Abstract：
:Tannic acid (TA) is a naturally occurring phenol, which has been found to display an antipromotion effect on mouse skin carcinogenesis. In order to explore the molecular mechanism, we have examined the process of 12-O-tetradecanoylphorbol-13-acetate (TPA)-induced protein kinase C (PKC) activation, including phorbol ester binding, enzyme translocation, autophosphorylation and substrate phosphorylation, and finally the TPA-stimulated DNA synthesis. In an initial study, we found that TA slightly inhibited [3H]phorbol dibutyrate (PDBu) binding to intact cells, and only 30% reduction of phorbol ester binding was observed at the highest dose of TA (100 microM). Further analysis by Scatchard plot showed that TA reduced the Bmax of [3H]PDBu from 1.3 pmol/10(6) cells to 1.1 pmol/10(6) cells, but the Kd was increased from 24 to 30 nM. Analysis by western blot indicated that TA did not interfere with the TPA-induced PKC translocation, whereas TA effectively blocked the TPA-evoked phosphorylation of the membrane-bound PKC moiety and its 80 kDa substrate in a dose-dependent manner. We also found that pre- or post-treatment with TA both lead to a similar reduction of 80 kDa protein phosphorylation and that the TPA-stimulated DNA synthesis was also inhibited by TA in a dose-dependent manner, suggesting that the blockage of protein phosphorylation by TA was of biological significance. In conclusion, the work presented here demonstrated that the antitumor promoting effect of TA was not mediated by competing for the binding site with phorbol ester or interrupting the PKC translocation, but rather by effectively blocking phosphorylation by membrane-bound PKC, possibly through altering the biophysical properties of the membrane environment.
journal_name
Biochem Pharmacoljournal_title
Biochemical pharmacologyauthors
Kuo ML,Wu WS,Lee KC,Lin JKdoi
10.1016/0006-2952(93)90095-esubject
Has Abstractpub_date
1993-10-19 00:00:00pages
1327-32issue
8eissn
0006-2952issn
1873-2968pii
0006-2952(93)90095-Ejournal_volume
46pub_type
杂志文章abstract：:Gemcitabine (dFdC) is a new cytidine analogue which is active mainly by the incorporation of its triphosphate (dFdCTP) into DNA, leading to cell death. We determined incorporation of dFdC into nucleic acids of two solid tumour cell lines: the murine colon carcinoma cell line Colon 26-10, the human ovarian carcinoma ce...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(93)90566-f
更新日期：1993-08-17 00:00:00
abstract：:Chronic treatment with a low dose of reserpine (0.1 mg/kg) caused rats to become hyperactive in the "open field" apparatus. When mianserin (5 mg/kg) or the selective serotonin uptake inhibitor ORG. 6582 (5 mg/kg) was chronically administered in combination with reserpine, the hyperactivity was attenuated. Both antidep...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(83)90329-5
更新日期：1983-05-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(84)90234-x
更新日期：1984-02-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/j.bcp.2009.07.020
更新日期：2009-12-15 00:00:00
abstract：:Theophylline, caffeine, isobutylmethylxanthine, papaverine, N6-cyclohexyladenosine, N6-allyl-N6-cyclohexyladenosine ( ACHA ) and N6-L-phenylisopropyladenosine (L-PIA) inhibited the transport of adenosine, uridine and hypoxanthine in Novikoff rat hepatoma cells. The IC50 values for the inhibition of uridine transport r...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(84)90350-2
更新日期：1984-06-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(96)00457-1
更新日期：1996-10-11 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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journal_title：Biochemical pharmacology
pub_type： 杂志文章,评审
doi：10.1016/s0006-2952(99)00296-8
更新日期：2000-01-01 00:00:00
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pub_type： 杂志文章
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更新日期：2004-04-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2019.113779
更新日期：2020-06-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(92)90064-p
更新日期：1992-11-03 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(03)00246-6
更新日期：2003-07-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(87)90411-4
更新日期：1987-04-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2004.03.017
更新日期：2004-07-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(03)00114-x
更新日期：2003-05-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(91)90476-l
更新日期：1991-01-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2013.10.009
更新日期：2013-12-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(92)90356-n
更新日期：1992-12-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(82)90632-3
更新日期：1982-11-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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更新日期：1989-01-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(87)90377-7
更新日期：1987-01-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
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更新日期：1998-12-15 00:00:00
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journal_title：Biochemical pharmacology
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doi：10.1016/j.bcp.2003.10.018
更新日期：2004-03-01 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/s0006-2952(01)00566-4
更新日期：2001-04-15 00:00:00
abstract：:The protective action of cysteine or mercaptopropionylglycine (MPG) in acute ethanol-induced liver injury has been investigated in the rat. Cysteine accelerated clearance of ethanol and acetaldehyde from blood and liver and prevented an increase in hepatic content of triglyceride and serum ornithine carbamoyl transfer...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(83)90562-2
更新日期：1983-01-15 00:00:00
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journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(94)90138-4
更新日期：1994-02-11 00:00:00
abstract：:The serine esterase inhibitor diisopropyl fluorophosphate (DFP) had been reported previously to inhibit IgE-dependent histamine release. Recently, it has been demonstrated that lower concentrations of DFP enhance IgE-dependent histamine release and inhibit desensitization. This manuscript describes the abilities of se...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/0006-2952(86)90686-6
更新日期：1986-12-01 00:00:00
abstract：:Escape from the proper control of the cell cycle by up-regulation of cyclins or aberrant activation of cyclin-dependent kinases (CDKs) as well as by inactivation of cellular inhibitors of CDKs (CKI) leads to malignant transformation. Loss of cellular CKIs in cancers provided a rationale for development of pharmacologi...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2008.07.040
更新日期：2008-12-01 00:00:00
abstract：:During the molecular transduction of itch, the stimulation of pruriceptors on sensory fibers leads to the activation or sensitization of ion channels, which results in a consequent depolarization of the neurons. These ion channels mostly belong to the transient receptor potential (TRP) channels, which are involved in ...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2020.114310
更新日期：2021-01-01 00:00:00
abstract：:We have been studying the requirement for the aryl hydrocarbon receptor nuclear translocator (Arnt)-dependent DNA complex formation, which precedes the activation of gene transcription. Using DEAE chromatography, we have obtained a Sf9 insect fraction F5 that is highly enriched with beta-tubulin. F5 inhibits the forma...
journal_title：Biochemical pharmacology
pub_type： 杂志文章
doi：10.1016/j.bcp.2009.12.010
更新日期：2010-04-15 00:00:00
