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Heat-Killed and Live Enterococcus faecalis Attenuates Enlarged Prostate in an Animal Model of Benign Prostatic Hyperplasia

  • Choi, Young-Jin (Department of Food Science and Nutrition, Dong-A University) ;
  • Fan, Meiqi (Division of Food Bioscience, College of Biomedical and Health Sciences, Konkuk University) ;
  • Tang, Yujiao (School of Bio-Science and Food Engineering, Changchun University of Science and Technology) ;
  • Iwasa, Masahiro (R&D Center, Korea BeRM Co., Ltd.) ;
  • Han, Kwon-Il (R&D Center, Korea BeRM Co., Ltd.) ;
  • Lee, Hongchan (Wiebien Hospital) ;
  • Hwang, Ji-Young (Department of Food Science and Technology, Dong-Eui University) ;
  • Lee, Bokyung (Department of Food Science and Nutrition, Dong-A University) ;
  • Kim, Eun-Kyung (Department of Food Science and Nutrition, Dong-A University)
  • Received : 2021.02.23
  • Accepted : 2021.06.08
  • Published : 2021.08.28

Abstract

In the present study, we investigated the inhibitory effect of heat-killed Enterococcus faecalis (E. faecalis) and live E. faecalis on benign prostatic hyperplasia (BPH). The BPH rat model was established by administering male rats with testosterone propionate (TP, 5 mg/kg, in corn oil) via subcutaneous injections daily for four weeks after castration. The rats were divided into five groups: Con, corn oil-injected (s.c.) + DW administration; BPH, TP (5 mg/kg, s.c.) + DW administration; BPH+K_EF, TP (5 mg/kg, s.c.) + heat-killed E. faecalis (7.5 × 1012 CFU/g, 2.21 mg/kg) administration; BPH+L_EF, TP (5 mg/kg, s.c.) + live E. faecalis (1 × 1011 CFU/g, 166 mg/kg) administration; BPH+Fi, TP (5 mg/kg, s.c.) + finasteride (1 mg/kg) administration. In both of BPH+K_EF and BPH+L_EF groups, the prostate weight decreased and histological changes due to TP treatment recovered to the level of the Con group. Both of these groups also showed regulation of androgen-signaling factors, growth factors, and apoptosis-related factors in prostate tissue. E. faecalis exhibited an inhibitory effect on benign prostatic hyperplasia, and even heat-killed E. faecalis showed similar efficacy on the live cells in the BPH rat model. As the first investigation into the effect of heat-killed and live E. faecalis on BPH, our study suggests that heat-killed E. faecalis might be a food additive candidate for use in various foods, regardless of heat processing.

Keywords

Acknowledgement

This work was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (NRF- 2020R1A2C1014798 and BB21+Project in 2021.

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