Abstract
Aim:
The adverse effects of local anesthetics (LAs) on wound healing at surgical sites have been suggested, and may be related to their cytotoxicity. This study was aimed to compare the cellular toxicity of bupivacaine and lidocaine (two well-known LAs), and to explore the molecular mechanism(s).
Methods:
Toxicity of bupivacaine and lidocaine was assessed in cultured mouse C2C12 myoblasts by cell viability and apoptosis assays. Effects of LAs on extracellular signal-regulated kinase (ERK) and protein kinase B (Akt) activation, which are essential for cell proliferation and survival, were evaluated by immunoblotting.
Results:
Both LAs, especially bupivacaine, prevented cell growth and caused cell death in a dose-dependent manner. The half maximal inhibitory concentrations (IC50) for bupivacaine and lidocaine were 0.49±0.04 and 3.37±0.53 mmol/L, respectively. When applied at the same dilutions of commercially available preparations, the apoptotic effect induced by bupivacaine was more severe than that of lidocaine in C2C12 cells. Furthermore, bupivacaine significantly diminished the ERK activation, which may underlie its anti-proliferative actions. Both LAs suppressed Akt activation, which correlated with their effects on apoptosis.
Conclusion:
Our study demonstrated that, when used at the same dilutions from clinically relevant concentrations, bupivacaine is more cytotoxic than lidocaine in vitro. Anti-proliferation and cell death with concomitant apoptosis mediated by bupivacaine may offer an explanation for its adverse effects in vivo (eg slowing wound healing at the surgical sites). A less toxic, long-acting anesthetic may be needed.
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Acknowledgements
This work was supported by a St Joseph's Foundation Startup Fund (to Dr Yao HUANG). Dr Joseph M MAURICE was a recipient of an American Association of Gynecologic Laparoscopy Fellowship.
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Parts of this work were presented at the 37th and 38th Global Congresses of Minimally Invasive Gynecology in Las Vegas, Nevada, USA, 2008, and in Orlando, Florida, USA, 2009.
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Maurice, J., Gan, Y., MA, Fx. et al. Bupivacaine causes cytotoxicity in mouse C2C12 myoblast cells: involvement of ERK and Akt signaling pathways. Acta Pharmacol Sin 31, 493–500 (2010). https://doi.org/10.1038/aps.2010.20
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DOI: https://doi.org/10.1038/aps.2010.20
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