Journal
NATURE
Volume 458, Issue 7239, Pages 725-U61Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/nature07782
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Funding
- Alexander and Margaret Stewart Trust Award
- David H. Koch Cancer Research Award
- National Institutes of Health [R01 AI04389, R01 CA129105]
- Howard Hughes Medical Institute
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Dietary restriction delays the incidence and decreases the growth of various types of tumours, but the mechanisms underlying the sensitivity of tumours to food restriction remain unknown. Here we show that certain human cancer cell lines, when grown as tumour xenografts in mice, are highly sensitive to the anti-growth effects of dietary restriction, whereas others are resistant. Cancer cells that form dietary-restriction-resistant tumours carry mutations that cause constitutive activation of the phosphatidylinositol-3-kinase (PI3K) pathway and in culture proliferate in the absence of insulin or insulin-like growth factor 1. Substitution of an activated mutant allele of PI3K with wild-type PI3K in otherwise isogenic cancer cells, or the restoration of PTEN expression in a PTEN-null cancer cell line, is sufficient to convert a dietary-restriction-resistant tumour into one that is dietary-restriction-sensitive. Dietary restriction does not affect a PTEN-null mouse model of prostate cancer, but it significantly decreases tumour burden in a mouse model of lung cancer lacking constitutive PI3K signalling. Thus, the PI3K pathway is an important determinant of the sensitivity of tumours to dietary restriction, and activating mutations in the pathway may influence the response of cancers to dietary restriction-mimetic therapies.
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