26
|
Mondal RK, Khatun M, Ghosh S, Banerjee P, Datta S, Sarkar S, Saha B, Santra A, Banerjee S, Chowdhury A, Datta S. Immune-driven adaptation of hepatitis B virus genotype D involves preferential alteration in B-cell epitopes and replicative attenuation--an insight from human immunodeficiency virus/hepatitis B virus coinfection. Clin Microbiol Infect 2015; 21:710.e11-20. [PMID: 25882358 DOI: 10.1016/j.cmi.2015.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2014] [Revised: 02/25/2015] [Accepted: 03/13/2015] [Indexed: 12/30/2022]
Abstract
An important driving force behind the sequence diversity of hepatitis B virus (HBV) is viral adaptation to host immune responses. To gain an insight into the impact of host immunity on genetic diversification and properties of HBV, we characterized HBV of genotype D from treatment-naive hepatitis B e antigen-positive (EP) and hepatitis B e antigen-negative (EN) patients with chronic hepatitis B (CHB), where HBV is under stronger immune pressure, with that of HBV derived from human immunodeficiency virus (HIV)/HBV-coinfected individuals, where HIV infection has significantly weakened the immune system. Full-length sequence analysis showed that HBV heterogeneity was most extensive in EN-CHB followed by EP-CHB and HIV/HBV coinfection. The relative magnitude of non-synonymous changes within B-cell epitopes was greater than that in T-cell epitopes of HBV open reading frames (ORFs) in both EP-CHB and EN-CHB. Nine amino acid substitutions were identified in B-cell epitopes and one in a T-cell epitope of HBV in EN-CHB, most of which resulted in altered hydrophobicities, as determined using the Kyte and Doolittle method, relative to wild-type residues found in HBV from the HIV-positive group. Additionally, 19 substitutions occurred at significantly higher frequencies in non-epitope regions of HBV ORF-P in EN-CHB than HIV/HBV-coinfected patients. In vitro replication assay demonstrated that the substitutions, particularly in reverse transcriptase and RNaseH domains of ORF-P, resulted in a decline in replication capacity of HBV. Hence, our results indicate that HBV adapts to increasing immune pressure through preferential mutations in B-cell epitopes and by replicative attenuation. The viral epitopes linked to immune response identified in this study bear important implications for future HBV vaccine studies.
Collapse
|
27
|
Debnath A, Thapa R, Chattopadhyay KK, Saha B. Spectroscopic Studies on Interaction of Congo Red with Ferric Chloride in Aqueous Medium for Wastewater Treatment. SEP SCI TECHNOL 2015. [DOI: 10.1080/01496395.2014.978474] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
|
28
|
Jana SK, Saha B, Satpati B, Banerjee S. Structural and electrochemical analysis of a novel co-electrodeposited Mn2O3–Au nanocomposite thin film. Dalton Trans 2015; 44:9158-69. [DOI: 10.1039/c5dt01025j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this work we report the fabrication of both pristine Mn2O3 and Mn2O3–Au composite thin films on an indium tin oxide (ITO) substrate by a one-step novel co-electrodeposition technique.
Collapse
|
29
|
Mohammed ML, Mbeleck R, Saha B. Efficient and selective molybdenum based heterogeneous catalyst for alkene epoxidation using batch and continuous reactors. Polym Chem 2015. [DOI: 10.1039/c5py01147g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A polystyrene 2-(aminomethyl)pyridine supported molybdenum(vi) complex (Ps·AMP·Mo) has been prepared, characterised and used as a catalyst for epoxidation of 1-hexene and 4-vinyl-1-cyclohexene (4-VCH) using TBHP as an oxidant.
