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Weyrich LS, Nath S, Jamieson LM. Commercializing equitable, accessible oral microbiome transplantation therapy. Community Dent Health 2024; 41:83-88. [PMID: 38377047 DOI: 10.1922/cdh_iadr24weyrich06] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 01/10/2024] [Indexed: 02/22/2024]
Abstract
Chronic oral diseases, such as caries and periodontal disease, may, in future, be treated by oral microbiome transplant (OMT) technology. OMT therapy would involve collecting a donor oral microbiome and transplanting into a recipient to either prevent or treat oral diseases linked to a change (i.e., dysbiosis) in the oral microbiome. Given the great promise of this technology, we must consider the ethical and practical implications of how it is developed to maximise its accessibility and affordability. Here, we examine ways that OMT technology might be commercialized in the context of equity and accessibility in both clinical or do-it-yourself settings. We do this while assuming that the technology can be developed for humans in ways that are safe and effective at the individual and population-levels. We highlight the need for OMT therapy to be 1) cost-effective, 2) understood by end users and clinicians, 3) easy to access even in rural or remote communities, and 4) providing donors equitable compensation for their microbiomes. These key elements will only be achieved through partnerships between scientists, clinicians, investors and stakeholders throughout development. Therefore, proper acknowledgement and equitable evaluation of contributions in this team will also be critical to ensuring that this technology can be globally accessed. While OMT is likely to reshape how we prevent or treat oral disease, consciously guiding its development toward equity and accessibility to all people may significantly aid in improving health for those without access to dental care.
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Affiliation(s)
- L S Weyrich
- Department of Anthropology, Pennsylvania State University
- School of Biological Sciences, University of Adelaide
- Huck Institutes of Life Sciences, Pennsylvania State University
| | - S Nath
- Australian Research Centre for Population Oral Health, University of Adelaide
| | - L M Jamieson
- Australian Research Centre for Population Oral Health, University of Adelaide
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Nath S, Weyrich L, Zilm P, Kapellas K, Jamieson LM. Oral microbiome research from a public health perspective and implications for oral health. Community Dent Health 2024; 41:75-82. [PMID: 38377042 DOI: 10.1922/cdh_iadr24nath08] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 12/05/2023] [Accepted: 01/10/2024] [Indexed: 02/22/2024]
Abstract
Advancing oral microbiome research has revealed the association between oral microbiome composition and oral disease. However, much of the research has predominantly focused on comparing health and disease conditions, overlooking the potential dental public health implications. This article examines the evolution of oral microbial research from inception, advancement, and current knowledge of health-associated microbiota. Specifically, we focus on two key aspects: the impact of lifestyle and environmental factors on the oral microbiome and using the oral microbes as a therapeutic modality. The complex interaction of host intrinsic, environmental, and lifestyle factors affects the occurrence and development of the oral microbiota. The article highlights the need for ongoing research that embraces population diversity to promote health equity in oral health research and integrate public health practices into microbiome-based research. The implication of population-level interventions and targeted approaches harnessing the oral microbiome as an intervention, such as oral microbiome transplantation, should be further explored.
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Affiliation(s)
- S Nath
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
| | - L Weyrich
- School of Biological Sciences, University of Adelaide, Adelaide, SA, Australia; Department of Anthropology, The Pennsylvania State University, University Park, PA, 16802, USA
| | - P Zilm
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
| | - K Kapellas
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
| | - L M Jamieson
- Adelaide Dental School, The University of Adelaide, Adelaide, SA, Australia
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Ranjan R, Nath S, Jha S, Narasimha VL. Single parent adoption in India: Mental health and legal perspectives and the way forward. J Postgrad Med 2023; 69:215-220. [PMID: 37357486 PMCID: PMC10846805 DOI: 10.4103/jpgm.jpgm_718_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 01/08/2023] [Accepted: 02/01/2023] [Indexed: 06/27/2023] Open
Abstract
Single parent adoption (SPA) is a relatively new construct worldwide and in India. The Ministry of Women and Child Development, Government of India, has laid down criteria for adoption in general and SPA in particular, in conjunction with the Juvenile Justice Act (Care and Protection of Children), 2015. There is scant literature on this topic of SPA, more so in India, that looks into the various psychological nuances of SPA from a mental health professional's (MHP) perspective. This review paper aims to assess SPA from the perspective of a MHP that will focus on its various legal nuances as well as the psychological connotations attached to it. For this, a search strategy was employed that included a thorough literature search from two databases (PubMed and Google Scholar) with relevant keywords related to the topic. The various legal issues pertaining to SPA in the current scenario, the psychological issues and challenges faced by single parents, the behavioral outcomes of adoptees who are adopted by single parents, and ways to deal with the various obstacles of SPA are discussed.
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Affiliation(s)
- R Ranjan
- Department of Psychiatry, All India Institute of Medical Sciences, Patna, Bihar, India
| | - S Nath
- Department of Psychiatry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - S Jha
- Department of Psychiatry, All India Institute of Medical Sciences, Patna, Bihar, India
| | - VL Narasimha
- Department of Psychiatry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
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Kumari S, Nath S, Narasimha VL, Sarkar M, Kumar R. Psychosis Unmasking a Diagnosis of Systemic Lupus Erythematosus: a Case Report. East Asian Arch Psychiatry 2023; 33:100-103. [PMID: 37771217 DOI: 10.12809/eaap2316] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/30/2023]
Abstract
Systemic lupus erythematosus (SLE) is an autoimmune disorder that affects multiple organs. Neuropsychiatric SLE (NPSLE) can manifest with a multitude of neurological and psychiatric symptoms. Psychosis is a rare NPSLE manifestation that can occur at any phase of the illness; 21% of SLE-related psychosis cases occur at the onset of SLE, but the evidence base for this is lacking. We report a case of acute-onset psychosis in a woman that led to a diagnosis of SLE, which was substantiated by physical evaluation and laboratory assessments. Assessment of acute-onset psychosis requires consideration of all differential diagnoses, especially in the presence of atypical features. This case also underscores the importance of physical examination and laboratory investigations in psychosis.
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Affiliation(s)
- S Kumari
- Department of Psychiatry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - S Nath
- Department of Psychiatry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - V L Narasimha
- Department of Psychiatry, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - M Sarkar
- Department of General Medicine, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
| | - R Kumar
- Department of General Medicine, All India Institute of Medical Sciences, Deoghar, Jharkhand, India
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Rawool SA, Pai MR, Banerjee AM, Nath S, Bapat RD, Sharma RK, Jagannath, Dutta B, Hassan PA, Tripathi AK. Superior Interfacial Contact Yields Efficient Electron Transfer Rate and Enhanced Solar Photocatalytic Hydrogen Generation in M/C 3N 4 Schottky Junctions. ACS Appl Mater Interfaces 2023; 15:39926-39945. [PMID: 37556210 DOI: 10.1021/acsami.3c05833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
Various literature studies (Table 6) have reported that dispersion of metal nanoparticles (NPs) on graphitic carbon nitride g-C3N4 (M/CN) has considerably improved the photocatalytic hydrogen yield. It is understood that metal NPs create active sites on the surface of CN and act as a cocatalyst. However, the precise changes induced by different metal NPs on the surface of CN still elude us. Here, we report a thorough understanding and comparison of the morphology, metal-support interactions, interfacial charge transfer kinetics, and band characteristics in different M/CN (M = Pt, Pd, Au, Ag, Cu) correlated with photocatalytic activity. Among all metals, Pt/CN was found to be the best performer both under sunlight and UV-visible irradiation. Under sunlight, maximum H2@ 2.7 mmol/h/g was observed over Pt/CN followed by Pd/CN > Au/CN > Ag/CN > Cu/CN ≈ CN. The present study revealed that among all metals, Pt formed superior interfacial contact with g-C3N4 as compared to other metals. The maximum Schottky barrier height (Φb,Pt) of 0.66 V was observed at Pt/CN followed by Φb,Au/CN (0.46 V) and Φb,Pd/CN (0.05 V). The presence of electron-deficient Pt in Pt-XPS, decrease in the intensity of d-DOS of Pt near the Fermi level in VB-XPS, increase in CB tail states, and cathodic shift in Vfb in MS plots sufficiently confirmed strong metal-support interactions in Pt/CN. Due to the SPR effect, Au and Ag NPs suffered from agglomeration and poor dispersion during photodeposition. Finely dispersed Pt NPs (2-4 nm, 53% dispersion) successfully competed with shallow/deep trap states and drove the photogenerated electrons to active metallic sites in a drastically reduced time period as investigated by femtosecond transient absorption spectroscopy. Typically, an interfacial electron transfer rate, KIET,avg, of 2.5 × 1010 s-1 was observed for Pt/CN, while 0.087 × 1010 s-1 was observed in Au/CN. Band alignment/potentials at M/CN Schottky junctions were derived and most favorable in Pt/CN with CB tail states much above the water reduction potential; however, in the case of Pd, these extend much below the H+/H2 potential and hence behave like deep trap states. Thus, in Pd/CN (τ0 = 4200 ps, 49%) and Ag/CN (3870 ps, 53%), electron deep trapping dominates over charge transfer to active sites. The present study will help in designing futuristic new cocatalyst-photocatalyst systems.
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Affiliation(s)
- Sushma A Rawool
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
| | - Mrinal R Pai
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
| | - A M Banerjee
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
| | - S Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
| | - R D Bapat
- Department of Condensed Matter Physics and Materials Science, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005, Maharashtra India
| | - R K Sharma
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India
| | - Jagannath
- Technical Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra, India
| | - B Dutta
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
| | - P A Hassan
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
| | - A K Tripathi
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, Maharashtra India
- Homi Bhabha National Institute, Training School Complex, Anushaktinagar, Mumbai 400094, Maharashtra India
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Nath S, Pountney DL, Neuzil J. Editorial: Synergistic interactions between exosomes and tunneling nanotubes in long-range intercellular transfer. Front Mol Neurosci 2023; 16:1240959. [PMID: 37588056 PMCID: PMC10425545 DOI: 10.3389/fnmol.2023.1240959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 07/05/2023] [Indexed: 08/18/2023] Open
Affiliation(s)
- Sangeeta Nath
- Manipal Institute of Regenerative Medicine, Bangalore, India
- Manipal Academy of Higher Education, Manipal, India
| | - Dean L. Pountney
- School of Pharmacy and Medical Science, Griffith University, Southport, QLD, Australia
| | - Jiri Neuzil
- School of Pharmacy and Medical Science, Griffith University, Southport, QLD, Australia
- Institute of Biotechnology, Czech Academy of Sciences, Prague-West, Czechia
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Kumar S, Ganguly R, Nath S, Aswal VK. Pluronic Induced Interparticle Attraction and Re-entrant Liquid-Liquid Phase Separation in Charged Silica Nanoparticle Suspensions. Langmuir 2023. [PMID: 37269303 DOI: 10.1021/acs.langmuir.3c00491] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Tuning surface properties of nanoparticles by introducing charge, surface functionalization, or polymer grafting is central to their stability and applications. Here, we show that introducing non-DLVO forces like steric and hydrophobic effects in charged silica nanoparticle suspensions through interaction with a nonionic surfactant brings about interesting modulations in their interparticle interaction and phase behavior. The Ludox TM-40 negatively charged silica suspensions thus exhibit liquid-liquid phase separation driven by the onset of interparticle attraction in the system in the presence of the triblock copolymer Pluronic P123. The observed phase separations are thermoresponsive in nature, as they are associated with lower consolute temperatures and a re-entrant behavior as a function of temperature. The nanoparticle-Pluronic system thus undergoes transformation from one-phase to two-phase and then back to one-phase with monotonic increase in temperature. Evolution of the interparticle interaction in the composite system is investigated by dynamic light scattering (DLS), small angle neutron scattering (SANS), zeta potential, rheological, and fluorescence spectroscopy studies. Zeta potential studies show that the charge interaction in the system is partially mitigated through adsorption of a Pluronic micellar layer on the nanoparticle surfaces. Contrast-matching SANS studies suggest that hydrophobic interactions between the adsorbed micellar layer bring about the onset of interparticle attraction in the system. The results are unique and not reported hitherto in charged silica nanoparticle systems.
