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1.
J Pharm Bioallied Sci ; 15(Suppl 2): S888-S891, 2023 Jul.
Article in English | MEDLINE | ID: mdl-37694020

ABSTRACT

Introduction: Transgenders (TGs) are one of the vulnerable groups in our society. Trans people experience substantial health disparities and barriers to appropriate health care services that keep them from achieving the highest possible health status. Methodology: The study was conducted over the course of 12 months at the Transgender Shelter Home. Focus group discussion (FGD) took place with 6-12 participants and the researcher acted as moderator. The questions were asked under four domains; sociodemographic variables, behavioral variables, medical and health status variables, and access and utilization of dental services barrier variables. Transcripts were coded and data analysis was concurrent with data collection to allow to know new insights. The data analysis was done by MAXQDA software 2022.0.0. It is being developed and distributed by VERBI Software based in Berlin, Germany. Results: The barriers and facilitators explored were categorized at three levels: (1) the personal level, relating to those barriers and facilitators that the individual faced for their oral health care, and the perspectives regarding the delivery of care; (2) the inter-personal level; and (3) the system level, for identifying the wider elements and their influence. Discussion: Social stigma and marginalization have been linked to adverse health effects, including personal attributes, structural and environmental factors, and personal perceptions of stigmatization. Conclusion: It is evident that lesbian, gay, bisexual, transgender, and queer (LGBTQ) communities have specific but varied health care needs, and the greatest way to treat these necessities is via exposure to professional, health care coverage.

3.
Sci Rep ; 12(1): 12414, 2022 07 20.
Article in English | MEDLINE | ID: mdl-35858932

ABSTRACT

The iron impregnated fungal bio-filter (IIFB) discs of luffa sponge containing Phanerochaete chrysosporium mycelia have been used for the removal of As(III) from water. Two different forms of same biomass viz. free fungal biomass (FFB) and modified free fungal biomass (chemically modified and iron impregnated; CFB and IIFB) have been simultaneously investigated to compare the performance of immobilization, chemo-tailoring and iron impregnation for remediation of As(III). IIFB showed highest uptake capacity and percentage removal of As(III), 1.32 mg/g and 92.4% respectively among FFB, CFB and IIFB. Further, the application of RSM and ANN-GA based mathematical model showed a substantial increase in removal i.e. 99.2% of As(III) was filtered out from water at optimised conditions i.e. biomass dose 0.72 g/L, pH 7.31, temperature 42 °C, and initial As(III) concentration 1.1 mg/L. Isotherm, kinetic and thermodynamic studies proved that the process followed monolayer sorption pattern in spontaneous and endothermic way through pseudo-second order kinetic pathway. Continuous mode of As(III) removal in IIFB packed bed bioreactor, revealed increased removal of As(III) from 76.40 to 88.23% with increased column height from 5 to 25 cm whereas the removal decreased from 88.23 to 69.45% while increasing flow rate from 1.66 to 8.30 mL/min. Moreover, the IIFB discs was regenerated by using 10% NaOH as eluting agent and evaluated for As(III) removal for four sorption-desorption cycles, showing slight decrease of their efficiency by 1-2%. SEM-EDX, pHzpc, and FTIR analysis, revealed the involvement of hydroxyl and amino surface groups following a non-electrostatic legend exchange sorption mechanism during removal of As(III).


Subject(s)
Water Pollutants, Chemical , Water Purification , Adsorption , Biomass , Hydrogen-Ion Concentration , Iron , Kinetics , Thermodynamics , Water , Water Pollutants, Chemical/metabolism
4.
Animals (Basel) ; 12(5)2022 Mar 06.
Article in English | MEDLINE | ID: mdl-35268228

