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Macrophage phenotype and remodeling outcomes in response to biologic scaffolds with and without a cellular component.

机译:巨噬细胞表型和重塑结果响应有或没有细胞成分的生物支架。

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Recently, macrophages have been characterized as having an M1 or M2 phenotype based on receptor expression, cytokine and effector molecule production, and function. The effects of macrophage phenotype upon tissue remodeling following the implantation of a biomaterial are largely unknown. The objectives of this study were to determine the effects of a cellular component within an implanted extracellular matrix (ECM) scaffold upon macrophage phenotype, and to determine the relationship between macrophage phenotype and tissue remodeling. Partial-thickness defects in the abdominal wall musculature of Sprague-Dawley rats were repaired with autologous body wall tissue, acellular allogeneic rat body wall ECM, xenogeneic pig urinary bladder tissue, or acellular xenogeneic pig urinary bladder ECM. At 3, 7, 14, and 28 days the host tissue response was characterized using histologic, immunohistochemical, and RT-PCR methods. The acellular test articles were shown to elicit a predominantly M2 type response and resulted in constructive remodeling, while those containing a cellular component, even an autologous cellular component, elicited a predominantly M1 type response and resulted in deposition of dense connective tissue and/or scarring. We conclude that the presence of cellular material within an ECM scaffold modulates the phenotype of the macrophages participating in the host response following implantation, and that the phenotype of the macrophages participating in the host response appears to be related to tissue remodeling outcome.
机译:最近,基于受体表达,细胞因子和效应分子的产生以及功能,巨噬细胞已被表征为具有M1或M2表型。巨噬细胞表型对生物材料植入后组织重塑的影响尚不清楚。这项研究的目的是确定在植入的细胞外基质(ECM)支架内的细胞成分对巨噬细胞表型的影响,并确定巨噬细胞表型与组织重塑之间的关系。用自体体壁组织,无细胞异体大鼠体壁ECM,异种猪膀胱组织或无细胞异种猪膀胱ECM修复Sprague-Dawley大鼠腹壁肌肉部分厚度的缺陷。在第3、7、14和28天,使用组织学,免疫组织化学和RT-PCR方法表征宿主组织反应。脱细胞测试样品显示出主要引起M2型反应并导致结构性重塑,而包含细胞成分甚至自体细胞成分的那些引起了M1类型反应,并导致密集的结缔组织沉积和/或瘢痕形成。 。我们得出结论,在植入ECM支架后,细胞材料的存在会调节参与宿主反应的巨噬细胞的表型,并且参与宿主反应的巨噬细胞的表型似乎与组织重塑的结果有关。

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