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Affiliation(s)
- S Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - R Ganguly
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S Nath
- Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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Valappil DK, Mini NJ, Dilna A, Nath S. Membrane interaction to intercellular spread of pathology in Alzheimer’s disease. Front Neurosci 2022; 16:936897. [PMID: 36161178 PMCID: PMC9500529 DOI: 10.3389/fnins.2022.936897] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Accepted: 08/24/2022] [Indexed: 11/22/2022] Open
Abstract
Progressive development of pathology is one of the major characteristic features of neurodegenerative diseases. Alzheimer’s disease (AD) is the most prevalent among them. Extracellular amyloid-β (Aβ) plaques and intracellular tau neurofibrillary tangles are the pathological phenotypes of AD. However, cellular and animal studies implicate tau as a secondary pathology in developing AD while Aβ aggregates is considered as a trigger point. Interaction of Aβ peptides with plasma membrane (PM) seems to be a promising site of involvement in the events that lead to AD. Aβ binding to the lipid membranes initiates formation of oligomers of Aβ species, and these oligomers are known as primary toxic agents for neuronal toxicities. Once initiated, neuropathological toxicities spread in a “prion-like” fashion probably through the mechanism of intercellular transfer of pathogenic aggregates. In the last two decades, several studies have demonstrated neuron-to-neuron transfer of neurodegenerative proteins including Aβ and tau via exosomes and tunneling nanotubes (TNTs), the two modes of long-range intercellular transfer. Emerging pieces of evidence indicate that molecular pathways related to the biogenesis of exosomes and TNTs interface with endo-lysosomal pathways and cellular signaling in connection to vesicle recycling-imposed PM and actin remodulation. In this review, we discuss interactions of Aβ aggregates at the membrane level and its implications in intercellular spread of pathogenic aggregates. Furthermore, we hypothesize how spread of pathogenic aggregates contributes to complex molecular events that could regulate pathological and synaptic changes related to AD.
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Affiliation(s)
| | | | | | - Sangeeta Nath
- *Correspondence: Sangeeta Nath, ; orcid.org/0000-0003-0050-0606
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Valappil DK, Raghavan A, Nath S. Detection and Quantification of Tunneling Nanotubes Using 3D Volume View Images. J Vis Exp 2022. [DOI: 10.3791/63992] [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: 10/31/2022] Open
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Pattnaik J, Nath N, Nath S. Challenges to Remote Instruction During the Pandemic: A Qualitative Study with Primary Grade Teachers in India. Early Child Educ J 2022; 51:675-684. [PMID: 35287284 PMCID: PMC8907896 DOI: 10.1007/s10643-022-01331-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/24/2022] [Indexed: 06/14/2023]
Abstract
The COVID-19 pandemic has profound implications for education of young children worldwide and especially for children in developing economies like India. This article presents a qualitative study that explored the challenges that private school teachers in low budget, mid-ranged, and high fee charging private schools faced in two cities in India. All the private schools in this study also followed the government mandate to reserve 25% of seats for children from low-income families. During the school closure, remote instruction was employed in schools where participating teachers taught. Teachers faced challenges related to parental involvement and children's participation in remote instruction. Parental involvement challenges included parental lack of access to technological devices and no or minimal access to internet for their children to participate in remote instruction activities. Parental lack of support due to their low technological literacy and literacy in general, lack of fluency in the English Language, as well as lack of time also contributed to their children's low participation in remote instruction. Teachers faced challenges in implementing remote instruction with children from different socio-economic backgrounds; however, the challenges were greater with families from low-income backgrounds. The study's findings suggest that governments around the world need to ensure children's access to digital tools and internet services which are essential elements in children's participation in remote instruction. For children in families where parents are unable to support their children's education at home, other support services may be instituted to take the pressure off of parents. Future studies may explore the 'learning loss' that may have resulted from the long school closure during the pandemic.
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Affiliation(s)
- Jyotsna Pattnaik
- College of Education, California State University, Long Beach, 1250 Bellflower Blvd., Long Beach, CA 90840 USA
| | - Nibedita Nath
- School of Anthropology, Gangadhar Meher University (GMU), Sambalpur, Odisha 768001 India
| | - Sangeeta Nath
- Oriental College of Education, University of Mumbai, Sec 2, Sanpada, Navi Mumbai, Maharashtra 400705 India
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Nain D, Mohanty TK, Dewry RK, Bhakat M, Nath S, Gupta VK, Parray MA. Butylated hydroxytoluene (bht) improves the post-thaw semen quality in low-dose sperm cryopreservation in murrah buffalo bull. Cryo Letters 2022; 44:57-65. [PMID: 36625876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
BACKGROUND Cryopreservation is an important technique for the long-term storage of semen for artificial insemination (AI). Buffalo spermatozoa are sensitive to cryopreservation procedures because of the presence of a high amount of polyunsaturated fatty acids in the plasma membrane. OBJECTIVE To study the effect of different concentrations of BHT on the quality of Murrah buffalo bull semen for low-dose cryopreservation. MATERIAL AND METHODS Semen was collected from four high fertile Murrah buffalo bulls (6 ejaculates each) using an artificial vagina. A total of 24 ejaculates were collected from each bull twice a week using an artificial vagina. Every sample was split into four parts: Control without additives; and three treatments with BHT at 0.5 mM, 1 mM or 2 mM. Semen was cryopreserved at low-dose sperm cryopreservation of 20, 15, 10 and 5 million sperm per aliquot after supplementation of BHT. Semen samples were evaluated for fresh, pre-freeze and post-thaw stages. RESULTS There was a significant increase (p<0.05) in sperm quality parameters, such as progressive motility (%), viability (%), HOST response (%), acrosome integrity (%) and post-thaw motility, with the addition of 0.5-1 mM BHT. CONCLUSION The addition of BHT in Murrah buffalo semen improves the low dose cryopreservation quality in a dose-dependent manner. doi.org/10.54680/fr23110110612.
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Affiliation(s)
- D Nain
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
| | - T K Mohanty
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
| | - R Kr Dewry
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India.
| | - M Bhakat
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
| | - S Nath
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
| | - V K Gupta
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
| | - M A Parray
- Artificial Breeding Research Centre, ICAR-National Dairy Research Institute, Karnal-132001, (Haryana), India
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Ganguly R, Kumar S, Nath S, Basu M, Aswal VK. Unusual Growth and Hydration Characteristics of Oil Solubilized Micelles in Aqueous Pluronic Systems. J Phys Chem B 2021; 125:10578-10588. [PMID: 34495673 DOI: 10.1021/acs.jpcb.1c04450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Lipophile induced modulations of self-assembly characteristics in aqueous Pluronic systems merit attention because of wide-ranging uses of Pluronics as solubilizing agents of lipophilic substances. In this paper, we report unusual evolutions of structural and hydration properties in lavender essential oil (LO) solubilized Pluronic P85 aqueous micellar systems as a function of micellar volume fraction and temperature. Our DLS, SANS, and viscometry studies show that the spherical-to-wormlike micellar structural transition observed in 1% P85 solutions upon solubilization of LO quite unexpectedly gets suppressed with increased P85 concentration to ≥5%. Detailed SANS studies reveal that the core sizes of the oil solubilized micelles cannot attain the threshold value required for the onset of structural transition at higher copolymer concentrations due to their progressive shrinking with an increase in P85 concentration. Oil solubilized P85 solutions show two cloud points and very interestingly exhibit micellar growth upon cooling to their lower cloud points. Steady state fluorescence studies explain this based on increasing dehydration of micellar corona with a decrease in temperature, very much opposite to what is observed in pure aqueous Pluronic systems. The results give new insight into viscous flow properties and low temperature storage possibilities of oil solubilized aqueous Pluronic systems.
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Affiliation(s)
- R Ganguly
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S Kumar
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - S Nath
- Radiation & Photochemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - M Basu
- Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India
| | - V K Aswal
- Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India
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13
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Dilna A, Deepak KV, Damodaran N, Kielkopf CS, Kagedal K, Ollinger K, Nath S. Amyloid-β induced membrane damage instigates tunneling nanotube-like conduits by p21-activated kinase dependent actin remodulation. Biochim Biophys Acta Mol Basis Dis 2021; 1867:166246. [PMID: 34403739 DOI: 10.1016/j.bbadis.2021.166246] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [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: 04/23/2021] [Revised: 07/19/2021] [Accepted: 08/09/2021] [Indexed: 12/29/2022]
Abstract
Alzheimer's disease (AD) pathology progresses gradually via anatomically connected brain regions. Direct transfer of amyloid-β1-42 oligomers (oAβ) between connected neurons has been shown, however, the mechanism is not fully revealed. We observed formation of oAβ induced tunneling nanotubes (TNTs)-like nanoscaled f-actin containing membrane conduits, in differentially differentiated SH-SY5Y neuronal models. Time-lapse images showed that oAβ propagate from one cell to another via TNT-like structures. Preceding the formation of TNT-like conduits, we detected oAβ-induced plasma membrane (PM) damage and calcium-dependent repair through lysosomal-exocytosis, followed by massive endocytosis to re-establish the PM. Massive endocytosis was monitored by an influx of the membrane-staining dye TMA-DPH and PM damage was quantified by propidium iodide influx in the absence of Ca2+. The massive endocytosis eventually caused accumulation of internalized oAβ in Lamp1 positive multivesicular bodies/lysosomes via the actin cytoskeleton remodulating p21-activated kinase1 (PAK1) dependent endocytic pathway. Three-dimensional quantitative confocal imaging, structured illumination superresolution microscopy, and flowcytometry quantifications revealed that oAβ induces activation of phospho-PAK1, which modulates the formation of long stretched f-actin extensions between cells. Moreover, the formation of TNT-like conduits was inhibited by preventing PAK1-dependent internalization of oAβ using the small-molecule inhibitor IPA-3, a highly selective cell-permeable auto-regulatory inhibitor of PAK1. The present study reveals that the TNT-like conduits are probably instigated as a consequence of oAβ induced PM damage and repair process, followed by PAK1 dependent endocytosis and actin remodeling, probably to maintain cell surface expansion and/or membrane tension in equilibrium.
