Acquisition of type IX collagen by the developing avian primary corneal stroma and vitreous.

Acquisition of type IX collagen by the developing avian primary corneal stroma and vitreous.
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发育中的禽类初级角膜基质和玻璃体获得 IX 型胶原蛋白。

DOI:
10.1016/0012-1606(88)90301-6
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发表时间:
1988
影响因子:
2.7
通讯作者:
Linsenmayer,TF
Linsenmayer,TF
中科院分区:
生物学3区
文献类型:
--
作者:
Fitch,JM;Mentzer,A;Mayne,R;Linsenmayer,TF

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我们实验室和其他实验室以前的研究表明,II型胶原蛋白,曾经被认为是软骨特异性分子,也是原代角膜基质和胚胎鸡玻璃体的组成部分。在目前的免疫组织化学研究中,我们检查了另一种“软骨特异性”胶原蛋白(IX型和II型)在这些胚胎基质中的表达,沿着。在角膜中,IX型胶原蛋白存在于初级基质中,但在成熟的次级基质中检测不到。即使在原代基质中,这种胶原蛋白也有短暂的存在。当内皮细胞开始沿着沿着其后表面迁移时,它首先出现在外周基质中,并在随后的24-36小时内遍布基质。然后,在基质膨胀并被眼周间充质细胞(未来的角膜细胞)占据之前,IX型胶原上的表位突然变得不可检测。相比之下,II型胶原蛋白(沿着I型胶原蛋白)在这些事件发生之前和之后很长一段时间都存在于基质中。因此,在发育中的角膜基质中沉积的免疫可检测的IX型胶原蛋白似乎与II型胶原蛋白无关。在玻璃体中,我们观察到IX型胶原沿着II型胶原,只要可以鉴定出真正的玻璃体,并在所有后续的发展阶段。因此,在该组织中,IX型和II型胶原蛋白的表达似乎是协调的。
Previous investigations from our laboratory and others have demonstrated that type II collagen, once thought to be a cartilage-specific molecule, is also a component of both the primary corneal stroma and the vitreous of embryonic chickens. In the present immunohistochemical study we have examined the expression in these embryonic matrices of another “cartilage-specific” collagen, type IX, along with type II. In the cornea, type IX collagen is in the primary stroma, but is not detectable in the mature, secondary stroma. Even within the primary stroma this collagen has a brief, transitory existence. It first appears in the peripheral stroma at the time the endothelial cells begin to migrate along its posterior surface, and spreads throughout the stroma during the following 24–36 hr. The epitopes on type IX collagen then suddenly become undetectable just before this matrix swells and becomes populated by the periocular mesenchymal cells (future keratocytes). In comparison, collagen type II (along with type I) is present in the stroma before and long after these events. Deposition of immunodetectable type IX collagen in the developing corneal stroma thus seems to be independent of type II. In the vitreous, we observed type IX collagen along with type II as soon as authentic vitreous could be identified and at all subsequent stages of development. In this tissue, therefore, the expression of collagen types IX and II appears to be coordinate.
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