ABSTRACT

Visual leopard identifications performed with camera traps using the capture-recapture method only consider areas of the skin that are visible to the equipment. The method presented here considered the spot or rosette formations of either the two flanks or the face, and the captured images were then compared and matched with available photographs. Leopards were classified as new individuals if no matches were found in the existing set of photos. It was previously assumed that an individual leopard's spot or rosette pattern would not change. We established that the spot and rosette patterns change over time and that these changes are the result of injuries in certain cases. When compared to the original patterns, the number of spots may be lost or reduced, and some spots or patterns may change in terms of their prominence, shape, and size. We called these changes "obliterate changes" and "rejig changes", respectively. The implementation of an earlier method resulted in a duplication of leopard counts, achieving an error rate of more than 15% in the population at Yala National Park. The same leopard could be misidentified and counted multiple times, causing overestimated populations. To address this issue, we created a new two-step methodology for identifying Sri Lankan leopards. The multi-point identification method requires the evaluation of at least 9-10 spot areas before a leopard can be identified. Moreover, the minimum leopard population at the YNP 1 comprises at least 77 leopards and has a density of 0.5461 leopards per km2.

5.
Respir Med Case Rep ; 37: 101640, 2022.
Article in English | MEDLINE | ID: mdl-35345568

ABSTRACT

Inhalational injury to the upper and lower airway occurs due to thermal or chemical irritation causing airway edema, capillary leak, mucin, and fibrin debris forming clots and soot. The use of unfractionated heparin (UFH) nebulization was found to be effective by dissolving airway clots. We report a case of inhalational burn injury where UFH nebulization led to a better outcome. A healthy male was trapped in a residential room during a fire in the building. He sustained facial, neck, upper chest, and left upper extremity burns accounting for 25% of body surface area. He was intubated at the site and started on supportive care. In the surgical intensive care unit, bronchoscopy showed severe tracheobronchial burn injury; a thorough lavage was done, started on UFH and N-acetylcysteine nebulization (NAC). The patient improved, and his trachea was extubated on day 6. In our patient, unfractionated heparin nebulization was beneficial as the patient was extubated early without landing to acute respiratory distress syndrome.

6.
J Family Med Prim Care ; 10(8): 3051-3055, 2021 Aug.
Article in English | MEDLINE | ID: mdl-34660446

ABSTRACT

INTRODUCTION: Odisha has the third highest percentage of tribal population in India. This study was conducted to evaluate the oral health status and treatment needs of tribal population residing in northern Bhubaneswar. MATERIAL AND METHODS: A crosssectional household survey was conducted using the modified WHO Oral Health Assessment Form (2013). Cluster random sampling technique was employed. Type III clinical examination was done. Statistical analysis was carried out using Chi square test, t test and ANOVA. RESULTS: A total of 877 participants were examined out of which 589 were males and 288 females with age ranging from 2-74 years. The mean dmft score was 4.13 ± 0.73 in 2-5-year-old participants, and in the age groups of 35-44 years and 65-74 years, the scores were 5.32 ± 2.36 and 7.56 ± 4.29 respectively. Statistically significant differences were observed in the presence of healthy gums, bleeding gums and presence of shallow pockets across the different age groups. Preventive treatment was required mostly by the participants in the age group 13-15 years. CONCLUSION: The present study showed a high prevalence of dental caries and periodontal disease among the study participants. Preventive treatment was required mostly by the participants in the age group 13-15 years.

7.
Neoplasia ; 23(7): 676-691, 2021 07.
Article in English | MEDLINE | ID: mdl-34139452

ABSTRACT

The blood-brain barrier (BBB) is a major anatomical and physiological barrier limiting the passage of drugs into brain. Central nervous system tumors can impair the BBB by changing the tumor microenvironment leading to the formation of a leaky barrier, known as the blood-tumor barrier (BTB). Despite the change in integrity, the BTB remains effective in preventing delivery of chemotherapy into brain tumors. Focused ultrasound is a unique noninvasive technique that can transiently disrupt the BBB and increase accumulation of drugs within targeted areas of the brain. Herein, we summarize the current understanding of different types of targeted ultrasound mediated BBB/BTB disruption techniques. We also discuss influence of the tumor microenvironment on BBB opening, as well as the role of immunological response following disruption. Lastly, we highlight the gaps between evaluation of the parameters governing opening of the BBB/BTB. A deeper understanding of physical opening of the BBB/BTB and the biological effects following disruption can potentially enhance treatment strategies for patients with brain tumors.


