Abstract：
:Two-thirds of patients who present with metastatic prostate cancer (PC) are dead within 5 years of diagnosis. The comparable survival rate for patients with localized disease is 100%, which clearly stresses the need for pursuing and developing bioassays that allow prediction of which localized cases are most likely to metastasize. The commonly assayed prostate specific antigen (PSA), while touted as a transformation biomarker, has recently proven to be problematic in the area of false positive diagnoses. It remains, however, a hallmark gene for studying androgen regulation as its expression is reliably stimulated by androgens such as dihydrotestosterone (DHT). Herein, we have elucidated the effects of flutamide (a defined anti-androgen) and DHT on the expression of PSA and Zinc finger E-box Binding factor (ZEB-1). Additionally, we assayed the androgenic capabilities of two DHT derivatives on expression of PSA. Our previous research had identified ZEB-1 as a putative biomarker for the onset of metastasis in prostate cancer. The expression of this gene is regulated by androgen and decreases sharply at metastasis. In the current study, the effects of 1 and 10 nM flutamide, in combination with 1 and 10 nM DHT, on expression of ZEB-1 and PSA, were investigated in 22Rv1, an androgen-responsive human PC cell line. Also in this cell line, the effects of testosterone propionate and dehydroisoandrosterone were studied. Our research confirmed the feasibility of considering ZEB-1 a metastatic PCa biomarker, using the highly sensitive technique of real-time polymerase chain reaction (RT-PCR). Interestingly, it also revealed the danger of using flutamide as a therapeutic antagonist, as we demonstrate herein its alarming capability to behave as an agonist.
journal_name
Adv Exp Med Bioljournal_title
Advances in experimental medicine and biologyauthors
Anose BM,LaGoo L,Schwendinger Jdoi
10.1007/978-0-387-69080-3_55subject
Has Abstractpub_date
2008-01-01 00:00:00pages
541-6eissn
0065-2598issn
2214-8019journal_volume
617pub_type
杂志文章abstract：:The fate and disposition of melatonin released into the circulation is still poorly understood, and almost all current knowledge is derived from measurements made after one single, often very large dose of labeled melatonin. In continuous infusion experiments in freely moving rats, 500 ng melatonin/mL hr had to be inf...
journal_title：Advances in experimental medicine and biology
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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：1987-01-01 00:00:00
