126
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Castillo C, Hong E. [Vasodilator drugs that act by stimulating guanylate cyclase in vascular smooth muscle]. ARCHIVOS DEL INSTITUTO DE CARDIOLOGIA DE MEXICO 1991; 61:375-84. [PMID: 1683218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Many exogenous and endogenous vasodilator substances produce their effects by stimulation of guanylate cyclase in vascular smooth muscle and increasing cyclic 3',5'-guanosine monophosphate (cGMP) levels. Activation of such enzyme leads to vasodilatation. Possibly as a consequence of a change in the pattern of protein phosphorylation, including dephosphorylation of the light chain myosin and of a decrease in the bioavailability of free calcium. Guanylate cyclase exists in two different forms in the vascular smooth muscle cells: a cytosolic (soluble) and the other associated to membranes (particulate). The nitro vasodilators and vasodilators with endothelium-dependent activity, act by main stimulation of the soluble guanylate cyclase, while the atrial natriuretic factor acts specifically on the particulate form of the enzyme. Guanylate cyclase represents the final path in the vasodilatation induced by diverse endogenous and exogenous substances, an aspect that has created a great interest among investigators due to its possible physiological, physiopathological and therapeutic implications. The more relevant aspects related with the mechanism of action of this numerous group of drugs are deeply analyzed in the present review.
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127
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Bustos HH, Vadillo F, Shor V, Contreras J, Castañeda G, Hong E. [Potentiation of vascular responses induced by placental water-soluble factors of women with pregnancy toxemia]. GINECOLOGIA Y OBSTETRICIA DE MEXICO 1991; 59:146-50. [PMID: 1879726] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This study shows an experimental model in vitro useful to evaluate vasoactivity of EHP. The findings are consistent with other author's reports, as to the potentiation capacity of different vascular responses with biologic fluids in women with EHAE. As far as we know, this is the first report mentioning the placenta as the origin site of this type of substances.
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128
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Cortez R, Rivero IA, Somanathan R, Aguirre G, Ramirez F, Hong E. Synthesis of Quinazolinedione Using Triphosgene. SYNTHETIC COMMUN 1991. [DOI: 10.1080/00397919108020823] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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129
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Flores-Murrieta FJ, Castañeda-Hernández G, Menéndez JC, Chávez F, Herrera JE, Hong E. Pharmacokinetics of sulfamethoxazole and trimethoprim in Mexicans: bioequivalence of two oral formulations (URO-TS D and Bactrim F). Biopharm Drug Dispos 1990; 11:765-72. [PMID: 2271752 DOI: 10.1002/bdd.2510110904] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Two oral pharmaceutical formulations (URO-TS D and Bactrim F) containing 800 mg of sulfamethoxazole (SMZ) and 160 mg of trimethoprim (TMP) were given to 10 Mexican healthy volunteers, following a randomized cross-over design. Blood and urine samples were obtained, concentrations of TMP, SMZ, and its metabolite N4-acetyl SMZ were measured by HPLC and pharmacokinetic analyses were performed. The observed Cmax, tmax, half-life, AUC, and cumulative urinary excretion values for the three compounds studied were within the ranges that have been previously reported for European and North American subjects. Therefore, it appears that pharmacokinetics of SMZ and TMP in Mexicans are similar to those observed in Caucasian populations. When the two studied formulations were compared, no statistically significant differences were detected in any pharmacokinetic parameter. Therefore, it is concluded that both brands tested are bioequivalent. Moreover, these two formulations manufactured in Mexico yield SMZ and TMP plasma and urine levels similar to those obtained with equivalent formulations of European or North American origin.