Subject(s)
Blood-Brain Barrier/metabolism , Blood-Brain Barrier/radiation effects , Brain Neoplasms/metabolism , Drug Delivery Systems , Tumor Microenvironment/radiation effects , Ultrasonic Waves , Animals , Biological Transport/radiation effects , Biological Variation, Population , Brain Neoplasms/drug therapy , Brain Neoplasms/etiology , Brain Neoplasms/pathology , Disease Models, Animal , High-Intensity Focused Ultrasound Ablation/adverse effects , High-Intensity Focused Ultrasound Ablation/methods , Humans , Neoplasm Metastasis , Permeability/radiation effects , Treatment Outcome , Tumor Microenvironment/drug effects , Tumor Microenvironment/immunology , Ultrasonic Therapy
8.
BMC Pregnancy Childbirth ; 21(1): 389, 2021 May 19.
Article in English | MEDLINE | ID: mdl-34011316

ABSTRACT

BACKGROUND: Since 2005, India has experienced an impressive 77% reduction in maternal mortality compared to the global average of 43%. What explains this impressive performance in terms of reduction in maternal mortality and improvement in maternal health outcomes? This paper evaluates the effect of household wealth status on maternal mortality in India, and also separates out the performance of the Empowered Action Group (EAG) states and the Southern states of India. The results are discussed in the light of various pro-poor programmes and policies designed to reduce maternal mortality and the existing supply side gaps in the healthcare system of India. Using multiple sources of data, this study aims to understand the trends in maternal mortality (1997-2017) between EAG and non EAG states in India and explore various household, economic and policy factors that may explain reduction in maternal mortality and improvement in maternal health outcomes in India. METHODS: This study triangulates data from different rounds of Sample Registration Systems to assess the trend in maternal mortality in India. It further analysed the National Family Health Surveys (NFHS). NFHS-4, 2015-16 has gathered information on maternal mortality and pregnancy-related deaths from 601,509 households. Using logistic regression, we estimate the association of various socio-economic variables on maternal deaths in the various states of India. RESULTS: On an average, wealth status of the households did not have a statistically significant association with maternal mortality in India. However, our disaggregate analysis reveals, the gains in terms of maternal mortality have been unevenly distributed. Although the rich-poor gap in maternal mortality has reduced in EAG states such as Bihar, Odisha, Assam, Rajasthan, the maternal mortality has remained above the national average for many of these states. The EAG states also experience supply side shortfalls in terms of availability of PHC and PHC doctors; and availability of specialist doctors. CONCLUSIONS: The novel contribution of the present paper is that the association of household wealth status and place of residence with maternal mortality is statistically not significant implying financial barriers to access maternal health services have been minimised. This result, and India's impressive performance with respect to maternal health outcomes, can be attributed to the various pro-poor policies and cash incentive schemes successfully launched in recent years. Community-level involvement with pivotal role played by community health workers has been one of the major reasons for the success of many ongoing policies. Policy makers need to prioritise the underperforming states and socio-economic groups within the states by addressing both demand-side and supply-side measures simultaneously mediated by contextual factors.


Subject(s)
Health Status Disparities , Income/statistics & numerical data , Maternal Mortality , Poverty/statistics & numerical data , Adult , Female , Health Surveys , Humans , India/epidemiology , Maternal Mortality/trends , Socioeconomic Factors , Young Adult
9.
Neurol India ; 68(1): 26-34, 2020.
Article in English | MEDLINE | ID: mdl-32129239

