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  • Articles  (31)
  • Dose-Response Relationship, Drug
  • American Association for the Advancement of Science (AAAS)  (31)
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  • Science. 219(4582): 236-8.  (1)
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  • Biology  (31)
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  • Articles  (31)
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  • American Association for the Advancement of Science (AAAS)  (31)
  • American Geophysical Union
  • American Meteorological Society
  • American Physical Society (APS)
  • International Union of Crystallography (IUCr)
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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1998-10-09
    Description: Differential access to cocaine self-administration produced two patterns of drug intake in rats. With 1 hour of access per session, drug intake remained low and stable. In contrast, with 6 hours of access, drug intake gradually escalated over days. After escalation, drug consumption was characterized by an increased early drug loading and an upward shift in the cocaine dose-response function, suggesting an increase in hedonic set point. After 1 month of abstinence, escalation of cocaine intake was reinstated to a higher level than before. These findings may provide an animal model for studying the development of excessive drug intake and the basis of addiction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ahmed, S H -- Koob, G F -- DA04398/DA/NIDA NIH HHS/ -- DA08467/DA/NIDA NIH HHS/ -- New York, N.Y. -- Science. 1998 Oct 9;282(5387):298-300.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Psychopharmacology, Department of Neuropharmacology, CVN-7, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA. aserge@sage.scripps.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9765157" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Behavior, Addictive ; Cocaine/*administration & dosage ; Cocaine-Related Disorders/*etiology ; Dose-Response Relationship, Drug ; Drug Tolerance ; Male ; Rats ; Rats, Wistar ; Reinforcement (Psychology) ; Time Factors
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  • 2
    Publication Date: 1998-12-18
    Description: Cocaine regulates the transcription factor CREB (adenosine 3', 5'-monophosphate response element binding protein) in rat nucleus accumbens, a brain region that is important for addiction. Overexpression of CREB in this region decreases the rewarding effects of cocaine and makes low doses of the drug aversive. Conversely, overexpression of a dominant-negative mutant CREB increases the rewarding effects of cocaine. Altered transcription of dynorphin likely contributes to these effects: Its expression is increased by overexpression of CREB and decreased by overexpression of mutant CREB. Moreover, blockade of kappa opioid receptors (on which dynorphin acts) antagonizes the negative effect of CREB on cocaine reward. These results identify an intracellular cascade-culminating in gene expression-through which exposure to cocaine modifies subsequent responsiveness to the drug.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carlezon, W A Jr -- Thome, J -- Olson, V G -- Lane-Ladd, S B -- Brodkin, E S -- Hiroi, N -- Duman, R S -- Neve, R L -- Nestler, E J -- New York, N.Y. -- Science. 1998 Dec 18;282(5397):2272-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Psychiatry, Center for Genes and Behavior, Yale University School of Medicine and Connecticut Mental Health Center, New Haven, CT 06508, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9856954" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cocaine/administration & dosage/*pharmacology ; Conditioning (Psychology) ; Cyclic AMP Response Element-Binding Protein/genetics/*metabolism ; Dose-Response Relationship, Drug ; Dynorphins/genetics/metabolism ; Gene Expression ; Gene Expression Regulation ; Gene Transfer Techniques ; Genetic Vectors ; Naltrexone/analogs & derivatives/pharmacology ; Narcotic Antagonists/pharmacology ; Neurons/metabolism ; Nucleus Accumbens/*metabolism ; Point Mutation ; RNA, Messenger/genetics/metabolism ; Rats ; Receptors, Opioid, kappa/antagonists & inhibitors/metabolism ; *Reward ; Simplexvirus/genetics
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  • 3
    Publication Date: 1998-10-02
