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Published in: Inflammation Research 3/2014

01-03-2014 | Original Research Paper

Opioid signaling in mast cells regulates injury responses associated with heterotopic ossification

Authors: Lixin Kan, Amelia A. Mutso, Tammy L. McGuire, Apkar Vania Apkarian, John A. Kessler

Published in: Inflammation Research | Issue 3/2014

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Abstract

Introduction

Previous studies found that neuron specific enolase promoter (Nse-BMP4) transgenic mice have increased expression of the nociceptive mediator, substance P and exaggerated local injury responses associated with heterotopic ossification (HO). It is of interest great to know the pain responses in these mice and how the opioid signaling is involved in the downstream events such as mast cell (MC) activation.

Materials and methods

This study utilized a transgenic mouse model of HO in which BMP4 is expressed under the control of the Nse-BMP4. The tactile sensitivity and the cold sensitivity of the mice were measured in a classic inflammatory pain model (carrageenan solution injected into the plantar surface of the left hind paw). The MC activation and the expression profiles of different components in the opioid signaling were demonstrated through routine histology and immunohistochemistry and Western blotting, in the superficial and deep muscle injury models.

Results

We found that the pain responses in these mice were paradoxically attenuated or unchanged, and we also found increased expression of both Methionine Enkephalin (Met-Enk), and the μ-opioid receptor (MOR). Met-Enk and MOR both co-localized within activated MCs in limb tissues. Further, Nse-BMP4;MOR−/− double mutant mice showed attenuated MC activation and had a significant reduction in HO formation in response to injuries.

Conclusions

These observations suggest that opioid signaling may play a key role in MC activation and the downstream inflammatory responses associated with HO. In addition to providing insight into the role of MC activation and associated injury responses in HO, these findings suggest opioid signaling as a potential therapeutic target in HO and possibly others disorders involving MC activation.
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Metadata
Title
Opioid signaling in mast cells regulates injury responses associated with heterotopic ossification
Authors
Lixin Kan
Amelia A. Mutso
Tammy L. McGuire
Apkar Vania Apkarian
John A. Kessler
Publication date
01-03-2014
Publisher
Springer Basel
Published in
Inflammation Research / Issue 3/2014
Print ISSN: 1023-3830
Electronic ISSN: 1420-908X
DOI
https://doi.org/10.1007/s00011-013-0690-4

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