ABSTRACT

Over the last decade, research has intensified worldwide on the use of low-temperature plasmas in medicine and healthcare. Researchers have discovered many methods of applying plasmas to living tissues to deactivate pathogens; to end the flow of blood without damaging healthy tissue; to sanitize wounds and accelerate its healing; and to selectively kill malignant cancer cells. This review paper presents the latest development of advanced and plasma-based technologies used for applications in neurology in particular. Institute for Plasma Research (IPR), an aided institute of the Department of Atomic Energy (DAE), has also developed various technologies in some of these areas. One of these is an Atmospheric Pressure Plasma Jet (APPJ). This device is being studied to treat skin diseases, for coagulation of blood at faster rates and its interaction with oral, lung, and brain cancer cells. In certain cases, in-vitro studies have yielded encouraging results and limited in-vivo studies have been initiated. Plasma activated water has been produced in the laboratory for microbial disinfection, with potential applications in the health sector. Recently, plasmonic nanoparticle arrays which allow detection of very low concentrations of chemicals is studied in detail to allow early-stage detection of diseases. IPR has also been developing AI-based software called DeepCXR and AIBacilli for automated, high-speed screening and detection of footprints of tuberculosis (TB) in Chest X-ray images and for recognizing single/multiple TB bacilli in sputum smear test images, respectively. Deep Learning systems are increasingly being used around the world for analyzing electroencephalogram (EEG) signals for emotion recognition, mental workload, and seizure detection.


Subject(s)
Neoplasms/diagnostic imaging , Neoplasms/surgery , Tuberculosis/diagnostic imaging , Tuberculosis/surgery , Academies and Institutes , Deep Learning , Humans , Plasma/diagnostic imaging , Spectrum Analysis, Raman/methods
10.
SSM Popul Health ; 5: 201-209, 2018 Aug.
Article in English | MEDLINE | ID: mdl-30094315

ABSTRACT

•Temporal trends in inequalities in infant and child mortality over two and half decades in India.•Relative change in inequalities in child mortality over survey periods.•Scatter plots to identify states with largest inequalities among wealth index groups.•Concentration Index by various background characteristics and decomposition analysis to identify factors contributing in inequality in infant mortality between richest and poorest groups.•Gap between the poorest and richest groups has narrowed in most states in India in recent years.

11.
Rev Sci Instrum ; 88(6): 063507, 2017 Jun.
Article in English | MEDLINE | ID: mdl-28668009

ABSTRACT

A large plasma fireball is formed using a reverse biased planar sputter magnetron source. The magnetic field considerably reduces the contact area of the anode with the plasma and results in the formation of the fireball. Ions are extracted from the fireball using a large voltage cathode sheath of the grounded sample holder. The physical mechanism for the extraction of the ions from the fireball along with the effect of the sample holder on the fireball and the discharge current is discussed. The device is shown as a novel tool for developing nanodot patterns on a GaSb substrate without the use of additional ion source or power supplies. Variable nanodot patterns produced simply by the alteration of discharge conditions demonstrate unique surface wettability and reflection properties.

12.
Ann Oncol ; 28(3): 597-603, 2017 03 01.
Article in English | MEDLINE | ID: mdl-27998968

ABSTRACT

Background: Lung cancer is the leading cause of cancer-related deaths across the world. In this study, we present therapeutically relevant genetic alterations in lung adenocarcinoma of Indian origin. Materials and methods: Forty-five primary lung adenocarcinoma tumors were sequenced for 676 amplicons using RainDance cancer panel at an average coverage of 1500 × (reads per million mapped reads). To validate the findings, 49 mutations across 23 genes were genotyped in an additional set of 363 primary lung adenocarcinoma tumors using mass spectrometry. NIH/3T3 cells over expressing mutant and wild-type FGFR3 constructs were characterized for anchorage independent growth, constitutive activation, tumor formation and sensitivity to FGFR inhibitors using in vitro and xenograft mouse models. Results: We present the first spectrum of actionable alterations in lung adenocarcinoma tumors of Indian origin, and shows that mutations of FGFR3 are present in 20 of 363 (5.5%) patients. These FGFR3 mutations are constitutively active and oncogenic when ectopically expressed in NIH/3T3 cells and using a xenograft model in NOD/SCID mice. Inhibition of FGFR3 kinase activity inhibits transformation of NIH/3T3 overexpressing FGFR3 constructs and growth of tumors driven by FGFR3 in the xenograft models. The reduction in tumor size in the mouse is paralleled by a reduction in the amounts of phospho-ERK, validating the in vitro findings. Interestingly, the FGFR3 mutations are significantly higher in a proportion of younger patients and show a trend toward better overall survival, compared with patients lacking actionable alterations or those harboring KRAS mutations. Conclusion: We present the first actionable mutation spectrum in Indian lung cancer genome. These findings implicate FGFR3 as a novel therapeutic in lung adenocarcinoma.


