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Vol. 103. Núm. 3.
Páginas 105-117 (enero 2005)
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Vol. 103. Núm. 3.
Páginas 105-117 (enero 2005)
Acceso a texto completo
Expresión de proteínas relacionadas con resistencia a Múltiples Drogas (MDR-Proteínas) y resistencia a la quimioterapia en el cáncer de pulmón.
Visitas
3546
Alfredo Paredes-Lario1, Carlos Blanco-García2
1 Servicio de Oncología. Hospital Donostia. Donostia-San Sebastián. Gipuzkoa. España UE.
2 Departamento de Cirugía. Universidad del País Vasco. Donostia-San Sebastián. Gipuzkoa. España UE.
Miguel Echenique-Elizondo
Autor para correspondencia
gepecelm@sc.ehu.es

Correspondencia: Miguel Echenique-Elizondo. Departamento de Cirugía. Facultad de Medicina. UD San Sebastián. Universidad del País Vasco. Paseo Dr. Beguiristain, 105. 20014 Donostia-San Sebastián. Gipuzkoa. España UE. Tfno.+34- 943 017319. Fax +34-943 017 330
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Estadísticas
Resumen
Introducción

La reducción en la acumulación intracelular de los fármacos, es uno de los mecanismos más frecuentes de resistencia a los antineoplásicos. Las proteinas transportadoras de membrana juegan un papel esencial en éste fenómeno.

Material y Métodos

Se recogieron 147 muestras tumorales procedentes de 143 pacientes. De éstas, 35 eran broncoscópicas y 112 quirúrgicas. Resultaron válidas para el estudio 101 muestras correspondientes a 99 pacientes. Las muestras tumorales criocongeladas fueron sometidas a análisis inmunohistoquímico para la detección de las tres MDR-proteínas, Pgp, Mrp1 y Lrp

Resultados

No expresaban ninguna proteína, 16 casos. Expresaban una sola proteína, 32 casos: 3 Pgp, 11 Mrp1 y 18 Lrp=0. Expresaban dos proteínas, 34 casos: 24 Pgp y Lrp, 5 Mrp1 y Pgp, 5 Mrp1 y Lrp=0. Expresaban las tres proteínas, 17 casos.No hemos detectado relación significativa entre la edad y la expresión de Pgp (p=0.74), Mrp1 (p=0.95), o Lrp (p=0.26). No detectamos diferencias significativas entre sexos, tanto al analizar por el número (p=0.72), como por el tipo (p=0.39) de proteínas expresadas de forma simultánea.Tampoco detectamos diferencias significativas entre los diferentes estadios tumorales, tanto para el número (p=0.55), como para el tipo (p=0.21) de MDR-proteínas expresada. Tampoco detectamos diferencias significativas entre los diferentes grados histológicos, tanto para el número (p=0.59), como para el tipo (p=0.51) de MDR-proteínas expresadas simultáneamente esadas simultáneamente.

La tendencia de Pgp y Lrp a expresase asociadas ha resultado muy significativa (p<0.01), no ocurrió lo mismo para la sociación Pgp y Mrp1 (p=0.18) o Mrp1 y Lrp (p=0.26).

Conclusiones

El cáncer de pulmón expresa con frecuencia MDR-proteínas.De las tres MDR-proteínas estudiadas, Pgp Mrp1 y Lrp, es Lrp la más frecuentemente expresada. Los adenocarcinomas expresan menos Mrp1 que el resto de los tipos histológicos.Los carcinomas escamosos expresan menos Lrp que los adenocarcinomas y carcinomas indiferenciados de célula grande.Una proporción importante de pacientes expresan de forma simultánea más de una MDR-proteína.Los carcinomas escamosos, son los que con más frecuencia expresan Pgp, Mrp1 y Lrp de forma simultánea. Pgp se expresa fundamentalmente asociada a Lrp. La expresión de Pgp y el número de proteínas expresadas simultáneamente, puede afectar de forma negativa la respuesta a la quimioterapia.

Palabras clave:
MDR-proteinas
Cáncer
Pulmón
Summary
Background

Intracelular drug acumulation reduction plays an important role in resistente to chemotherapy in neoplasms. MDR-proteins regulate this cell activity.

