The Role of SOX9 in IGF-II-Mediated Pulmonary Fibrosis.

The Role of SOX9 in IGF-II-Mediated Pulmonary Fibrosis.
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DOI:
10.3390/ijms241411234
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发表时间:
2023-07-08
影响因子:
5.6
通讯作者:
--
中科院分区:
生物学2区
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--
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与系统性硬化症(SSc)相关的肺纤维化(PF)导致显著的发病率和死亡率。我们以前报道过胰岛素样生长因子-II(IGF-II)在SSc患者的肺组织和成纤维细胞中过表达,IGF-II通过上调I型胶原、纤连蛋白和TGFβ促进纤维化。我们现在发现IGF-II增加促纤维化信号分子TGFβ2的mRNA水平,(p ≤ 0.01)和TGFβ3(p ≤ 0.05),III型胶原(p ≤ 0.01)和胶原蛋白翻译后修饰酶P4 HA 2(p ≤ 0.05)、P3H2(p ≤ 0.05)、LOX(p = 0.065)、LOXL2(p ≤ 0.05)、LOXL4(p ≤ 0.05)。IGF-II增加TGFβ2(p ≤ 0.01)以及COL 3A 1、P4 HA 2、P4 H β和LOXL 4(p ≤ 0.05)的蛋白水平。相反,IGF-II降低胶原降解酶组织蛋白酶(CTS)K、CTSB和CTSL的mRNA水平以及CTSK的蛋白水平(p ≤ 0.05)。与健康对照相比,SSc肺组织中SRY盒转录因子9(SOX 9)在mRNA(p ≤ 0.05)和蛋白质(p ≤ 0.01)水平上过表达。IGF-II通过IGF 1 R/IR混合受体诱导肺成纤维细胞中的SOX 9(p ≤ 0.05),SOX 9调节IGF-II下游的TGFβ2(p ≤ 0.05)、TGFβ3(p ≤ 0.05)、COL 3A 1(p ≤ 0.01)和P4 HA 2(p ≤ 0.001)。我们的研究结果确定了一个新的IGF-II信号轴和下游目标,在一个SOX 9依赖性和非依赖性的方式调节。我们的研究结果为IGF-II在促进肺纤维化中的作用提供了新的见解。
Pulmonary fibrosis (PF) associated with systemic sclerosis (SSc) results in significant morbidity and mortality. We previously reported that insulin-like growth factor-II (IGF-II) is overexpressed in lung tissues and fibroblasts from SSc patients, and IGF-II fosters fibrosis by upregulating collagen type I, fibronectin, and TGFβ. We now show that IGF-II augments mRNA levels of profibrotic signaling molecules TGFβ2 (p ≤ 0.01) and TGFβ3 (p ≤ 0.05), collagen type III (p ≤ 0.01), and the collagen posttranslational modification enzymes P4HA2 (p ≤ 0.05), P3H2 (p ≤ 0.05), LOX (p = 0.065), LOXL2 (p ≤ 0.05), LOXL4 (p ≤ 0.05) in primary human lung fibroblasts. IGF-II increases protein levels of TGFβ2 (p ≤ 0.01), as well as COL3A1, P4HA2, P4Hβ, and LOXL4 (p ≤ 0.05). In contrast, IGF-II decreases mRNA levels of the collagen degradation enzymes cathepsin (CTS) K, CTSB, and CTSL and protein levels of CTSK (p ≤ 0.05). The SRY-box transcription factor 9 (SOX9) is overexpressed in SSc lung tissues at the mRNA (p ≤ 0.05) and protein (p ≤ 0.01) levels compared to healthy controls. IGF-II induces SOX9 in lung fibroblasts (p ≤ 0.05) via the IGF1R/IR hybrid receptor, and SOX9 regulates TGFβ2 (p ≤ 0.05), TGFβ3 (p ≤ 0.05), COL3A1 (p ≤ 0.01), and P4HA2 (p ≤ 0.001) downstream of IGF-II. Our results identify a novel IGF-II signaling axis and downstream targets that are regulated in a SOX9-dependent and -independent manner. Our findings provide novel insights on the role of IGF-II in promoting pulmonary fibrosis.
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