Subject(s)
Adenocarcinoma/drug therapy , Adenocarcinoma/genetics , Drug Resistance, Neoplasm/genetics , Lung Neoplasms/drug therapy , Lung Neoplasms/genetics , Receptor, Fibroblast Growth Factor, Type 3/genetics , Adenocarcinoma/pathology , Adenocarcinoma of Lung , Adult , Aged , Animals , Cell Proliferation/drug effects , Female , Gene Expression Regulation, Neoplastic , Humans , Lung Neoplasms/pathology , Male , Mice , Middle Aged , Mutation , NIH 3T3 Cells , Proto-Oncogene Proteins p21(ras)/genetics , Pyrimidines/administration & dosage , Receptor, Fibroblast Growth Factor, Type 3/antagonists & inhibitors , Xenograft Model Antitumor Assays
13.
Mol Oral Microbiol ; 30(2): 87-96, 2015 Apr.
Article in English | MEDLINE | ID: mdl-25052707

ABSTRACT

Some amino acids are more energetically costly to synthesize de novo, therefore many microbes have evolved to regulate the metabolic expenditure of the cell and reduce the energy burden of extracellular unrecyclable proteins. Several oral bacterial species take up amino acids and peptides obtained from proteolysis of host proteins and hence do not rely only on de novo synthesis. The aim of this study was to investigate if five oral bacterial species implement cost management strategies to reduce the energy burden of extracellular unrecyclable proteins. Since the relative de novo amino acid synthesis costs are proportional to the masses of the amino acids, the energy costs of producing proteins were assessed by calculating the mean amino acid mass for each protein. For Porphyromonas gingivalis, Treponema denticola, Tannerella forsythia, Prevotella intermedia and Streptococcus sanguinis, the outer membrane/extracellular proteins are made up of a much larger percentage of lower average mass amino acids whereas cytoplasmic proteins are made up of a larger proportion of higher average mass amino acid residues. These results are consistent with the five oral bacterial species employing energy-saving mechanisms in the production of extracellular unrecyclable proteins. Interestingly, the P. gingivalis and S. sanguinis genomes exhibited significantly lower predicted mean amino acid masses compared with those of the genomes of the other three species, suggesting that this may provide them with an energy advantage with respect to protein biosynthetic cost.


Subject(s)
Amino Acids/biosynthesis , Bacteria/metabolism , Bacterial Outer Membrane Proteins/metabolism , Computational Biology , Mouth/pathology , Bacteria/classification , Bacteroidetes/metabolism , Genome, Bacterial , Mouth/microbiology , Porphyromonas gingivalis/metabolism , Prevotella intermedia/metabolism , Streptococcus/metabolism , Treponema denticola/metabolism
14.
J Phys Condens Matter ; 26(14): 145302, 2014 Apr 09.
Article in English | MEDLINE | ID: mdl-24651594

ABSTRACT

Anisotropic nanoparticle (NP) arrays with useful optical properties, such as localized plasmon resonances (LPRs), can be grown by self-assembly on substrates. However, these systems often have significant dispersion in NP dimensions and distribution, which makes a numerical approach to modeling the LPRs very difficult. An improved analytic approach to this problem is discussed in detail and applied successfully to NP arrays from three systems that differ in NP metal, shape and distribution, and in substrate and capping layer. The materials and anisotropic NP structures that will produce LPRs in desired spectral regions can be determined using this approach.


Subject(s)
Biosensing Techniques , Gold/chemistry , Metal Nanoparticles/chemistry , Models, Molecular , Optical Fibers , Surface Plasmon Resonance/methods , Anisotropy , Nanotechnology , Surface Properties
15.
J Nanosci Nanotechnol ; 12(6): 4540-5, 2012 Jun.
Article in English | MEDLINE | ID: mdl-22905497

