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1.
Pathobiology ; 75(3): 156-70, 2008.
Article in English | MEDLINE | ID: mdl-18550913

ABSTRACT

OBJECTIVES: To evaluate the efficacy of 2 potentized homeopathic remedies of Arsenicum Album (Ars Alb)--6C and 30C--in combating chronic arsenic toxicity induced by repeated sublethal injections in mice (Mus musculus). METHODS: Mice were randomized and divided into sets: (1) normal (control 1); (2) normal + succussed alcohol (control 2); (3) As(2)O(3) (0.016%) injected at 1 ml/100 g body weight every 7 days (treated); (4) As(2)O(3) injected + succussed alcohol (positive control); (5) As(2)O(3) injected + Ars Alb 6C (drug-fed); (6) As(2)O(3) injected + Ars Alb 30C (drug-fed). Cytogenetical endpoints like chromosome aberrations, micronuclei, mitotic index, sperm head abnormality and biochemical protocols like acid and alkaline phosphatases, aspartate and alanine aminotransferases, reduced glutathione, lipid peroxidation, catalase and succinate dehydrogenase were studied at 30, 60, 90 and 120 days. RESULTS: Compared to controls, chromosome aberrations, micronuclei, sperm head abnormality frequencies and activities of acid and alkaline phosphatases, aspartate and alanine aminotransferases and lipid peroxidation were reduced in both drug-fed series, while mitotic index and activities of glutathione, catalase and succinate dehydrogenase were increased. Ars Alb 30C showed marginally better efficacy than Ars Alb 6C. CONCLUSION: Both remedies indicated potentials of use against arsenic intoxication.


Subject(s)
Arsenic Poisoning/drug therapy , Arsenic Poisoning/etiology , Arsenicals/therapeutic use , Materia Medica/therapeutic use , Oxides/adverse effects , Acid Phosphatase/metabolism , Alkaline Phosphatase , Animals , Arsenic Poisoning/physiopathology , Arsenic Trioxide , Arsenicals/administration & dosage , Arsenicals/adverse effects , Catalase/metabolism , Chromosome Aberrations , Chronic Disease , Dose-Response Relationship, Drug , Drug Evaluation, Preclinical , Female , Glutathione , Lipid Metabolism , Male , Materia Medica/administration & dosage , Mice , Mitotic Index , Spermatozoa/pathology , Succinate Dehydrogenase/metabolism , Transaminases/metabolism , Treatment Outcome
2.
Zhong Yao Cai ; 31(2): 245-8, 2008 Feb.
Article in Zh | MEDLINE | ID: mdl-18619270

ABSTRACT

OBJECTIVE: To evaluate the therapy action of Sal-Ammoniac extract on Lewis lung cancer and its toxicity to immunity. METHODS: The proliferation and cell cycle of Lewis lung cancer cells were determined by MTT assay and flow cytometry respectively. The antitumor effect of Sal-Ammoniac extract was observed by tumor injected subcutaneously in mice and its toxicity to immunity was examined by clearance rate of charcoal particles and delayed type hypersensitivity. RESULTS: Sal-Ammoniac extract could inhibit the proliferation of Lewis lung cancer cells with S cell cycle arrest in a dose-dependent manner in vitro. Sal-Ammoniac extract solution injected in tumor for eight days had 46.7% inhibition on Lewis lung cancer, if taken orally had only 15.7% inhibition on Lewis lung cancer in mice. Sal-Ammoniac extract solution injected subcutaneously or taken orally had no effect on the clearance rate of charcoal particles and delayed type hypersensitivity in mice. CONCLUSION: The antitumor action of Sal-Ammoniac extract has relation to its recipe and has no influence on immunity.


