Volume 61, Issue 5 pp. 662-670
BASIC SCIENCE RESEARCH ARTICLE

Mechanisms underlying immobilization-induced muscle pain in rats

Satoshi Oga MS

Satoshi Oga MS

Department of Locomotive Rehabilitation Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Department of Rehabilitation, Japanese Red Cross Nagasaki Genbaku Hospital, Nagasaki, Japan

Search for more papers by this author
Kyo Goto PhD

Kyo Goto PhD

Department of Rehabilitation, Nagasaki Memorial Hospital, Nagasaki, Japan

Search for more papers by this author
Junya Sakamoto PhD

Corresponding Author

Junya Sakamoto PhD

Department of Physical Therapy Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Correspondence

Junya Sakamoto PhD, Department of Physical Therapy Science, Nagasaki University Graduate School of Biomedical Sciences, 1-7-1 Sakamoto, Nagasaki 852-8520, Japan.

Email: [email protected]

Search for more papers by this author
Yuichiro Honda PhD

Yuichiro Honda PhD

Department of Rehabilitation, Nagasaki University Hospital, Nagasaki, Japan

Search for more papers by this author
Ryo Sasaki MS

Ryo Sasaki MS

Department of Locomotive Rehabilitation Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Department of Rehabilitation, Juzenkai Hospital, Nagasaki, Japan

Search for more papers by this author
Kumiko Ishikawa MS

Kumiko Ishikawa MS

Department of Rehabilitation, Nagasaki University Hospital, Nagasaki, Japan

Search for more papers by this author
Hideki Kataoka PhD

Hideki Kataoka PhD

Department of Rehabilitation, Nagasaki Memorial Hospital, Nagasaki, Japan

Search for more papers by this author
Jiro Nakano PhD

Jiro Nakano PhD

Department of Physical Therapy Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Search for more papers by this author
Tomoki Origuchi MD

Tomoki Origuchi MD

Department of Locomotive Rehabilitation Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Search for more papers by this author
Minoru Okita PhD

Minoru Okita PhD

Department of Locomotive Rehabilitation Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan

Search for more papers by this author
First published: 21 February 2020
Citations: 12
Funding information JSPS KAKENHI, Grant Number: JP18K17751

Funding information: JSPS KAKENHI, Grant/Award Number: JP18K17751

Abstract

Introduction

We investigated the mechanisms underlying immobilization-induced muscle pain in rats.

Methods

In rat skeletal muscle, pressure pain threshold (PPT) of the gastrocnemius muscle was measured, and nerve growth factor (NGF) level, peripheral nerve fiber density, macrophage number, and interleukin-1β (IL-1β) mRNA expression were examined. An NGF receptor inhibitor was injected intramuscularly to assess the relationship between PPT and NGF levels.

Results

Immobilization resulted in a decrease in PPT and increases in NGF level, C-fiber density, M1 macrophage number, and IL-1β mRNA expression. Injection of NGF receptor inhibitor reversed the decrease in PPT.

Discussion

NGF upregulation may be a major contributor to immobilization-induced muscle pain. The increases in C-fiber density, M1 macrophage number, and IL-1β mRNA expression may be related to immobilization-induced muscle pain.

5 CONFLICT OF INTEREST

The authors declare no potential conflicts of interest.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.

click me