Pathogenic and protective roles of strain-specific P. acnes hyaluronidases in acne

摘要 痤疮是一种重要的皮肤疾病，据信是由皮肤痤疮丙酸杆菌引起的， 导致痤疮的原因尚不清楚。我们已经确定了两种类型的透明质酸酶，由不同的 痤疮丙酸杆菌的菌株，它们要么是促炎的，要么是抗炎的。重要的是，痤疮丙酸杆菌菌株的皮肤定殖 编码促炎透明质酸酶的基因与痤疮的发生有关， 表达抗炎透明质酸酶的痤疮丙酸杆菌菌株与健康皮肤有关。在 初步实验表明，透明质酸酶的促炎或抗炎特性是 与酶产生的透明质酸片段的大小有关。因此，我们假设， 透明质酸酶通过将透明质酸降解为不同大小而影响痤疮丙酸杆菌的痤疮发生潜力。到 1）我们建议研究透明质酸被P. 痤疮透明质酸酶、透明质酸片段与TLR 2/4的结合以及宿主对透明质酸酶的免疫应答 透明质酸碎片。2)我们建议通过测试来确定两种透明质酸酶对痤疮的贡献 充分表征的痤疮丙酸杆菌临床菌株和不表达透明质酸酶的痤疮丙酸杆菌突变菌株， 在一个新的小鼠痤疮模型中。3)我们还将研究以透明质酸酶为基础的预防或 治疗痤疮。

Abstract Acne is an important skin disorder believed to be caused by skin commensal P. acnes, although how P. acnes contributes to acne is unclear. We have identified two types of hyaluronidase enzymes, made by different strains of P. acnes, that are either pro- or anti-inflammatory. Importantly, skin colonization by P. acnes strains that encode the pro-inflammatory hyaluronidase is associated with development of acne, whereas colonization with P. acnes strains that express the anti-inflammatory hyaluronidase is associated with healthy skin. In preliminary experiments, we have shown that the pro- or anti-inflammatory property of the hyaluronidases is related to the size of hyaluronan fragments generated by the enzymes. Therefore, we hypothesize that hyaluronidases influence the acne-genic potential of P. acnes by degrading hyaluronan to different sizes. To address our hypothesis, 1) we propose to investigate the structural basis of hyaluronan degradation by P. acnes hyaluronidases, binding of hyaluronan fragments to TLR2/4 and host immune responses to the hyaluronan fragments. 2) We propose to determine the contribution of both hyaluronidases to acne by testing well characterized clinical strains of P. acnes and mutant strains of P. acnes that do not express hyaluronidase, in a new mouse acne model. 3) We will also investigate hyaluronidase-based strategies for preventing or treating acne.