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Sengupta D, Bhargava DK, Dixit A, Sahoo BS, Biswas S, Biswas G, Mishra SK. ERRβ signalling through FST and BCAS2 inhibits cellular proliferation in breast cancer cells. Br J Cancer 2014; 110:2144-58. [PMID: 24667650 PMCID: PMC3992508 DOI: 10.1038/bjc.2014.53] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2013] [Revised: 11/06/2013] [Accepted: 01/13/2014] [Indexed: 12/11/2022] Open
Abstract
Background: The overexpression of oestrogen-related receptor-β (ERRβ) in breast cancer patients is correlated with improved prognosis and longer relapse-free survival, and the level of ERRβ mRNA is inversely correlated with the S-phase fraction of cells from breast cancer patients. Methods: Chromatin immunoprecipitation (ChIP) cloning of ERRβ transcriptional targets and gel supershift assays identified breast cancer amplified sequence 2 (BCAS2) and Follistatin (FST) as two important downstream genes that help to regulate tumourigenesis. Confocal microscopy, co-immunoprecipitation (CoIP), western blotting and quantitative real-time PCR confirmed the involvement of ERRβ in oestrogen signalling. Results: Overexpressed ERRβ induced FST-mediated apoptosis in breast cancer cells, and E-cadherin expression was also enhanced through upregulation of FST. However, this anti-proliferative signalling function was challenged by ERRβ-mediated BCAS2 upregulation, which inhibited FST transcription through the downregulation of β-catenin/TCF4 recruitment to the FST promoter. Interestingly, ERRβ-mediated upregulation of BCAS2 downregulated the major G1-S transition marker cyclin D1, despite the predictable oncogenic properties of BCAS2. Interpretation: Our study provides the first evidence that ERRβ, which is a coregulator of ERα also acts as a potential tumour-suppressor molecule in breast cancer. Our current report also provides novel insights into the entire cascade of ERRβ signalling events, which may lead to BCAS2-mediated blockage of the G1/S transition and inhibition of the epithelial to mesenchymal transition through FST-mediated regulation of E-cadherin. Importantly, matrix metalloprotease 7, which is a classical mediator of metastasis and E-cadherin cleavage, was also restricted as a result of ERRβ-mediated FST overexpression.
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Panigrahi I, Dixit A, Arora S, Kabra M, Mahapatra M, Choudhry VP, Saxena R. Do alpha deletions influence hydroxyurea response in thalassemia intermedia? Hematology 2013; 10:61-3. [PMID: 16019448 DOI: 10.1080/10245330400020439] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
Abstract
Thalassemia intermedia patients show variable phenotypes. Hydroxyurea (HU) may benefit some of the thalassemia intermedia cases (1), however, the parameters influencing the response to HU have not been reported. In this study, the molecular parameters, alpha-globin and beta-globin genotype and the Xmn I polymorphism, were correlated with the HU response. Twenty patients with thalassemia intermedia were given HU (10-20 mg/kg) and responses were evaluated over a one year period. Twelve patients (60%) showed a good response to therapy with a significant increase in Hb and HbF levels and with elimination of the transfusion requirement in four patients. Four out of the twelve (33%) patients were positive for -alpha(3.7) deletions whereas none of the 8 non-responders were positive for alpha deletions. One each of the responders and non-responders were positive for alpha alpha alpha(anti-3.7) triplication. Three (25%) responsive and one non-responsive patients were homozygous for the IVS1-1 (G-->T) mutation. Three of the responsive patients with alpha deletions were also homozygous positive for Xmn I polymorphism. Thus, in addition to acting in synergy with the XmnI polymorphism, alpha deletions may be an independent factor predicting good response to HU in thalassemia intermedia, although this needs to be confirmation in larger studies.
