Cancer Chemotherapy and Pharmacology

, Volume 74, Issue 4, pp 787–798 | Cite as

Anticancer activity of VDR-coregulator inhibitor PS121912

  • Preetpal S. Sidhu
  • Kelly Teske
  • Belaynesh Feleke
  • Nina Y. Yuan
  • Margaret L. Guthrie
  • Grant B. Fernstrum
  • Nishita D. Vyas
  • Lanlan Han
  • Joshua Preston
  • Jonathan W. Bogart
  • Nicholas R. Silvaggi
  • James M. Cook
  • Rakesh K. Singh
  • Daniel D. Bikle
  • Leggy A. Arnold
Original Article

Abstract

Purpose

PS121912 has been developed as selective vitamin D receptor (VDR)-coregulator inhibitor starting from a high throughput screening campaign to identify new agents that modulate VDR without causing hypercalcemia. Initial antiproliferative effects of PS121912 were observed that are characterized herein to enable future in vivo investigation with this molecule.

Methods

Antiproliferation and apoptosis were determined using four different cancer cell lines (DU145, Caco2, HL-60 and SKOV3) in the presence of PS121912, 1,25-(OH)2D3, or a combination of 1,25-(OH)2D3 and PS121912. VDR si-RNA was used to identify the role of VDR during this process. The application of ChIP enabled us to determine the involvement of coregulator recruitment during transcription, which was investigated by RT-PCR with VDR target genes and those affiliated with cell cycle progression. Translational changes of apoptotic proteins were determined with an antibody array. The preclinical characterization of PS121912 includes the determination of metabolic stability and CYP3A4 inhibition.

Results

PS121912 induced apoptosis in all four cancer cells, with HL-60 cells being the most sensitive. At sub-micromolar concentrations, PS121912 amplified the growth inhibition of cancer cells caused by 1,25-(OH)2D3 without being antiproliferative by itself. A knockout study with VDR si-RNA confirmed the mediating role of VDR. VDR target genes induced by 1,25-(OH)2D3 were down-regulated with the co-treatment of PS121912. This process was highly dependent on the recruitment of coregulators that in case of CYP24A1 was SRC2. The combination of PS121912 and 1,25-(OH)2D3 reduced the presence of SRC2 and enriched the occupancy of corepressor NCoR at the promoter site. E2F transcription factors 1 and 4 were down-regulated in the presence of PS121912 and 1,25-(OH)2D3 that in turn reduced the transcription levels of cyclin A and D, thus arresting HL-60 cells in the S or G2/M phase. In addition, proteins with hematopoietic functions such as cyclin-dependent kinase 6, histone deacetylase 9 and transforming growth factor beta 2 and 3 were down-regulated as well. Elevated levels of P21 and GADD45, in concert with cyclin D1, also mediated the antiproliferative response of HL-60 in the presence of 1,25-(OH)2D3 and PS121912. Studies at higher concentration of P121912 identified a VDR-independent pathway of antiproliferation that included the enzymatic and transcriptional activation of caspase 3/7.

Conclusion

Overall, we conclude that PS121912 behaves like a VDR antagonist at low concentrations but interacts with more targets at higher concentrations leading to apoptosis mediated by caspase 3/7 activation. In addition, PS121912 showed an acceptable metabolic stability to enable in vivo cancer studies.

Keywords

Vitamin D receptor VDR-coregulator inhibitor Leukemia Cell cycle regulation Apoptosis HL-60 3-Indolylmethanamine 

Notes

Acknowledgments

This work was supported by the University of Wisconsin-Milwaukee [LAA], the UWM Research Growth Initiative (RGI grant 2012) [LAA], the NIH R03DA031090 [LAA], the UWM Research Foundation (Catalyst grant), the Lynde and Harry Bradley Foundation [LAA], the Richard and Ethel Herzfeld Foundation [LAA], RO1 AR050023 [DDB], and Swim Across America and Women and Infants’ Hospital of Rode Island [RKS].

Supplementary material

280_2014_2549_MOESM1_ESM.pdf (35 kb)
Supplementary material 1 (PDF 35 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Preetpal S. Sidhu
    • 1
  • Kelly Teske
    • 1
  • Belaynesh Feleke
    • 1
  • Nina Y. Yuan
    • 1
  • Margaret L. Guthrie
    • 1
  • Grant B. Fernstrum
    • 1
  • Nishita D. Vyas
    • 1
  • Lanlan Han
    • 1
  • Joshua Preston
    • 1
  • Jonathan W. Bogart
    • 1
  • Nicholas R. Silvaggi
    • 1
  • James M. Cook
    • 1
  • Rakesh K. Singh
    • 2
  • Daniel D. Bikle
    • 3
  • Leggy A. Arnold
    • 1
  1. 1.Department of Chemistry and BiochemistryUniversity of Wisconsin-MilwaukeeMilwaukeeUSA
  2. 2.Molecular Therapeutics Laboratory, Program in Women’s Oncology, Department of Obstetrics and Gynecology, Woman and Infant’s Hospital of Rhode IslandAlpert Medical School of Brown UniversityProvidenceUSA
  3. 3.Endocrine Research Unit, Department of MedicineVeterans Affairs Medical CenterSan FranciscoUSA

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