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De Icco R, Greco R, Demartini C, Vergobbi P, Zanaboni A, Tumelero E, Reggiani A, Realini N, Sances G, Grillo V, Allena M, Tassorelli C. Spinal nociceptive sensitization and plasma palmitoylethanolamide levels during experimentally induced migraine attacks. Pain 2021; 162:2376-2385. [PMID: 33587406 PMCID: PMC8374714 DOI: 10.1097/j.pain.0000000000002223] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [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: 09/30/2020] [Revised: 01/04/2021] [Accepted: 01/22/2021] [Indexed: 11/26/2022]
Abstract
ABSTRACT Migraine pathophysiology has been suggested to include dysregulation of the endocannabinoid system (ES). We simultaneously evaluated plasma anandamide (AEA) and palmitoylethanolamide (PEA) levels and spinal sensitization in a validated human model of migraine based on systemic nitroglycerin (NTG) administration. Twenty-four subjects with episodic migraine (MIG) and 19 healthy controls (HC) underwent blood sampling and investigation of nociceptive withdrawal reflex thresholds (RTh: single-stimulus threshold; TST: temporal summation threshold) before and 30 (T30), 60 (T60), and 120 (T120) minutes after sublingual NTG administration (0.9 mg). At baseline, the MIG and HC groups were comparable for plasma AEA (P = 0.822) and PEA (P = 0.182) levels, and for RTh (P = 0.142) and TST values (P = 0.150). Anandamide levels increased after NTG administration (P = 0.022) in both groups, without differences between them (P = 0.779). By contrast, after NTG administration, PEA levels increased in the MIG group at T120 (P = 0.004), while remaining stable in the HC group. Nitroglycerin administration induced central sensitization in the MIG group, which was recorded as reductions in RTh (P = 0.046) at T30 and T120, and in TST (P = 0.001) at all time points. In the HC group, we observed increases in RTh (P = 0.001) and TST (P = 0.008), which suggest the occurrence of habituation. We found no significant correlations between the ES and neurophysiological parameters. Our findings suggest a role for PEA in the ictal phase of episodic migraine. The ES does not seem to be directly involved in the modulation of NTG-induced central sensitization, which suggests that the observed PEA increase and spinal sensitization are parallel, probably unrelated, phenomena.
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Affiliation(s)
- Roberto De Icco
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Rosaria Greco
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Chiara Demartini
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Pietro Vergobbi
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Annamaria Zanaboni
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
| | - Elena Tumelero
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Angelo Reggiani
- Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genova, Italy
| | - Natalia Realini
- Department of Drug Discovery and Development, Istituto Italiano di Tecnologia, Genova, Italy
| | - Grazia Sances
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Valentina Grillo
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Marta Allena
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Cristina Tassorelli
- Headache Science and Neurorehabilitation Center, IRCCS Mondino Foundation, Pavia, Italy
- Department of Brain and Behavioral Sciences, University of Pavia, Pavia, Italy
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Wang N, Zhang YH, Wang JY, Luo F. Current Understanding of the Involvement of the Insular Cortex in Neuropathic Pain: A Narrative Review. Int J Mol Sci 2021; 22:2648. [PMID: 33808020 DOI: 10.3390/ijms22052648] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 03/03/2021] [Accepted: 03/04/2021] [Indexed: 12/22/2022] Open
Abstract
Neuropathic pain is difficult to cure and is often accompanied by emotional and psychological changes. Exploring the mechanisms underlying neuropathic pain will help to identify a better treatment for this condition. The insular cortex is an important information integration center. Numerous imaging studies have documented increased activity of the insular cortex in the presence of neuropathic pain; however, the specific role of this region remains controversial. Early studies suggested that the insular lobe is mainly involved in the processing of the emotional motivation dimension of pain. However, increasing evidence suggests that the role of the insular cortex is more complex and may even be related to the neural plasticity, cognitive evaluation, and psychosocial aspects of neuropathic pain. These effects contribute not only to the development of neuropathic pain, but also to its comorbidity with neuropsychiatric diseases. In this review, we summarize the changes that occur in the insular cortex in the presence of neuropathic pain and analgesia, as well as the molecular mechanisms that may underlie these conditions. We also discuss potential sex-based differences in these processes. Further exploration of the involvement of the insular lobe will contribute to the development of new pharmacotherapy and psychotherapy treatments for neuropathic pain.
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Bagheri Tudashki H, Haddad Y, Charfi I, Couture R, Pineyro G. Ligand-specific recycling profiles determine distinct potential for chronic analgesic tolerance of delta-opioid receptor (DOPr) agonists. J Cell Mol Med 2020; 24:5718-5730. [PMID: 32279433 PMCID: PMC7214178 DOI: 10.1111/jcmm.15234] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2020] [Revised: 03/11/2020] [Accepted: 03/12/2020] [Indexed: 12/25/2022] Open
Abstract
δ-opioid receptor (DOPr) agonists have analgesic efficacy in chronic pain models but development of tolerance limits their use for long-term pain management. Although agonist potential for inducing acute analgesic tolerance has been associated with distinct patterns of DOPr internalization, the association between trafficking and chronic tolerance remains ill-defined. In a rat model of streptozotocin (STZ)-induced diabetic neuropathy, deltorphin II and TIPP produced sustained analgesia following daily (intrathecal) i.t. injections over six days, whereas similar treatment with SNC-80 or SB235863 led to progressive tolerance and loss of the analgesic response. Trafficking assays in murine neuron cultures showed no association between the magnitude of ligand-induced sequestration and development of chronic tolerance. Instead, ligands that supported DOPr recycling were also the ones producing sustained analgesia over 6-day treatment. Moreover, endosomal endothelin-converting enzyme 2 (ECE2) blocker 663444 prevented DOPr recycling by deltorphin II and TIPP and precipitated tolerance by these ligands. In conclusion, agonists, which support DOPr recycling, avoid development of analgesic tolerance over repeated administration.
