Premium
Contextual role of E2F1 in suppression of melanoma cell motility and invasiveness
Author(s) -
Meng Peng,
Bedolla Roble G.,
Yun Huiyoung,
Fitzpatrick James E.,
Kumar Addanki P.,
Ghosh Rita
Publication year - 2019
Publication title -
molecular carcinogenesis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.254
H-Index - 97
eISSN - 1098-2744
pISSN - 0899-1987
DOI - 10.1002/mc.23043
Subject(s) - e2f1 , cancer research , biology , melanoma , mapk/erk pathway , v600e , cancer , kinase , mutation , cell cycle , microbiology and biotechnology , genetics , gene
Abstract The general transcription factor E2F1 reportedly functions in a protumorigenic manner in several cancer models. We show that the genetic context of cancer cells influence E2F1's role to impede the protumorigenic role. Thirty to fifty percent of melanoma patients carry mutant BRAF with about 90% of mutant BRAF melanomas being V 600E mutation. Tissue microarrays from melanoma patients were used to establish an association between E2F1 and BRAF V600E . We show for the first time that low E2F1 levels in BRAF V600E melanomas are associated with lymph node metastasis. Genetic manipulation of E2F1 in BRAF V600E and BRAF wt cells were used to determine its role in malignant melanoma progression by examining effects on migration and invasion. E2F1‐mediated negative regulation of myosin light chain kinase (MYLK) increased migration and invasion in BRAF V600E cells by phosphorylating myosin light chain and increased stress fiber formation. We show that E2F1 inhibits extracellular signal‐regulated kinase (ERK) activation in BRAF V600E cells and provide evidence for a negative feedback loop between E2F1 and ERK in these cells. This study shows for the first time that E2F1 has a cancer protective role in oncogenic BRAF‐activated melanoma cells and that loss of E2F1 can allow disease progression through a novel mechanism of E2F1‐mediated MYLK regulation. This study has implications for oncogenic BRAF‐activated tumors and resistance to targeted oncogenic BRAF therapy.