Adipocyte lipolysis regulates skin repair

项目摘要 我的实验室最近发现了成熟脂肪细胞在皮肤创伤中的一个意想不到的有趣角色。 愈合：控制损伤后的炎症。特别是，我们发现成熟的脂肪细胞经历了脂肪分解。 将脂类释放到伤口床以引发炎症。我们的发现之所以重要，有几个原因。第一, 脂肪细胞已被证明可以促进伤口愈合和疤痕形成，但成熟脂肪细胞在这方面的作用如何 这一过程尚不清楚。其次，脂肪细胞的脂类释放，或脂解作用，已被证明可以调节 传统储存库中的炎症，但皮肤脂肪细胞是否调节必要的炎症过程 皮肤损伤后的情况尚不清楚。此外，脂肪细胞及其衍生物(脂肪酸和/或细胞因子) 是一种易于处理的细胞类型，可以创造一种个性化的治疗方法，促进慢性伤口患者的愈合。 最后，糖皮质激素已知会影响脂肪细胞的生物学，也会抑制伤口愈合，但是否 糖皮质激素对创面愈合的影响是通过脂肪细胞介导的，目前尚不清楚。到三个月 集中和互补的具体目标，本申请中提出的工作将利用多个 允许特定耗尽脂肪细胞、脂肪细胞脂解、脂质组学、脂质跟踪、 生物工程组织模型和新的生物分析测试平台来确定脂肪细胞来源的功能 皮肤损伤时的血脂，以及糖皮质激素、年龄、糖尿病和肥胖如何改变这些。我们将(1) 确定脂肪细胞衍生的脂质在皮肤伤口愈合过程中炎症过程中的作用，(2)确定 糖皮质激素通过消耗成熟真皮脂肪细胞的脂类来影响伤口愈合，(3)定义 脂肪细胞脂肪酸是否可以调节衰老和糖尿病小鼠的伤口愈合，或者是否改变了人类的伤口愈合 皮肤。这些研究将确定特定的促进愈合的细胞群体和分子，这些细胞和分子可以用于 促进伤口愈合缺陷或其他皮肤病患者的愈合。

Project Summary My laboratory recently uncovered an unexpected and intriguing role for mature adipocytes during skin wound healing: control of inflammation after injury. In particular, we identified that mature adipocytes undergo lipolysis to release of lipids into wound beds to initiate inflammation. Our findings are important for several reasons. First, adipocytes have been shown to improve wound healing and scarring yet how mature adipocytes function in this process is unclear. Second, the release of lipids from adipocytes, or lipolysis, has been shown to modulate inflammation in traditional depots, yet whether skin adipocytes regulate the essential inflammatory processes following skin injury is not known. Furthermore, adipocytes and their derivatives (fatty acids and/or cytokines) are a tractable cell type to create a personalized therapy to promote healing in patients with chronic wounds. Finally, glucocorticoids are known to influence adipocyte biology and also to inhibit wound healing, but whether the effect of glucocorticoids on wound healing is mediated through adipocytes is not known. Through three focused and complementary Specific Aims, the work proposed in this application will take advantage of multiple genetic mouse models that allow specific depletion of adipocytes, adipocyte lipolysis, lipidomics, lipid tracking, bioengineered tissue models, and a novel bioanalytical assay platform to define the function adipocyte-derived lipids during skin injury and how these are altered with glucocorticoids, age, diabetes and obesity. We will (1) identify the role of adipocyte derived lipids during inflammation during skin wound healing, (2) determine whether glucocorticoids influence wound healing through depletion of lipids from mature, dermal adipocytes, (3) define whether adipocyte fatty acids can modulate wound healing in aged and diabetic mice or are altered in human skin. These studies will identify specific pro-healing cell populations and molecules that can be utilized to promote healing in human patients with defective wound healing or other skin disorders.