    Description: To better understand the dynamics of hepatitis C virus and the antiviral effect of interferon-alpha-2b (IFN), viral decline in 23 patients during therapy was analyzed with a mathematical model. The analysis indicates that the major initial effect of IFN is to block virion production or release, with blocking efficacies of 81, 95, and 96% for daily doses of 5, 10, and 15 million international units, respectively. The estimated virion half-life (t1/2) was, on average, 2.7 hours, with pretreatment production and clearance of 10(12) virions per day. The estimated infected cell death rate exhibited large interpatient variation (corresponding t1/2 = 1.7 to 70 days), was inversely correlated with baseline viral load, and was positively correlated with alanine aminotransferase levels. Fast death rates were predictive of virus being undetectable by polymerase chain reaction at 3 months. These findings show that infection with hepatitis C virus is highly dynamic and that early monitoring of viral load can help guide therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Neumann, A U -- Lam, N P -- Dahari, H -- Gretch, D R -- Wiley, T E -- Layden, T J -- Perelson, A S -- A1/DK41320-2/DK/NIDDK NIH HHS/ -- A139049-2/PHS HHS/ -- RR06555/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 1998 Oct 2;282(5386):103-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Life Sciences, Bar-Ilan University, Ramat-Gan 52900, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9756471" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine Transaminase/blood ; Antiviral Agents/administration & dosage/*therapeutic use ; Cell Death ; Dose-Response Relationship, Drug ; Half-Life ; Hepacivirus/*physiology ; Hepatitis C/immunology/*therapy/*virology ; Humans ; Interferon-alpha/administration & dosage/*therapeutic use ; Kinetics ; Models, Biological ; RNA, Viral/blood ; Recombinant Proteins ; Regression Analysis ; Viral Load ; Viremia/virology ; Virion/physiology ; Virus Replication
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  • 4
    Publication Date: 1998-10-23
    Description: Patients with abetalipoproteinemia, a disease caused by defects in the microsomal triglyceride transfer protein (MTP), do not produce apolipoprotein B-containing lipoproteins. It was hypothesized that small molecule inhibitors of MTP would prevent the assembly and secretion of these atherogenic lipoproteins. To test this hypothesis, two compounds identified in a high-throughput screen for MTP inhibitors were used to direct the synthesis of a highly potent MTP inhibitor. This molecule (compound 9) inhibited the production of lipoprotein particles in rodent models and normalized plasma lipoprotein levels in Watanabe-heritable hyperlipidemic (WHHL) rabbits, which are a model for human homozygous familial hypercholesterolemia. These results suggest that compound 9, or derivatives thereof, has potential applications for the therapeutic lowering of atherogenic lipoprotein levels in humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wetterau, J R -- Gregg, R E -- Harrity, T W -- Arbeeny, C -- Cap, M -- Connolly, F -- Chu, C H -- George, R J -- Gordon, D A -- Jamil, H -- Jolibois, K G -- Kunselman, L K -- Lan, S J -- Maccagnan, T J -- Ricci, B -- Yan, M -- Young, D -- Chen, Y -- Fryszman, O M -- Logan, J V -- Musial, C L -- Poss, M A -- Robl, J A -- Simpkins, L M -- Slusarchyk, W A -- Sulsky, R -- Taunk, P -- Magnin, D R -- Tino, J A -- Lawrence, R M -- Dickson, J K Jr -- Biller, S A -- New York, N.Y. -- Science. 1998 Oct 23;282(5389):751-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Metabolic Diseases, Bristol-Myers Squibb Pharmaceutical Research Institute, Princeton, NJ 08543-4000, USA. Wetterau_John_R@msmail.bms.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9784135" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine Transaminase/blood ; Animals ; Apolipoproteins B/*blood ; Aspartate Aminotransferases/blood ; Carrier Proteins/*antagonists & inhibitors ; Cholesterol/*blood ; Cricetinae ; Disease Models, Animal ; Dose-Response Relationship, Drug ; Drug Design ; Drug Evaluation, Preclinical ; Fluorenes/chemistry/pharmacokinetics/*pharmacology ; Humans ; Hyperlipidemias/blood/drug therapy ; Hyperlipoproteinemia Type II/*blood/drug therapy ; Lipids/blood ; Lipoproteins/blood ; Liver/metabolism ; Mice ; Piperidines/chemistry/pharmacokinetics/*pharmacology ; Rabbits ; Rats ; Triglycerides/*blood/metabolism ; Tumor Cells, Cultured
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  • 5
    Publication Date: 1998-01-24
