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Chahl LA. TRPV1 Channels in the Central Nervous System as Drug Targets. Pharmaceuticals (Basel) 2024; 17:756. [PMID: 38931423 PMCID: PMC11206835 DOI: 10.3390/ph17060756] [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: 03/30/2024] [Revised: 05/14/2024] [Accepted: 06/05/2024] [Indexed: 06/28/2024] Open
Abstract
TRPV1 channels are polymodal cation channels located predominantly on primary afferent neurons that are activated by inflammatory mediators, capsaicin (the active component in chili peppers), and noxious heat. TRPV1 channel antagonists are potential new analgesic agents, but their development has been hindered by the finding that they also produce loss of thermal homeostasis and response to noxious heat. Results from recent studies of the TRPV1 channel indicate that it might be possible to develop TRPV1 channel antagonists that inhibit pain without affecting noxious heat sensation. TRPV1 channels are also present in the central nervous system (CNS) and have been implicated in learning, memory, and behaviour. TRPV1 channel modulators have been proposed to have possible therapeutic potential in the treatment of neurological and psychiatric conditions. However, further understanding of the role of TRPV1 channels in the CNS is required before therapeutic advances in the treatment of neuropsychiatric conditions with TRPV1 channel modulators can be made.
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Affiliation(s)
- Loris A Chahl
- School of Biomedical Sciences and Pharmacy, University of Newcastle, Callaghan, NSW 2308, Australia
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2
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Nehr-Majoros AK, Király Á, Helyes Z, Szőke É. Lipid raft disruption as an opportunity for peripheral analgesia. Curr Opin Pharmacol 2024; 75:102432. [PMID: 38290404 DOI: 10.1016/j.coph.2024.102432] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Revised: 12/17/2023] [Accepted: 01/02/2024] [Indexed: 02/01/2024]
Abstract
Chronic pain conditions are unmet medical needs, since the available drugs, opioids, non-steroidal anti-inflammatory/analgesic drugs and adjuvant analgesics do not provide satisfactory therapeutic effect in a great proportion of patients. Therefore, there is an urgent need to find novel targets and novel therapeutic approaches that differ from classical pharmacological receptor antagonism. Most ion channels and receptors involved in pain sensation and processing such as Transient Receptor Potential ion channels, opioid receptors, P2X purinoreceptors and neurokinin 1 receptor are located in the lipid raft regions of the plasma membrane. Targeting the membrane lipid composition and structure by sphingolipid or cholesterol depletion might open future perspectives for the therapy of chronic inflammatory, neuropathic or cancer pain, most importantly acting at the periphery.
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Affiliation(s)
- Andrea Kinga Nehr-Majoros
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Ágnes Király
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School & Centre for Neuroscience, University of Pécs, 12 Szigeti Street, H-7624, Pécs, Hungary; National Laboratory for Drug Research and Development, Budapest, Hungary; Hungarian Research Network, Chronic Pain Research Group, Pécs, Hungary.
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3
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Anand U, Anand P, Sodergren MH. Terpenes in Cannabis sativa Inhibit Capsaicin Responses in Rat DRG Neurons via Na +/K + ATPase Activation. Int J Mol Sci 2023; 24:16340. [PMID: 38003528 PMCID: PMC10671062 DOI: 10.3390/ijms242216340] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/08/2023] [Accepted: 11/10/2023] [Indexed: 11/26/2023] Open
Abstract
Terpenes in Cannabis sativa exert analgesic effects, but the mechanisms are uncertain. We examined the effects of 10 terpenes on capsaicin responses in an established model of neuronal hypersensitivity. Adult rat DRG neurons cultured with neurotrophic factors NGF and GDNF were loaded with Fura2AM for calcium imaging, and treated with individual terpenes or vehicle for 5 min, followed by 1 µMol capsaicin. In vehicle treated control experiments, capsaicin elicited immediate and sustained calcium influx. Most neurons treated with terpenes responded to capsaicin after 6-8 min. Few neurons showed immediate capsaicin responses that were transient or normal. The delayed responses were found to be due to calcium released from the endoplasmic reticulum, as they were maintained in calcium/magnesium free media, but not after thapsigargin pre-treatment. Terpene inhibition of calcium influx was reversed after washout of medium, in the absence of terpenes, and in the presence of the Na+/K+ ATPase inhibitor ouabain, but not CB1 or CB2 receptor antagonists. Thus, terpenes inhibit capsaicin evoked calcium influx by Na+/K+ ATPase activation. Immunofluorescence showed TRPV1 co-expression with α1β1 Na+/K+ ATPase in most neurons while others were either TRPV1 or α1β1 Na+/K+ ATPase positive.
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Affiliation(s)
- Uma Anand
- Faculty of Medicine, Imperial College London, Hammersmith Hospital, Du Cane Rd, London W12 ONN, UK; (P.A.); (M.H.S.)
| | - Praveen Anand
- Faculty of Medicine, Imperial College London, Hammersmith Hospital, Du Cane Rd, London W12 ONN, UK; (P.A.); (M.H.S.)
| | - Mikael Hans Sodergren
- Faculty of Medicine, Imperial College London, Hammersmith Hospital, Du Cane Rd, London W12 ONN, UK; (P.A.); (M.H.S.)
- Curaleaf International Ltd., 179 Great Portland Street, London W1W 5PL, UK
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4
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Ma J, Nguyen D, Madas J, Bizanti A, Mistareehi A, Kwiat AM, Chen J, Lin M, Christie R, Hunter P, Heal M, Baldwin S, Tappan S, Furness JB, Powley TL, Cheng Z(J. Organization and morphology of calcitonin gene-related peptide-immunoreactive axons in the whole mouse stomach. J Comp Neurol 2023; 531:1608-1632. [PMID: 37694767 PMCID: PMC10593087 DOI: 10.1002/cne.25519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2022] [Revised: 05/19/2023] [Accepted: 05/29/2023] [Indexed: 09/12/2023]
Abstract
Nociceptive afferent axons innervate the stomach and send signals to the brain and spinal cord. Peripheral nociceptive afferents can be detected with a variety of markers (e.g., substance P [SP] and calcitonin gene-related peptide [CGRP]). We recently examined the topographical organization and morphology of SP-immunoreactive (SP-IR) axons in the whole mouse stomach muscular layer. However, the distribution and morphological structure of CGRP-IR axons remain unclear. We used immunohistochemistry labeling and applied a combination of imaging techniques, including confocal and Zeiss Imager M2 microscopy, Neurolucida 360 tracing, and integration of axon tracing data into a 3D stomach scaffold to characterize CGRP-IR axons and terminals in the whole mouse stomach muscular layers. We found that: (1) CGRP-IR axons formed extensive terminal networks in both ventral and dorsal stomachs. (2) CGRP-IR axons densely innervated the blood vessels. (3) CGRP-IR axons ran in parallel with the longitudinal and circular muscles. Some axons ran at angles through the muscular layers. (4) They also formed varicose terminal contacts with individual myenteric ganglion neurons. (5) CGRP-IR occurred in DiI-labeled gastric-projecting neurons in the dorsal root and vagal nodose ganglia, indicating CGRP-IR axons were visceral afferent axons. (6) CGRP-IR axons did not colocalize with tyrosine hydroxylase or vesicular acetylcholine transporter axons in the stomach, indicating CGRP-IR axons were not visceral efferent axons. (7) CGRP-IR axons were traced and integrated into a 3D stomach scaffold. For the first time, we provided a topographical distribution map of CGRP-IR axon innervation of the whole stomach muscular layers at the cellular/axonal/varicosity scale.
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Affiliation(s)
- Jichao Ma
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Duyen Nguyen
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Jazune Madas
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Ariege Bizanti
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Anas Mistareehi
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Andrew M. Kwiat
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Jin Chen
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
| | - Mabelle Lin
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Richard Christie
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Peter Hunter
- Auckland Bioengineering Institute, University of Auckland, Auckland, New Zealand
| | - Maci Heal
- MBF Bioscience, Williston, Vermont, USA
| | | | | | - John B. Furness
- Department of Anatomy & Physiology, Florey Institute of Neuroscience and Mental Health, University of Melbourne, Parkville, Victoria, Australia
| | - Terry L. Powley
- Department of Psychological Sciences, Purdue University, West Lafayette, Indiana, USA
| | - Zixi (Jack) Cheng
- Burnett School of Biomedical Sciences, College of Medicine, University of Central Florida, Orlando, Florida, USA
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5
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Sütő B, Kolumbán B, Szabó É, Pásztor S, Németh T, Bagoly T, Botz B, Pintér E, Helyes Z. Plasma Somatostatin Levels Increase during Scoliosis Surgery, but Not Herniated Disc Operations: Results of a Pilot Study. Biomedicines 2023; 11:2154. [PMID: 37626651 PMCID: PMC10452449 DOI: 10.3390/biomedicines11082154] [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: 06/20/2023] [Revised: 07/19/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023] Open
Abstract
Somatostatin (SST) released from capsaicin-sensitive sensory nerves in response to stimulation exerts systemic anti-inflammatory, analgesic actions. Its elevation correlates with the extent of tissue injury. We measured plasma SST alterations during spine operations (scoliosis and herniated disc) to determine whether its release might be a general protective mechanism during painful conditions. Sampling timepoints were baseline (1), after: soft tissue retraction (2), osteotomy (3), skin closure (4), the following morning (5). Plasma SST-like immunoreactivity (SST-LI) determined by radioimmunoassay was correlated with pain intensity and the correction angle (Cobb angle). In scoliosis surgery, postoperative pain intensity (VAS 2.) 1 day after surgery significantly increased (from 1.44 SEM ± 0.68 to 6.77 SEM ± 0.82, p = 0.0028) and positively correlated with the Cobb angle (p = 0.0235). The baseline Cobb degree negatively correlated (p = 0.0459) with the preoperative SST-LI. The plasma SST-LI significantly increased in fraction 3 compared to the baseline (p < 0.05), and significantly decreased thereafter (p < 0.001). In contrast, in herniated disc operations no SST-LI changes were observed in either group. The VAS decreased after surgery both in the traditional (mean 6.83 to 2.29, p = 0.0005) and microdiscectomy groups (mean 7.22 to 2.11, p = 0.0009). More extensive and destructive scoliosis surgery might cause greater tissue damage with greater pain (inflammation), which results in a significant SST release into the plasma from the sensory nerves. SST is suggested to be involved in an endogenous postoperative analgesic (anti-inflammatory) mechanism.
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Affiliation(s)
- Balázs Sütő
- Department of Anaesthesia and Intensive Therapy, Medical School, University of Pécs, 7624 Pécs, Hungary;
| | - Bálint Kolumbán
- Department of Neurosurgery, Medical School, University of Pécs, 7623 Pécs, Hungary
| | - Éva Szabó
- Department of Otorhinolaryngology, Medical School, University of Pécs, 7621 Pécs, Hungary
| | - Sára Pásztor
- Department of Internal Medicine, Fejér County Szent György University Teaching Hospital, 8000 Székesfehérvár, Hungary
| | - Timea Németh
- Department of Languages for Biomedical Purposes and Communication, Medical School, University of Pécs, 7624 Pécs, Hungary
| | - Teréz Bagoly
- Department of Pharmacology and Pharmacotherapy & Eötvös Loránd Research Network, Chronic Pain Research Group, Medical School, University of Pécs, 7624 Pécs, Hungary
| | - Bálint Botz
- Department of Pharmacology and Pharmacotherapy & Eötvös Loránd Research Network, Chronic Pain Research Group, Medical School, University of Pécs, 7624 Pécs, Hungary
- Department of Medical Imaging, Medical School, University of Pécs, 7624 Pécs, Hungary
| | - Erika Pintér
- Department of Pharmacology and Pharmacotherapy & Eötvös Loránd Research Network, Chronic Pain Research Group, Medical School, University of Pécs, 7624 Pécs, Hungary
- National Laboratory for Drug Research and Development, 1117 Budapest, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy & Eötvös Loránd Research Network, Chronic Pain Research Group, Medical School, University of Pécs, 7624 Pécs, Hungary
- National Laboratory for Drug Research and Development, 1117 Budapest, Hungary
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6
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Ma J, Nguyen D, Madas J, Bizanti A, Mistareehi A, Kwiat AM, Chen J, Lin M, Christie R, Hunter P, Heal M, Baldwin S, Tappan S, Furness JB, Powley TL, Cheng ZJ. Mapping the Organization and Morphology of Calcitonin Gene-Related Peptide (CGRP)-IR Axons in the Whole Mouse Stomach. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.05.23.541811. [PMID: 37398245 PMCID: PMC10312482 DOI: 10.1101/2023.05.23.541811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Nociceptive afferent axons innervate the stomach and send signals to the brain and spinal cord. Peripheral nociceptive afferents can be detected with a variety of markers [e.g., substance P (SP) and calcitonin gene-related peptide (CGRP)]. We recently examined the topographical organization and morphology of SP-immunoreactive (SP-IR) axons in the whole mouse stomach muscular layer. However, the distribution and morphological structure of CGRP-IR axons remain unclear. We used immunohistochemistry labeling and applied a combination of imaging techniques, including confocal and Zeiss Imager M2 microscopy, Neurolucida 360 tracing, and integration of axon tracing data into a 3D stomach scaffold to characterize CGRP-IR axons and terminals in the whole mouse stomach muscular layers. We found that: 1) CGRP-IR axons formed extensive terminal networks in both ventral and dorsal stomachs. 2) CGRP-IR axons densely innervated the blood vessels. 3) CGRP-IR axons ran in parallel with the longitudinal and circular muscles. Some axons ran at angles through the muscular layers. 4) They also formed varicose terminal contacts with individual myenteric ganglion neurons. 5) CGRP-IR occurred in DiI-labeled gastric-projecting neurons in the dorsal root and vagal nodose ganglia, indicating CGRP-IR axons were visceral afferent axons. 6) CGRP-IR axons did not colocalize with tyrosine hydroxylase (TH) or vesicular acetylcholine transporter (VAChT) axons in the stomach, indicating CGRP-IR axons were not visceral efferent axons. 7) CGRP-IR axons were traced and integrated into a 3D stomach scaffold. For the first time, we provided a topographical distribution map of CGRP-IR axon innervation of the whole stomach muscular layers at the cellular/axonal/varicosity scale.
