RESUMEN
<p><b>OBJECTIVE</b>To explore the effects of 2A-1-1 (purified component from Panax notoginsengs saponins) on the aggregation of and Ca2+ influx into human platelets.</p><p><b>METHODS</b>The aggregation of platelets was tested by nephelometry, Fura-2 fluorescent technique was used for detecting cell [Ca2+]i. The effects of 2A-1-1, nifedipine and SK&F96365 on Ca(2+) influx into human platelets induced by ADP or CPA were observed separately.</p><p><b>RESULTS</b>Nifedipine (< 20 micromol/L) could not inhibit platelet aggregation induced by ADP or the Ca(2+) influx induced by ADP or CPA. SK&F96365 at 20 micromol/L could inhibit the maximal aggregation of platelets induced by ADP with a inhibitory rate of 59.83%, at 15 micromol/L could inhibit the Ca2+ influx induced by CPA or ADP. 2A-1-1 (5, 10 and 20 micromol/L) could inhibit the maximal aggregation of platelets induced by ADP with the inhibitory rates of 47.06%, 53.47% and 71.52%, respectively. 2A-1-1 at 10 and 20 micromol/L could inhibit the Ca2+ influx induced by CPA or ADP.</p><p><b>CONCLUSIONS</b>2A-1-1 can inhibit platelets aggregation, block the ROC (Receptor-dependent Ca2+ channels) and inhibit Ca2+ influx of human platelets.</p>
Asunto(s)
Adulto , Femenino , Humanos , Masculino , Adenosina Difosfato , Farmacología , Plaquetas , Biología Celular , Metabolismo , Calcio , Metabolismo , Farmacocinética , Bloqueadores de los Canales de Calcio , Farmacología , Relación Dosis-Respuesta a Droga , Ginsenósidos , Farmacología , Imidazoles , Farmacología , Indoles , Farmacología , Nifedipino , Farmacología , Agregación Plaquetaria , Inhibidores de Agregación Plaquetaria , FarmacologíaRESUMEN
<p><b>OBJECTIVE</b>To investigate the mutant alleles of thiopurine S-methyltransferase (TPMT) among Jing Chinese.</p><p><b>METHODS</b>Polymerse chain reaction-single strand conformation polymorphism (PCR-SSCP) techniques were developed for assaying exons 5, 7 and 10 of the TPMT gene respectively and were used to detect mutant TPMT alleles among Jing Chinese.</p><p><b>RESULTS</b>Two cases of TPMT*3C (A719G) heterozygotes were identified in 103 Jing Chinese; other deleterious alleles such as TPMT*2 (G238C), TPMT*3A (G460A/A719G) and TPMT*3B (G460A) were not found; 27 cases of silent mutant allele TPMT*1S (T474C) were also identified (5 homozygotes and 22 heterozygotes).</p><p><b>CONCLUSION</b>The PCR-SSCP assay established and adopted in this study was sensitive and reliable, which could be used to detect mutant TPMT alleles. Allele frequency of TPMT*3C is low among Jing Chinese (1.0%), and TPMT*3C appears to be the most prevalent deleterious allele in this population.</p>