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01.03.2012 | Original Article | Ausgabe 3/2012

Langenbeck's Archives of Surgery 3/2012

Green tea protects human osteoblasts from cigarette smoke-induced injury: possible clinical implication

Zeitschrift:
Langenbeck's Archives of Surgery > Ausgabe 3/2012
Autoren:
Nina Holzer, Karl F. Braun, Sabrina Ehnert, José T. Egaña, Thilo L. Schenck, Arne Buchholz, Lilianna Schyschka, Markus Neumaier, Steffen Benzing, Ulrich Stöckle, Thomas Freude, Andreas K. Nussler
Wichtige Hinweise
Nina Holzer, Karl F. Braun, Sabrina Ehnert, Thomas Freude, and Andreas K. Nussler contributed equally to this work.

Abstract

Purpose

Recent reports discuss the altered bone homeostasis in cigarette smokers, being a risk factor for osteoporosis and negatively influencing fracture healing. Cigarette smoke is known to induce oxidative stress in the body via an increased production of reactive oxygen species (ROS). These increases in ROS are thought to damage the bone-forming osteoblasts. Naturally occurring polyphenols contained in green tea extract (GTE), e.g., catechins, are known to have anti-oxidative properties. Therefore, the aim of this study was to investigate whether GTE and especially catechins protect primary human osteoblasts from cigarette smoke-induced damage and to identify the underlying mechanisms.

Methods

Primary human osteoblasts were isolated from patients’ femur heads. Cigarette smoke medium (CSM) was obtained using a gas-washing bottle and standardized by its optical density (OD320) at λ = 320 nm. ROS formation was measured using 2′7′dichlorofluorescein diacetate, and osteoblasts’ viability was detected by resazurin conversion.

Results

Co-, pre-, and post-incubation with GTE and catechins significantly reduced ROS formation and thus improved the viability of CSM-treated osteoblasts. Besides GTE’s direct radical scavenging properties, pre-incubation with both GTE and catechins protected osteoblasts from CSM-induced damage. Inhibition of the anti-oxidative enzyme HO-1 significantly reduced the protective effect of GTE and catechins emphasizing the key role of this enzyme in GTE anti-oxidative effect.

Conclusions

Our data suggest possible beneficial effects on bone homeostasis, fracture healing, and bone mineral density following a GTE-rich diet or supplementation.

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