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Rebamipide Mitigates Impairments in Mitochondrial Function and Bioenergetics with α-Synuclein Pathology in 6-OHDA-Induced Hemiparkinson’s Model in Rats

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Abstract

Parkinson’s disease (PD) is one of the widely reported neurodegenerative disorders affecting more than ten million people worldwide. Due to therapeutic limitations and several adverse effects associated with currently used drugs, it is crucial to search for safe and effective options for treatment of PD. Oxidative stress, mitochondrial dysfunction, α-synuclein oligomeric aggregates, and glucocerebrosidase (GCase) deficiency are involved in PD pathogenesis. Rebamipide, an anti-ulcer drug, is a proven free-radical scavenger and antioxidant. The drug has shown neuroprotective effects in cultured SH-SY5Y cells. Therefore, we investigated the pharmacological effect of rebamipide in 6-hydroxydopamine (6-OHDA)-induced experimental PD model. Rebamipide was given to adult male albino rats of Charles-Foster strain in 20, 40, and 80 mg/kg (R-20, R-40, and R-80) oral dose twice daily for 24 days (day 4 to day 27) after 6-OHDA intrastriatal injection. The drug inhibited 6-OHDA-induced motor deficits and nigral α-synuclein aggregates in dose-dependent manner. R-40 and R-80 dose dependently increased striatal mitochondrial complex I, II, IV, and V activities; mitochondrial bioenergetics; and nigral GCase activity. 6-OHDA-induced lipid peroxidation was decreased. Highest dose (R-80) also decreased apoptotic proteins and upregulated striatal dopamine concentration in 6-OHDA-induced hemiparkinson’s rat model. Therefore, the anti-PD effect of rebamipide may involve stabilization of mitochondrial bioenergetics, enhancement of GCase enzymatic activity as well as decreased oxidative stress with α-synuclein pathology, and apoptosis in 6-OHDA-induced hemiparkinson’s rat model. Hence, preclinical evidence indicates rebamipide to be a potential drug for management of PD.

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Abbreviations

4-MU:

4-methylumbelliferone

6-OHDA:

6-hydroxydopamine

α-Synuclein:

alpha-synuclein

Aβ42:

amyloid-β 1–42

ADP:

adenosine diphosphate

ATP:

adenosine triphosphate

β-actin:

beta-actin

BSA:

bovine serum albumin

CMC:

carboxymethylcellulose

CNS:

central nervous system

COMT:

catechol-O-methyltransferase

DA:

dopamine

DNA:

deoxyribonucleic acid

DOPAC:

3,4-dihydroxyphenylacetic acid

ECD:

electrochemical detector

EGTA:

ethylene glycol-bis (β-aminoethyl ether)-N,N,N′,N′-tetraacetic acid

ELISA:

enzyme-linked immunosorbent assay

ER:

endoplasmic reticulum

ETC:

electron transport chain

FAD:

flavin adenine dinucleotide

FCCP:

carbonyl cyanide 4-(trifluoromethoxy) phenylhydrazone

GC:

glucocerebroside

GCase:

glucocerebrosidase

h:

hours

H+ :

Hydrogen ion

H2O2 :

hydrogen peroxide

HEPES:

4-(2-hydroxyethyl)-1-piperazine ethanesulfonic acid

HPLC:

high-performance liquid chromatography

HVA:

homovanillic acid

iNOS:

inducible nitric oxide synthase

kg:

kilogram

KH2PO4 :

potassium phosphate monobasic anhydrous

LPO:

lipid peroxide

MAO B:

monoamine oxidase B

MDA:

malondialdehyde

mg:

milligram

MgCl2 :

magnesium chloride

Min:

minute

mL:

milliliter

mM:

millimolar

mmol:

millimoles

MMP:

mitochondrial membrane potential

μL:

microliter

μg:

microgram

μmol:

micromoles

NAD+ :

nicotinamide adenine dinucleotide (oxidized)

NADH:

nicotinamide adenine dinucleotide (reduced)

NBT:

nitroblue tetrazolium

ng:

nanogram

NIH:

National Institutes of Health Guide for the Care and Use of Laboratory Animals

NMDA:

N-methyl-d-aspartate

nmol:

nanomoles

OFT:

open field test

PD:

Parkinson’s disease

pg:

picogram

Pi:

inorganic phosphate

p.o.:

per os

R-20:

rebamipide 20 mg/kg

R-40:

rebamipide 40 mg/kg

R-80:

rebamipide 80 mg/kg

RCR:

respiratory control ratio

RNA:

ribonucleic acid

ROS:

reactive oxygen species

S.C.:

subcutaneous

SD:

standard deviation

SDS-PAGE:

sodium dodecyl sulfate polyacrylamide gel electrophoresis

S:

seconds

SOD:

superoxide dismutase

SNc:

substantia nigra pars compacta

TBARS:

thiobarbituric acid reactive substances

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Acknowledgements

The authors wish to acknowledge Akums Drugs & Pharmaceuticals Ltd., New Delhi, India for providing rebamipide (active pharmaceutical ingredient) as gift sample. This work was supported by the teaching assistantship to Akanksha Mishra from Indian Institute of Technology (Banaras Hindu University), Varanasi-221005, U.P., India.

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Correspondence to Sairam Krishnamurthy.

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The authors declare that they have no conflict of interest.

Ethical Approval

All the procedures performed in the study were in accordance with the ethical standards of the Institutional animal ethical committee, Banaras Hindu University (Dean/2016/CAEC/33). The experiments were performed according to the principles of National Institutes of Health Guide for the Care and Use of Laboratory Animals (NIH Publications No. 8023, revised 1978) guidelines. The article does not contain any studies with human participants performed by any of the authors.

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Mishra, A., Krishnamurthy, S. Rebamipide Mitigates Impairments in Mitochondrial Function and Bioenergetics with α-Synuclein Pathology in 6-OHDA-Induced Hemiparkinson’s Model in Rats. Neurotox Res 35, 542–562 (2019). https://doi.org/10.1007/s12640-018-9983-2

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  • DOI: https://doi.org/10.1007/s12640-018-9983-2

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