ABSTRACT

Growth of bimodally distributed silver nanoparticles using sequential physical vapour deposition (PVD) is reported. Growth conditions of nanoparticles are defined in the following three steps: In the first step, nanoparticles are grown at a heated substrate and then exposed to atmosphere, in the second step, nanoparticles are vacuum annealed and finally re-deposition of silver is performed in the third step. This special way of deposition leads to the formation of bimodally distributed nanoparticles. It has been investigated that by changing the deposition time, different sets of bimodally distributed nanoparticles can be grown. Localized surface plasmon resonance (LSPR) of such bimodally distributed nanoparticles generates double plasmon resonance peaks with overlapped absorption spectra. Double plasmon resonance peaks provide a quick indication of the existence of two sets of nanoparticles. LSPR spectra of such bimodally distributed nanoparticles could be modeled with double Lorentz oscillator model. Inclusion of double Lorentz oscillator model indicates that there exist two sets of non-interacting nanoparticles resonating at different plasma frequencies. It is also reported that silver nanoparticles grown at a heated substrate, again attain the new shape while being exposed to atmosphere, followed by vacuum annealing at the same temperature. This is because of physisorption of oxygen at the silver surface and change in surface free energy. The re-shaping due to the adsorbed oxygen on the surface is responsible for bimodal size distribution of nanoparticles.


Subject(s)
Metal Nanoparticles/chemistry , Models, Chemical , Nanostructures/chemistry , Nanostructures/ultrastructure , Oscillometry/methods , Silver/chemistry , Surface Plasmon Resonance/methods , Computer Simulation , Macromolecular Substances/chemistry , Materials Testing , Molecular Conformation , Particle Size , Surface Properties
16.
J Stem Cells Regen Med ; 7(2): 75-9, 2011.
Article in English | MEDLINE | ID: mdl-24693174

ABSTRACT

A rapid decline in self-renewability, viability and function, of isolated stem cells are major hurdles in developing cell based therapies. There has been an increasing interest towards identifying a support material for maintaining stem cell features of the isolated cells. Pioneering observations of the present paper, demonstrate functionally diverse potential of Solid Lipid Nanoparticles (SLNs) in deciding the fate & behavior of mouse mesenchymal stem cell. The evidences are provided to show the dual nature of the SLNs for being a scaffold for the stem cell attachment, to retain stemness, and as reagent for inducing stem cell differentiation. Scanning electron microscopic examinations together with expression analysis were used to conform to such observations. Results of the study thus suggest that Solid lipid nanoparticles can be used as a good support material when functionalized to achieve adhesive properties and as a molecular paradigm for studying the adipocytic differentiation. We envisage a new role of SLNs towards regulating stem cell character by orchestrating the structural alignment during preparation of Solid lipid nanoparticles.

17.
Mol Cell Neurosci ; 7(5): 404-18, 1996 May.
Article in English | MEDLINE | ID: mdl-8812065

ABSTRACT

Tyrosine phosphorylation is key to the differentiation of oligodendrocytes, as the FGF2 and PDGF receptor tyrosine kinases are known to mediate the proliferation and maintenance of their precursors. Marked changes in the levels and localization of tyrosine-phosphorylated proteins were found to accompany differentiation in the CG4 rat oligodendrocyte cell line. These alterations in phosphorylation as well as other differentiation-specific changes were found to be sensitive to inhibition by a tyrosine phosphatase inhibitor. This suggested that at some point early in the differentiation process, tyrosine phosphatases are important. A differential display strategy revealed 11 distinct tyrosine phosphatases in the oligodendrocyte lineage, with both precursor cells and oligodendrocytes expressing four major phosphatase transcripts: PTP alpha, PTP zeta, PTP sigma, and PTP gamma. A majority of the phosphatases examined show an increase in their mRNA levels during differentiation, with a striking upregulation observed for PTP epsilon. Our results suggest a significant role for this class of signal transducers in oligodendrocyte differentiation.


