Activation of ventral tegmental area dopaminergic neurons reverses pathological allodynia resulting from nerve injury or bone cancer

Chronic pain induced by nerve damage due to trauma or invasion of cancer to the bone elicits severe ongoing pain as well as hyperalgesia and allodynia likely reflecting adaptive changes within central circuits that amplify nociceptive signals. The present study explored the possible contribution of...

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Veröffentlicht in:Molecular pain 2018-01, Vol.14, p.1744806918756406
Hauptverfasser: Watanabe, Moe, Narita, Michiko, Hamada, Yusuke, Yamashita, Akira, Tamura, Hideki, Ikegami, Daigo, Kondo, Takashige, Shinzato, Tatsuto, Shimizu, Takatsune, Fukuchi, Yumi, Muto, Akihiro, Okano, Hideyuki, Yamanaka, Akihiro, Tawfik, Vivianne L, Kuzumaki, Naoko, Navratilova, Edita, Porreca, Frank, Narita, Minoru
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container_start_page 1744806918756406
container_title Molecular pain
container_volume 14
creator Watanabe, Moe
Narita, Michiko
Hamada, Yusuke
Yamashita, Akira
Tamura, Hideki
Ikegami, Daigo
Kondo, Takashige
Shinzato, Tatsuto
Shimizu, Takatsune
Fukuchi, Yumi
Muto, Akihiro
Okano, Hideyuki
Yamanaka, Akihiro
Tawfik, Vivianne L
Kuzumaki, Naoko
Navratilova, Edita
Porreca, Frank
Narita, Minoru
description Chronic pain induced by nerve damage due to trauma or invasion of cancer to the bone elicits severe ongoing pain as well as hyperalgesia and allodynia likely reflecting adaptive changes within central circuits that amplify nociceptive signals. The present study explored the possible contribution of the mesolimbic dopaminergic circuit in promoting allodynia related to neuropathic and cancer pain. Mice with ligation of the sciatic nerve or treated with intrafemoral osteosarcoma cells showed allodynia to a thermal stimulus applied to the paw on the injured side. Patch clamp electrophysiology revealed that the intrinsic neuronal excitability of ventral tegmental area (VTA) dopamine neurons projecting to the nucleus accumbens (N.Acc.) was significantly reduced in those mice. We used tyrosine hydroxylase (TH)-cre mice that were microinjected with adeno-associated virus (AAV) to express channelrhodopsin-2 (ChR2) to allow optogenetic stimulation of VTA dopaminergic neurons in the VTA or in their N.Acc. terminals. Optogenetic activation of these cells produced a significant but transient anti-allodynic effect in nerve injured or tumor-bearing mice without increasing response thresholds to thermal stimulation in sham-operated animals. Suppressed activity of mesolimbic dopaminergic neurons is likely to contribute to decreased inhibition of N.Acc. output neurons and to neuropathic or cancer pain-induced allodynia suggesting strategies for modulation of pathological pain states.
doi_str_mv 10.1177/1744806918756406
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The present study explored the possible contribution of the mesolimbic dopaminergic circuit in promoting allodynia related to neuropathic and cancer pain. Mice with ligation of the sciatic nerve or treated with intrafemoral osteosarcoma cells showed allodynia to a thermal stimulus applied to the paw on the injured side. Patch clamp electrophysiology revealed that the intrinsic neuronal excitability of ventral tegmental area (VTA) dopamine neurons projecting to the nucleus accumbens (N.Acc.) was significantly reduced in those mice. We used tyrosine hydroxylase (TH)-cre mice that were microinjected with adeno-associated virus (AAV) to express channelrhodopsin-2 (ChR2) to allow optogenetic stimulation of VTA dopaminergic neurons in the VTA or in their N.Acc. terminals. Optogenetic activation of these cells produced a significant but transient anti-allodynic effect in nerve injured or tumor-bearing mice without increasing response thresholds to thermal stimulation in sham-operated animals. Suppressed activity of mesolimbic dopaminergic neurons is likely to contribute to decreased inhibition of N.Acc. output neurons and to neuropathic or cancer pain-induced allodynia suggesting strategies for modulation of pathological pain states.