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Mol Neurodegener. 2018 Jan 30;13(1):4. doi: 10.1186/s13024-018-0236-x.

Piperine ameliorates SCA17 neuropathology by reducing ER stress.

Guo J1,2, Cui Y1,2, Liu Q1,2, Yang Y1,2, Li Y2, Weng L1, Tang B1, Jin P2, Li XJ2,3, Yang S4, Li S5,6.

Author information

1
Department of Neurology and National Clinical Research Center for Geriatric Disorder, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China.
2
Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA, 30322, USA.
3
GHM Institute of CNS Regeneration, Jinan University, Guangzhou, 510631, China.
4
Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA, 30322, USA. syang33@emory.edu.
5
Department of Neurology and National Clinical Research Center for Geriatric Disorder, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China. sli@emory.edu.
6
Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA, 30322, USA. sli@emory.edu.

Abstract

BACKGROUND:

Spinocerebellar ataxia 17 (SCA17) belongs to the family of neurodegenerative diseases caused by polyglutamine (polyQ) expansion. In SCA17, polyQ expansion occurs in the TATA box binding protein (TBP) and leads to the misfolding of TBP and the preferential degeneration in the cerebellar Purkinje neurons. Currently there is no effective treatment for SCA17. Mesencephalic astrocyte-derived neurotrophic factor (MANF) is a recently identified neurotrophic factor, and increasing MANF expression ameliorated SCA17 neuropathology in TBP-105Q knock-in (KI) mouse model, indicating that MANF could be a therapeutic target for treating SCA17.

METHODS:

In this study, we screened a collection of 2000 FDA-approved chemicals using a stable cell line expressing luciferase reporter, which is driven by MANF promoter. We identified several potential candidates that can induce the expression of MANF. Of these inducers, piperine is an agent that potently induces the luciferase expression or MANF expression.

RESULTS:

Addition of piperine in both cellular and mouse models of SCA17 alleviated toxicity caused by mutant TBP. Although mutant TBP is primarily localized in the nuclei, the polyQ expansion in TBP is able to induce ER stress, suggesting that nuclear misfolded proteins can also elicit ER stress as cytoplasmic misfolded proteins do. Moreover, piperine plays its protective role by reducing toxicity caused by the ER stress.

CONCLUSION:

Our study established piperine as a MANF-based therapeutic agent for ER stress-related neuropathology in SCA17.

KEYWORDS:

Ataxia; ER stress; Neurotrophic factor; Polyglutamine

PMID:
29378605
PMCID:
PMC5789626
DOI:
10.1186/s13024-018-0236-x
[Indexed for MEDLINE]
Free PMC Article

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