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Drug: Morphine

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Total 25 results found since Jan 2013.

Epigenetics and Pain Research
i-Fect Used to Study ImpactsOur i-Fect siRNA, miRNA and shRNA Trasfection Kit was recently used to study the impact of G9a-specific siRNA (AGUAACGGGCAUCAAUGC) on Mu Opioid Receptors: Yuhao Zhang, Shao-Rui Chen, Geoffroy Laumet, Hong Chen and Hui-Lin Pan. Nerve Injury Diminishes Opioid Analgesia through Lysine Methyltransferase-Mediated Transcriptional Repression of µ-Opioid Receptors in Primary Sensory Neurons. First Published on February 25, 2016, doi: 10.1074/jbc.M115.711812... In some SNL rats, G9a-specific siRNA (4 µg) or the negative control siRNA was administered intrathecally. G9a-specific siRNA(AGUAACGGGCAUC...
Source: siRNA and DsiRNA Transfection Efficiency - March 24, 2016 Category: Neuroscience Tags: epigenetics Ga9 Mu Opioid Receptor inhibitor i-Fect iFect intrathecal delivery of siRNA Morphine neuropathic pain Source Type: news

Injection of Toll-like receptor 4 siRNA into the ventrolateral periaqueductal gray attenuates withdrawal syndrome in morphine-dependent rats.
Authors: Liu QF, Li L, Guo YQ, Li X, Mou ZD, Wang X, Du GZ Abstract We assessed the role of the Toll-like receptor 4 (TLR4) gene in the ventrolateral periaqueductal gray (vlPAG) region of morphine-dependent rats on attenuating withdrawal syndrome, and regulating glutamic acid decarboxylase (GAD67), glutamic acid (Glu), and gamma-aminobutyric acid (GABA). After siRNA-mediated downregulation of TLR4, changes were observed in withdrawal behavior and downstream signaling molecules. Rats were injected into the vlPAG with TLR4 siRNA, followed by intraperitoneal injection of morphine for 5 consecutive days, and then nalox...
Source: Archives Italiennes de Biologie - March 23, 2017 Category: Neuroscience Tags: Arch Ital Biol Source Type: research

Epigenetics and Pain Research
i-Fect Used to Study ImpactsOur i-Fect siRNA, miRNA and shRNA Trasfection Kit was recently used to study the impact of G9a-specific siRNA (AGUAACGGGCAUCAAUGC) on Mu Opioid Receptors: Yuhao Zhang, Shao-Rui Chen, Geoffroy Laumet, Hong Chen and Hui-Lin Pan. Nerve Injury Diminishes Opioid Analgesia through Lysine Methyltransferase-Mediated Transcriptional Repression of µ-Opioid Receptors in Primary Sensory Neurons. First Published on February 25, 2016, doi: 10.1074/jbc.M115.711812... In some SNL rats, G9a-specific siRNA (4 µg) or the negative control siRNA was administered intrathecally. G9a-specific siRNA(AGUAACGGGCAUC...
Source: Neuromics - March 24, 2016 Category: Neuroscience Tags: DOR Dorsal Root Ganglia Ga9 MOR inhibitor i-Fect Morphine Mu Opioid Receptor Neuropathic Pain Source Type: news

Chronic morphine-mediated upregulation of high mobility group box 1 in the spinal cord contributes to analgesic tolerance and hyperalgesia in rats
We examined whether spinal high mobility group box 1 (HMGB1) is involved in morphine tolerance and its underlying mechanisms by using a model of repeated intrathecal (i.t.) injections of morphine. The results showed that chronic i.t. morphine exposure led to increased expression of HMGB1, Toll-like receptor 4 (TLR4), and receptor for advanced glycation end products (RAGE) and their mRNAs in the dorsal horn. Morphine challenge also promoted HMGB1 expression and release in cultured spinal neurons, but these effects were inhibited by TAK-242, naloxone (antagonists of TLR4), and TLR4 siRNA. Intrathecal coadministration of morp...
Source: Neurotherapeutics - December 25, 2019 Category: Neurology Source Type: research

