Investigation of resident and recruited macrophages following disc injury in mice

© 2020 Orthopaedic Research Society. Published by Wiley Periodicals, Inc..

Macrophages, particularly M1 macrophages, produce proinflammatory cytokines and contribute to the degenerative process in injured intervertebral discs (IVDs). We previously showed that macrophages in both intact and injured IVDs increased following IVD injury. Resident macrophages and macrophages recruited from the peripheral blood have distinct roles in tissue. However, it remains to be determined whether increased macrophages derive from resident or recruited macrophages. We investigated the origin of M1 macrophages in injured IVDs using green fluorescent protein (GFP) transgenic bone marrow chimeric mice. The M1 macrophage marker, CD86, increased in both disc-derived resident macrophages and bone marrow-derived macrophages (BMMs) after lipopolysaccharide/interferon γ stimulation in vitro. Following IVD injury, the proportion of cells positive for the CD86 ligand, the F4/80 antigen, and the surface glycoprotein CD11b (CD86+ CD11b+ F4/80+) significantly increased in GFP+ populations at days 3, 7, and 14. In contrast, CD86+ CD11b+ F4/80+ cells in GFP- populations significantly increased on day 3, and thereafter decreased on days 7 and 14. The proportion of CD86+ CD11b+ F4/80+ cells in the GFP+ populations was significantly higher than that in the GFP- populations at days 1, 3, 7, and 14. Monocyte chemoattractant protein-1 expression in disc-derived macrophages, but not in BMMs, increased following interleukin-1β stimulation. Our results suggest M1 macrophages following IVD injury originate from recruited macrophages. Resident macrophages may behave differently in IVD injury. The role of resident macrophages needs to be clarified. Further investigation is needed.

Medienart:

E-Artikel

Erscheinungsjahr:

2020

Erschienen:

2020

Enthalten in:

Zur Gesamtaufnahme - volume:38

Enthalten in:

Journal of orthopaedic research : official publication of the Orthopaedic Research Society - 38(2020), 8 vom: 30. Aug., Seite 1703-1709

Sprache:

Englisch

Beteiligte Personen:

Kawakubo, Ayumu [VerfasserIn]
Uchida, Kentaro [VerfasserIn]
Miyagi, Masayuki [VerfasserIn]
Nakawaki, Mitsufumi [VerfasserIn]
Satoh, Masashi [VerfasserIn]
Sekiguchi, Hiroyuki [VerfasserIn]
Yokozeki, Yuji [VerfasserIn]
Inoue, Gen [VerfasserIn]
Takaso, Masashi [VerfasserIn]

Links:

Volltext

Themen:

147336-22-9
Chemokines
Green Fluorescent Proteins
Intervertebral disc
Journal Article
Macrophage
Recruitment inflammation
Research Support, Non-U.S. Gov't

Anmerkungen:

Date Completed 07.12.2020

Date Revised 14.12.2020

published: Print-Electronic

Citation Status MEDLINE

doi:

10.1002/jor.24590

funding:

Förderinstitution / Projekttitel:

PPN (Katalog-ID):

NLM305629417