Orthotopic tumorgrafts in nude mice as a model to evaluate calcitriol effects in breast cancer.
Braz J Biol
; 77(4): 856-867, 2017 Nov.
Article
em En
| MEDLINE
| ID: mdl-28492801
ABSTRACT
OBJECTIVES:
Calcitriol antiproliferative effects were observed in xenografts of breast cancer cell lines, however they were not yet investigated in tumorgrafts, consisting of freshly collected breast cancer samples xenografted into animals. To establish a tumorgraft model, from freshly collected breast cancer samples, which were directly implanted in nude mice, to study calcitriol effects.METHODS:
Breast cancer samples collected from 12 patients were orthotopically implanted into nude mice. Animals were treated with weekly intratumoral injections of calcitriol 3 µg/Kg, which was previously shown to induce peak serum calcitriol levels in the predicted therapeutic range.RESULTS:
Success engraftment rate was 25%. Tumorgrafts were established from aggressive (HER2 positive or histological grade 3) highly proliferative samples and original tumor characteristics were preserved. Calcitriol highly induced its target gene, CYP24A1, indicating that the genomic vitamin D pathway is active in tumorgrafts. However, no differences in the expression of proliferation and apoptosis markers (BrdU incorporation, Ki67, CDKN1A, CDKN1B, BCL2 expression) were observed in these highly proliferative tumor samples.CONCLUSIONS:
Tumorgrafts seem a promising model to explore other calcitriol doses and regimens, considering the heterogeneity of the disease and microenvironment interactions.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Vitaminas
/
Neoplasias da Mama
/
Calcitriol
Tipo de estudo:
Prognostic_studies
Limite:
Animals
Idioma:
En
Revista:
Braz J Biol
Assunto da revista:
BIOLOGIA
Ano de publicação:
2017
Tipo de documento:
Article
País de afiliação:
Brasil