Abstract:
OBJECTIVE:It has already been demonstrated that the rat esophagus produces retinoic acid from retinol. In this study, this process is further characterized and the effect of acetaldehyde examined to elucidate the possible mechanisms behind the epidemiological evidence that the incidence of esophageal cancer is higher in alcoholics. MATERIAL AND METHODS:Rat esophageal samples were incubated with all-trans retinal and newly formed all-trans retinoic acid (ATRA) was quantified using high-performance liquid chromatography (HPLC). Furthermore, beta-nicotinamide adenine dinucleotide (NAD)-dependent acetaldehyde oxidation by the rat esophagus was examined by tracing NAD reduction using a spectrophotometer. RESULTS:Rat esophageal samples produced ATRA from all-trans retinal in a NAD-dependent manner and the potential was significantly attenuated by phenetyl isothiocynate, an ALDH inhibitor, or acetaldehyde depending on the concentration used. Rat esophageal samples also oxidized acetaldehyde of various concentrations NAD dependently. The ATRA formation potential that was temporarily inhibited by acetaldehyde was recovered to the control level by dialysis when the specimen was incubated with up to 50 microM of acetaldehyde. CONCLUSIONS:The rat esophagus produces retinoic acid from retinal. An ALDH isoform(s) is responsible for this process and physiological concentration of acetaldehyde hampers the process, probably in a competitive manner. Since the disturbance of retinoic acid supply has been implicated in carcinogenicity, this finding may, at least in part, explain the high incidence of esophageal cancer in alcoholics, especially in those with inactive ALDH 2 whose blood acetaldehyde levels become higher than those with active ALDH 2.
journal_name
Scand J Gastroenteroljournal_title
Scandinavian journal of gastroenterologyauthors
Shiraishi-Yokoyama H,Yokoyama H,Matsumoto M,Imaeda H,Hibi Tdoi
10.1080/00365520510023936subject
Has Abstractpub_date
2006-01-01 00:00:00pages
80-6issue
1eissn
0036-5521issn
1502-7708pii
N01745214J2P0T58journal_volume
41pub_type
杂志文章abstract:OBJECTIVE:Sofosbuvir and simeprevir in combination with standard therapy are now available for the treatment of patients chronically infected with hepatitis C virus (HCV) genotype 1. With boceprevir and telaprevir, four treatment options are, therefore, now available to clinicians. Phase 3 studies conducted with simepr...
journal_title:Scandinavian journal of gastroenterology
pub_type: 杂志文章,评审
doi:10.3109/00365521.2014.978364
更新日期:2015-04-01 00:00:00
abstract::Background: Neuroendocrine tumours (NETs) in the ileum grow slowly but metastasise to the liver at an early stage. After resection of the primary tumour and mesenteric lymph nodes, selected patients with liver metastases have been operated with curative intention. Recurrence-free survival seems low, suggesting that mi...
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journal_title:Scandinavian journal of gastroenterology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:10.3109/00365529109025023
更新日期:1991-02-01 00:00:00
abstract::In a study comprising 100 patients referred to a surgical clinic with symptoms suggestive of gastro-oesophageal reflux disease the value of different diagnostic procedures was investigated. Positive acid perfusion and 24-h pH tests were the commonest findings. Forty-nine per cent showed a normal oesophageal mucosa or ...
journal_title:Scandinavian journal of gastroenterology
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doi:10.3109/00365528609011128
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abstract::Alpha-fetoprotein (AFP), carcinoembryonic antigen (CEA), alkaline phosphatase (ALP) and gamma-glutamyltranspeptidase (GT) were determined in three groups of patients: 21 with primary liver carcinoma (PLC), 106 with metastatic liver disease, and 110 with various degrees of alcoholic liver diseases. AFP was elevated in ...
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doi:10.1080/00365520802556809
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journal_title:Scandinavian journal of gastroenterology
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journal_title:Scandinavian journal of gastroenterology
pub_type: 临床试验,杂志文章,随机对照试验
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pub_type: 杂志文章,随机对照试验
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更新日期:2007-06-01 00:00:00
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journal_title:Scandinavian journal of gastroenterology
pub_type: 杂志文章
doi:10.1080/00365529850171017
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pub_type: 临床试验,杂志文章,随机对照试验
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更新日期:2017-10-01 00:00:00
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journal_title:Scandinavian journal of gastroenterology
pub_type: 杂志文章,多中心研究
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更新日期:2013-02-01 00:00:00
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pub_type: 临床试验,杂志文章
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更新日期:2001-04-01 00:00:00
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pub_type: 杂志文章
doi:10.3109/00365521.2015.1010570
更新日期:2015-07-01 00:00:00
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pub_type: 杂志文章
doi:10.3109/00365529609010345
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journal_title:Scandinavian journal of gastroenterology
pub_type: 临床试验,杂志文章,多中心研究,随机对照试验
doi:
更新日期:2002-07-01 00:00:00
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更新日期:2004-01-01 00:00:00
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更新日期:1982-08-01 00:00:00
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doi:10.1080/003655200750023336
更新日期:2000-07-01 00:00:00