Genistein induces glucose-regulated protein 78 in mammary tumor cells.
Preliminary studies have shown that genistein modulates the expression of some heat shock proteins in mammary tumor cells. In this study, we investigated the effect of genistein pretreatment on the expression of glucose-regulated protein 78 (GRP78) in both estrogen receptor-positive (MCF-7) and -negative (MDA-MB-231) cells. Genistein increased the expression of GRP78 in a dose- and time-dependent manner and suppressed glucose uptake in both cell lines. However, induction of GRP78 by genistein appears not to be directly associated with inhibition of glucose uptake. Genistein treatment also made MDA-MB-231 cells more sensitive to doxorubicin, probably via increased GRP78 expression, but had no effect or even decreased drug sensitivity in MCF-7 cells. These results suggest that genistein may be exploited as an enhancer of chemotherapeutic agents in certain types of breast cancer.
Department of Animal Science and Biotechnology, Kyungpook National University, Daegu, Korea.
Hyun Ae
HA
Lim
Jang Hoon
JH
Kim
Jung Hyun
JH
Kim
Mi-Kyung
MK
Sung
Mi Kyung
MK
Kim
Jung Han Yoon
JH
Park
Jong-Sang
JS
Kim
D001943:Breast Neoplasms / Q000737:chemistry / Q000378:metabolism*; D045744:Cell Line, Tumor; D004305:Dose-Response Relationship, Drug; D000091342:Endoplasmic Reticulum Chaperone BiP; D019833:Genistein / Q000494:pharmacology*; D005947:Glucose / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000032:analysis / Q000096:biosynthesis*; D006801:Humans; D007700:Kinetics; D018832:Molecular Chaperones / Q000032:analysis / Q000096:biosynthesis*; D011960:Receptors, Estrogen / Q000032:analysis
D000091342:Endoplasmic Reticulum Chaperone BiP; C000717247:HSPA5 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D011960:Receptors, Estrogen; D019833:Genistein; D005947:Glucose