title: Bacopa monnieri-Induced Protective Autophagy Inhibits Benzo[a]pyrene-Mediated Apoptosis.
abstract: Benzo[a]pyrene (B[a]P) is capable of inducing oxidative stress and cellular injuries leading to cell death and associates with a significant risk of cancer development. Prevention of B[a]P-induced cellular toxicity with herbal compound through regulation of mitochondrial oxidative stress might protect cell death and have therapeutic benefit to human health. In this study, we demonstrated the cytoprotective role of Bacopa monnieri (BM) against B[a]P-induced apoptosis through autophagy induction. Pretreatment with BM rescued the reduction in cell viability in B[a]P-treated human keratinocytes (HaCaT) cells indicating the cytoprotective potential of BM against B[a]P. Moreover, BM was found to inhibit B[a]P-mediated reactive oxygen species (ROS)-induced apoptosis activation in HaCaT cells. Furthermore, BM was found to preserve mitochondrial membrane potential and inhibited release of cytochrome c in B[a]P-treated HaCaT cells. Bacopa monnieri induced protective autophagy; we knocked down Beclin-1, and data showed that BM was unable to protect from B[a]P-induced mitochondrial ROS-mediated apoptosis in Beclin-1-deficient HaCaT cells. Moreover, we established that B[a]P-induced damaged mitochondria were found to colocalize and degraded within autolysosomes in order to protect HaCaT cells from mitochondrial injury. In conclusion, B[a]P-induced apoptosis was rescued by BM treatment and provided cytoprotection through Beclin-1-dependent autophagy activation. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Durgesh Nandini
authors.initials: DN
authors.lastname: Das
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Prajna Paramita
authors.initials: PP
authors.lastname: Naik
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Aditi
authors.initials: A
authors.lastname: Nayak
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Prashanta Kumar
authors.initials: PK
authors.lastname: Panda
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Subhadip
authors.initials: S
authors.lastname: Mukhopadhyay
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India.
authors.forename: Niharika
authors.initials: N
authors.lastname: Sinha
authors.affiliation: Department of Life Science, National Institute of Technology, Rourkela, India. sbhutia@nitrkl.ac.in.
authors.forename: Sujit K
authors.initials: SK
authors.lastname: Bhutia
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D001343:Autophagy / Q000187:drug effects*; D034681:Bacopa / Q000737:chemistry*; D001564:Benzo(a)pyrene / Q000737:chemistry*; D006801:Humans; D018384:Oxidative Stress; D010936:Plant Extracts / Q000737:chemistry* / Q000494:pharmacology; D017382:Reactive Oxygen Species
chemical_list: D010936:Plant Extracts; D017382:Reactive Oxygen Species; D001564:Benzo(a)pyrene
keywords: Bacopa monnieri; Beclin-1; autophagy; benzo[a]pyrene; mitochondrial apoptosis; oxidative; stress