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Szallasi A. Targeting TRPV1 for Cancer Pain Relief: Can It Work? Cancers (Basel) 2024; 16:648. [PMID: 38339399 PMCID: PMC11154559 DOI: 10.3390/cancers16030648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 01/23/2024] [Accepted: 01/31/2024] [Indexed: 02/12/2024] Open
Abstract
Chronic intractable pain affects a large proportion of cancer patients, especially those with metastatic bone disease. Blocking sensory afferents for cancer pain relief represents an attractive alternative to opioids and other drugs acting in the CNS in that sensory nerve blockers are not addictive and do not affect the mental state of the patient. A distinct subpopulation of sensory afferents expresses the capsaicin receptor TRPV1. Intrathecal resiniferatoxin, an ultrapotent capsaicin analog, ablates TRPV1-expressing nerve endings exposed to the cerebrospinal fluid, resulting in permanent analgesia in women with cervical cancer metastasis to the pelvic bone. High-dose capsaicin patches are effective pain killers in patients with chemotherapy-induced peripheral neuropathic pain. However, large gaps remain in our knowledge since the mechanisms by which cancer activates TRPV1 are essentially unknown. Most important, it is not clear whether or not sensory denervation mediated by TRPV1 agonists affects cancer progression. In a murine model of breast cancer, capsaicin desensitization was reported to accelerate progression. By contrast, desensitization mediated by resiniferatoxin was found to block melanoma growth. These observations imply that TRPV1 blockade for pain relief may be indicated for some cancers and contraindicated for others. In this review, we explore the current state of this field and compare the analgesic potential of TRPV1 antagonism and sensory afferent desensitization in cancer patients.
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Affiliation(s)
- Arpad Szallasi
- Department of Pathology and Experimental Cancer Research, Semmelweis University, 1085 Budapest, Hungary
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de Souza S, Rosario Claudio J, Sim J, Inyang KE, Dagenais A, Monahan K, Lee B, Ramakrishnan H, Parmar V, Geron M, Scherrer G, Folger JK, Laumet G. Interleukin-10 signaling in somatosensory neurons controls CCL2 release and inflammatory response. Brain Behav Immun 2024; 116:193-202. [PMID: 38081433 PMCID: PMC10843623 DOI: 10.1016/j.bbi.2023.12.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 11/29/2023] [Accepted: 12/08/2023] [Indexed: 12/17/2023] Open
Abstract
Appropriate regulation of the inflammatory response is essential for survival. Interleukin-10 (IL-10), a well-known anti-inflammatory cytokine, plays a major role in controlling inflammation. In addition to immune cells, we previously demonstrated that the IL-10 receptor (IL-10R1) is expressed in dorsal root ganglion sensory neurons. There is emerging evidence that these sensory neurons contribute to immunoregulation, and we hypothesized that IL-10 signaling in dorsal root ganglion (DRG) neurons facilitates the regulation of the inflammatory response. We showed that mice that lack IL-10R1 specifically on advillin-positive neurons have exaggerated blood nitric oxide levels, spinal microglia activation, and cytokine upregulation in the spinal cord, liver, and gut compared to wild-type (WT) counterparts in response to systemic lipopolysaccharide (LPS) injection. Lack of IL-10R1 in DRG and trigeminal ganglion (TG) neurons also increased circulating and DRG levels of proinflammatory C-C motif chemokine ligand 2 (CCL2). Interestingly, analysis of published scRNA-seq data revealed that Ccl2 and Il10ra are expressed by similar types of DRG neurons; nonpeptidergic P2X purinoceptor (P2X3R + ) neurons. In primary cultures of DRG neurons, we demonstrated that IL-10R1 inhibits the production of CCL2, but not that of the neuropeptides substance P and calcitonin-gene related peptide (CGRP). Furthermore, our data indicate that ablation of Transient receptor potential vanilloid (TRPV)1 + neurons does not impact the regulation of CCL2 production by IL-10. In conclusion, we showed that IL-10 binds to its receptor on sensory neurons to downregulate CCL2 and contribute to immunoregulation by reducing the attraction of immune cells by DRG neuron-derived CCL2. This is the first evidence that anti-inflammatory cytokines limit inflammation through direct binding to receptors on sensory neurons. Our data also add to the growing literature that sensory neurons have immunomodulatory functions.
