1
|
Mobini Kesheh M, Shavandi S, Azami J, Esghaei M, Keyvani H. Genetic diversity and bioinformatic analysis in the L1 gene of HPV genotypes 31, 33, and 58 circulating in women with normal cervical cytology. Infect Agent Cancer 2023; 18:19. [PMID: 36959610 PMCID: PMC10037780 DOI: 10.1186/s13027-023-00499-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Accepted: 03/16/2023] [Indexed: 03/25/2023] Open
Abstract
BACKGROUND HPV-31, -33, and -58, along with HPV-45 and -52, account for almost 11% of HPV-associated cancers. Our previous studies showed that after HPV-16 and -51, HPV-58 was common and HPV-31 was as frequent as HPV-18 among Iranian women with normal cytology. Hence, in this study, we aimed to investigate the intra-type variations in L1 genes of HPV-58, -31, and -33 to find the predominant lineages circulating in women with normal cytology. METHODS Complete coding sequencing of the L1 gene was amplified and nucleotide and amino acid sequences were compared to those of the references. The selective pressure on L1 protein and whether the variations of the L1 genes embed in L1 loops, or N-glycosylated sites were also investigated. RESULTS B1, A, and A1 (sub)lineages were common in the HPV-58, -33, and -31 samples, respectively. Ninety nucleotide mutations were observed. Twenty nine nucleotide changes corresponded to nonsynonymous substitutions in which seventeen mutations were located in L1 loops. Only one codon position in HPV-58 sequences was found as the positive selection. No difference was observed in N-glycosylation sites between reference and understudied amino acid sequences. CONCLUSION In the current study, we reported, for the first time, the (sub) lineages, amino acid, and genetic diversity in the L1 gene of circulating HPV-58, -33, and -31, in women with normal cytology, in Iran. Such studies can not only have epidemiological values, but also aid to set vaccination programs.
Collapse
Affiliation(s)
- Mina Mobini Kesheh
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Sara Shavandi
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Jalil Azami
- Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Maryam Esghaei
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Hossein Keyvani
- Department of Virology, School of Medicine, Iran University of Medical Sciences, Tehran, Iran.
| |
Collapse
|
2
|
Karami Fath M, Azami J, Jaafari N, Akbari Oryani M, Jafari N, Karim poor A, Azargoonjahromi A, Nabi-Afjadi M, Payandeh Z, Zalpoor H, Shanehbandi D. Exosome application in treatment and diagnosis of B-cell disorders: leukemias, multiple sclerosis, and arthritis rheumatoid. Cell Mol Biol Lett 2022; 27:74. [PMID: 36064322 PMCID: PMC9446857 DOI: 10.1186/s11658-022-00377-x] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 08/16/2022] [Indexed: 11/10/2022] Open
Abstract
Exosomes, known as a type of extracellular vesicles (EVs), are lipid particles comprising heterogeneous contents such as nucleic acids, proteins, and DNA. These bi-layered particles are naturally released into the extracellular periphery by a variety of cells such as neoplastic cells. Given that exosomes have unique properties, they can be used as vectors and carriers of biological and medicinal particles like drugs for delivering to the desired areas. The proteins and RNAs being encompassed by the circulating exosomes in B-cell malignancies are deemed as the promising sources for diagnostic and prognostic biomarkers, as well as therapeutic agents. Exosomes can also provide a "snapshot" view of the tumor and metastatic landscape at any particular time. Further, clinical research has shown that exosomes are produced by immune cells such as dendritic cells can stimulate the immune system, so these exosomes can be used in antitumor vaccines. Despite the great potential of exosomes in the fields of diagnostic and treatment, further studies are in need for these purposes to reach a convergence notion. This review highlights the applications of exosomes in multiple immune-related diseases, including chronic lymphocytic leukemia, multiple sclerosis, and arthritis rheumatoid, as well as explaining sundry aspects of exosome therapy and the function of exosomes in diagnosing diseases.