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130
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Villalobos-Molina R, Ransanz V, Torres-Márquez ME, Hong E, García-Sáinz JA. Contrasting effects of phorbol dibutyrate and phorbol myristate acetate in rabbit aorta. Biochem Biophys Res Commun 1990; 171:618-24. [PMID: 2403351 DOI: 10.1016/0006-291x(90)91191-t] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In rat hepatocytes, active phorbol esters inhibited the alpha 1-adrenergic stimulation of phosphatidylinositol labeling with the expected potency order: phorbol myristate acetate (PMA) greater than phorbol dibutyrate (PDB). In contrast, in rabbit aorta the alpha 1-adrenergic action was inhibited dose-dependently by PDB but not by PMA. Similarly PDB (but not PMA) induced a strong contraction in rabbit aorta. The phorbol ester-induced contraction developed slowly, was dose-dependent and independent of extracellular calcium. These effects of PDB in rabbit aorta were neither inhibited by the protein kinase inhibitor H-7 nor mimicked by the synthetic diacylglycerol, OAG. Our results raise some doubts on the mechanism(s) through which the actions of PDB take place in rabbit aorta.
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131
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Hong E, Angulo A. Influence of adrenalectomy on vasopressor responses to α1 agonists. Eur J Pharmacol 1990. [DOI: 10.1016/0014-2999(90)94646-f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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132
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Flores Murrieta FJ, Castañeda Hernández G, Hong E. [Pharmacokinetics and antihypertensive effect of pelanserin in dogs ]. ARCHIVOS DEL INSTITUTO DE CARDIOLOGIA DE MEXICO 1990; 60:347-51. [PMID: 2268171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Pelanserin pharmacokinetics were studied in six normotensive dogs after intravenous and oral administration. Additionally, the relationship between pelanserin plasma levels and its antihypertensive effect was studied in six hypertensive dogs after a single oral administration. Plasma level-time curves were fitted to an open two compartments model. Pelanserin bioavailability after oral dosing was about 30%, this could be due to a poor absorption from the gastrointestinal tract or to an important hepatic biotransformation by first pass effect. On the other hand, oral administration of pelanserin resulted in a significant antihypertensive effect that was not followed by tachycardia. Pelanserin plasma levels did not significantly correlate with the obtained antihypertensive effect. These results suggest that the observed effect was not only due to an action at peripheral level, but other mechanisms could likely be involved, probably with participation of the central nervous system. The pharmacokinetic and pharmacodynamic profiles of pelanserin allow to predict that this drug could have a place in the therapeutics of arterial hypertension.
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133
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Flores-Murrieta FJ, Castañeda-Hernández G, Hong E. Determination of pelanserin in human plasma by high-performance liquid chromatography with amperometric detection. JOURNAL OF CHROMATOGRAPHY 1990; 528:501-8. [PMID: 2384588 DOI: 10.1016/s0378-4347(00)82410-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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134
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De León H, Castañeda-Hernández G, Hong E. Different time course of atrial natriuretic factor-induced relaxation in rabbit aorta and portal vein. Eur J Pharmacol 1990; 182:171-4. [PMID: 2144821 DOI: 10.1016/0014-2999(90)90508-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Atrial natriuretic factor (ANF) and nitroglycerine were tested in superfused rabbit aorta and portal vein strips precontracted with norepinephrine. The ANF dose-response curves were similar in both tissues, however, relaxation was fast and transient in portal veins whereas it was sustained and of slow onset in aortas. Nitroglycerine was more potent in portal veins than in aortas but relaxation was fast and transient in both tissues. The results suggest that the time course of ANF-induced relaxation in different vessels may be of relevance to the overall hemodynamic profile of this peptide in intact animals.