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7
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Szallasi A. The Vanilloid (Capsaicin) Receptor TRPV1 in Blood Pressure Regulation: A Novel Therapeutic Target in Hypertension? Int J Mol Sci 2023; 24:8769. [PMID: 37240118 PMCID: PMC10217837 DOI: 10.3390/ijms24108769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 05/04/2023] [Accepted: 05/07/2023] [Indexed: 05/28/2023] Open
Abstract
Today's sedentary lifestyle with excess food and little exercise increases the number of people with hypertension, a major risk factor for stroke. New knowledge of treatments in this field is of utmost importance. In animal experiments, the activation by capsaicin of TRPV1-expressing sensory afferents evokes a drop in blood pressure by triggering the Bezold-Jarisch reflex. In hypertensive rats, capsaicin reduces blood pressure. Conversely, genetic ablation of the TRPV1 receptor results in elevated nocturnal (but not diurnal) blood pressure. These observations imply a therapeutic potential for TRPV1 activation in hypertensive patients. Indeed, in a major epidemiological study involving 9273 volunteers, dietary capsaicin was found to lower the risk for hypertension. New research indicates that the mechanism of action of capsaicin on blood pressure regulation is far more complex than previously thought. In addition to the well-recognized role of capsaicin-sensitive afferents in blood pressure regulation, TRPV1 seems to be expressed both in endothelial cells and vascular smooth muscle. This review aims to evaluate the therapeutic potential of TRPV1-targeting drugs in hypertensive 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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8
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Soriano-Correa C, Pérez de la Luz A, Sainz-Díaz CI. Adsorption of Capsaicin into the Nanoconfined Interlayer Space of Montmorillonite by DFT Calculations. J Pharm Sci 2023; 112:798-807. [PMID: 36354079 DOI: 10.1016/j.xphs.2022.10.024] [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: 10/03/2022] [Accepted: 10/22/2022] [Indexed: 11/06/2022]
Abstract
Capsaicin is the main compound responsible of the hot sense of the chili fruits. This compound has interesting therapeutic properties including anticancer, anti-inflammatory effects, and analgesic. However, its use has several secondary effects, such as skin irritation and allergies. Then, new therapeutic strategies are searched in order to overcome these problems. Montmorillonite has proved to be an excellent excipient for the release of pharmaceutical drugs. In this work, the molecular structure and crystal structure of capsaicin, and the adsorption of this molecule into the interlayer space of montmorillonite have been studied using quantum mechanical calculations based on Density Functional Theory (DFT) level of theory and molecular dynamics simulations. The crystal structure has been predicted with these calculations and the intermolecular interactions have been determined with a higher resolution than the previous experimental data. The adsorption of capsaicin into the confined interlayer space of montmorillonite is energetically favourable with low and high octahedral charge. This adsorption can be monitored by IR spectroscopy observing frequency shifts in some bands during the adsorption. This enhances the use of these clay minerals for capsaicin therapeutic formulations.
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Affiliation(s)
- Catalina Soriano-Correa
- Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Av. de las Palmeras, 4, 18100-Armilla, Granada, Spain; Unidad de Química Computacional, Facultad de Estudios Superiores Zaragoza, Universidad Nacional Autónoma de México, Iztapalapa, C.P. 09230 Mexico City, Mexico
| | - Alexander Pérez de la Luz
- Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Av. de las Palmeras, 4, 18100-Armilla, Granada, Spain; Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico City, 09340, Mexico
| | - C Ignacio Sainz-Díaz
- Instituto Andaluz de Ciencias de la Tierra, Consejo Superior de Investigaciones Científicas-Universidad de Granada, Av. de las Palmeras, 4, 18100-Armilla, Granada, Spain.
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Yasin M, Li L, Donovan-Mak M, Chen ZH, Panchal SK. Capsicum Waste as a Sustainable Source of Capsaicinoids for Metabolic Diseases. Foods 2023; 12:foods12040907. [PMID: 36832982 PMCID: PMC9956217 DOI: 10.3390/foods12040907] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 02/15/2023] [Accepted: 02/15/2023] [Indexed: 02/23/2023] Open
Abstract
Capsaicinoids are pungent alkaloid compounds enriched with antioxidants, anti-microbial, anti-inflammatory, analgesics, anti-carcinogenic, anti-obesity and anti-diabetic properties. These compounds are primarily synthesised in the placenta of the fruit and then transported to other vegetative parts. Different varieties of capsicum and chillies contain different capsaicinoid concentrations. As capsicums and chillies are grown extensively throughout the world, their agricultural and horticultural production leads to significant amount of waste generation, in the form of fruits and plant biomass. Fruit wastes (placenta, seeds and unused fruits) and plant biowaste (stems and leaves) can serve as sources of capsaicinoids which can provide opportunities to extract these compounds for development of nutraceutical products using conventional or advanced extraction techniques. Capsaicin and dihydrocapsaicin are two most abundantly found pungent compounds. Considering the health benefits of capsaicinoids, these compounds can help in reducing metabolic disease complications. The development of an advanced encapsulation therapy of safe and clinically effective oral capsaicinoid/capsaicin formulation seem to require evaluation of strategies to address challenges related to the dosage, limited half-life and bioavailability, adverse effects and pungency, and the impacts of other ligands antagonising the major capsaicinoid receptor.
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Boros M, Sóki N, Molnár A, Ábrahám H. Morphological study of the postnatal hippocampal development in the TRPV1 knockout mice. Temperature (Austin) 2023; 10:102-120. [PMID: 37187833 PMCID: PMC10177702 DOI: 10.1080/23328940.2023.2167444] [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: 08/31/2022] [Revised: 11/25/2022] [Accepted: 12/01/2022] [Indexed: 01/15/2023] Open
Abstract
Transient receptor potential vanilloid 1 (TRPV1) is a non-selective cation channel with polymodal sensory function. TRPV1 links to fever, while, according to previous studies on TRPV1 knock-out (KO) mice, the role of the channel in the generation of febrile seizure is debated. In the hippocampal formation, functional TRPV1 channels are expressed by Cajal-Retzius cells, which have a role in guidance of migrating neurons during development. Despite the developmental aspects of febrile seizure as well as of Cajal-Retzius cells, no information is available about the hippocampal development in TRPV1 KO mouse. Therefore, in the present work postnatal development of the hippocampal formation was studied in TRPV1 KO mice. Several morphological characteristics including neuronal positioning and maturation, synaptogenesis and myelination were examined with light microscopy following immunohistochemical detection of protein markers of various neurons, synapses, and myelination. Regarding the cytoarchitectonics, neuronal migration, morphological, and neurochemical maturation, no substantial difference could be detected between TRPV1 KO and wild-type control mice. Our data indicate that synapse formation and myelination occur similarly in TRPV1 KO and in control animals. We have found slightly, but not significantly larger numbers of persisting Cajal-Retzius cells in the KO mice than in controls. Our result strengthens previous suggestion concerning the role of TRPV1 channel in the postnatal apoptotic cell death of Cajal-Retzius cells. However, the fact that the hippocampus of KO mice lacks major developmental abnormalities supports the use of TRPV1 KO in various animal models of diseases and pathological conditions.
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Affiliation(s)
- Melinda Boros
- Department of Medical Biology and Central Electron Microscopic Laboratory, University of Pécs Medical School, Pécs, Hungary
| | - Noémi Sóki
- Department of Medical Biology and Central Electron Microscopic Laboratory, University of Pécs Medical School, Pécs, Hungary
| | - Abigél Molnár
- Department of Medical Biology and Central Electron Microscopic Laboratory, University of Pécs Medical School, Pécs, Hungary
| | - Hajnalka Ábrahám
- Department of Medical Biology and Central Electron Microscopic Laboratory, University of Pécs Medical School, Pécs, Hungary
- Institute for the Psychology of Special Needs, Bárczi Gusztáv Faculty of Special Needs Education, Eötvös Loránd University, Budapest, Hungary
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11
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Szallasi A. Dietary Capsaicin: A Spicy Way to Improve Cardio-Metabolic Health? Biomolecules 2022; 12:biom12121783. [PMID: 36551210 PMCID: PMC9775666 DOI: 10.3390/biom12121783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 11/26/2022] [Accepted: 11/27/2022] [Indexed: 12/03/2022] Open
Abstract
Today's sedentary lifestyle with too much food and too little exercise has made metabolic syndrome a pandemic. Metabolic syndrome is a major risk factor for type-2 diabetes and cardiovascular disease. New knowledge of medical and nutraceutical intervention in the early stages of metabolic syndrome is central to prevent these deadly complications. People who eat chili pepper on a regular basis seem to stay healthier and live longer than those who do not. Animal experiments suggest a therapeutic potential for dietary capsaicin, the active principle in hot chili pepper, to reduce the risk of developing metabolic syndrome. This is an attractive theory since capsaicin has been a culinary staple for thousands of years, and is generally deemed safe when consumed in hedonically acceptable doses. The broad expression of the capsaicin receptor TRPV1 in metabolically active tissues lends experimental support to this theory. This review critically evaluates the available experimental and clinical evidence for and against dietary capsaicin being an effective dietary means to improve cardio-metabolic health. It comes to the conclusion that although a chili pepper-rich diet is associated with a reduced risk of dying due to cardiovascular disease, dietary capsaicin has no clear effect on blood glucose or lipid profiles. Therefore, the reduced mortality risk may reflect the beneficial action of digested capsaicin on gut microbiota.
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Affiliation(s)
- Arpad Szallasi
- Department of Pathology and Experimental Cancer Research, Semmelweis University, 1085 Budapest, Hungary
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12
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Pintér E, Helyes Z, Szőke É, Bölcskei K, Kecskés A, Pethő G. The triple function of the capsaicin-sensitive sensory neurons: In memoriam János Szolcsányi. Temperature (Austin) 2022; 10:13-34. [PMID: 38059854 PMCID: PMC10177685 DOI: 10.1080/23328940.2022.2147388] [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: 08/31/2022] [Revised: 11/08/2022] [Accepted: 11/08/2022] [Indexed: 11/23/2022] Open
Abstract
This paper is dedicated to the memory of János Szolcsányi (1938-2018), an outstanding Hungarian scientist. Among analgesics that act on pain receptors, he identified capsaicin as a selective lead molecule. He studied the application of capsaicin and revealed several physiological (pain, thermoregulation) and pathophysiological (inflammation, gastric ulcer) mechanisms. He discovered a new neuroregulatory system without sensory efferent reflex and investigated its pharmacology. The authors of this review are his former Ph.D. students who carried out their doctoral work in Szolcsányi's laboratory between 1985 and 2010 and report on the scientific results obtained under his guidance. His research group provided evidence for the triple function of the peptidergic capsaicin-sensitive sensory neurons including classical afferent function, local efferent responses, and remote, hormone-like anti-inflammatory, and antinociceptive actions. They also proposed somatostatin receptor type 4 as a promising drug target for the treatment of pain and inflammation. They revealed that neonatal capsaicin treatment caused no acute neuronal death but instead long-lasting selective ultrastructural and functional changes in B-type sensory neurons, similar to adult treatment. They described that lipid raft disruption diminished the agonist-induced channel opening of the TRPV1, TRPA1, and TRPM8 receptors in native sensory neurons. Szolcsányi's group has developed new devices for noxious heat threshold measurement: an increasing temperature hot plate and water bath. This novel approach proved suitable for assessing the thermal antinociceptive effects of analgesics as well as for analyzing peripheral mechanisms of thermonociception.