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Affiliation(s)
- Aysha Dilna
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India
| | - K V Deepak
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India
| | - Nandini Damodaran
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India
| | - Claudia S Kielkopf
- Experimental Pathology, Department of Biomedical and Clinical Sciences Linköping University, 581 85 Linköping, Sweden
| | - Katarina Kagedal
- Experimental Pathology, Department of Biomedical and Clinical Sciences Linköping University, 581 85 Linköping, Sweden
| | - Karin Ollinger
- Experimental Pathology, Department of Biomedical and Clinical Sciences Linköping University, 581 85 Linköping, Sweden
| | - Sangeeta Nath
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India.
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Nath S, Handsley-Davis M, Weyrich LS, Jamieson LM. Diversity and bias in oral microbiome research: A commentary. EClinicalMedicine 2021; 36:100923. [PMID: 34124638 PMCID: PMC8173262 DOI: 10.1016/j.eclinm.2021.100923] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 11/28/2022] Open
Affiliation(s)
- S Nath
- University of Adelaide, Adelaide, South Australia, Australia
| | | | - L S Weyrich
- Penn State University Abington-Ogontz Campus: Penn State Abington, PA, USA
| | - L M Jamieson
- University of Adelaide, Adelaide, South Australia, Australia
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15
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Tiwari S, Mohanty TK, Bhakat M, Kumar N, Baithalu RK, Nath S, Yadav HP, Dewry RK. Comparative evidence support better antioxidant efficacy of mitochondrial-targeted (Mitoquinone) than cytosolic (Resveratrol) antioxidant in improving in-vitro sperm functions of cryopreserved buffalo (Bubalus bubalis) semen. Cryobiology 2021; 101:125-134. [PMID: 33933431 DOI: 10.1016/j.cryobiol.2021.04.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [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: 01/15/2021] [Revised: 04/06/2021] [Accepted: 04/23/2021] [Indexed: 12/12/2022]
Abstract
The present study compared the effect of mitochondria-targeted (Mitoquinone, MitoQ) and untargeted cytosolic antioxidant (Resveratrol, RESV) supplementation on lipid peroxidation (LPO) and in-vitro sperm functions of cryopreserved buffalo bull semen. To optimize additive's concentration, sperm pellet obtained from twenty-four ejaculates was supplemented with different concentrations of MitoQ (20 nM, 100 nM, 200 nM); and RESV (10 μM, 25 μM, 50 μM) against control in the extender. The post-thaw sperm motility, livability, and membrane integrity were higher (P < 0.05) in 200 nM MitoQ and 50 μM RESV than other concentrations used. In another experiment, sperm pellet from thirty-two ejaculates was supplemented with 200 nM MitoQ and 50 μM RESV in the extender. Pre-freeze and post-thaw progressive motility and livability were higher (P < 0.05) in MitoQ (200 nM) than RESV (50 μM) treatment. MitoQ supplementation improved post-thaw membrane integrity (CFDA-PI) higher (P < 0.05) than RESV, however, hypo-osmotic swelling response observed no improvement with RESV treatment. Post-thaw LPO rate was lower (P < 0.05) and Bovine cervical mucus penetration was higher (P < 0.05) in MitoQ than RESV treatment. In post-thaw semen, MitoQ showed higher (P < 0.05) proportion of acrosome intact (FITC-PNA), live non-apoptotic (P < 0.01) sperm with a higher reduction (P < 0.05) in membrane scrambling. MitoQ improved (P < 0.01) proportion of sperm with high Mitochondrial Membrane Potential and low LPO (P < 0.01) than RESV treatment. In conclusion, improvement in post-thaw in-vitro sperm functions and cryo-tolerance was more evident in MitoQ than RESV supplemented buffalo bull semen. Our study provides a better strategy to mitigate oxidative stress by enhancing mitochondrial antioxidant system with targeted antioxidants than cytosolic antioxidant supplementation.
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Affiliation(s)
- S Tiwari
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - T K Mohanty
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - M Bhakat
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - N Kumar
- Animal Reproduction, Gynaecology and Obstetrics, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - R K Baithalu
- Animal Reproduction, Gynaecology and Obstetrics, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - S Nath
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - H P Yadav
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
| | - R K Dewry
- Artificial Breeding Research Centre, LPM Division, ICAR-National Dairy Research Institute, Karnal, Haryana, India.
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16
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Oberortner E, Evans R, Meng X, Nath S, Plahar H, Simirenko L, Tarver A, Deutsch S, Hillson NJ, Cheng JF. An Integrated Computer-Aided Design and Manufacturing Workflow for Synthetic Biology. Methods Mol Biol 2021; 2205:3-18. [PMID: 32809190 DOI: 10.1007/978-1-0716-0908-8_1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
Biological computer-aided design and manufacturing (bioCAD/CAM) tools facilitate the design and build processes of engineering biological systems using iterative design-build-test-learn (DBTL) cycles. In this book chapter, we highlight some of the bioCAD/CAM tools developed and used at the US Department of Energy (DOE) Joint Genome Institute (JGI), Joint BioEnergy Institute (JBEI), and Agile BioFoundry (ABF). We demonstrate the use of these bioCAD/CAM tools on a common workflow for designing and building a multigene pathway in a hierarchical fashion. Each tool presented in this book chapter is specifically tailored to support one or more specific steps in a workflow, can be integrated with the others into design and build workflows, and can be deployed at academic, government, or commercial entities.
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Affiliation(s)
- Ernst Oberortner
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA. .,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.
| | - Robert Evans
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Xianwei Meng
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Sangeeta Nath
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Hector Plahar
- Biological Systems & Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Technology Division, DOE Joint BioEnergy Institute (JBEI), Emeryville, CA, USA
| | - Lisa Simirenko
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Angela Tarver
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Samuel Deutsch
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Nathan J Hillson
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Biological Systems & Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA, USA.,Technology Division, DOE Joint BioEnergy Institute (JBEI), Emeryville, CA, USA.,DOE Agile BioFoundry, Emeryville, CA, USA.,TeselaGen Biotechnology, Inc., San Francisco, CA, USA
| | - Jan-Fang Cheng
- DOE Joint Genome Institute (JGI), Berkeley, CA, USA.,Environmental Genomics & Systems Biology, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
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17
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Ma Z, Liu X, Nath S, Sun H, Tran TM, Yang L, Mayor S, Miao Y. Formin nanoclustering-mediated actin assembly during plant flagellin and DSF signaling. Cell Rep 2021; 34:108884. [PMID: 33789103 DOI: 10.1016/j.celrep.2021.108884] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [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: 08/06/2020] [Revised: 01/11/2021] [Accepted: 02/25/2021] [Indexed: 12/19/2022] Open
Abstract
Plants respond to bacterial infection acutely with actin remodeling during plant immune responses. The mechanisms by which bacterial virulence factors (VFs) modulate plant actin polymerization remain enigmatic. Here, we show that plant-type-I formin serves as the molecular sensor for actin remodeling in response to two bacterial VFs: Xanthomonas campestris pv. campestris (Xcc) diffusible signal factor (DSF), and pathogen-associated molecular pattern (PAMP) flagellin in pattern-triggered immunity (PTI). Both VFs regulate actin assembly by tuning the clustering and nucleation activity of formin on the plasma membrane (PM) at the nano-sized scale. By being integrated within the cell-wall-PM-actin cytoskeleton (CW-PM-AC) continuum, the dynamic behavior and function of formins are highly dependent on each scaffold layer's composition within the CW-PM-AC continuum during both DSF and PTI signaling. Our results reveal a central mechanism for rapid actin remodeling during plant-bacteria interactions, in which bacterial signaling molecules fine tune plant formin nanoclustering in a host mechanical-structure-dependent manner.
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Affiliation(s)
- Zhiming Ma
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Xiaolin Liu
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Sangeeta Nath
- Institute for Stem Cell Biology and Regenerative Medicine, Bellary Road, Bangalore 560065, India; Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India
| | - He Sun
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Tuan Minh Tran
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Liang Yang
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore; Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore; School of Medicine, Southern University of Science and Technology, 1088 Xueyuan Blvd., Nanshan District, Shenzhen 518055, China
| | - Satyajit Mayor
- Institute for Stem Cell Biology and Regenerative Medicine, Bellary Road, Bangalore 560065, India; National Centre for Biological Sciences, Tata Institute for Fundamental Research, Bellary Road, Bangalore 560065, India
| | - Yansong Miao
- School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore.
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18
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Tran TM, Ma Z, Triebl A, Nath S, Cheng Y, Gong BQ, Han X, Wang J, Li JF, Wenk MR, Torta F, Mayor S, Yang L, Miao Y. The bacterial quorum sensing signal DSF hijacks Arabidopsis thaliana sterol biosynthesis to suppress plant innate immunity. Life Sci Alliance 2020; 3:e202000720. [PMID: 32788227 PMCID: PMC7425213 DOI: 10.26508/lsa.202000720] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2020] [Revised: 07/26/2020] [Accepted: 07/30/2020] [Indexed: 01/04/2023] Open
Abstract
Quorum sensing (QS) is a recognized phenomenon that is crucial for regulating population-related behaviors in bacteria. However, the direct specific effect of QS molecules on host biology is largely understudied. In this work, we show that the QS molecule DSF (cis-11-methyl-dodecenoic acid) produced by Xanthomonas campestris pv. campestris can suppress pathogen-associated molecular pattern-triggered immunity (PTI) in Arabidopsis thaliana, mediated by flagellin-induced activation of flagellin receptor FLS2. The DSF-mediated attenuation of innate immunity results from the alteration of FLS2 nanoclusters and endocytic internalization of plasma membrane FLS2. DSF altered the lipid profile of Arabidopsis, with a particular increase in the phytosterol species, which impairs the general endocytosis pathway mediated by clathrin and FLS2 nano-clustering on the plasma membrane. The DSF effect on receptor dynamics and host immune responses could be entirely reversed by sterol removal. Together, our results highlighted the importance of sterol homeostasis to plasma membrane organization and demonstrate a novel mechanism by which pathogenic bacteria use their communicating molecule to manipulate pathogen-associated molecular pattern-triggered host immunity.
