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J Cell Physiol. 2016 Jul;231(7):1621-7. doi: 10.1002/jcp.25263. Epub 2015 Dec 10.

Stretching Impacts Inflammation Resolution in Connective Tissue.

Author information

1
Department of Medicine, Division of Preventive Medicine, Harvard Institutes of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
2
Department of Medical Biostatistics, University of Vermont, Burlington, Vermont.
3
Department of Anesthesiology, Center for Experimental Therapeutics and Reperfusion Injury, Perioperative and Pain Medicine, Harvard Institutes of Medicine, Brigham and Women's Hospital, Harvard Medical School, Boston, Massachusetts.
4
Department of Neurological Sciences, University of Vermont College of Medicine, Vermont.

Abstract

Acute inflammation is accompanied from its outset by the release of specialized pro-resolving mediators (SPMs), including resolvins, that orchestrate the resolution of local inflammation. We showed earlier that, in rats with subcutaneous inflammation of the back induced by carrageenan, stretching for 10 min twice daily reduced inflammation and improved pain, 2 weeks after carrageenan injection. In this study, we hypothesized that stretching of connective tissue activates local pro-resolving mechanisms within the tissue in the acute phase of inflammation. In rats injected with carrageenan and randomized to stretch versus no stretch for 48 h, stretching reduced inflammatory lesion thickness and neutrophil count, and increased resolvin (RvD1) concentrations within lesions. Furthermore, subcutaneous resolvin injection mimicked the effect of stretching. In ex vivo experiments, stretching of connective tissue reduced the migration of neutrophils and increased tissue RvD1 concentration. These results demonstrate a direct mechanical impact of stretching on inflammation-regulation mechanisms within connective tissue.

PMID:
26588184
PMCID:
PMC5222602
DOI:
10.1002/jcp.25263
[Indexed for MEDLINE]
Free PMC Article

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