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CGRPα 在 Trpv1-Cre 群体中有助于内脏痛觉。

CGRPα within the Trpv1-Cre population contributes to visceral nociception.

机构信息

Discipline of Human Physiology and Centre for Neuroscience, School of Medicine, Flinders University of South Australia , Adelaide , Australia.

Department of Neuroscience, Uppsala University , Uppsala , Sweden.

出版信息

Am J Physiol Gastrointest Liver Physiol. 2018 Feb 1;314(2):G188-G200. doi: 10.1152/ajpgi.00188.2017. Epub 2017 Sep 28.


DOI:10.1152/ajpgi.00188.2017
PMID:28971837
Abstract

The role of calcitonin gene-related peptide (CGRP) in visceral and somatic nociception is incompletely understood. CGRPα is highly expressed in sensory neurons of dorsal root ganglia and particularly in neurons that also express the transient receptor potential cation channel subfamily V member 1 (Trpv1). Therefore, we investigated changes in visceral and somatic nociception following deletion of CGRPα from the Trpv1-Cre population using the Cre/lox system. In control mice, acetic acid injection (0.6%, ip) caused significant immobility (time stationary), an established indicator of visceral pain. In CGRPα-mCherry;Trpv1-Cre mice, the duration of immobility was significantly less than controls, and the distance CGRPα-mCherry;Trpv1-Cre mice traveled over 20 min following acetic acid was significantly greater than controls. However, following acetic acid injection, there was no difference between genotypes in the writhing reflex, number of abdominal licks, or forepaw wipes of the cheek. CGRPα-mCherry;Trpv1-Cre mice developed more pronounced inflammation-induced heat hypersensitivity above baseline values compared with controls. However, analyses of noxious acute heat or cold transmission revealed no difference between genotypes. Also, odor avoidance test, odor preference test, and buried food test for olfaction revealed no differences between genotypes. Our findings suggest that CGRPα-mediated transmission within the Trpv1-Cre population plays a significant role in visceral nociceptive pathways underlying voluntary movement. Monitoring changes in movement over time is a sensitive parameter to identify differences in visceral nociception, compared with writhing reflexes, abdominal licks, or forepaw wipes of the cheek that were unaffected by deletion of CGRPα- from Trpv1-Cre population and likely utilize different mechanisms. NEW & NOTEWORTHY The neuropeptide calcitonin gene-related peptide (CGRP) is highly colocalized with transient receptor potential cation channel subfamily V member 1 (TRPV1)-expressing primary afferent neurons, but the functional role of CGRPα specifically in these neurons is unknown in pain processing from visceral and somatic afferents. We used cre-lox recombination to conditionally delete CGRPα from TRPV1-expressing neurons in mice. We show that CGRPα from within TRPV1-cre population plays an important role in visceral nociception but less so in somatic nociception.

摘要

降钙素基因相关肽(CGRP)在内脏和躯体伤害感受中的作用尚不完全清楚。CGRPα 在背根神经节感觉神经元中高度表达,特别是在也表达瞬时受体电位阳离子通道亚家族 V 成员 1(TRPV1)的神经元中。因此,我们使用 Cre/lox 系统研究了 TRPV1-Cre 群体中 CGRPα 缺失后内脏和躯体伤害感受的变化。在对照小鼠中,醋酸(0.6%,ip)注射导致明显的不动(时间静止),这是内脏疼痛的一个既定指标。在 CGRPα-mCherry;Trpv1-Cre 小鼠中,不动时间明显短于对照,并且在醋酸注射后 20 分钟内 CGRPα-mCherry;Trpv1-Cre 小鼠的移动距离明显大于对照。然而,在醋酸注射后,基因型之间在扭体反射、腹部舔舐次数或前爪擦脸颊次数方面没有差异。与对照相比,CGRPα-mCherry;Trpv1-Cre 小鼠在基线值以上表现出更明显的炎症诱导的热敏性。然而,对有害急性热或冷传递的分析显示基因型之间没有差异。此外,嗅觉回避试验、嗅觉偏好试验和嗅觉埋藏食物试验也没有显示基因型之间的差异。我们的研究结果表明,TRPV1-Cre 群体中 CGRPα 介导的传递在与自愿运动相关的内脏伤害感受通路中起着重要作用。与扭体反射、腹部舔舐或前爪擦脸颊相比,监测运动随时间的变化是识别内脏疼痛差异的一个敏感参数,而这些参数不受 TRPV1-Cre 群体中 CGRPα 缺失的影响,并且可能利用不同的机制。新的和值得注意的是,神经肽降钙素基因相关肽(CGRP)与瞬时受体电位阳离子通道亚家族 V 成员 1(TRPV1)表达的初级传入神经元高度共定位,但 CGRPα 在来自内脏和躯体传入的疼痛处理中的特定作用在这些神经元中尚不清楚。我们使用 cre-lox 重组来条件性地从 TRPV1 表达神经元中删除 CGRPα 在小鼠中。我们表明,TRPV1-cre 群体中的 CGRPα 在内脏伤害感受中起着重要作用,但在躯体伤害感受中作用较小。

