Dihydropyridines
Mostrando 1-12 de 55 artigos, teses e dissertações.
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1. Nano aluminium nitride as a solid source of ammonia for the preparation of hantzsch 1,4-dihydropyridines and bis-(1,4-dihydropyridines) in water via one pot multicomponent reaction
O trabalho mostra a atuação de nanopartículas de nitreto de alumínio em presença da água agindo como a fonte geradora de amônia, empregada na preparação de 1,4-diidropiridinas e bis-(1,4-diidropiridinas). Um procedimento eficiente e simples, "one-pot", é apresentado para síntese de 1,4-diidropiridina e dos derivados de bis-(1,4-diidropiridina), ob
Journal of the Brazilian Chemical Society. Publicado em: 2011-03
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2. On the one pot syntheses of chromeno[4,3-b]pyridine-3-carboxylate and chromeno[3,4-c]pyridine-3-carboxylate and dihydropyridines
Os cromenos, dihidropiridinas e piridinas substituídos têm-se revelado importantes na síntese de compostos com propriedades farmacológicas interessantes. Consequentemente, achamos importante a síntese de cromenopiridinas e cromenodihidropiridinas (ou seja, anéis fundidos do cromeno e da dihidropiridina ou da piridina) de forma a pesquisar a sua ativida
Journal of the Brazilian Chemical Society. Publicado em: 2010
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3. β-enamine esters as precursors of GABA and dihydropyridines analogues / bβ-enamino ésteres como precursores de análogos do GABA e de di-hidropiridinas
This thesis presents a study of iodo-cyclization of β-enamino esters in order to obtain conformationally restricted analogues of γ-amino butiric acid (GABA) and of 1,4-dihydropyridines (DHPs). Trisubstituted cyclopentanes were obtained from iodo-β-enamino esters and the mechanism of their formation was proposed and corroborated by (+)-ESI-MS/M
Publicado em: 2006
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4. Calcium channel activation: a different type of drug action.
Depolarization of NG108-15 (neuroblastoma-glioma) cells causes an increase in 45Ca2+ influx. This effect is blocked by low concentrations of dihydropyridines such as nitrendipine and by other blockers of voltage-sensitive calcium channels such as D-600, diltiazem, and Cd2+. Two other dihydropyridines, BAY K8644 and CGP 28392, have the opposite effect. Low co
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5. Diversity and novel pharmacological properties of Ca2+ channels in Drosophila brain membranes.
Binding studies as well as affinity labelling and immunoblot techniques were used to identify and characterize the receptors for Ca2+ channel blockers in Drosophila brain membranes. Despite structural analogies with mammalian receptors, Drosophila binding sites for phenylalkylamines and 1,4-dihydropyridines, unlike those described in skeletal and cardiac mus
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6. Nerve growth factor modulates the drug sensitivity of neurotransmitter release from PC-12 cells.
The release of catecholamines from adrenal chromaffin cells is known to be blocked by dihydropyridines, such as nitrendipine, and enhanced by others, such as BAY K8644. On the other hand, release from sympathetic neurons is predominantly insensitive to these agents. Release of [3H]norepinephrine from undifferentiated PC-12 pheochromocytoma cells resembles th
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7. Calciseptine, a peptide isolated from black mamba venom, is a specific blocker of the L-type calcium channel.
The venom of the black mamba contains a 60-amino acid peptide called calciseptine. The peptide has been fully sequenced. It is a smooth muscle relaxant and an inhibitor of cardiac contractions. Its physiological action resembles that of drugs, such as the 1,4-dihydropyridines, which are important in the treatment of cardiovascular diseases. Calciseptine, lik
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8. The IVS6 segment of the L-type calcium channel is critical for the action of dihydropyridines and phenylalkylamines.
The current through the L-type calcium channel is inhibited and stimulated by distinct dihydropyridines at very low concentrations. The molecular determinants for the high affinity block and stimulation were investigated using chimeras between the class C and E calcium channels. Mutation of three amino acids in the last putative transmembrane segment (IVS6)
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9. Activation of mouse sperm T-type Ca2+ channels by adhesion to the egg zona pellucida
The sperm acrosome reaction is a Ca2+-dependent exocytotic event that is triggered by adhesion to the mammalian egg’s zona pellucida. Previous studies using ion-selective fluorescent probes suggested a role of voltage-sensitive Ca2+ channels in acrosome reactions. Here, whole-cell patch clamp techniques are used to demonstrate the expression of functi
The National Academy of Sciences of the USA.
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10. The Effect of 1,4-Dihydropyridines on the Initiation and Development of Gametophore Buds in the Moss Funaria1
The plant hormone cytokinin stimulates target caulonemata of Funaria to form buds that develop into the leafy gametophyte. Previous reports have shown that increases in intracellular Ca2+ occur during hormone-activated budding concomitant with an alteration in the polarity of the organelles in the bud site. In order to ascertain the involvement of voltage-de
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11. Phorbol esters enhance synaptic transmission by a presynaptic, calcium-dependent mechanism in rat hippocampus.
1. The effects of phorbol esters on evoked and spontaneous excitatory neurotransmission were studied in the CA1 area in the in vitro hippocampal slice preparation of the rat. Experiments were conducted using field potential recording and whole-cell voltage clamp of CA1 pyramidal neurons. 2. Pyramidal cells dialysed during whole-cell recording with EGTA-conta
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12. In vivo labeling of L-type Ca2+ channels by fluorescent dihydropyridines: evidence for a functional, extracellular heparin-binding site.
We have synthesized and characterized fluorescently labeled dihydropyridines (DHPs) as probes for L-type Ca2+ channels. Racemic as well as (+)- and (-)-1,4-dihydro- 2,6-dimethyl-4-(2-trifluoromethylphenyl)-3,5-pyridinecarboxylic acid 2-(aminoethyl)ethyl ester hydrochlorides were coupled to boron dipyrromethane (Bodipy) derivatives. (4,4-Difluoro-5,7-dimethyl