ES2500921T3 - Composiciones para potenciar el transporte y la eficacia antisentido de análogos de ácidos nucleicos en células - Google Patents
Composiciones para potenciar el transporte y la eficacia antisentido de análogos de ácidos nucleicos en células Download PDFInfo
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- ES2500921T3 ES2500921T3 ES10174646.9T ES10174646T ES2500921T3 ES 2500921 T3 ES2500921 T3 ES 2500921T3 ES 10174646 T ES10174646 T ES 10174646T ES 2500921 T3 ES2500921 T3 ES 2500921T3
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Abstract
Un conjugado de péptido-análogo de ácido nucleico, que comprende un péptido covalentemente unido a un análogo de ácido nucleico, análogo de ácido nucleico que comprende una cadena principal sustancialmente no cargada y una secuencia de bases de direccionamiento, y péptido que consiste en de ocho a dieciséis subunidades y que comprende al menos seis subunidades X, al menos dos subunidades Y y hasta tres subunidades Z opcionales, donde > 50% de las subunidades son subunidades X, en donde (a) cada subunidad X es independientemente arginina o un análogo de arginina, siendo el análogo de arginina un α-aminoácido catiónico que comprende una cadena lateral de estructura R1N>=C(NH2)R2, donde R1 es H o R; R2 es R, NH2, NHR o NR2, donde R es alquilo inferior o alquenilo inferior y comprende opcionalmente oxígeno o nitrógeno, o R1 y R2 pueden formar conjuntamente un anillo; y en donde la cadena lateral está unida al aminoácido a través de R1 o R2; (b) las al menos dos subunidades Y comprenden dos subunidades de α-aminoácido hidrófobo neutro que comprenden una cadena lateral de alquilo, alquenilo, alquinilo, arilo o aralquilo sustituida o no sustituida, en donde la cadena lateral de alquilo, alquenilo o alquinilo incluye a lo sumo un heteroátomo por cada seis átomos de carbono, y en donde las subunidades Y son contiguas o están flanqueando un componente conector; y (c) cada subunidad Z representa independientemente una subunidad de aminoácido seleccionada de entre alanina, asparagina, cisteína, glutamina, glicina, histidina, lisina, metionina, serina y treonina; en donde el péptido está opcionalmente unido al análogo de ácido nucleico a través de un conector seleccionado de entre: (i) una subunidad de cisteína; (ii) un componente conector no aminoácido sin carga; (iii) un α-aminoácido hidrófobo neutro que comprende una cadena lateral de alquilo, alquenilo, alquinilo, arilo o aralquilo sustituida o no sustituida, en donde la cadena lateral de alquilo, alquenilo o alquinilo incluye a lo sumo un heteroátomo por cada dos átomos de carbono; y (iv) un aminoácido hidrófobo neutro que tiene la estructura siguiente: -C(O)-(CH2)n-1(CHR)-NHen donde n es de 2 a 7 y R es H o metilo.
Description
E10174646
08-09-2014
- R9F2
- RRRRRRRRRFF 13
- 2d-R9F2
- DRDRRRRRRRRFF (isómero mixto) 14
- D-R9F2
- DRDRDRDRDRDRDRDRDRDFDFD (isómero D) 15
- R9CF2
- RRRRRRRRRCFF 16
- R8CF2R
- RRRRRRRRCFFR 17
- R6CF2R3
- RRRRRRCFFRRR 18
- R5FCFR4
- RRRRRFCFRRRR 19
- R5F2R4
- RRRRRFFRRRR 20
- R4CF2R5
- RRRRCFFRRRRR 21
- R2CF2R7
- RRCFFRRRRRRR 22
- CF2R9
- CFFRRRRRRRRR 23
- CR9F2
- CRRRRRRRRRFF 24
- F2R9
- FFRRRRRRRRR 25
- R5F2CF2R4
- RRRRRFFCFFRRRR 26
- R9I2
- RRRRRRRRRII 27
- R8F3
- RRRRRRRRFFF 28
- R9F4
- RRRRRRRRRFFFF 29
- R8F2
- RRRRRRRRFF 30
- R6F2
- RRRRRRFF 31
- R5F2
- RRRRRFF 32
- (RRAhx)4
- RRAhxRRAhxRRAhxRRAhx 33
- (RAhxR)4
- RAhxRRAhxRRAhxRRAhxR 34
- (AhxRR)4
- AhxRRAhxRRAhxRRAhxRR 35
- (RAhx)6
- RAhxRAhxRAhxRAhxRAhxRAhx 36
- (RAhxR)3
- RAhxRRAhxRRAhxR 37
- (RAhxR)2R
- RAhxRRAhxRR 38
- (RAhxR)2
- RAhxRRAhxR 39
- (RKAhx)4
- RKAhxRKAhxRKAhxRKAhx 40
- (RHAhx)4
- RHAhxRHAhxRHAhxRHAhx 41
II. Actividad biológica de conjugados de transportador-PMO
Los transportadores peptídicos descritos en la presente memoria facilitan el suministro de oligómeros sustancialmente sin carga a células eucariotas vivas, a la vez que potencian significativamente la actividad 5 antisentido, como se demuestra más adelante para los PMOs. En una realización, el oligómero es un oligómero de morfolino sustancialmente sin carga como se describió anteriormente.