Collapse
|
30
|
Lie J, Beswick K, Saha B, Veerappan C, Watt T. Cytological detection of fat globules after embolism. Anaesthesia 2014; 69:1406-7. [DOI: 10.1111/anae.12928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
31
|
Chandel HS, Pandey SP, Shukla D, Lalsare K, Selvaraj SK, Jha MK, Saha B. Toll-like receptors and CD40 modulate each other's expression affecting Leishmania major infection. Clin Exp Immunol 2014; 176:283-90. [PMID: 24387292 DOI: 10.1111/cei.12264] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/27/2013] [Indexed: 11/27/2022] Open
Abstract
Toll-like receptors (TLRs) recognize pathogen-associated molecular patterns and results in innate immune system activation that results in elicitation of the adaptive immune response. One crucial modulator of the adaptive immune response is CD40. However, whether these molecules influence each other's expression and functions is not known. Therefore, we examined the effects of TLRs on CD40 expression on macrophages, the host cell for the protozoan parasite Leishmania major. While polyinosinic-polycytidylic acid [poly (I:C)], a TLR-3 ligand, lipopolysaccharide (LPS), a TLR-4 ligand, imiquimod, a TLR-7/8 ligand and cytosine-phosphate-guanosine (CpG), a TLR-9 ligand, were shown to enhance CD40 expression, CD40 stimulation enhanced only TLR-9 expression. Therefore, we tested the synergism between CD40 and CpG in anti-leishmanial immune response. In Leishmania-infected macrophages, CpG was found to reduce CD40-induced extracellular stress-regulated kinase (ERK)1/2 activation; with the exception of interleukin (IL)-10, these ligands had differential effects on CD40-induced IL-1α, IL-6 and IL-12 production. CpG significantly enhanced the anti-leishmanial function of CD40 with differential effects on IL-4, IL-10 and interferon (IFN)-γ production in susceptible BALB/c mice. Thus, we report the first systematic study on CD40-TLR cross-talk that regulated the experimental L. major infection.
Collapse
|
32
|
Paul A, Gunewardena S, Stecklein SR, Saha B, Parelkar N, Danley M, Rajendran G, Home P, Ray S, Jokar I, Vielhauer GA, Jensen RA, Tawfik O, Paul S. PKCλ/ι signaling promotes triple-negative breast cancer growth and metastasis. Cell Death Differ 2014; 21:1469-81. [PMID: 24786829 DOI: 10.1038/cdd.2014.62] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 03/28/2014] [Accepted: 03/31/2014] [Indexed: 12/29/2022] Open
Abstract
Triple-negative breast cancer (TNBC) is a distinct breast cancer subtype defined by the absence of estrogen receptor (ER), progesterone receptor (PR) and epidermal growth factor receptor 2 (HER2/neu), and the patients with TNBC are often diagnosed with higher rates of recurrence and metastasis. Because of the absence of ER, PR and HER2/neu expressions, TNBC patients are insensitive to HER2-directed and endocrine therapies available for breast cancer treatment. Here, we report that expression of atypical protein kinase C isoform, PKCλ/ι, significantly increased and activated in all invasive breast cancer (invasive ductal carcinoma or IDC) subtypes including the TNBC subtype. Because of the lack of targeted therapies for TNBC, we choose to study PKCλ/ι signaling as a potential therapeutic target for TNBC. Our observations indicated that PKCλ/ι signaling is highly active during breast cancer invasive progression, and metastatic breast cancers, the advanced stages of breast cancer disease that developed more frequently in TNBC patients, are also characterized with high levels of PKCλ/ι expression and activation. Functional analysis in experimental mouse models revealed that depletion of PKCλ/ι significantly reduces TNBC growth as well as lung metastatic colonization. Furthermore, we have identified a PKCλ/ι-regulated gene signature consisting of 110 genes, which are significantly associated with indolent to invasive progression of human breast cancer and poor prognosis. Mechanistically, cytokines such as TGFβ and IL1β could activate PKCλ/ι signaling in TNBC cells and depletion of PKCλ/ι impairs NF-κB p65 (RelA) nuclear localization. We observed that cytokine-PKCλ/ι-RelA signaling axis, at least in part, involved in modulating gene expression to regulate invasion of TNBC cells. Overall, our results indicate that induction and activation of PKCλ/ι promote TNBC growth, invasion and metastasis. Thus, targeting PKCλ/ι signaling could be a therapeutic option for breast cancer, including the TNBC subtype.
