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Liang J, Zhou F, Xiong X, Zhang X, Li S, Li X, Gao M, Li Y. Enhancing the retrograde axonal transport by curcumin promotes autophagic flux in N2a/APP695swe cells. Aging (Albany NY) 2019; 11:7036-7050. [PMID: 31488728 PMCID: PMC6756876 DOI: 10.18632/aging.102235] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 08/21/2019] [Indexed: 12/12/2022]
Abstract
The accumulation of autophagosomes and dysfunction at the axonal terminal of neurons play crucial roles in the genesis and development of Alzheimer’s disease (AD). Abnormalities in neuron axonal transport-related proteins prevent autophagosome maturation in AD. Curcumin, a polyphenol plant compound, has been shown to exert neuroprotective effects by increasing autophagy in AD, but the underlying mechanism of its effect on autophagy axon transport remains elusive. This study investigated the effects of curcumin on autophagosome formation and axonal transport in N2a/APP695swe cells (AD cell model) as well as the mechanism underlying those effects. Curcumin treatment significantly increased the expression of Beclin1, Atg5, and Atg16L1, induced the formation of autophagosomes, and promoted autophagosome–lysosome fusion in N2a/APP695swe cells. At the same time, curcumin promoted the expression of dynein, dynactin, and BICD2 as well as their binding to form the retrograde axonal transport molecular motor complex. Moreover, curcumin also increased the expression of the scaffolding proteins Rab7- interacting lysosomal protein (RILP) and huntingtin in N2a/APP695swe cells. Taken together, our findings indicate that curcumin increases autophagic flux by promoting interactions among autophagic axonal transport-related proteins and inducing lysosome–autophagosome fusion. This study provides evidence suggesting the potential use of curcumin as a novel treatment for AD.
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Affiliation(s)
- Jie Liang
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Fanlin Zhou
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Xiaomin Xiong
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Xiong Zhang
- Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Shijie Li
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Xiaoju Li
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Minna Gao
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
| | - Yu Li
- Department of Pathology, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China.,Institute of Neuroscience, School of Basic Medicine, Chongqing Medical University, Chongqing 400016, China
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Ahmad A, Ginnebaugh KR, Li Y, Padhye SB, Sarkar FH. Molecular targets of naturopathy in cancer research: bridge to modern medicine. Nutrients. 2015;7:321-334. [PMID: 25569626 PMCID: PMC4303842 DOI: 10.3390/nu7010321] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 12/23/2014] [Indexed: 01/10/2023] Open
Abstract
The relevance of naturopathy (defined as the practice of medicine for the treatment of human diseases with natural agents) in human cancer is beginning to be appreciated, as documented by renewed interest in nutraceutical research, the natural anticancer agents of dietary origin. Because of their pleiotropic effects and the ability to modulate multiple signaling pathways, which is a good attribute of natural agents, nutraceuticals have frequently been demonstrated to re-sensitize drug-resistant cancers. The effectiveness of nutraceuticals can be further enhanced if the tools for the relative assessment of their molecular targets are readily available. Such information can be critical for determining their most effective uses. Here, we discuss the anticancer potential of nutraceuticals and the associated challenges that have interfered with their translational potential as a naturopathic approach for the management of cancers. In the years to come, an efficient screening and assessment of molecular targets will be the key to make rapid progress in the area of drug design and discovery, especially focusing on evidence-based development of naturopathy for the treatment of human malignancies.
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