相似文献

[1]
CGRPα within the Trpv1-Cre population contributes to visceral nociception.

Am J Physiol Gastrointest Liver Physiol. 2017-9-28

[2]
Imaging activation of peptidergic spinal afferent varicosities within visceral organs using novel CGRPα-mCherry reporter mice.

Am J Physiol Gastrointest Liver Physiol. 2016-11-1

[3]
TRPV1 sensitization mediates postinflammatory visceral pain following acute colitis.

Am J Physiol Gastrointest Liver Physiol. 2015-7-15

[4]
CGRPα-expressing sensory neurons respond to stimuli that evoke sensations of pain and itch.

PLoS One. 2012-5-1

[5]
Characteristics of sensory neuronal groups in CGRP-cre-ER reporter mice: Comparison to Nav1.8-cre, TRPV1-cre and TRPV1-GFP mouse lines.

PLoS One. 2018-6-4

[6]
Enhanced behavioral responses to cold stimuli following CGRPα sensory neuron ablation are dependent on TRPM8.

Mol Pain. 2014-11-19

[7]
Peptidergic CGRPα primary sensory neurons encode heat and itch and tonically suppress sensitivity to cold.

Neuron. 2013-3-21

[8]
Primary afferent neurons containing calcitonin gene-related peptide but not substance P in forepaw skin, dorsal root ganglia, and spinal cord of mice.

J Comp Neurol. 2015-12-1

[9]
Visceral and somatic pain modalities reveal Na 1.7-independent visceral nociceptive pathways.

J Physiol. 2017-4-15

[10]
Multimodal use of calcitonin gene-related peptide and substance P in itch and acute pain uncovered by the elimination of vesicular glutamate transporter 2 from transient receptor potential cation channel subfamily V member 1 neurons.

J Neurosci. 2014-10-15

引用本文的文献

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Glia. 2024-11

[2]
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Biomolecules. 2023-11-14

[3]
Enteric glia promote visceral hypersensitivity during inflammation through intercellular signaling with gut nociceptors.

Sci Signal. 2023-11-21

[4]
Piezo2 channels expressed by colon-innervating TRPV1-lineage neurons mediate visceral mechanical hypersensitivity.

Neuron. 2023-2-15

[5]
A compendium of validated pain genes.

WIREs Mech Dis. 2022-11

[6]
Estrogen metabolites increase nociceptor hyperactivity in a mouse model of uterine pain.

JCI Insight. 2022-5-23

[7]
Calcitonin gene related peptide α is dispensable for many danger-related motivational responses.

Sci Rep. 2021-8-10

[8]
Fever During Localized Inflammation in Mice Is Elicited by a Humoral Pathway and Depends on Brain Endothelial Interleukin-1 and Interleukin-6 Signaling and Central EP Receptors.

J Neurosci. 2021-6-16

[9]
The enteric nervous system in gastrointestinal disease etiology.

Cell Mol Life Sci. 2021-5

[10]
Optical clearing reveals TNBS-induced morphological changes of VGLUT2-positive nerve fibers in mouse colorectum.

Am J Physiol Gastrointest Liver Physiol. 2021-4-1

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