Collapse
Affiliation(s)
- Mohsen Karami Fath
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Jalil Azami
- Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Niloofar Jaafari
- Department of Hematology and Blood Banking, Faculty of Allied Medicine, Iran University of Medical Sciences, Tehran, Iran
| | - Mahsa Akbari Oryani
- Department of Pathology, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Nafiseh Jafari
- Department of Microbiology, Faculty of Advanced Science and Technology, Tehran Medical Science, Islamic Azad University, Tehran, Iran
| | | | | | - Mohsen Nabi-Afjadi
- Department of Biochemistry, Faculty of Biological Science, Tarbiat Modares University, Tehran, Iran
| | - Zahra Payandeh
- Department Medical Biochemistry and Biophysics, Division Medical Inflammation Research, Karolinska Institute, Stockholm, Sweden
- Immunology Research center, Tabriz University of Medical Science, Tabriz, Iran
| | - Hamidreza Zalpoor
- Shiraz Neuroscience Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
- Network of Immunity in Infection, Malignancy & Autoimmunity (NIIMA), Universal Scientific Education & Research Network (USERN), Tehran, Iran
| | - Dariush Shanehbandi
- Department Medical Biochemistry and Biophysics, Division Medical Inflammation Research, Karolinska Institute, Stockholm, Sweden
- Immunology Research center, Tabriz University of Medical Science, Tabriz, Iran
| |
Collapse
|
3
|
Karami Fath M, Azami J, Masoudi A, Mosaddeghi Heris R, Rahmani E, Alavi F, Alagheband Bahrami A, Payandeh Z, Khalesi B, Dadkhah M, Pourzardosht N, Tarhriz V. Exosome-based strategies for diagnosis and therapy of glioma cancer. Cancer Cell Int 2022; 22:262. [PMID: 35989351 PMCID: PMC9394011 DOI: 10.1186/s12935-022-02642-7] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Accepted: 06/26/2022] [Indexed: 11/10/2022] Open
Abstract
Glioblastoma belongs to the most aggressive type of cancer with a low survival rate that is characterized by the ability in forming a highly immunosuppressive tumor microenvironment. Intercellular communication are created via exosomes in the tumor microenvironment through the transport of various biomolecules. They are primarily involved in tumor growth, differentiation, metastasis, and chemotherapy or radiation resistance. Recently several studies have highlighted the critical role of tumor-derived exosomes against immune cells. According to the structural and functional properties, exosomes could be essential instruments to gain a better molecular mechanism for tumor understanding. Additionally, they are qualified as diagnostic/prognostic markers and therapeutic tools for specific targeting of invasive tumor cells such as glioblastomas. Due to the strong dependency of exosome features on the original cells and their developmental status, it is essential to review their critical modulating molecules, clinical relevance to glioma, and associated signaling pathways. This review is a non-clinical study, as the possible role of exosomes and exosomal microRNAs in glioma cancer are reported. In addition, their content to overcome cancer resistance and their potential as diagnostic biomarkers are analyzed.
