A novel preclinical method to quantitatively evaluate early-stage metastatic events at the murine blood-brain barrier.
Cancer Prev Res (Phila)
; 8(1): 68-76, 2015 Jan.
Article
en En
| MEDLINE
| ID: mdl-25348853
ABSTRACT
The observation that approximately 15% of women with disseminated breast cancer will develop symptomatic brain metastases combined with treatment guidelines discouraging single-agent chemotherapeutic strategies facilitates the desire for novel strategies aimed at outright brain metastasis prevention. Effective and robust preclinical methods to evaluate early-stage metastatic processes, brain metastases burden, and overall mean survival are lacking. Here, we develop a novel method to quantitate early metastatic events (arresting and extravasation) in addition to traditional end time-point parameters such as tumor burden and survival in an experimental mouse model of brain metastases of breast cancer. Using this method, a reduced number of viable brain-seeking metastatic cells (from 3,331 ± 263 cells/brain to 1,079 ± 495 cells/brain) were arrested in brain one week postinjection after TGFß knockdown. Treatment with a TGFß receptor inhibitor, galunisertib, reduced the number of arrested cells in brain to 808 ± 82 cells/brain. Furthermore, we observed a reduction in the percentage of extravasated cells (from 63% to 30%) compared with cells remaining intralumenal when TGFß is knocked down or inhibited with galunisertib (40%). The observed reduction of extravasated metastatic cells in brain translated to smaller and fewer brain metastases and resulted in prolonged mean survival (from 36 days to 62 days). This method opens up potentially new avenues of metastases prevention research by providing critical data important to early brain metastasis of breast cancer events.
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Neoplasias Encefálicas
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Barrera Hematoencefálica
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Modelos Animales de Enfermedad
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Neoplasias Mamarias Experimentales
Tipo de estudio:
Guideline
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Prognostic_studies
Límite:
Animals
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Female
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Humans
Idioma:
En
Revista:
Cancer Prev Res (Phila)
Asunto de la revista:
NEOPLASIAS
Año:
2015
Tipo del documento:
Article