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Affiliation(s)
- Tuan Minh Tran
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Zhiming Ma
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Alexander Triebl
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Sangeeta Nath
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore, India
| | - Yingying Cheng
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Ben-Qiang Gong
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xiao Han
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Junqi Wang
- Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Jian-Feng Li
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Markus R Wenk
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Federico Torta
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Satyajit Mayor
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India
- National Centre for Biological Sciences, Tata Institute for Fundamental Research, Bangalore, India
| | - Liang Yang
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Yansong Miao
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore
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19
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Tran TM, Ma Z, Triebl A, Nath S, Cheng Y, Gong BQ, Han X, Wang J, Li JF, Wenk MR, Torta F, Mayor S, Yang L, Miao Y. The bacterial quorum sensing signal DSF hijacks Arabidopsis thaliana sterol biosynthesis to suppress plant innate immunity. Life Sci Alliance 2020. [PMID: 32788227 DOI: 10.1101/927731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/30/2023] Open
Abstract
Quorum sensing (QS) is a recognized phenomenon that is crucial for regulating population-related behaviors in bacteria. However, the direct specific effect of QS molecules on host biology is largely understudied. In this work, we show that the QS molecule DSF (cis-11-methyl-dodecenoic acid) produced by Xanthomonas campestris pv. campestris can suppress pathogen-associated molecular pattern-triggered immunity (PTI) in Arabidopsis thaliana, mediated by flagellin-induced activation of flagellin receptor FLS2. The DSF-mediated attenuation of innate immunity results from the alteration of FLS2 nanoclusters and endocytic internalization of plasma membrane FLS2. DSF altered the lipid profile of Arabidopsis, with a particular increase in the phytosterol species, which impairs the general endocytosis pathway mediated by clathrin and FLS2 nano-clustering on the plasma membrane. The DSF effect on receptor dynamics and host immune responses could be entirely reversed by sterol removal. Together, our results highlighted the importance of sterol homeostasis to plasma membrane organization and demonstrate a novel mechanism by which pathogenic bacteria use their communicating molecule to manipulate pathogen-associated molecular pattern-triggered host immunity.
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Affiliation(s)
- Tuan Minh Tran
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Zhiming Ma
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Alexander Triebl
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Sangeeta Nath
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India
- Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore, India
| | - Yingying Cheng
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
| | - Ben-Qiang Gong
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xiao Han
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
| | - Junqi Wang
- Department of Biology, Southern University of Science and Technology, Shenzhen, China
| | - Jian-Feng Li
- School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Markus R Wenk
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Federico Torta
- Department of Biochemistry, Singapore Lipidomics Incubator (SLING), Yoo Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore
| | - Satyajit Mayor
- Institute for Stem Cell Biology and Regenerative Medicine, Bangalore, India
- National Centre for Biological Sciences, Tata Institute for Fundamental Research, Bangalore, India
| | - Liang Yang
- Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore, Singapore
- School of Medicine, Southern University of Science and Technology, Shenzhen, China
| | - Yansong Miao
- School of Biological Sciences, Nanyang Technological University, Singapore, Singapore
- School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore
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20
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Khaykin Y, Alipour P, Azizi Z, Avoulov A, Jansen C, Donegan S, Morris S, Nath S, Tamjidi S, Varah N, Pantano A, Verma A, Weaver B, Hunter TD. P1409Effectiveness of atrial fibrillation ablation using a contact force stability module with contact force or non-contact force catheter. Europace 2020. [DOI: 10.1093/europace/euaa162.092] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Abstract
Funding Acknowledgements
This study was funded by Biosense Webster, Inc.
Background
Catheter ablation is a mainstream treatment option for atrial fibrillation (AF). Recently, contact force (CF) enabled ablation catheters and a stability module were developed to allow for real-time CF sensing and improvement of catheter-tissue stability, which is important for achieving an optimal clinical outcome. We assessed the relative effectiveness of these new technologies, as well as the optimal CF stability parameters, in a real-world setting.
Purpose
To compare the clinical effectiveness of AF ablations performed with a CF catheter using location stability settings of 2.5 mm maximum distance for 12 s minimum (2.5/12) vs. a non-CF catheter with settings of 3 mm for 7 s (3/7).
Methods
Within 1/14–4/18, 176 de novo AF ablations using either a CF catheter with stability settings of 2.5/12 (n = 92, 5/16–4/18) or a non-CF catheter with stability settings of 3/7 (n = 84, 1/14–3/14) were performed by a single operator at a Canadian medical center. Patients routinely wore 48 hour Holter monitors every three months through the first year. The primary measures of effectiveness were Kaplan-Meier (KM) survival estimates of freedom from AF/atrial tachycardia (AT)/atrial flutter (AFL) recurrence after a 3-month blanking period and reablation.
Results
The CF group was 62.9 ± 10.0 years old, 57.6% male, and 66.3% paroxysmal (PAF). The non-CF group was 61.6 ± 9.9 years old, 63.1% male, and 76.2% PAF. Procedural complications consisted of a single vascular access complication in the non-CF group. The 12-month estimate of freedom from AF/AT/AFL recurrence was 79.4% in the CF group vs. 64.8% in the non-CF group (p = 0.058 for difference in survival over time). 12-month freedom from reablation was 90.4% in the CF group vs. 70.5% in the non-CF group (p = 0.002).
Conclusion
CF ablation with more stringent stability settings of 2.5/12 was more effective than non-CF ablation with stability settings of 3/7, likely attributable to the CF catheter enabling visualization of catheter-tissue contact and the stability module facilitating maintenance of CF stability during ablation.
Abstract Figure.
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Affiliation(s)
- Y Khaykin
- Southlake Regional Health Centre, Newmarket, Canada
| | - P Alipour
- Southlake Regional Health Centre, Newmarket, Canada
| | - Z Azizi
- Southlake Regional Health Centre, Newmarket, Canada
| | - A Avoulov
- Southlake Regional Health Centre, Newmarket, Canada
| | - C Jansen
- Southlake Regional Health Centre, Newmarket, Canada
| | - S Donegan
- Southlake Regional Health Centre, Newmarket, Canada
| | - S Morris
- Southlake Regional Health Centre, Newmarket, Canada
| | - S Nath
- Southlake Regional Health Centre, Newmarket, Canada
| | - S Tamjidi
- Southlake Regional Health Centre, Newmarket, Canada
| | - N Varah
- Southlake Regional Health Centre, Newmarket, Canada
| | - A Pantano
- Southlake Regional Health Centre, Newmarket, Canada
| | - A Verma
- Southlake Regional Health Centre, Newmarket, Canada
| | - B Weaver
- CTI Clinical Trial and Consulting Services, Real World Evidence, Covington, United States of America
| | - T D Hunter
- CTI Clinical Trial and Consulting Services, Real World Evidence, Covington, United States of America
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21
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Pulikkotil SJ, Nath S, Ramachandran V. Determinants of periodontitis among a rural Indian population: A case control study. Community Dent Health 2020; 37:26-31. [PMID: 32031346 DOI: 10.1922/cdh_4632pulikkotil06] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVES Identify the determinants of periodontitis in a rural Indian population aged 35-44 years. BASIC RESEARCH DESIGN Case-control clinical and questionnaire study in a cluster sample of 50 villages. METHODS A total of 3000 persons were screened for the presence of periodontitis using the CDC case definition in full mouth examination. Equal numbers of cases (604 persons with periodontitis) and controls (604 without periodontitis) were recruited and interviewed with a piloted questionnaire. Univariate and multivariate analysis estimated crude and adjusted odds ratios (aOR) respectively with 95% confidence limits. RESULTS Six factors were determined by multivariate analysis to predict periodontitis: education less than or equal to twelve years of schooling (aOR=2.51, 95% CI=1.18-5.34), alcohol consumption (aOR= 1.7, 95% CI=1.16-2.49), consuming a non-vegetarian diet (aOR=1.38, 95% CI=1.08-1.76), not drinking milk (aOR=1.7, 95% CI= 1.29-2.24), not using a toothbrush for cleaning of teeth (aOR=2.98, 95% CI =1.71-5.21) and not cleaning teeth at least once a day (aOR=2.13, 95% CI=1.58-2.87). CONCLUSION Risk factors for periodontitis in a rural Indian population were identified. Further studies should validate these findings and appropriate recommendations should be developed to decrease the prevalence and burden of periodontitis in this population.
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Affiliation(s)
- S J Pulikkotil
- Associate Professor, Department of Restorative dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - S Nath
- Reader, Kusum Devi Sunderlal Dugar Jain Dental College and Hospital, Kolkata, India
| | - V Ramachandran
- Deputy Director (Retired), National Institute of Epidemiology, India
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22
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Pulikkotil SJ, Nath S, Dharamarajan L, Jing KT, Vaithilingam RD. Alcohol consumption is associated with periodontitis. A systematic review and meta-analysis of observational studies. Community Dent Health 2020; 37:12-21. [PMID: 32031339 DOI: 10.1922/cdh_4569pulikkotil10] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE To determine whether alcohol consumption is associated with the risk of periodontitis. BASIC RESEARCH DESIGN Systematic review and meta-analysis of observational studies performed using the Preferred Reporting Items for Systematic Review and Meta-Analyses guidelines. METHOD PubMed and Scopus were searched for eligible articles published in English from inception till November 2018. The quality of studies was assessed by the Newcastle Ottawa Scale. Pooled odds ratios (OR) and 95% confidence intervals (CI) were calculated for the risk of periodontitis associated with highest versus lowest/non-alcohol in a random effects meta-analysis model. Heterogeneity and sensitivity were investigated in meta regression analysis. A funnel plot was used to assess publication bias. RESULTS Twenty-nine observational studies were included. One study with two separate datasets was considered as two separate studies for analysis. Alcohol consumption was significantly associated with the presence of periodontitis (OR = 1.26, 95% CI= 1.11-1.41). Significant heterogeneity (I2=71%) was present in the overall analysis, primarily attributable to sampling cross-sectional studies (I2=76.6%). A funnel plot and Egger tests (p=0.0001) suggested the presence of publication bias. CONCLUSION Alcohol consumption was associated with increased occurrence of periodontitis and should be considered as a parameter in periodontal risk assessment. Publication bias should be explored in future studies.
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Affiliation(s)
- S J Pulikkotil
- Division of Clinical Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - S Nath
- Department of Periodontology, Kusum Devi Sunderlal Dugar Jain Dental College and Hospital, Kolkata, India
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- Department of Periodontology, Tamil Nadu Government Dental College, Chennai, India
| | - L Dharamarajan
- Masters in Molecular Medicine, School of Post graduate studies, International Medical University, Kuala Lumpur, Malaysia
| | - K T Jing
- Dental Officer, Klinik Pergigian Jitra, Ministry of Health, Malaysia
| | - R D Vaithilingam
- Department of Restorative Dentistry, Faculty of Dentistry, University of Malaya, Kuala Lumpur, Malaysia
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23
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Trevillion K, Ryan EG, Pickles A, Heslin M, Byford S, Nath S, Bick D, Milgrom J, Mycroft R, Domoney J, Pariante C, Hunter MS, Howard LM. An exploratory parallel-group randomised controlled trial of antenatal Guided Self-Help (plus usual care) versus usual care alone for pregnant women with depression: DAWN trial. J Affect Disord 2020; 261:187-197. [PMID: 31634678 DOI: 10.1016/j.jad.2019.10.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 08/30/2019] [Accepted: 10/09/2019] [Indexed: 01/22/2023]
Abstract
BACKGROUND Depression is a common antenatal mental disorder associated with significant maternal morbidity and adverse fetal outcomes. However, there is a lack of research on the effectiveness or cost-effectiveness of psychological interventions for antenatal depression. METHODS A parallel-group, exploratory randomised controlled trial across five hospitals. The trial compared Guided Self-Help, modified for pregnancy, plus usual care with usual care alone for pregnant women meeting DSM-IV criteria for mild-moderate depression. The trial objectives were to establish recruitment/follow-up rates, compliance and acceptability, and to provide preliminary evidence of intervention efficacy and cost-effectiveness. The primary outcome of depressive symptoms was assessed by blinded researchers using the Edinburgh Postnatal Depression Scale at 14-weeks post-randomisation. RESULTS 620 women were screened, 114 women were eligible and 53 (46.5%) were randomised. 26 women received Guided Self-Help - 18 (69%) attending ≥4 sessions - and 27 usual care; n = 3 women were lost to follow-up (follow-up rate for primary outcome 92%). Women receiving Guided Self-Help reported fewer depressive symptoms at follow-up than women receiving usual care (adjusted effect size -0.64 (95%CI: -1.30, 0.06) p = 0.07). There were no trial-related adverse events. The cost-effectiveness acceptability curve showed the probability of Guided Self-Help being cost-effective compared with usual care ranged from 10 to 50% with a willingness-to-pay range from £0 to £50,000. CONCLUSIONS AND LIMITATIONS Despite intense efforts we did not meet our anticipated recruitment target. However, high levels of acceptability, a lack of adverse events and a trend towards improvements in symptoms of depression post-treatment indicates this intervention is suitable for talking therapy services.