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Affiliation(s)
- Erika Pintér
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
- National Laboratory for Drug Research and Development, Magyar tudósok krt. 2. H-1117Budapest, Hungary
- Eötvös Lorand Research Network, Chronic Pain Research Group, University of Pécs, H7624, Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
- National Laboratory for Drug Research and Development, Magyar tudósok krt. 2. H-1117Budapest, Hungary
- Eötvös Lorand Research Network, Chronic Pain Research Group, University of Pécs, H7624, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
- National Laboratory for Drug Research and Development, Magyar tudósok krt. 2. H-1117Budapest, Hungary
- Eötvös Lorand Research Network, Chronic Pain Research Group, University of Pécs, H7624, Pécs, Hungary
| | - Kata Bölcskei
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
| | - Angéla Kecskés
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
| | - Gábor Pethő
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624, Pécs, Hungary
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Rókus Str. 2, H-7624 , Pécs, Hungary
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László S, Bátai IZ, Berkó S, Csányi E, Dombi Á, Pozsgai G, Bölcskei K, Botz L, Wagner Ö, Pintér E. Development of Capsaicin-Containing Analgesic Silicone-Based Transdermal Patches. Pharmaceuticals (Basel) 2022; 15:ph15101279. [PMID: 36297391 PMCID: PMC9611826 DOI: 10.3390/ph15101279] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/29/2022] [Accepted: 10/13/2022] [Indexed: 12/03/2022] Open
Abstract
Transdermal therapeutic systems (TTSs) enable convenient dosing in drug therapy. Modified silicone-polymer-based patches are well-controlled and cost-effective matrix diffusion systems. In the present study, we investigated the substance release properties, skin penetration, and analgesic effect of this type of TTS loaded with low-dose capsaicin. Release properties were measured in Franz diffusion cell and continuous flow-through cell approaches. Capsaicin was detected with HPLC-UV and UV spectrophotometry. Raman spectroscopy was conducted on human skin samples exposed to the TTS. A surgical incision or carrageenan injection was performed on one hind paw of male Wistar rats. TTSs were applied to the epilated dorsal skin. Patches were kept on the animals for 6 h. The thermal hyperalgesia and mechanical pain threshold of the hind paws were detected. Patches exhibited controlled, zero-order kinetic capsaicin release. According to the Raman mapping, capsaicin penetrated into the epidermis and dermis of human skin, where the target receptors are expressed. The thermal pain threshold drop of the operated rat paws was reversed by capsaicin treatment compared to that of animals treated with control patches. It was concluded that our modified silicone-polymer-based capsaicin-containing TTS is suitable for the relief of traumatic and inflammatory pain.
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Affiliation(s)
- Szabolcs László
- Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
| | - István Z. Bátai
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
- Molecular Pharmacology Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, H-7624 Pécs, Hungary
| | - Szilvia Berkó
- Institute of Pharmaceutical Technology and Regulatory Affairs, Faculty of Pharmacy, University of Szeged, Eötvös str. 6, H-6720 Szeged, Hungary
| | - Erzsébet Csányi
- Institute of Pharmaceutical Technology and Regulatory Affairs, Faculty of Pharmacy, University of Szeged, Eötvös str. 6, H-6720 Szeged, Hungary
| | - Ágnes Dombi
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
- Molecular Pharmacology Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, H-7624 Pécs, Hungary
| | - Gábor Pozsgai
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
- Molecular Pharmacology Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, H-7624 Pécs, Hungary
- Correspondence: ; Tel.: +36-72-536-217
| | - Kata Bölcskei
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
- Molecular Pharmacology Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, H-7624 Pécs, Hungary
| | - Lajos Botz
- Department of Pharmaceutics and Central Clinical Pharmacy, Faculty of Pharmacy, University of Pécs, Honvéd u. 3., H-7624 Pécs, Hungary
| | - Ödön Wagner
- Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Erika Pintér
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti u. 12, H-7624 Pécs, Hungary
- Molecular Pharmacology Research Group, Szentágothai Research Centre, University of Pécs, Ifjúság ú. 20, H-7624 Pécs, Hungary
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Luo Q, Ding R, Chen L, Bu X, Xiao M, Liu X, Wu Y, Xu J, Tang W, Qiu J, Ding X, Tang X. The Association Between Spicy Food Intake and Risk of Hyperuricemia Among Chinese Adults. Front Public Health 2022; 10:919347. [PMID: 35874998 PMCID: PMC9298505 DOI: 10.3389/fpubh.2022.919347] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Accepted: 06/03/2022] [Indexed: 12/20/2022] Open
Abstract
Hyperuricemia is associated with substantial health and economic burden all over the world. Dietary habits are an important influencing factor of hyperuricemia. This study aimed to investigate the relationship between spicy food intake and hyperuricemia based on a large population. A total of 22,125 individuals aged 30-79 were enrolled in China Multi-Ethnic Cohort (CMEC), Chongqing region. Spicy food intake information was collected by a standardized questionnaire. The association between spicy food intake and hyperuricemia was estimated by multivariable logistic regression models and multiple linear regression models. Additionally, we explored these relations in subgroups stratified by sex and age. Furthermore, sensitivity analyses were conducted to verify the stability of current findings. After controlling for potential confounders, compared with participants who never consumed spicy food and consumed less hot, participants who ate 3-5 days per week and very hot had the highest risk of hyperuricemia; the ORs (95% CIs) were 1.28 (1.09, 1.5) and 1.22 (0.92, 1.63), respectively. Additionally, the corresponding ORs (95% CIs) for each level increment in the frequency and degree of pungency in spicy food intake were 1.04 (1.01, 1.07) (P trend = 0.009) and 1.15 (1.04, 1.26) (P trend = 0.004). Further in sex-stratified and age-stratified analysis, similar positive associations were observed among men and those aged 30-59, but no significant association was found among women and those aged 60-79. In the linear regression models, 3-5 days per week and moderate pungency in spicy food intake were associated with 5.21 μmol/L (95% CI: 1.72, 8.70) and 4.69 μmol/L (95% CI: 1.93, 7.45) higher serum urate level. Results in further subgroup analysis were generally consistent with the logistic regression models. This study suggests that spicy food intake may be a risk factor for hyperuricemia, especially in men and younger people, and more studies are warranted to verify the causal associations.
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Affiliation(s)
- Qinwen Luo
- School of Public Health, Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing, China
| | - Rui Ding
- First Clinical Medical College, Chongqing Medical University, Chongqing, China
| | - Liling Chen
- Chongqing Center for Disease Control and Prevention, Infectious Disease Control and Prevention Institute, Chongqing, China
| | - Xiaoqing Bu
- School of Public Health, Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing, China
| | - Meng Xiao
- School of Public Health, Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing, China
| | - Xiang Liu
- Department of Epidemiology and Health Statistics, West China School of Public Health, Sichuan University, Chengdu, China
| | - Yunyun Wu
- Chongqing Center for Disease Control and Prevention, Infectious Disease Control and Prevention Institute, Chongqing, China
| | - Jingru Xu
- Chongqing Center for Disease Control and Prevention, Infectious Disease Control and Prevention Institute, Chongqing, China
| | - Wenge Tang
- Chongqing Center for Disease Control and Prevention, Infectious Disease Control and Prevention Institute, Chongqing, China
| | - Jingfu Qiu
- School of Public Health, Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing, China
| | - Xianbin Ding
- Chongqing Center for Disease Control and Prevention, Infectious Disease Control and Prevention Institute, Chongqing, China
| | - Xiaojun Tang
- School of Public Health, Research Center for Medicine and Social Development, Chongqing Medical University, Chongqing, China
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Consolación Rodríguez-Palazón M, Arroyo-Manzanares N, Viñas P, Campillo N. Metabolomic study of capsaicinoid compounds in urine samples by dispersive liquid–liquid microextraction and ultra-high performance liquid chromatography with quadrupole time-of-flight mass spectrometry. Microchem J 2022. [DOI: 10.1016/j.microc.2022.107373] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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16
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Castro-Muñoz R, Gontarek-Castro E, Jafari SM. Up-to-date strategies and future trends towards the extraction and purification of Capsaicin: A comprehensive review. Trends Food Sci Technol 2022. [DOI: 10.1016/j.tifs.2022.03.014] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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17
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Erin N, Akman M, Aliyev E, Tanrıöver G, Korcum AF. Olvanil activates sensory nerve fibers, increases T cell response and decreases metastasis of breast carcinoma. Life Sci 2022; 291:120305. [PMID: 35016880 DOI: 10.1016/j.lfs.2022.120305] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 12/29/2021] [Accepted: 01/04/2022] [Indexed: 12/24/2022]
Abstract
BACKGROUND Inactivation of sensory neurons expressing transient receptor potential vanilloid 1 (TRPV1) enhances breast cancer metastasis. Sensory neurons have profound effects on immune response to a wide range of diseases including cancer. Hence, activation of sensory nerves using feasible approaches such as specific TRPV1 agonists may inhibit breast cancer metastasis through neuroimmune pathways. TRPV1 agonists are considered for the treatment of pain and inflammatory diseases. METHODS We here first determined the effects of four different TRPV1 agonists on proliferation of three different metastatic breast carcinoma cells since TRPV1 is also expressed in cancer cells. Based on the results obtained under in-vitro conditions, brain metastatic breast carcinoma cells (4TBM) implanted orthotopically into the mammary-pad of Balb-c mice followed by olvanil treatment (i.p.). Changes in tumor growth, metastasis and immune response to cancer cells were determined. RESULTS Olvanil dose-dependently activated sensory nerve fibers and markedly suppressed lung and liver metastasis without altering the growth of primary tumors. Olvanil (5 mg/kg) systemically increased T cell count, enhanced intra-tumoral recruitment of CD8+ T cells and increased IFN-γ response to irradiated cancer cells and Con-A. Anti-inflammatory changes such as increased IL-10 and decrease IL-6 as well as S100A8+ cells were observed following olvanil treatment. CONCLUSIONS Our results show that anti-metastatic effects of olvanil is mainly due to activation of neuro-immune pathways since olvanil dose used here is not high enough to directly activate immune cells. Furthermore, olvanil effectively depletes sensory neuropeptides; hence, olvanil is a good non-pungent alternative to capsaicin.
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Affiliation(s)
- Nuray Erin
- Akdeniz University, Faculty of Medicine, Department of Medical Pharmacology and Immunopharmacology and Immunooncology Unit, Antalya, Turkey.
| | - Muhlis Akman
- Akdeniz University, Faculty of Medicine, Department of Medical Pharmacology and Immunopharmacology and Immunooncology Unit, Antalya, Turkey
| | - Elnur Aliyev
- Akdeniz University, Faculty of Medicine, Department of Histology, Antalya, Turkey
| | - Gamze Tanrıöver
- Akdeniz University, Faculty of Medicine, Department of Histology, Antalya, Turkey
| | - Aylin F Korcum
- Akdeniz University, Faculty of Medicine, Department of Radiation Oncology, Antalya, Turkey
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Szallasi A. Capsaicin and cancer: Guilty as charged or innocent until proven guilty? Temperature (Austin) 2022; 10:35-49. [PMID: 37187832 PMCID: PMC10177684 DOI: 10.1080/23328940.2021.2017735] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 11/18/2021] [Accepted: 12/09/2021] [Indexed: 12/17/2022] Open
Abstract
With an estimated 2 billion chili pepper connoisseurs worldwide, the human exposure to capsaicin is enormous. Therefore, the question whether nutritional capsaicin is a cancer causing or cancer preventive agent is of utmost importance. The gamut of human epidemiology studies suggests that capsaicin in modest, "restaurant-like" doses is not only safe to eat, but it may even provide health benefits, such as lower cancer-related death rate. Very "hot" food is, however, probably better avoided. Importantly, no increased cancer risk was reported in patients following topical (skin or intravesical) capsaicin therapy. Aberrant capsaicin receptor TRPV1 expression was noted in various cancers with potential implications for cancer therapy, diagnosis and prognostication. Indeed, capsaicin can kill cancer cells by a combination of on- and off-target mechanisms, though it remains unclear if this can be exploited for therapeutic purposes. The literature on capsaicin and cancer is vast and controversial. This review aims to find answers to questions that are relevant for our daily life and medical practice.
