Induction of osteopontin gene expression during mammary gland involution and effects of glucocorticoid on its expression in mammary epithelial cells.
To understand the molecular mechanisms of mammary gland involution, an involution-induced clone was identified from a cDNA library of mouse mammary gland by differential screening. Characterization of a clone by sequencing and northern analysis showed that expression of the osteopontin gene was induced during involution of mouse mammary gland. But induction of the osteopontin gene was not observed in apoptotic HC11 mammary epithelial cells under serum starvation. In HC11 cells, dexamethasone treatment from the seeding stage showed five-fold induction of osteopontin gene expression, but the expression was not changed when dexamethasone was added to confluent cells.
Lee
M
M
Department of Genetic Engineering, Biotechnology Research Institute, College of Agriculture, Chonnam National University, Kwangju, Korea.
Na
S
S
Jeon
D
D
Kim
H
H
Choi
Y
Y
Baik
M
M
D000818:Animals; D017209:Apoptosis; D001940:Breast / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D003907:Dexamethasone / Q000494:pharmacology*; D004847:Epithelial Cells / Q000187:drug effects / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation; D051379:Mice; D053495:Osteopontin; D012795:Sialoglycoproteins / Q000235:genetics*
D012795:Sialoglycoproteins; C506896:Spp1 protein, mouse; D053495:Osteopontin; D003907:Dexamethasone