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Affiliation(s)
- K Trevillion
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom.
| | - E G Ryan
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom; Warwick Clinical Trials Unit, Warwick Medical School, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - A Pickles
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - M Heslin
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - S Byford
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - S Nath
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - D Bick
- Departmentof Women and Children's Health, School of Life Course Sciences, Faculty of Life Sciences and Medicine, King's College London, United Kingdom
| | - J Milgrom
- University of Melbourne and Parent-Infant Research Institute, Melbourne, Australia
| | - R Mycroft
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - J Domoney
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - C Pariante
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - M S Hunter
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
| | - L M Howard
- Institute of Psychiatry, Psychology & Neuroscience at King's College London, United Kingdom
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Sil P, Mateos N, Nath S, Buschow S, Manzo C, Suzuki KGN, Fujiwara T, Kusumi A, Garcia-Parajo MF, Mayor S. Dynamic actin-mediated nano-scale clustering of CD44 regulates its meso-scale organization at the plasma membrane. Mol Biol Cell 2019; 31:561-579. [PMID: 31577524 PMCID: PMC7202065 DOI: 10.1091/mbc.e18-11-0715] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Transmembrane adhesion receptors at the cell surface, such as CD44, are often equipped with modules to interact with the extracellular matrix (ECM) and the intracellular cytoskeletal machinery. CD44 has been recently shown to compartmentalize the membrane into domains by acting as membrane pickets, facilitating the function of signaling receptors. While spatial organization and diffusion studies of membrane proteins are usually conducted separately, here we combine observations of organization and diffusion by using high spatio-temporal resolution imaging on living cells to reveal a hierarchical organization of CD44. CD44 is present in a meso-scale meshwork pattern where it exhibits enhanced confinement and is enriched in nanoclusters of CD44 along its boundaries. This nanoclustering is orchestrated by the underlying cortical actin dynamics. Interaction with actin is mediated by specific segments of the intracellular domain. This influences the organization of the protein at the nano-scale, generating a selective requirement for formin over Arp2/3-based actin-nucleation machinery. The extracellular domain and its interaction with elements of ECM do not influence the meso-scale organization, but may serve to reposition the meshwork with respect to the ECM. Taken together, our results capture the hierarchical nature of CD44 organization at the cell surface, with active cytoskeleton-templated nanoclusters localized to a meso-scale meshwork pattern.
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Affiliation(s)
- Parijat Sil
- National Centre for Biological Sciences (NCBS)
| | - Nicolas Mateos
- ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, Barcelona 08860, Spain
| | - Sangeeta Nath
- Institute of Stem Cell and Regenerative Medicine.,Manipal Institute of Regenerative Medicine, Manipal Academy of Higher Education, Bangalore 560065, India
| | - Sonja Buschow
- Department of Gastroenterology and Hepatology, Erasmus University Medical Center Rotterdam, Rotterdam 3015 GD Rotterdam, The Netherlands
| | - Carlo Manzo
- Facultat de Ciències i Tecnologia, Universitat de Vic-Universitat Central de Catalunya, Vic 08500, Spain
| | - Kenichi G N Suzuki
- Centre for Highly Advanced Integration of Nano and Life Sciences (G-CHAIN), Gifu University, Gifu 501-1193, Japan.,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto 606-8501, Japan
| | - Takahiro Fujiwara
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto 606-8501, Japan
| | - Akihiro Kusumi
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto 606-8501, Japan.,Okinawa Institute of Science and Technology, Graduate University, Okinawa 904-0412, Japan
| | - Maria F Garcia-Parajo
- Institute of Stem Cell and Regenerative Medicine.,Institució Catalana de Recerca i Estudis Avançats (ICREA), 08010 Barcelona, Spain
| | - Satyajit Mayor
- National Centre for Biological Sciences (NCBS).,Institute of Stem Cell and Regenerative Medicine
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Shamiss Y, Alipour P, Azizi Z, Donegan S, Varah N, Avoulov A, Nath S, Jansen C, Tamjidi S, Morris S, Tohidi H, Lightstone H, Shusterman A, Khaykin Y. EVALUATION OF NOVEL ORAL ANTICOAGULANT PRESCRIPTION PATTERNS IN A TERTIARY CARE CLINIC. Can J Cardiol 2019. [DOI: 10.1016/j.cjca.2019.07.519] [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: 11/26/2022] Open
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26
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Bhattacharyya D, Ghosh R, Gupta P, Gupta A, Roychoudhury S, Nath S. Incidence of imatinib resistance in chronic myeloid leukemia (CML) patients: Experience from resource poor center of eastern India. Ann Oncol 2019. [DOI: 10.1093/annonc/mdz251.033] [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: 11/12/2022] Open
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27
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Ganguly R, Kumar S, Nath S, Aswal V. Salt and phytochemical assisted modulation of self-assembly characteristics of Polysorbate-80 in aqueous medium. Int J Pharm 2019; 563:63-70. [DOI: 10.1016/j.ijpharm.2019.03.055] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 03/25/2019] [Accepted: 03/27/2019] [Indexed: 01/19/2023]
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28
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Umare V, Pradhan V, Nath S, Rajadhyaksha A, Ghosh K, Nadkarni AH. Impact of functional IL-18 polymorphisms on genetic predisposition and diverse clinical manifestations of the disease in Indian SLE patients. Lupus 2019; 28:545-554. [PMID: 30857465 DOI: 10.1177/0961203319834677] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Several studies have demonstrated associations between interleukin-18 polymorphisms and risk of systemic lupus erythematosus in different populations except one of Indian origin. We therefore investigated for the influence of interleukin-18 (-1297T/C, -607A/C, -137G/C; + 105A/C) polymorphisms on genetic susceptibility and clinical expression of the disease in Indian systemic lupus erythematosus patients. A total of 200 systemic lupus erythematosus patients and 201 controls were recruited. Genotyping of interleukin-18 polymorphisms were performed by polymerase chain reaction-restriction fragment length polymorphism. Serum interleukin-18 levels were measured by enzyme-linked immunosorbent assay. Interleukin-18 (-1297T/C; -137G/C) polymorphisms showed significant association with genetic susceptibility to the disease in our systemic lupus erythematosus cohort. Stratification analysis revealed -1297CC and -1297C associated with renal involvement (odds ratio = 3.4, correcting p value = 0.0207), (odds ratio = 2.0, correcting p value = 0.0054) respectively. Additionally, -1297C allele frequency was significantly increased in patients with anti-nucleosome antibody (odds ratio = 2.1, correcting p value = 0.0301). Haplotype analysis showed CC haplotype strongly associated with serositis (odds ratio = 9.1, correcting p values = 0.0009) and neurologic involvement (odds ratio = 9.3, correcting p value = 0.0018). We reported a 2.7-fold increase in serum interleukin-18 levels in patients (511.5 ± 242.3 pg/ml) compared to controls (189.4 ± 80.8 pg/ml) ( p < 0.0001). Furthermore, interleukin-18 levels were positively correlated with disease activity ( r = 0.548, p = 0.0001) and renal involvement in the patients with lupus nephritis ( r = 0.569, p < 0.0001). In summary, interleukin-18 polymorphisms elucidated in this study appear to confer genetic susceptibility to the disease and are associated with renal, serositis and neurologic involvement in Indian systemic lupus erythematosus patients.
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Affiliation(s)
- V Umare
- 1 National Institute of Immunohaematology, Indian Council of Medical Research, Mumbai, India
| | - V Pradhan
- 1 National Institute of Immunohaematology, Indian Council of Medical Research, Mumbai, India
| | - S Nath
- 2 Arthritis and Clinical Immunology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, United States of America
| | - A Rajadhyaksha
- 3 Department of Rheumatology, King Edward Memorial Hospital, Mumbai, India
| | - K Ghosh
- 1 National Institute of Immunohaematology, Indian Council of Medical Research, Mumbai, India
| | - A H Nadkarni
- 1 National Institute of Immunohaematology, Indian Council of Medical Research, Mumbai, India
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29
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Azizi Z, Terricabras M, Alipour P, Mallany P, Motamed M, Nath N, Nath S, Forman J, Morris S, Avoulov A, Pantano A, Khaykin Y, Verma A. RISKS OF CONCOMITANT ATRIAL FIBRILLATION WITH IDIOPATHIC VENTRICULAR TACHYCARDIA. Can J Cardiol 2018. [DOI: 10.1016/j.cjca.2018.07.112] [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: 10/28/2022] Open
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30
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Abstract
Mustard oil cake (MOC) is widely used as biofertilizer in the field of agriculture and aquaculture. Channa punctatus was exposed to 0.42 g.L-1 sublethal concentration for 4, 7, 14, 21 and 28 days. Due to such exposure, body growth and histological changes in liver were observed. It was revealed that weight, length and breadth of fish were gradually increased with the days of exposure in compare to control fish, whereas, liver showed an increase in sinusoidal space and lipidosis during early days, followed by a recovery from the stress of MOC on the 28th day.
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Affiliation(s)
- S Nath
- a Government G. D. College , Singur , India
| | - V Matozzo
- b Department of Biology , University of Padova , Padova , Italy
| | - D Bhandari
- c Bidhannagar CollegePost Graduate Department of Zoology , Kolkata , India
| | - C Faggio
- d Department of Chemical, Biological, Pharmaceutical and Environmental Sciences , University of Messina , Messina , Italy
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31
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Roychoudhury S, Halenar M, Tupa V, Michalcova K, Nath S, Kacaniova M, Kolesarova A. Ovarian steroid hormone secretion activity examined after supplementation of green tea extract. Physiol Res 2017; 66:1057-1059. [PMID: 29261327 DOI: 10.33549/physiolres.933685] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
This study aimed at examining the secretion activity of steroid hormones progesterone and 17beta-estradiol by porcine ovarian granulosa cells after addition of green tea extract. Granulosa cells were incubated with green tea extract (at doses of 0.01, 0.1, 1, 10 and 100 microg.ml(-1). Another set of cells were incubated with green tea extract at the above doses along with additional supplementation of follicle stimulating hormone (FSH) at 10 microg.ml(-1). Release of hormones by granulosa cells was assessed by EIA after 24 h exposure. Secretion of steroid hormones was not affected either by green tea extract alone or after FSH supplementation with green tea extract. Results indicate that ovarian steroidogenesis is not affected by green tea under conditions used in the experiment.