Collapse
Affiliation(s)
- Mohsen Karami Fath
- Department of Cellular and Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Jalil Azami
- Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Alireza Masoudi
- Department of Laboratory Sciences, Faculty of Alied Medical Sciences, Qom University of Medical Sciences, Qom, Iran
| | | | - Elnaz Rahmani
- Department of Clinical Pharmacy, Faculty of Pharmacy, Kerman University of Medical Sciences, Kerman, Iran
| | - Fatemeh Alavi
- Department of Pathobiology, Faculty of Specialized Veterinary Sciences, Science and Research Branch, Islamic Azad University, Tehran, Iran
| | - Armina Alagheband Bahrami
- Department of Biotechnology, School of Advanced Technologies in Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Zahra Payandeh
- Department Medical Biochemistry and Biophysics, Division Medical Inflammation Research, Karolinska Institute, Stockholm, Sweden
| | - Bahman Khalesi
- Department of Research and Production of Poultry Viral Vaccine, Razi Vaccine and Serum Research, Tabriz, Iran
| | - Masoomeh Dadkhah
- Pharmaceutical Sciences Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Navid Pourzardosht
- Biochemistry Department, Guilan University of Medical Sciences, Rasht, Iran
| | - Vahideh Tarhriz
- Molecular Medicine Research Center, Biomedicine Institute, Tabriz University of Medical Sciences, Tabriz, Iran
| |
Collapse
|
4
|
Hozhabri H, Ghasemi Dehkohneh RS, Razavi SM, Razavi SM, Salarian F, Rasouli A, Azami J, Ghasemi Shiran M, Kardan Z, Farrokhzad N, Mikaeili Namini A, Salari A. Comparative analysis of protein-protein interaction networks in metastatic breast cancer. PLoS One 2022; 17:e0260584. [PMID: 35045088 PMCID: PMC8769308 DOI: 10.1371/journal.pone.0260584] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 11/12/2021] [Indexed: 12/27/2022] Open
Abstract
Metastatic lesions leading causes of the majority of deaths in patients with the breast cancer. The present study aimed to provide a comprehensive analysis of the differentially expressed genes (DEGs) in the brain (MDA-MB-231 BrM2) and lung (MDA-MB-231 LM2) metastatic cell lines obtained from breast cancer patients compared with those who have primary breast cancer. We identified 981 and 662 DEGs for brain and lung metastasis, respectively. Protein-protein interaction (PPI) analysis revealed seven shared (PLCB1, FPR1, FPR2, CX3CL1, GABBR2, GPR37, and CXCR4) hub genes between brain and lung metastasis in breast cancer. Moreover, GNG2 and CXCL8, C3, and PTPN6 in the brain and SAA1 and CCR5 in lung metastasis were found as unique hub genes. Besides, five co-regulation of clusters via seven important co-expression genes (COL1A2, LUM, SPARC, THBS2, IL1B, CXCL8, THY1) were identified in the brain PPI network. Clusters screening followed by biological process (BP) function and pathway enrichment analysis for both metastatic cell lines showed that complement receptor signalling, acetylcholine receptor signalling, and gastric acid secretion pathways were common between these metastases, whereas other pathways were site-specific. According to our findings, there are a set of genes and functional pathways that mark and mediate breast cancer metastasis to the brain and lungs, which may enable us understand the molecular basis of breast cancer development in a deeper levele to the brain and lungs, which may help us gain a more complete understanding of the molecular underpinnings of breast cancer development.
Collapse
Affiliation(s)
- Hossein Hozhabri
- Institute of Biochemistry and Biophysics, University of Tehran, Tehran, Iran
- Salari Institute of Cognitive and Behavioral Disorders (SICBD), Karaj, Alborz, Iran
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
| | - Roxana Sadat Ghasemi Dehkohneh
- Salari Institute of Cognitive and Behavioral Disorders (SICBD), Karaj, Alborz, Iran
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Cell and Molecular Biology and Microbiology, Faculty of Biological Science and Technology, University of Isfahan, Isfahan, Iran
| | - Seyed Morteza Razavi
- Salari Institute of Cognitive and Behavioral Disorders (SICBD), Karaj, Alborz, Iran
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Cell and Molecular Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
- * E-mail: (AS); (SMR)
| | - S. Mostafa Razavi
- Department of Chemical, Biomolecular and Corrosion Engineering, The University of Akron, Akron, Ohio, United States of America
| | - Fatemeh Salarian
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Cellular Biotechnology, Cell Science Research Center, Royan Institute for Biotechnology, ACECR, Isfahan, Iran
| | - Azade Rasouli
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Jalil Azami
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Faculty of Veterinary Medicine, Urmia University, Urmia, Iran
| | - Melika Ghasemi Shiran
- Salari Institute of Cognitive and Behavioral Disorders (SICBD), Karaj, Alborz, Iran
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Biology, Faculty of Sciences, Central Tehran Branch, Islamic Azad University, Tehran, Iran
