Journal
MELANOMA RESEARCH
Volume 25, Issue 2, Pages 138-148Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/CMR.0000000000000144
Keywords
aldehyde dehydrogenase; chemotherapy; dacarbazine; diethylaminobenzaldehyde; disulfiram; melanoma; metastasis
Categories
Funding
- NIH [R01AR053765]
- VA Merit Review [BX000794]
- Academic Senate Grant from the University of California at San Francisco
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Cells with aldehyde dehydrogenase activity (ALDH+) are the most tumorigenic cells in many cancers, including melanoma, making ALDH a candidate therapeutic target. We examined the effects of chemical inhibition of ALDH1 on the response of human melanoma xenografts to chemotherapy and the effects of ALDH1A1 RNA silencing on melanoma growth and metastasis. Addition of ALDH1 inhibitors (e.g. diethylaminobenzaldehyde) to dacarbazine chemotherapy, not only reduced tumor growth in vivo, but also resulted in a significant decrease in the number of residual cells capable of tumorigenesis. shRNA depletion of ALDH1A1 in melanoma cells resulted not only in a significant delay in appearance of xenograft melanomas and reduction in growth, but also significantly decreased the number of metastases and metastatic burden after lateral tail vein injections in mice. In summary, ALDH1 inhibition in combinatorial therapy with dacarbazine reduced the number of residual tumorigenic cells post-therapy and ALDH1A1 depletion had marked inhibitory effects on both melanoma growth and metastasis. These findings suggest that ALDH1 inhibition may not only be able to provide a therapeutic advantage in melanoma treatment, but may also prevent rapid relapse after therapy, as residual tumorigenic cells are fewer and metastatic ability is diminished. Melanoma Res 25: 138-148 Copyright (C) 2015 Wolters Kluwer Health, Inc. All rights reserved.
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