Journal
ONCOGENE
Volume 28, Issue 29, Pages 2621-2633Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/onc.2009.129
Keywords
adiponectin; LKB1; invasion; migration; breast cancer
Funding
- NCI NIH HHS [R01 CA131294, 5P01CA116676-030002, R01CA131294] Funding Source: Medline
- NIDDK NIH HHS [R03 DK089130-02, K01 DK077137, R03 DK089130, K01 DK077137-01A1, K01 DK076742, K01DK076742, K01 DK077137-04, K01 DK077137-05, R03 DK089130-03, K01 DK077137-02] Funding Source: Medline
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Adiponectin is widely known as an adipocytokine with therapeutic potential for its markedly protective function in the pathogenesis of obesity-related disorders, metabolic syndrome, systemic insulin resistance, cardiovascular disease and more recently carcinogenesis. In the present study, we show that adiponectin inhibits adhesion, invasion and migration of breast cancer cells. Further analysis of the underlying molecular mechanisms revealed that adiponectin treatment increased AMP-activated protein kinase (AMPK) phosphorylation and activity as evident by increased phosphorylation of downstream target of AMPK, acetyl-coenzyme A carboxylase and inhibition of p70S6 kinase (S6K). Intriguingly, we discovered that adiponectin treatment increases the expression of tumor suppressor gene LKB1 in breast cancer cells. Overexpression of LKB1 in breast cancer cells further increased adiponectin-mediated phosphorylation of AMPK. Using isogenic LKB1 knockdown cell line pair, we found that LKB1 is required for adiponectin-mediated modulation of AMPK -S6K axis and more importantly, inhibition of adhesion, migration and invasion of breast cancer cells. Taken together these data present a novel mechanism involving specific upregulation of tumor suppressor gene LKB1 by which adiponectin inhibits adhesion, invasion and migration of breast cancer cells. Our findings indicate the possibility of using adiponectin analogues to inhibit invasion and migration of breast cancer cells. Oncogene (2009) 28, 2621 -2633; doi: 10.1038/onc.2009.129; published online 1 June 2009
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