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Ramyadevi R, Poornima V. Utilisation of audible steganography to organise and analyse the text within WAV files. IJIEI 2022. [DOI: 10.1504/ijiei.2022.129098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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Poornima V, Ramyadevi R. Utilization of Audible Steganography to Organise And Analyse the Text Within WAV Files. IJIEI 2022. [DOI: 10.1504/ijiei.2022.10053658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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Padmalaya G, Sreeja BS, Dinesh Kumar P, Radha S, Poornima V, Arivanandan M, Shrestha S, Uma TS. A Facile Synthesis of Cellulose Acetate Functionalized Zinc Oxide Nanocomposite for Electrochemical Sensing of Cadmium ions. J Inorg Organomet Polym Mater 2018. [DOI: 10.1007/s10904-018-0989-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Saravanan R, Gracia F, Khan MM, Poornima V, Gupta VK, Narayanan V, Stephen A. ZnO/CdO nanocomposites for textile effluent degradation and electrochemical detection. J Mol Liq 2015. [DOI: 10.1016/j.molliq.2015.05.040] [Citation(s) in RCA: 126] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Poornima V, Vallabhaneni S, Mukhopadhyay M, Bera AK. Nitric oxide inhibits the pannexin 1 channel through a cGMP-PKG dependent pathway. Nitric Oxide 2015; 47:77-84. [PMID: 25917852 DOI: 10.1016/j.niox.2015.04.005] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 04/15/2015] [Accepted: 04/17/2015] [Indexed: 11/16/2022]
Abstract
Nitric oxide (NO), a major gaseous signaling molecule, modulates several ion channels and receptors. Here we show that NO attenuates pannexin 1 (Panx1) mediated currents in HEK-293 cells. NO exerts its effect by activating a cGMP-protein kinase G (PKG) dependent pathway. NO donors, sodium nitroprusside (SNP), S-nitroso-N-acetylpenicillamine (SNAP) and S-nitrosoglutathione (GSNO), reduced Panx1 currents by 25-41%. 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), an inhibitor of soluble guanylyl cyclase (sGC), blocked the inhibition completely, whereas sGC activator YC-1 mimicked the effect of NO, suggesting the involvement of a cGMP dependent pathway. Supporting this, NO had no effect in the presence of the PKG inhibitor, KT5823. Further, immuno-precipitated Panx1 was recognized by an anti-phosphoserine antibody in Western blot. Phosphorylation was enhanced significantly when cells were treated with SNP. The target for phosphorylation is possibly Ser 206 of Panx1, as its mutation to Ala completely abolished the NO mediated inhibition.
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Affiliation(s)
- V Poornima
- Department of Biotechnology, Bhupat & Jyoti Mehta School of BioSciences, Indian Institute of Technology Madras, Sardar Patel Road, Chennai, Tamil Nadu 600036, India
| | - Sirisha Vallabhaneni
- Department of Biotechnology, Bhupat & Jyoti Mehta School of BioSciences, Indian Institute of Technology Madras, Sardar Patel Road, Chennai, Tamil Nadu 600036, India
| | - Mohona Mukhopadhyay
- Department of Biotechnology, Bhupat & Jyoti Mehta School of BioSciences, Indian Institute of Technology Madras, Sardar Patel Road, Chennai, Tamil Nadu 600036, India
| | - Amal Kanti Bera
- Department of Biotechnology, Bhupat & Jyoti Mehta School of BioSciences, Indian Institute of Technology Madras, Sardar Patel Road, Chennai, Tamil Nadu 600036, India.
