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| Author(s): |
Yuri Nagamine Urata
Total Authors: 1
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| Document type: | Doctoral Thesis |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Faculdade de Medicina (FM/SBD) |
| Defense date: | 2010-08-30 |
| Examining board members: |
Maria Aparecida Azevedo Koike Folgueira;
Maria Mitzi Brentani;
Dirce Maria Carraro;
Fernando Salvador Moreno;
Célia Regina Nogueira
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| Advisor: | Maria Aparecida Azevedo Koike Folgueira |
| Abstract | |
Low 25(OH)2D3 or 1,25(OH)2D3 serum levels may be associated with breast cancer incidence and prognosis. Additionally, the antiproliferative effects of vitamin D are observed in breast cancer cell lines exposed to phamacological doses of calcitriol (1,25(OH)2D3, 100nM). Vitamin D supplementation is indicated for post-menopausal women to prevent osteoporosis and a previous study from our group observed a reduced tumor proliferative index after calcitriol supplementation on post menopausal breast cancer patients. However, there is no study that verifies the effect of vitamin D on gene expression profile in vivo so far. Thirty one post menopausal breast cancer patients were included on our analysis. They were supplemented with calcitriol after tumor biopsy (0.50g/day, indicated dose for osteoporosis prevention) for a short period of time (median 32 days). Tumor samples were collected during biopsy (before supplementation) and breast surgery (after supplementation). Gene expression profile of 16 patients was analyzed using the U133 Plus 2.0 Affymetrix Gene Chips from 100ng of total RNA. After supplementation, a reduced expression of Ki-67 was observed. Among the differentially expressed genes, EGR1, FOS, DUSP1, MMP12 and RGS1 were upregulated after calcitriol supplementation. Differentially expressed genes were involved in inflammatory response or were associated with the membrane. Our results indicate that calcitriol supplementation diminish tumor proliferation index regulating inflammatory pathways . (AU) | |