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135
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Hoyo-Vadillo C, Castañeda-Hernández G, Herrera JE, Vidal-Gárate J, Moreno-Ramos A, Chávez F, Hong E. Pharmacokinetics of nifedipine slow release tablet in Mexican subjects: further evidence for an oxidation polymorphism. J Clin Pharmacol 1989; 29:816-20. [PMID: 2808746 DOI: 10.1002/j.1552-4604.1989.tb03425.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Nifedipine kinetics after ingestion of 20 mg slow release tablets were studied in 12 young, healthy, Mexican subjects. Plasma levels were determined by a nifedipine-specific HPLC assay. Levels rose after drug administration reaching a maximum concentration of 48.7 +/- 7.3 ng/ml in 2.1 +/- 0.7 h (mean +/- SEM). Concentrations then decayed with a terminal half-life of 16.9 +/- 3.1 hours. AUC was 526 +/- 62 ng h/ml. Five individuals were fast and seven were slow nifedipine metabolizers, according to the AUC criterion proposed by Kleinbloesem and coworkers. Individual AUC/Dose values from this and from other two studies on oral nifedipine kinetics in Mexicans were cumulated and the frequency histogram and probit analyses were performed (N = 30). A bimodal distribution was clearly observed. Fast and slow metabolizers were distinguished as those subjects with AUC/Dose values either lower or higher than 22.5 ng h/ml mg. Unlike European populations, it appears that slow metabolization is more frequent in Mexicans. Data strongly support the hypothesis of the existence of a polymorphism concerning nifedipine disposition kinetics due to genetic basis.
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136
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Flores-Murrieta FJ, Hoyo-Vadillo C, Hong E, Castañeda-Hernandez G. Assay of ambroxol in human plasma by high-performance liquid chromatography with amperometric detection. JOURNAL OF CHROMATOGRAPHY 1989; 490:464-9. [PMID: 2768418 DOI: 10.1016/s0378-4347(00)82807-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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137
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Hoyo-Vadillo C, Castañeda-Hernández G, Herrera JE, Vidal-Gárate J, Salazar LA, Moreno-Ramos A, Chávez F, Tena I, Hong E. Pharmacokinetics of oral nifedipine: relevance of the distribution phase. J Clin Pharmacol 1989; 29:251-6. [PMID: 2723112 DOI: 10.1002/j.1552-4604.1989.tb03322.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Pharmacokinetics of oral Nifedipine was studied in 12 Mexican young healthy volunteers, six men and six women, who received a 10 mg capsule. Plasma levels were determined by a nifedipine specific HPLC assay. Experimental data were fitted and pharmacokinetic parameters were calculated using an open two compartment model. No statistically significant difference was detected between men and women, thus both sexes were considered as a single population. Nifedipine plasma levels rose rapidly (ka = 8.46 +/- 1.96 h-1) reaching a maximum concentration of 145 +/- 23 ng/ml in 0.61 +/- 0.07 h. Plasma levels then decayed with a distribution phase (alpha = 1.98 +/- 0.40 h-1, t1/2 alpha = 0.46 +/- 0.06 h) and a terminal elimination phase (beta = 0.17 +/- 0.03 h-1, t1/2 beta = 4.98 +/- 0.55 h). AUC was 384 +/- 41 ng h/ml. Values of AUC and t1/2 beta were higher than those reported by other authors. Differences in the AUC could be due to ethnic origin, environmental factors or nutritional habits. Ten subjects presented plasma concentration-time curves in which the distribution phase was clearly distinguishable, having a ka/alpha relationship higher than 1.5. For the other two subjects, the distribution phase was not apparent and ka/alpha was lower than 1.5. The results show that an adequate characterization of the distribution phase is required if one pretends to use pharmacokinetic data for dosage regimen design.
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138
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Vidal-Gárate J, Castañeda Hernández G, Hoyo Vadillo C, Herrera Abarca JE, Salazar LA, Moreno Ramos A, Fortino Chávez J, Tena I, Hong E. [Clinical and pharmacokinetic comparison of 2 oral preparations of nifedipine: 10 mg capsules and 20 mg delayed-release tablets]. ARCHIVOS DEL INSTITUTO DE CARDIOLOGIA DE MEXICO 1989; 59:73-80. [PMID: 2486739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The effects and pharmacokinetic parameters of two oral formulations of nifedipine, 10 mg capsule (Adaltat) and 20 mg slow release tablet (Adalat a.p.). With the 10 mg capsule nifedipine was rapidly absorbed, reaching a maximum concentration of 120 +/- 39 ng/ml in 0.52 +/- 0.07 h, and also rapidly eliminated with an apparent halflife of 5.51 +/- 0.64 h. A fall in blood pressure and a raise in heart rate, that significantly correlated with plasma levels, were observed. 83% of the subjects reported headache, that was probably due to the sudden increase in plasma levels. With the 20 mg slow release tablet nifedipine absorption was slower, reaching a maximum concentration of 39 +/- 7 ng/ml in 1.82 +/- 0.43 h, and the apparent half-life (16.89 +/- 3.14 h) was longer than with the capsule. A fall in blood pressure was observed that significantly correlated with plasma levels; however, there was no significant correlation between these and changes in heart rate. Only 17% of the subjects reported headache. Pharmacokinetic data indicate that, in most subjects, nifedipine therapeutics plasma levels (over 15 ng/ml) can be maintained with the administration of a 20 mg slow release tablet every 12 hours. This, joined to the reduction in side effects, suggest that this formulation is the adequate alternative in chronic treatments with nifedipine, such as arterial hypertension.
