Abstract
The aim of this study was to explore the efficacy of intravesical Thalidomide (immunomodulatory, anti-inflammatory and anti-angiogenic) added to BCG using an immune competent autochthonous orthotopic NMIBC animal model. Female Fischer 344 rats, 7 weeks of age, received every 2 weeks for four times, a dose of 1.5 mg/kg of N-methyl-N-nitrosourea (MNU) intravesically. The rats were randomized into four groups (n = 10 per group) to receive intravesical treatment once a week for 6 weeks as follows: control (0.2 ml vehicle), BCG (2 × 106 CFU of Connaught strain in 0.2 ml), Thalidomide (20 mg/kg in 0.2 ml) and BCG-Thalidomide in 0.2 ml. At week 15, bladders were collected for histopathology, cell turnover index by immunohistochemistry and immunoblotting quantification of 4E-BP1 and p70S6K1 for downstream mTOR proliferation signaling and HIF and VEGF for angiogenesis pathway. Thalidomide-BCG association showed a trend for normal histopathology and down-regulation of cell turnover, p70S6K1, HIF-1 and VEGF. 4E-BP1 was up-regulated by treatment, especially in the Thalidomide groups, supporting that its regulation occurs independently of p70S6K1 on mTOR pathway in NMIBC. Intravesical BCG-Thalidomide might represent a significant increment in NMIBC treatment, suggesting p70S6K1, HIF-1 and VEGF as potential molecular target candidates in a clinically relevant immune competent NMIBC model.
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Abbreviations
- NMIBC:
-
Non-muscle invasive bladder cancer
- BCG:
-
Bacillus Calmette-Guérin
- IMiDs:
-
Immunomodulatory Thalidomide analogs
- MNU:
-
N-Methyl-N-nitrosourea
- BSA:
-
Bovine serum albumin
- HRP:
-
Horseradish peroxidase
- VEGF:
-
Vascular endothelial growth factor
- HIF:
-
Hypoxia-inducible factor
- mTOR:
-
Mammalian target of rapamycin
- 4E-BP1:
-
Elongation-initiation factor 4E-binding protein 1
- p70S6K1:
-
p70S6 kinase-1
- p:
-
Phosphorylated
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Funding was provided by CAPES, Brazil (Grant No. BEX 14679/13-2), and CNPq Research Productivity, Brazil (Grant No. 302622/2015-2).
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GRP helped in data collection, data analysis and manuscript writing; JAC and KLF collected and analyzed the data and wrote the manuscript; ACM collected and analyzed the data and edited the manuscript; MJAS contributed to manuscript editing and funding acquisition; and LOR helped in project development, funding acquisition, manuscript editing and supervision.
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Passos, G.R., Camargo, J.A., Ferrari, K.L. et al. Intravesical Thalidomide boosts bacillus Calmette-Guérin (BCG) in non-muscle invasive bladder cancer treatment. Med Oncol 35, 3 (2018). https://doi.org/10.1007/s12032-017-1067-2
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DOI: https://doi.org/10.1007/s12032-017-1067-2