[PDF][PDF] LKB1/STK11 inactivation leads to expansion of a prometastatic tumor subpopulation in melanoma
W Liu, KB Monahan, AD Pfefferle, T Shimamura… - Cancer cell, 2012 - cell.com
Cancer cell, 2012•cell.com
Germline mutations in LKB1 (STK11) are associated with the Peutz-Jeghers syndrome
(PJS), which includes aberrant mucocutaneous pigmentation, and somatic LKB1 mutations
occur in 10% of cutaneous melanoma. By somatically inactivating Lkb1 with K-Ras
activation (±p53 loss) in murine melanocytes, we observed variably pigmented and highly
metastatic melanoma with 100% penetrance. LKB1 deficiency resulted in increased
phosphorylation of the SRC family kinase (SFK) YES, increased expression of WNT target …
(PJS), which includes aberrant mucocutaneous pigmentation, and somatic LKB1 mutations
occur in 10% of cutaneous melanoma. By somatically inactivating Lkb1 with K-Ras
activation (±p53 loss) in murine melanocytes, we observed variably pigmented and highly
metastatic melanoma with 100% penetrance. LKB1 deficiency resulted in increased
phosphorylation of the SRC family kinase (SFK) YES, increased expression of WNT target …
Summary
Germline mutations in LKB1 (STK11) are associated with the Peutz-Jeghers syndrome (PJS), which includes aberrant mucocutaneous pigmentation, and somatic LKB1 mutations occur in 10% of cutaneous melanoma. By somatically inactivating Lkb1 with K-Ras activation (±p53 loss) in murine melanocytes, we observed variably pigmented and highly metastatic melanoma with 100% penetrance. LKB1 deficiency resulted in increased phosphorylation of the SRC family kinase (SFK) YES, increased expression of WNT target genes, and expansion of a CD24+ cell population, which showed increased metastatic behavior in vitro and in vivo relative to isogenic CD24− cells. These results suggest that LKB1 inactivation in the context of RAS activation facilitates metastasis by inducing an SFK-dependent expansion of a prometastatic, CD24+ tumor subpopulation.
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