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Affiliation(s)
- Arpad Szallasi
- Department of Pathology and Experimental Cancer Research, Semmelweis University, Budapest, Hungary
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Mota FVB, Coutinho FN, de Carvalho VMF, de Assis Correia JC, Bastos IVGA, Neto PPM, Ximenes RM, Brondani DJ, de Faria AR, Marchand P, da Silva TG. Antinociceptive Effects of Aza-Bicyclic Isoxazoline-Acylhydrazone Derivatives in Different Models of Nociception in Mice. Curr Top Med Chem 2022; 22:247-258. [PMID: 34986770 DOI: 10.2174/1568026622666220105102508] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Revised: 11/18/2021] [Accepted: 11/30/2021] [Indexed: 11/22/2022]
Abstract
BACKGROUND In a study recently published by our research group, the compounds isoxazoline-acylhydrazone derivatives R-99 and R-123 presented promising antinociceptive activity. However, the mechanism of action of this compound is still unknown. OBJECTIVE This study aimed to assess the mechanisms involved in the antinociceptive activity of these compounds in chemical models of pain. METHODS Animals were orally pretreated and evaluated in the acetic acid-, formalin-, capsaicin-, carrageenan- and Complete Freund's Adjuvant (CFA)-induced pain models in mice. The effects of the compounds after pretreatment with naloxone, prazosin, yohimbine, atropine, L-arginine, or glibenclamide were studied, using the acetic acid-induced writhing test to verify the possible involvement of opioid, α1-adrenergic, α2-adrenergic or cholinergic receptors, and nitric oxide or potassium channels pathways, respectively. RESULTS R-99 and R-123 compounds showed significant antinociceptive activity on pain models induced by acetic acid, formalin, and capsaicin. Both compounds decreased the mechanical hyperalgesia induced by carrageenan or CFA in mice. The antinociceptive effects of R-99 and R-123 on the acetic acid-induced writhing test were significantly attenuated by pretreatment with naloxone, yohimbine or atropine. R-99 also showed an attenuated response after pretreatment with atropine and glibenclamide. However, on the pretreatment with prazosin, there was no change in the animals' response to both compounds. CONCLUSION R-99 and R-123 showed antinociceptive effects related to mechanisms that involve, at least in part, interaction with the opioid and adrenergic systems and TRPV1 pathways. The compound R-99 also interacts with the cholinergic pathways and potassium channels.
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Affiliation(s)
| | - Felipe Neves Coutinho
- Department of Pharmaceutical Sciences, Federal University of Pernambuco (UFPE), Recife-PE, Brazil
| | | | | | | | | | - Rafael Matos Ximenes
- Department of Antibiotics, Federal University of Pernambuco (UFPE), Recife-PE, Brazil
| | - Dalci José Brondani
- Department of Pharmaceutical Sciences, Federal University of Pernambuco (UFPE), Recife-PE, Brazil
| | - Antônio Rodolfo de Faria
- Department of Pharmaceutical Sciences, Federal University of Pernambuco (UFPE), Recife-PE, Brazil
| | - Pascal Marchand
- Département de Chimie Thérapeutique, University of Nantes, 22 Boulevard Bénoni Goullin, France
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Dong X, Li Y, Yang K, Zhang L, Xue Y, Yu S, Liu X, Tu R, Qiao D, Luo Z, Liu X, Wang Y, Li W, Wang C. Associations of spicy food flavour and intake frequency with blood lipid levels and risk of abnormal serum lipid levels in Chinese rural population: a cross-sectional study. Public Health Nutr 2021; 24:6201-6210. [PMID: 33913411 PMCID: PMC11148618 DOI: 10.1017/s1368980021001853] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE The purpose of the current study was to investigate associations between spicy food intake and serum lipids levels in Chinese rural population. DESIGN Information on spicy food flavour and intake frequency was obtained using a two-item questionnaire survey. Dietary data were collected using a validated thirteen-item FFQ. Fasting blood samples were collected and measured for total cholesterol (TC), TAG, HDL-cholesterol and LDL-cholesterol. Multivariate linear and logistic regression models were employed to examine the relationship between spicy food and serum lipids levels according to the spicy food flavour and intake frequency, respectively. SETTING A cross-sectional study in Henan Province. PARTICIPANTS 38 238 participants aged 18-79 years old. RESULTS Spicy flavour and intake frequency were consistently associated with decreased TC and non-HDL-cholesterol levels but mildly associated with elevated TAG levels. Each level increment in spicy flavour was inversely associated with high TC (OR: 0·91; 95 % CI 0·88, 0·93) and high non-HDL-cholesterol (OR: 0·88; 95 % CI 0·85, 0·91) but positively associated with high TAG (OR: 1·04; 95 % CI 1·01, 1·07). Similarly, 1-d increment in spicy food intake frequency was also inversely associated with high TC (OR: 0·92; 95 % CI 0·91, 0·94) and high non-HDL-cholesterol (OR: 0·91; 95 % CI 0·89, 0·93) but positively associated with high TAG (OR: 1·04; 95 % CI 1·02, 1·06). CONCLUSIONS Spicy food intake was mildly associated with increased risk of abnormal TAG level, significantly associated with decreased risk of abnormal TC and non-HDL levels. Spicy food intake may be contribute to the management of lipid levels.
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Affiliation(s)
- Xiaokang Dong
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Yuqian Li
- Department of Clinical Pharmacology, School of Pharmaceutical Science, Zhengzhou University, Zhengzhou, HA, People's Republic of China
| | - Kaili Yang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Lulu Zhang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Yuan Xue
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Zhengzhou, HA, People's Republic of China
| | - Songcheng Yu
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Zhengzhou, HA, People's Republic of China
| | - Xiaotian Liu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Runqi Tu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
- Department of Preventive Medicine, Henan University of Chinese Medicine, Zhengzhou, HA, People's Republic of China
| | - Dou Qiao
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Zhicheng Luo
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Xue Liu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Yan Wang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
| | - Wenjie Li
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Zhengzhou, HA, People's Republic of China
| | - Chongjian Wang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, HA450001, People's Republic of China
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Wang H, Chen L, Shen D, Cao Y, Zhang X, Xie K, Wang C, Zhu S, Pei P, Guo Y, Bragg F, Yu M, Chen Z, Li L. Association between frequency of spicy food consumption and hypertension: a cross-sectional study in Zhejiang Province, China. Nutr Metab (Lond) 2021; 18:70. [PMID: 34229688 PMCID: PMC8259443 DOI: 10.1186/s12986-021-00588-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Accepted: 06/04/2021] [Indexed: 01/11/2023] Open
Abstract
BACKGROUND Hypertension is a known risk factor for multiple chronic diseases. Existing literature on the association between frequency of spicy food consumption and hypertension shows mixed findings. METHODS The analyses are based on the Tongxiang baseline dataset of the China Kadoorie Biobank prospective study, including data from electronic questionnaires, physical measurements and blood sample collection. A total of 53,916 participants aged 30-79 years were included in the final analysis. Multivariable logistic regression was used to estimate the association of spicy food consumption with hypertension, and multiple linear regression was performed to explore the association of spicy food consumption with systolic and diastolic blood pressure. RESULTS Of the 53,916 participants, 23,921 had prevalent hypertension. 12.3% of participants reported consuming spicy food weekly. Among female participants, after adjusting for socio-demographic status, lifestyle factors, BMI, waist circumference, sleep duration and snoring, when compared with females who never consumed spicy food, the odds ratios (95% CI) for hypertension were 1.02 (0.96-1.08), 0.90 (0.79-1.01), and 0.88 (0.78-0.99), respectively, for females who consumed spicy food less than once weekly, 1-2 times weekly, and ≥ 3 times weekly (Ptrend = 0.04). The corresponding odds ratios for males were 1.02 (0.95-1.09), 1.07 (0.95-1.20), and 0.91 (0.81-1.01), respectively (Ptrend = 0.39). Among current alcohol drinkers, compared to participants who never consumed spicy food, the odds ratio (95% CI) for hypertension among participants consuming spicy food daily was 0.98 (0.80-1.20). The corresponding figure for non-current drinkers was 0.72 (0.62-0.84). The association was stronger among non-current alcohol drinkers than among current drinkers (Pheterogeneity = 0.02). CONCLUSIONS Frequency of spicy food consumption is inversely associated with hypertension in females, but not in males.
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Affiliation(s)
- Hao Wang
- Department of NCDs Control and Prevention, Zhejiang Provincial Center for Diseases Control and Prevention, #3399 Binsheng Road, Binjiang District, Hangzhou, Zhejiang Province China
| | - Lingli Chen
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Dun Shen
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Yuan Cao
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Xiaoyi Zhang
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Kaixu Xie
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Chunmei Wang
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Shuiqing Zhu
- Department of NCDs Control and Prevention, Tongxiang City Center for Disease Control and Prevention, Tongxiang, China
| | - Pei Pei
- Chinese Academy of Medical Sciences, Beijing, China
| | - Yu Guo
- Chinese Academy of Medical Sciences, Beijing, China
| | - Fiona Bragg
- Medical Research Council Population Health Research Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - Min Yu
- Department of NCDs Control and Prevention, Zhejiang Provincial Center for Diseases Control and Prevention, #3399 Binsheng Road, Binjiang District, Hangzhou, Zhejiang Province China
| | - Zhengming Chen
- Medical Research Council Population Health Research Unit, Nuffield Department of Population Health, University of Oxford, Oxford, UK
| | - Liming Li
- Department of Epidemiology and Biostatistics, School of Public Health, Peking University Health Science Center, Beijing, China
- Peking University Center for Public Health and Epidemic Preparedness and Response, Beijing, China
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22
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Ramal-Sanchez M, Bernabò N, Valbonetti L, Cimini C, Taraschi A, Capacchietti G, Machado-Simoes J, Barboni B. Role and Modulation of TRPV1 in Mammalian Spermatozoa: An Updated Review. Int J Mol Sci 2021; 22:4306. [PMID: 33919147 PMCID: PMC8122410 DOI: 10.3390/ijms22094306] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 04/19/2021] [Accepted: 04/19/2021] [Indexed: 12/26/2022] Open
Abstract
Based on the abundance of scientific publications, the polymodal sensor TRPV1 is known as one of the most studied proteins within the TRP channel family. This receptor has been found in numerous cell types from different species as well as in spermatozoa. The present review is focused on analyzing the role played by this important channel in the post-ejaculatory life of spermatozoa, where it has been described to be involved in events such as capacitation, acrosome reaction, calcium trafficking, sperm migration, and fertilization. By performing an exhaustive bibliographic search, this review gathers, for the first time, all the modulators of the TRPV1 function that, to our knowledge, were described to date in different species and cell types. Moreover, all those modulators with a relationship with the reproductive process, either found in the female tract, seminal plasma, or spermatozoa, are presented here. Since the sperm migration through the female reproductive tract is one of the most intriguing and less understood events of the fertilization process, in the present work, chemotaxis, thermotaxis, and rheotaxis guiding mechanisms and their relationship with TRPV1 receptor are deeply analyzed, hypothesizing its (in)direct participation during the sperm migration. Last, TRPV1 is presented as a pharmacological target, with a special focus on humans and some pathologies in mammals strictly related to the male reproductive system.
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Affiliation(s)
- Marina Ramal-Sanchez
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
| | - Nicola Bernabò
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
- Institute of Biochemistry and Cell Biology (CNR-IBBC/EMMA/Infrafrontier/IMPC), National Research Council, Monterotondo Scalo, 00015 Rome, Italy
| | - Luca Valbonetti
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
- Institute of Biochemistry and Cell Biology (CNR-IBBC/EMMA/Infrafrontier/IMPC), National Research Council, Monterotondo Scalo, 00015 Rome, Italy
| | - Costanza Cimini
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
| | - Angela Taraschi
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
- Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise “G. Caporale”, Via Campo Boario 1, 64100 Teramo, Italy
| | - Giulia Capacchietti
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
| | - Juliana Machado-Simoes
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
| | - Barbara Barboni
- Faculty of Biosciences and Technology for Food, Agriculture and Environment, University of Teramo, 64100 Teramo, Italy; (N.B.); (L.V.); (C.C.); (A.T.); (G.C.); (J.M.-S.); (B.B.)