Subject(s)
Oligodendroglia/cytology , Oligodendroglia/enzymology , Protein Tyrosine Phosphatases/metabolism , Animals , Cell Differentiation/drug effects , Cell Differentiation/physiology , Cytosol/enzymology , Nerve Tissue Proteins/biosynthesis , Nerve Tissue Proteins/metabolism , Oligodendroglia/chemistry , Phosphorylation , Phosphotyrosine/analysis , Phosphotyrosine/metabolism , Protein Tyrosine Phosphatases/biosynthesis , Rats , Receptor-Like Protein Tyrosine Phosphatases, Class 5 , Subcellular Fractions/chemistry , Tyrosine/physiology , Vanadates/pharmacology
18.
Dev Biol ; 170(1): 62-74, 1995 Jul.
Article in English | MEDLINE | ID: mdl-7601315

ABSTRACT

The heat shock response in Xenopus laevis has been reported to be developmentally regulated at the transcriptional level. We find that the heat shock response of an exogenous Xenopus hsp70 gene introduced into Xenopus oocytes, embryos, and somatic cells is dependent on the transcriptional assay conditions employed. Under conditions of efficient chromatin assembly, transcription from the Xenopus hsp70 gene promoter is repressed in oocytes and embryos, yet the promoter responds to heat shock by activating transcription. Under conditions of inefficient chromatin assembly, the Xenopus hsp70 gene is constitutively active in oocytes and somatic cells. Our results resolve previous controversy concerning the existence of a heat shock response for the hsp70 promoter in oocytes and illustrate the importance of considering chromatin assembly as a contributory factor in reconstructing the developmental control of gene expression.


Subject(s)
Chromatin/physiology , Gene Expression Regulation , HSP70 Heat-Shock Proteins/biosynthesis , Oocytes/metabolism , Transcription, Genetic , Xenopus laevis/metabolism , Animals , Base Sequence , Cell Line , Chromatin/ultrastructure , DNA/genetics , DNA, Single-Stranded/genetics , Embryo, Nonmammalian/metabolism , Female , Gene Expression Regulation, Developmental , HSP70 Heat-Shock Proteins/genetics , Hot Temperature , Microinjections , Molecular Sequence Data , Promoter Regions, Genetic , Regulatory Sequences, Nucleic Acid , Transfection , Xenopus laevis/embryology
19.
Indian J Exp Biol ; 33(1): 44-7, 1995 Jan.
Article in English | MEDLINE | ID: mdl-9135675

ABSTRACT

Delta opioid receptors were immunohistochemically mapped in the rat brain with anti-idiotypic antibodies to anti-leucine enkephalin specific for the receptor. Regions of highest receptor binding were in the cerebral cortex and caudate putamen Lower receptor binding was mapped to the hypothalamus and claustrum.


Subject(s)
Brain Chemistry , Receptors, Opioid, delta/analysis , Animals , Immunohistochemistry , Male , Rats
20.
J Biol Chem ; 269(40): 24699-705, 1994 Oct 07.
Article in English | MEDLINE | ID: mdl-7929143

ABSTRACT

We report here the detailed analysis of the promoter of a thyroid hormone receptor (TR) gene that is regulated by the hormone itself. The receptor gene, TR beta A, is one of the two TR beta genes in Xenopus laevis. It has two transcription start sites. The mRNAs derived from one of them are up-regulated by thyroid hormone, whereas those derived from the other are independent of the hormone. We have characterized the hormone-inducible promoter using a transient transfection assay in a Xenopus tissue culture cell line (A6). Deletion and mutational analysis identifies the first amphibian thyroid hormone response element (TRE). This TRE consists of near perfect direct repeats of AGGTCA with a 4-base pair spacing similar to mammalian TREs. The TRE forms specific complexes with extracts of A6 cells that have similar sequence specificities as those found for the complexes between mammalian TRs and TREs. However, unlike TREs found in other thyroid hormone-inducible promoters, this TRE is located at the putative transcription start site and mediates transcriptional repression by unliganded TRs. The addition of thyroid hormone at physiological concentrations overcomes the repression and induces further transcriptional activation at higher concentrations. These results suggest a potential mechanism for the regulation of amphibian metamorphosis, a process that is entirely controlled by thyroid hormone.


Subject(s)
Gene Expression Regulation , Promoter Regions, Genetic , Receptors, Thyroid Hormone/genetics , Thyroid Hormones/pharmacology , Xenopus laevis/metabolism , Animals , Base Sequence , Cloning, Molecular , Exons , Metamorphosis, Biological , Molecular Sequence Data , Transcription, Genetic
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