Abstract：
:One of the most prevalent of cancers, breast cancer, is characterized by hormonal control of its growth. Expression of the estrogen receptor (ER) in MCF-7 breast cancer cells appears to be a complex process involving multiple steps subject to hormonal regulation by estrogen. Treatment of MCF-7 cells with estradiol results in the suppression of estrogen receptor protein. By 6 hours, the receptor protein declined by about 60% from a level of approximately 3.6 to 1.2 fmol/micrograms DNA and remained suppressed for 24-48 hours. Similar results were obtained with an estrogen receptor binding assay. Estrogen treatment also resulted in a decrease of receptor mRNA to approximately 10% of control values by 6 hours. Estrogen receptor remained at the suppressed level for up to 48 hours. Transcription run-on experiments demonstrated a transient decrease of about 90% in receptor gene transcription after 1 hour. By 3-6 hours transcription increased approximately 2-fold and remained elevated for at least 48 hours. These data suggest that estrogen suppresses ER mRNA by inhibition of ER gene transcription at early times and by a post-transcriptional effect on receptor mRNA at later times. To determine whether post-transcriptional regulation of ER gene expression is mediated by an ER-dependent mechanism independent of protein synthesis, we used the competitive estrogen antagonist, 4-hydroxytamoxifen, and the inhibitor of protein synthesis, cycloheximide, to study the regulation of ER mRNA by estradiol. 4-Hydroxytamoxifen had no effect on the steady-state level of receptor mRNA and effectively blocked the suppression of ER mRNA by estradiol. The metabolic inhibitor, cycloheximide, was unable to prevent the estrogen induced decrease in ER mRNA. These data provide evidence that the post-transcriptional suppression of ER expression through estradiol is mediated through the ER independent of protein synthesis.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Martin MB,Saceda M,Lindsey RKdoi
10.1007/978-1-4615-2926-2_11subject
Has Abstractpub_date
1993-01-01 00:00:00pages
143-53eissn
0065-2598issn
2214-8019journal_volume
330pub_type
杂志文章abstract：:Photoprotective mechanisms have been evolved by photosynthetic organisms to cope with fluctuating high light conditions. One of these mechanisms downregulates photosynthesis by increasing thermal dissipation of the energy absorbed by the photosystem II antenna. While this process has been well studied in plants, the e...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4419-1528-3_9
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journal_title：Advances in experimental medicine and biology
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journal_title：Advances in experimental medicine and biology
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journal_title：Advances in experimental medicine and biology
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journal_title：Advances in experimental medicine and biology
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更新日期：1984-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：1979-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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pub_type： 杂志文章
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更新日期：2013-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
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更新日期：2003-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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doi：10.1007/978-1-4939-2981-8_53
更新日期：2016-01-01 00:00:00
abstract：:This chapter summarized the taxonomy and typing works of Yersinia pestis since it's firstly identified in Hong Kong in 1894. Phenotyping methods that based on phenotypic characteristics, including biotyping, serotyping, antibiogram analysis, bacteriocin typing, phage typing, and plasmid typing, were firstly applied in...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-94-024-0890-4_3
更新日期：2016-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4615-5331-1_43
更新日期：1998-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-3-319-55231-6_51
更新日期：2017-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-3-319-71779-1_15
更新日期：2018-01-01 00:00:00
abstract：:Organisms are subject to random changes in their external environments, as well as in their internal components. A central goal of evolutionary systems biology is to understand how living systems cope with-and in some cases exploit-this variation. Many cellular and developmental processes operate with high fidelity to...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4614-3567-9_20
更新日期：2012-01-01 00:00:00
abstract：:Genetic variants of high-temperature requirement A serine peptidase 1 (HTRA1) and age-related maculopathy susceptibility 2 (ARMS2) are associated with age-related macular degeneration (AMD). One HTRA1 single nucleotide polymorphism (SNP) is situated in the promotor region (rs11200638) resulting in increased expression...
journal_title：Advances in experimental medicine and biology
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journal_title：Advances in experimental medicine and biology
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
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更新日期：2013-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：2018-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：1998-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：2020-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
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更新日期：2012-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：2020-01-01 00:00:00
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journal_title：Advances in experimental medicine and biology
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更新日期：1993-01-01 00:00:00
abstract：:Tumors derived from the colonic epithelium exhibit cholesterol metabolism which is clearly different from that in fibroblasts, hepatocytes, adrenals, and ovaries. In hepatocytes and fibroblasts MEV inhibition of the rate limiting step in cholesterol synthesis HMG Co A reductase can be overcome by the uptake of LDL. Co...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4613-0399-2_9
更新日期：1996-01-01 00:00:00
abstract：:Cyclic GMP phosphodiesterase (PDE6) is a key enzyme in vertebrate retinal phototransduction. After GTP/GDP exchange on the a subunit of transducin (Talpha) by illuminated rhodopsin, the GTP-bound form Talpha (GTP/Talpha) interacts with the regulatory subunit (Pgamma) of PDE6 to activate cGMP hydrolytic activity. The r...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章,评审
doi：10.1007/978-1-4615-0121-3_9
更新日期：2002-01-01 00:00:00
abstract：:Thermomechanical Analysis (TMA), using the parallel-plate-rheometer mode of the DuPont 943 TMA, was used to evaluate the softening properties of frozen aqueous carbohydrate model systems. A sample (of fixed dimension) of frozen solution was placed between the parallel plates and cooled to -80 degrees C. The sample was...
journal_title：Advances in experimental medicine and biology
pub_type： 杂志文章
doi：10.1007/978-1-4899-0664-9_11
更新日期：1991-01-01 00:00:00
