha Pinto, Bárbara Vasconcellos da Silva, Gisele Zapata-Sudo
5'-4-Alkyl/aryl-1H-1,2,3-triazole derivatives PILAB 1-12 were synthesized and a pharmacological screening of these derivatives was performed to identify a possible effect on the Central Nervous System (CNS) and to explore the associated mechanisms of action. The mice received a peritoneal injection (100 µmol/kg) of each of the 12 PILAB derivatives 10 min prior to the injection of pentobarbital and the mean hypnosis times were recorded. The mean hypnosis time increased for the mice treated with PILAB 8, which was prevented when mice were administered CTOP, a µ-opioid antagonist...
May 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28347824/participation-of-dorsal-periaqueductal-gray-5-ht1a-receptors-in-the-panicolytic-like-effect-of-the-%C3%AE%C2%BA-opioid-receptor-antagonist-nor-bni
#11
Jhonatan Christian Maraschin, Camila Biesdorf Almeida, Marcel Pereira Rangel, Camila Marroni Roncon, Caio César Sestile, Hélio Zangrossi, Frederico Guilherme Graeff, Elisabeth Aparecida Audi
Panic patients may have abnormalities in serotonergic and opioidergic neurotransmission. The dorsal periaqueductal gray (dPAG) plays an important role in organizing proximal defense, related to panic attacks. The 5-HT1A receptor (5-HT1A -R) is involved in regulating escape behavior that is organized in the dPAG. Activation of κ-opioid receptor (KOR) in this region causes anxiogenic effects. In this study, we investigated the involvement of KOR in regulating escape behavior, using systemic and intra-dPAG injection of the KOR antagonist Nor-BNI...
June 1, 2017: Behavioural Brain Research
https://www.readbyqxmd.com/read/28341346/stimulation-of-%C3%AE-opioid-receptors-dilates-retinal-arterioles-by-neuronal-nitric-oxide-synthase-derived-nitric-oxide-in-rats
#12
Eriko Someya, Asami Mori, Kenji Sakamoto, Kunio Ishii, Tsutomu Nakahara
Opioids contribute to the regulation of cerebral vascular tone. The purpose of this study was to examine the effects of herkinorin, a non-opioid μ-opioid receptor agonist derived from salvinorin A, on blood vessels in the rat retina and to investigate the mechanism underlying the herkinorin-induced retinal vasodilatory response. Ocular fundus images were captured using an original high-resolution digital fundus camera in vivo. The retinal vascular responses were evaluated by measuring the diameter of retinal arterioles in the fundus images...
May 15, 2017: European Journal of Pharmacology
https://www.readbyqxmd.com/read/28107753/role-of-central-opioid-on-the-antinociceptive-effect-of-sulfated-polysaccharide-from-the-red-seaweed-solieria-filiformis-in-induced-temporomandibular-joint-pain
#13
Ianna Wivianne Fernandes Araújo, Hellíada Vasconcelos Chaves, José Mário Pachêco, Danielle Rocha Val, Lorena Vasconcelos Vieira, Rodrigo Santos, Raul Sousa Freitas, Renata Line Rivanor, Valdécio Silvano Monteiro, Juliana Trindade Clemente-Napimoga, Mirna Marques Bezerra, Norma Maria Barros Benevides
This study aimed to investigate the effect of sulfated polysaccharide from red seaweed Solieria filiformis (Fraction F II) in the inflammatory hypernociception in the temporomandibular joint (TMJ) of rats. Male Wistar rats were pretreated (30min) with a subcutaneous injection (s.c.) of vehicle or FII (0.03, 0.3 or 3.0mg/kg) followed by intra-TMJ injection of 1.5% Formalin or 5-hydroxytryptamine (5-HT, 225μg/TMJ). In other set of experiments rats were pretreated (15min) with an intrathecal injection of the non-selective opioid receptors Naloxone, or μ-opioid receptor antagonist CTOP, or δ-opioid receptor Naltridole hydrochloride, or κ-opioid receptor antagonist Nor-Binaltorphimine (Nor-BNI) followed by injection of FII (s...
March 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/27608676/contraceptive-practices-among-women-seeking-termination-of-pregnancy-in-one-public-hospital-in-eastern-cape-south-africa
#14
Ebenezer O Oluwole, Linda Skaal
BACKGROUND: There is significantly high contraceptive knowledge in South Africa, but the uptake of contraceptives is average to low with resultant soaring of unplanned pregnancy and rising statistics of termination of pregnancy (TOP) services. This study aimed to establish the contraceptive practices among women in the South African population seeking TOP in one public hospital in Eastern Cape, South Africa. METHODS: A cross-sectional study was carried out among women seeking TOP in a women's clinic...
August 31, 2016: African Journal of Primary Health Care & Family Medicine
https://www.readbyqxmd.com/read/27601272/berberine-induces-pacemaker-potential-inhibition-via-cgmp-dependent-atp-sensitive-k-channels-by-stimulating-mu-delta-opioid-receptors-in-cultured-interstitial-cells-of-cajal-from-mouse-small-intestine
#15
Hyun Jung Kim, Hyungwoo Kim, Myeong Ho Jung, Young Kyu Kwon, Byung Joo Kim
Berberine is traditionally used to treat gastrointestinal (GI) motility disorders. The interstitial cells of Cajal (ICCs) are the pacemaker cells of the gastrointestinal tract, which are responsible for the production of gut movements. The present study aimed to investigate the effects of berberine on pacemaker potentials (PPs) in cultured ICC clusters from the mouse small intestine, and sought to identify the receptors involved and the underlying mechanisms of action. All experiments were performed on cultured ICCs, and a whole‑cell patch‑clamp configuration was used to record PPs from ICC clusters (current clamp mode)...