Morphine Modulates Mouse Hippocampal Progenitor Cell Lineages by Upregulating miR‐181a Level
Abstract The mechanism by which addictive drugs such as morphine regulate adult neurogenesis remains elusive. We now demonstrate that morphine can regulate neurogenesis by control of miR‐181a and subsequent hippocampal neural progenitor cell (hNPC) lineages. In the presence of morphine, hNPCs preferentially differentiated into astrocytes, an effect blocked by the specific μ‐opioid receptor antagonist, Cys2‐Tyr3‐Orn5‐Pen7‐amide. This effect was mediated by the Prox1/Notch1 pathway as demonstrated by an increase in Notch1 level in the morphine‐ but not fentanyl‐treated hNPCs and blocked by overexpression of ...
Source: Stem Cells - October 14, 2014 Category: Stem Cells Authors: Chi Xu, Yue Zhang, Hui Zheng, Horace H. Loh, Ping‐Yee Law Tags: Tissue‐Specific Stem Cells Source Type: research

Viruses, Vol. 9, Pages 201: Importance of Autophagy in Mediating Human Immunodeficiency Virus (HIV) and Morphine-Induced Metabolic Dysfunction and Inflammation in Human Astrocytes
Nazira El-Hage Under physiological conditions, the function of astrocytes in providing brain metabolic support is compromised under pathophysiological conditions caused by human immunodeficiency virus (HIV) and opioids. Herein, we examined the role of autophagy, a lysosomal degradation pathway important for cellular homeostasis and survival, as a potential regulatory mechanism during pathophysiological conditions in primary human astrocytes. Blocking autophagy with small interfering RNA (siRNA) targeting BECN1, but not the Autophagy-related 5 (ATG5) gene, caused a significant decrease in HIV and morphine-induced intra...
Source: Viruses - July 28, 2017 Category: Virology Authors: Myosotys Rodriguez Jessica Lapierre Chet Ojha Hary Estrada-Bueno Seth Dever David Gewirtz Fatah Kashanchi Nazira El-Hage Tags: Article Source Type: research

LncRNA MRAK159688 facilitates morphine tolerance by promoting REST-mediated inhibition of mu opioid receptor in rats
Neuropharmacology. 2022 Jan 1;206:108938. doi: 10.1016/j.neuropharm.2021.108938. Online ahead of print.ABSTRACTMorphine tolerance (MT) caused by the long-term use of morphine is a major medical problem. The molecular mechanism of morphine tolerance remains elusive. Here, we established a morphine tolerance model in rats and verified whether the long noncoding RNA (lncRNA) MRAK159688 is involved in morphine tolerance and its specific molecular mechanism. We show the significant upregulation of MRAK159688 expression in the spinal cord of morphine-tolerant rats. Overexpression of MRAK159688 by a lentivirus reduces the analges...
Source: Neuropharmacology - January 4, 2022 Category: Drugs & Pharmacology Authors: Meiling Deng Zengli Zhang Manyu Xing Xia Liang Zhengyiqi Li Jing Wu Shasha Jiang Yingqi Weng Qulian Guo Wangyuan Zou Source Type: research

Role of Tumor Necrosis Factor Receptor 1-Reactive Oxygen Species-Caspase 11 Pathway in Neuropathic Pain Mediated by HIV gp120 With Morphine in Rats
CONCLUSIONS: These results suggest that spinal TNFRI-mtROS-caspase 11 signal pathway plays a critical role in the HIV-associated neuropathic pain state, providing a novel approach to treating chronic pain in PLWH with opioids.PMID:36662639 | DOI:10.1213/ANE.0000000000006335
Source: Anesthesia and Analgesia - January 20, 2023 Category: Anesthesiology Authors: Kentaro Hayashi Hyun Yi Xun Zhu Shue Liu Jun Gu Keiya Takahashi Yuta Kashiwagi Marta Pardo Hirotsugu Kanda Heng Li Roy C Levitt Shuanglin Hao Source Type: research