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139
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Flores-Murrieta FJ, Hong E, Castañeda-Hernández G. Sensitive high-performance liquid chromatographic assay of pelanserin, a novel antihypertensive agent, in plasma samples. JOURNAL OF CHROMATOGRAPHY 1988; 428:167-72. [PMID: 3170670 DOI: 10.1016/s0378-4347(00)83903-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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140
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de León H, Castañeda-Hernández G, Hong E. Decreased ANF atrial content and vascular reactivity to ANF in spontaneous and renal hypertensive rats. Life Sci 1987; 41:341-8. [PMID: 2955185 DOI: 10.1016/0024-3205(87)90158-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The relationship between ANF activity and hypertension was determined by measuring ANF atrial content and vascular reactivity in two different models: spontaneous hypertensive rats (SHR) and renal hypertensive rats (RHR). Atrial extracts and aortic strips were prepared from hypertensive and normotensive animals. Relaxant activities of extracts, synthetic ANF and nitroglycerin were assayed on superfused aortic strips previously contracted by norepinephrine. ANF atrial content was statistically significantly lower in both models of hypertension, presumably by increased ANF release into the circulation which results in depletion of tissue storage sites. Vascular subsensitivity to ANF and nitroglycerin was found in both models of hypertension. Diminished ANF vascular reactivity in hypertension could be due to receptor down-regulation and/or to a decrease in the ability of cGMP to induce relaxation.
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141
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Mourelle M, Amezcua JL, Hong E. Effect of rioprostil and colchicine on CCl4-acute liver damage in rats. Relationship with plasma membrane lipids. PROSTAGLANDINS 1987; 33:869-77. [PMID: 2890182 DOI: 10.1016/0090-6980(87)90115-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The effects of colchicine (10 g/day p.o. for 7 days) and rioprostil (2-decarboxy, 2-hydroxymethyl-15-deoxy-16-RS-hydroxy-16-methyl-prostaglandin-E1) (20 g/kg s.c., a single dose) on the enzymatic and histological markers of acute liver damage were studied in rats intoxicated with a single oral dose of CCl4. The rats were sacrificed 24 h after CCl4. The lipid composition of the liver plasma membranes was also determined. The increase in Alk. Phosp., GGTP and GPT activities and bilirubin concentration in serum as well as the histological images produced by CCl4 were equally prevented by the treatments with colchicine or rioprostil. CCl4 changed the lipid composition of the liver plasma membrane by increasing PI and PC and decreasing SM, PS and PEA. There was a decrease in the cholesterol/phospholipid ratio at the expense of a reduction of cholesterol/protein ratio and elevation in phospholipid/protein ratio. Colchicine and rioprostil also prevented these lipid alterations. The results suggest that the plasma membrane is an important site of action of CCl4 and of the 2 drugs studied. We postulate that the plasma membrane rather than other organelles is the target for the cytoprotective actions of prostaglandins.