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Affiliation(s)
- Sabrina de Souza
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | | | - Jaewon Sim
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | | | - Andrew Dagenais
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Karli Monahan
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Beenhwa Lee
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | | | - Visha Parmar
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Matan Geron
- Department of Cell Biology and Physiology, Department of Pharmacology, UNC Neuroscience Center, University of North Carolina, Chapel Hill, NC, USA
| | - Grégory Scherrer
- Department of Cell Biology and Physiology, Department of Pharmacology, UNC Neuroscience Center, University of North Carolina, Chapel Hill, NC, USA; New York Stem Cell Foundation - Robertson Investigator, University of North Carolina, Chapel Hill, NC, USA
| | - Joseph K Folger
- Department of Physiology, Michigan State University, East Lansing, MI, USA
| | - Geoffroy Laumet
- Department of Physiology, Michigan State University, East Lansing, MI, USA; Department of Physiology, Michigan State University, Interdisciplinary Science and Technology Building, 766 Service Rd, East Lansing, MI 48826, USA.
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Waarala ZM, Comins L, Laumet S, Folger JK, Laumet G. Massage-like stroking produces analgesia in mice. NEUROBIOLOGY OF PAIN (CAMBRIDGE, MASS.) 2024; 15:100149. [PMID: 38226332 PMCID: PMC10788302 DOI: 10.1016/j.ynpai.2023.100149] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 12/22/2023] [Accepted: 12/22/2023] [Indexed: 01/17/2024]
Abstract
Chronic pain treatment remains a major challenge and pharmacological interventions are associated with important side effects. Manual medicine treatments such as massage, acupuncture, manipulation of the fascial system (MFS), and osteopathic manipulative treatments produce pain relief in humans, but the underlying mechanism is poorly understood limiting leverage and optimization of manual medicine techniques as safe pain therapy. To decipher the physiological mechanisms of manipulative medicine treatments, we have established a preclinical model. Here, we established a murine model of massage-like stroking (MLS)-induced analgesia. We characterized that the analgesia effects were present in both sexes, and were independent of the experimenters, handling, consciousness, and opioid receptors. MLS alleviates thermal pain in naive mice and postoperative pain hypersensitivity. This novel model will allow discovery of the physiological mechanisms involved in MLS-induced analgesia and identification of new therapeutic strategies.
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Affiliation(s)
- Zachary M.S. Waarala
- Department of Physiology, Michigan State University, East Lansing, MI 48824, USA
- College of Osteopathic Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Logan Comins
- Department of Physiology, Michigan State University, East Lansing, MI 48824, USA
- College of Osteopathic Medicine, Michigan State University, East Lansing, MI 48824, USA
| | - Sophie Laumet
- Department of Physiology, Michigan State University, East Lansing, MI 48824, USA
| | - Joseph K. Folger
- Department of Physiology, Michigan State University, East Lansing, MI 48824, USA
| | - Geoffroy Laumet
- Department of Physiology, Michigan State University, East Lansing, MI 48824, USA
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Sim J, O'Guin E, Monahan K, Sugimoto C, McLean SA, Albertorio-Sáez L, Zhao Y, Laumet S, Dagenais A, Bernard MP, Folger JK, Robison AJ, Linnstaedt SD, Laumet G. Interleukin-10-producing monocytes contribute to sex differences in pain resolution in mice and humans. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.03.565129. [PMID: 37961295 PMCID: PMC10635095 DOI: 10.1101/2023.11.03.565129] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2023]
Abstract
Pain is closely associated with the immune system, which exhibits sexual dimorphism. For these reasons, neuro-immune interactions are suggested to drive sex differences in pain pathophysiology. However, our understanding of peripheral neuro-immune interactions on sex differences in pain resolution remains limited. Here, we have shown, in both a mouse model of inflammatory pain and in humans following traumatic pain, that males had higher levels of interleukin (IL)-10 than females, which were correlated with faster pain resolution. Following injury, we identified monocytes (CD11b+ Ly6C+ Ly6G-F4/80 mid ) as the primary source of IL-10, with IL-10-producing monocytes being more abundant in males than females. In a mouse model, neutralizing IL-10 signaling through antibodies, genetically ablating IL-10R1 in sensory neurons, or depleting monocytes with clodronate all impaired the resolution of pain hypersensitivity in both sexes. Furthermore, manipulating androgen levels in mice reversed the sexual dimorphism of pain resolution and the levels of IL-10-producing monocytes. These results highlight a novel role for androgen-driven peripheral IL-10-producing monocytes in the sexual dimorphism of pain resolution. These findings add to the growing concept that immune cells play a critical role in resolving pain and preventing the transition into chronic pain. Graphical abstract
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