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Modified foreign body reaction to silicone imbedded in subcutaneous tissues by different mouse systemic immune conditions

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Title: Modified foreign body reaction to silicone imbedded in subcutaneous tissues by different mouse systemic immune conditions
Authors: Yamakawa, Tomohiro Browse this author
Ichii, Osamu Browse this author →KAKEN DB
Nakamura, Teppei Browse this author
Namba, Takashi Browse this author
Elewa, Yaser Hosny Ali Browse this author →ORCID
Masum, Md. Abdul Browse this author
Otani, Yuki Browse this author
Nishimura, Takanori Browse this author
Kon, Yasuhiro Browse this author →KAKEN DB
Keywords: fibrosis
foreign body reaction
Issue Date: 30-Jun-2022
Publisher: John Wiley & Sons
Journal Title: Journal of biomedical materials research part A
Publisher DOI: 10.1002/jbm.a.37425
Abstract: Foreign body reaction (FBR) causes unexpected adverse effects due to implanted materials in humans and animals. Inflammation and subsequent fibrosis during FBR seems to be affected by recipient immunity, such as the balance of T helper (Th) response that has the potential to regulate FBR-related macrophage function. Here, the immunological effects of FBR on subcutaneously imbedded silicone tubes (ST) at 8 weeks were investigated histologically by comparing Th1-biased C57BL/6N, Th2-biased MRL/MpJ, and autoimmune disease-prone MRL/MpJ-Fas(lpr/lpr). Tissue surrounding ST (TSS) was analyzed at day (D) 7 and 14 (reaction phase) or D35 (stability phase) after surgery. In all strains, the TSS was composed of a thin layer (TL) containing fibrous tissues and loose connective tissues formed outside the TL. Few lymphocytes and mast cells, several neutrophils, and numerous macrophages infiltrated the TSS. Active vascularization was observed at D14 in all strains. For the examined indices, M1-type macrophage density in the TSS of C57BL/6N mice was significantly higher at D14 compared to other strains. No significant strain difference relating to M2-type macrophages was detected, suggesting the effects of Th1-biased immunity on FBR-related inflammation. Collagen fibers in the TSS increased in density and became stable with age in all strains. In particular, MRL/MpJ-Fas(lpr/lpr) showed progressive fibrotic features. Serum autoantibody levels in MRL/MpJ-Fas(lpr/lpr) mice were inversely correlated with M1-type macrophage density. These data from MRL/MpJ-Fas(lpr/lpr) mice suggested modifications of FBR-related inflammation and fibrosis by autoimmune abnormalities. The results provide crucial insights into the pathological modification of FBR by recipient immunity and emphasize its clinicopathological importance in humans and animals.
Rights: This is the peer reviewed version of the following article: Journal of Biomedical Materials Research Part A, 2022.; 1- 11. doi:10.1002/jbm.a.37425, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.
Type: article (author version)
Appears in Collections:獣医学院・獣医学研究院 (Graduate School of Veterinary Medicine / Faculty of Veterinary Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 市居 修

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