Polyamines in cultured rabbit corneal cells.

Polyamines in cultured rabbit corneal cells.
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培养的兔角膜细胞中的多胺。

DOI:
10.1167/iovs.02-0889
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发表时间:
2003
影响因子:
4.4
通讯作者:
Watsky,MitchellA
Watsky,MitchellA
中科院分区:
医学2区
文献类型:
--
作者:
Du,Haiming;Viar,MaryJane;Johnson,LeonardR;Watsky,MitchellA

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目的。为了确定角膜细胞中是否存在多胺,是否可以通过阻断多胺合成途径中的第一限速酶鸟氨酸脱羧酶(ODC)来耗尽角膜细胞中的多胺,以及在所有三种角膜细胞类型中,多胺是否是增殖所必需的。将培养的角膜上皮细胞、角化细胞和内皮细胞暴露于特定的ODC阻滞剂二氟甲基鸟氨酸(DFMO)中,测量ODC活性、细胞内多胺浓度和细胞增殖。在所有三种细胞类型中,DFMO以剂量和时间依赖的方式阻断ODC活性。DFMO处理在2天内完全减少了腐胺和亚精胺,也显著减少了精胺。DFMO处理还能抑制所有三种细胞类型的细胞生长,并且在培养基中添加外源性腐胺可以完全逆转这种抑制。多胺存在于所有类型的角膜细胞中,其形成至少部分是由ODC催化的,是角膜细胞增殖的重要组成部分。
purpose. To determine whether polyamines are present in corneal cells, whether corneal cell polyamines can be depleted by blocking the first rate-limiting enzyme in the polyamine synthesis pathway, ornithine decarboxylase (ODC), and whether polyamines are required for proliferation in all three corneal cell types.methods. Cultured corneal epithelial cells, keratocytes, and endothelial cells were exposed to the specific ODC blocker difluoromethylornithine (DFMO), and ODC activity, intracellular polyamine concentrations, and cell proliferation were measured.results. DFMO blocked ODC activity in a dose-and time-dependent manner in all three cell types. DFMO treatment completely depleted putrescine and spermidine by 2 days and also significantly depleted spermine. DFMO treatment also inhibited cell growth in all three cell types and this inhibition could be completely reversed by adding exogenous putrescine to the culture medium.conclusions. Polyamines are present in all cell types of the cornea, their formation is catalyzed at least in part by ODC, and they are an important component of corneal cell proliferation.
DOI: --
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影响因子: 4.4
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