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Human Somatostatin SST 4 Receptor Transgenic Mice: Construction and Brain Expression Pattern Characterization. Int J Mol Sci 2021; 22:ijms22073758. [PMID: 33916620 PMCID: PMC8038480 DOI: 10.3390/ijms22073758] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 12/13/2022] Open
Abstract
Somatostatin receptor subtype 4 (SST4) has been shown to mediate analgesic, antidepressant and anti-inflammatory functions without endocrine actions; therefore, it is proposed to be a novel target for drug development. To overcome the species differences of SST4 receptor expression and function between humans and mice, we generated an SST4 humanized mouse line to serve as a translational animal model for preclinical research. A transposon vector containing the hSSTR4 and reporter gene construct driven by the hSSTR4 regulatory elements were created. The vector was randomly inserted in Sstr4-deficient mice. hSSTR4 expression was detected by bioluminescent in vivo imaging of the luciferase reporter predominantly in the brain. RT-qPCR confirmed the expression of the human gene in the brain and various peripheral tissues consistent with the in vivo imaging. RNAscope in situ hybridization revealed the presence of hSSTR4 transcripts in glutamatergic excitatory neurons in the CA1 and CA2 regions of the hippocampus; in the GABAergic interneurons in the granular layer of the olfactory bulb and in both types of neurons in the primary somatosensory cortex, piriform cortex, prelimbic cortex and amygdala. This novel SST4 humanized mouse line might enable us to investigate the differences of human and mouse SST4 receptor expression and function and assess the effects of SST4 receptor agonist drug candidates.
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An intensity matched comparison of laser- and contact heat evoked potentials. Sci Rep 2021; 11:6861. [PMID: 33767259 PMCID: PMC7994633 DOI: 10.1038/s41598-021-85819-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 01/28/2021] [Indexed: 11/08/2022] Open
Abstract
Previous studies comparing laser (LEPs) and contact heat evoked potentials (CHEPs) consistently reported higher amplitudes following laser compared to contact heat stimulation. However, none of the studies matched the perceived pain intensity, questioning if the observed difference in amplitude is due to biophysical differences between the two methods or a mismatch in stimulation intensity. The aims of the current study were twofold: (1) to directly compare the brain potentials induced by intensity matched laser and contact heat stimulation and (2) investigate how capsaicin-induced secondary hyperalgesia modulates LEPs and CHEPs. Twenty-one healthy subjects were recruited and measured at four experimental sessions: (1) CHEPs + sham, (2) LEPs + sham, (3) CHEPs + capsaicin, and (4) LEPs + capsaicin. Baseline (sham) LEPs latency was significantly shorter and amplitude significantly larger compared to CHEPs, even when matched for perceived pain. Neither CHEPs nor LEPs was sensitive enough to detect secondary hyperalgesia. These differences provide evidence that a faster heating rate results in an earlier and more synchronized LEPs than CHEPs. To our knowledge, this was the first study to match perceived intensity of contact heat and laser stimulations, revealing distinct advantages associated with the acquisition of LEPs.
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Goci E, Haloci E, Di Stefano A, Chiavaroli A, Angelini P, Miha A, Cacciatore I, Marinelli L. Evaluation of In Vitro Capsaicin Release and Antimicrobial Properties of Topical Pharmaceutical Formulation. Biomolecules 2021; 11:biom11030432. [PMID: 33804191 PMCID: PMC8001808 DOI: 10.3390/biom11030432] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 03/02/2021] [Accepted: 03/09/2021] [Indexed: 01/11/2023] Open
Abstract
(1) Background: Capsaicin is the main capsaicinoid of the Capsicum genus and it is responsible for the pungent taste. Medical uses of the fruits of chili peppers date from the ancient time until nowadays. Most of all, they are used topically as analgesic in anti-inflammatory diseases as rheumatism, arthritis and in diabetic neuropathy. Reports state that the Capsicum genus, among other plant genera, is a good source of antimicrobial and antifungal compounds. The aim of this study was the preparation of a pharmaceutical Carbopol-based formulation containing capsaicin and the evaluation of its in vitro release and antimicrobial and antifungal properties. (2) Methods: It was first stabilized with an extraction method from the Capsicum annuum fruits with 98% ethanol and then the identification and determination of Capsaicin in this extract was realized by HPLC. (3) Results and Conclusions: Rheological analyses revealed that the selected formulation exhibited a pseudo-plastic behavior. In vitro release studies of capsaicin from a Carbopol-based formulation reported that approximately 50% of capsaicin was release within 52 h. Additionally, the Carbopol-based formulation significantly increased the antimicrobial effects of capsaicin towards all tested bacteria and fungi strains.
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Affiliation(s)
- Enkelejda Goci
- Pharmacotherapeutic Research Center, Faculty of Medical Sciences, Aldent University, 1001 Tirana, Albania;
- Correspondence:
| | - Entela Haloci
- Department of Pharmacy, Faculty of Medicine, University of Medicine, 1001 Tirana, Albania;
| | - Antonio Di Stefano
- Department of Pharmacy, University of “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy; (A.D.S.); (A.C.); (I.C.); (L.M.)
| | - Annalisa Chiavaroli
- Department of Pharmacy, University of “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy; (A.D.S.); (A.C.); (I.C.); (L.M.)
| | - Paola Angelini
- Department of Chemistry, Biology and Biotechnology, University of Perugia, 06100 Perugia, Italy;
| | - Ajkuna Miha
- Pharmacotherapeutic Research Center, Faculty of Medical Sciences, Aldent University, 1001 Tirana, Albania;
| | - Ivana Cacciatore
- Department of Pharmacy, University of “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy; (A.D.S.); (A.C.); (I.C.); (L.M.)
| | - Lisa Marinelli
- Department of Pharmacy, University of “G. d’Annunzio” Chieti-Pescara, 66100 Chieti, Italy; (A.D.S.); (A.C.); (I.C.); (L.M.)
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26
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Bryndina IG, Shalagina MN, Protopopov VA, Sekunov AV, Zefirov AL, Zakirjanova GF, Petrov AM. Early Lipid Raft-Related Changes: Interplay between Unilateral Denervation and Hindlimb Suspension. Int J Mol Sci 2021; 22:ijms22052239. [PMID: 33668129 PMCID: PMC7956661 DOI: 10.3390/ijms22052239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/14/2021] [Accepted: 02/21/2021] [Indexed: 01/15/2023] Open
Abstract
Muscle disuse and denervation leads to muscle atrophy, but underlying mechanisms can be different. Previously, we have found ceramide (Cer) accumulation and lipid raft disruption after acute hindlimb suspension (HS), a model of muscle disuse. Herein, using biochemical and fluorescent approaches the influence of unilateral denervation itself and in combination with short-term HS on membrane-related parameters of rat soleus muscle was studied. Denervation increased immunoexpression of sphingomyelinase and Cer in plasmalemmal regions, but decreased Cer content in the raft fraction and enhanced lipid raft integrity. Preliminary denervation suppressed (1) HS-induced Cer accumulation in plasmalemmal regions, shown for both nonraft and raft-fractions; (2) HS-mediated decrease in lipid raft integrity. Similar to denervation, inhibition of the sciatic nerve afferents with capsaicin itself increased Cer plasmalemmal immunoexpression, but attenuated the membrane-related effects of HS. Finally, both denervation and capsaicin treatment increased immunoexpression of proapoptotic protein Bax and inhibited HS-driven increase in antiapoptotic protein Bcl-2. Thus, denervation can increase lipid raft formation and attenuate HS-induced alterations probably due to decrease of Cer levels in the raft fraction. The effects of denervation could be at least partially caused by the loss of afferentation. The study points to the importance of motor and afferent inputs in control of Cer distribution and thereby stability of lipid rafts in the junctional and extrajunctional membranes of the muscle.
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Affiliation(s)
- Irina G. Bryndina
- Department of Pathophysiology and Immunology, Izhevsk State Medical Academy, Kommunarov St. 281, Izhevsk 426034, Russia; (I.G.B.); (M.N.S.); (V.A.P.); (A.V.S.)
| | - Maria N. Shalagina
- Department of Pathophysiology and Immunology, Izhevsk State Medical Academy, Kommunarov St. 281, Izhevsk 426034, Russia; (I.G.B.); (M.N.S.); (V.A.P.); (A.V.S.)
| | - Vladimir A. Protopopov
- Department of Pathophysiology and Immunology, Izhevsk State Medical Academy, Kommunarov St. 281, Izhevsk 426034, Russia; (I.G.B.); (M.N.S.); (V.A.P.); (A.V.S.)
| | - Alexey V. Sekunov
- Department of Pathophysiology and Immunology, Izhevsk State Medical Academy, Kommunarov St. 281, Izhevsk 426034, Russia; (I.G.B.); (M.N.S.); (V.A.P.); (A.V.S.)
| | - Andrey L. Zefirov
- Institute of Neuroscience, Kazan State Medical University, Butlerova St. 49, Kazan 420012, Russia; (A.L.Z.); (G.F.Z.)
| | - Guzalia F. Zakirjanova
- Institute of Neuroscience, Kazan State Medical University, Butlerova St. 49, Kazan 420012, Russia; (A.L.Z.); (G.F.Z.)
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center “Kazan Scientific Center of RAS”, P. O. Box 30, Lobachevsky St. 2/31, Kazan 420111, Russia
| | - Alexey M. Petrov
- Institute of Neuroscience, Kazan State Medical University, Butlerova St. 49, Kazan 420012, Russia; (A.L.Z.); (G.F.Z.)
- Laboratory of Biophysics of Synaptic Processes, Kazan Institute of Biochemistry and Biophysics, Federal Research Center “Kazan Scientific Center of RAS”, P. O. Box 30, Lobachevsky St. 2/31, Kazan 420111, Russia
- Correspondence: or
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Horváth Á, Payrits M, Steib A, Kántás B, Biró-Süt T, Erostyák J, Makkai G, Sághy É, Helyes Z, Szőke É. Analgesic Effects of Lipid Raft Disruption by Sphingomyelinase and Myriocin via Transient Receptor Potential Vanilloid 1 and Transient Receptor Potential Ankyrin 1 Ion Channel Modulation. Front Pharmacol 2021; 11:593319. [PMID: 33584270 PMCID: PMC7873636 DOI: 10.3389/fphar.2020.593319] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 11/24/2020] [Indexed: 01/09/2023] Open
Abstract
Transient Receptor Potential (TRP) Vanilloid 1 and Ankyrin 1 (TRPV1, TRPA1) cation channels are expressed in nociceptive primary sensory neurons, and integratively regulate nociceptor and inflammatory functions. Lipid rafts are liquid-ordered plasma membrane microdomains rich in cholesterol, sphingomyelin and gangliosides. We earlier showed that lipid raft disruption inhibits TRPV1 and TRPA1 functions in primary sensory neuronal cultures. Here we investigated the effects of sphingomyelinase (SMase) cleaving membrane sphingomyelin and myriocin (Myr) prohibiting sphingolipid synthesis in mouse pain models of different mechanisms. SMase (50 mU) or Myr (1 mM) pretreatment significantly decreased TRPV1 activation (capsaicin)-induced nocifensive eye-wiping movements by 37 and 41%, respectively. Intraplantar pretreatment by both compounds significantly diminished TRPV1 stimulation (resiniferatoxin)-evoked thermal allodynia developing mainly by peripheral sensitization. SMase (50 mU) also decreased mechanical hyperalgesia related to both peripheral and central sensitizations. SMase (50 mU) significantly reduced TRPA1 activation (formalin)-induced acute nocifensive behaviors by 64% in the second, neurogenic inflammatory phase. Myr, but not SMase altered the plasma membrane polarity related to the cholesterol composition as shown by fluorescence spectroscopy. These are the first in vivo results showing that sphingolipids play a key role in lipid raft integrity around nociceptive TRP channels, their activation and pain sensation. It is concluded that local SMase administration might open novel perspective for analgesic therapy.