October 2016: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27508965/accumbal-%C3%AE-opioid-receptors-modulate-ethanol-intake-in-alcohol-preferring-alko-alcohol-rats
#16
Johanna Uhari-Väänänen, Atso Raasmaja, Pia Bäckström, Ville Oinio, Mikko Airavaara, Petteri Piepponen, Kalervo Kiianmaa
BACKGROUND: The nucleus accumbens shell is a key brain area mediating the reinforcing effects of ethanol (EtOH). Previously, it has been shown that the density of μ-opioid receptors in the nucleus accumbens shell is higher in alcohol-preferring Alko Alcohol (AA) rats than in alcohol-avoiding Alko Non-Alcohol rats. In addition, EtOH releases opioid peptides in the nucleus accumbens and opioid receptor antagonists are able to modify EtOH intake, all suggesting an opioidergic mechanism in the control of EtOH consumption...
October 2016: Alcoholism, Clinical and Experimental Research
https://www.readbyqxmd.com/read/27492364/remifentanil-preconditioning-protects-rat-cardiomyocytes-against-hypoxia-reoxygenation-injury-via-%C3%AE-opioid-receptor-mediated-activation-of-pi3k-akt-and-erk-pathways
#17
Meng-Yun Dou, Hao Wu, Hai-Juan Zhu, Shi-Yun Jin, Ye Zhang, Shu-Fang He
Remifentanil preconditioning has been demonstrated to reduce myocardial ischemia reperfusion injury in rat hearts, while the mechanisms are not fully understood. This study investigated the protective effects of remifentanil against hypoxia-reoxygenation injury in adult rat cardiomyocytes and the mechanisms involving opioid receptors and downstream phosphatidylinositol-3-kinase/protein kinase B (PI3K/Akt) and extracellular signal-regulated kinase (ERK) signaling pathways. Adult rat cardiomyocytes were pretreated with remifentanil at different concentrations and then subjected to 90min hypoxia followed by 120min reoxygenation...
October 15, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27445235/in-vivo-neurochemical-evidence-that-delta1-delta2-and-mu2-opioid-receptors-but-not-mu1-opioid-receptors-inhibit-acetylcholine-efflux-in-the-nucleus-accumbens-of-freely-moving-rats
#18
Yuri Kiguchi, Yuri Aono, Yuriko Watanabe, Seiko Yamamoto-Nemoto, Kunihiko Shimizu, Takehiko Shimizu, Yasuhiro Kosuge, John L Waddington, Kumiko Ishige, Yoshihisa Ito, Tadashi Saigusa
Cholinergic neurons in the nucleus accumbens express delta- and mu-opioid receptors that are thought to inhibit neural activity. Delta- and mu-opioid receptors are divided into delta1- and delta2-opioid receptors and mu1- and mu2-opioid receptors, respectively. We analysed the roles of delta- and mu-opioid receptor subtypes in regulating accumbal acetylcholine efflux of freely moving rats using in vivo microdialysis. Other than naloxonazine, given intraperitoneally, delta- and mu-opioid receptor ligands were administered intracerebrally through the dialysis probe...
October 15, 2016: European Journal of Pharmacology
https://www.readbyqxmd.com/read/27400824/unmet-counselling-need-amongst-women-accessing-an-induced-abortion-service-in-kwazulu-natal-south-africa
#19
Graeme Birdsey, Tamaryn L Crankshaw, Sean Mould, Serela S Ramklass
OBJECTIVES: Provision of objective, evidence-based counselling in the context of induced abortion services is considered global good practise. However, there is limited understanding over the counselling needs of women accessing abortion services, particularly in sub-Saharan Africa. This study aimed to explore the content and quality of pre-abortion counselling amongst women accessing an abortion service in South Africa as well as client experience of the counselling process. Perceptions of nurse counsellors were also sought...
November 2016: Contraception
https://www.readbyqxmd.com/read/26817034/coactivation-of-%C3%AE-and-%C3%AE%C2%BA-opioid-receptors-may-mediate-the-protective-effect-of-testosterone-on-the-development-of-temporomandibular-joint-nociception-in-male-rats
#20
Cristina G Macedo, Leticia E Fanton, Luana Fischer, Claudia Herrera Tambeli
AIMS: To investigate whether the protective effect of testosterone on the development of temporomandibular joint (TMJ) nociception in male rats is mediated by the activation of central opioid mechanisms. METHODS: Experiments were performed on 156 male Wistar rats. A pharmacologic approach was used to assess the ability of opioid receptor antagonists infused into the dorsal portion of the brainstem and adjacent to the caudal component (subnucleus caudalis) of the spinal trigeminal nucleus to block the protective effect of testosterone in male rats...
2016: Journal of Oral & Facial Pain and Headache
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