ABSTRACT
ABSTRACT 6-Methylcoumarin (6MC) is a semisynthetic coumarin with important in vitro and in vivo anti-inflammatory activity. In order to continue the pre-clinical characterization of this molecule, in vitro intestinal permeability, plasma profile and tissue distribution after oral administration in rats were studied. The permeability of 6MC was evaluated by the Caco-2 cellular model in both the apical-basal (A-B) and basal-apical (B-A) directions. The pharmacokinetics and biodistribution were evaluated in rats after oral and intraperitoneal administration at doses of 200 mg/kg. Transport experiments with Caco-2 cells showed that 6MC presented high permeability at all concentrations evaluated. This finding suggested that 6MC could be transported across the gut wall by passive diffusion. The plasma concentration-time curve showed that the maximum concentration (Cmax) was 17.13 ± 2.90 µg/mL at maximum time (Tmax) of 30 min for the oral route and Cmax 26.18 ± 2.47 µg/mL at 6.0 min for the intraperitoneal administration, with elimination constant of (Ke ) 0.0070 min-1 and a short life half time of (T1/2 ) lower that 120 min. The distribution study showed that 6MC has high accumulation in the liver, and widespread distribution in all the organs evaluated.
Subject(s)
Animals , Male , Female , Rats , Permeability , In Vitro Techniques/instrumentation , Administration, Oral , Rats, Wistar/classification , Coumarins/analysis , Pharmacokinetics , Peritoneal Absorption , Intestinal Diseases/classificationABSTRACT
Se evaluó el efecto de extractos metanólicos y acuosos de las especies vegetales Critoniella acuminata, Salvia rubescens, Phenax rugosus (Poir.) Wedd y Tabebuia chrysanta G. Nicholson sobre las enzimas elastasa y mieloperoxidasa, relacionadas con el proceso de desgranulación leucocitaria, y se determinó el potencial efecto inhibitorio directo sobre la enzima o la inhibición de la desgranulación de los neutrófilos polimorfonucleares. Los extractos de Critoniella acuminata y Salvia rubescens presentaron efectos sobre el proceso de desgranulación y la actividad de las enzimas mieloperoxidasa y elastasa; en el caso de los extractos de Phenax rugosus, estos no mostraron un efecto significativo sobre ninguna de las enzimas. De la especie Tabebuia chrysanta solamente el extracto metanólico mostró efecto sobre la inhibición de la actividad elastasa.
In this work, the effect of aqueous and methanolic extracts of the plants species Critoniella acuminata, Salvia rubescens, Phenax rugosus (Poir.) Wedd and Tabebuia chrysanta G. on the enzymes elastase and myeloperoxidase, involved in degranulation leukocyte process, was evaluated, identifying the potential direct inhibitory effect on the enzyme and/or inhibition of the desgranulation of polymorphonuclear neutrophils. Extracts of Critoniella acuminata and Salvia rubescens presented effects on the degranulation process and the inhibition of the enzyme elastase and myeloperoxidase; the extracts of Phenax rugosus do not showed significant effect. Tabebuia chrysanta methanolic extract only showed effect on inhibition of elastase activity.