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Aggarwal A, Bansal A, Dixit A, Sharma V. Heartburn literally: cardiac injury due to corrosive ingestion. J Postgrad Med 2013; 59:152-3. [PMID: 23793321 DOI: 10.4103/0022-3859.113837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Hassan SA, Chauhan L, Barthwal R, Dixit A. A Qualitative and Quantitative Assay to Study DNA/Drug Interaction Based on Sequence Selective Inhibition of Restriction Endonucleases. TROP J PHARM RES 2013. [DOI: 10.4314/tjpr.v11i5.4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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30
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Foley C, Mushi A, Dixit A. Tension pneumocephalus after facial surgery. Assoc Med J 2013. [DOI: 10.1136/bmj.f536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Dixit A, Chandler KE, Lever M, Poole RL, Bullman H, Mughal MZ, Steggall M, Suri M. Pseudohypoparathyroidism type 1b due to paternal uniparental disomy of chromosome 20q. J Clin Endocrinol Metab 2013; 98:E103-8. [PMID: 23144470 DOI: 10.1210/jc.2012-2639] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Pseudohypoparathyroidism type 1b (PHP1b) is the result of end-organ resistance to PTH and other hormones such as TSH in the absence of any features of Albright's hereditary osteodystrophy. Patients with PHP1b show imprinting abnormalities at the complex GNAS locus. The molecular cause of autosomal dominant familial PHP1b has been well-defined with identification of microdeletions within the GNAS locus or the nearby STX16, but the molecular mechanism of the GNAS imprinting defects in sporadic PHP1b cases remains elusive. OBJECTIVE We investigated the underlying molecular mechanism of GNAS imprinting defects in two patients with sporadic PHP1b. RESULTS We identified paternal uniparental disomy of the long arm of chromosome 20 (patUPD20) in two unrelated patients with sporadic PHP1b. This provides an explanation for the patients' GNAS methylation abnormalities and hormone resistance. Our data and a review of the six published cases of patUPD20 suggest that high birth weight and/or early-onset obesity and macrocephaly may also represent features of patUPD20. CONCLUSION We suggest that patUPD20 should be considered in the evaluation of patients with sporadic PHP1b.
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Trivedi S, Dixit A, Kotgiriwar S, Athavale S, Gupta V, Deopujari R. Variations in the Branching Pattern of Renal Artery and its Clinical Implications. J ANAT SOC INDIA 2012. [DOI: 10.1016/s0003-2778(12)80036-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Dixit A, Tanteles G, Ocraft K, McEwan A, Sarkar A. Monozygotic twins discordant for trisomy 13: counselling and management issues. J Perinatol 2012; 32:639-41. [PMID: 22842802 DOI: 10.1038/jp.2011.145] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The diagnosis and management of a heterokaryotypic monochorionic pregnancy, in which one of twins had trisomy 13, is presented. Monozygosity and discordant karyotypes were confirmed by amniocentesis of both the sacs. Radiofrequency ablation of the trisomic twin was successfully performed at 18-weeks gestation and the pregnancy ended at term with the birth of a healthy girl who remains well on follow-up at 12 months of age. We reiterate the importance of early amniocentesis of both the sacs in the presence of discordant fetal abnormalities and consideration of selective fetal termination to optimise the outcome of heterokaryotypic monochorionic twin pregnancies.
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Ovadia C, Dixit A. The management of gestational diabetes. Curr Diabetes Rev 2012; 8:247-56. [PMID: 22587510 DOI: 10.2174/157339912800840497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2012] [Revised: 03/09/2012] [Accepted: 04/21/2012] [Indexed: 11/22/2022]
Abstract
The incidence of gestational diabetes is increasing, with higher obesity in the pregnant population, lifestyle changes and migration thought to underlie this. Recent large studies, such as the MiG, HAPO and ACHOIS trials, have furthered our understanding of both the implications of the disease and the management options available. Previous CEMACH (Confidential Enquiries into Maternal and Child Health) studies of diabetes in pregnancy have shown a significant proportion of patients receiving sub-optimal care. We aim to summarise the current standard of management strategies in pregnancy, whilst acknowledging controversies and limitations in the existing evidence. Antenatal management involves service organisation to provide multi-disciplinary team reviews to address glycaemic control, fetal monitoring and associated conditions such as obesity and hypertensive disorders of pregnancy. The use of diet, exercise, oral hypoglycaemic agents and insulins will be discussed, along with specific considerations for the management of preterm labour and administration of corticosteroids for fetal lung maturity. The timing and management of labour, including mechanisms of delivery, will be covered, including neonatal considerations and the use of breast feeding. Finally, a discussion of appropriate post delivery care will consider the prevention of, and screening for, the development of type 2 diabetes.