Subject(s)
Ammonium Chloride/pharmacology , Antineoplastic Agents/pharmacology , Carcinoma, Lewis Lung/drug therapy , Materia Medica/pharmacology , Ammonium Chloride/administration & dosage , Animals , Antineoplastic Agents/administration & dosage , Carcinoma, Lewis Lung/pathology , Cell Cycle/drug effects , Cell Line, Tumor , Cell Proliferation/drug effects , Dose-Response Relationship, Drug , Drug Evaluation, Preclinical , Female , Flow Cytometry , Materia Medica/administration & dosage , Mice , Mice, Inbred C57BL
3.
Int J Oncol ; 47(2): 573-82, 2015 Aug.
Article in English | MEDLINE | ID: mdl-26095308

ABSTRACT

Adverse side effects of chemotherapy during cancer treatment have shifted considerable focus towards therapies that are not only targeted but are also devoid of toxic side effects. We evaluated the antitumorigenic activity of sulphur, and delineated the molecular mechanisms underlying sulphur-induced apoptosis in non-small cell lung carcinoma (NSCLC) cells. A search for the underlying mechanism revealed that the choice between the two cellular processes, NFκBp65-mediated survival and p53-mediated apoptosis, was decided by the competition for a limited pool of transcriptional coactivator protein p300 in NSCLC cells. In contrast, sulphur inhibited otherwise upregulated survival signaling in NSCLC cells by perturbing the nuclear translocation of p65NFκB, its association with p300 histone acetylase, and subsequent transcription of Bcl-2. Under such anti-survival condition, induction of p53-p300 cross-talk enhanced the transcriptional activity of p53 and intrinsic mitochondrial death cascade. Overall, the findings of this preclinical study clearly delineated the molecular mechanism underlying the apoptogenic effect of the non-toxic homeopathic remedy, sulphur, in NSCLC cells.


Subject(s)
Antineoplastic Agents/pharmacology , Carcinoma, Non-Small-Cell Lung/metabolism , E1A-Associated p300 Protein/metabolism , Lung Neoplasms/metabolism , NF-kappa B/metabolism , Sulfur/pharmacology , Tumor Suppressor Protein p53/metabolism , Apoptosis , Carcinoma, Non-Small-Cell Lung/drug therapy , Carcinoma, Non-Small-Cell Lung/genetics , Cell Line, Tumor , Cell Survival/drug effects , Drug Evaluation, Preclinical , E1A-Associated p300 Protein/genetics , Gene Expression Regulation, Neoplastic/drug effects , Humans , Lung Neoplasms/drug therapy , Lung Neoplasms/genetics , NF-kappa B/genetics , Signal Transduction/drug effects , Tumor Suppressor Protein p53/genetics
4.
Am J Chin Med ; 21(1): 7-16, 1993.
Article in English | MEDLINE | ID: mdl-8328424

ABSTRACT

The effects of "Kyushin" (KY), a Senso (toad venom)-containing drug, on the cardiovascular system were examined by intraduodenal administration of KY in anesthetized open-chest dogs. KY (3 or 10 mg/kg) dose-dependently increased the peak positive first derivative of left ventricular pressure ((+)LVdP/dt) and mean aortic pressure, and decreased the left ventricular end-diastolic pressure (LVEDP). Myocardial oxygen consumption (MVO2) and heart rate (HR) were not significantly influenced by KY. KY produced a cardiotonic effect without any increase in MVO2, because the increase in MVO2 due to the cardiotonic effect of KY may have been cancelled by a decrease in MVO2 due to reduction of preload and the lack of increase in HR. In order to clarify the relationship between the cardiovascular effects of KY and the drug concentration in plasma, the concentration of anti-bufalin IgG reactive substance (BRS) in plasma was measured by enzyme immunoassay. The maximum BRS concentrations 20 min after administration of 3 and 10 mg/kg KY were dose-dependent. From the relationship between changes in (+)LVdP/dt and changes in BRS concentration after administration of KY, it is inferred that the effective concentration of BRS in plasma at which KY produces a cardiotonic effect in dogs is approximately 2-3 ng/ml.


