Autophagy-Inducing Effect of Compound Berberine on CNE2 NPC Cells via Interference with the Targets in P13K/AKT/mTOR Signaling Pathway — Oak Academic Publishing
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Autophagy-Inducing Effect of Compound Berberine on CNE2 NPC Cells via Interference with the Targets in P13K/AKT/mTOR Signaling Pathway
Huaihua Municipal TCM Hospital, Huaihua, China
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Chinese Medicine University of Hunan, Changsha, China
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Chinese Medicine University of Hunan, Changsha, China
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Yueyang Municipal TCM Hospital, Yueyang, China
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Yueyang Municipal TCM Hospital, Yueyang, China
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The Second Municipal Hospital of Foshan, Foshan, China
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The First Affiliated Hospital, Chinese Medicine University of Hunan, Changsha, China
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Chinese Medicine University of Hunan, Changsha, China
,
Chinese Medicine University of Hunan, Changsha, China
,
Chinese Medicine University of Hunan, Changsha, China
1 Huaihua Municipal TCM Hospital, Huaihua, China
2 Chinese Medicine University of Hunan, Changsha, China
3 Chinese Medicine University of Hunan, Changsha, China
4 Yueyang Municipal TCM Hospital, Yueyang, China
5 Yueyang Municipal TCM Hospital, Yueyang, China
6 The Second Municipal Hospital of Foshan, Foshan, China
7 The First Affiliated Hospital, Chinese Medicine University of Hunan, Changsha, China
8 Chinese Medicine University of Hunan, Changsha, China
9 Chinese Medicine University of Hunan, Changsha, China
10 Chinese Medicine University of Hunan, Changsha, China
Objective: To investigate the autophagy-inducing effect of Compound Berberine (CBBR) on CNE2 nasopharyngeal carcinoma (NPC) cells and its possible targets in P13K/AKT/mTOR signaling pathway. Methods: CNE2 cells at exponential growth phase were taken as the target cells in this study. Firstly, IC50 concentration for CBBR was determined by MTT assay. Then, 3 different concentrations of CBBR, 0.25 mg ⋅ mL − 1 , 0.50 mg ⋅ mL − 1 and 1.00 mg ⋅ mL − 1 , around the concentration of IC50, were taken for followed intervention experiments respectively. Fluorescein labeling method was utilized to assay the inducing effect of CBBR on the autophagic activity of CNE2 cells, followed by Western blot procedure to explore the changes of key messenger molecules in the autophagy-related signaling pathway of P13K/AKT/mTOR, both combined with 3-MA block test in a comparative way and carried out by detecting the expressive levels of Beclin 1, LC3-II and LC3-I as well as the ratio of LC3-II:LC3-I. Results: IC50 of CBBR was determined at the level of 0.5 mg ⋅ mL − 1 . The inducing effect of CBBR on autophagy of CNE2 cells was shown occurring in various modes, not a simple concentration-dependent tendency, with its effect minimal at the concentration of 0.25 mg ⋅ mL − 1 and maximal at the concentration of 0.50 mg ⋅ mL − 1 , while only slightly higher at the concentration of 1.00 mg ⋅ mL − 1 than that of 0.5 mg ⋅ mL − 1 . Although its inducing effect was weakened a little following the pretreatment by 3-MA, the effect combined with CBBR was still significantly higher than that of simply blocked by 3-MA. Moreover, changes in the expressive levels of Beclin1, LC3-II and LC3-I as well as LC3-II:LC3-I all showed a tendency corresponding to the changed autophagic features of CNE2 cells (P < 0.05 or P < 0.01), given more supporting evidences for the effect of CBBR on autophagy of CNE2 cells. Conclusions: CBBR can bring about inhibiting effect on the proliferating activity of CNE2 cells through inducing increased autophagic activity via intervening targets in P13K/AKT/mTOR signaling pathway, and this effect could not be completely blocked by the antagonist 3-MA.
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