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Lymphoma

Functional cooperativity of p97 and histone deacetylase 6 in mediating DNA repair in mantle cell lymphoma cells

Leukemia volume 33, pages 1675–1686 (2019)Cite this article

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Abstract

p97 is an ATPase that works in concert with histone deacetylase 6 (HDAC6), to facilitate the degradation of misfolded proteins by autophagosomes. p97 has also been implicated in DNA repair and maintaining genomic stability. In this study, we determined the effect of combined inhibition of p97 and HDAC6 activities in mantle cell lymphoma (MCL) cells. We report that treatment with p97 inhibitors induces dose-dependent apoptosis in MCL cells. The p97 inhibitor CB-5083 induces ER stress markers GRP78 and CHOP and results in the accumulation of polyubiquitylated proteins. Co-treatment with CB-5083 and the HDAC6 inhibitor ACY-1215 result in marked downregulation of CDK4, Cyclin D1, and BRCA1 levels without inhibiting autophagic flux. Consequently, treatment with CB-5083 accentuates DNA damage in response to treatment with ACY-1215 resulting in enhanced accumulation of H2AX-γ and synergistic apoptosis. Furthermore, ATM loss severely impairs phosphorylation of 53BP1 following co-treatment with CB-5083 and ACY-1215 in response to gamma irradiation. Finally, co-treatment CB-5083 and ACY-1215 results in reduced tumor volumes and improves survival in Z138C and Jeko-1 xenografts in NSG mice. These observations suggest that combined inhibition of p97 and HDAC6 abrogates resolution of proteotoxic stress and impairs DNA repair mechanisms in MCL cells.

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Acknowledgements

The authors wish to acknowledge the Biorepository Core Facility of the University of Kansas Cancer Center for providing primary MCL and normal blood samples. RR is a recipient of the American Cancer Society-Institutional Research Grant (ACS-IRG-16-194-07). RAJ is a recipient of P30 CA168524 from NCI.

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Authors and Affiliations

  1. Division of Hematologic Malignancies and Cellular Therapeutics, The University of Kansas Cancer Center, Kanas City, KS, USA

    Pratikkumar H. Vekaria, Amar Kumar, Neil Dunavin, Anusha Vallurupalli, Siddhartha Ganguly, Joseph P. McGuirk & Rekha Rao

  2. Department of Cancer Biology, The University of Kansas Cancer Center, Kanas City, KS, USA

    Dharmalingam Subramaniam, Shrikant Anant & Rekha Rao

  3. Higuchi Biosciences Center, University of Kansas, Lawrence, KS, USA

    Frank Schoenen

  4. Department of Pathology & Laboratory Medicine, The University of Kansas Cancer Center, Kansas City, KS, USA

    Roy A. Jensen

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Vekaria, P.H., Kumar, A., Subramaniam, D. et al. Functional cooperativity of p97 and histone deacetylase 6 in mediating DNA repair in mantle cell lymphoma cells. Leukemia 33, 1675–1686 (2019). https://doi.org/10.1038/s41375-018-0355-y

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