Subject(s)
Bufanolides/pharmacology , Heart/drug effects , Hemodynamics/drug effects , Materia Medica/pharmacology , Oxygen Consumption/drug effects , Anesthesia , Animals , Dogs , Dose-Response Relationship, Drug , Drug Evaluation, Preclinical , Duodenum , Female , Immunoenzyme Techniques , Immunoglobulin G/blood , Intubation, Gastrointestinal , Male
5.
Am J Chin Med ; 21(1): 17-31, 1993.
Article in English | MEDLINE | ID: mdl-8328419

ABSTRACT

A study was conducted on the pharmacological actions of the toad venom-containing drug "Kyushin" (KY-2 and KY-R) on urinary volume and electrolytes excretion, regional blood flow, renal artery blood flow and carrageenin-induced hind-paw edema. In rabbits, KY-2 and KY-R significantly increased urinary volume after intravenous administration of 8 mg/kg. In guinea pigs, KY-2 and KY-R produced a significant increase in urinary volume after intraduodenal administration (i.d.) of 80 mg/kg. In guinea pigs treated with propranolol, KY-2 at 20 and 40 mg/kg p.o. and KY-R at 40 mg/kg p.o. increased urinary volume. At 40 mg/kg i.d. both KY-2 and KY-R produced an increase in regional blood flow, as determined by the hydrogen gas clearance method, of the brain areas including the amygdaloid nucleus, but did not affect regional blood flow in liver, kidney and skeletal muscle, or renal artery blood flow. In rats, carrageenin-induced hind-paw edema was inhibited by KY-2 or KY-R at 600 mg/kg p.o.


Subject(s)
Bufanolides/pharmacology , Edema/drug therapy , Electrolytes/urine , Hemodynamics/drug effects , Materia Medica/pharmacology , Renal Circulation/drug effects , Urine , Animals , Carrageenan , Digoxin/pharmacology , Drug Evaluation, Preclinical , Duodenum , Edema/chemically induced , Guinea Pigs , Injections, Intravenous , Intubation, Gastrointestinal , Liver/blood supply , Male , Muscles/blood supply , Propranolol/pharmacology , Rabbits , Rats , Rats, Wistar , Renal Artery/physiology
6.
Indian J Exp Biol ; 42(7): 698-714, 2004 Jul.
Article in English | MEDLINE | ID: mdl-15339035

ABSTRACT

Several cytogenetical and enzymatic protocols were used to test if two microdoses of Chelidonium majus, namely Chelidonium-30 (Ch-30) and Chelidonium-200 (Ch-200), used as homeopathic drugs, showed anti-tumor activity and also favorably modulated genotoxic damages produced by an azo dye in mice at several intervals of fixation. Different sets of healthy mice were fed: (i) hepatocarcinogen, p-dimethylaminoazobenzene (p-DAB, initiator) + phenobarbital (PB, promoter), (ii) only p-DAB, (iii) only PB, and (iv) neither p-DAB nor PB (normal control). Mice fed with p-DAB + PB were divided into different sets that were also fed either Ch-30 (v) or Ch-200 (vi) or diluted alcohol (vii), the "vehicle" of the microdoses of Chelidonium. All mice of group (i), a few of group (ii) and group (vii) and none of groups (iii) and (iv) developed tumors in liver at the longer intervals of fixation. The frequencies of chromosome aberrations (CA), micronucleated erythrocytes (MN), mitotic index (MI) and sperm head abnormality (SHA) were much higher in groups (i) and (vii) mice than in groups (ii), (iii) and (iv) mice at all fixation intervals. However, in mice of both groups (v) and (vi), the frequencies of CA, MN, SHA were strikingly less than those of groups (i) and (vii), and moderately less than those of groups (ii) and (iii). Both Ch-30 and Ch-200 also modulated favourably some toxicity marker enzymes like acid and alkaline phosphatases, peroxidases, glutamate oxaloacetate and glutamate pyruvate transaminases in liver, kidney and spleen tissues of the carcinogen fed mice. The microdoses of Chelidonium having no visible ill effects of their own, may be strong candidates for use in delaying/protecting liver cancer.


