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Medical Science Monitor Basic Research


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Proteasome Inhibitor Carbobenzoxy-L-Leucyl-L-Leucyl-L-Leucinal (MG132) Enhances Therapeutic Effect of Paclitaxel on Breast Cancer by Inhibiting Nuclear Factor (NF)-κB Signaling

Yunjing Zhang, Bin Yang, Jinping Zhao, Xiaoli Li, Long Zhang, Zhenhua Zhai

(The Laboratory of Tumor Angiogenesis and Microenvironment, The First Hospital Affiliated to Jinzhou Medical University, Jinzhou, Liaoning, China (mainland))

Med Sci Monit 2018; 24: ANS294-304

DOI: 10.12659/MSM.908139

BACKGROUND: Carbobenzoxy-L-leucyl-L-leucyl-L-leucinal (MG132), a peptide aldehyde proteasome inhibitor, can inhibit tumor progression by inactivating nuclear factor (NF)-κB signaling. Paclitaxel (PTX) is part of a routine regimen for the treatment of breast cancer. However, activation of the NF-κB pathway after treatment with PTX confers insensitivity to this drug. This study investigated the potential effect of MG132 as a co-treatment with PTX against breast cancer, and clarifies the underlying molecular mechanisms.
MATERIAL AND METHODS: Breast cancer cells were treated with PTX, MG132, or PTX plus MG132, and the therapeutic effects were evaluated phenotypically. A mouse model of breast cancer was used to determine the combined effect of PTX plus MG132 in vivo.
RESULTS: Treatment with PTX plus MG132 suppressed aggressive phenotypes of breast cancer cells more effectively than PTX alone. Consistently, MG132 also enhanced the suppressive effect of PTX on tumor growth in C57BL/6 mice. Significantly, activation of the NF-κB pathway by PTX was attenuated by MG132.
CONCLUSIONS: Based on our findings, we suggest the application of MG132 in clinical practice in combination with PTX for the treatment of breast cancer.

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