Abstract:
:Differences in insulin-like growth factor binding proteins (IGFBPs) expressed within estrogen receptor positive (ER+, MCF-7/6) and negative (ER-, MDA-MB-231) human breast cancer cells cultured in chemically defined medium were observed. In the absence of insulin, 17 beta-estradiol affects this expression in ER+ cells by significantly reducing 34 and 28 kDa species. In ER+ cells, insulin appears to minimize the estrogen induced reduction of these 34 and 28 kDa IGFBPs and stimulates a 24 kDa type. We suggest that through its association with a given IGFBP, insulin-like growth factor-II (IGF-II) directs lysosomal enzymes to secretion by its binding to the mannose-6-phosphate/IGF-II receptors present in the Golgi apparatus. Alternatively, the association of IGF-II with another IGFBP would inhibit this binding and lead to its autocrine or intracrine mitogenic action via the IGF-I receptor.
journal_name
Biochem Biophys Res Communjournal_title
Biochemical and biophysical research communicationsauthors
Dubois V,Couissi D,Schonne E,Schneider YJ,Remacle C,Trouet Adoi
10.1006/bbrc.1993.1413subject
Has Abstractpub_date
1993-04-15 00:00:00pages
295-301issue
1eissn
0006-291Xissn
1090-2104pii
S0006-291X(83)71413-0journal_volume
192pub_type
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
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更新日期:2001-06-15 00:00:00
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journal_title:Biochemical and biophysical research communications
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journal_title:Biochemical and biophysical research communications
pub_type: 杂志文章
doi:10.1016/j.bbrc.2004.07.100
更新日期:2004-09-10 00:00:00