Abstract
In a previous study, we measured caveolin-1 protein levels, both in the normal breast and in breast cancer. The study revealed no association between caveolin-1 expression in the epithelial compartment and clinical disease outcome. However, high levels of caveolin-1 in the stromal tissue surrounding the tumor associated strongly with reduced metastasis and improved survival. Using an animal model, we found that the onset of mammary tumors driven by Her-2/neu expression was accelerated in mice lacking caveolin-1. We have analysed the heat shock protein (Hsp) response in the tumors of mice lacking caveolin-1. In all cases, the mammary tumors were estrogen and progesterone receptor negative, and the levels of Her-2/neu (evaluated by immunohistochemistry) were not different between the caveolin-1 +/+ (n = 8) and the caveolin-1 −/− (n = 7) tumors. However, a significant reduction in the extent of apoptosis was observed in mammary tumors from animals lacking caveolin-1. While Bcl-2, Bax, and survivin levels in the tumors were not different, the amount of HSPA (Hsp70) was almost double in the caveolin-1 −/− tumors. In contrast, HSPB1 (Hsp27/Hsp25) levels were significantly lower in the caveolin-1 −/− tumors. The mammary tumors from caveolin-1 null mice expressed more HSPC4 (gp96 or grp94), but HSPC1 (Hsp90), HSPA5 (grp78), HSPD1 (Hsp60), and CHOP were not altered. No significant changes in these proteins were found in the stroma surrounding these tumors. These results demonstrate that the disruption of the Cav-1 gene can cause alterations of specific Hsps as well as tumor development.
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Abbreviations
- ER:
-
Estrogen receptor
- HSF-1:
-
Heat shock factor-1
- Her-2/neu:
-
c-erbB-2
- Hsp:
-
Heat shock protein
- IHC:
-
Immunohistochemistry
- PCNA:
-
Proliferating cell nuclear antigen
- PR:
-
Progesterone receptor
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Acknowledgments
This work was supported by the National Research Council of Argentina (CONICET) (PIP 2428 to DRC), the Agencia Nacional de Promoción Científica y Tecnológica of Argentina (PICT 1047, 2007, préstamo BID, DRC), the Argentina Foundation for Cancer Research (DRC) and by grants from the Susan G. Komen for the Cure (BCTR0403075 to RLA) and from the Cancer Council Victoria (RLA) and by a fellowship from the National Breast Cancer Foundation of Australia (RLA). This work is part of the Thesis (FDCC) for the PROBIOL, UNCuyo, Mendoza, Argentina.
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D. R. Ciocca and F. D. Cuello-Carrión contributed equally to this work.
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Ciocca, D.R., Cuello-Carrión, F.D., Natoli, A.L. et al. Absence of caveolin-1 alters heat shock protein expression in spontaneous mammary tumors driven by Her-2/neu expression. Histochem Cell Biol 137, 187–194 (2012). https://doi.org/10.1007/s00418-011-0879-y
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DOI: https://doi.org/10.1007/s00418-011-0879-y