Doxycycline synergizes with doxorubicin to inhibit the proliferation of castration-resistant prostate cancer cells.

Abstract:

:Castration-resistant prostate cancer (CRPC) is fatal and there is currently no effective clinical treatment. The antibiotic doxycycline has shown anti-cancer effect in several kinds of solid tumors including prostate cancer. In this study, a combination of doxycycline and doxorubicin was used to investigate the synergistic effect on CRPC cells. MTT assay was employed to determine the viability of cells in two-dimensional (2D) cultures. Apoptosis was determined by Annexin V/propidium iodide (PI) double staining assay. Cell cycle was analyzed by PI staining, and reverse transcription-PCR (RT-PCR) was used to determine the expressions of apoptosis-related genes at mRNA level. Western blot analysis was used to analyze the expressions of Bcl-2, Bax, and Poly (ADP-ribose) polymerase proteins. Cytotoxicity assay and morphological observation of PC3 cells in three-dimensional (3D) cultures were used to determine the effect of combination treatment. Results showed that doxycycline combined with doxorubicin significantly inhibited PC3 cells in both 2D and 3D cultures, enhanced apoptosis, and increased the accumulation of cells in G2/M phase. RT-PCR showed down-regulation of Bcl-2 and up-regulation of Bax mRNA after combination treatment. Meanwhile, western blot analysis showed that combination treatment resulted in down-regulation of Bcl-2 protein and up-regulation of Bax protein, and that PARP cleavage was obviously exhibited after combination treatment. Confocal imaging analysis indicated that doxorubicin penetrated deeply into the core of spheroids when combined with doxycycline. These data indicated that doxycycline in combination with doxorubicin had a synergistic effect on PC3 cells and may provide a potential novel strategy for the treatment of CRPC.

authors

Zhu C,Yan X,Yu A,Wang Y

doi

10.1093/abbs/gmx097

subject

Has Abstract

pub_date

2017-11-01 00:00:00

pages

999-1007

issue

11

eissn

1672-9145

issn

1745-7270

pii

4161383

journal_volume

49

pub_type

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