N-Desmethyltamoxifen
目录号 : GC25662N-Desmethyltamoxifen, the major metabolite of Tamoxifen in humans and a ten-fold more potent protein kinase C (PKC) inhibitor than Tamoxifen, also is a potent regulator of ceramide metabolism in human AML cells, limiting ceramide glycosylation, hydrolysis, and sphingosine phosphorylation.
Cas No.:31750-48-8
Sample solution is provided at 25 µL, 10mM.
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Quality Control & SDS
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N-Desmethyltamoxifen, the major metabolite of Tamoxifen in humans and a ten-fold more potent protein kinase C (PKC) inhibitor than Tamoxifen, also is a potent regulator of ceramide metabolism in human AML cells, limiting ceramide glycosylation, hydrolysis, and sphingosine phosphorylation.
[1] Vertosick FT Jr, et al. J Neurooncol. 1994;19(2):97-103. [2] Morad SA, et al. Biochim Biophys Acta. 2015 Jul;1851(7):919-28.
| Cas No. | 31750-48-8 | SDF | Download SDF |
| 分子式 | C25H27NO | 分子量 | 357.49 |
| 溶解度 | DMSO: 72 mg/mL (201.40 mM);Water: Insoluble;Ethanol: 36 mg/mL (100.70 mM) | 储存条件 | Store at -20°C |
| General tips | 请根据产品在不同溶剂中的溶解度选择合适的溶剂配制储备液；一旦配成溶液，请分装保存，避免反复冻融造成的产品失效。 储备液的保存方式和期限：-80°C 储存时，请在 6 个月内使用，-20°C 储存时，请在 1 个月内使用。 为了提高溶解度，请将管子加热至37℃，然后在超声波浴中震荡一段时间。 |
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1 mg | 5 mg | 10 mg |
| 1 mM | 2.7973 mL | 13.9864 mL | 27.9728 mL |
| 5 mM | 0.5595 mL | 2.7973 mL | 5.5946 mL |
| 10 mM | 0.2797 mL | 1.3986 mL | 2.7973 mL |
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Tissue distribution of 4-hydroxy-N-desmethyltamoxifen and tamoxifen-N-oxide
Breast Cancer Res Treat 2012 Jul;134(2):693-700.PMID:22562123DOI:10.1007/s10549-012-2074-9.
Tamoxifen dosage is based on the one-dose-fits-all approach. The anticancer effect of tamoxifen is believed to be due to the metabolites, 4-hydroxytamoxifen (4OHtam), and 4-hydroxy-N-desmethyltamoxifen (4OHNDtam/endoxifen). These demethylated metabolites of tamoxifen have been associated with its side effects, whereas the effect mediated by tamoxifen-N-oxide (tamNox) is still poorly understood. Our objective was to improve the therapeutic index of tamoxifen by personalizing its dosage and maintaining serum tamoxifen metabolite concentrations within a target range. We examined the levels of tamoxifen, 4OHtam, 4OHNDtam, N-Desmethyltamoxifen (NDtam), N-desdimethyltamoxifen (NDDtam), and tamNox in serum and in breast tumors specimens of 115 patients treated with 1, 5 or 20 mg/day of tamoxifen for 4 weeks before surgery in a randomized trial. Furthermore, the metabolism of tamNox in MCF-7 breast cancer cells was also studied. The concentrations of tamoxifen and its metabolites in tumor tissues were significantly correlated to their serum levels. Tumor tissue levels were 5-10 times higher than those measured in serum, with the exception of tamNox. In MCF-7 cells, tamNox was converted back to tamoxifen. In contrast to the tissue distribution of tamNox, the concentrations of 4OHtam and 4OHNDtam in tumor tissues corresponded to their serum levels. The results suggest that implementation of therapeutic drug monitoring may improve the therapeutic index of tamoxifen. Furthermore, the tissue distribution of tamNox deviated from that of the other tamoxifen metabolites.
Further characterization of the DNA adducts formed in rat liver after the administration of tamoxifen, N-Desmethyltamoxifen or N, N-didesmethyltamoxifen
Carcinogenesis 1999 Oct;20(10):2011-6.PMID:10506118DOI:10.1093/carcin/20.10.2011.
The present study compares the formation of DNA adducts, determined by (32)P-postlabelling, in the livers of rats given tamoxifen and the N-demethylated metabolites N-Desmethyltamoxifen and N, N-didesmethyltamoxifen. Results show that after 4 days treatment (0.11 mmol/kg i.p.), similar levels of DNA damage were seen after treatment with either tamoxifen or N-Desmethyltamoxifen [109 +/- 40 (n = 3) and 100 +/- 33 (n = 4) adducts/10(8) nucleotides, respectively], even though the concentration of tamoxifen in the livers of tamoxifen-treated rats was about half that of N-Desmethyltamoxifen in the N-desmethyltamoxifen-treated animals (51 +/- 16 and 100 +/- 8 nmol/g, respectively). Administration of N, N-didesmethyltamoxifen to rats resulted in a 5-fold lower level of damage (19 adducts/10(8) nucleotides, n = 2). Following (32)P-postlabelling and HPLC, hepatic DNA from rats treated with tamoxifen and its metabolites showed distinctive patterns of adducts. Treatment of rats with N,N-didesmethyltamoxifen gave a major product that co-eluted with one of the minor adduct peaks seen in the livers of rats given tamoxifen. Following dosing with N-Desmethyltamoxifen, the major product co-eluted with one of the main peaks seen following treatment of rats with tamoxifen. This suggests that tamoxifen can be metabolically converted to N-Desmethyltamoxifen prior to activation. However, analysis of the (32)P-postlabelled products from the reaction between alpha-acetoxytamoxifen and calf thymus DNA showed two main peaks, the smaller one of which ( approximately 15% of the total) also co-eluted with that attributed to N-Desmethyltamoxifen. This indicates that N-Desmethyltamoxifen and N,N-didesmethyltamoxifen are activated in a similar manner to tamoxifen leading to a complex mixture of adducts. Since an HPLC system does not exist that can fully separate all these (32)P-postlabelled adducts, care has to be taken when interpreting results and determining the relative importance of individual adducts and the metabolites they are derived from in the carcinogenic process.
