Abstract:
:The major glycoproteins synthesized by human breast epithelial cells have been characterized [6,8]. The most consistently observed and prominent component in supernatants of organ cultures of breast surgical specimens and of MCF-7 cells was gp 68 which has been immunologically identified as alpha-1-antichymotrypsin (Achy). In the present study we demonstrate that this glycoprotein can form an irreversible complex with chymotrypsin, which indicates that it is a functional inhibitor. The 14C-glucosamine-labeled gp 68 forms a stable, 88,000-dalton, enzyme-inhibitor complex with chymotrypsin. The molecule is secreted continuously for 9 days into a chemically defined, serum-free medium. In addition to the de novo synthesized inhibitor, another component is absorbed from fetal bovine serum and subsequently released into serum-free medium. This component also forms an irreversible, 88,000-dalton complex with enzyme. The observations establish that two types of inhibitors are associated with human breast epithelial cells, one actively synthesized and the other derived from serum. Both of these molecules may have significant roles in stabilizing cell surface components and in protecting extracellular matrices from untimely degradation.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Gendler SJ,Tökés ZAdoi
10.1002/jcb.240260304subject
Has Abstractpub_date
1984-01-01 00:00:00pages
157-67issue
3eissn
0730-2312issn
1097-4644journal_volume
26pub_type
杂志文章abstract::Estrogen and androgen are both critical for the maintenance of bone, but the target cells, mechanisms, and responses could be sex-specific. To compare sex-specific actions of estrogen and androgen on osteoclasts, human peripheral blood mononuclear precursor cells from adult Caucasian males (n = 3) and females (n = 3) ...
journal_title:Journal of cellular biochemistry
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