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Taxoids-rich extract from Taxus wallichiana alleviates high-fat diet-induced insulin resistance in C57BL/6 mice through inhibition of low-grade inflammation

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Abstract

The needle powder of Taxus wallichiana is in use for the management of diabetes and inflammation-related complications in the Indian and Chinese Systems of Traditional Medicine but the lack of proper pharmacological intervention has prompted us to investigate the pharmacological mechanism against inflammation-induced insulin resistance in high-fat diet-fed C57BL/6 mice. Hexane (Tw-H), chloroform (Tw-C), and ethyl acetate (Tw-EA) extracts were prepared from a needle of T. wallichiana and its effect on glucose uptake against TNF-α-induced insulin resistance in skeletal muscle cells was studied. Among all, Tw-EA extract has shown promising glucose uptake potential. Tw-EA treatment is also able to decrease the lipid accumulation in adipocytes. Chemical signature of Tw-EA using HPLC showed the presence of taxoids. Efficacy of taxoids-rich extract from T. wallichiana (Tw-EA) was further validated in in vivo system against high-fat diet (HFD)-induced insulin resistance in C57BL/6 mice. Oral treatment of Tw-EA showed significant reduction in blood glucose, pro-inflammatory cytokine production and body weight gain when compared with vehicle-treated HFD-induced insulin resistance in C57BL/6 mice. Histopathology and immunohistochemistry study in skeletal muscle and adipose tissue revealed that oral treatment of Tw-EA is able to reduce the infiltration of inflammatory cells in skeletal muscles, ameliorate the hypertrophy in adipose tissue and upregulate the GLUT4 protein expression. Treatment with Tw-EA significantly up-regulated mRNA expression of insulin signaling pathway (IRS-1, PI3K, AKT, GLUT 4). This study suggested the beneficial effect of taxoids-rich extract from Taxus wallichiana against the inflammation-associated insulin resistance condition.

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Abbreviations

IR:

Insulin resistance

T2D:

Type 2 diabetes mellitus

PI3K:

Phosphatidylinositol-3-kinase

HFD:

High-fat diet

FBG:

Fasting blood glucose

DMSO:

Dimethyl sulfoxide

Akt:

Protein kinase B

GOD–POD:

Glucoxidase–peroxidase

ITT:

Insulin tolerance test

GLUT 4:

Glucose transporter

Met:

Metformin

IRS:

Insulin receptor substrate

TwN :

Taxus wallichiana needles

OGTT:

Oral glucose tolerance test

10-DAB:

10-Deacetylbaccatin

BRE:

Brevifoliol

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Acknowledgements

The authors are grateful to the Indian Council of Medical Research (ICMR), New Delhi under project GAP-234 for providing fellowship to first author and Director, CSIR-CIMAP, Lucknow, India for providing essential research facilities and support.

Funding

The study was financially supported by the Council of Scientific and Industrial Research (CSIR), New Delhi under project HCP-0007.

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Correspondence to Dnyaneshwar U. Bawankule.

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Binwal, M., Babu, V., Israr, K.M. et al. Taxoids-rich extract from Taxus wallichiana alleviates high-fat diet-induced insulin resistance in C57BL/6 mice through inhibition of low-grade inflammation. Inflammopharmacol 31, 451–464 (2023). https://doi.org/10.1007/s10787-022-01119-3

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  • DOI: https://doi.org/10.1007/s10787-022-01119-3

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