M2-like macrophage infiltration and transforming growth factor-β secretion during socket healing process in mice.

Abstract:

OBJECTIVE:Macrophages are involved in tissue inflammation and repair through cytokine secretion. However, the contribution of macrophages to healing and osteogenesis after tooth extraction remains unclear. Therefore, we investigated the distribution of osteoblastic cells and macrophages in the early healing process after tooth extraction. METHODS:The maxillary first molars of 6-week-old male mice were extracted. The maxilla was collected 1, 3, and 7 days after extraction. The states of socket healing, localization of osteoblastic markers, and macrophage infiltration were sequentially observed by micro-CT imaging and immunohistochemistry. RESULTS:On day 3 after tooth extraction, α-smooth muscle actin (SMA)-positive cells, osteoprogenitor cells at fracture healing, were observed in the socket. Several α-SMA-positive cells also expressed Runx2, the early osteoblast differentiation marker. The infiltration of F4/80-positive, mature macrophages and CD206-positive, M2-like macrophages was noted in the socket. However, CD169-positive macrophages (Osteomac), which are involved in fracture healing, were not detected in the socket. F4/80-positive and CD206-positive macrophages also showed the localization of transforming growth factor-β (TGF-β), which promotes osteoprogenitor cell proliferation and early differentiation. Phosphorylated Smad3, a downstream mediator of the signal activity of TGF-β, was detected in α-SMA-positive cells. On day 7, the extracted socket contained a large amount of new bone. Tartrate-resistant acid phosphatase (TRAP)-positive osteoclasts were detected on bone surfaces. CONCLUSION:Our data indicate that M2-like macrophages regulate the proliferation and differentiation of α-SMA-positive cells by secreting TGF-β at the early stage of socket healing, and also suggest the importance of macrophages in healing and bone formation after tooth extraction.

journal_name

Arch Oral Biol

journal_title

Archives of oral biology

authors

Horibe K,Hara M,Nakamura H

doi

10.1016/j.archoralbio.2021.105042

subject

Has Abstract

pub_date

2021-01-08 00:00:00

pages

105042

eissn

0003-9969

issn

1879-1506

pii

S0003-9969(21)00005-4

journal_volume

123

pub_type

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