</description><identifier>ISSN: 1744-8069</identifier><identifier>EISSN: 1744-8069</identifier><identifier>DOI: 10.1177/1744806918756406</identifier><identifier>PMID: 29357732</identifier><language>eng</language><publisher>Los Angeles, CA: SAGE Publications</publisher><subject>Animals ; Bone cancer ; Bone Neoplasms - complications ; Bone Neoplasms - physiopathology ; Cancer ; Cancer Pain - etiology ; Cancer Pain - pathology ; Cancer Pain - physiopathology ; Cell activation ; Cell Line, Tumor ; Chronic pain ; Dopamine receptors ; Dopaminergic Neurons - metabolism ; Dopaminergic Neurons - pathology ; Electrophysiology ; Excitability ; Hydroxylase ; Hyperalgesia ; Hyperalgesia - etiology ; Hyperalgesia - pathology ; Hyperalgesia - physiopathology ; Ligation ; Male ; Mesolimbic system ; Mice, Inbred C57BL ; Neuralgia ; Neuralgia - pathology ; Neurons ; Nucleus accumbens ; Nucleus Accumbens - pathology ; Nucleus Accumbens - physiopathology ; Osteosarcoma ; Osteosarcoma cells ; Pain ; Pain perception ; Sarcoma ; Sciatic nerve ; Sciatic Nerve - injuries ; Sciatic Nerve - pathology ; Sciatic Nerve - physiopathology ; Trauma ; Tyrosine 3-monooxygenase ; Ventral Tegmental Area - pathology ; Ventral Tegmental Area - physiopathology ; Ventral tegmentum</subject><ispartof>Molecular pain, 2018-01, Vol.14, p.1744806918756406</ispartof><rights>The Author(s) 2018</rights><rights>The Author(s) 2018. 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Optogenetic activation of these cells produced a significant but transient anti-allodynic effect in nerve injured or tumor-bearing mice without increasing response thresholds to thermal stimulation in sham-operated animals. 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The present study explored the possible contribution of the mesolimbic dopaminergic circuit in promoting allodynia related to neuropathic and cancer pain. Mice with ligation of the sciatic nerve or treated with intrafemoral osteosarcoma cells showed allodynia to a thermal stimulus applied to the paw on the injured side. Patch clamp electrophysiology revealed that the intrinsic neuronal excitability of ventral tegmental area (VTA) dopamine neurons projecting to the nucleus accumbens (N.Acc.) was significantly reduced in those mice. We used tyrosine hydroxylase (TH)-cre mice that were microinjected with adeno-associated virus (AAV) to express channelrhodopsin-2 (ChR2) to allow optogenetic stimulation of VTA dopaminergic neurons in the VTA or in their N.Acc. terminals. Optogenetic activation of these cells produced a significant but transient anti-allodynic effect in nerve injured or tumor-bearing mice without increasing response thresholds to thermal stimulation in sham-operated animals. Suppressed activity of mesolimbic dopaminergic neurons is likely to contribute to decreased inhibition of N.Acc. output neurons and to neuropathic or cancer pain-induced allodynia suggesting strategies for modulation of pathological pain states.</abstract><cop>Los Angeles, CA</cop><pub>SAGE Publications</pub><pmid>29357732</pmid><doi>10.1177/1744806918756406</doi><oa>free_for_read</oa></addata></record>
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subjects Animals
Bone cancer
Bone Neoplasms - complications
Bone Neoplasms - physiopathology
Cancer
Cancer Pain - etiology
Cancer Pain - pathology
Cancer Pain - physiopathology
Cell activation
Cell Line, Tumor
Chronic pain
Dopamine receptors
Dopaminergic Neurons - metabolism
Dopaminergic Neurons - pathology
Electrophysiology
Excitability
Hydroxylase
Hyperalgesia
Hyperalgesia - etiology
Hyperalgesia - pathology
Hyperalgesia - physiopathology
Ligation
Male
Mesolimbic system
Mice, Inbred C57BL
Neuralgia
Neuralgia - pathology
Neurons
Nucleus accumbens
Nucleus Accumbens - pathology
Nucleus Accumbens - physiopathology
Osteosarcoma
Osteosarcoma cells
Pain
Pain perception
Sarcoma
Sciatic nerve
Sciatic Nerve - injuries
Sciatic Nerve - pathology
Sciatic Nerve - physiopathology
Trauma
Tyrosine 3-monooxygenase
Ventral Tegmental Area - pathology
Ventral Tegmental Area - physiopathology
Ventral tegmentum
title Activation of ventral tegmental area dopaminergic neurons reverses pathological allodynia resulting from nerve injury or bone cancer
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