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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Estudo do perfil cinético e alométrico do protótipo de fármaco antineoplásico LQFM018 em modelos experimentais por LC-MS/MS / Study of the kinetic and allometric profile of antineoplastic prototype drug LQFM018 in experimental models by LC-MS/MS

Rodrigues, Andryne Rego 31 March 2015 (has links)
Submitted by Cláudia Bueno (claudiamoura18@gmail.com) on 2015-11-13T18:32:07Z No. of bitstreams: 2 Dissertação - Andryne Rego Rodrigues - 2015.pdf: 2461639 bytes, checksum: bb68746f2a88958ad5b055b56cd3326a (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2015-11-16T09:29:26Z (GMT) No. of bitstreams: 2 Dissertação - Andryne Rego Rodrigues - 2015.pdf: 2461639 bytes, checksum: bb68746f2a88958ad5b055b56cd3326a (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) / Made available in DSpace on 2015-11-16T09:29:26Z (GMT). No. of bitstreams: 2 Dissertação - Andryne Rego Rodrigues - 2015.pdf: 2461639 bytes, checksum: bb68746f2a88958ad5b055b56cd3326a (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5) Previous issue date: 2015-03-31 / LQFM018 is a prototype drug with proven anticancer activity in vitro (cytotoxicity against K-562 cell line, IC50 = 0.07652 mM), which was obtained by molecular simplification from antitumor compounds called nutlins, inhibitors of the interaction MDM2-p53. This study aimed to determine its pharmacokinetic profile, using, to this end, validated bioanalytical method in LC-MS/MS. The parameters used in analytical LC-MS/MS were: ACE® C18 column (100 mm × 4.6 mm, 5 μm), mobile phase buffer 2 mM ammonium acetate with 0.025% formic acid and methanol (50%:50% v/v), flow 1.2 mL/min, temperature of the column 40 °C, internal standard (IS) domperidone, liquid-liquid extraction with methyl tert-butyl ether (MTBE) and injection volume of 3.0 μL. The method was linear from 10 to 15,000 ng/mL (r = 0.9997). Intrarun precision was ranged from 0.6% to 5.5% and interrun from 1.8% to 6.7%. The accuracy found was 99.0% to 107.0% and the average recovery of controls was 74.1% ± 4.9%. The retention times were 3.16 min for LQFM018 and 1.81 min to domperidone. LQFM018 was administered to 3 females Wistar rats at 100 mg/kg, i.p. After administration, 0.5 mL samples of blood were collected by cannulation of the left jugular vein with heparinized syringe, at 1h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h and 9 h. Blood samples were identified and centrifuged to obtain plasma which was frozen at -20 °C until the time of analysis. The pharmacokinetic parameters (mean ± SD) were t½ = 2.89 ± 2.0 h; ClT/F = 22.01 ± 13.5 mL/min/kg; Vd/F = 5.48 ± 3.6 L/kg. The values of Vd/F, t½ and CLT/F extrapolated using allometric scaling for a person weighing 70 kg were 1954.3 L/kg, 12.6 h and 1800.4 mL/min/kg, respectively. The bioanalytical method was suitable for the detection and quantification of LQFM018 from plasma rat. The kinetic profile, extrapolated on allometric scaling, revealed a high value of t½, high Vd and long value of CLT, allowing understand that the studied prototype showed good tissue distribution profile and was extensively eliminated. / O composto LQFM018 é um protótipo de fármaco com comprovada atividade antineoplásica in vitro (citotoxicidade contra a linhagem celular K-562 com IC50 = 0,07652 mM) que foi obtida através de simplificação molecular a partir de compostos antitumorais denominados nutlins, inibidores da interação MDM2-p53. O presente trabalho objetivou a realização do estudo de seu perfil farmacocinético, empregando-se, para tal, método bioanalítico validado em LC-MS/MS. Os parâmetros analíticos utilizados em LC-MS/MS foram: coluna ACE® C18 (100 mm × 4,6 mm, 5 μm), fase móvel tampão 2 mM acetato de amônio com ácido fórmico 0,025% e metanol (50%:50%, v/v), fluxo de 1,2 mL/min, temperatura da coluna de 40°C, padrão interno (PI) domperidona, extração líquido-líquido com éter metil-terc-butil (MTBE) e volume de injeção de 3,0 μL. O método apresentou linearidade de 10 a 15.000 ng/mL (r = 0,9997). A precisão intracorrida variou de 0,6% a 5,5% e a intercorrida de 1,8% a 6,7%. A exatidão encontrada foi de 99,0% a 107,0% e a recuperação média dos controles foi de 74,1% ± 4,9%. Os tempos de retenção foram de 3,16 min para o LQFM018 e 1,81 min para a domperidona (PI). O LQFM018 foi administrado em três ratas Wistar na dose de 100 mg/kg, i.p. Após a administração, foram coletadas amostras de 0,5 mL de sangue, por canulação da veia jugular esquerda, com seringa heparinizada, nos tempos de 1 h, 2 h, 3 h, 4 h, 5 h, 6 h, 7 h, 8 h e 9 h. As amostras sanguíneas foram identificadas e centrifugadas para obtenção do plasma, que foi congelado a -20 ºC até o momento da análise. Os parâmetros farmacocinéticos (média ± DPR) foram: t1/2 = 2,89 ± 2,0 h; ClT/F = 22,01 ± 13,5 mL/min/kg; Vd/F = 5,48 ± 3,6 L/kg. Os valores de Vd/F, t½ e ClT/F extrapolados, através de escala alométrica, para um indivíduo de 70 kg foram de 1.954,3 L/kg, 12,6 h e 1800,4 mL/min/kg, respectivamente. O método bioanalítico foi adequado para a detecção e quantificação do LQFM018 em plasma de rato. O perfil farmacocinético, extrapolado em escala alométrica, apresentou alto valor de t1/2, elevado Vd e extenso valor de CLT, permitindo entender que o protótipo estudado demonstrou um bom perfil de distribuição tecidual e foi extensivamente eliminado.

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