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Anti-inflammatory effect of stevioside abates Freund’s complete adjuvant (FCA)-induced adjuvant arthritis in rats

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Abstract

Adjuvant arthritis is a chronic, autoimmune and inflammatory disorder of the joints. The occurrence of disorder causes a severe damage to the connective tissue eventually leading to progressive physical disability and eventual death. The recent years of evidence suggests the anti-inflammatory properties of stevioside, a diterpene glycoside. However, the effect of stevioside against adjuvant arthritis, a chronic inflammatory disorder is not known. Hence, the present study was designed to study the effect of stevioside against Freund's complete adjuvant induced arthritis model in rats. The acute anti-inflammatory effect of stevioside also studied by employing carrageenan-induced paw oedema model in rats. The biochemical markers, haematological parameters, lipid peroxidation, myeloperoxidase activity, lipoxygenase activity, the levels of PGE2 and pro-inflammatory (TNF-α, IL-6 & IL-1β) and anti-inflammatory cytokine (IL-10) were analysed. The protein expression of NF-κB (p65) COX-2 and iNOS in paw tissues were estimated by western blotting. Stevioside treatment significantly ameliorates the adjuvant induced arthritic scoring, histological alterations, paw volume, elevation of biochemical (AST, ALT, ALP and glucose levels) and haematological (haemoglobin, differential and platelet count) parameters and restored the endogenous anti-oxidant (SOD, CAT, GSH and GST) activities. Treatment with stevioside also significantly prevented the adjuvant induced elevation of pro-inflammatory cytokines (TNF-α, IL-6 and IL-1β), pro-inflammatory protein expressions (iNOS, COX-2, NF-κB (p65) and pIκB/IκB ratio), prevented the increase in myeloperoxidase activity and significantly restored the anti-inflammatory (IL-10) cytokine level in paw tissues. Collectively, our findings suggest that stevioside may serve as anti-inflammatory agent and could serve as a potential adjunct therapeutic option in treating adjuvant arthritis.

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Abbreviations

ANOVA:

Analysis of variance

BCA:

Bicinchoninic acid

FCA:

Freund’s complete adjuvant

RIPA:

Radioimmunoprecipitation assay

PVDF:

Polyvinylidine difluoride

BSA:

Bovine serum albumin

TBA:

2-Thiobarbituric acid

H&E:

Hematoxylin and eosin staining

DTNB:

5,5′-Dithio-bis-(2-nitrobenzoic acid)

CDNB:

1-Chloro-2,4-dinitrobenzene

COX-2:

Cyclooxygenase-2

TNF-α:

Tumour necrosis factor-α

IL-6:

Interleukin-6

IL-1β:

Interleukin-1β

IL-10:

Interleukin-10

NF-κB:

Nuclear factor kappa B

IκB:

Inhibitor of kappa B

iNOS:

Inducible nitric oxide synthase

MDA:

Malondialdehyde

TBARS:

Thiobarbituric acid reactive substances

ROS:

Reactive oxygen species

SEM:

Standard error of mean

CAT:

Catalase

SOD:

Superoxide dismutase

HRP:

Horseradish peroxidise

ELISA:

Enzyme-linked immunosorbent assay

p.o:

Per oral

PBS:

Phosphate buffered saline

HTAB:

Hexadecyltrimethylammonium bromide

AST:

Aspartate aminotransferase

ALT:

Alanine aminotransferase

ALP:

Alkaline phosphatase

GST:

Glutathione S-transferase

PGE2:

Prostaglandin E2

SDS-PAGE:

Sodium dodecyl sulfate–polyacrylamide gel electrophoresis

EDTA:

Ethylenediaminetetraacetic acid

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Acknowledgements

SA acknowledges the Department of Science and Technology (DST), New Delhi, India, for financial assistance in the form of Inspire Fellowship (IF160504). NN and SR thank the Indian Council of Medical Research (ICMR), New Delhi, India and the Council of Scientific and Industrial Research (CSIR) (Grant No. 31/014(2683)/2016-EMR-I), New Delhi, India, respectively, for the award of Senior Research Fellowships (SRF). We thank Director CSIR-IICT for the support (IICT/Pubs./2019/413).

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Correspondence to Ramakrishna Sistla.

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Alavala, S., Nalban, N., Sangaraju, R. et al. Anti-inflammatory effect of stevioside abates Freund’s complete adjuvant (FCA)-induced adjuvant arthritis in rats. Inflammopharmacol 28, 1579–1597 (2020). https://doi.org/10.1007/s10787-020-00736-0

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  • DOI: https://doi.org/10.1007/s10787-020-00736-0

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