Catalog No.S1288 Synonyms: NSC-100880
Molecular Weight(MW): 348.35
Camptothecin is a specific inhibitor of DNA topoisomerase I (Topo I) with IC50 of 0.68 μM in a cell-free assay. Phase 2.
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CtIP and exonuclease 1 protect cells from chromosomal damage. (A) At 72 h after transfection with the indicated siRNA oligonucleotides, U2OS cells were treated with either DMSO or camptothecin (1 h, 1 μM; acute treatment) and survival was determined by colony formation. Data represent the mean±s.e.m. of five independent experiments. (B) Cell survival at low doses of camptothecin from the data shown in (A). Data represent the mean±s.e.m. of five independent experiments. (C) Cells transfected as in (A) were treated with either DMSO or camptothecin for 24 h (chronic treatment) and survival was determined by colony formation. Data represent the mean±s.e.m. of three independent experiments. (D) Metaphase spreads from cells transfected and treated as described in (A) were analysed for chromosomal aberrations. A total of 50 metaphase spreads was analysed for each sample. The percentages of metaphase spreads displaying the indicated numbers of radial chromosomes are shown. CNTL, control; DMSO, dimethyl sulphoxide; EXO1, exonuclease 1; siRNA, small interfering RNA.
EMBO Rep 2010 11(12), 962-8. Camptothecin purchased from Selleck.
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|Description||Camptothecin is a specific inhibitor of DNA topoisomerase I (Topo I) with IC50 of 0.68 μM in a cell-free assay. Phase 2.|
Camptothecin, a plant alkaloid orignially isolated from Camptotheca acuminate in 1966.  Camptothecin is noted to halt cells during the S phase of mitosis. Camptothecin displays nanomolar potency in cytotoxicity against many human tumor cell lines, including HT29, LOX, SKOV3, and SKVLB, with IC50 values ranging from 37 nM to 48 nM.  In combination with TNF, Camptothecin induces apoptosis in primary mouse hepatocytes, with an IC50 value of 13 μM. Camptothecin also abrogated the TNF-induced NF-κB Activation, as well as the expression of TNF-receptor associated factor 2 (TRAF2), X-linked inhibitor of apoptosis protein (X-IAP), and FLICE-inhibitory protein (FLIP).  In HCT116 cells, Camptothecin (5 μM) induces proteasome-mediated degradation of mixed lineage leukemia 5 (MLL5) protein, which leads to phosphorylation of p53 at Ser392.  Due to the low solubility and adverse effects of Camptothecin, various Camptothecin analogues have been developed, and two of them, topotecan and irinotecan, has been approved by FDA and are used in cancer chemotherapy.
|In vivo||Camptothecin (8 mg/kg) displays complete growth inhibition and regression in mice xenografts of various tumors, including colon, lung, breast, stomach, and ovary tumors.  In mice, combinations of Camptothecin (50 mg/kg) and TNF (5 and 7 μg/kg), but not Camptothecin alone, induces liver damage. |
Topoisomerase I Cleavable Complex Assay:Topoisomerase I is isolated from calf thymus and is devoid of topoisomerase II. All reactions are carried out in 10 mL volumes of reaction buffer (50 mM Tris-HCl, pH 7.5, 100 mM KCl, 0.5 mM EDTA, and 30 pg/mL BSA) in microtiter plates. Camptothecin is dissolved in DMSO at 10 mg/mL and serially diluted in 96-well microtiter plates to which the 32P end-labeled pBR322 DNA and topoisomerase enzyme are added. The reaction mixture is incubated at room temperature for 30 min and then the reaction stopped by adding 2 mL of a mixture of sodium dodecyl sulfate and proteinase K (1.6% and 0.14 mg/mL final concentrations, respectively). The plates are heated at 50 °C for 30 min, 10 mL of standard stop mixture containing 0.45 N NaOH is added in order to generate single-stranded DNA, and the samples are electrophoresed in 1.5% agarose gels in TBE buffer. Gels are blotted on nitrocellulose paper, dried, and exposed to X-ray film. The units of cleavage are calculated from the autoradiographs and plotted against the log drug concentration. The IC50 values are then obtaine
-  Wall ME, et al. J Am Chem Soc, 1966, 88 (16), 3888–3890.
-  Luzzio MJ, et al. J Med Chem, 1995, 38(3), 395-401.
-  Giovanella BC, et al. Cancer Res, 1991, 51(11), 3052-3055.
|In vitro||DMSO||3 mg/mL (8.61 mM)|
|In vivo||30% PEG400+0.5% Tween80+5% propylene glycol||30 mg/mL|
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT01803269||Terminated||Extensive Stage Small Cell Lung Cancer|Recurrent Small Cell Lung Cancer||University of Chicago|National Cancer Institute (NCI)||January 2013||Phase 2|
|NCT01612546||Completed||Adenocarcinoma of the Esophagus|Adenocarcinoma of the Gastroesophageal Junction|Diffuse Adenocarcinoma of the Stomach|Intestinal Adenocarcinoma of the Stomach|Mixed Adenocarcinoma of the Stomach|Recurrent Esophageal Cancer|Recurrent Gastric Cancer|Squamous Cell Carcinoma of the Esophagus|Stage IIIB Esophageal Cancer|Stage IIIB Gastric Cancer|Stage IIIC Esophageal Cancer|Stage IIIC Gastric Cancer|Stage IV Esophageal Cancer|Stage IV Gastric Cancer||City of Hope Medical Center|National Cancer Institute (NCI)||November 2012||--|
|NCT01202370||Completed||Solid Malignancies||University of Kentucky|Arno Therapeutics||September 2010||Phase 1|
|NCT01124539||Unknown status||Glioblastoma Multiforme|GBM|Gliosarcoma||Arno Therapeutics||December 2009||Phase 2|
|NCT00956787||Unknown status||Myelodysplastic Syndrome||Arno Therapeutics||June 2009||Phase 2|
|NCT00947739||Completed||Advanced Solid Tumors|Lymphomas||New Mexico Cancer Care Alliance|Christus Stehlin Foundation for Cancer Research||September 2008||Phase 1|
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