Collapse
|
33
|
Naskar A, Ghosh M, Mallik S, Pal S, Bandyopadhyay B, Mukherjee S, Saha B. A profile of dengue outbreak in adults of an eastern state of India. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.1332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
|
34
|
Banerjee A, Pal D, Pal S, Naskar A, Ghosh M, Mallik S, Chaudhuri I, Mukhopadhyay B, Karak K, Saha B. A study on prevalence and antibiotic sensitivity pattern of bacteria causing lower respiratory tract infections and their association with risk groups. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.1133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
35
|
Pal D, Naskar A, Ghosh M, Mallik S, Banerjee B, Saha B. A study on short duration fever in a tertiary care centre in Kolkata, India. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.658] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
|
36
|
Das A, Pal S, Naskar A, Ghosh M, Mallik S, Roy Biswas R, Saha B. A clinicopathological study of peripheral lymphadenopathy in adults. Int J Infect Dis 2014. [DOI: 10.1016/j.ijid.2014.03.1045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
37
|
Petkov P, Yavahchova M, Möller O, Dewald A, Saha B, Fitzler A, Jessen K, Tonev D, Klug T, Heinze S, Jolie J, von Brentano P, Goutev N, Bazzacco D, Ur CA, Farnea CA, Axiotis M, Lunardi S, de Angelis G, Napoli DR, Marginean N, Martinez T, Caprio MA. Low-lying bands with different quadrupole deformation in 155Dy. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146602082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
38
|
Saha B, Bruneau J, Szabo G. Alcohol and hepatitis C virus infection modulates monocytes to macrophage differentiation. Alcohol 2013. [DOI: 10.1016/j.alcohol.2013.09.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
39
|
Chowdhury P, Samui S, Kundu T, Saha B. Synthesis and Characterization of Poly(Methyl Methacrylate) Grafted from Acacia Gum. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.200400016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
40
|
Srivastava S, Pandey SP, Jha MK, Chandel HS, Saha B. Leishmania expressed lipophosphoglycan interacts with Toll-like receptor (TLR)-2 to decrease TLR-9 expression and reduce anti-leishmanial responses. Clin Exp Immunol 2013; 172:403-9. [PMID: 23600828 DOI: 10.1111/cei.12074] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/16/2013] [Indexed: 12/12/2022] Open
Abstract
Two different Toll-like receptors (TLRs) have been shown to play a role in host responses to Leishmania infection. TLR-2 is involved in parasite survival in macrophages upon activation by lipophosphoglycan (LPG), a virulence factor expressed by Leishmania. In contrast, activation of TLR-9 has been shown to promote a host-protective response. However, whether there is a relationship between the interaction of LPG and TLR-2, on one hand, with the effect of TLR-9, on the other hand, remains unknown. In this study, we report that in-vitro infection of macrophages with a L. major parasite with high expression levels of LPG results in decreased TLR-9 expression compared to infection with a L. major parasite with lower expression levels of LPG. Addition of anti-LPG as well as anti-TLR-2 antibodies prevents this reduction of TLR-9 expression. Also, the addition of purified LPG to macrophages results in a decrease of TLR-9 expression, which is shown to be mediated by transforming growth factor (TGF)-β and interleukin (IL)-10. Finally, in-vitro treatment of macrophages with anti-LPG and/or anti-TLR-2 antibodies before infection reduces the number of amastigotes in macrophages and co-treatment of mice with anti-TLR-2 antibodies and cytosine-phosphate-guanosine (CpG) reduces footpad swelling and parasite load in the draining lymph nodes, accompanied by an interferon (IFN)-γ-predominant T cell response. Thus, for the first time, we show how interactions between LPG and TLR-2 reduce anti-leishmanial responses via cytokine-mediated decrease of TLR-9 expression.
Collapse
|
41
|
Basu A, Ghosh SK, Saha R, Nandi R, Ghosh T, Saha B. Effect of Some Non Functional Surfactants and Electrolytes on the Hexavalent Chromium Reduction by Glycerol: A Mechanistic Study. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110152] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
Hexavalent chromium is a widespread environmental contaminant and a known human carcinogen. Kinetics of reduction of hexavalent chromium by bio-molecule glycerol in micellar media have been studied spectrophotometrically. The cytoplasmic reduction of hexavalent chromium to trivalent chromium occurs in micro-heterogeneous systems. In vitro, the micelles are considered to mimic the cellular membranes. The electron transfer processes occurring in the micellar systems is considered as model to obtain insight into the electron transport process prevailing in biological systems. Micellar media is also a probe to establish the mechanistic paths of reduction of hexavalent chromium to trivalent chromium. Effects of electrolytes common to biological system are studied to establish the proposed reaction mechanism strongly.
