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Title:
The activity of camptothecin analogues is enhanced in histocultures of human tumors and human tumor xenografts by modulation of extracellular pH | Cancer Chemotherapy and Pharmacology
Description:
Background Most solid human tumors exist in an acidic microenvironment, due in part to inefficient vasculature and a higher intrinsic rate of glycolysis. This leads to a tumor-selective pH gradient, which can be exploited therapeutically with antitumor agents such as the camptothecins (CPTs). Previous work in this laboratory has shown that camptothecin activity is enhanced 40- to 60-fold in monolayer cell culture by reducing the extracellular pH to 6.8. Three-dimensional histoculture has been shown to be a technique that allows human tumor tissue to grow in an in vivo-like way with maintenance of tissue histology and function and drug sensitivity for long periods of time. Purpose In the current study, we utilized these features of histoculture to study new analogues of camptothecin that have superior pharmacological properties. Methods We evaluated six CPT analogues in histocultures of human brain, neuroblastoma, breast, colon, and prostate tumors. Fragments were exposed to 10,11-methylenedioxy-CPT (MDC), 7-chloromethyl-MDC, SN-38, topotecan (TPT), 9-amino-CPT, 10-amino-CPT, paclitaxel, 5-fluorouracil, 4-hydroperoxycyclophosphamide and doxorubicin, and antitumor activity was assessed. For in vivo tumor outgrowth studies, fragments were treated in parallel, implanted into nude mice, and monitored for development of tumors. Results Against 15 of 16 tumor xenografts and all primary tumor samples tested, all compounds were cytotoxic at pH 7.4 (IC50 range 13β921 ΞΌM). MDC, SN-38, TPT, and 9-amino-CPT achieved an average 5-fold increase in activity (range 3β14) at pH 6.8, while 7-chloromethyl-MDC was enhanced 8-fold (range 6β14). The most potentiated analogue was 10-amino-CPT at 27-fold (range 17β49). In contrast, the other agents were active against one or more tumor types but were not enhanced by acidic pH. Importantly, the toxicity of MDC in histoculture of D54 glioma xenografts strongly correlated with the outgrowth of treated fragments subsequently implanted in vivo. Conclusion Evaluation of anticancer drug activity in native-state histoculture supports the concept that pH modulation may be an important approach to improve the selectivity and antitumor effectiveness of camptothecin-based chemotherapy.
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google, scholar, pubmed, cas, cancer, human, hoffman, histoculture, article, camptothecin, activity, tumors, tumor, drug, prostate, res, wall, cell, vitro, wani, flowers, antitumor, growth, connors, manikumar, topoisomerase, research, analogues, colvin, adams, threedimensional, anticancer, enhanced, extracellular, sci, response, geller, head, neck, duke, privacy, cookies, content, chemotherapy, xenografts, dewhirst, tissue, nativestate, access, synthesis,
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month download article/chapter sponge-gel matrix histoculture camptothecin-based anti-neuroblastoma activity small-cell lung cancers histoculture drug-response assay general native-state method c-ha-ras expression native-state histoculture supports related subjects low-ph-adapted cells tumor-selective ph gradient e-ring-modified camptothecin article cancer chemotherapy full article pdf monolayer cell culture privacy choices/manage cookies cancer cell lines camptothecin-based chemotherapy histotypical culture conditions eukaryotic dna topoisomerase research triangle park mammalian dna topoisomerase duke urology department duke neurooncology department native-state histoculture selective tumor acidification acquired drug resistance burke tg mammalian cells adapted human blood components duke surgical pathology human tumor xenografts human tumor tissue growth-inhibition studies human lung tumors androgen-dependent growth circumventing tamoxifen resistance gene expression patterns cellular ph gradient growth fraction index european economic area higher intrinsic rate superior pharmacological properties lipid bilayer partitioning platinum analog [pt induce unique conformational 93rd annual meeting dual role meerson-monosov az da costa pm
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headline:The activity of camptothecin analogues is enhanced in histocultures of human tumors and human tumor xenografts by modulation of extracellular pH
description:Most solid human tumors exist in an acidic microenvironment, due in part to inefficient vasculature and a higher intrinsic rate of glycolysis. This leads to a tumor-selective pH gradient, which can be exploited therapeutically with antitumor agents such as the camptothecins (CPTs). Previous work in this laboratory has shown that camptothecin activity is enhanced 40- to 60-fold in monolayer cell culture by reducing the extracellular pH to 6.8. Three-dimensional histoculture has been shown to be a technique that allows human tumor tissue to grow in an in vivo-like way with maintenance of tissue histology and function and drug sensitivity for long periods of time. In the current study, we utilized these features of histoculture to study new analogues of camptothecin that have superior pharmacological properties. We evaluated six CPT analogues in histocultures of human brain, neuroblastoma, breast, colon, and prostate tumors. Fragments were exposed to 10,11-methylenedioxy-CPT (MDC), 7-chloromethyl-MDC, SN-38, topotecan (TPT), 9-amino-CPT, 10-amino-CPT, paclitaxel, 5-fluorouracil, 4-hydroperoxycyclophosphamide and doxorubicin, and antitumor activity was assessed. For in vivo tumor outgrowth studies, fragments were treated in parallel, implanted into nude mice, and monitored for development of tumors. Against 15 of 16 tumor xenografts and all primary tumor samples tested, all compounds were cytotoxic at pH 7.4 (IC50 range 13β921Β ΞΌM). MDC, SN-38, TPT, and 9-amino-CPT achieved an average 5-fold increase in activity (range 3β14) at pHΒ 6.8, while 7-chloromethyl-MDC was enhanced 8-fold (range 6β14). The most potentiated analogue was 10-amino-CPT at 27-fold (range 17β49). In contrast, the other agents were active against one or more tumor types but were not enhanced by acidic pH. Importantly, the toxicity of MDC in histoculture of D54 glioma xenografts strongly correlated with the outgrowth of treated fragments subsequently implanted in vivo. Evaluation of anticancer drug activity in native-state histoculture supports the concept that pH modulation may be an important approach to improve the selectivity and antitumor effectiveness of camptothecin-based chemotherapy.
datePublished:2003-06-03T00:00:00Z
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Histoculture
pH modulation
In vitro drug screening
Oncology
Pharmacology/Toxicology
Cancer Research
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Histoculture
pH modulation
In vitro drug screening
Oncology
Pharmacology/Toxicology
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