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Mechanistic insight into anti-inflammatory potential, phytochemistry and ethnomedicinal status of Ilex species: a review

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Abstract

Inflammation assists in the healing process as a part of the natural defensive mechanism. Apart from the healing process, inflammatory mechanisms contribute to the progression and development of a range of ailments, including asthma, rheumatoid arthritis, cancer, neurodegenerative diseases, and so on. A new anti-inflammatory medication that is safe, potent, non-toxic, or less toxic is now required as the existing anti-inflammatory and non-steroidal drugs are associated with various side effects. In this context, we have reviewed the genus Ilex for traditional uses related to inflammation and anti-inflammatory properties (in vitro and in vivo) by utilizing databases like PubMed, Google Scholar, and Science Direct. According to ethnomedicinal information, these plants have been used to treat various inflammatory conditions. A total of 12 species were found with anti-inflammatory potential, where some studies were conducted using crude extracts and others with pure compounds. Many chemical compounds have been reported from the Ilex species; however, the bioactive composition explored for anti-inflammatory effects include rotundarpene, triterpenoid saponins, chlorogenic acid, ursolic acid, ilexgenin A, isoquercetin, kaempferol, ilexchinenosides J-Q and salicifoneoliganol. The mechanistic insights into how Ilex species deal with inflammatory stimuli in the mitogen-activated protein kinase, nuclear factor-κB, PI3K/Akt/mTOR, Janus kinase-signal transducer and activator of transcription, and arachidonic acid pathways have also been highlighted. The toxicity profile of studies has also been discussed to assess safety. These plants can be developed as drug-developing candidates after detailed follow-up studies.

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Abbreviations

3,5-DCQA:

3,5-Dicaffeoylquinic acid

5-LOX:

5-Lipoxygenase

AA:

Arachidonic acid

AP-1:

Activator protein 1

CAT:

Catalase

CLP:

Cecal ligation and puncture

COX-1:

Cyclooxygenase-1

COX-2:

Cyclooxygenase-2

CR:

Cytokine receptor

DEX:

Dexamethasone

ERK:

Extracellular signal-regulated kinase

Fmlf:

N-formyl-L-Met-L-Leu-L-Phe

GSH:

Glutathione

GSH-Px:

Glutathione peroxidase

GSSH:

Oxidized glutathione

HN:

Human neutrophils

iNOS:

Nitric oxide synthase

Iκκcomplex:

I kappa B kinase 1 and I kappa B kinase 2

JAK:

Janus kinase

LPS:

Lipopolysaccharides

MAPK:

Mitogen-activated protein kinase

MMP:

Matrix metalloproteinases

MMP-9:

Matrix metalloprotease-9

MPO:

Myeloperoxidase

mTOR:

Mammalian target of rapamycin

MyD88:

Myeloid differentiation primary response gene 88

NF-κB:

Nuclear factor kappa B

NO:

Nitric oxide

NSAIDs:

Non-steroidal anti-inflammatory drugs

P and T:

Prostaglandins and thromboxanes

p-Akt:

Phosphorylated akt

PAMPs:

Pathogen-associated molecule patterns

p-ERK ½:

Phosphorylated ERK-1/2

PGE2 :

Prostaglandin-2

PI3K:

Phosphatidylinositol-3-kinase

p-IκBα:

Phosphorylation of nuclear factor of kappa light polypeptide gene enhancer in B-cells inhibitor, alpha

p-JAK:

Phosphorylated janus kinase

PLA2:

Phospholipase A2

PRRs:

Pattern recognition receptors

p-SFKs:

Phosphorylated SRC family kinase

p-STAT:

Phosphorylated signal transducer and activator of transcription

ROS:

Reactive oxygen species

SAIDs:

Steroids

SHK:

Stimulated human keratinocytes

SOD:

Superoxide dismutase

STAT:

Signal transducer and activator of transcription

STCSEI:

Short-term cigarette smoke exposure induced

TBARS:

Thiobarbituric acid reactive substances

TRIF:

TIR-domain-containing adapter-inducing interferon-β

TLR:

Toll-like receptors

TNF-α:

Tumour necrosis factor-alpha

TRIF:

TIR-domain-containing adapter-inducing interferon-β

HPLC:

High-performance liquid chromatography

NMR:

Nuclear magnetic resonance

MDCK:

Madin-Darby canine kidney

OA:

Osteoarthritis

NLRP3:

Human NACHT, LRR, and PYD domain-containing protein 3

nCGA:

Neochlorogenic acid

MTT:

3-(4, 5-Dimethylthiazolyl-2)-2, 5-diphenyltetrazolium bromide

AMPK:

AMP-activated protein kinase

Nrf2:

Nuclear factor erythroid 2-related factor

IL-1β:

Interleukin-1β

IL-6:

Interleukin-6

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Acknowledgements

The authors (Acharya Balkrishna, Priyanka Rai, Rashmi Verma, Akansha Rohela, Ashwani Kumar, and Vedpriya Arya) are grateful to Revered Swami Ramdev, Patanjali Yogpeeth, Haridwar for providing all the necessary facilities. Further, the authors thank the Ministry of AYUSH under Grant-in-Aid for establishing the Centre of Excellence of Renovation and Upgradation of Patanjali Ayurveda Hospital, Haridwar, India.

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Correspondence to Ashwani Kumar or Ryszard Amarowicz.

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Balkrishna, A., Rai, P., Verma, R. et al. Mechanistic insight into anti-inflammatory potential, phytochemistry and ethnomedicinal status of Ilex species: a review. Phytochem Rev (2024). https://doi.org/10.1007/s11101-024-09968-2

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