Metabolic history impacts mammary tumor epithelial hierarchy and early drug response in mice. Issue 9 (September 2016)

• Record Type: Journal Article
• Authors: Montales, Maria Theresa E; Melnyk, Stepan B; Liu, Shi J; Simmen, Frank A; Liu, Y Lucy; Simmen, Rosalia C M
• Is Part Of: Endocrine-related cancer. Volume 23:Issue 9(2016)
• Page Start: 677
• Page End: 690
• Publication Date: 2016-09
• Subjects: breast cancer -- doxorubicin -- high-fat diet -- kynurenine metabolite -- stem cells; Endocrine glands -- Cancer -- Periodicals; Endocrinology -- Periodicals; Cancer -- Endocrine aspects -- Periodicals; 616.9944005
• DOI: 10.1530/ERC-16-0136
• Languages: English
• ISSNs: 1351-0088

Abstract

Abstract : The emerging links between breast cancer and metabolic dysfunctions brought forth by the obesity pandemic predict a disproportionate early disease onset in successive generations. Moreover, sensitivity to chemotherapeutic agents may be influenced by the patient's metabolic status that affects the disease outcome. Maternal metabolic stress as a determinant of drug response in progeny is not well defined. Here, we evaluated mammary tumor response to doxorubicin in female mouse mammary tumor virus–Wnt1 transgenic offspring exposed to a metabolically compromised environment imposed by maternal high-fat diet. Control progeny were from dams consuming diets with regular fat content. Maternal high-fat diet exposure increased tumor incidence and reduced tumor latency but did not affect tumor volume response to doxorubicin, compared with control diet exposure. However, doxorubicin-treated tumors from high-fat-diet-exposed offspring demonstrated higher proliferation status (Ki-67), mammary stem cell-associated gene expression ( Notch1, Aldh1 ) and basal stem cell-like (CD29 hi CD24 + ) epithelial subpopulation frequencies, than tumors from control diet progeny. Notably, all epithelial subpopulations (CD29 hi CD24 +, CD29 lo CD24 +, CD29 hi CD24 + Thy1 + ) in tumors from high-fat-diet-exposed offspring were refractory to doxorubicin. Further, sera from high-fat-diet-exposed offspring promoted sphere formation of mouse mammary tumor epithelial cells and of human MCF7 cells. Untargeted metabolomics analyses identified higher levels of kynurenine and 2-hydroxyglutarate in plasma of high-fat diet than control diet offspring. Kynurenine/doxorubicin co-treatment of MCF7 cells enhanced the ability to form mammosphere and decreased apoptosis, relative to doxorubicin-only-treated cells. Maternal metabolic dysfunctions during pregnancy and lactation may be targeted to reduce breast cancer risk and improve early drug response in progeny, and may inform clinical management of disease.