    Description: Development of analgesic agents for the treatment of severe pain requires the identification of compounds that are devoid of opioid receptor liabilities. A potent (inhibition constant = 37 picomolar) neuronal nicotinic acetylcholine receptor (nAChR) ligand called ABT-594 was developed that has antinociceptive properties equal in efficacy to those of morphine across a series of diverse animal models of acute thermal, persistent chemical, and neuropathic pain states. These effects were blocked by the nAChR antagonist mecamylamine. In contrast to morphine, repeated treatment with ABT-594 did not appear to elicit opioid-like withdrawal or physical dependence. Thus, ABT-594 may be an analgesic that lacks the problems associated with opioid analgesia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bannon, A W -- Decker, M W -- Holladay, M W -- Curzon, P -- Donnelly-Roberts, D -- Puttfarcken, P S -- Bitner, R S -- Diaz, A -- Dickenson, A H -- Porsolt, R D -- Williams, M -- Arneric, S P -- New York, N.Y. -- Science. 1998 Jan 2;279(5347):77-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Neurological and Urological Diseases Research, Pharmaceutical Products Division, Abbott Laboratories, Abbott Park, IL 60064-3500, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9417028" target="_blank"〉PubMed〈/a〉
    Keywords: Analgesics, Non-Narcotic/chemical synthesis/metabolism/*pharmacology ; Animals ; Azetidines/chemical synthesis/metabolism/*pharmacology ; Bicyclo Compounds, Heterocyclic/pharmacology ; Capsaicin/pharmacology ; Dose-Response Relationship, Drug ; In Vitro Techniques ; Ligands ; Mecamylamine/pharmacology ; Morphine/pharmacology ; Nerve Fibers/drug effects/metabolism/physiology ; Neuromuscular Junction/metabolism ; Neurons/drug effects/metabolism/physiology ; Nicotine/pharmacology ; Nicotinic Agonists/chemical synthesis/metabolism/*pharmacology ; Nicotinic Antagonists/pharmacology ; Pain/drug therapy ; Pain Measurement ; Pyridines/chemical synthesis/metabolism/*pharmacology ; Rats ; Receptors, Nicotinic/*metabolism ; Spinal Cord/drug effects/metabolism/physiology ; Substance Withdrawal Syndrome/etiology ; Synaptic Transmission/drug effects
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  • 6
    Publication Date: 1998-11-06
    Description: Adenosine triphosphate (ATP)-sensitive potassium (KATP) channels couple electrical activity to cellular metabolism through their inhibition by intracellular ATP. ATP inhibition of KATP channels varies among tissues and is affected by the metabolic and regulatory state of individual cells, suggesting involvement of endogenous factors. It is reported here that phosphatidylinositol-4, 5-bisphosphate (PIP2) and phosphatidylinositol-4-phosphate (PIP) controlled ATP inhibition of cloned KATP channels (Kir6.2 and SUR1). These phospholipids acted on the Kir6.2 subunit and shifted ATP sensitivity by several orders of magnitude. Receptor-mediated activation of phospholipase C resulted in inhibition of KATP-mediated currents. These results represent a mechanism for control of excitability through phospholipids.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baukrowitz, T -- Schulte, U -- Oliver, D -- Herlitze, S -- Krauter, T -- Tucker, S J -- Ruppersberg, J P -- Fakler, B -- New York, N.Y. -- Science. 1998 Nov 6;282(5391):1141-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology II, University of Tubingen, Gmelinstrasse 5, 72076 Tubingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9804555" target="_blank"〉PubMed〈/a〉
    Keywords: *ATP-Binding Cassette Transporters ; Adenosine Triphosphate/metabolism/*pharmacology ; Animals ; Cloning, Molecular ; Diazoxide/pharmacology ; Dose-Response Relationship, Drug ; Mutation ; Oocytes ; Patch-Clamp Techniques ; Phosphatidylinositol 4,5-Diphosphate/metabolism/*pharmacology ; Phosphatidylinositol Phosphates/metabolism/*pharmacology ; Phosphatidylinositols/pharmacology ; *Potassium Channel Blockers ; Potassium Channels/genetics/metabolism ; *Potassium Channels, Inwardly Rectifying ; Receptors, Drug/metabolism ; Receptors, Purinergic P2/metabolism ; Receptors, Purinergic P2Y2 ; Recombinant Fusion Proteins/metabolism ; Sulfonylurea Receptors ; Type C Phospholipases/metabolism ; Xenopus laevis
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1983-09-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉New York, N.Y. -- Science. 1983 Sep 23;221(4617):1244-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6684327" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Dose-Response Relationship, Drug ; Ethanol/*adverse effects ; Female ; Pregnancy ; Pregnancy, Animal/*drug effects
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  • 8
