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Article

RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells

  • Authors:
    • Valeria Alejandra Ferretti
    • Romina Canzoneri
    • Sabina Palma
    • Ezequiel Lacunza
    • Claudio Marcelo Aldaz
    • Martín Carlos Abba
  • View Affiliations / Copyright

    Affiliations: Basic and Applied Immunological Research Center, School of Medical Sciences, National University of La Plata, La Plata, Buenos Aires CP1900, Argentina, Department of Epigenetics and Molecular Carcinogenesis, The University of Texas M.D. Anderson Cancer Center, Science Park, Smithville, TX 78957, USA
  • Article Number: 157
    |
    Published online on: June 8, 2021
       https://doi.org/10.3892/or.2021.8108
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Abstract

Rhomboid pseudoproteases are catalytically inactive members of the rhomboid superfamily that modulate the traffic, turnover and activity of their target proteins. Rhomboid domain containing 2 (RHBDD2) is a rhomboid family member overexpressed during mammary gland development and advanced stages of breast cancer. Interactome profiling studies have identified RHBDD2 as a novel binding partner of WW domain‑containing oxidoreductase (WWOX) protein. The present study characterized the RHBDD2‑WWOX interaction in proliferating and differentiated stages of normal mammary and breast cancer cells by co‑immunoprecipitation and confocal microscopy. Normal breast and proliferating cancer cells showed significantly increased RHBDD2 mRNA levels compared with their differentiated counterparts. WWOX mRNA was primarily expressed in differentiated cells. WWOX co‑precipitated with RHBDD2, indicating that endogenous RHBDD2 and WWOX were physically associated in normal and breast cancer proliferating cells compared with the differentiated stage. Co‑localization assays corroborated the co‑immunoprecipitation results, demonstrating the RHBDD2‑WWOX protein interaction in normal and proliferating breast cancer cells. RHBDD2 harbors a conserved LPPY motif at the C‑terminus region that directly interacted with the WW domains of WWOX. Since WWOX serves as an inhibitor of the TGFβ/SMAD3 signaling pathway in breast cells, modulation of SMAD3 target genes was analyzed in proliferating and differentiated mammary cells and in RHBDD2 silencing assays. Increased expression levels of SMAD3‑regulated genes were detected in proliferating cells compared with their differentiated counterparts. Follistatin and angiopoietin‑like 4 mRNA was significantly downregulated in RHBDD2 transiently silenced cells compared with scrambled control small interfering RNA. Based on these results, WWOX was suggested to be a novel RHBDD2 target protein involved in the modulation of breast epithelial cell proliferation and differentiation.
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Copy and paste a formatted citation
Spandidos Publications style
Ferretti VA, Canzoneri R, Palma S, Lacunza E, Aldaz CM and Abba MC: RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells. Oncol Rep 46: 157, 2021.
APA
Ferretti, V.A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C.M., & Abba, M.C. (2021). RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells. Oncology Reports, 46, 157. https://doi.org/10.3892/or.2021.8108
MLA
Ferretti, V. A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C. M., Abba, M. C."RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells". Oncology Reports 46.2 (2021): 157.
Chicago
Ferretti, V. A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C. M., Abba, M. C."RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells". Oncology Reports 46, no. 2 (2021): 157. https://doi.org/10.3892/or.2021.8108
Copy and paste a formatted citation
x
Spandidos Publications style
Ferretti VA, Canzoneri R, Palma S, Lacunza E, Aldaz CM and Abba MC: RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells. Oncol Rep 46: 157, 2021.
APA
Ferretti, V.A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C.M., & Abba, M.C. (2021). RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells. Oncology Reports, 46, 157. https://doi.org/10.3892/or.2021.8108
MLA
Ferretti, V. A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C. M., Abba, M. C."RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells". Oncology Reports 46.2 (2021): 157.
Chicago
Ferretti, V. A., Canzoneri, R., Palma, S., Lacunza, E., Aldaz, C. M., Abba, M. C."RHBDD2‑WWOX protein interaction during proliferative and differentiated stages in normal and breast cancer cells". Oncology Reports 46, no. 2 (2021): 157. https://doi.org/10.3892/or.2021.8108
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