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Affiliation(s)
- Ádám Horváth
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Maja Payrits
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Anita Steib
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Boglárka Kántás
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Tünde Biró-Süt
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - János Erostyák
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary.,Department of Experimental Physics, Faculty of Sciences, University of Pécs, Pécs, Hungary
| | - Géza Makkai
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary.,Department of Experimental Physics, Faculty of Sciences, University of Pécs, Pécs, Hungary
| | - Éva Sághy
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary.,Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Hungary
| | - Zsuzsanna Helyes
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Éva Szőke
- Deparment of Pharmacology and Pharmacotherapy, University of Pécs, Medical School, Pécs, Hungary.,János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
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28
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Fischer MJM, Ciotu CI, Szallasi A. The Mysteries of Capsaicin-Sensitive Afferents. Front Physiol 2020; 11:554195. [PMID: 33391007 PMCID: PMC7772409 DOI: 10.3389/fphys.2020.554195] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Accepted: 11/13/2020] [Indexed: 12/11/2022] Open
Abstract
A fundamental subdivision of nociceptive sensory neurons is named after their unique sensitivity to capsaicin, the pungent ingredient in hot chili peppers: these are the capsaicin-sensitive afferents. The initial excitation by capsaicin of these neurons manifested as burning pain sensation is followed by a lasting refractory state, traditionally referred to as "capsaicin desensitization," during which the previously excited neurons are unresponsive not only to capsaicin but a variety of unrelated stimuli including noxious heat. The long sought-after capsaicin receptor, now known as TRPV1 (transient receptor potential cation channel, subfamily V member 1), was cloned more than two decades ago. The substantial reduction of the inflammatory phenotype of Trpv1 knockout mice has spurred extensive efforts in the pharmaceutical industry to develop small molecule TRPV1 antagonists. However, adverse effects, most importantly hyperthermia and burn injuries, have so far prevented any compounds from progressing beyond Phase 2. There is increasing evidence that these limitations can be at least partially overcome by approaches outside of the mainstream pharmaceutical development, providing novel therapeutic options through TRPV1. Although ablation of the whole TRPV1-expressing nerve population by high dose capsaicin, or more selectively by intersectional genetics, has allowed researchers to investigate the functions of capsaicin-sensitive afferents in health and disease, several "mysteries" remain unsolved to date, including the molecular underpinnings of "capsaicin desensitization," and the exact role these nerves play in thermoregulation and heat sensation. This review tries to shed some light on these capsaicin mechanisms.
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Affiliation(s)
- Michael J. M. Fischer
- Center of Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Cosmin I. Ciotu
- Center of Physiology and Pharmacology, Medical University of Vienna, Vienna, Austria
| | - Arpad Szallasi
- 1st Department of Pathology and Experimental Cancer Research, Semmelweis University, Budapest, Hungary
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Dong X, Li Y, Yang K, Zhang L, Xue Y, Yu S, Liu X, Tu R, Qiao D, Luo Z, Liu X, Wang Y, Li W, Zheng Z, Wang C. Mediation effect of body mass index on the association between spicy food intake and hyperuricemia in rural Chinese adults: the Henan rural cohort study. BMC Public Health 2020; 20:1629. [PMID: 33121467 PMCID: PMC7596996 DOI: 10.1186/s12889-020-09736-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Accepted: 10/21/2020] [Indexed: 12/22/2022] Open
Abstract
Background The relationship of spicy food intake with hyperuricemia remains unknown. The objective of this study was to examine the association between spicy food intake and hyperuricemia, and whether this association was mediated by body mass index (BMI) in Chinese rural population. Methods 38, 027 adults aged 18–79 years were recruited from the Henan Rural Cohort Study. Information on spicy food intake was obtained using a validated questionnaire survey. Multivariable logistic regression model was used to estimate the association between spicy food intake and hyperuricemia, multiple linear regression model was performed to estimate the relationships between spicy food intake, BMI and serum urate level. BMI was used as a mediator to evaluate the mediation effect. Results After adjusting for potential confounders, compared with no spicy food flavor, the odds ratio (OR) and 95% confidence interval (CI) of mild, middle, and heavy flavor for hyperuricemia were 1.09 (1.00–1.19), 1.10 (0.97–1.24), and 1.21 (1.10–1.46), respectively (Ptrend = 0.017). Similarly, compared with those without intake in spicy food, the multivariable adjusted OR (95% CI) of 1-2 days/week, 3–5 days/week, and 6–7 days/week were 1.15 (1.01–1.31), 1.14 (1.01–1.30) and 1.15 (1.05–1.26), respectively (Ptrend = 0.007). However, when we further controlling for BMI, the associations were substantially attenuated. Furthermore, mediation analysis showed that BMI play a full mediating role in the relationship of spicy food intake with hyperuricemia. Conclusion Spicy food flavor and intake frequency are positively related with hyperuricemia in Chinese rural population. BMI may play a full mediating role in the relationship. Trial registration The Henan Rural Cohort Study registered at Chinese Clinical Trial Register (Registration number: ChiCTR-OOC-15006699). Date of registration: 2015-07-06.
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Affiliation(s)
- Xiaokang Dong
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Yuqian Li
- Department of Clinical Pharmacology, School of Pharmaceutical Science, Zhengzhou University, Henan, Zhengzhou, PR, China
| | - Kaili Yang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Lulu Zhang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Yuan Xue
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Henan, Zhengzhou, PR, China
| | - Songcheng Yu
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Henan, Zhengzhou, PR, China
| | - Xiaotian Liu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Runqi Tu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Dou Qiao
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Zhicheng Luo
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Xue Liu
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Yan Wang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China
| | - Wenjie Li
- Department of Nutrition and Food Hygiene, College of Public Health, Zhengzhou University, Henan, Zhengzhou, PR, China
| | - Zhaohui Zheng
- Department of Rheumatology, The First Affiliated Hospital of Zhengzhou University, Henan, Zhengzhou, PR, China
| | - Chongjian Wang
- Department of Epidemiology and Biostatistics, College of Public Health, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, Henan, PR China.
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Low ZWK, Li Z, Owh C, Chee PL, Ye E, Dan K, Chan SY, Young DJ, Loh XJ. Recent innovations in artificial skin. Biomater Sci 2020; 8:776-797. [PMID: 31820749 DOI: 10.1039/c9bm01445d] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The skin is a "smart", multifunctional organ that is protective, self-healing and capable of sensing and many forms of artificial skins have been developed with properties and functionalities approximating those of natural skin. Starting from specific commercial products for the treatment of burns, progress in two fields of research has since allowed these remarkable materials to be viable skin replacements for a wide range of dermatological conditions. This review maps out the development of bioengineered skin replacements and synthetic skin substitutes, including electronic skins. The specific behaviors of these skins are highlighted, and the performances of both types of artificial skins are evaluated against this. Moving beyond mere replication, highly advanced artificial skin materials are also identified as potential augmented skins that can be used as flexible electronics for health-care monitoring and other applications.
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Affiliation(s)
- Zhi Wei Kenny Low
- Institute of Materials Research and Engineering, A*STAR, 2Fusionopolis Way, Innovis, #08-03, Singapore 138634.
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31
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Horváth Á, Biró-Sütő T, Kántás B, Payrits M, Skoda-Földes R, Szánti-Pintér E, Helyes Z, Szőke É. Antinociceptive Effects of Lipid Raft Disruptors, a Novel Carboxamido-Steroid and Methyl β-Cyclodextrin, in Mice by Inhibiting Transient Receptor Potential Vanilloid 1 and Ankyrin 1 Channel Activation. Front Physiol 2020; 11:559109. [PMID: 33071817 PMCID: PMC7539994 DOI: 10.3389/fphys.2020.559109] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/18/2020] [Indexed: 12/29/2022] Open
Abstract
Transient Receptor Potential Vanilloid 1 and Ankyrin 1 (TRPV1, TRPA1) cation channels are expressed in nociceptive primary sensory neurons, and play an integrative role in pain processing and inflammatory functions. Lipid rafts are liquid-ordered plasma membrane microdomains rich in cholesterol, sphingomyelin, and gangliosides. We earlier proved that lipid raft disintegration by cholesterol depletion using a novel carboxamido-steroid compound (C1) and methyl β-cyclodextrin (MCD) significantly and concentration-dependently inhibit TRPV1 and TRPA1 activation in primary sensory neurons and receptor-expressing cell lines. Here we investigated the effects of C1 compared to MCD in mouse pain models of different mechanisms. Both C1 and MCD significantly decreased the number of the TRPV1 activation (capsaicin)-induced nocifensive eye-wiping movements in the first hour by 45% and 32%, respectively, and C1 also in the second hour by 26%. Furthermore, C1 significantly decreased the TRPV1 stimulation (resiniferatoxin)-evoked mechanical hyperalgesia involving central sensitization processes, while its inhibitory effect on thermal allodynia was not statistically significant. In contrast, MCD did not affect these resiniferatoxin-evoked nocifensive responses. Both C1 and MCD had inhibitory action on TRPA1 activation (formalin)-induced acute nocifensive reactions (paw liftings, lickings, holdings, and shakings) in the second, neurogenic inflammatory phase by 36% and 51%, respectively. These are the first in vivo data showing that our novel lipid raft disruptor carboxamido-steroid compound exerts antinociceptive and antihyperalgesic effects by inhibiting TRPV1 and TRPA1 ion channel activation similarly to MCD, but in 150-fold lower concentrations. It is concluded that C1 is a useful experimental tool to investigate the effects of cholesterol depletion in animal models, and it also might open novel analgesic drug developmental perspectives.
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Affiliation(s)
- Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Tünde Biró-Sütő
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Boglárka Kántás
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Maja Payrits
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Rita Skoda-Földes
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - Eszter Szánti-Pintér
- Department of Organic Chemistry, Institute of Chemistry, University of Pannonia, Veszprém, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Pécs, Hungary
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Pécs, Hungary
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Upregulation of the TRPA1 Ion Channel in the Gastric Mucosa after Iodoacetamide-Induced Gastritis in Rats: A Potential New Therapeutic Target. Int J Mol Sci 2020; 21:ijms21165591. [PMID: 32764237 PMCID: PMC7460663 DOI: 10.3390/ijms21165591] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 07/20/2020] [Accepted: 07/28/2020] [Indexed: 02/08/2023] Open
Abstract
Acute gastritis is often untreatable by acid secretion-inhibiting drugs. Understanding the protective mechanisms including the role of Transient Receptor Potential Ankyrin1 (TRPA1) and Vanilloid1 (TRPV1) channels localized on capsaicin-sensitive afferents and non-neuronal structures might identify novel therapeutic approaches. Therefore, we characterized a translational gastritis model using iodoacetamide (IAA) and investigated TRPA1/V1 expressions. Wistar rats and CD1, C57Bl/6J mice were exposed to IAA-containing (0.05, 0.1, 0.2, 0.3, 0.5%) drinking water for 7 or 14 days. Body weight and water consumption were recorded daily. Macroscopic lesions were scored, qualitative histopathologic investigation was performed, TRPA1/V1 immunopositivity and mRNA expressions were measured. IAA induced a concentration-dependent weight loss and reduced water intake in both species. Hyperemia, submucosal edema, inflammatory infiltration and hemorrhagic erosions developed after 7 days, while ulcers after 14 days in rats. Trpa1 mRNA/protein expressions were upregulated at both timepoints. Meanwhile, TRPV1 immunopositivity was upregulated in the gastric corpus after 0.05% IAA ingestion, but downregulated after 0.2%, whereas Trpv1 mRNA did not change. Interestingly, no macroscopic/microscopic changes were observed in mice. These are the first data for the concentration- and duration-dependent changes in the IAA-induced gastritis in rats accompanied by TRPA1 upregulation, therefore, its therapeutic potential in gastritis should further be investigated.
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Roy A, Rasheed A, Sleeba AV, Rajagopal P. Molecular docking analysis of capsaicin with apoptotic proteins. Bioinformation 2020; 16:555-560. [PMID: 32994681 PMCID: PMC7505247 DOI: 10.6026/97320630016555] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2020] [Revised: 06/09/2020] [Accepted: 06/11/2020] [Indexed: 11/23/2022] Open
Abstract
Oral cancer is linked with apoptotic proteins such as Bcl-xl, Bcl-2 and Mcl-1. Therefore it is of interest to document the molecular docking analysis of capsaicin (principle present in the Capsicum annum) with apoptotic proteins in this context. We report the molecular binding features of capsaicin with apoptotic proteins such as Bcl-xl, Bcl-2 and Mcl-1 for further consideration.
