Oxidative stress disrupts internalization and endocytic trafficking of transferrin in a human malignant keratinocyte line

被引:19
作者
Cheng, Julia
Vieira, Amandio
机构
[1] Simon Fraser Univ, Fac Sci Appl, Endocrine & Metab Res Lab, Burnaby, BC V5A 1S6, Canada
[2] Simon Fraser Univ, Inst Hlth Res, IHRE, Burnaby, BC V5A 1S6, Canada
关键词
oxidative stress; hydrogen peroxide; transferrin; internalization; endocytic trafficking; epidermal carcinoma;
D O I
10.1385/CBB:45:2:177
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Oxidative stress is involved in epidermal cell pathology. One potential mechanism for this toxicity that has previously not been explored in epidermal cells involves modulation of endocytic trafficking and the implications that such modulation can have for altered cell function. The effects of oxidative stress on enclocytic trafficking are not well understood, particularly relating to how general or cell-type specific such effects may be. With induction of oxidative stress by hydrogen peroxide, for example, both impaired and enhanced cell-surface binding and endocytic trafficking have been reported for transferrin (Tf), a circulatory iron-carrier protein. The objective of the current study was to characterize the effect of oxidative stress on internalization and enclocytic trafficking of Tf in an epidermoid cell line (A431). Evidence is presented for a significant dose-dependent impairment of cellular Tf internalization after treatment with hydrogen peroxide over a wide range of concentrations from 0.06 to 5.8 mM. Scatchard analysis of binding revealed that peroxide treatments resulted in a large decrease, more than fourfold, in the number of cell-surface Tf-binding sites (Bmax) but little change in the dissociation constant (Kd). With respect to enclocytic trafficking of Tf, evidence is presented that transport of internalized transferrin back out of the cell (i.e., Tf recycling) is significantly impaired as a result of oxidative stress at all the peroxide concentrations tested. The oxidative stress-dependent changes in enclocytic trafficking in these malignant human keratinocytes are compared with those reported for other cell types.
引用
收藏
页码:177 / 184
页数:8
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