Collapse
|
42
|
E. Lewis H, Quimby E, Saha B. Reducing the cost of drawing-up needles. Anaesthesia 2013; 68:210. [DOI: 10.1111/anae.12130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
43
|
Penke LR, Sudan R, Sathishkumar S, Saha B. Prostaglandin E2receptors have differential effects onLeishmania majorinfection. Parasite Immunol 2012; 35:51-4. [DOI: 10.1111/pim.12011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 09/06/2012] [Indexed: 11/27/2022]
|
44
|
|
45
|
Taraphdar P, Guha RT, Haldar D, Chatterjee A, Dasgupta A, Saha B, Mallik S. Socioeconomic consequences of HIV/AIDS in the family system. Niger Med J 2012; 52:250-3. [PMID: 22529508 PMCID: PMC3329095 DOI: 10.4103/0300-1652.93798] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
INTRODUCTION HIV/AIDS can lead to poverty affecting particularly women and young people and can halt or reverse socioeconomic development of a country. OBJECTIVE The objective of this study was to assess the socioeconomic consequences of HIV/AIDS within the family. MATERIALS AND METHODS A cross-sectional descriptive study was carried out among patients admitted in in-patient department and those attending integrated counseling and testing centre (ICTC) of School of Tropical Medicine, Kolkata. Data were gathered by interviewing the patients by using a predesigned questionnaire. RESULTS For prolonged duration and severity of disease, higher proportion of indoor patients reported loss of job, decreased family income, increased expenditure for care seeking, and faced greater economic consequences, reflected by selling assets. Loss of job was mainly due to illness (86.8%), disclosure of sero-status (13.2%), and predominantly among skilled workers. Assets were sold mainly to meet the cost of own illness for indoor patients, but more to meet the expenditure for husband's illness, in the case of ICTC patients. High school dropout seen in both groups was mainly due to economic reasons. HIV/AIDS status was known to other members of family for 84.8% of indoor patients out of which 15.4% experienced rejection by family members. Out of 72 ever married women indoor patients whose in-laws were aware of their HIV/AIDS status, 41.7%, 40.9%, and 33.33% reportedly were blamed for spouse's illness, and had strained relation with in-laws and spouse, respectively. CONCLUSION Intensive behavior change communication and provision of care and support are required to curb AIDS-related stigma, discrimination, and to maintain physical, mental, and social wellbeing of people living with HIV/AIDS.
Collapse
|
46
|
Adhikari A, Majumder S, Banerjee S, Gupta G, Bhattacharya P, Majumdar SB, Saha B, Majumdar S. Mycobacterium indicus pranii (Mw)-mediated protection against visceral leishmaniasis: involvement of TLR4 signalling. J Antimicrob Chemother 2012; 67:2892-902. [DOI: 10.1093/jac/dks315] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
|
47
|
Roduit C, Longo G, Benmessaoud I, Volterra A, Saha B, Dietler G, Kasas S. Stiffness tomography exploration of living and fixed macrophages. J Mol Recognit 2012; 25:241-6. [DOI: 10.1002/jmr.2184] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
48
|
Haigh K, Saha B, Vladisavljević G, Reynolds J. Kinetics of the Pre-Treatment of Used Cooking Oil Using Novozyme 435 for Biodiesel Production. ACTA ACUST UNITED AC 2012. [DOI: 10.1016/j.proeng.2012.07.502] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
|
49
|
Tully RP, Zaheer M, Saha B. Smokeless tobacco and cardiovascular risk in non-Caucasian patients. Br J Anaesth 2011; 107:105-6. [PMID: 21685119 DOI: 10.1093/bja/aer184] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
|
50
|
Saha B, Lessel D, Hisama FM, Leistritz DF, Friedrich K, Martin GM, Kubisch C, Oshima J. A Novel LMNA Mutation Causes Altered Nuclear Morphology and Symptoms of Familial Partial Lipodystrophy (Dunnigan Variety) with Progeroid Features. Mol Syndromol 2010; 1:127-132. [PMID: 21031082 DOI: 10.1159/000320166] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2010] [Accepted: 08/01/2010] [Indexed: 11/19/2022] Open
Abstract
Dunnigan-type partial lipodystrophy (familial partial lipodystrophy, Dunnigan variety, FPLD2) can be caused by LMNA mutations. We identified a novel heterozygous LMNA mutation, P485R, in a patient referred to the International Registry of Werner Syndrome because of features consistent with that of progeroid disorder but who was wild type at the WRN locus. The novel mutation is located 2 amino acids away from the canonical FPLD mutations in exon 8 of the LMNA gene. Immunocytochemical analysis revealed abnormal nuclear morphology characteristic of laminopathies within primary fibroblast cultures, but not in a lymphoblastoid cell line, in keeping with previous observations. Our findings indicate that FPLD2 should be considered in the differential diagnosis of the Werner syndrome.
Collapse
|