| | - Zahra Kardan
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Cellular Molecular Biology, Faculty of Life Science and Biotechnology, Shahid Beheshti University, Tehran, Iran
| | - Negar Farrokhzad
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Arsham Mikaeili Namini
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Animal Biology, Faculty of Biological Sciences, Kharazmi University, Tehran, Iran
| | - Ali Salari
- Salari Institute of Cognitive and Behavioral Disorders (SICBD), Karaj, Alborz, Iran
- Systems Biology Research Lab, Bioinformatics Group, Systems Biology of the Next Generation Company (SBNGC), Qom, Iran
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran
- * E-mail: (AS); (SMR)
| |
Collapse
|
5
|
Llewelyn MB, Azami J, Roberts MH. Effects of 5-hydroxytryptamine applied into nucleus raphe magnus on nociceptive thresholds and neuronal firing rate. Brain Res 2013; 258:59-68. [PMID: 24010164 DOI: 10.1016/0006-8993(83)91226-x] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
The effect of iontophoretically applied 5-hydroxytryptamine on neurones in nucleus raphe magnus, and the effect of microinjection of 5-hydroxytryptamine into nucleus raphe magnus on nociceptive thresholds were examined in the rat. Iontophoretically applied 5-hydroxytryptamine excited 66% and inhibited 6% of the neurones encountered in the nucleus raphe magnus. The excitatory response to 5-hydroxytryptamine was reduced by the putative serotonergic antagonist cinanserin in 21 of 24 cases. In 12 of these neurones the responses to iontophoretically applied glutamate were also examined. In 11 of the 12 studies the responses to glutamate were reduced by cinanserin. Microinjection of 5 microg of 5-hydroxytryptamine into the nucleus raphe magnus produced analgesia as assessed by the tail-flick response to noxious heat stimulation, but no analgesia as assessed by the paw withdrawal response to pressure. Microinjection of 5 microg of 5-hydroxytryptamine into the adjacent nucleus reticularis paragigantocellularis had no analgesic effect in either test. These results indicate that 5-hydroxytryptamine mainly excites neurones in nucleus raphe magnus and that 5-hydroxytryptamine has an action on neurones in nucleus raphe magnus which modulate the nociceptive threshold.
Collapse
Affiliation(s)
- M B Llewelyn
- Department of Physiology, University College, Cardiff CF1 JXL, UK
| | | | | |
Collapse
|
6
|
Azami J, Green DL, Roberts MHT, Monhemius R. The behavioral importance of dynamically activated descending inhibition from the nucleus reticularis gigantocellularis pars alpha. (University Hospital of Wales, Cardiff, United Kingdom) Pain 2001;92:53-62. Pain Pract 2001. [DOI: 10.1046/j.1533-2500.2001.1039_15.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
7
|
Monhemius R, Azami J, Green DL, Roberts MH. CB1 receptor mediated analgesia from the Nucleus Reticularis Gigantocellularis pars alpha is activated in an animal model of neuropathic pain. Brain Res 2001; 908:67-74. [PMID: 11457432 DOI: 10.1016/s0006-8993(01)02605-1] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Cannabinoids are known to suppress responses to noxious stimulation in animals and man. Recent research has suggested a role for endogenous cannabinoids in the descending inhibition of dorsal horn cells via a supraspinal site of action. We have recently demonstrated [J. Physiol. 506(2) (1998) 459] that the nucleus reticularis gigantocellularis pars alpha (GiA) is a major source of such descending modulation, and importantly, that this system is activated in response to noxious stimulation. We have therefore investigated the role of CB1 receptor activation in mediating the antinociceptive effects of activation of GiA in models of acute and chronic pain. Microinjections (0.5 microl 60% DMSO) of either WIN 55,212-2 (5 microg, selective CB1 agonist), SR141716A (50 microg, competitive CB1 antagonist), both compounds together, or vehicle alone into GiA were performed prior to these tests in a randomised, blind manner. In control animals, WIN 55,212-2 markedly increased withdrawal latencies in the tail flick test and reduced responses to subcutaneous formalin. These effects were blocked by co-administration of SR141716A. These data suggest that activation of cannabinoid CB1 receptor subtypes in GiA leads to behavioural analgesia. In animals with partial sciatic nerve ligation, microinjection of drugs and injection of formalin were performed contralaterally to the site of ligation. Partial sciatic nerve ligation significantly reduced behavioural responses to contralaterally applied formalin. Microinjection of SR141716A to GiA reversed this inhibition of responses to formalin in animals with partial sciatic nerve ligation. These data provide evidence that endogenous CB1 receptor ligands are involved in GiA mediated antinociception, and that this system is important for the modulation of nociceptive transmission in an animal model of chronic neuropathic pain.