Interactions of tamoxifen, N-Desmethyltamoxifen and 4-hydroxytamoxifen with P-glycoprotein and CYP3A
Biopharm Drug Dispos 2004 Oct;25(7):283-9.PMID:15386482DOI:10.1002/bdd.411.
The effects of tamoxifen, N-Desmethyltamoxifen and 4-hydroxytamoxifen on transport attributable to P-glycoprotein were studied using Caco-2 cell monolayers in a transwell system, with rhodamine-123 as an index substrate for inhibition studies. The three compounds did not demonstrate differential flux between basal-apical and apical-basal directions in Caco-2 monolayers. The mean IC50 values for inhibition of rhodamine-123 transport were: 29 microM for tamoxifen; 26 microM for N-Desmethyltamoxifen; and 7.4 microM for 4-hydroxytamoxifen. The three compounds were also evaluated as potential inhibitors of human CYP3A based on an in vitro model using triazolam hydroxylation by human liver microsomes as an index reaction. Mean (+/-SE) IC50 values versus formation of alpha-hydroxy-triazolam and 4-hydroxy-triazolam in human liver microsomes were, respectively: 23.5 (+/-3.9) and 18.4 (+/-5.3) microM for tamoxifen; 10.2 (+/-1.7) and 9.2 (+/-1.5) microM for N-Desmethyltamoxifen; and 2.6 (+/-0.5) and 2.7 (+/-0.3) microM for 4-hydroxytamoxifen. Thus, tamoxifen, N-Desmethyltamoxifen and 4-hydroxytamoxifen, do not appear to be substrates for transport by P-glycoprotein. However, tamoxifen has the potential to inhibit transport mediated by P-glycoprotein as well as CYP3A-mediated metabolism. Inhibitory effects of the principal metabolites, N-Desmethyltamoxifen and 4-hydroxytamoxifen, may exceed those of the parent drug. Tamoxifen, and possibly its metabolites, may have the potential to cause drug interactions by inhibiting both drug transport and metabolism. This possibility requires further evaluation in clinical studies.
Dose-dependent effects of Hedyotis diffusa extract on the pharmacokinetics of tamoxifen, 4-hydroxytamoxifen, and N-Desmethyltamoxifen
Biomed Pharmacother 2022 Jan;145:112466.PMID:34839255DOI:10.1016/j.biopha.2021.112466.
Tamoxifen, a widely prescribed medication in premenopausal women diagnosed with hormone-dependent breast cancer, is potentially co-prescribed with Hedyotis diffusa (H. diffusa), particularly in Taiwan. However, no related report has investigated the drug-herb interaction of H. diffusa on the pharmacokinetics of tamoxifen and its metabolites. In the present study, male Sprague-Dawley rats were administered different doses of H. diffusa extract for 5 consecutive days prior to the administration of tamoxifen (10 mg/kg). A validated ultra-liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) system was developed to monitor tamoxifen, 4-hydroxytamoxifen, N-Desmethyltamoxifen, and endoxifen in rat plasma. Pharmacokinetic results demonstrated that the area under curves (AUCs) of tamoxifen and the relative bioavailability (%) of tamoxifen were dose-dependently decreased (31-68%) by pre-treatment with H. diffusa extract (3 g/kg and 6 g/kg). In addition, the conversion ratio of 4-hydroxytamoxifen was downregulated (0.5-fold change) and the N-Desmethyltamoxifen conversion ratio was upregulated (2-fold change) by high-dose H. diffusa extract. As a result, the relative bioavailability and biotransformation changes affect the clinical efficacy of tamoxifen treatment. These preclinical findings reveal a hitherto unreported interaction between tamoxifen and H. diffusa extract that has implications for their therapeutic efficacy in treating breast cancer.
Characterization of the major DNA adduct formed by alpha-hydroxy-N-desmethyltamoxifen in vitro and in vivo
Chem Res Toxicol 2000 Mar;13(3):200-7.PMID:10725117DOI:10.1021/tx990187b.
Tamoxifen is hepatocarcinogenic in rats and has been associated with an increased risk of endometrial cancer in women. Recent reports suggest that it may be genotoxic in humans. N-Desmethyltamoxifen is a major tamoxifen metabolite that has been proposed to be responsible for one of the major adducts detected in liver DNA of rats treated with tamoxifen. The metabolic activation of N-Desmethyltamoxifen to DNA binding products may involve oxidation to alpha-hydroxy-N-desmethyltamoxifen followed by esterification. In the study presented here, we report the synthesis of alpha-hydroxy-N-desmethyltamoxifen and the characterization of the major adduct obtained from alpha-sulfoxy-N-desmethyltamoxifen in vitro as (E)-alpha-(deoxyguanosin-N(2)-yl)-N-desmethyltamoxifen. In addition, we use (32)P-postlabeling in combination with HPLC to compare the adducts formed in the livers of female Sprague-Dawley rats treated by gavage with tamoxifen or equimolar doses of alpha-hydroxy-N-desmethyltamoxifen. We conclude that one of the major adducts formed in vivo and previously suggested to derive from N-Desmethyltamoxifen is chromatographically identical to alpha-(deoxyguanosin-N(2)-yl)-N-desmethyltamoxifen.