    Publication Date: 1983-04-29
    Description: Selective pharmacological inhibition of thromboxane A2 synthesis did not prevent arachidonate-induced aggregation of human platelets in vitro. Prevention was instead achieved by a combination of thromboxane A2 inhibitors with low concentrations of aspirin. The latter partially reduced the proaggregatory cyclooxygenase products that accumulated when thromboxane A2 synthesis was blocked. The aspirin concentrations did not affect per se either platelet aggregation or prostacyclin synthesis in cultured human endothelial cells. The combination of thromboxane synthetase inhibitors with low doses of aspirin may offer greater antithrombotic potential than either drug alone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bertele, V -- Falanga, A -- Tomasiak, M -- Dejana, E -- Cerletti, C -- de Gaetano, G -- New York, N.Y. -- Science. 1983 Apr 29;220(4596):517-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6682245" target="_blank"〉PubMed〈/a〉
    Keywords: Aspirin/*pharmacology ; Blood Platelets/*drug effects/enzymology ; Dose-Response Relationship, Drug ; Drug Interactions ; Humans ; Imidazoles/pharmacology ; Methacrylates/pharmacology ; Oxidoreductases/*antagonists & inhibitors ; Platelet Aggregation/drug effects ; Thromboxane-A Synthase/*antagonists & inhibitors
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  • 9
    Publication Date: 1983-07-01
    Description: Mammalian atrial extracts possess natriuretic and diuretic activity. In experiments reported here it was found that atrial, but not ventricular, extract also causes relaxation of isolated vascular and nonvascular smooth muscle preparations. The smooth muscle relaxant activity of atrial extract was heat-stable and concentration-dependent and could be destroyed with protease. Rabbit aortic and chick rectum strips were used for the detection of atrial biological activity. The atrial activity was separated by column chromatography into two peaks having apparent molecular weights of 20,000 to 30,000 and less than 10,000. The atrial substance that copurified with the smooth muscle relaxant activity in both peaks caused natriuresis when injected into conscious rats. It appears that atria possess at least two peptides that elicit smooth muscle relaxation and natriuresis, suggesting an endogenous system of fluid volume regulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Currie, M G -- Geller, D M -- Cole, B R -- Boylan, J G -- YuSheng, W -- Holmberg, S W -- Needleman, P -- New York, N.Y. -- Science. 1983 Jul 1;221(4605):71-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6857267" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Atrial Function ; Chickens ; Chromatography, Gel ; Dogs ; Dose-Response Relationship, Drug ; Humans ; Molecular Weight ; Muscle, Smooth/drug effects ; Muscle, Smooth, Vascular/*drug effects ; Natriuresis/drug effects ; Rabbits ; Rats ; Swine ; Vasodilation/drug effects
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  • 10
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 1983-04-15
    Description: Behavior of squirrel monkeys, maintained by the termination of stimuli associated with electric shock, was suppressed by response-dependent shock delivery. The effects of pentobarbital on this behavior depended on whether monkeys had previously received morphine. In monkeys without experience with drugs, pentobarbital increased responding. In monkeys with recent experience with morphine, however, pentobarbital resulted in a smaller increase or decrease in responding. The rate-decreasing effects of pentobarbital after a history of morphine administration could be reversed by the administration of d-amphetamine. These findings suggest that the behavioral effects of abused drugs may depend on previous experience with other drugs, even when those drugs are from a different pharmacological class.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Glowa, J R -- Barrett, J E -- DA 02658/DA/NIDA NIH HHS/ -- DA 02873/DA/NIDA NIH HHS/ -- MH 07658/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1983 Apr 15;220(4594):333-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/6682244" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Behavior, Animal/*drug effects ; Dextroamphetamine/pharmacology ; Dose-Response Relationship, Drug ; Drug Interactions ; Humans ; Macaca mulatta ; Male ; Morphine/pharmacology ; Pentobarbital/*pharmacology ; Saimiri ; Substance-Related Disorders/physiopathology
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