Abstract
Since being introduced globally as aspirin in 1899, acetylsalicylic acid has been widely used as an analgesic, anti-inflammation, anti-pyretic, and anti-thrombotic drug for years. Aspirin had been reported to down-regulate surface expression of CD40, CD80, CD86, and MHCII in myeloid dendritic cells (DC), which played essential roles in regulating the immune system. We hypothesized that the down-regulation of these surface membrane proteins is partly due to the ability of aspirin in regulating trafficking/sorting of endocytosed surface membrane proteins. By using an established epidermoid carcinoma cell line (A-431), which overexpresses the epidermal growth factor receptor (EGFR) and transferrin receptor (TfnR), we show that aspirin (1) reduces cell surface expression of EGFR and (2) accumulates endocytosed-EGFR and -TfnR in the early/sorting endosome (ESE). Further elucidation of the mechanism suggests that aspirin enhances recruitment of SNX3 and SNX5 to membranes and consistently, both SNX3 and SNX5 play essential roles in the aspirin-mediated accumulation of endocytosed-TfnR at the ESE. This study sheds light on how aspirin may down-regulate surface expression of EGFR by inhibiting/delaying the exit of endocytosed-EGFR from the ESE and recycling of endocytosed-EGFR back to the cell surface.
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Abbreviations
- EGFR:
-
Epidermal growth factor receptor
- TfnR:
-
Transferrin receptor
- EE:
-
Early endosome
- ESE:
-
Early/Sorting endosomes
- RE:
-
Recycling endosome
- LE:
-
Late endosome
- SNX:
-
Sorting nexin
- AMC:
-
Aspirin-induced membrane compartment
- NRAMP2:
-
Natural resistance-associated macrophage protein 2
- CysLT1 :
-
Cysteinyl leukotriene receptor
- SR-BI:
-
Scavenger receptor class B type I
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Acknowledgments
We would like to thank Dr. Boon Chuan Low for reading the manuscript and his valuable comments. This work was supported by research grants from the Academic Research Council-Ministry of Education, Singapore (R182-000-099-112 to S.H.W) and the Singapore National Medical Research Council (R182-000-137-213 to S.H.W).
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18_2011_887_MOESM1_ESM.tif
Supplementary material 1 (TIFF 895 kb) Supplementary Fig. 1 The aspirin-mediated accumulation of endocytosed cell surface receptors in the ESE is also regulated by the MAPK pathway. (A) Cell extracts from untreated and aspirin-treated A-431 cells were analyzed by Western-blot analysis using antibodies specific for the phosphorylated forms of p38 MAPK, JNK, and ERK. Results are representative of three independent experiments. (B) Surface antibody-TfnR complexes were allowed to be internalized into cells in the absence or presence of aspirin and p38 inhibitor with concentration and duration as indicated. Image, fluorescence microscope; magnification, 100x; white arrow, the compact structure is the ESE/AMC; red arrow, reduced accumulation of eTfnR in the ESE/AMC in the presence of inhibitors and aspirin. Results are representative of at least two independent experiments. (C) Surface antibody-TfnR complexes were allowed to be internalized into A-431 cells in the presence of 10 mM aspirin for 3 h (a) and followed by treatment with 10 mM aspirin (b, j); normal complete media (f, n); aspirin and p38 inhibitor (c, k); aspirin and ERK inhibitor (d, l); aspirin and JNK inhibitor (e, m); p38 inhibitor (g, o); ERK inhibitor (h, p); and JNK inhibitor (l, q) at indicated time points. Image of fluorescence microscope; magnification, 100x; white arrow, the compact structure is the ESE/AMC; red arrow, reduced accumulation of eTfnR in the ESE/AMC in the presence of inhibitors and aspirin; yellow arrow, reduced accumulation of eTfnR in the ESE/AMC upon removal of aspirin and in the presence of inhibitors; purple arrow, reduced accumulation of eTfnR in the ESE/AMC upon removal of aspirin.
18_2011_887_MOESM2_ESM.tif
Supplementary material 2 (TIFF 61 kb) Supplementary Fig. 2 Aspirin inhibits A-431 cell proliferation. A-431 was treated with indicated concentrations of aspirin for 48 h. Cells were subjected to MTT and the number of viable cells in each sample was normalized to untreated sample. Points, average of normalized values from three independent experiments; bars, ±SD.
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Chiow, K.H., Tan, Y., Chua, R.Y. et al. SNX3-dependent regulation of epidermal growth factor receptor (EGFR) trafficking and degradation by aspirin in epidermoid carcinoma (A-431) cells. Cell. Mol. Life Sci. 69, 1505–1521 (2012). https://doi.org/10.1007/s00018-011-0887-z
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DOI: https://doi.org/10.1007/s00018-011-0887-z