Collapse
Affiliation(s)
- R Monhemius
- Physiology Unit, Cardiff School of Bioscience, University of Wales, CF1 3US, Cardiff, UK.
| | | | | | | |
Collapse
|
8
|
Azami J, Green DL, Roberts MH, Monhemius R. The behavioural importance of dynamically activated descending inhibition from the nucleus reticularis gigantocellularis pars alpha. Pain 2001; 92:53-62. [PMID: 11323126 DOI: 10.1016/s0304-3959(00)00471-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
We have recently demonstrated (J Physiol 506 (1998) 459) that the dynamic activation of descending inhibition of the nociceptive response of spinal multireceptive cells occurs in the nucleus reticularis gigantocellularis pars alpha (GiA). In the same paper we have shown that Lamina I dorsal horn cells are responsible for activating this inhibition via a pathway which runs in the contralateral dorsolateral funiculus. The effects of dynamically activating this system by noxious stimulation on behavioural responses to noxious stimuli have not been established. Here we demonstrate the effects of GiA on the behavioural response during application of standardized noxious stimuli. As this system is activated in response to noxious stimulation (J Physiol 506 (1998) 459), it is possible that chronic pain states may also activate GiA. We have therefore investigated this possibility in animals following partial sciatic nerve ligation (an animal model of chronic pain; Pain 43 (1990) 205). Male Wistar rats (280-310 g) were anaesthetized with halothane (0.5-2% in O(2)). Guide cannulae for microinjections were stereotaxically placed above GiA. In one group of animals the sciatic nerve was partially ligated. Animals were allowed to recover for 4-6 days. The responses of each animal during the formalin test (Pain 4 (1977) 161) and the tail flick test (Pain 12 (1982) 229) were recorded on different days. Microinjections (0.5 microl) of either gamma-aminobutyric acid (GABA, 200 mM), D-L homocysteic acid (DLH, 25 mM) or 0.9% saline (as control) into GiA were performed during these tests in a randomized, blind manner. In animals without sciatic nerve ligation, microinjection of GABA to GiA did not significantly affect the animal's response during the tail flick test. However microinjection of DLH significantly increased the latency of tail flick from 6.2 +/- 0.8 to 8.4 +/- 0.5 s for up to 15 min (n = 7, P < 0.01, Mann-Whitney U-test). Microinjection of GABA to GiA increased the behavioural response to formalin between 10 and 20 min post-injection, while microinjection of DLH reduced this response at all time points except 10 min post-injection (n = 8, P < 0.05, Mann-Whitney U-test). In animals with sciatic nerve ligation, microinjections (0.5 microl) of either GABA (200 mM), or saline (as control) into GiA contralateral to the partial sciatic ligation were performed during these tests in a randomized, blind manner. Partial sciatic ligation significantly reduced the behavioural response to contralaterally applied formalin from 15 min post-injection onwards, compared to controls without sciatic nerve ligation. Microinjection of GABA to GiA significantly increased the behavioural response to formalin from 20 to 50 min post-injection. The inactivation of GiA only causes behavioural effects in nociceptive tests of a long enough duration to activate the system (i.e. the formalin test but not the tail flick test). Chemical activation of the system affects both tests. These data strongly support the concept of an important analgesic system which is activated in response to noxious stimulation, and subsequently acts to reduce behavioural responses to noxious stimuli.