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142
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Montaño LM, Selman M, Hong E. Different effects of epinephrine on the Erythrocebus patas tracheal smooth muscle: predominance of alpha-adrenergic receptors. ARCHIVOS DE INVESTIGACION MEDICA 1985; 16:169-74. [PMID: 2866756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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143
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144
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Villalobos-Molina R, Uc M, Hong E, García-Sáinz JA. Correlation between phosphatidylinositol labeling and contraction in rabbit aorta: effect of alpha-1 adrenergic activation. J Pharmacol Exp Ther 1982; 222:258-61. [PMID: 6123590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Activation of rabbit aortic strips with alpha adrenergic agonists increased the labeling (with [32P]Pi) of phosphatidylinositol (PI) and phosphatidic acid and contracted the vascular preparations in dose-related fashion. Epinephrine, norepinephrine and methoxamine produced maximal effects, whereas clonidine behaved as partial agonist and B-HT 933 (2-amino-6-ethyl-4,5,7,8-tetrahydro-6H-oxazole-[5,4-d] azepin dihydrochloride) was almost without activity in the two experimental models used. Phenylephrine was a full agonist in producing contraction, but failed to elicit the maximal increase in PI labeling. The EC50 values to produce contraction of aortic strips were lower for all agonists than those required to increase the incorporation of radioactive phosphate into PI, but there was a good correlation between the two sets of data. The increased PI labeling and contraction of aortic strips induced by epinephrine were antagonized by prazosin and yohimbine in dose-related fashion, but the first alpha blocker was about three orders of magnitude more potent than the second in antagonizing the two effects. The present results indicate that both stimulation of PI labeling and contraction are mediated through activation of alpha-1 adrenoceptors in rabbit aorta.
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145
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Safdy ME, Kurchacova E, Schut RN, Vidrio H, Hong E. Tryptophan analogues. 1. Synthesis and antihypertensive activity of positional isomers. J Med Chem 1982; 25:723-30. [PMID: 7097726 DOI: 10.1021/jm00348a022] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A series of tryptophan analogues having the carboxyl function at the beta-position was synthesized and tested for antihypertensive activity. The 5-methoxy analogue 46 exhibited antihypertensive activity in the rat via the oral route and was much more potent than the normal tryptophan analogue. The methyl ester was found to be a critical structural feature for activity.
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146
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Hong E. [Excellence of quipazine in the characterization of serotoninergic receptors and mechanisms]. GAC MED MEX 1982; 118:158-64. [PMID: 7117731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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147
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Scriabine A, Taylor DG, Hong E. Central control of arterial pressure by drugs. PROGRESS IN DRUG RESEARCH. FORTSCHRITTE DER ARZNEIMITTELFORSCHUNG. PROGRES DES RECHERCHES PHARMACEUTIQUES 1982; 26:353-71. [PMID: 6128765 DOI: 10.1007/978-3-0348-7111-2_10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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148
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Abstract
The stimulation of central serotonin receptors leading to a decrease in blood pressure is well documented, but the nature of these receptors is not well known. It was therefore decided to characterize such receptors by assessing the modifications in blood pressure and heart rate after the intracerebroventricular administration of several drugs to anesthetized cats. Serotonin produced a dose-related decrease in blood pressure and heart rate, while parachloroamphetamine produced a slowly developing increase in blood pressure, and quipazine did not affect any of the parameters measured. The hypotension produced by serotonin was not modified by pretreatment with methysergide, was partially antagonized by quipazine, and was completely blocked by tolazoline. The present findings suggest that the central serotonin receptors which modulate blood pressure are different not only from peripheral receptors, but also from other receptors of this type.
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149
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Whaite P, Aborhey S, Hong E, Rogers PL. Microprocessor control of respiratory quotient. Biotechnol Bioeng 1978. [DOI: 10.1002/bit.260200911] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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150
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Arndt HC, Gardiner PJ, Hong E, Kluender HC, Myers C, Woessner WD. The synthesis and biological activity of omega-pentanor-15-alkylcyclobutyl-PGE1 analogs. PROSTAGLANDINS 1978; 16:67-77. [PMID: 704925 DOI: 10.1016/0090-6980(78)90202-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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