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Synthesis and evaluation of imidazole-4,5- and pyrazine-2,3-dicarboxamides targeting dengue and yellow fever virus.

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The results of a high-throughput screening assay using the dengue virus-2 replicon showed that the imidazole 4,5-dicarboxamide (I45DC) derivative (15a) has a high dengue virus inhibitory activity. Based on 15a as a lead compound, a novel class of both disubstituted I45DCs and the resembling pyrazine

Synthetic strategy and antiviral evaluation of diamide containing heterocycles targeting dengue and yellow fever virus.

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High-throughput screening of a subset of the CD3 chemical library (Centre for Drug Design and Discovery; KU Leuven) provided us with a lead compound 1, displaying low micromolar potency against dengue virus and yellow fever virus. Within a project aimed at discovering new inhibitors of flaviviruses,

Enhancement of hyperthermia effect in vivo by amiloride and DIDS.

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OBJECTIVE Intracellular pH is regulated mainly by Na+/H+ antiport and Cl-/HCO3- exchange through the cell membrane. Amiloride (3,5-diamino-6-chloro-N-(diaminomethylene)pyrazine carboxamide) is a diuretic drug that blocks Na+/H+ antiport and DIDS (4,4-diisothiocyanatostilbene-2,2'-disulfonic acid) is

Efficacy of favipiravir (T-705) and T-1106 pyrazine derivatives in phlebovirus disease models.

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Several studies have reported favipiravir (T-705) to be effective in treating a number of viral diseases modeled in rodent systems. Notably, the related pyrazine derivative, T-1106, was found to be more effective than T-705 in treating yellow fever virus infection in hamsters. Based on these

Selective desensitization of serotonin (5-HT) receptor-mediated hyperthermia by mianserin and other 5-HT antagonists.

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Hyperthermic responses to 6-chloro-2-(1-piperazinyl)-pyrazine (MK-212) and hypothermic responses to 8-hydroxy-2-(di-n-propylamino)tetralin (8-OH-DPAT) were assessed in rats as an in vivo index of the responsiveness of 5-HT2 and 5-HT1A receptors, respectively. Forty-eight hours after a single

Activity of T-1106 in a hamster model of yellow Fever virus infection.

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Yellow fever virus (YFV) causes 30,000 deaths worldwide, despite the availability of a vaccine. There are no approved antiviral therapies for the treatment of YFV disease in humans, and, therefore, these studies were designed to investigate the anti-YFV properties of T-1106, a substituted pyrazine,

Efficacy of T-705 (Favipiravir) in the Treatment of Infections with Lethal Severe Fever with Thrombocytopenia Syndrome Virus.

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Severe fever with thrombocytopenia syndrome virus (SFTSV) is the causative agent of SFTS, an emerging hemorrhagic fever. This disease has a high case fatality rate and is endemic to China, South Korea, and Japan. Because there are currently no effective therapeutics for SFTS, potent and safe

Treatment of late stage disease in a model of arenaviral hemorrhagic fever: T-705 efficacy and reduced toxicity suggests an alternative to ribavirin.

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A growing number of arenaviruses are known to cause viral hemorrhagic fever (HF), a severe and life-threatening syndrome characterized by fever, malaise, and increased vascular permeability. Ribavirin, the only licensed antiviral indicated for the treatment of certain arenaviral HFs, has had mixed

Interdisciplinary investigation on ancient Ephedra twigs from Gumugou Cemetery (3800 B.P.) in Xinjiang region, northwest China.

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In the dry northern temperate regions of the northern hemisphere, the genus Ephedra comprises a series of native shrub species with a cumulative application history reaching back well over 2,000 years for the treatment of asthma, cold, fever, as well as many respiratory system diseases, especially

Toxicological Evaluation of Phytochemical Characterized Aqueous Extract of Wild Dried Lentinus squarrosulus (Mont.) Mushroom in Rats.

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Lentinus squarrosulus (Mont.) is an edible wild mushroom with tough fruiting body that belongs to the family Polyporaceae. It is used in ethnomedicine for the treatment of ulcer, anaemia, cough and fever. Recent studies have demonstrated its anticancer, anti-diabetic and antioxidant

Yet another ten stories on antiviral drug discovery (part D): paradigms, paradoxes, and paraductions.

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This review article presents the fourth part (part D) in the series of stories on antiviral drug discovery. The stories told in part D focus on: (i) the cyclotriazadisulfonamide compounds; (ii) the {5-[(4-bromophenylmethyl]-2-phenyl-5H-imidazo[4,5-c]pyridine} compounds; (iii)

Thermoregulatory responses to serotonin (5-HT) receptor stimulation in the rat. Evidence for opposing roles of 5-HT2 and 5-HT1A receptors.

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The effects of serotonergic agonists and antagonists on the body temperatures of rats were investigated. The administration of the serotonin (5-HT) agonist 6-chloro-2(1-piperazinyl)-pyrazine (MK-212) produced a dose-related increase in body temperature. A maximal increase in body temperature of

T-705 (favipiravir) inhibition of arenavirus replication in cell culture.

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A number of New World arenaviruses (Junín [JUNV], Machupo [MACV], and Guanarito [GTOV] viruses) can cause human disease ranging from mild febrile illness to a severe and often fatal hemorrhagic fever syndrome. These highly pathogenic viruses and the Old World Lassa fever virus pose a significant

In vitro and in vivo activities of T-705 against arenavirus and bunyavirus infections.

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There is a need for the development of effective antivirals for the treatment of severe viral diseases caused by members of the virus families Bunyaviridae and Arenaviridae. The pyrazine derivative T-705 (6-fluoro-3-hydroxy-2-pyrazinecarboxamide) has demonstrated remarkable antiviral activity

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