Collapse
Affiliation(s)
- J Azami
- Department of Anaesthetics, University Hospital of Wales, CF4 4XN, Cardiff, UK
| | | | | | | |
Collapse
|
9
|
Monhemius R, Green DL, Roberts MH, Azami J. Periaqueductal grey mediated inhibition of responses to noxious stimulation is dynamically activated in a rat model of neuropathic pain. Neurosci Lett 2001; 298:70-4. [PMID: 11154838 DOI: 10.1016/s0304-3940(00)01627-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The periaqueductal grey (PAG) has been shown to be a major source of descending inhibition of dorsal horn cells (Textbook of Pain (1999) 309). However, few studies have demonstrated alterations in behavioural responses to noxious stimulation following inactivation of this nucleus. Many behavioural studies have looked for effects on nociceptive withdrawal thresholds in acute nociceptive tests. These tests would not reveal the presence of inhibition which is activated in response to noxious input. We have therefore investigated this possibility by studying behavioural responses to subcutaneous formalin injection in control animals, and in animals following partial sciatic nerve ligation (an animal model of neuropathic pain (Pain 43(2) (1990) 205). In control animals, microinjection of gamma-aminobutyric acid (GABA) to PAG did not significantly alter behavioural responses to formalin, while microinjection of D,L-homocysteic acid (DLH) reduced these responses. Responses to contralaterally applied formalin were significantly reduced in animals with partial sciatic ligation. Microinjection of GABA to PAG significantly increased these behavioural responses to formalin. We conclude that a component of PAG mediated inhibition of nociception is inactive under normal conditions. This inhibition may be activated by persistent nociceptive input, and possibly reflects long term changes in nociceptive circuitry which occur in neuropathic pain states.
Collapse
Affiliation(s)
- R Monhemius
- Physiology Unit, Cardiff School of Bioscience, University of Wales, CF1 3US, Cardiff, UK.
| | | | | | | |
Collapse
|
10
|
Llewelyn MB, Azami J, Roberts MH. Brainstem mechanisms of antinociception. Effects of electrical stimulation and injection of morphine into the nucleus raphe magnus. Neuropharmacology 1986; 25:727-35. [PMID: 3489199 DOI: 10.1016/0028-3908(86)90088-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The microinjection of morphine into the nucleus raphe magnus (NRM) increased the tail-flick latency of rats but also increased the size of noxiously-evoked responses of dorsal horn neurones. Electrical stimulation of the raphe magnus reduced the response size of the same neurons to noxious stimulation. To control for the possibility that morphine had a membrane stabilising action upon cells in the raphe magnus, tetracaine was injected into the raphe magnus and found to reduce the size of noxiously-evoked responses of dorsal horn cells. Bilateral lesions of the dorsolateral funiculus reduced the effect on tail-flick latency of morphine injected into the raphe magnus, indicating that morphine was causing antinociception by an effect on descending systems. This effect of morphine was fundamentally different however from the effects of electrical stimulation. Antinociception may result from different mechanisms within the raphe magnus nucleus, affected by morphine and electrical stimulation.