Subject(s)
Azo Compounds/toxicity , Carcinogens/toxicity , Chelidonium/chemistry , Coloring Agents/toxicity , Homeopathy , Liver Neoplasms, Experimental/drug therapy , Animals , Drug Evaluation, Preclinical , Liver Neoplasms, Experimental/chemically induced , Liver Neoplasms, Experimental/metabolism , Liver Neoplasms, Experimental/pathology , Mice , Micronucleus Tests
7.
Vopr Onkol ; 31(3): 84-8, 1985.
Article in Russian | MEDLINE | ID: mdl-3992964

ABSTRACT

Treatment with such analgetics as analginum, promedol and pantopon was shown experimentally either to inhibit or to stimulate the growth of sarcoma-37 and its dissemination. It was also found to reduce the tumor growth--stimulating effect of operative trauma.


Subject(s)
Analgesics/therapeutic use , Sarcoma 37/drug therapy , Sarcoma, Experimental/drug therapy , Amputation, Surgical , Animals , Dipyrone/therapeutic use , Drug Evaluation, Preclinical , Female , Lung Neoplasms/drug therapy , Lung Neoplasms/physiopathology , Lung Neoplasms/secondary , Mice , Neoplasm Transplantation , Opium/therapeutic use , Promedol/therapeutic use , Sarcoma 37/physiopathology , Time Factors
8.
Int. j. high dilution res ; 18(3/4): 35-46, 2019.
Article in English | LILACS, HomeoIndex (homeopathy) | ID: biblio-1050038

ABSTRACT

Background ­ Diabetes Mellitus a metabolic disorder affects the secretion of insulin from pancreas leading to hyperglycemia, if uncontrolled leads to complications triggered by free radical formed after oxidative stress. Homeopathic medicine Cephalandra Indica has shown antidiabetic activity in various potencies performed on preclinical studies on diabetic rat model. The present review highlights the pharmacological profile of homeopathic preparations Cephalandra Indica on preclinical studies and calculating the probable human equivalent dosage from preclinical studies for the pilot studies. Method ­ Articles published between January 1988 and December 2018 was included in review. Databases like PubMed ­ Medline, Google scholar were used for collecting the articles. Keywords like 'Homeopathy' or 'Homoeopathy', 'Invitro', 'Invivo' and 'Cephalandra Indica' were used. SABEH criteria were implemented for assessing methodology quality of articles. Results ­ Seven full text articles were included in review which had six Invivo studies and one Invitro study. This review article provided the scientific validation of high diluted homeopathic medicines pharmacological activity of Cephalandra Indica and probable mechanism of action confirmed through preclinical studies. Conversion of dosage from animal model to human dosage for pilot studies has been hypothetically proposed. Conclusion ­ Homeopathic medicine Cephalandra Indica has a therapeutic and safety profile with no toxicity observed in preclinical studies. The proposed hypothesis of conversion of dosage needs to be validated for further studies. (au)


Subject(s)
Diabetes Mellitus , Drug Evaluation, Preclinical , Homeopathy , Bryonia
9.
Chin J Integr Med ; 19(4): 243-52, 2013 Apr.
Article in English | MEDLINE | ID: mdl-23546627

ABSTRACT

To provide a better service for senior health care, we summarized screening studies of traditional Chinese anti-aging materia medica (TCAM). We collected and analyzed literature of TCAM screening studies using the lifespan test and animal models of aging from 1984 to 2012. We found 26 screening methods for TCAM, and 153 single herbs or active ingredients of TCAM that have been screened out during the past 28 years. The cell lifespan test, the fruit fly lifespan test, and D-galactose aging model were the most widely used and intensively studied screening methods. However, the method for establishing the D-galactose aging model needs to be standardized, and the D-galactose aging model cannot completely be a substitute for the normal aging mouse model. Great success has been achieved in screening studies in TCAM. To further improve screening studies in TCAM, we suggest that the D-galactose aging model be incorporated into the lifespan test in the New Drugs of Traditional Chinese Medicine Research Guide.