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Dixit A, McKee S, Mansour S, Mehta SG, Tanteles GA, Anastasiadou V, Patsalis PC, Martin K, McCullough S, Suri M, Sarkar A. 7q11.23 Microduplication: a recognizable phenotype. Clin Genet 2012; 83:155-61. [PMID: 22369319 DOI: 10.1111/j.1399-0004.2012.01862.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Williams-Beuren syndrome is a well-known microdeletion syndrome with a recognizable clinical phenotype. The subtle phenotype of the reciprocal microduplication of the Williams-Beuren critical region has been described recently. We report seven further patients, and a transmitting parent, with 7q11.23 microduplication. All our patients had speech delay, autistic features and facial dysmorphism consistent with the published literature. We conclude that the presence of specific dysmorphic features, including straight, neat eyebrows, thin lips and a short philtrum, in our patients with speech delay and autistic features provides further evidence that the children with 7q11.23 microduplication have a recognizable phenotype.
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Dixit A, Bhardwaj M, Sharma B. Headache in pregnancy: a nuisance or a new sense? Obstet Gynecol Int 2012; 2012:697697. [PMID: 22518165 PMCID: PMC3306951 DOI: 10.1155/2012/697697] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2011] [Accepted: 11/30/2011] [Indexed: 11/23/2022] Open
Abstract
Headache is a very commonly encountered symptom in pregnancy and is usually due to primary headache disorders which are benign in nature. It can however be quite debilitating for some women who may need therapeutic treatment of which there are several options safe to use in pregnancy. It is equally important though to recognise that headache may be a sign of serious underlying pathology. This paper aims to provide a clinically useful guidance for differentiation between primary and secondary headaches in pregnancy. The primary headache disorders and their management in pregnancy are explored in depth with brief overviews of the causes for secondary headaches and their further investigation and management.
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Dixit A, Tumala B. Inactivation of Stachybotrys Antigen by Mold Remediation Chemicals. J Allergy Clin Immunol 2012. [DOI: 10.1016/j.jaci.2011.12.929] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Sayed FN, Mandal BP, Jayakumar OD, Arya A, Kadam RM, Dixit A, Naik R, Tyagi AK. Rare Examples of Fluoride-Based Multiferroic Materials in Mn-substituted BaMgF4 Systems: Experimental and Theoretical Studies. Inorg Chem 2011; 50:11765-72. [DOI: 10.1021/ic201835q] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Pandey P, Dixit A, Bedi S, Kapoor K, Mahajan NC. Hashimoto's thyroiditis in ectopic thyroid tissue: a diagnostic surprise. Cytopathology 2011; 23:419-21. [PMID: 21838719 DOI: 10.1111/j.1365-2303.2011.00906.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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40
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Dixit A, Nair S, Williams P, Wiper A, Clarke B, Deaton C, El-Omar M, Fraser D, Khattar R, Mahadevan V, Neyses L, Ordoubadi F, Mamas M. 37 Decrease in mace rates associated with drug eluting stent use in patients with diabetes undergoing PCI in large diameter coronary arteries. BRITISH HEART JOURNAL 2011. [DOI: 10.1136/heartjnl-2011-300198.37] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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41
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Mahajan R, Singh NR, Singh J, Dixit A, Jain A, Gupta A. Assessment of Awareness among Clinicians about Concepts in Undergraduate Pharmacology Curriculum: A Novel Cross-sectional Study. J Young Pharm 2010; 2:301-5. [PMID: 21042490 PMCID: PMC2964763 DOI: 10.4103/0975-1483.66797] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
OBJECTIVE In the last 30 years, concepts in pharmacology have moved from Essential Medicines (EM) to P-drugs via the Rational Use of Medicines (RUM), but no structured study has evaluated the level of understanding among working clinicians about these concepts. The present study is designed to fulfill that lacuna. MATERIALS AND METHODS A cross-sectional study was carried out in and around the teaching hospitals attached to Medical Colleges, enrolling 504 clinicians from six centers across North India to fill-up a questionnaire containing 25 questions. The results were compiled using percentages and averages. RESULTS Only one-fourth of the participants claimed that they always prescribed Essential Medicines; no one could accurately count the number of drugs / drug combinations in the Indian Essential Drug list; only 15.1% of the clinicians used to write the generic names of drugs on a prescription slip; about one-third of the clinicians were not fully aware about the adverse effects, drug interactions, and contraindications of the drugs they prescribed; about 83% of the physicians admitted to rely on information from Medical Representatives (MRs) and the interest in research activities seemed to be lost. CONCLUSION Results show a sorry state of affairs among clinicians, as far as the level of understanding about EM, P-drugs, and RUM is concerned, and points toward arranging more continuing medical education (CME) for clinicians regarding these concepts.
