Abstract：
:The microsomal metabolism of pentachlorophenol (PCP) was investigated, with special attention to the conversion dependent covalent binding to protein and DNA. The two metabolites detected were tetrachloro-1,2- and tetrachloro-1,4-hydroquinone. Microsomes from isosafrole (ISF)-induced rats were by far the most effective in catalyzing the reaction: the rate of conversion was increased 7-fold over control microsomes. All other inducers tested (hexachlorobenzene (HCB), phenobarbital (PB) and 3-methylcholanthrene (3MC) gave 2--3-fold increases over control. There are indications that the 1,2- and 1,4-isomers are produced in different ratio's by various cytochrome P-450 isoenzymes: Microsomes from PB- and HCB-treated rats produced the tetrachloro-1,4- and tetrachloro-1,2-hydroquinone in a ratio of about 2, while microsomes from rats induced with 3 MC and ISF showed a ratio of about 1.3. When PCP was incubated with microsomes from rats treated with HCB, a mixed type inducer of P-450, the ratio between formation of the 1,4- and 1,2-isomers decreased with increasing concentration of PCP, suggesting the involvement of at least two P-450 isoenzymes with different Km-values. The overall apparent Km-value for HCB-microsomes was 13 microM both for the formation of the soluble metabolites and the covalent binding to microsomal protein, suggesting both stem from the same reaction. The covalent binding could be inhibited by ascorbic acid and this inhibition was accompanied by an increase in formation of tetrachlorohydroquinones (TCHQ). Although a large variation was observed in rates of conversion between microsomes treated with different (or no) inducers, the rate of covalent binding to microsomal protein was remarkably constant. A conversion-dependent covalent binding to DNA was observed in incubations with added DNA which was 0.2 times the amount of binding to protein (37 pmol/mg DNA).
journal_name
Chem Biol Interactjournal_title
Chemico-biological interactionsauthors
van Ommen B,Adang A,Müller F,van Bladeren PJdoi
10.1016/0009-2797(86)90013-xsubject
Has Abstractpub_date
1986-10-15 00:00:00pages
1-11issue
1eissn
0009-2797issn
1872-7786pii
0009-2797(86)90013-Xjournal_volume
60pub_type
杂志文章abstract：:Lanthanides (Ln) were known to induce cell apoptosis, which might be the results of their effects on mitochondria (MT). This study was trying to clarify the role of MT and reactive oxygen species (ROS) in Ln-induced apoptosis. We found that micromolar or lower concentration of La(3+), Gd(3+) and Yb(3+) bound to MT and...
journal_title：Chemico-biological interactions
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journal_title：Chemico-biological interactions
pub_type： 信件
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(79)90137-6
更新日期：1979-10-01 00:00:00
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journal_title：Chemico-biological interactions
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doi：10.1016/j.cbi.2009.06.014
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journal_title：Chemico-biological interactions
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journal_title：Chemico-biological interactions
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journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
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journal_title：Chemico-biological interactions
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更新日期：2005-12-15 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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更新日期：2017-05-25 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
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更新日期：2018-12-25 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(76)90159-9
更新日期：1976-10-02 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/s0009-2797(00)00270-2
更新日期：2001-01-30 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2015.11.008
更新日期：2016-08-05 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(83)90078-9
更新日期：1983-08-01 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2018.08.001
更新日期：2018-09-25 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(76)90137-x
更新日期：1976-12-01 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2004.10.007
更新日期：2005-02-10 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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journal_title：Chemico-biological interactions
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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更新日期：2020-08-25 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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更新日期：2000-10-16 00:00:00
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journal_title：Chemico-biological interactions
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更新日期：2021-01-05 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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更新日期：1993-09-01 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
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更新日期：1988-01-01 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
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更新日期：2019-08-01 00:00:00
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journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/s0009-2797(01)00274-5
更新日期：2001-12-21 00:00:00
abstract：:Melatonin is a hormone produced in animals by the pineal gland and in plants under stress. Melatonin research has expanded rapidly, affecting an impressive enhancement in the understanding of its functions in plants and animals. However, far less focus has been directed to clarifying the nature of melatonin dose-respo...
journal_title：Chemico-biological interactions
pub_type： 杂志文章,评审
doi：10.1016/j.cbi.2018.12.008
更新日期：2019-02-01 00:00:00
abstract：:This study demonstrates that whilst some DNA-repair deficiencies can be detected using host cell reactivation of cisplatin (CDDP)-treated adenovirus (Ad5), not all repair deficiencies affected replication of CDDP-treated Ad5 in human cells. A line of fibroblasts (XP25), derived from a patient with a UV-hypersensitive ...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/0009-2797(89)90110-5
更新日期：1989-01-01 00:00:00
abstract：:Butyrylcholinesterase (BChE) is coded by the BCHE gene that presents four exons. The non-codifying exon 1 presents two variants -116G and -116A, being -116A preferentially in cis conformation with the 539T variant (K) of exon 4 which was associated with lower BChE activity and lower body mass index (BMI) variance. Thi...
journal_title：Chemico-biological interactions
pub_type： 杂志文章
doi：10.1016/j.cbi.2008.04.019
更新日期：2008-09-25 00:00:00