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Affiliation(s)
- Anitha Roy
- Department of Pharmacology, Saveetha Dental College and Hospital, Saveetha Institute of Medical and Technical Sciences, Chennai, Tamil Nadu, India
| | - Arun Rasheed
- Department of Pharmaceutical Chemistry, Alshifa College of Pharmacy, Malappuram, Kerala
| | | | - Ponnulakshmi Rajagopal
- Central Research Laboratory, Meenakshi Academy of Higher Education and Research (Deemed to be University), Chennai-600 078, India
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Payrits M, Horváth Á, Biró-Sütő T, Erostyák J, Makkai G, Sághy É, Pohóczky K, Kecskés A, Kecskés M, Szolcsányi J, Helyes Z, Szőke É. Resolvin D1 and D2 Inhibit Transient Receptor Potential Vanilloid 1 and Ankyrin 1 Ion Channel Activation on Sensory Neurons via Lipid Raft Modification. Int J Mol Sci 2020; 21:ijms21145019. [PMID: 32708653 PMCID: PMC7404206 DOI: 10.3390/ijms21145019] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 07/12/2020] [Accepted: 07/13/2020] [Indexed: 12/11/2022] Open
Abstract
Transient Receptor Potential Vanilloid 1 and Ankyrin 1 (TRPV1, TRPA1) cation channels are expressed in nociceptive primary sensory neurons and regulate nociceptor and inflammatory functions. Resolvins are endogenous lipid mediators. Resolvin D1 (RvD1) is described as a selective inhibitor of TRPA1-related postoperative and inflammatory pain in mice acting on the G protein-coupled receptor DRV1/GPR32. Resolvin D2 (RvD2) is a very potent TRPV1 and TRPA1 inhibitor in DRG neurons, and decreases inflammatory pain in mice acting on the GPR18 receptor, via TRPV1/TRPA1-independent mechanisms. We provided evidence that resolvins inhibited neuropeptide release from the stimulated sensory nerve terminals by TRPV1 and TRPA1 activators capsaicin (CAPS) and allyl-isothiocyanate (AITC), respectively. We showed that RvD1 and RvD2 in nanomolar concentrations significantly decreased TRPV1 and TRPA1 activation on sensory neurons by fluorescent calcium imaging and inhibited the CAPS- and AITC-evoked 45Ca-uptake on TRPV1- and TRPA1-expressing CHO cells. Since CHO cells are unlikely to express resolvin receptors, resolvins are suggested to inhibit channel opening through surrounding lipid raft disruption. Here, we proved the ability of resolvins to alter the membrane polarity related to cholesterol composition by fluorescence spectroscopy. It is concluded that targeting lipid raft integrity can open novel peripheral analgesic opportunities by decreasing the activation of nociceptors.
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Affiliation(s)
- Maja Payrits
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
| | - Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Correspondence:
| | - Tünde Biró-Sütő
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
| | - János Erostyák
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Department of Experimental Physics, Faculty of Sciences, University of Pécs, Ifjúság str. 6, H-7624 Pécs, Hungary
| | - Géza Makkai
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Department of Experimental Physics, Faculty of Sciences, University of Pécs, Ifjúság str. 6, H-7624 Pécs, Hungary
| | - Éva Sághy
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Nagyvárad sq. 4, H-1089 Budapest, Hungary
| | - Krisztina Pohóczky
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - Angéla Kecskés
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
| | - Miklós Kecskés
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
- Institute of Physiology, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - János Szolcsányi
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary; (M.P.); (T.B.-S.); (É.S.); (K.P.); (A.K.); (J.S.); (Z.H.); (É.S.)
- János Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary; (J.E.); (G.M.); (M.K.)
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Duarte Y, Cáceres J, Sepúlveda RV, Arriagada D, Olivares P, Díaz-Franulic I, Stehberg J, González-Nilo F. Novel TRPV1 Channel Agonists With Faster and More Potent Analgesic Properties Than Capsaicin. Front Pharmacol 2020; 11:1040. [PMID: 32760273 PMCID: PMC7372189 DOI: 10.3389/fphar.2020.01040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2020] [Accepted: 06/26/2020] [Indexed: 01/12/2023] Open
Abstract
The transient receptor potential vanilloid 1 (TRPV1) ion channel is a member of the family of Transient Receptor Potential (TRP) channels that acts as a molecular detector of noxious signals in primary sensory neurons. Activated by capsaicin, heat, voltage and protons, it is also well known for its desensitization, which led to the medical use of topically applied TRPV1 agonist capsaicin for its long-lasting analgesic effects. Here we report three novel small molecules, which were identified using a Structure-Based Virtual Screening for TRPV1 from the ZINC database. The three compounds were tested using electrophysiological assays, which confirmed their capsaicin-like agonist activity. von Frey filaments were used to measure the analgesic effects of the compounds applied topically on tactile allodynia induced by intra-plantar carrageenan. All compounds had anti-nociceptive activity, but two of them showed faster and longer lasting analgesic effects than capsaicin. The present results suggest that TRPV1 agonists different from capsaicin could be used to develop topical analgesics with faster onset and more potent effects.
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Affiliation(s)
- Yorley Duarte
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Javier Cáceres
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Romina V Sepúlveda
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Diego Arriagada
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Pedro Olivares
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Ignacio Díaz-Franulic
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
| | - Jimmy Stehberg
- Laboratorio de Neurobiologia, Instituto de Ciencias Biomédicas, Facultad de Medicina y Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Fernando González-Nilo
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile.,Centro Interdisciplinario de Neurociencia de Valparaíso, Universidad de Valparaíso, Valparaíso, Chile
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Chandel C, Sharma VK, Rana PS, Dabral M, Aggrawal S, Saklani P. Assessment of antimicrobial and antioxidant potential of cytoplasmic male sterile lines of pepper. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-2902-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Topische Therapie des Pruritus – Tipps und Tricks. Hautarzt 2020; 71:511-517. [DOI: 10.1007/s00105-020-04605-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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39
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McBride JD, Miteva M. SnapshotDx Quiz: April 2020. J Invest Dermatol 2020. [DOI: 10.1016/j.jid.2020.02.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Erin N. Role of sensory neurons, neuroimmune pathways, and transient receptor potential vanilloid 1 (TRPV1) channels in a murine model of breast cancer metastasis. Cancer Immunol Immunother 2020; 69:307-314. [PMID: 31912230 DOI: 10.1007/s00262-019-02463-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2019] [Accepted: 12/26/2019] [Indexed: 12/23/2022]
Abstract
Sensory nerves sensitive to capsaicin are afferent nerve fibers which contain TRPV1 channels. Activation of these channels induces release of neuropeptides which regulate local blood flow and immune response. Inactivation of sensory neurons either with high-dose capsaicin treatment or local ablation of vagal sensory nerve activity markedly increases metastasis of breast carcinoma formed by 4T1 derivative cells. These cancer cells also induce an extensive systemic inflammatory response. Further findings have documented that lack of local sensory neuromediators alters phenotype of cancer cells within primary tumor leading to overgrowth of metastatic subsets. This might be due to decreases in local and systemic immune response to growing tumor. Specifically, Substance P, one of the most abundant sensory neuropeptides, enhances anti-tumoral immune response evoked by radiotherapy under in vivo conditions. These findings further suggest that activation of TRPV1 channels on sensory neurons may induce an anti-tumoral immune response. We are testing this hypothesis. Our initial results as reported here demonstrate anti-inflammatory consequences of low-dose systemic capsaicin treatment. In conclusion, sensory nerve fibers sensitive to capsaicin have important roles in defense against metastatic breast carcinoma; hence, controlled activation of these neural pathways might be effective in cancer therapy. Specifically, activation of sensory fibers of left vagus nerve using a perineuronal stimulation may inhibit metastasis of breast carcinoma. Likewise, pharmacological modulators of TRPV1 channels may induce anti-tumoral immune response. Exact players of this newly explored defense system are, however, only partly validated, and further studies are required.
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Affiliation(s)
- Nuray Erin
- Department of Medical Pharmacology, Immunopharmacology and Immunooncology Research Unit, School of Medicine, Akdeniz University, B-blok kat 1 Immunoloji, 07070, Antalya, Turkey.
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41
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Kántás B, Börzsei R, Szőke É, Bánhegyi P, Horváth Á, Hunyady Á, Borbély É, Hetényi C, Pintér E, Helyes Z. Novel Drug-Like Somatostatin Receptor 4 Agonists are Potential Analgesics for Neuropathic Pain. Int J Mol Sci 2019; 20:E6245. [PMID: 31835716 PMCID: PMC6940912 DOI: 10.3390/ijms20246245] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 12/05/2019] [Accepted: 12/09/2019] [Indexed: 02/06/2023] Open
Abstract
Somatostatin released from the capsaicin-sensitive sensory nerves mediates analgesic and anti-inflammatory effects via the somatostatin sst4 receptor without endocrine actions. Therefore, sst4 is considered to be a novel target for drug development in pain including chronic neuropathy, which is an emerging unmet medical need. Here, we examined the in silico binding, the sst4-linked G-protein activation on stable receptor expressing cells (1 nM to 10 μM), and the effects of our novel pyrrolo-pyrimidine molecules in mouse inflammatory and neuropathic pain models. All four of the tested compounds (C1-C4) bind to the same binding site of the sst4 receptor with similar interaction energy to high-affinity reference sst4 agonists, and they all induce G-protein activation. C1 is the more efficacious (γ-GTP-binding: 218.2% ± 36.5%) and most potent (EC50: 37 nM) ligand. In vivo testing of the actions of orally administered C1 and C2 (500 µg/kg) showed that only C1 decreased the resiniferatoxin-induced acute neurogenic inflammatory thermal allodynia and mechanical hyperalgesia significantly. Meanwhile, both of them remarkably reduced partial sciatic nerve ligation-induced chronic neuropathic mechanical hyperalgesia after a single oral administration of the 500 µg/kg dose. These orally active novel sst4 agonists exert potent anti-hyperalgesic effect in a chronic neuropathy model, and therefore, they can open promising drug developmental perspectives.
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Affiliation(s)
- Boglárka Kántás
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Rita Börzsei
- Department of Pharmacology, Faculty of Pharmacy, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - Éva Szőke
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Péter Bánhegyi
- Avicor Ltd., Herman Ottó str. 15, H-1022 Budapest, Hungary
| | - Ádám Horváth
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Ágnes Hunyady
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Éva Borbély
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Csaba Hetényi
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - Erika Pintér
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
| | - Zsuzsanna Helyes
- Department of Pharmacology and Pharmacotherapy, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
- Szentágothai Research Centre and Centre for Neuroscience, University of Pécs, Ifjúság str. 20, H-7624 Pécs, Hungary
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Hassanzadeh P, Atyabi F, Dinarvand R. The significance of artificial intelligence in drug delivery system design. Adv Drug Deliv Rev 2019; 151-152:169-190. [PMID: 31071378 DOI: 10.1016/j.addr.2019.05.001] [Citation(s) in RCA: 86] [Impact Index Per Article: 17.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 04/14/2019] [Accepted: 05/02/2019] [Indexed: 02/07/2023]
Abstract
Over the last decade, increasing interest has been attracted towards the application of artificial intelligence (AI) technology for analyzing and interpreting the biological or genetic information, accelerated drug discovery, and identification of the selective small-molecule modulators or rare molecules and prediction of their behavior. Application of the automated workflows and databases for rapid analysis of the huge amounts of data and artificial neural networks (ANNs) for development of the novel hypotheses and treatment strategies, prediction of disease progression, and evaluation of the pharmacological profiles of drug candidates may significantly improve treatment outcomes. Target fishing (TF) by rapid prediction or identification of the biological targets might be of great help for linking targets to the novel compounds. AI and TF methods in association with human expertise may indeed revolutionize the current theranostic strategies, meanwhile, validation approaches are necessary to overcome the potential challenges and ensure higher accuracy. In this review, the significance of AI and TF in the development of drugs and delivery systems and the potential challenging issues have been highlighted.
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Affiliation(s)
- Parichehr Hassanzadeh
- Nanotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 13169-43551, Iran.
| | - Fatemeh Atyabi
- Nanotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 13169-43551, Iran.
| | - Rassoul Dinarvand
- Nanotechnology Research Center, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran 13169-43551, Iran.