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Affiliation(s)
- S Roychoudhury
- Department of Life Science and Bioinformatics, Assam University, Silchar, India, Department of Animal Physiology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic.
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32
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Khushboo, Mandal S, Madhavan N, Muralithar S, Das JJ, Nath S, Jhingan A, Gehlot J, Behera B, Verma S, Singh H, Kalkal S, Singh R. Influence of neutron transfer channels on fusion enhancement in sub-barrier region. EPJ Web Conf 2017. [DOI: 10.1051/epjconf/201716300029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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33
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Sarma K, Roychoudhury S, Bora SS, Dehury B, Parida P, Das S, Das R, Dohutia C, Nath S, Deb B, Modi MK. Molecular Modeling and Dynamics Simulation Analysis of KATNAL1 for Identification of Novel Inhibitor of Sperm Maturation. Comb Chem High Throughput Screen 2017; 20:82-92. [PMID: 28093975 DOI: 10.2174/1386207320666170116120104] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 12/29/2016] [Accepted: 01/06/2017] [Indexed: 11/22/2022]
Abstract
BACKGROUND Hormone based birth control often causes various side effects. A recent study revealed that temporary infertility without changing hormone levels can be attained by inhibiting Katanin p60 ATPase-containing subunit A-like 1 protein (KATNAL1) which is critical for sperm maturation in the testes. OBJECTIVE This study aimed at attaining the most energetically stable three dimensional (3D) structure of KATNAL1 protein using comparative modeling followed by screening of a ligand library of known natural spermicidal compounds for their binding affinity with KATNAL1. This in turn may inhibit the development of mature sperm in the seminiferous epithelium. METHOD A series of computational techniques were used for building the 3D structure of KATNAL1 which was further optimized by molecular dynamics (MD) simulation. For revealing the ATP binding mode of KATNAL1, docking study was carried out using the optimized model obtained from the MD simulation. The docking study was also employed to test the binding efficiency of the ligand library. RESULTS Molecular docking study confirmed the ATP binding of KATNAL1 with various hydrophobic and hydrogen bond interactions. Binding efficiency of the ligand library suggested that calotropin, a cardenolide of Calotropis procera showed the highest binding efficiency against the target protein without toxicity. MD simulation of the docked complex validated the results of the docking study. CONCLUSION This study revealed the ATP binding mode of KATNAL1 and identified calotropin as a potential lead molecule against it showing high binding efficiency with good bioavailability and no mutagenicity. Further in vitro and in vivo bioassay of calotropin could facilitate the development of novel non-hormonal male-specific contraceptive in near future.
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Affiliation(s)
- Kishore Sarma
- Department of Life Science and Bioinformatics, Assam University, Silchar 788011, Assam. India
| | - Shubhadeep Roychoudhury
- Department of Life Science and Bioinformatics, Assam University, Silchar 788011, Assam. India
| | - Sudipta Sankar Bora
- Centre for Studies in Biotechnology, Dibrugarh University, Dibrugarh 786004, Assam. India
| | - Budheswar Dehury
- Department of Life Science and Bioinformatics, Assam University, Silchar 788011, Assam. India
| | - Pratap Parida
- Centre for Studies in Biotechnology, Dibrugarh University, Dibrugarh 786004, Assam. India
| | - Saurav Das
- Centre for Studies in Biotechnology, Dibrugarh University, Dibrugarh 786004, Assam. India
| | - Robin Das
- Centre for Bioinformatics Studies, Dibrugarh University, Dibrugarh 786004, Assam. India
| | - Chandrajit Dohutia
- Department of Pharmaceutical Sciences, Dibrugarh University, Dibrugarh 786004, Assam. India
| | - Sangeeta Nath
- Department of Life Science and Bioinformatics, Assam University, Silchar 788011, Assam. India
| | - Bibhas Deb
- Bioinformatics Centre, Guru Charan College, Silchar 788 004, Assam. India
| | - Mahendra K Modi
- Distributed Information Centre, Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat 785013, Assam. India
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Sandin L, Bergkvist L, Nath S, Kielkopf C, Janefjord C, Helmfors L, Zetterberg H, Blennow K, Li H, Nilsberth C, Garner B, Brorsson AC, Kågedal K. Beneficial effects of increased lysozyme levels in Alzheimer's disease modelled in Drosophila melanogaster. FEBS J 2017; 283:3508-3522. [PMID: 27562772 PMCID: PMC5132093 DOI: 10.1111/febs.13830] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 06/18/2016] [Accepted: 08/03/2016] [Indexed: 01/23/2023]
Abstract
Genetic polymorphisms of immune genes that associate with higher risk to develop Alzheimer's disease (AD) have led to an increased research interest on the involvement of the immune system in AD pathogenesis. A link between amyloid pathology and immune gene expression was suggested in a genome‐wide gene expression study of transgenic amyloid mouse models. In this study, the gene expression of lysozyme, a major player in the innate immune system, was found to be increased in a comparable pattern as the amyloid pathology developed in transgenic mouse models of AD. A similar pattern was seen at protein levels of lysozyme in human AD brain and CSF, but this lysozyme pattern was not seen in a tau transgenic mouse model. Lysozyme was demonstrated to be beneficial for different Drosophila melanogaster models of AD. In flies that expressed Aβ1‐42 or AβPP together with BACE1 in the eyes, the rough eye phenotype indicative of toxicity was completely rescued by coexpression of lysozyme. In Drosophila flies bearing the Aβ1‐42 variant with the Arctic gene mutation, lysozyme increased the fly survival and decreased locomotor dysfunction dose dependently. An interaction between lysozyme and Aβ1‐42 in the Drosophila eye was discovered. We propose that the increased levels of lysozyme, seen in mouse models of AD and in human AD cases, were triggered by Aβ1‐42 and caused a beneficial effect by binding of lysozyme to toxic species of Aβ1‐42, which prevented these from exerting their toxic effects. These results emphasize the possibility of lysozyme as biomarker and therapeutic target for AD.
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Affiliation(s)
- Linnea Sandin
- Division of Cell Biology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, Sweden
| | - Liza Bergkvist
- Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Sweden
| | - Sangeeta Nath
- Division of Cell Biology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, Sweden
| | - Claudia Kielkopf
- Division of Cell Biology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, Sweden
| | - Camilla Janefjord
- Division of Cell Biology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, Sweden
| | - Linda Helmfors
- Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Sweden
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Department of Neuroscience and Physiology, Sahlgrenska University Hospital, Mölndal, Sweden.,UCL Institute of Neurology, London, UK
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Department of Neuroscience and Physiology, Sahlgrenska University Hospital, Mölndal, Sweden
| | - Hongyun Li
- Illawarra Health and Medical Research Institute, University of Wollongong, Australia
| | - Camilla Nilsberth
- Department of Acute Internal Medicine and Geriatrics and Department of Clinical and Experimental Medicine, Linköping University, Sweden
| | - Brett Garner
- Illawarra Health and Medical Research Institute, University of Wollongong, Australia.,School of Biological Sciences, University of Wollongong, Australia
| | - Ann-Christin Brorsson
- Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, Sweden.
| | - Katarina Kågedal
- Division of Cell Biology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, Sweden.
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35
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Singhal D, Wee L, Babic M, Parker W, Moore S, Feng J, Schreiber A, Geoghegan J, Kutyna M, Chhetri R, Nath S, Singhal N, Gowda R, Ross D, To L, D’Andrea R, Lewis I, Hahn C, Scott H, Hiwase D. Therapy Related Myeloid Neoplasms (T-MN) Show High Mutation Frequency and a Spectrum Different from Primary MDS. Leuk Res 2017. [DOI: 10.1016/s0145-2126(17)30389-2] [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: 11/16/2022]
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36
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Singhal D, Chhetri R, Wee L, Kutyna M, Nath S, Hiwase D. Iron Chelation Therapy is Associated with Improved Survival in Lower Risk MDS. Leuk Res 2017. [DOI: 10.1016/s0145-2126(17)30399-5] [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: 11/30/2022]
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37
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Shewade HD, Chadha SS, Gupta V, Tripathy JP, Satyanarayana S, Sagili K, Mohanty S, Bera OP, Pandey P, Rajeswaran P, Jayaraman G, Santhappan A, Bajpai UN, Mamatha AM, Maiser R, Naqvi AJ, Pandurangan S, Nath S, Ghule VH, Das A, Prasad BM, Biswas M, Singh G, Mallick G, Jeyakumar Jaisingh AJ, Rao R, Kumar AMV. Data collection using open access technology in multicentre operational research involving patient interviews. Public Health Action 2017; 7:74-77. [PMID: 28744430 DOI: 10.5588/pha.15.0079] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [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: 09/19/2016] [Accepted: 11/19/2016] [Indexed: 11/10/2022] Open
Abstract
Conducting multicentre operational research is challenging due to issues related to the logistics of travel, training, supervision, monitoring and troubleshooting support. This is even more burdensome in resource-constrained settings and if the research includes patient interviews. In this article, we describe an innovative model that uses open access tools such as Dropbox, TeamViewer and CamScanner for efficient, quality-assured data collection in an ongoing multicentre operational research study involving record review and patient interviews. The tools used for data collection have been shared for adaptation and use by other researchers.
