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Veterinary research2013; 44(1); 61; doi: 10.1186/1297-9716-44-61

BAG3 protects bovine papillomavirus type 1-transformed equine fibroblasts against pro-death signals.

Abstract: In human cancer cells, BAG3 protein is known to sustain cell survival. Here, for the first time, we demonstrate the expression of BAG3 protein both in equine sarcoids in vivo and in EqS04b cells, a sarcoid-derived fully transformed cell line harbouring bovine papilloma virus (BPV)-1 genome. Evidence of a possible involvement of BAG3 in equine sarcoid carcinogenesis was obtained by immunohistochemistry analysis of tumour samples. We found that most tumour samples stained positive for BAG3, even though to a different grade, while normal dermal fibroblasts from healthy horses displayed very weak staining pattern for BAG3 expression. By siRNA technology, we demonstrate in EqS04b the role of BAG3 in counteracting basal as well as chemical-triggered pro-death signals. BAG3 down-modulation was indeed shown to promote cell death and cell cycle arrest in G0/G1. In addition, we found that BAG3 silencing sensitized EqS04b cells to phenethylisothiocyanate (PEITC), a promising cancer chemopreventive/chemotherapeutic agent present in edible cruciferous vegetables. Notably, such a pro-survival role of BAG3 was less marked in E. Derm cells, an equine BPV-negative fibroblast cell line taken as a normal counterpart. Altogether our findings might suggest a mutual cooperation between BAG3 and viral oncoproteins to sustain cell survival.
Publication Date: 2013-07-22 PubMed ID: 23876161PubMed Central: PMC3729419DOI: 10.1186/1297-9716-44-61Google Scholar: Lookup
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  • Journal Article
  • Research Support
  • Non-U.S. Gov't

Summary

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The research investigates the role of BAG3 protein in protecting horse cells, transformed by bovine papillomavirus type 1, against signals that induce cell death. The outcome suggests that BAG3 protein helps these virus-transformed cells survive and could potentially cooperate with viral cancer-causing proteins for cell survival.

Background of the Research

  • Previous studies established that the BAG3 protein helps human cancer cells survive.
  • In this study, the researchers for the first time observed the expression of BAG3 protein in ‘sarcoids’ (a type of skin tumor) in horses, and in EqS04b cells, a cell line derived from horse sarcoids that contain bovine papillomavirus 1 (BPV-1) virus DNA.

Research Methodology

  • An immunohistochemical method was used to analyse tumour samples. Most of the tumor samples showed positive staining for BAG3, indicating the presence of the protein, while healthy cells showed a much weaker staining pattern.
  • The researchers used siRNA technology, a method used to silence gene expression, to diminish the role of BAG3 in the EqS04b cells.

Key Findings

  • Reducing BAG3 expression in the cells led to increased cell death and caused the cells to stop progressing through the cell cycle (cell cycle arrest at phase G0/G1).
  • Additionally, silencing BAG3 made EqS04b cells more sensitive to phenethylisothiocyanate (PEITC), which is a compound found in vegetables like broccoli and cabbage that has been heralded for its cancer prevention and treatment properties.
  • The pro-survival effect of BAG3 was less significant in E. Derm cells, a line of healthy horse cells that don’t contain the BPV virus, indicating that the virus may play a role in BAG3’s protective effect.

Conclusions and Implications

  • The findings suggest that there might be a collective effort between BAG3 and virus-induced cancer proteins to maintain cell survival.
  • This insight enhances the understanding of how cells transformed by BPV-1 manage to survive and possibly pave the way for developing new therapeutic interventions.

Cite This Article

APA
Cotugno R, Gallotta D, d'Avenia M, Corteggio A, Altamura G, Roperto F, Belisario MA, Borzacchiello G. (2013). BAG3 protects bovine papillomavirus type 1-transformed equine fibroblasts against pro-death signals. Vet Res, 44(1), 61. https://doi.org/10.1186/1297-9716-44-61

Publication

ISSN: 1297-9716
NlmUniqueID: 9309551
Country: England
Language: English
Volume: 44
Issue: 1
Pages: 61

Researcher Affiliations

Cotugno, Roberta
  • Department of Pharmacy, University of Salerno, Via Giovanni Paolo II n,132, 84084, Fisciano, Salerno, Italy. mabelisa@unisa.it.
Gallotta, Dario
    d'Avenia, Morena
      Corteggio, Annunziata
        Altamura, Gennaro
          Roperto, Franco
            Belisario, Maria Antonietta
              Borzacchiello, Giuseppe

                MeSH Terms

                • Animals
                • Apoptosis
                • Apoptosis Regulatory Proteins / metabolism
                • Bovine papillomavirus 1 / genetics
                • Bovine papillomavirus 1 / physiology
                • Carcinogenesis / pathology
                • Cell Cycle
                • Cell Line, Transformed
                • Cell Line, Tumor
                • Gene Silencing
                • Horse Diseases / pathology
                • Horse Diseases / virology
                • Horses
                • Humans
                • RNA, Small Interfering / metabolism
                • Skin Neoplasms / metabolism
                • Skin Neoplasms / veterinary
                • Skin Neoplasms / virology

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