Methods

-147 tumor simples were collected from 143 patients. 35 were done by bronchoscopy and 112 were surgical specimens. 101 samples from 99 patients were valid for the study. Cryopreservation and immunohystochemestry for detection of MDR-proteins:Pgp, Mrp1 y Lrp, was done by monoclocal murine Ab.

Results

16 cases did not expressed any protein.One protein was expressed in 32 cases: 3 Pgp, 11 Mrp1 and18 Lrp=0. Two proteins were expressed in 34 cases: 24 Pgp and Lrp, 5 Mrp1 y Pgp, 5 Mrp1 y Lrp=0. 17 cases expressed all three proteins, 17 casos. No diferences were observed in this expresión according to age: Pgp (p=0.74), Mrp1 (p=0.95), Lrp (p=0.26), sex:: numerical (p=0.72), type (p=0.39) of simultaneoulsy expressed proteins. Neither differences were observed according tumor: numerical (p=0.55), type(p=0.21)and pathology grade: both numerical (p=0.59) or type considered (p=0.51). Tendency of simultaneous expresión of Pgp and Lrp has been very significant a (p<0.01). The same was not observed in the association between Mrp1 and Lrp (p=0.26).

Conclussions

Lung cancer frequently express MDR-proteins. Lrp is the most frequent. Adenocarcinoma express less Mrp1 than the rest of patholy classes. Squamous carcinoma express less Lrp than adenocarcinoma and large-cell undifferenciatd carcinomas. More than two proteins are expressed simultaneously in significant number of cases. Squamous-cell carcinomas tend to express Pgp, Mrp1 and Lrp simultaneously. Pgp is expressed usually associated to Lrp. PgP expression and the number of MDR-proteins simultaneously may have influence on resistence to chemotherapy.

Key words:
MDR-proteins
Cancer
Lung
Laburpena
Sarrera

- Zelularen barru gertatzen den kimioterapikoa pilaketaren murriztasuna gaitasun handia du minbiziaren erresistentzia sor izan dadila erakusteko. MDR-proteinak gai honetan arakargarritasun berezia dute.

Metodoa

- 147 tumore zatiak 143 gaixoarengatik hartuak izan dira lan hau aurrera izana. 35 bronkoskopiaren bidez hatuak izan dira eta 112 ebakuntzaren bidezkoak. 101 zatiak, 99 gaixokoak baliozkoak izan dira ikerketa aurrera eraman izana. Kriopreserbazioa eta immunohistokimia- AK monoklonolaren bidez - MDR-proteinak azal izanal izateko erabili dira. Hiru proteinak nehurtuak izan dira: Pgp, Mrp1 eta Lrp.

Emaitzak

16 kasu ez zuten proteina bakarra era erakutsi. Proteina bat azaldu zen 32 kasuetan: 3 Pgp, 11 Mrp1 eta 18 Lrp=0. Bi proteinak azaldu ziren 34 kasutan: 24 Pgp eta Lrp, 5 Mrp1 eta Pgp, 5Mrp1 eta Lrp=0. 17 kasutan hiru proteinak azaltzen ziren. Ez dira ere ezberditasunik: numerikoa (p=0.72), mota (p=0.39) azaltzen diren proteina guzriak balorazia egin eta gero. Ez dira ere ezberditasunik sor tumorearen izentasuna kontutan harturik: numerikoa (p=0.55), mota (p=0.26) hartuak izan direnean.

Ondorioak

- Birikiko minbiziak maitz erakusten ditu MDR-proyeinaren azalpena, gehien bat Lrp. Adenokarzinomak gutxiago erakusten du Mrp1 beste tumore motare-kin konparatuz. Eskamoso motako minbiziak gutxiago azalten du Lrp adenokarzinoma eta gutxi diferentziatuak diren tumoreak baino. Bi baino proyein gehiago azaltzen dire kasu azalpena eta beste MDR-proteinarekin adoz duten azaltzeko erreztezuna kontutan harturik garrantzia izan daiteke birikiko minbiziaren dagoen erresistentzia kimioterapiarengan ondo uler izan dadila.

Giltza hitzak:
MDR-proteinak
Minbizia
Birika
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