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Naunyn-Schmiedeberg's Archives of Pharmacology

, Volume 392, Issue 4, pp 415–426 | Cite as

Enhancement of tumor suppressor RAR-β protein expression by cationic liposomal-ATRA treatment in benzo(a)pyrene-induced lung cancer mice model

  • S. Viswanathan
  • V. M. Berlin GraceEmail author
  • J. Perinba Danisha
Original Article
  • 64 Downloads

Abstract

Targeting the specific molecular proteins or genes which are responsible for the suppression of cancer growth is currently an emerging molecular method to treat cancer. ATRA treatment is now considered as a molecular targeted therapy for many cancers. As ATRA exhibits its therapeutic effect through its receptors, this study was focused to investigate the effect and action of liposomal-ATRA treatment on the expression of RAR-β protein which is also a tumor suppressor. The liposomal-ATRA was developed with cationic DOTAP and cholesterol by thin-film formation method. The benzo(a)pyrene(50 mg/kg b.wt)-induced mice were treated with free and liposomal-ATRA(0.60 mg/kg b.wt). The RAR-β protein expression in lung and liver tissue samples were analyzed by immunohistochemistry (IHC) and western blotting (WB) on the 30th and 120th days. Almost nil expression of RAR-β protein was observed in B(a)P cancer control and liposome alone-treated groups. A comparatively elevated expression was seen in the free ATRA-treated group (IHC score—2+ in lung on the 120th day with band density of 14.46 ± 1.24% in WB). Interestingly, the liposomal-ATRA treatment demonstrated a significantly (p ≤ 0.01) higher RAR-β expression in lung (35.20 ± 3.398% band intensity and score 4+ in the 120th day) than that of in ATRA alone treatment. This study results indicate that the RAR-β protein expression was suppressed by B(a)P during cancer induction even on the 30th day itself. The treatment could reactivate the suppression and the lipo-ATRA treatment could show significantly higher RAR-β expression on the 120th day, which implies that it accumulated more ATRA in target site and sustained it for enhanced action.

Keywords

ATRA Liposomes RAR- β DOTAP Tumor suppressor Lung cancer 

Notes

Acknowledgments

The authors would like to acknowledge the Karunya Institute of Technology and Sciences for providing the instruments and laboratory facilities through Karunya Short-Term Research Grant to carry out the research and complete it successfully. We wish to acknowledge the help of technical assistant Mr. P. Jeya Kumar, Karunya Institute of Technology and Sciences, Mr. K. Pugazhendhi and Mr. Sakthi Vel, University of Madras in doing the Western blotting.

Author contribution statement

VS and BVM conceived and designed the research. VS and PDJ performed the experiments. VS, PDJ, and BVM analyzed the data. VS and BVM wrote the manuscript.

Funding information

Complete financial support was given by the Department of Science and Technology—Science and Engineering Research Board (DST-SERB) [SB/YS/LS-252/2013 (15 May, 2014)], Government of India, and partial financial support rendered by the Department of Biotechnology (DBT) [BT/PR14632/NNT/28/824/2015], Government of India.

Compliance with ethical standards

The approval for doing the animal experiment was obtained from the Institutional Animal Ethical Committee (IAEC/KU/BT/14/01) and was carried out as follows by following the guidelines of CPCSEA (Government of India): benzo(a)pyrene (50 mg/kg.b.wt in olive oil) was given twice in a week for four consecutive weeks via oral route administration to the mice (groups II to V).

Conflict of interest

The authors declare that they have no conflicts of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • S. Viswanathan
    • 1
  • V. M. Berlin Grace
    • 1
    Email author
  • J. Perinba Danisha
    • 1
  1. 1.Department of BiotechnologyKarunya Institute of Technology and SciencesCoimbatoreIndia

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