El suministro celular puede implicar compartimentos tanto citoplasmáticos como nucleares de la célula. Por consiguiente, en realizaciones seleccionadas, el oligómero antisentido incluye una secuencia de bases eficaz para hibridarse con una secuencia diana que incluye un sitio de corte y empalme en un mRNA preprocesado (pre-mRNA) 10 seleccionado. El oligómero antisentido puede incluir también una secuencia de bases eficaz para hibridarse con una secuencia diana que incluye un sitio de iniciación de la traducción en un mRNA seleccionado. El oligómero antisentido puede incluir también una secuencia específica de bases eficaz para hibridarse con una secuencia diana requerida para la replicación viral. En otro aspecto, el oligómero antisentido puede ser un agente antibacteriano, por ejemplo, al dirigirse a RNA ribosómico u otros ácidos nucleicos bacterianos, como se describe, por ejemplo, en las
15 Publicaciones de Patentes PCT otorgadas en propiedad común con el solicitante de la presente números WO O1/49775 y WO O1/42457 (Publicación de los EE.UU. nº 2002/0082226).
Como se demuestra en la presente memoria, los péptidos de transporte como los anteriormente descritos potencian enormemente la entrada en la célula de compuestos ligados, con relación a la incorporación del compuesto en ausencia del componente peptídico de transporte ligado, y con relación a la incorporación mediante un componente 20 de transporte ligado que no tiene las subunidades Y. Tal incorporación potenciada se pone de manifiesto
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Por lo tanto, se incubaron células HeLa o NIH3T3 con el conjugado, y seguidamente se trataron con tripsina, como se describe más adelante en Materiales y Métodos, se lavaron y se volvieron a sembrar en placas. Las células tratadas con tripsina tenían mucha menos fluorescencia que las células no tratadas con tripsina (Figura 6), aunque los patrones de fluorescencia eran similares.
Como se muestra también en la Figura 6, ambos conjugados con L-transportador y D-transportador dieron perfiles de asociación e internalización idénticos; por lo tanto, la disminución de la fluorescencia tras el tratamiento con tripsina no puede atribuirse únicamente a la digestión del péptido R9F2C por la tripsina. Esto sugiere que el conjugado se asocia con proteína(s) de membrana, que son digeridas por la tripsina.
Habiéndose mostrado que la tripsina puede eliminar eficazmente la mayor parte del conjugado unido a la membrana, los factores que afectan a la internalización del conjugado pudieron estudiarse por citometría de flujo en células tratadas con tripsina. Como se muestra en la Figura 7A, se observan aumentos graduales de fluorescencia, debidos a la internalización del conjugado, hasta los 700 minutos desde la incubación. Se ve también que la internalización es dependiente de la temperatura y la concentración, como se muestra en la Figura 7B. El perfil mostrado en la Figura 7B es similar al mostrado por el marcador de endocitosis FM4-64 (un colorante lipófilo fluorescente que marca la membrana plasmática y sufre luego endocitosis de manera dependiente del tiempo, la temperatura y la energía). La internalización del conjugado resultó casi completamente inhibida en las células pre-incubadas con el inhibidor metabólico NaN3, lo que indica que la internalización del conjugado de péptido-PMO es un proceso dependiente de la energía.
