Abstract:
:The priming action of estradiol and the antiestrogen tamoxifen (TMX) on progesterone receptor (PgR) synthesis has been investigated in the 7,12-dimethylbenz(a)anthracene-induced rat mammary tumor model testing different priming times. Rats received either TMX or estradiol benzoate (E2B) for 3 or 7 days. Tumors were assayed before and after treatment to investigate the changes produced by each treatment on estrogen receptor (ER) and PgR concentration. As expected, ER concentration decreased in each treatment group. PgR concentration increased after 3 days of either E2B or TMX administration, but decreased when treatment was prolonged to 7 days. These findings point out the time dependency of PgR induction in this tumor model, similarly to what was observed in other experimental and clinical conditions.
journal_name
Oncologyjournal_title
Oncologyauthors
Boccardo F,Cerruti G,De Menech R,Valenti G,Zanardi Sdoi
10.1159/000226488subject
Has Abstractpub_date
1987-01-01 00:00:00pages
248-52issue
4eissn
0030-2414issn
1423-0232journal_volume
44pub_type
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