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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
#1
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
#2
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...
May 26, 2017: Neuropharmacology
https://www.readbyqxmd.com/read/28554003/opioids-and-opioid-receptors-orchestrate-wound-repair
#3
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
#4
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
#5
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
#6
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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 practice. 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...
July 8, 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
#14
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
https://www.readbyqxmd.com/read/26578961/effect-of-acute-fentanyl-treatment-on-synaptic-plasticity-in-the-hippocampal-ca1-region-in-rats
#15
Hai Tian, Yueming Xu, Fucun Liu, Guowei Wang, Sanjue Hu
Postoperative cognitive dysfunction (POCD), mainly characterized by short-term decline of learning and memory, occurs after operations under anesthesia. However, the underlying mechanisms are poorly understood. The μ-opioid receptors (MOR) are highly expressed in interneurons of hippocampus, and is believed to be critical for the dysfunction of synaptic plasticity between hippocampal neurons. Therefore, we investigated the effect of fentanyl, a strong agonist of MOR and often used for anesthesia and analgesia in clinical settings, on hippocampal synaptic plasticity in the Schaffer-collateral CA1 pathway during acute exposure and washout in vitro...
2015: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/26410664/remifentanil-preconditioning-protects-the-small-intestine-against-ischemia-reperfusion-injury-via-intestinal-%C3%AE-and-%C3%AE-opioid-receptors
#16
Jian-Tong Shen, Yun-Sheng Li, Zhi-Qiu Xia, Shi-Hong Wen, Xi Yao, Wen-Jing Yang, Cai Li, Ke-Xuan Liu
BACKGROUND: Intestinal ischemia/reperfusion (I/R) injury can cause a high rate of mortality in the perioperative period. Remifentanil has been reported to provide protection for organs against I/R injury. We hypothesized that remifentanil preconditioning would attenuate the small intestinal injury induced by intestinal I/R. METHODS: We used both an in vivo rat model of intestinal I/R injury and a cell culture model using IEC-6 cells (the rat intestinal epithelial cell line) subjected to oxygen and glucose deprivation (OGD)...
February 2016: Surgery
https://www.readbyqxmd.com/read/26363194/opiorphin-causes-a-panicolytic-like-effect-in-rat-panic-models-mediated-by-%C3%AE-opioid-receptors-in-the-dorsal-periaqueductal-gray
#17
Jhonatan Christian Maraschin, Marcel Pereira Rangel, Antonio Joaquim Bonfim, Mariana Kitayama, Frederico Guilherme Graeff, Hélio Zangrossi, Elisabeth Aparecida Audi
Reported evidence indicates that endogenous opioid peptides regulate the expression of escape behavior in rats, a panic-related defensive response, through μ-opioid receptors (MORs) in the dorsal periaqueductal gray (dPAG). These peptides are rapidly catabolized by degrading enzymes, including neutral endopeptidase (NEP) and aminopeptidase N (APN). Opiorphin is a peptide inhibitor of both NEP and APN and potentiates the action of endogenous enkephalins. This study evaluated the effects of intravenous and intra-dPAG administration of opiorphin on escape responses in the elevated T-maze and in a dPAG electrical stimulation test in rats...
February 2016: Neuropharmacology
https://www.readbyqxmd.com/read/26320545/pharmacological-evidence-for-the-mediation-of-the-panicolytic-effect-of-fluoxetine-by-dorsal-periaqueductal-gray-matter-%C3%AE-opioid-receptors
#18
Camila Marroni Roncon, Rafael Carvalho Almada, Jhonatan Christian Maraschin, Elisabeth Aparecida Audi, Hélio Zangrossi, Frederico Guilherme Graeff, Norberto Cysne Coimbra
Previously reported results have shown that the inhibitory effect of fluoxetine on escape behavior, interpreted as a panicolytic-like effect, is blocked by pretreatment with either the opioid receptor antagonist naloxone or the 5-HT1A receptor (5-HT1A-R) antagonist WAY100635 via injection into the dorsal periaqueductal gray matter (dPAG). Additionally, reported evidence indicates that the μ-opioid receptor (MOR) interacts with the 5-HT1A-R in the dPAG. In the present work, pretreatment of the dPAG with the selective MOR blocker CTOP antagonized the anti-escape effect of chronic fluoxetine (10 mg/kg, i...
December 2015: Neuropharmacology
https://www.readbyqxmd.com/read/26134641/pronociceptive-and-antinociceptive-effects-of-buprenorphine-in-the-spinal-cord-dorsal-horn-cover-a-dose-range-of-four-orders-of-magnitude
#19
Katharina J Gerhold, Ruth Drdla-Schutting, Silke D Honsek, Liesbeth Forsthuber, Jürgen Sandkühler
Due to its distinct pharmacological profile and lower incidence of adverse events compared with other opioids, buprenorphine is considered a safe option for pain and substitution therapy. However, despite its wide clinical use, little is known about the synaptic effects of buprenorphine in nociceptive pathways. Here, we demonstrate dose-dependent, bimodal effects of buprenorphine on transmission at C-fiber synapses in rat spinal cord dorsal horn in vivo. At an analgesically active dose of 1500 μg·kg(-1), buprenorphine reduced the strength of spinal C-fiber synapses...
July 1, 2015: Journal of Neuroscience: the Official Journal of the Society for Neuroscience
https://www.readbyqxmd.com/read/26074773/inhibitory-effects-of-endomorphin-2-on-excitatory-synaptic-transmission-and-the-neuronal-excitability-of-sacral-parasympathetic-preganglionic-neurons-in-young-rats
#20
Ying-Biao Chen, Fen-Sheng Huang, Ban Fen, Jun-Bin Yin, Wei Wang, Yun-Qing Li
The function of the urinary bladder is partly controlled by parasympathetic preganglionic neurons (PPNs) of the sacral parasympathetic nucleus (SPN). Our recent work demonstrated that endomorphin-2 (EM-2)-immunoreactive (IR) terminals form synapses with μ-opioid receptor (MOR)-expressing PPNs in the rat SPN. Here, we examined the effects of EM-2 on excitatory synaptic transmission and the neuronal excitability of the PPNs in young rats (24-30 days old) using a whole-cell patch-clamp approach. PPNs were identified by retrograde labeling with the fluorescent tracer tetramethylrhodamine-dextran (TMR)...
2015: Frontiers in Cellular Neuroscience
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