B. Actividad antisentido en cultivo celular
Se ensayaron varios conjugados de oligómero-componente transportador conforme a la invención para determinar su actividad antisentido in vitro (Ejemplo 6). Los datos descritos más adelante se obtuvieron dirigiendo una secuencia de corrección de corte y empalme de β-globina, fusionada a luciferasa. Específicamente, en el ensayo se utilizan células HeLa transfectadas de manera estable con el plásmido pLuc/705, que tiene un gen de luciferasa interrumpido por un intrón de β-globina humana mutado en el nucleótido 705, causando así un corte y empalme incorrectos. Un oligonucleótido antisentido que se dirige al sitio de corte y empalme 705, cuando se suministra eficazmente, corrige el corte y empalme y permite la expresión de la luciferasa. Para una descripción adicional del plásmido y el ensayo, véanse, por ejemplo, Kang, Cho et al. 1998; Yoo, Sazani et al. 1999. Dado que el núcleo celular es el sitio de corte y empalme del pre-mRNA, estos datos demuestran el suministro del oligómero al núcleo celular.
Se ha mostrado previamente que un conjugado de un PMO antisentido de 18 monómeros (ID. SEC. nº 1) con el oligopéptido rTat(57-49) (ID. SEC. nº 12) inhibe el corte y empalme aberrantes en este ensayo (Moulton, Hase et al. 2003). Se llevaron a cabo ensayos comparativos usando conjugados de rTat(57-49) y conjugados que contenían moléculas transportadoras, como se muestra en la Figura 8.
Como se muestra en la Figura, un conjugado que consistía en el PMO antisentido enlazado, a través de un resto de cisteína, a un péptido que tiene la secuencia Arg9Phe2 (R9F2, ID. SEC. nº 13), era mucho más eficaz en cuanto a suprimir el corte y empalme aberrantes que los conjugados que contenían los péptidos rTat(57-49) (RRRQRRKKR) y R9, enlazados también al PMO a través de un resto de cisteína.
La Figura 9 proporciona el nivel de células HeLa viables tras 24 horas de incubación con varios de estos conjugados en una concentración de 25 µM, mostrando la baja toxicidad de los conjugados.
Las Figuras 10-14 muestran el efecto de varias modificaciones estructurales del transportador sobre la actividad antisentido de los conjugados de PMO-transportador. En cada figura, los resultados se expresan en unidades lumínicas relativas (RLU; del inglés, relative light units) normalizadas a microgramo de proteína, basadas en la expresión de luciferasa en el ensayo pLuc705 descrito anteriormente. En los conjugados representados en estas figuras, el PMO está ligado, a través de un resto de cisteína, al extremo C o lado derecho de la secuencia del transportador según se ha escrito, y al extremo 5', o lado izquierdo según se ha escrito, del PMO.
La Figura10 muestra el efecto de variar la naturaleza o longitud del segmento hidrófilo del transportador. Como se muestra, los transportadores que contenían fenilalanina (Phe o F) resultaron ser más eficaces que los transportadores que contenían isoleucina (Ile o I). No pareció que el aumento de la longitud del segmento hidrófobo de 2 a 3 y a 4 subunidades de aminoácido aumentara la eficacia.
Parece que el número total de argininas en el transportador es significativo a la vista de los datos que se muestran en la Figura 11. Como se muestra en ella, en los oligopéptidos de la serie RnF2, los oligopéptidos donde n era 6 o menos eran mucho menos eficaces que aquellos donde n era 8 o 9. Véase también Moulton, Nelson et al., 2004.
Como se muestra en la Figura 12, se puede alterar la posición del segmento hidrófobo. En los datos representados por F2R9, el segmento R9 está en el extremo C y está ligado al PMO. De manera significativa, los datos muestran que la secuencia de subunidades catiónicas puede ser no contigua (R5F2R4). Más adelante se proporcionan más ejemplos en la Figura 15.
