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HspBP1 levels are elevated in breast tumor tissue and inversely related to tumor aggressiveness

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Cell Stress and Chaperones Aims and scope

Abstract

HspBP1 is a co-chaperone that binds to and regulates the chaperone Hsp70 (Hsp70 is used to refer to HSPA1A and HSPA1B). Hsp70 is known to be elevated in breast tumor tissue, therefore the purpose of these studies was to quantify the expression of HspBP1 in primary breast tumors and in serum of these patients with a follow-up analysis after 6 to 7 years. Levels of HspBP1, Hsp70, and anti-HspBP1 antibodies in sera of breast cancer patients and healthy individuals were measured by enzyme-linked immunosorbent assay. Expression of HspBP1 was quantified from biopsies of tumor and normal breast tissue by Western blot analysis. The data obtained were analyzed for association with tumor aggressiveness markers and with patient outcome. The levels of HspBP1 and Hsp70 were significantly higher in sera of patients compared to sera of healthy individuals. HspBP1 antibodies did not differ significantly between groups. HspBP1 levels were significantly higher in tumor (14.46 ng/μg protein, n = 51) compared to normal adjacent tissue (3.17 ng/μg protein, n = 41, p < 0.001). Expression of HspBP1 was significantly lower in patients with lymph node metastasis and positive for estrogen receptors. HspBP1 levels were also significantly lower in patients with a higher incidence of metastasis and death following a 6 to 7-year follow-up. The HspBP1/Hsp70 molar ratio was not associated with the prognostic markers analyzed. Our results indicate that low HspBP1 expression could be a candidate tumor aggressiveness marker.

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Acknowledgements

We wish to thank the patients that consented to participate in this study; Tiago Giuliane Lopes in the Pathology Department for the expert technical support with the histology studies; Dr. Moises Evandro Bauer for statistical support. Also, we wish to thank the financial support from FAPERGS, CNPq and the National Institute of General Medical Sciences (GM072628–02 (V.G.)).

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Authors and Affiliations

  1. Faculdade de Biociências e Instituto de Pesquisas Biomédicas, PUCRS, Av. Ipiranga, 6690 2o andar, 90610-000, Porto Alegre, RS, Brazil

    Ana Paula Souza, Caroline Albuquerque, Carolina Torronteguy, Fabio Maito, Luciana Pereira & Cristina Bonorino

  2. Centro de Mama, Hospital São Lucas, PUCRS. Av. Ipiranga, 6690, 90610-000, Porto Alegre, RS, Brazil

    Antonio Frasson & Felipe Zerwes

  3. Departamento de Patologia, Faculdade de Medicina, PUCRS, Av. Ipiranga, 6690, 90610–000, Porto Alegre, RS, Brazil

    Vinícius Duval da Silva

  4. Department of Animal Sciences, University of Arizona, Shantz Building, 232, 85721-0038, Tucson, AZ, USA

    Deborah Raynes & Vince Guerriero

  5. Department of Molecular and Cellular Biology, University of Arizona, Tucson, AZ, USA

    Vince Guerriero

Authors
  1. Ana Paula Souza
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  2. Caroline Albuquerque
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  3. Carolina Torronteguy
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  4. Antonio Frasson
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  5. Fabio Maito
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  6. Luciana Pereira
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  7. Vinícius Duval da Silva
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  8. Felipe Zerwes
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  9. Deborah Raynes
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  10. Vince Guerriero
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  11. Cristina Bonorino
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Corresponding author

Correspondence to Cristina Bonorino.

Additional information

This work was supported by FAPERGS, CNPq, and the National Institute of General Medical Sciences grant number GM072628-02 (V.G.)

The expression of HspBP1 (an Hsp70 co-chaperone) was analyzed in tumor samples and sera from breast cancer patients. HspBP1 is over expressed in these tumors and a seven year follow-up analysis found an association with a poor prognosis. Chaperones have been shown to play important roles in tumor biology and immunology; therefore, we believe the data in this study will serve as a basis for the formulation of a new hypothesis on chaperone-co-chaperone interactions and their role in tumor growth.

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Souza, A.P., Albuquerque, C., Torronteguy, C. et al. HspBP1 levels are elevated in breast tumor tissue and inversely related to tumor aggressiveness. Cell Stress and Chaperones 14, 301–310 (2009). https://doi.org/10.1007/s12192-008-0085-6

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  • DOI: https://doi.org/10.1007/s12192-008-0085-6

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