title: Phenazine-1-carboxamide (PCN) from Pseudomonas sp. strain PUP6 selectively induced apoptosis in lung (A549) and breast (MDA MB-231) cancer cells by inhibition of antiapoptotic Bcl-2 family proteins.
abstract: Phenazine-1-carboxamide (PCN), a naturally occurring simple phenazine derivative isolated from Pseudomonas sp. strain PUP6, exhibited selective cytotoxic activity against lung (A549) and breast (MDA-MB-231) cancer cell lines in differential and dose-dependent manner compared to normal peripheral blood mononuclear cells. PCN-treated cancer cells showed the induction of apoptosis as evidenced by the release of low level of LDH, morphological characteristics, production of reactive oxygen species, loss of mitochondrial membrane potential (ΔΨm) and induction of caspase-3. At molecular level, PCN instigates apoptosis by mitochondrial intrinsic apoptotic pathway via the overexpression of p53, Bax, cytochrome C release and activation of caspase-3 with the inhibition of oncogenic anti-apoptotic proteins such as PARP and Bcl-2 family proteins (Bcl-2, Bcl-w and Bcl-xL). The in silico docking studies of PCN targeted against the anti-apoptotic members of Bcl-2 family proteins revealed the interaction of PCN with the BH3 domain, which might lead to the induction of apoptosis due to the inhibition of antiapoptotic proteins. Due to its innate inhibition potential of antiapoptotic Bcl-2 family proteins, PCN may be used as potent anticancer agent against both lung and breast cancer.
authors.affiliation: Department of Biotechnology, School of Life Sciences, Pondicherry University, Kalapet, Puducherry, 605014, India.
authors.forename: R Kamaraj
authors.initials: RK
authors.lastname: Kennedy
authors.forename: V
authors.initials: V
authors.lastname: Veena
authors.forename: P Ravindra
authors.initials: PR
authors.lastname: Naik
authors.forename: Pragna
authors.initials: P
authors.lastname: Lakshmi
authors.forename: R
authors.initials: R
authors.lastname: Krishna
authors.forename: S
authors.initials: S
authors.lastname: Sudharani
authors.forename: N
authors.initials: N
authors.lastname: Sakthivel
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D017209:Apoptosis / Q000187:drug effects*; D051017:Apoptosis Regulatory Proteins / Q000378:metabolism; D001943:Breast Neoplasms / Q000378:metabolism*; D045744:Cell Line, Tumor; D006801:Humans; D008175:Lung Neoplasms / Q000378:metabolism*; D053078:Membrane Potential, Mitochondrial / Q000187:drug effects; D062105:Molecular Docking Simulation; D010619:Phenazines / Q000494:pharmacology*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism*; D011549:Pseudomonas / Q000737:chemistry; D017382:Reactive Oxygen Species / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D051017:Apoptosis Regulatory Proteins; C481505:BCL2L15 protein, human; D010619:Phenazines; D019253:Proto-Oncogene Proteins c-bcl-2; D017382:Reactive Oxygen Species; C420923:phenazine-1-carboxamide