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Open Access Research article

Bee venom effects on ubiquitin proteasome system in hSOD1G85R-expressing NSC34 motor neuron cells

Seon Hwy Kim1, So Young Jung1, Kang-Woo Lee1, Sun Hwa Lee1, MuDan Cai1, Sun-Mi Choi2 and Eun Jin Yang1*

Author Affiliations

1 Department of Acupuncture & Moxibustion, Korea Institute of Oriental Medicine, 483 Expo-ro, Daejeon, Yuseong-gu 305-811, Republic of Korea

2 Department of Medical Research, Korea Institute of Oriental Medicine, 483 Expo-ro, Daejeon, Yuseong-gu 305-811, Republic of Korea

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BMC Complementary and Alternative Medicine 2013, 13:179  doi:10.1186/1472-6882-13-179

Published: 18 July 2013

Abstract

Background

Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that results from a progressive loss of motor neurons. Familial ALS (fALS) is caused by missense mutations in Cu, Zn-superoxide dismutase 1 (SOD1) that frequently result in the accumulation of mutant protein aggregates that are associated with impairments in the ubiquitin-proteasome system (UPS). UPS impairment has been implicated in many neurological disorders. Bee venom (BV) extracted from honey bees has been used as a traditional medicine for treating inflammatory diseases and has been shown to attenuate the neuroinflammatory events that occur in a symptomatic ALS animal model.

Methods

NSC34 cells were transiently transfected with a WT or G85R hSOD1-GFP construct for 24 hrs and then stimulated with 2.5 μg/ml BV for 24 hrs. To determine whether a SOD1 mutation affects UPS function in NSC34 cells, we examined proteasome activity and performed western blotting and immunofluorescence using specific antibodies, such as anti-misfolded SOD1, anti-ubiquitin, anti-GRP78, anti-LC3, and anti-ISG15 antibodies.

Results

We found that GFP-hSOD1G85R overexpression induced SOD1 inclusions and reduced proteasome activity compared with the overexpression of GFP alone in NSC34 motor neuronal cells. In addition, we also observed that BV treatment restored proteasome activity and reduced the accumulation of ubiquitinated and misfolded SOD1 in GFP-hSOD1G85R-overexpressing NSC34 motor neuronal cells. However, BV treatment did not activate the autophagic pathway in these cells.

Conclusion

Our findings suggest that BV may rescue the impairment of the UPS in ALS models.

Keywords:
hSOD1G85R; Ubiquitin proteasome system (UPS); Bee venom (BV); Amyotrophic lateral sclerosis (ALS); NSC34 motor neuronal cells