Subject(s)
Aging/drug effects , Drug Evaluation, Preclinical , Drugs, Chinese Herbal/pharmacology , Materia Medica/pharmacology , Medicine, Chinese Traditional , Animals , Humans , Models, Animal
10.
Environ Toxicol Pharmacol ; 35(2): 325-34, 2013 Mar.
Article in English | MEDLINE | ID: mdl-23434523

ABSTRACT

The medicinal plants Aristolochia clematitis L. as well as Asarum europaeum L., representatives of the plant family Aristolochiaceae and mentioned in the German Homeopathic Pharmacopeia, contain aristolochic acid. We found that the mother tinctures of A. clematitis and A. europaeum inhibited DNA synthesis in human hepatoma HepG2 cells in a dose-dependent manner. One of the components of the plant extract, aristolochic acid I (AAI), is linked to the development of nephropathy and urothelial cancer in humans. Therefore, we also evaluated the cytotoxicity and genotoxicity of AAI in HepG2 cells. Cell proliferation was inhibited concentration-dependently by AAI using BrdU-ELISA and colony forming assay. AAI formed DNA adducts (measured by (32)P-postlabeling), induced chromosomal aberrations (micronuclei) and DNA strand breaks. DNA damage induced by AAI led to an arrest of cells in the S-phase which was associated with the increased expression of p53 and p21 proteins. The results are discussed under consideration of former studies.


Subject(s)
Aristolochiaceae/chemistry , Aristolochic Acids/toxicity , Cell Line, Tumor/drug effects , Cell Line, Tumor/metabolism , Cell Proliferation/drug effects , Cell Survival/drug effects , DNA Adducts/analysis , DNA Damage/drug effects , Dose-Response Relationship, Drug , Drug Evaluation, Preclinical , Homeopathy/methods , Humans , Mutagenicity Tests/methods , NAD(P)H Dehydrogenase (Quinone)/metabolism , Plant Extracts/chemistry , Plant Extracts/toxicity , S Phase Cell Cycle Checkpoints/drug effects
11.
Integr Cancer Ther ; 12(5): 433-41, 2013 Sep.
Article in English | MEDLINE | ID: mdl-23615751

ABSTRACT

OBJECTIVE: Ethanolic extract of Gymnema sylvestre (GS) leaves is used as a potent antidiabetic drug in various systems of alternative medicine, including homeopathy. The present study was aimed at examining if GS also had anticancer potentials, and if it had, to elucidate its possible mechanism of action. METHODS: We initially tested possible anticancer potential of GS on A375 cells (human skin melanoma) through MTT assay and determined cytotoxicity levels in A375 and normal liver cells; we then thoroughly studied its apoptotic effects on A375 cells through protocols such as Hoechst 33258, H2DCFDA, and rhodamine 123 staining and conducted ELISA for cytochrome c, caspase 3, and PARP activity levels; we determined the mRNA level expression of cytochrome c, caspase 3, Bcl2, Bax, PARP, ICAD, and EGFR signaling genes through semiquantitative reverse transcriptase polymerase chain reaction and conducted Western blot analysis of caspase 3 and PARP. We also analyzed cell cycle events, determined reactive oxygen species accumulation, measured annexin V-FITC/PI and rhodamine 123 intensity by flow cytometry. RESULTS: Compared with both normal liver cells and drug-untreated A375, the mortality of GS-treated A375 cells increased in a dose-dependent manner. Additionally, GS induced nuclear DNA fragmentation and showed an increased level of mRNA expression of apoptotic signal related genes cytochrome c, caspase 3, PARP, Bax, and reduced expression level of ICAD, EGFR, and the anti-apoptotic gene Bcl2. CONCLUSION: Overall results indicate GS to have significant anticancer effect on A375 cells apart from its reported antidiabetic effect, indicating possibility of its palliative use in patients with symptoms of both the diseases.