Collapse
|
11
|
Azami J, Fozard JR, Round AA, Wallis DI. The depolarizing action of 5-hydroxytryptamine on rabbit vagal primary afferent and sympathetic neurones and its selective blockade by MDL 72222. Naunyn Schmiedebergs Arch Pharmacol 1985; 328:423-9. [PMID: 3990828 DOI: 10.1007/bf00692911] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
MDL 72222 (1 alpha H,3 alpha,5 alpha H-tropan-3-yl-3,5-dichlorobenzoate) is a novel compound with potent and selective blocking actions at certain excitatory 5-hydroxytryptamine (5-HT) receptors on mammalian peripheral neurones. In the present study, the sucrose-gap technique has been used to record depolarizing responses to 5-HT from the cells of the rabbit nodose and superior cervical ganglia and to investigate the potency and selectivity of MDL 72222 as an antagonist of these responses. On nodose ganglia, responses to 5-HT were inhibited surmountably by MDL 72222 at concentrations up to 100 nmol/l. The threshold for antagonism was 2-10 nmol/l and the apparent pA2 value (Schild 1947) was 7.7 +/- 0.2, n = 10. Blockade was selective since responses to GABA and noradrenaline were unaffected by MDL 72222, 100 nmol/l. With concentrations of MDL 72222 higher than 100 nmol/l, antagonism was concentration-related but not in a manner consistent with simple competitive antagonism and even a concentration of 1 mumol/l failed to abolish the response to 5-HT. The results from the superior cervical ganglion were essentially similar to those obtained from the nodose ganglion. The threshold concentration of MDL 72222 for inhibition of 5-HT was 1-10 nmol/l and blockade was selective in that depolarizing responses to dimethylphenyl-piperazinium (DMPP) was unaffected by a concentration of MDL 72222 of 1 mumol/l. The data provide direct evidence that MDL 72222 is a potent and selective antagonist of the receptors for 5-HT which mediate depolarizing responses in vagal primary afferent cell bodies and in sympathetic ganglion cells.
Collapse
|
12
|
Llewelyn MB, Azami J, Roberts MH. The effect of modification of 5-hydroxytryptamine function in nucleus raphe magnus on nociceptive threshold. Brain Res 1984; 306:165-70. [PMID: 6235891 DOI: 10.1016/0006-8993(84)90365-2] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Thresholds to noxious heat stimulation were increased following microinjection of zimelidine, an inhibitor of 5-hydroxytryptamine (5-HT) re-uptake, into the nucleus raphe magnus (NRM) of rats. Pretreatment with intraperitoneally given cinanserin reduced this effect but pretreatment with intraperitoneally given phenoxybenzamine did not. Fenfluramine, which causes the release of 5-HT from synaptic terminals also elevated nociceptive thresholds following microinjection into NRM. Subanalgesic doses of morphine or zimelidine elevated nociceptive thresholds when microinjected together into NRM. The elevation of nociceptive threshold produced by microinjection of morphine into NRM was reduced by simultaneous microinjection of cinanserin into NRM. Cinanserin alone had no effect when microinjected into NRM. These findings suggest that inhibition of the re-uptake of 5-HT in NRM can elevate nociceptive thresholds and that there may be an interaction between the effects of morphine and 5-HT in NRM.
Collapse
|
13
|
Llewelyn HB, Azami J, Roberts MH. Antinociception produced by stimulation of the periaqueductal grey matter: Effects of antagonists microinjected into the nucleus raphe magnus. Pain 1984. [DOI: 10.1016/0304-3959(84)90459-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
14
|
Azami J, Wright DM, Roberts MH. Effects of morphine and naloxone on the responses to noxious stimulation of neurones in the nucleus reticularis paragigantocellularis. Neuropharmacology 1981; 20:869-76. [PMID: 7290359 DOI: 10.1016/0028-3908(81)90080-0] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
15
|
Llewelyn MB, Azami J, Roberts MH. Effects of 5-hydroxytryptamine on nucleus raphe magnus studied by extracellular recording and nociceptive testin. Pain 1981. [DOI: 10.1016/0304-3959(81)90527-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
16
|
Azami J, Roberts MH, Wright DM. Effects of ionophoretic application of morphine and naloxone on responses of nucleus reticularis paragigantocellularis neurones to noxious stimulation in the rat [proceedings]. J Physiol 1979; 293:63P-64P. [PMID: 501643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
|
17
|
Azami J, Davies JE, Roberts MH. Primary afferent depolarization evoked from stimulation of brain stem raphe nuclei in the rat [proceedings]. J Physiol 1979; 293:54P. [PMID: 501632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
|