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Bhardwaj M, Dixit A. Dialysis for severe hyponatraemia in preeclampsia. Obstet Med 2010; 3:87. [PMID: 27582851 DOI: 10.1258/om.2010.100019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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43
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Nair SB, Chacko SM, Dixit A, Rishton P, Steward N, Rezai R, Khattar RS. 124 Comparison of patients' demographics, in-hospital and 3-year mortality rates and independent predictors of death in ST-elevation vs non-ST elevation myocardial infarction—an interventional centre experience. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.196089.19] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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44
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Kumar S, Gupta A, Dixit A, Solanki K, Balasubramanyam G, Duraiswamy P, Kulkarni S. Factors that effect dental caries status of medical students in Udaipur city, India. Int J Dent Hyg 2010; 8:110-5. [DOI: 10.1111/j.1601-5037.2009.00399.x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Parker R, Dixit A, Fraser A, Creed TJ, Probert CS. Clinical experience of methotrexate in Crohn's disease: response, safety and monitoring of treatment. Postgrad Med J 2010; 86:208-11. [DOI: 10.1136/pgmj.2009.085787] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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46
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Qadir S, Dixit A. Use of medicinal plants to control Haemonchus contortus infection in small ruminants. Vet World 2010. [DOI: 10.5455/vetworld.2010.515-518] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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47
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Dixit A, Lawes G. Development of electrical polarization at an antiferromagnetic transition in FeVO(4). JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:456003. [PMID: 21694024 DOI: 10.1088/0953-8984/21/45/456003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We have probed changes in the magnetic, electrical, dielectric, optical, and thermodynamic properties of iron vanadate (FeVO(4)) at two magnetic phase transitions. FeVO(4) exhibits two antiferromagnetic transitions at T(N1) = 22 K and T(N2) = 15 K. Below 15 K FeVO(4) develops an electric polarization, concomitant with the second antiferromagnetic transition and indicating strong magnetoelectric coupling. The powder averaged zero field electric polarization for the polycrystalline FeVO(4) sample is 6 µC m(-2) and can be switched by reversing the poling voltage. The peaks for certain Raman modes at larger wavenumbers shift to slightly higher energies in the temperature range between T(N1) and T(N2), but there is practically no change in the Raman spectra between the paramagnetic and ground states. These Raman features help to clarify the microscopic mechanisms for magnetoelectric coupling in FeVO(4).
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Macdonald S, Dixit A, Wyatt MG. "Brain attack". BMJ 2009; 338:a3109. [PMID: 19359302 DOI: 10.1136/bmj.a3109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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49
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Kharel P, Talebi S, Ramachandran B, Dixit A, Naik VM, Sahana MB, Sudakar C, Naik R, Rao MSR, Lawes G. Structural, magnetic, and electrical studies on polycrystalline transition-metal-doped BiFeO(3) thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2009; 21:036001. [PMID: 21817284 DOI: 10.1088/0953-8984/21/3/036001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We have synthesized a range of transition-metal-doped BiFeO(3) thin films on conducting silicon substrates using a spin-coating technique from metal-organic precursor solutions. Bismuth, iron and transition-metal-organic solutions were mixed in the appropriate ratios to produce 3% transition-metal-doped samples. X-ray diffraction studies show that the samples annealed in a nitrogen atmosphere crystallize in a rhombohedrally distorted BiFeO(3) structure with no evidence for any ferromagnetic secondary phase formation. We find evidence for the disappearance of the 404 cm(-1) Raman mode for certain dopants indicative of structural distortions. The saturation magnetization of these BiFeO(3) films has been found to increase on doping with transition metal ions, reaching a maximum value of 8.5 emu cm(-3) for the Cr-doped samples. However, leakage current measurements find that the resistivity of the films typically decreases with transition metal doping. We find no evidence for any systematic variation of the electric or magnetic properties of BiFeO(3) depending on the transition metal dopant, suggesting that these properties are determined mainly by extrinsic effects arising from defects or grain boundaries.
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Agarwal S, Kumar R, Gupta P, Dixit A. Identification and Characterization of a Positive Regulatory cis-element Within the Upstream Region of c-jun. J Biochem 2008; 144:741-52. [DOI: 10.1093/jb/mvn129] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
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