Subject(s)
Antineoplastic Agents/pharmacology , Caspase 3/metabolism , Gymnema sylvestre , Melanoma/pathology , Plant Extracts/pharmacology , Reactive Oxygen Species/metabolism , Skin Neoplasms/pathology , Cell Survival/drug effects , Cells, Cultured , Drug Evaluation, Preclinical , Humans , Hypoglycemic Agents/pharmacology , Melanoma/metabolism , Mitochondria/drug effects , Mitochondria/metabolism , Signal Transduction/drug effects , Skin Neoplasms/metabolism
12.
Forsch Komplementmed ; 18(2): 91-6, 2011.
Article in German | MEDLINE | ID: mdl-21576978

ABSTRACT

For more than 200 years, homeopathic doctors have been carrying out homeopathic drug provings (HDPs),which embodies the traditional self drug testing, an integral part of the homeopathic medical profession. However,according to national authorities, testing homeopathic drugs is a phase I clinical trial for which the German Federal Drug Law applies. Adapting a 200-year-old primary qualitative study design to modern drug law and Good Clinical Practice Guidelines generates several difficulties, in particular, blinding, informed consent and the classification of adverse events. In addition, in Germany naturopaths (German: 'Heilpraktiker') are excluded from leading HDP trials. The costs are climbing, and the organizational over heads for a HDP are enormous. Implications for the future are discussed.


Subject(s)
Drug Evaluation, Preclinical , Homeopathy/legislation & jurisprudence , Homeopathy/methods , Clinical Trials, Phase I as Topic , Drug Evaluation, Preclinical/economics , Germany , Humans
14.
Soc Hist Med ; 15(3): 481-504, 2002 Dec.
Article in English | MEDLINE | ID: mdl-12659098

ABSTRACT

In 1941 a proposal was made to Nazi SS Reichsführer, Heinrich Himmler, that extracts of a South American plant, Dieffenbachia seguine, might be used for the mass sterilization of racially undesirable war prisoners. The proposal was based on published animal fertility research conducted by Dr Gerhard Madaus, co-founder of a firm that produced and marketed natural medicinals. His fertility experiments were part of a broader series aimed at evaluating the scientific validity of ethnobotanical folk-knowledge. This article traces the historical background to the Madaus research: first, the role of homeopathy in the introduction of Dieffenbachias to western medicine; secondly, the social context of German 'alternative' medicine in the interwar period; and finally, the role of Madaus himself, whose homeopathically-oriented research on botanical medicinals inadvertently initiated the chain of events described here.


Subject(s)
Abortion, Eugenic/history , Drug Evaluation, Preclinical/history , Homeopathy/history , National Socialism/history , Politics , Sterilization, Involuntary/history , War Crimes/history , Germany , History, 20th Century
15.
Anesth Analg ; 55(5): 643-53, 1976.
Article in English | MEDLINE | ID: mdl-987720

ABSTRACT

Fifty-three swine from the University of Missouri Sinclair Medical Research Farm were used in experimentation to determine their susceptibility to malignant hyperthermia, to determine appropriate anesthetic agents for susceptible swine and to investigate appropriate pharmaceutical agents which could protect against the development of malignant hyperthermia. The screening technics used were successful in determining susceptible animals to MH and the anesthesia studies indicated that dissociative anesthetics had less tendency to trigger MH than did halothane and pancuronium was shown to have greater safety as a muscle relaxant than succinylcholine in this group of pigs. Pigs pretreated with reserpine had less tendency to develop symptoms of MH and some were completely protected. The principle undesirable effect was the development of hypotension if sufficient reserpine was used to provide total protection.


Subject(s)
Anesthetics/adverse effects , Disease Models, Animal , Malignant Hyperthermia/prevention & control , Preoperative Care , Animals , Drug Evaluation, Preclinical , Halothane/pharmacology , Humans , Malignant Hyperthermia/etiology , Methyldopa/pharmacology , Pancuronium/pharmacology , Patient Care Planning , Preanesthetic Medication , Reserpine/therapeutic use , Succinylcholine/pharmacology , Swine
16.
J Matern Fetal Med ; 6(4): 195-9, 1997.
Article in English | MEDLINE | ID: mdl-9260114

