BMP and Activin Membrane Bound Inhibitor Regulates the Extracellular Matrix in the Trabecular Meshwork.

BMP and Activin Membrane Bound Inhibitor Regulates the Extracellular Matrix in the Trabecular Meshwork.
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DOI:
10.1167/iovs.17-23282
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发表时间:
2018-04-01
影响因子:
4.4
通讯作者:
McDowell CM
McDowell CM
中科院分区:
医学2区
文献类型:
--
作者:
Hernandez H;Millar JC;Curry SM;Clark AF;McDowell CM

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小梁网(TM)在房水流出和眼压的调节中具有重要作用。 TGFβ2 对细胞外基质 (ECM) 的调节已得到广泛研究。骨形态发生蛋白 (BMP) 和激活素膜结合抑制剂 (BAMBI) 已被证明可以抑制或调节 TGFβ2 信号传导。我们研究了 TGFβ2 和 BAMBI 在 TM ECM 和高眼压调节中的作用。小鼠 TM (MTM) 细胞分离自 B6;129S1-Bambitm1Jian/J flox 小鼠,其特征为 TGFβ2 和地塞米松 (DEX) 诱导的纤连蛋白、胶原蛋白 1、胶原蛋白 4、层粘连蛋白、α-平滑肌肌动蛋白、交联肌动蛋白网络 (CLAN) 形成和 DEX 诱导的肌纤蛋白 (MYOC) 表达表达。 MTM 细胞用 Ad5.GFP 转导以鉴定转导效率。 MTM 细胞和小鼠眼睛用 Ad5.Null、Ad5.Cre、Ad5.TGFβ2 或 Ad5.TGFβ2 + Ad5.Cre 转导,以评估对 ECM 产生、IOP 和流出设施的影响。 MTM 细胞表达 TM 标记物并对 DEX 和 TGFβ2 做出反应。 Ad5.GFP 在 100 MOI 时具有最高的转导效率。 Ad5.Cre 和 Ad5.TGFβ2 敲低 Bambi 会增加培养物和组织中 TM 细胞中的纤连蛋白、胶原蛋白 1 和胶原蛋白 4。 Ad5.Cre、Ad5.TGFβ2和Ad5.TGFβ2+Ad5.Cre各自显着诱发转导眼中的高眼压并降低房水流出能力。据我们所知,我们首次证明 Bambi 的敲低会改变培养细胞和小鼠 TM 中的 ECM 表达,减少流出能力,并导致高眼压。这些数据为青光眼 TM 损伤的发展提供了新的见解,并确定 BAMBI 是 TM ECM 和高眼压症的重要调节剂。
The trabecular meshwork (TM) has an important role in the regulation of aqueous humor outflow and IOP. Regulation of the extracellular matrix (ECM) by TGFβ2 has been studied extensively. Bone morphogenetic protein (BMP) and activin membrane-bound inhibitor (BAMBI) has been shown to inhibit or modulate TGFβ2 signaling. We investigate the role of TGFβ2 and BAMBI in the regulation of TM ECM and ocular hypertension. Mouse TM (MTM) cells were isolated from B6;129S1-Bambitm1Jian/J flox mice, characterized for TGFβ2 and dexamethasone (DEX)–induced expression of fibronectin, collagen-1, collagen-4, laminin, α-smooth muscle actin, cross-linked actin networks (CLANs) formation, and DEX-induced myocilin (MYOC) expression. MTM cells were transduced with Ad5.GFP to identify transduction efficiency. MTM cells and mouse eyes were transduced with Ad5.Null, Ad5.Cre, Ad5.TGFβ2, or Ad5.TGFβ2 + Ad5.Cre to evaluate the effect on ECM production, IOP, and outflow facility. MTM cells express TM markers and respond to DEX and TGFβ2. Ad5.GFP at 100 MOI had the highest transduction efficiency. Bambi knockdown by Ad5.Cre and Ad5.TGFβ2 increased fibronectin, collagen-1, and collagen-4 in TM cells in culture and tissue. Ad5.Cre, Ad5.TGFβ2, and Ad5.TGFβ2 + Ad5.Cre each significantly induced ocular hypertension and lowered aqueous humor outflow facility in transduced eyes. We show for the first time to our knowledge that knockdown of Bambi alters ECM expression in cultured cells and mouse TM, reduces outflow facility, and causes ocular hypertension. These data provide a novel insight into the development of glaucomatous TM damage and identify BAMBI as an important regulator of TM ECM and ocular hypertension.
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