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Affiliation(s)
| | - H D Shewade
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - S S Chadha
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - V Gupta
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India.,All India Institute of Medical Sciences, New Delhi, India
| | - J P Tripathy
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - S Satyanarayana
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - K Sagili
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - S Mohanty
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - O P Bera
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - P Pandey
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - P Rajeswaran
- Resource Group for Education and Advocacy for Community Health, Chennai, India
| | - G Jayaraman
- Resource Group for Education and Advocacy for Community Health, Chennai, India
| | - A Santhappan
- Catholic Health Association of India, Secunderabad, India
| | - U N Bajpai
- Voluntary Health Association of India, New Delhi, India
| | - A M Mamatha
- Catholic Health Association of India, Secunderabad, India
| | - R Maiser
- Catholic Health Association of India, Secunderabad, India
| | - A J Naqvi
- MAMTA Health Institute for Mother and Child, New Delhi, India
| | - S Pandurangan
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - S Nath
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - V H Ghule
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - A Das
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - B M Prasad
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - M Biswas
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - G Singh
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | - G Mallick
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India
| | | | - R Rao
- Central TB Division, Revised National Tuberculosis Control Programme, Ministry of Health and Family Welfare, New Delhi, India
| | - A M V Kumar
- International Union Against Tuberculosis and Lung Disease (The Union), South-East Asia Office, New Delhi, India.,The Union, Paris, France
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Eriksson I, Nath S, Bornefall P, Giraldo AMV, Öllinger K. Impact of high cholesterol in a Parkinson's disease model: Prevention of lysosomal leakage versus stimulation of α-synuclein aggregation. Eur J Cell Biol 2017; 96:99-109. [PMID: 28109635 DOI: 10.1016/j.ejcb.2017.01.002] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [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: 05/25/2016] [Accepted: 01/04/2017] [Indexed: 12/17/2022] Open
Abstract
Parkinson's disease is characterized by accumulation of intraneuronal cytoplasmic inclusions, Lewy bodies, which mainly consist of aggregated α-synuclein. Controversies exist as to whether high blood cholesterol is a risk factor for the development of the disease and whether statin treatment could have a protective effect. Using a model system of BE(2)-M17 neuroblastoma cells treated with the neurotoxin 1-methyl-4-phenylpyridinium (MPP+), we found that MPP+-induced cell death was accompanied by cholesterol accumulation in a lysosomal-like pattern in pre-apoptotic cells. To study the effects of lysosomal cholesterol accumulation, we increased lysosomal cholesterol through pre-treatment with U18666A and found delayed leakage of lysosomal contents into the cytosol, which reduced cell death. This suggests that increased lysosomal cholesterol is a stress response mechanism to protect lysosomal membrane integrity in response to early apoptotic stress. However, high cholesterol also stimulated the accumulation of α-synuclein. Treatment with the cholesterol-lowering drug lovastatin reduced MPP+-induced cell death by inhibiting the production of reactive oxygen species, but did not prevent lysosomal cholesterol increase nor affect α-synuclein accumulation. Our study indicates a dual role of high cholesterol in Parkinson's disease, in which it acts both as a protector against lysosomal membrane permeabilization and as a stimulator of α-synuclein accumulation.
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Affiliation(s)
- Ida Eriksson
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
| | - Sangeeta Nath
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
| | - Per Bornefall
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
| | - Ana Maria Villamil Giraldo
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
| | - Karin Öllinger
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Health Sciences, Linköping University, Linköping, Sweden.
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Katuri RN, Das G, Singh AK, Chalhotra SK, Nath S. Comparative efficacy of deltamethrin and chlorpyriphos in bovine ticks in and around Jabalpur. J Parasit Dis 2016; 41:713-715. [PMID: 28848265 DOI: 10.1007/s12639-016-0872-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 10/18/2016] [Accepted: 12/15/2016] [Indexed: 11/26/2022] Open
Abstract
Efficacy of chlorpyriphos (Classic*20, 20% EC) and deltamethrin (Butox®, 1.25% EC) was assessed by spraying these drugs on cattle and buffaloes which were naturally infested with ticks at the concentration of 2.5 and 2 ml/l, respectively. Results of the study demonstrated the prolonged effect of chlorpyriphos when compared with deltamethrin. Moreover, residual effect of chlorpyriphos remained even after 14 days of treatment with 28.57% animals showing reinfestation, while in deltamethrin treated animals; the tick number started increasing after 14th day of treatment with 50% animals showing reinfestation on 14th day post-treatment.
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Affiliation(s)
- R N Katuri
- Department of Veterinary Parasitology, College of Veterinary Science and Animal Husbandry, Nanaji Deshmukh Veterinary Science University, Jabalpur, Madhya Pradesh India
| | - G Das
- Department of Veterinary Parasitology, College of Veterinary Science and Animal Husbandry, Nanaji Deshmukh Veterinary Science University, Jabalpur, Madhya Pradesh India
| | - A K Singh
- Department of Veterinary Parasitology, College of Veterinary Science and Animal Husbandry, Nanaji Deshmukh Veterinary Science University, Jabalpur, Madhya Pradesh India
| | - S K Chalhotra
- Department of Veterinary Parasitology, College of Veterinary Science and Animal Husbandry, Nanaji Deshmukh Veterinary Science University, Jabalpur, Madhya Pradesh India
| | - S Nath
- Department of Veterinary Parasitology, College of Veterinary Science and Animal Husbandry, Nanaji Deshmukh Veterinary Science University, Jabalpur, Madhya Pradesh India
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Saikia K, Bhattacharyya J, Nath S. Prevalence and clinical significance of AML1-ETO t(8;21)(q22;q22) in acute myeloid leukaemia patients of Assam. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32710-1] [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: 11/17/2022]
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Hazarika R, Choudhury D, Nath S, Parua S. Estimation of Skin to Subarachnoid Space Depth: An Observational Study. J Clin Diagn Res 2016; 10:UC06-UC09. [PMID: 27891425 DOI: 10.7860/jcdr/2016/21679.8755] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 05/27/2016] [Accepted: 07/18/2016] [Indexed: 11/24/2022]
Abstract
INTRODUCTION In a patient, the skin to Subarachnoid Space Depth (SSD) varies considerably at different levels of the spinal cord. It also varies from patient to patient at the same vertebral level as per age, sex and Body Mass Index (BMI). Estimation of the skin to SSD reduces complications related to spinal anaesthesia. AIM To measure the skin to SSD in the Indian population and to find a formula for predicting this depth. MATERIALS AND METHODS Three hundred adult patients belonging to American Society of Anaesthesiologist class I and II, undergoing surgery using spinal anaesthesia in various surgical specialities of Gauhati Medical College were selected by systemic sampling for this prospective, observational study. Patients were divided into three groups: Group M containing male patients, Group F containing non-pregnant female patients, and Group PF containing pregnant female's patients. SSD was measured after performing lumbar puncture. The relationship between SSD and patient characteristics were studied, correlated and statistical analysis was used to find a formula for predicting the skin to SSD. Statistical analysis was done using Statistical Package for Social Sciences (SPSS 21.0, Chicago, IL, USA). One-way ANOVA with post-hoc(Bonferroni correction factor) analysis was applied to compare the three groups. Multivariate analysis was done for the covariates followed by a multivariate regression analysis to evaluate the covariates influencing SSD for each group separately. RESULTS Mean SSD was 4.37±0.31cm in the overall population. SSD in adult males was 4.49±0.19cm which was significantly longer than that observed in female's 4.18±0.39cm which was comparable with SSD in parturient 4.43±0.19 cm. The formula for predicting the skin to SSD in the male population was 1.718+0.077×BMI+0.632×Height, in nonpregnant female population was 1.828+0.077×BMI+0.018×Height+0.007×Age and 0.748+0.209×BMI+4.703×Height-0.054×weight in parturient females, respectively. CONCLUSION Skin to SSD correlated with the BMI in all the patients in our study.
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Affiliation(s)
- Rajib Hazarika
- Associate Professor, Department of Anaesthesiology and Critical Care, Gauhati Medical College and Hospital , Guwahati, Assam, India
| | - Dipika Choudhury
- Professor and Head of the Department, Department of Anaesthesiology and Critical Care, Gauhati Medical College and Hospital , Guwahati, Assam, India
| | - Sangeeta Nath
- Post Graduate Trainee, Department of Anaesthesiology and Critical Care, Gauhati Medical College and Hospital , Guwahati, Assam, India
| | - Samit Parua
- Post Graduate Trainee, Department of Anaesthesiology and Critical Care, Gauhati Medical College and Hospital , Guwahati, Assam, India
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Talukdar M, Bordoloi M, Dutta P, Saikia S, Kolita B, Talukdar S, Nath S, Yadav A, Saikia R, Jha D, Bora T. Structure elucidation and biological activity of antibacterial compound from Micromonospora auratinigra
, a soil Actinomycetes. J Appl Microbiol 2016; 121:973-87. [DOI: 10.1111/jam.13233] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 05/20/2016] [Accepted: 07/04/2016] [Indexed: 11/28/2022]
Affiliation(s)
- M. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - M. Bordoloi
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - P.P. Dutta
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Saikia
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - B. Kolita
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Talukdar
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - S. Nath
- Natural Product Chemistry Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - A. Yadav
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - R. Saikia
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
| | - D.K. Jha
- Microbial Ecology Laboratory; Department of Botany; Gauhati University; Guwahati Assam India
| | - T.C. Bora
- Biotechnology Division; CSIR-North East Institute of Science and Technology; Jorhat Assam India
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Tsementzi D, Wu J, Deutsch S, Nath S, Rodriguez-R LM, Burns AS, Ranjan P, Sarode N, Malmstrom RR, Padilla CC, Stone BK, Bristow LA, Larsen M, Glass JB, Thamdrup B, Woyke T, Konstantinidis KT, Stewart FJ. SAR11 bacteria linked to ocean anoxia and nitrogen loss. Nature 2016; 536:179-83. [PMID: 27487207 PMCID: PMC4990128 DOI: 10.1038/nature19068] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 06/30/2016] [Indexed: 01/25/2023]
Abstract
Bacteria of the SAR11 clade constitute up to one half of all microbial cells in the oxygen-rich surface ocean. SAR11 bacteria are also abundant in oxygen minimum zones (OMZs), where oxygen falls below detection and anaerobic microbes have vital roles in converting bioavailable nitrogen to N2 gas. Anaerobic metabolism has not yet been observed in SAR11, and it remains unknown how these bacteria contribute to OMZ biogeochemical cycling. Here, genomic analysis of single cells from the world's largest OMZ revealed previously uncharacterized SAR11 lineages with adaptations for life without oxygen, including genes for respiratory nitrate reductases (Nar). SAR11 nar genes were experimentally verified to encode proteins catalysing the nitrite-producing first step of denitrification and constituted ~40% of OMZ nar transcripts, with transcription peaking in the anoxic zone of maximum nitrate reduction activity. These results link SAR11 to pathways of ocean nitrogen loss, redefining the ecological niche of Earth's most abundant organismal group.
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Abstract
The objective of this paper is to investigate the extent of public expenditure decentralization among developing countries, and to identify its determinants. Using data compiled from international agency sources, and from primary sources, it is shown that fiscal decentralization has gone significantly farther in developed than in developing countries. The use of factor analysis and regression analysis indicates three general explanations for the wide variation in fiscal decentralization among countries. The public expenditure share of subnational governments appears to be greater where the level of economic development is higher, in countries with larger populations, and in countries whose central government budgets carry less of a defense burden. The results also suggest that where central governments mobilize more resources through the revenue system, the subnational government's share of expenditures may be lower—taxes are more likely to stick where they hit than to be passed through as grants to local governments.
