Abstract
High CD44 expression is associated with enhanced malignant potential in esophageal squamous cell carcinoma (ESCC), among the deadliest of all human carcinomas. Although alterations in autophagy and CD44 expression are associated with poor patient outcomes in various cancer types, the relationship between autophagy and cells with high CD44 expression remains incompletely understood. In transformed oesophageal keratinocytes, CD44Low-CD24High (CD44L) cells give rise to CD44High-CD24-/Low (CD44H) cells via epithelial-mesenchymal transition (EMT) in response to transforming growth factor (TGF)-β. We couple patient samples and xenotransplantation studies with this tractable in vitro system of CD44L to CD44H cell conversion to investigate the functional role of autophagy in generation of cells with high CD44 expression. We report that high expression of the autophagy marker cleaved LC3 expression correlates with poor clinical outcome in ESCC. In ESCC xenograft tumours, pharmacological autophagy inhibition with chloroquine derivatives depletes cells with high CD44 expression while promoting oxidative stress. Autophagic flux impairment during EMT-mediated CD44L to CD44H cell conversion in vitro induces mitochondrial dysfunction, oxidative stress and cell death. During CD44H cell generation, transformed keratinocytes display evidence of mitophagy, including mitochondrial fragmentation, decreased mitochondrial content and mitochondrial translocation of Parkin, essential in mitophagy. RNA interference-mediated Parkin depletion attenuates CD44H cell generation. These data suggest that autophagy facilitates EMT-mediated CD44H generation via modulation of redox homeostasis and Parkin-dependent mitochondrial clearance. This is the first report to implicate mitophagy in regulation of tumour cells with high CD44 expression, representing a potential novel therapeutic avenue in cancers where EMT and CD44H cells have been implicated, including ESCC.
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Abbreviations
- ATG:
-
autophagy-related
- AV(s):
-
autophagic vesicle(s)
- CD44H:
-
CD44High-CD24-/Low
- CD44L:
-
CD44Low-CD24High
- CD44s:
-
standard isoform of CD44
- CD44T:
-
CD44High-CD24High
- CD44v:
-
variant isoforms of CD44
- CQ:
-
Chloroquine
- DAPI:
-
4',6-diamidino-2-phenylindole
- DCF:
-
2′7′-dichlorodihydrofluorescein diacetate
- DPBS:
-
Dulbecco’s Phosphate-buffered Saline
- EMT:
-
epithelial-mesenchymal transition
- EPC2T:
-
EPC2-hTERT-EGFR-p53R175H-CyclinD1
- ESCC:
-
esophageal squamous cell carcinoma
- ESRP:
-
epithelial splicing regulatory protein
- FACS:
-
fluorescence-activated cell sorting
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- HCQ:
-
Hydroxychloroquine
- IHC:
-
Immunohistochemistry
- KSFM:
-
keratinocyte-serum free medium
- LC3:
-
microtubule-associated protein 1 light chain 3
- Mdivi-1:
-
mitochondria division inhibitor-1
- MTCO1:
-
Mitochondrial encoded Cytochrome Oxidase I
- mtDNA:
-
mitochondrial DNA
- O2−:
-
superoxide
- OKF6T:
-
OKF6-hTERT-EGFR-p53R175H
- p-H2A.XSer139:
-
phospho-Histone H2A.X Serine139
- PCR:
-
polymerase chain reaction
- ROS:
-
reactive oxygen species
- RT:
-
Reverse-transcription
- sd:
-
standard deviation
- sem:
-
standard error of the mean
- SOD:
-
superoxide dismutase
- TEM:
-
transmission electron microscopy
- TGF:
-
transforming growth factor
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Acknowledgements
We appreciate the support the support of members the Nakagawa and Rustgi laboratories for thoughtful discussions and support. We thank Ben Rhodes, Sanders Chang, Andy Guo, Amanda B. Muir, MD and Ashley Lento, PhD for technical support. We acknowledge the Flow Cytometry and Cell Sorting Resource Laboratory, the Electron Microscopy Resource Laboratory, and the Cell and Developmental Biology Microscopy Core at the University of Pennsylvania. This study was supported by the following NIH Grants: P01CA098101 (KAW, KT, PMC, AJK-S, HN, AKR), K26RR032714 (HN), P30ES013508 University of Pennsylvania Center of Excellence in Environmental Toxicology (HN), K01DK103953 (KAW), F32CA174176 (KAW), T32DK007066 (KAW), the American Cancer Society RP-10-033-01-CCE (AKR), NIH/NIDDK P30DK050306 Center of Molecular Studies in Digestive and Liver Diseases, The Molecular Pathology and Imaging, Molecular Biology/Gene Expression, Cell Culture and Mouse Core Facilities. Additional support was provided by the Pennsylvania Department of Health, Pennsylvania CURE Program Grant (HN). KT is a recipient of the Japan Society for the Promotion of Science Postdoctoral Fellowship. His study was supported by the Grant-in-Aid for challenging Exploratory Research, Grant in Aid for Scientific Research B and Grant in Aid for Scientific Research C from the Ministry of Education, Culture, Sports, Science and Technology of Japan (15K15501 and 26293306 to SN; and 15K10108 to YK).
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The authors declare no conflict of interest. Drs Ravi K Amaravadi and Jeffrey D Winkler have licensed Lys05 to Presage biosciences for development. The other authors declare no conflict of interest.
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Whelan, K., Chandramouleeswaran, P., Tanaka, K. et al. Autophagy supports generation of cells with high CD44 expression via modulation of oxidative stress and Parkin-mediated mitochondrial clearance. Oncogene 36, 4843–4858 (2017). https://doi.org/10.1038/onc.2017.102
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DOI: https://doi.org/10.1038/onc.2017.102
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