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Affiliation(s)
| | - Youssef Haddad
- Department of Pharmacology and PhysiologyFaculty of MedicineUniversité de MontréalMontréalQCCanada
| | - Iness Charfi
- Centre de RechercheCentre Hospitalier Universitaire Ste-JustineMontréalQCCanada
- Department of Pharmacology and PhysiologyFaculty of MedicineUniversité de MontréalMontréalQCCanada
| | - Rejean Couture
- Department of Pharmacology and PhysiologyFaculty of MedicineUniversité de MontréalMontréalQCCanada
| | - Graciela Pineyro
- Centre de RechercheCentre Hospitalier Universitaire Ste-JustineMontréalQCCanada
- Department of Pharmacology and PhysiologyFaculty of MedicineUniversité de MontréalMontréalQCCanada
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Corli O, Porcu L, Santucci C, Bosetti C. The Complex Balance between Analgesic Efficacy, Change of Dose and Safety Profile Over Time, in Cancer Patients Treated with Opioids: Providing the Clinicians with an Evaluation Tool. J Clin Med 2020; 9:jcm9020502. [PMID: 32059572 PMCID: PMC7073698 DOI: 10.3390/jcm9020502] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2020] [Revised: 01/21/2020] [Accepted: 02/10/2020] [Indexed: 01/29/2023] Open
Abstract
Background: Scanty data exist on the integration between the analgesic effect of opioids, dose changes, and adverse events in cancer patients. Methods: To provide further information on this issue, we analysed data on 498 advanced-stage cancer patients treated with strong opioids. At baseline and three visits (at days 7, 14, and 21), pain intensity, oral morphine-equivalent daily dose, and the prevalence of major adverse events were measured. The proportion of responders (pain intensity decrease ≥30% from baseline) and non-responders, as well as of patients with low or high dose escalation, was calculated. Results: Pain intensity strongly decreased from baseline (pain intensity difference −4.0 at day 7 and −4.2 at day 21) in responders, while it was quite stable in non-responders (pain intensity difference −0.8 at day 7 and −0.9 at day 21). In low dose escalation patients (82.4% at final visit), daily dose changed from 52.3 to 65.3 mg; in high dose escalation patients (17.6%), it varied from 94.1 to 146.7 mg. Among responders, high dose escalation patients experienced significantly more frequent adverse events compared to low or high dose escalation patients, while no differences were observed in non-responders. Conclusions: The response to opioids results from the combination of three clinical aspects, which are strongly interrelated. These results provide some thoughts to help clinical evaluations and therapeutic decisions regarding opioid use.
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Affiliation(s)
- Oscar Corli
- Department of Oncology, Laboratory of Methodology for Clinical Research, Unit of Pain and Palliative Care Research, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milan, Italy
- Correspondence: ; Tel.: +39-0239014-654
| | - Luca Porcu
- Department of Oncology, Laboratory of Methodology for Clinical Research, Unit of Methodological Research, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milan, Italy;
| | - Claudia Santucci
- Department of Oncology, Laboratory of Methodology for Clinical Research, Unit of Cancer Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milan, Italy; (C.S.); (C.B.)
| | - Cristina Bosetti
- Department of Oncology, Laboratory of Methodology for Clinical Research, Unit of Cancer Epidemiology, Istituto di Ricerche Farmacologiche Mario Negri IRCCS, 20156 Milan, Italy; (C.S.); (C.B.)
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Abstract
In view of the broad range of effects attributed to melatonin, this study evaluated its analgesic effect on inflammatory pain induced by complete Freund’s adjuvant (CFA) in Wistar rats. Inflammation was induced by intradermal CFA injection in the hind paw of all animals, which were then divided into two groups that received either 60 mg/kg of melatonin or vehicle (1% alcohol in saline), intraperitoneally, for three days. The analgesic effect of melatonin was assessed by the hot-plate test, immediately and thereafter at 30, 60, 90, and 120 minutes after the first administration and 24 hours after once-daily administration for 2 more days. After CFA injection, melatonin administration increased withdrawal latency at 60 minutes after the first dose. After the end of treatment, melatonin showed a significant analgesic effect on inflammatory pain. This study paves the way for exploration of how brief courses of treatment could improve this analgesic effect in the late phases of inflammatory pain.
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Affiliation(s)
- Gabriela Laste
- Laboratório de Farmacologia da Dor, Departamento de Farmacologia, Instituto de Ciências Básicas da Saúde
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