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Affiliation(s)
- R W Bahl
- Metropolitan Studies Program, The Maxwell School, Syracuse University, Syracuse, NY 13244-1090, USA
| | - S Nath
- National Institute of Public Finance and Policy, 18/2 Satsang Vihar Marg, Special Institutional Area, New Delhi, 110 067, India
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Shah T, Patel M, Nath S, Menon SK. Determination of sex using cephalo-facial dimensions by discriminant function and logistic regression equations. Egyptian Journal of Forensic Sciences 2016. [DOI: 10.1016/j.ejfs.2015.03.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Nath S, Russell G, Kuyken W, Psychogiou L, Ford T. Does father-child conflict mediate the association between fathers' postnatal depressive symptoms and children's adjustment problems at 7 years old? Psychol Med 2016; 46:1719-1733. [PMID: 26965923 DOI: 10.1017/s0033291716000234] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
BACKGROUND Paternal depressive symptoms are associated with children's emotional and behavioural problems, which may be mediated by negative parenting. But there is no research on the influence of paternal depressive symptoms on children's emotion regulation and limited literature investigating fathers' parenting as a mediator in the pathway between paternal depressive symptoms and children's externalizing and internalizing problems. We aimed to investigate the mediating role of father-child conflict (at 3 years) in the association between postnatal paternal depressive symptoms (at 9 months) and children's emotional and behavioural problems (at 7 years) (aim 1). We also examined whether mediation pathways were more pronounced for boys or for girls (aim 2). METHOD Secondary data analysis was conducted on the Millennium Cohort Study, when children were 9 months, 3 years and 7 years old (n = 3520). Main study variables were measured by self-report questionnaires. Fathers completed the Rutter Scale (depressive symptoms) and the Parent-Child Relationship Questionnaire (father-child conflict), while mothers completed the Strengths and Difficulties Questionnaire and the Social Behaviour Questionnaire (child emotional and behavioural problems, emotion regulation). We used structural equation modelling to estimate direct, indirect and total effects of paternal depressive symptoms on child outcomes, mediated by father-child conflict whilst adjusting for relevant covariates (maternal depressive symptoms, child temperament, marital conflict, and socio-economic factors such as poverty indicator and fathers' education level). Multi-group and interaction analysis was then conducted to determine the differential effect by gender of the association between paternal depressive symptoms on child outcomes via father-child conflict. RESULTS Father-child conflict mediated the association between paternal depressive symptoms and emotion regulation problems [standardized indirect effect (SIE) 95% confidence interval (CI) -0.03 to -0.01, p < 0.001; standardized total effect (STE) 95% CI -0.05 to -0.01, p < 0.05] (aim 1). Father-child conflict mediated a larger proportion of the effect in boys (SIE 95% CI -0.03 to -0.01, p < 0.001; STE 95% CI -0.05 to 0.00, p = 0.063) than it did in girls (SIE 95% CI -0.02 to -0.01, p < 0.001; STE 95% CI -0.04 to 0.01, p = 0.216) (aim 2). CONCLUSIONS Father-child conflict may mediate the association between postnatal paternal depressive symptoms and children's emotion regulation problems. Paternal depressive symptoms and father-child conflict resolution may be potential targets in preventative interventions.
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Affiliation(s)
- S Nath
- Mood Disorders Centre,University of Exeter,Exeter,UK
| | - G Russell
- Institute of Health Research,University of Exeter Medical School,Exeter,UK
| | - W Kuyken
- University Department of Psychiatry,University of Oxford,Warneford Hospital,Oxford,UK
| | - L Psychogiou
- Mood Disorders Centre,University of Exeter,Exeter,UK
| | - T Ford
- Institute of Health Research,University of Exeter Medical School,Exeter,UK
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Evans MK, Sauer SJ, Nath S, Robinson TJ, Morse MA, Devi GR. X-linked inhibitor of apoptosis protein mediates tumor cell resistance to antibody-dependent cellular cytotoxicity. Cell Death Dis 2016; 7:e2073. [PMID: 26821068 PMCID: PMC4816185 DOI: 10.1038/cddis.2015.412] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 12/15/2015] [Accepted: 12/17/2015] [Indexed: 01/29/2023]
Abstract
Inflammatory breast cancer (IBC) is the deadliest, distinct subtype of breast cancer. High expression of epidermal growth factor receptors [EGFR or human epidermal growth factor receptor 2 (HER2)] in IBC tumors has prompted trials of anti-EGFR/HER2 monoclonal antibodies to inhibit oncogenic signaling; however, de novo and acquired therapeutic resistance is common. Another critical function of these antibodies is to mediate antibody-dependent cellular cytotoxicity (ADCC), which enables immune effector cells to engage tumors and deliver granzymes, activating executioner caspases. We hypothesized that high expression of anti-apoptotic molecules in tumors would render them resistant to ADCC. Herein, we demonstrate that the most potent caspase inhibitor, X-linked inhibitor of apoptosis protein (XIAP), overexpressed in IBC, drives resistance to ADCC mediated by cetuximab (anti-EGFR) and trastuzumab (anti-HER2). Overexpression of XIAP in parental IBC cell lines enhances resistance to ADCC; conversely, targeted downregulation of XIAP in ADCC-resistant IBC cells renders them sensitive. As hypothesized, this ADCC resistance is in part a result of the ability of XIAP to inhibit caspase activity; however, we also unexpectedly found that resistance was dependent on XIAP-mediated, caspase-independent suppression of reactive oxygen species (ROS) accumulation, which otherwise occurs during ADCC. Transcriptome analysis supported these observations by revealing modulation of genes involved in immunosuppression and oxidative stress response in XIAP-overexpressing, ADCC-resistant cells. We conclude that XIAP is a critical modulator of ADCC responsiveness, operating through both caspase-dependent and -independent mechanisms. These results suggest that strategies targeting the effects of XIAP on caspase activation and ROS suppression have the potential to enhance the activity of monoclonal antibody-based immunotherapy.
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Affiliation(s)
- M K Evans
- Division of Surgical Sciences, Department of Surgery, Duke University Medical Center, Durham, NC, USA.,Department of Pathology, Duke University Medical Center, Durham, NC, USA
| | - S J Sauer
- Division of Surgical Sciences, Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | - S Nath
- Division of Surgical Sciences, Department of Surgery, Duke University Medical Center, Durham, NC, USA
| | - T J Robinson
- Department of Radiation Oncology, Duke University Medical Center, Durham, NC, USA
| | - M A Morse
- Department of Medicine, Duke University Medical Center, Durham, NC, USA.,Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA
| | - G R Devi
- Division of Surgical Sciences, Department of Surgery, Duke University Medical Center, Durham, NC, USA.,Department of Pathology, Duke University Medical Center, Durham, NC, USA.,Duke Cancer Institute, Duke University Medical Center, Durham, NC, USA
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Kaur M, Behera B, Singh G, Singh V, Madhavan N, Muralithar S, Nath S, Gehlot J, Mohanto G, Mukul I, Siwal D, Thakur M, Kapoor K, Sharma P, Banerjee T, Jhingan A, Varughese T, Bala I, Nayak B, Saxena A, Chatterjee M, Stevenson P. Probing dynamics of fusion reactions through cross-section and spin distribution measurement. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708026] [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: 11/15/2022] Open
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Helmfors L, Boman A, Civitelli L, Nath S, Sandin L, Janefjord C, McCann H, Zetterberg H, Blennow K, Halliday G, Brorsson AC, Kågedal K. Protective properties of lysozyme on β-amyloid pathology: implications for Alzheimer disease. Neurobiol Dis 2015; 83:122-33. [PMID: 26334479 DOI: 10.1016/j.nbd.2015.08.024] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [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: 06/14/2015] [Revised: 08/03/2015] [Accepted: 08/21/2015] [Indexed: 01/24/2023] Open
Abstract
The hallmarks of Alzheimer disease are amyloid-β plaques and neurofibrillary tangles accompanied by signs of neuroinflammation. Lysozyme is a major player in the innate immune system and has recently been shown to prevent the aggregation of amyloid-β1-40 in vitro. In this study we found that patients with Alzheimer disease have increased lysozyme levels in the cerebrospinal fluid and lysozyme co-localized with amyloid-β in plaques. In Drosophila neuronal co-expression of lysozyme and amyloid-β1-42 reduced the formation of soluble and insoluble amyloid-β species, prolonged survival and improved the activity of amyloid-β1-42 transgenic flies. This suggests that lysozyme levels rise in Alzheimer disease as a compensatory response to amyloid-β increases and aggregation. In support of this, in vitro aggregation assays revealed that lysozyme associates with amyloid-β1-42 and alters its aggregation pathway to counteract the formation of toxic amyloid-β species. Overall, these studies establish a protective role for lysozyme against amyloid-β associated toxicities and identify increased lysozyme in patients with Alzheimer disease. Therefore, lysozyme has potential as a new biomarker as well as a therapeutic target for Alzheimer disease.
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Affiliation(s)
- Linda Helmfors
- Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden
| | - Andrea Boman
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Livia Civitelli
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Sangeeta Nath
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Linnea Sandin
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Camilla Janefjord
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden
| | - Heather McCann
- Neuroscience Research Australia and University of New South Wales, Randwick New South Wales 2031, Australia
| | - Henrik Zetterberg
- Clinical Neurochemistry Laboratory, Department of Neuroscience and Physiology, Sahlgrenska University Hospital, 431 30 Mölndal, Sweden; UCL Institute of Neurology, Queen Square, London WC1N 3BG, United Kingdom
| | - Kaj Blennow
- Clinical Neurochemistry Laboratory, Department of Neuroscience and Physiology, Sahlgrenska University Hospital, 431 30 Mölndal, Sweden
| | - Glenda Halliday
- Neuroscience Research Australia and University of New South Wales, Randwick New South Wales 2031, Australia
| | - Ann-Christin Brorsson
- Division of Molecular Biotechnology, Department of Physics, Chemistry and Biology, Linköping University, 581 83 Linköping, Sweden.
| | - Katarina Kågedal
- Experimental Pathology, Department of Clinical and Experimental Medicine, Faculty of Medicine and Health Sciences, Linköping University, 581 85 Linköping, Sweden.
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Abstract
BACKGROUND Curcumin has anti-inflammatory properties. The aim of this study was to compare interleukin-1β (IL-1β) and chemokine (C-C motif) ligand 28 (CCL28) levels following a topical application of curcumin (CRM), chlorhexidine (CHX) and chlorhexidine-metronidazole (CHX-MTZ) in an experimental gingivitis human model. METHODS Sixty systemically healthy selected subjects were randomly assigned to one of three topical antigingivitis gels. Each gel was applied twice daily for 10 minutes as the sole method of oral hygiene for 29 days on the test quadrant only. Modified gingival index (MGI), plaque index (PI), bleeding on probing (BOP) and probing depth (PD) were assessed at baseline, 29 days and 60 days. Estimation of IL-1β and CCL28 levels in gingival crevicular fluid was done at baseline and at 29 days. RESULTS The increase of IL-1β in the CRM (14.52 ± 16.6 pg/ml) and CHX-MTZ (31.63 ± 15.96) groups was significantly less than that of the CHX group (70.55 ± 38.81). Similar results were also observed for CCL28 (CRM: 8.12 ± 8.78 pg/ml; CHX-MTZ: 12.81 ± 18.68; CHX: 41.15 ± 22.82). All groups had a significant increase in MGI, PI and BOP at 29 days. CONCLUSIONS The anti-inflammatory potential of topical curcumin was similar to CHX-MTZ but superior to CHX in affecting IL-1β and CCL28 levels.
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Affiliation(s)
- S J Pulikkotil
- Department of Restorative Dentistry, School of Dentistry, International Medical University, Kuala Lumpur, Malaysia
| | - S Nath
- Department of Periodontology, Vananchal Dental College and Hospital, Garhwa, Jharkhand, India
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