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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Cytoprotective effect exerted by geraniin in HepG2 cells is through microRNA mediated regulation of BACH-1 and HO-1

  • Aayadi, Hoda (Department of Zoology, Savitribai Phule Pune University) ;
  • Mittal, Smriti P.K. (Department of Zoology, Savitribai Phule Pune University) ;
  • Deshpande, Anjali (AJ Organica Pvt. Ltd.) ;
  • Gore, Makarand (AJ Organica Pvt. Ltd.) ;
  • Ghaskadbi, Saroj S. (Department of Zoology, Savitribai Phule Pune University)
  • Received : 2017.04.10
  • Accepted : 2017.06.07
  • Published : 2017.11.30
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Abstract

Geraniin, a hydrolysable tannin, used in traditional medicine in Southeast Asia, is known to exhibit various biological activities. As an antioxidant it is known to up-regulate phase II enzyme Heme oxygenase-1 (HO-1). However its mechanism is not clearly understood. Nuclear factor erythroid-derived 2 related factor 2 (Nrf-2) is transcriptionally up-regulated by Extracellular signal-regulated kinase (ERK) 1/2 and retained in nucleus due to inactivated Glycogen synthase kinase 3 beta ($GSK-3{\beta}$). Geraniin additionally down-regulates expression of microRNA 217 and 377 (miR-217 and miR-377) which target HO-1 mRNA. Expression of BTB and CNC homolog 1 (BACH-1), another regulator of HO-1, is also down-regulated by up-regulating microRNA 98 (miR-98), a negative regulator of BACH-1. Thus, geraniin up-regulates HO-1 expression both through activating its positive regulator Nrf-2 and by down-regulating its negative regulator BACH-1. Up-regulation of HO-1 also confers protection to HepG2 cells from tertiary butyl hydroperoxide (TBH) induced cytotoxicity.

Keywords

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