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Affiliation(s)
- Sangeeta R Patankar
- Department of Oral Pathology, Yerala Medical Trust's Dental College, Navi Mumbai, Maharashtra, India
| | - V Poornima
- Department of Oral Pathology, Yerala Medical Trust's Dental College, Navi Mumbai, Maharashtra, India
| | - Vineet Avdhani
- Department of Oral and Maxillofacial Surgery, Terna Dental College, Navi Mumbai, Maharashtra, India
| | - Sanya Bhatia
- Department of Oral Pathology, Yerala Medical Trust's Dental College, Navi Mumbai, Maharashtra, India
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Sakthivel R, Poornima V, Jayanthi M, Reddy VN, Selvaraju G, Sakthivel M. Evaluation of Anxiety and the Effect of Modeling in Children undergoing Orthopantomographic Examination. J Indian Acad Oral Med Radiol 2013. [DOI: 10.4103/0972-1363.161045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2023] Open
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Korde Choudhari S, Sridharan G, Gadbail A, Poornima V. Nitric oxide and oral cancer: a review. Oral Oncol 2012; 48:475-83. [PMID: 22356896 DOI: 10.1016/j.oraloncology.2012.01.003] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Revised: 12/27/2011] [Accepted: 01/05/2012] [Indexed: 02/05/2023]
Abstract
Nitric oxide (NO), a short-lived, endogenously produced gas, plays key role in various physiological as well as pathological processes. NO-inducing cell signaling events within the cell producing it and the diffusibility of it in other cells have led to the discovery of various physiological functions of NO including vasodilation, respiration, cell migration, immune response and apoptosis. On the other hand, excessive and unregulated NO synthesis has been implicated in many pathophysiological conditions including cancer. Research on NO, during the past few years is one of the growing areas in cancer biology. The high incidence of oral cancer and precancer has been linked with habits of tobacco chewing and smoking and NO has been said as the "messenger of death" in tobacco related diseases. NO seems to play a part in various stages of carcinogenesis from initiation to progression. However, there is considerable controversy and confusion in understanding its role in cancer biology. It is said to have both, tumoricidal as well as tumor promoting effects and these depend on its timing, location and concentration. Further, NO has also been shown to have antitumor, chemopreventive and therapeutic abilities. Here is an overview in which efforts are made to understand the role of this molecule in oral carcinogenesis.
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Affiliation(s)
- Sheetal Korde Choudhari
- Dept. of Oral & Maxillofacial Pathology & Microbiology, Yerala Dental College, Navi Mumbai, Maharashtra, India.
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Affiliation(s)
- V Poornima
- Department of Oral Pathology and Microbiology, Dr. G D Pol Foundation YMT Dental College and Hospital, Navi Mumbai, India
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Poornima V, Madhupriya M, Kootar S, Sujatha G, Kumar A, Bera AK. P2X7 receptor-pannexin 1 hemichannel association: effect of extracellular calcium on membrane permeabilization. J Mol Neurosci 2011; 46:585-94. [PMID: 21932038 DOI: 10.1007/s12031-011-9646-8] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Accepted: 08/30/2011] [Indexed: 10/17/2022]
Abstract
Activation of P2X(7) receptor (P2X(7)R) and pannexin have been implicated in membrane permeabilization associated with ischemic cell death and many other inflammatory processes. P2X(7)R has a unique property of forming large pore upon repeated or prolonged application of agonist like ATP or 2', 3'-(4-benzoyl) benzoyl ATP. It has been proposed that pannexin 1 (panx1) hemichannel associates with P2X(7)R to form large pore, though the actual mechanism is not yet understood. Calcium concentration in extracellular milieu drops in many patho-physiological conditions, e.g. ischemia, when P2X(7)R/pannexin is also known to be activated. Therefore, we hypothesize that extracellular calcium ([Ca(2+)](o)) plays an important role in the coupling of P2X(7)R-panx1 and subsequent membrane permeabilization. In this study we show that membrane permeability of the P2X(7)R and panx1 expressing N2A cell increases in ([Ca(2+)](o))-free solution. In [Ca(2+)](o)-free solution, fluorescent dye calcein trapped cells exhibited time-dependent dye leakage resulting in about 50% decrease of fluorescence intensity in 30 min. Control cells in 2 mM [Ca(2+)](o) did not show such leakage. Like N2A cells, mixed culture of neuron and glia, derived from hippocampal progenitor cells showed similar dye leakage. Dye leakage was blocked either by pannexin-specific blocker, carbenoxolone or P2X(7)R antagonists, Brilliant Blue G, and oxidized ATP. Furthermore P2X(7)R and panx1 were co-immunoprecipitated. The amount of P2X(7)R protein pulled-down with panx1, increased by twofold when cells were incubated 30 min in [Ca(2+)](o)-free buffer. Taken together, the results of this study demonstrate the activation and association of P2X(7)R-panx1, triggered by the removal of [Ca(2+)](o).
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Affiliation(s)
- V Poornima
- Department of Biotechnology, IIT Madras, Chennai, 600036, India
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Shah A, Luthra P, Mahale AR, Kumar A, Venugopal A, Poornima V. Aneurysmal bone cyst of sacrum - a case report. Indian J Radiol Imaging 2006. [DOI: 10.4103/0971-3026.29037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- A Shah
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
| | - P Luthra
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
| | - AR Mahale
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
| | - A Kumar
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
| | - A Venugopal
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
| | - V Poornima
- Department of Radio diagnosis and Imaging, Kasturba Medical College, Mangalore - 575001, India
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