G protein‐gated inwardly rectifying potassium (GIRK) channels play a primary role in the antinociceptive effect of oxycodone, but not morphine, at supraspinal sites
Conclusion and ImplicationsThe results demonstrated that GIRK1 channels play a primary role in the antinociceptive effects of oxycodone, but not morphine, at supraspinal sites, and suggested that supraspinal GIRK1 channels are responsible for the unique analgesic profile of oxycodone.
Source: British Journal of Pharmacology - October 7, 2013 Category: Drugs & Pharmacology Authors: Atsushi Nakamura, Masahide Fujita, Hiroko Ono, Yoshie Hongo, Tomoe Kanbara, Koichi Ogawa, Yasuhide Morioka, Atsushi Nishiyori, Masahiro Shibasaki, Tomohisa Mori, Tsutomu Suzuki, Gaku Sakaguchi, Akira Kato, Minoru Hasegawa Tags: Research Paper Source Type: research

Heterologous Regulation of Agonist‐Independent μ‐Opioid Receptor Phosphorylation by Protein Kinase C
Conclusions & ImplicationsThe present results unravel novel mechanisms of heterologous regulation of MOR phosphorylation by PKC. These findings represent a useful starting point for definitive experiments elucidating the exact contribution of PKC‐driven MOR phosphorylation to diminished MOR responsiveness in morphine tolerance and pathological pain.
Source: British Journal of Pharmacology - December 6, 2013 Category: Drugs & Pharmacology Authors: Susann Illing, Anika Mann, Stefan Schulz Tags: Research Paper Source Type: research

G protein‐gated inwardly rectifying potassium (KIR3) channels play a primary role in the antinociceptive effect of oxycodone, but not morphine, at supraspinal sites
Conclusion and ImplicationsThese results demonstrate that KIR3.1 channels play a primary role in the antinociceptive effects of oxycodone, but not those of morphine, at supraspinal sites and suggest that supraspinal KIR3.1 channels are responsible for the unique analgesic profile of oxycodone.
Source: British Journal of Pharmacology - December 10, 2013 Category: Drugs & Pharmacology Authors: Atsushi Nakamura, Masahide Fujita, Hiroko Ono, Yoshie Hongo, Tomoe Kanbara, Koichi Ogawa, Yasuhide Morioka, Atsushi Nishiyori, Masahiro Shibasaki, Tomohisa Mori, Tsutomu Suzuki, Gaku Sakaguchi, Akira Kato, Minoru Hasegawa Tags: RESEARCH PAPER Source Type: research

Different Mechanisms of Homologous and Heterologous μ‐Opioid Receptor Phosphorylation
Abstract The efficiency of μ‐opioid receptor (MOR) signaling is tightly regulated and ultimately limited by the coordinated phosphorylation of intracellular serine and threonine residues. Here, we review and discuss recent progress in the generation and application of phosphosite‐specific MOR antibodies, which have proved to be excellent tools for monitoring the spatial and temporal dynamics of receptor phosphorylation and dephosphorylation. Agonist‐induced phosphorylation of MOR occurs at a conserved 10 residue sequence 370TREHPSTANT379 in the receptor's carboxyl‐terminal cytoplasmic tail. Diverse opioids induce ...
Source: British Journal of Pharmacology - February 12, 2014 Category: Drugs & Pharmacology Authors: Anika Mann, Susann Illing, Elke Miess, Stefan Schulz Tags: Review Article – Opioids: New Pathways to Functional Selectivity – Special issue opioids from INRC meeting Themed Issue Source Type: research

Morphine drives internal ribosome entry site-mediated hnRNP K translation in neurons through opioid receptor-dependent signaling
Heterogeneous nuclear ribonucleoprotein K (hnRNP K) binds to the promoter region of mu-opioid receptor (MOR) to regulate its transcriptional activity. How hnRNP K contributes to the analgesic effects of morphine, however, is largely unknown. We provide evidence that morphine increases hnRNP K protein expression via MOR activation in rat primary cortical neurons and HEK-293 cells expressing MORs, without increasing mRNA levels. Using the bicistronic reporter assay, we examined whether morphine-mediated accumulation of hnRNP K resulted from translational control. We identified potential internal ribosome entry site elements ...
Source: Nucleic Acids Research - November 27, 2014 Category: Research Authors: Lee, P.-T., Chao, P.-K., Ou, L.-C., Chuang, J.-Y., Lin, Y.-C., Chen, S.-C., Chang, H.-F., Law, P.-Y., Loh, H. H., Chao, Y.-S., Su, T.-P., Yeh, S.-H. Tags: Gene regulation, Chromatin and Epigenetics Source Type: research