Drugs online research references
Acta Pharmacol Sin. 2000 Aug;21(8):753-8.
Probing CYP2C19 and CYP3A4 activities in Chinese liver microsomes by quantification of 5-hydroxyomeprazole and omeprazole sulphone.
Shu Y, Wang LS, Xiao WM, Wang W, Huang SL, Zhou HH.
Pharmacogenetics Research Institute, Hunan Medical University, Changsha 410078, China.
AIM: To develop an analytical method for simultaneous quantification of 5-hydroxyomeprazole (5-OH-OP) and omeprazole sulfone (OPS), and explore whether omeprazole (OP) is an appropriate phenotypic probe for CYP2C19 and CYP3A4 in Chinese liver microsomes. METHODS: OP metabolism in vitro was conducted in Chinese liver microsomes, and the major metabolites 5-OH-OP and OPS were determined using high pressure liquid chromatography (HPLC). Monoclonal antibodies anti-CYP2C8/9/19 and anti-CYP3A4 were employed to conduct inhibition experiments. The protein contents of CYP2C19 and CYP3A4 were quantified using Western blot analysis and densitometric scanning. RESULTS: 5-OH-OP and OPS gave a baseline resolution in the HPLC analysis. The detection limits for both compounds were 0.01 nmol and the recovery (98%-102%) had good precision with relative standard deviation of < 9.5%. Both anti-CYP2C8/9/19 and anti-CYP3A4 had a significant inhibitory effect (P < 0.05) on the 5-OH-OP formation in a substrate concentration-dependent manner, and anti-CYP3A4 alone could almost abolish the formation of OPS (> 87%). At a substrate concentration of 2 mumol/L OP, good correlations were found between OP 5-hydroxylation and S-mephenytoin 4'-hydroxylation activities (r = 0.72, P < 0.01), OP 5-hydroxylation activities and CYP2C19 contents (r = 0.82, P < 0.01), and OP sulfoxidation activities and CYP3A4 contents (r = 0.78, P < 0.01) in Chinese liver microsomes. CONCLUSION: OP metabolism is mediated mainly by CYP2C19 and CYP3A4, and OP can be used to probe CYP2C19 and CYP3A4 activities in Chinese liver microsomes at appropriate substrate concentrations with the HPLC method presently developed.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11501187&dopt=Abstract
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gata.edu.tr
OBJECTIVE: The aim of this study was to determine whether a relationship exists between gastric and oral Helicobacter pylori and oral hygiene in patients with vitamin B12 deficiency. STUDY DESIGN: One hundred eight patients with vitamin B12 deficiency who were H pylori -positive in their gastric mucosa were enrolled in the study. These patients were divided into 3 groups determined by Oral Hygiene Index (OHI) scores of good, fair, or poor. H pylori was detected in the dental plaque with camphylobacter-like organism test gels. All patients were treated with a combination regimen to eradicate H pylori. RESULTS: H pylori positivity in dental plaque was correlated with OHI scores; the positivity was 28.5%, 90.2%, or 100% in patients with good, fair, or poor OHI scores, respectively. The eradication of H pylori was associated with recovery from anemia and increased serum vitamin B12 level (P <.0001 and P <.0001). The patients with poor OHI scores had the most frequent gastric recurrence of H pylori (58.3%) compared with those with fair OHI scores (41.2%) and good OHI scores (4.8%). CONCLUSIONS: H pylori seems to be an etiologic factor in vitamin B12 deficiency, since anemia was cured and the level of vitamin B12 in the serum increased as a result of its eradication. However, eradication of H pylori from gastric mucosa alone is not enough to prevent gastric recurrence of the bacteria. Proper oral hygiene must be established to eliminate H pylori in dental plaque. Therefore, we suggest that control of H pylori in dental plaque is necessary to control recurrence of H pylori.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11505263&dopt=Abstract
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akh-celle.de
OBJECTIVE: To evaluate the dynamics of histological changes in the mucosa of the stomach and duodenal bulb during and after completion of a 14-day course of Hp-eradication dual treatment with high-dose omeprazole and amoxicillin. PATIENTS: 12 patients (mean age 53 +/- 16 years SD, 9 male, 3 female) with an acute Hp-positive duodenal ulcer were included in this open, prospective, single-centre study. METHOD: Patients were given omeprazole 40 mg b.i.d. and amoxicillin 1,500 mg b.i.d. for a period of 14 days. Endoscopic biopsies were obtained on days 3, 7, 14, 28, 42 as well as at following endoscopies performed a mean of 17 months after treatment. RESULTS: The Hp-eradication rate achieved 4 weeks after treatment was 82%. On day 14, 88% of the ulcers were healed. Already on day 7 Hp had almost completely disappeared from the antrum, corpus and duodenal bulb, and the activity of gastritis in the antrum and corpus and the activity of bulbitis in the duodenal bulb was almost nonexistent. The decrease in the grade of gastritis was much lower by day 42. CONCLUSIONS: Our study shows for the first time that in all patients signs of primarily successful Hp-eradication treatment during the first days of treatment are consistently demonstrable and complete already after one week of therapy, irrespective of the subsequent cure or persistence of Hp-infection. In the patients with persistence of Hp-infection Hp-colonization and activity of gastritis quickly increased within 2-4 weeks after cessation of treatment. Checks to evaluate complete eradication or recrudescence of Hp-infection should be carried out not earlier than 28 days after cessation of treatment.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11505330&dopt=Abstract
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