ABSTRACT

Currently little is known about the cardiovascular responses of the anemic fetus to neuromuscular blockade. We hypothesized that, despite marked anemia with potentially decreased cardiac reserve, the fetal responses to Pancuronium neuromuscular blockade would differ significantly when compared with neuromuscular blockade with Atracurium (a cardiovascular sparing agent). Ten fetal sheep (137 +/- 1 (SE) days gestation) were divided into three groups (21 experiments): Pancuronium (n = 7), Atracurium (n = 6), and Control (n = 8). Fetal anemia (Hct = 21.8 +/- 0.7%) was produced by serial hemorrhage over 3 days. Fetal arterial (FAP) and venous (FVP) pressures, heart rate (FHR), and arterial pH, pO2, and pCO2 were measured at -20, 0, 10, 20, 30, 60, and 90 minutes relative to neuromuscular blockade. Data were analyzed by three-way ANOVA for repeated measures. Pancuronium neuromuscular blockade increased FHR (15-20 bpm, P < .0001) and decreased FVP (-0.8 mm Hg, P < .0001). Atracurium had no effect on FHR, FAP, or FVP. Fetal pH (0.024, P < .0001) and pO2 (1-2 mm Hg, P = .0001) increased in both neuromuscular-blocked groups. Fetal pCO2 decreased in the Pancuronium-blocked animals (P = .02). We conclude that, in anemic fetuses, neuromuscular blockade with Atracurium produced minimal cardiovascular effects when compared to neuromuscular blockade with Pancuronium. Both agents produced small improvements in fetal pH and blood gases.


Subject(s)
Anemia/etiology , Atracurium/pharmacology , Cardiovascular System/drug effects , Neuromuscular Nondepolarizing Agents/pharmacology , Pancuronium/pharmacology , Analysis of Variance , Animals , Drug Evaluation, Preclinical , Embryonic and Fetal Development/drug effects , Gestational Age , Heart Rate/drug effects , Hydrogen-Ion Concentration , Sheep
17.
J Chem Inf Comput Sci ; 44(2): 480-8, 2004.
Article in English | MEDLINE | ID: mdl-15032527

ABSTRACT

Virtual screening of large libraries of organic compounds combined with pharmacological high throughput screening is widely used for drug discovery in the pharmaceutical industry. Our aim was to explore the efficiency of using a biased 3D database comprising secondary metabolites from antiinflammatory medicinal plants as a source for the virtual screening. For this study pharmacophore models of cyclooxygenase I and II (COX-1, COX-2), key enzymes in the inflammation process, were generated with structure-based as well as common feature based modeling, resulting in three COX hypotheses. Four different multiconfomational 3D databases limited in molecular weight between 300 and 700 Da were applied to the screening in order to compare and analyze the obtained hit rates. Two of them were created in-house (DIOS, NPD). The database DIOS consists of 2752 compounds from phytochemical reports of antiinflammatory medicinal plants described by the ethnopharmacological source 'De material medica' of Pedanius Dioscorides, whereas NPD contains almost 80,000 compounds gathered arbitrarily from natural sources. In addition, two available multiconformational 3D libraries comprising marketed and development drug substances (DWI and NCI), mainly originating from synthesis, were used for comparison. As a test of the pharmacophore models' capability in natural sources, the models were used to search for known COX inhibitory natural products. This was achieved with some exceptions, which are discussed in the paper. Depending on the hypothesis used, DWI and NCI library searches produced hit rates in the range of 6.6% to 13.7%. A slight increase of the number of molecules assessed for binding was achieved with the database of natural products (NPD). Using the biased 3D database DIOS, however, the average increase of efficiency reached 77% to 133% compared to the hit rates resulting from WDI and NCI. The statistical benefit of a combination of an ethnopharmacological approach with the potential of computer aided drug discovery by in silico screening was demonstrated exemplified on the applied targets COX-1 and COX-2.


Subject(s)
Cyclooxygenase Inhibitors/pharmacology , Drug Evaluation, Preclinical/methods , Ethnopharmacology , Computer Simulation , Cyclooxygenase 1 , Cyclooxygenase 2 , Cyclooxygenase 2 Inhibitors , Cyclooxygenase Inhibitors/chemistry , Databases, Protein , Drug Design , Isoenzymes/chemistry , Isoenzymes/drug effects , Materia Medica , Models, Molecular , National Institutes of Health (U.S.) , Prostaglandin-Endoperoxide Synthases/chemistry , Prostaglandin-Endoperoxide Synthases/drug effects , Protein Conformation , United States
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