19
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incorporación potenciada del PMO conjugado con péptido en comparación con el PMO no conjugado, como se muestra en la Figura 27.
El efecto de múltiples inyecciones de PMO conjugado con péptido sobre la incorporación relativa y el tiempo de permanencia in vivo se analizó del modo siguiente. Se inyectaron por vía intravenosa (vena de la cola) 150 µg de 5 R5F2R4-C-DSscr-FL a hembras de ratón Y10A de nueve meses de edad (n = 3) los días 0, 3, 5 y 7. Once días después de la inyección, se sacrificaron los ratones y se prepararon suspensiones celulares individuales a partir del bazo y cuatro ganglios linfáticos de cada ratón. El análisis citométrico de flujo sin tinción de ambas preparaciones celulares se realizó como se describió anteriormente. Un porcentaje sustancial tanto de esplenocitos (6,6% ± 2,6) como de linfocitos (4,3% ± 0,7) resultó positivo con respecto a la incorporación de R5F2R4-C-DSscr-FL.
10 Tabla de Lista de Secuencias
- Denominación
- Secuencia (5' a 3' o N-terminal a C-terminal) ID. SEC. nº
- 705
- 5'- CCT CTT ACC TCA GTT ACA - acetilo-3' 1
- 705-FL
- 5'- CCT CTT ACC TCA GTT ACA - fluoresceína-3' 1
- 7052MM
- 5'- CCT CTT AAC TCC GTT ACA - acetilo-3' 2
- 7054MM
- 5'- CCT ATT AAC TCC GTT CCA - acetilo-3' 3
- 705SCR
- 5'-CTC TCT CAC CAT TGA CAT - acetilo-3' 4
- c-myc
- 5'- ACG TTG AGG GGC ATC GTC GC-acetilo-3' 5
- DEN5'CS
- 5'- CGT TTC AGC ATA TTG AAA GG-3' 6
- DEN3'CS
- 5'- CCC AGC GTC AAT ATG CTG-3' 7
- DEN AUG
- 5'- GGT TAT TCA TCA GAG ATC TG-3' 8
- MHV lab
- 5'- GCC CAT CTT TGC CAT TAT GC-3' 9
- DSscr
- 5'-AGT CTC GAC TTG CTA CCT CA-3 10
- pTat
- CYGRKKRRQRRR 11
- rTat
- RRRQRRKKR 12
- R9F2
- RRRRRRRRRFF 13
- 2d-R9F2
- DRDRRRRRRRRFF (isómero mixto) 14
- D-R9F2
- DRDRDRDRDRDRDRDRDRDFDFD (isómero D) 15
- R9CF2
- RRRRRRRRRCFF 16
- R8CF2R
- RRRRRRRRCFFR 17
- R6CF2R3
- RRRRRRCFFRRR 18
- R5FCFR4
- RRRRRFCFRRRR 19
- R5F2R4
- RRRRRFFRRRR 20
- R4CF2R5
- RRRRCFFRRRRR 21
- R2CF2R7
- RRCFFRRRRRRR 22
- CF2R9
- CFFRRRRRRRRR 23
- CR9F2
- CRRRRRRRRRFF 24
- F2R9
- FFRRRRRRRRR 25
- R5F2CF2R4
- RRRRRFFCFFRRRR 26
- R9I2
- RRRRRRRRRII 27
- R8F3
- RRRRRRRRFFF 28
- R9F4
- RRRRRRRRRFFFF 29
- R8F2
- RRRRRRRRFF 30
- R6F2
- RRRRRRFF 31
- R5F2
- RRRRRFF 32
- (RRAhx)4
- RRAhxRRAhxRRAhxRRAhx 33
- (RAhxR)4
- RAhxRRAhxRRAhxRRAhxR 34
- (AhxRR)4
- AhxRRAhxRRAhxRRAhxRR 35
30
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EP1629105A2 (en) | 2006-03-01 |
EP2351844B1 (en) | 2014-06-11 |
WO2004097017A2 (en) | 2004-11-11 |
EP1629105B1 (en) | 2010-09-01 |
ATE479763T1 (de) | 2010-09-15 |
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