Foreign body response to subcutaneous biomaterial implants in a mast cell-deficient Kitw-sh murine model

被引:57
作者
Avula, M. N. [1 ]
Rao, A. N. [2 ]
McGill, L. D. [3 ]
Grainger, D. W. [1 ,2 ]
Solzbacher, F. [1 ,4 ]
机构
[1] Univ Utah, Dept Bioengn, Salt Lake City, UT 84112 USA
[2] Univ Utah, Dept Pharmaceut & Pharmaceut Chem, Salt Lake City, UT 84112 USA
[3] Univ Utah, Associated Reg & Univ Pathol Labs, Salt Lake City, UT 84112 USA
[4] Univ Utah, Dept Elect & Comp Engn, Salt Lake City, UT 84112 USA
关键词
Host response; Continuous glucose monitoring sensors; Combination device; Inflammation; Local drug delivery; TYROSINE KINASE INHIBITOR; C-KIT RECEPTOR; IN-VITRO; PLGA MICROSPHERES; MEDIATOR RELEASE; GROWTH-FACTOR; MICE; DEXAMETHASONE; DELIVERY; LIGAND;
D O I
10.1016/j.actbio.2013.12.056
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Mast cells (MCs)_are recognized for their functional role in wound-healing and allergic and inflammatory responses - host responses that are frequently detrimental to implanted biomaterials if extended beyond acute reactivity. These tissue reactions impact especially on the performance of sensing implants such as continuous glucose monitoring (CGM) devices. Our hypothesis that effective blockade of MC activity around implants could alter the host foreign body response (FBR) and enhance the in vivo lifetime of these implantable devices motivated this study. Stem cell factor and its ligand c-KIT receptor are critically important for MC survival, differentiation and degranulation. Therefore, an MC-deficient sash mouse model was used to assess MC relationships to the in vivo performance of CGM implants. Additionally, local delivery of a tyrosine kinase inhibitor (TKI) that inhibits c-KIT activity was also used to evaluate the role of MCs in modulating the FBR. Model sensor implants comprising polyester fibers coated with a rapidly dissolving polymer coating containing drug-releasing degradable microspheres were implanted subcutaneously in sash mice for various time points, and the FBR was evaluated for chronic inflammation and fibrous capsule formation around the implants. No significant differences were observed in the foreign body capsule formation between control and drug-releasing implant groups in MC-deficient mice. However, fibrous encapsulation was significantly greater around the drug-releasing implants in sash mice compared to drug-releasing implants in wild-type (e.g. MC-competent) mice. These results provide insights into the role of MCs in the FBR, suggesting that MC deficiency provides alternative pathways for host inflammatory responses to implanted biomaterials. (C) 2014 Acts Materialia Inc. Published by Elsevier Ltd. All rights reserved.
引用
收藏
页码:1856 / 1863
页数:8
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