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Investigating the opposing effect of two different green tea supplements on oxidative stress, mitochondrial function and cell viability in HepG2 cells

journal contribution
posted on 2023-08-30, 18:15 authored by Aparna Shil, Christopher Davies, Lata Gautam, Justin D. Roberts, Havovi Chichger
Green tea extract (GTE) improves exercise outcomes and reduces obesity. However, case studies indicate contradictory physiology regarding liver function and toxicity. We studied the effect of two different decaffeinated GTE (dGTE) products, from a non-commercial (dGTE1) and commercial (dGTE2) supplier, on hepatocyte function using the human cell model, HepG2. dGTE1 was protective against hydrogen peroxide (H2O2)-induced apoptosis and cell death by attenuating oxidative stress pathways. Conversely, dGTE2 increased cellular and mitochondrial oxidative stress and apoptosis. A bioavailability study with dGTE showed the major catechin in GTE, EGCG, reached 0.263 µg·ml−1. In vitro, at this concentration, EGCG mimicked the protective effect of dGTE1. GC/MS analysis identified steric acid and higher levels of palmitic acid in dGTE2 versus dGTE1 supplements. We demonstrate the significant biological differences between two GTE supplements which may have potential implications for manufacturers and consumers to be aware of the biological effects of supplementation.

History

Refereed

  • Yes

Volume

0

Issue number

0

Page range

0

Publication title

Journal of Dietary Supplements

ISSN

1939-022X

Publisher

Taylor & Francis

File version

  • Accepted version

Language

  • eng

Legacy posted date

2021-03-01

Legacy creation date

2021-03-01

Legacy Faculty/School/Department

Faculty of Science & Engineering

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