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Kuzma M, Fodor K, Almási A, Mózsik G, Past T, Perjési P. Toxicokinetic Study of a Gastroprotective Dose of Capsaicin by HPLC-FLD Method. Molecules 2019; 24:molecules24152848. [PMID: 31387338 PMCID: PMC6695877 DOI: 10.3390/molecules24152848] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 07/27/2019] [Accepted: 07/29/2019] [Indexed: 01/19/2023] Open
Abstract
BACKGROUND A low dose of capsaicin and its natural homologs and analogs (capsaicinoids) have shown to prevent development of gastric mucosal damage of alcohol and non-steroid anti-inflammatory drugs. Based on this experimental observation, a drug development program has been initiated to develop per os applicable capsaicin containing drugs to eliminate gastrointestinal damage caused by non-steroid anti-inflammatory drugs. METHODS As a part of this program, a sensitive and selective reverse-phase high-performance liquid chromatography-based method with fluorescence detection has been developed for quantification of capsaicin and dihydrocapsaicin in experimental dog's plasma. RESULTS The method was evaluated for a number of validation characteristics (selectivity, repeatability, and intermediate precision, LOD, LOQ, and calibration range). The limit of detection (LOD) was 2 ng/mL and the limit of quantification (LOQ) was 10 ng/mL for both capsaicin and dihydrocapsaicin. The method was used for analysis of capsaicin and dihydrocapsaicin in the plasma samples obtained after per os administration of low doses (0.1, 0.3, and 0.9 mg/kg bw) of Capsaicin Natural (USP 29) to the experimental animals. CONCLUSIONS The obtained results indicated that the administered capsaicinoids did not reach the general circulation.
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Affiliation(s)
- Mónika Kuzma
- Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
- Department of Forensic Medicine, Medical School, University of Pécs, Szigeti str. 12, H-7624 Pécs, Hungary
| | - Krisztina Fodor
- Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
| | - Attila Almási
- Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary
| | - Gyula Mózsik
- First Department of Medicine, Medical and Health Center, University of Pécs, Ifjúság str. 13, H-7624 Pécs, Hungary
| | - Tibor Past
- First Department of Medicine, Medical and Health Center, University of Pécs, Ifjúság str. 13, H-7624 Pécs, Hungary
| | - Pál Perjési
- Institute of Pharmaceutical Chemistry, Faculty of Pharmacy, University of Pécs, Rókus str. 2, H-7624 Pécs, Hungary.
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Oral gavage of capsaicin causes TRPV1-dependent acute hypothermia and TRPV1-independent long-lasting increase of locomotor activity in the mouse. Physiol Behav 2019; 206:213-224. [DOI: 10.1016/j.physbeh.2019.04.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 02/20/2019] [Accepted: 04/17/2019] [Indexed: 12/18/2022]
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Ramírez-Morales A, Hernández E, Rudomin P. Descending inhibition selectively counteracts the capsaicin-induced facilitation of dorsal horn neurons activated by joint nociceptive afferents. Exp Brain Res 2019; 237:1629-1641. [PMID: 30949729 DOI: 10.1007/s00221-019-05535-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 04/01/2019] [Indexed: 11/28/2022]
Abstract
Previous studies from our laboratory showed that in the anesthetized cat, the intradermal injection of capsaicin in the hindpaw facilitated the intraspinal field potentials (IFPs) evoked by stimulation of the intermediate and high-threshold myelinated fibers in the posterior articular nerve (PAN). The capsaicin-induced facilitation was significantly reduced 3-4 h after the injection, despite the persistence of hindpaw inflammation. Although this effect was attributed to an incremented descending inhibition acting on the spinal pathways, it was not clear if it was set in operation once the capsaicin-induced effects exceeded a certain threshold, or if it was continuously operating to keep the increased neuronal activation within manageable limits. To evaluate the changes in descending inhibition, we now examined the effects of successive reversible spinal blocks on the amplitude of the PAN IFPs evoked at different times after the intradermal injection of capsaicin. We found that after capsaicin the PAN IFPs recorded in laminae III-V by activation of high-threshold nociceptive Aδ myelinated fibers increased gradually during successive reversible spinal blocks, while the IFPs evoked by intermediate and low threshold proprioceptive Aβ afferents were only slightly affected. It is concluded that during the development of the central sensitization produced by capsaicin, there is a gradual increase of descending inhibition that tends to limit the nociceptive-induced facilitation, mainly by acting on the neuronal populations receiving inputs from the capsaicin-activated afferents without significantly affecting the information on joint angle transmitted by the low threshold afferents.
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Affiliation(s)
- A Ramírez-Morales
- Department of Physiology, Biophysics and Neurosciences, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - E Hernández
- Department of Physiology, Biophysics and Neurosciences, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico
| | - P Rudomin
- Department of Physiology, Biophysics and Neurosciences, Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional, Mexico City, Mexico. .,El Colegio Nacional, Mexico City, Mexico.
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Low ZWK, Li Z, Owh C, Chee PL, Ye E, Kai D, Yang DP, Loh XJ. Using Artificial Skin Devices as Skin Replacements: Insights into Superficial Treatment. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1805453. [PMID: 30690897 DOI: 10.1002/smll.201805453] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Indexed: 06/09/2023]
Abstract
Artificial skin devices are able to mimic the flexibility and sensory perception abilities of the skin. They have thus garnered attention in the biomedical field as potential skin replacements. This Review delves into issues pertaining to these skin-deep devices. It first elaborates on the roles that these devices have to fulfill as skin replacements, and identify strategies that are used to achieve such functionality. Following which, a comparison is done between the current state of these skin-deep devices and that of natural skin. Finally, an outlook on artificial skin devices is presented, which discusses how complementary technologies can create skin enhancements, and what challenges face such devices.
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Affiliation(s)
- Zhi Wei Kenny Low
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Zibiao Li
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Cally Owh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Pei Lin Chee
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
| | - Enyi Ye
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Dan Kai
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Da-Peng Yang
- College of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, 362000, Fujian Province, China
| | - Xian Jun Loh
- Institute of Materials Research and Engineering, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
- Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, Singapore, 117576, Singapore
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Maatuf Y, Geron M, Priel A. The Role of Toxins in the Pursuit for Novel Analgesics. Toxins (Basel) 2019; 11:toxins11020131. [PMID: 30813430 PMCID: PMC6409898 DOI: 10.3390/toxins11020131] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 02/17/2019] [Accepted: 02/20/2019] [Indexed: 12/19/2022] Open
Abstract
Chronic pain is a major medical issue which reduces the quality of life of millions and inflicts a significant burden on health authorities worldwide. Currently, management of chronic pain includes first-line pharmacological therapies that are inadequately effective, as in just a portion of patients pain relief is obtained. Furthermore, most analgesics in use produce severe or intolerable adverse effects that impose dose restrictions and reduce compliance. As the majority of analgesic agents act on the central nervous system (CNS), it is possible that blocking pain at its source by targeting nociceptors would prove more efficient with minimal CNS-related side effects. The development of such analgesics requires the identification of appropriate molecular targets and thorough understanding of their structural and functional features. To this end, plant and animal toxins can be employed as they affect ion channels with high potency and selectivity. Moreover, elucidation of the toxin-bound ion channel structure could generate pharmacophores for rational drug design while favorable safety and analgesic profiles could highlight toxins as leads or even as valuable therapeutic compounds themselves. Here, we discuss the use of plant and animal toxins in the characterization of peripherally expressed ion channels which are implicated in pain.
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Affiliation(s)
- Yossi Maatuf
- The Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 9112001, Israel.
| | - Matan Geron
- The Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 9112001, Israel.
| | - Avi Priel
- The Institute for Drug Research (IDR), School of Pharmacy, Faculty of Medicine, The Hebrew University of Jerusalem, Jerusalem 9112001, Israel.
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Sensitized vasoactive C-nociceptors: key fibers in peripheral neuropathic pain. Pain Rep 2019; 4:e709. [PMID: 30801047 PMCID: PMC6370139 DOI: 10.1097/pr9.0000000000000709] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/26/2018] [Accepted: 12/05/2018] [Indexed: 12/28/2022] Open
Abstract
Introduction Multiple mechanisms are involved in the development and persistence of neuropathic pain. Some patients with nerve damage will remain painless and develop a "loss of function" phenotype, whereas others develop painful neuropathies. Objectives The aim of this study is to investigate the role of a peripheral nervous system sensitization by analyzing patients with and without pain. Methods The topical application of capsaicin was investigated in peripheral nociceptors. Two groups of patients (painful vs painless) with length-dependent neuropathies and small-fiber impairment were tested. Quantitative sensory testing was assessed before and after topical application of 0.6% capsaicin in the affected skin. In addition, blood perfusion measurements and an axon reflex flare assessment were performed. Results Quantitative testing revealed that heat hyperalgesia was induced in all patients and volunteers (P < 0.01) without observing any significant differences between patient groups. By contrast, the extent of the axon reflex flare reaction (P < 0.01) as well as the blood perfusion (P < 0.05) was significantly greater in patients with pain than in neuropathy patients not experiencing pain. Conclusion Hyperexcitable vasoactive nociceptive C fibers might contribute to pain in peripheral neuropathies and therefore may serve as a key player in separating into a painless or painful condition.
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Bou Karam J, Cai W, Mohamed R, Huang T, Meng L, Homan EP, Dirice E, Kahn CR, El Ouaamari A. TRPV1 neurons regulate β-cell function in a sex-dependent manner. Mol Metab 2018; 18:60-67. [PMID: 30473098 PMCID: PMC6308974 DOI: 10.1016/j.molmet.2018.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 09/15/2018] [Accepted: 10/01/2018] [Indexed: 02/07/2023] Open
Abstract
There is emerging evidence to support an important role for the transient receptor potential vanilloid type 1 (TRPV1) sensory innervation in glucose homeostasis. However, it remains unknown whether the glucoregulatory action of these afferent neurons is sex-biased and whether it is pancreatic β-cell-mediated. OBJECTIVE We investigated in male and female mice whether denervation of whole-body or pancreas-projecting TRPV1 sensory neurons regulates adult functional β-cell mass and alters systemic glucose homeostasis. METHODS We used a combination of pharmacological and surgical approaches to ablate whole-body or pancreatic TRPV1 sensory neurons and assessed islet β-cell function and mass, aspects of glucose and insulin homeostasis, and energy expenditure. RESULTS Capsaicin-induced chemodenervation of whole-body TRPV1 sensory neurons improved glucose clearance and enhanced glucose-stimulated insulin secretion without alterations in β-cell proliferation and mass, systemic insulin sensitivity, body composition, and energy expenditure. Similarly, denervation of intrapancreatic TRPV1 afferents by pancreas intraductal injection of capsaicin or surgical removal of the dorsal root ganglia projecting into the pancreas lowered post-absorptive glucose levels and increased insulin release upon glucose stimulation. The beneficial effects of TRPV1 sensory denervation on glucose tolerance and β-cell function were observed in male but not female mice. CONCLUSION Collectively, these findings suggest that TRPV1 neurons regulate glucose homeostasis, at least partly, through direct modulation of glucose-induced insulin secretion and that this regulation operates in a sex-dependent manner.
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Affiliation(s)
- Joey Bou Karam
- Department of Medicine, Division of Endocrinology, Metabolism and Nutrition, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA; The Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Weikang Cai
- Section in Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA, USA
| | - Rowaida Mohamed
- Department of Medicine, Division of Endocrinology, Metabolism and Nutrition, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA; The Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Tianwen Huang
- Dana-Farber Cancer Institute and Department of Neurobiology, Harvard Medical School, Boston, MA, USA
| | - Lingqiong Meng
- Department of Medicine, Division of Endocrinology, Metabolism and Nutrition, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA; The Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA
| | - Erica Paige Homan
- Section in Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA, USA
| | - Ercument Dirice
- Section of Islet Cell and Regenerative Medicine, Joslin Diabetes Center, Boston, MA, USA
| | - C Ronald Kahn
- Section in Integrative Physiology and Metabolism, Joslin Diabetes Center, Boston, MA, USA
| | - Abdelfattah El Ouaamari
- Department of Medicine, Division of Endocrinology, Metabolism and Nutrition, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA; The Child Health Institute of New Jersey, Robert Wood Johnson Medical School, Rutgers, The State University of New Jersey, New Brunswick, NJ, USA.
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James K, Drummond PD. RAPID INDUCTION ANALGESIA FOR CAPSAICIN-INDUCED PAIN IN UNIVERSITY STUDENTS: A Randomized, Controlled Trial. Int J Clin Exp Hypn 2018; 66:428-450. [PMID: 30152737 DOI: 10.1080/00207144.2018.1495010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The effect of rapid-induction analgesia (RIA) hypnosis on capsaicin-induced pain was tested in 60 healthy volunteers allocated randomly to 1 of 3 conditions: listening to an RIA recording several times before and then during the session, only the in-session RIA intervention, or listening to relaxing music (the control condition). Participants who had listened to the RIA recording beforehand were significantly more relaxed than controls when differences between the groups were identified for pain intensity. These findings suggest that relaxation induced by RIA recordings can alleviate the affective component of pain. In addition, benefits of RIA may strengthen with practice.
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