• Users Online: 134
  • Print this page
  • Email this page
Export selected to
Reference Manager
Medlars Format
RefWorks Format
BibTex Format
  Most popular articles (Since August 28, 2018)

  Archives   Most popular articles   Most cited articles
Hide all abstracts  Show selected abstracts  Export selected to
  Viewed PDF Cited
Ce 3+ Sensitized YPO 4 :Tb 3+ as Luminescent Probe for Selective Detection of Cu 2+ Ions
Naorem Shanta Singh, Ranjoy Wangkhem, Mehnaz Akhter Ahmed
October 2018, 5(2):74-89
Poly (acrylic acid) (PAA) modified water dispersible Ce 3+ (5 at.%) sensitized YPO 4 doped with Tb 3+ (5 at.%) nanocrystals were prepared by polyol method. Structural characterization was thoroughly studied with X-ray diffraction (XRD). Transmission electron microscopy (TEM) image indicate the rod shape morphology of the synthesized material. Fourier transform infrared (FTIR) spectroscopy confirms the surface functionalization of these nanorods. The sample shows the occurrence of strong energy transfer from Ce 3+ ions to Tb 3+ ions. The emission from Tb 3+ ions (green colour) could be selectively quenched with the addition of Cu 2+ ions upto ~89% compared to many of the heavy metal ions. It is established from the investigation the sensing is through dynamic quenching via resonance type energy transfer. The limit of detection calculated using Stern-Volmer relation is found to be 19 μM (~ 1 ppm). This nanophosphor could be a potential luminescent probe for Cu 2+ ions sensing.
[ABSTRACT]   Full text not available  [PDF]
  501 119 -
Sudeshna Chandra
October 2018, 5(2):52-53
Full text not available  [PDF]  [Mobile Full text]  [EPub]
  455 116 -
Surfactant Modified Graphene Oxide for the Detection of Dopamine
Diptesh Naik, Bhanudas Naik, Akshay Salkar, Vrushali S Joshi
October 2018, 5(2):64-73
A synthesis and characterization of a surfactant functionalize graphene oxide, and its potential applications for biosensor are presented. Graphene oxide was prepared using improved Hummer's method and modified with two different surfactants viz. cetyltrimethylammonium bromide (CTAB) and Sodium dodecyl sulfate (SDS) by chemical method. The formation of the product was confirmed by characterizing it with UV-Viz, IR spectroscopy and Scanning electron microscopy (SEM). Here, we report simple and low cost method to develop electrochemical dopamine sensor by drop-casting catalysts on graphite rod conducting phase. A developed sensor is used for the voltammetric detection of the micro - millimolar quantity of dopamine without any fouling of electrode surface. The kinetics of electron transfer in the dopamine oxidation reaction on the surface of a catalysts are investigated.
[ABSTRACT]   Full text not available  [PDF]  [Mobile Full text]  [EPub]
  452 114 -
Niosomes as Transdermal Drug Delivery System
Amruta Parmar, S Brijesh
October 2018, 5(2):54-63
Full text not available  [PDF]  [Mobile Full text]  [EPub]
  439 123 -
Odontogenic Fibroma of Maxilla: A Rare Clinical Entity
Shashikant A Pol, Arjun Dass, Nitin Gupta
October 2018, 5(2):90-94
The odontogenic fibroma (OF) is a rare benign tumour of mesodermal origin characterized by varying amounts of inactive looking odontogenic epithelium embedded in a mature, fibrous stroma. The lesion appears frequently involving the anterior region, when fibroma occurs in the maxilla, whereas they tends to be located in the posterior area, involving the premolar and molar areas, when fibroma occurs in the mandible. We are presenting a case of 36 year old female patient who had cheek swelling and facial disfigurement for 1 year. Biopsy was suggestive of odontogenic tumor. Complete excision was done transorally with sublabial approach and was histopathologically called out as benign odontogenic tumour consistent with an Odontogenic Fibroma. Patient was asymptomatic till 6 months of followup. Desmoplastic fibroma and intra-osseous fibrogenic myxoma should be considered in the differential diagnosis. The tumour should be managed conservatively with enucleation and curettage.
[ABSTRACT]   Full text not available  [PDF]  [Mobile Full text]  [EPub]
  441 102 -
Klotho: An emerging factor in neurodegenerative diseases
Gauri V Pathare, Kavita K Shalia
January 2019, 6(1):1-6
Soluble Klotho protein is present in blood, urine, and cerebrospinal fluid and works as a humoral factor exerting different biological effects. Several animal studies have demonstrated the association of age-related neurodegeneration with Klotho deficiency. Lower Klotho levels have been reported in patients suffering from cognitive impairment, dementia, Alzheimer's disease, Parkinson's disease, multiple sclerosis, and other neurodegenerative diseases. Due to its antiaging properties, Klotho is the obvious choice to be studied as a protective/therapeutic agent in neurobiology. In this review, we have attempted to shed light on the different neurodegenerative diseases affected by deficiency of Klotho and its neuroprotective role against pathogenicity of the disease.
  442 60 -
Evaluation of housekeeping genes for studies in breast cancer cell lines treated with progesterone
Aniket Parab, Jaykumar Kambli, Sujata Hake, Narendra Joshi
April 2018, 5(1):6-21
Real-time semi-quantitative PCR (qPCR) is extensively used to assess variations in gene expressions resulting from pathological conditions or biological responses. Normalization of qPCR data is required to control innate variations that occur during experimental procedures. Endogenous control genes (ECs), used for normalization of the data should be expressed constitutively and consistently across treatments groups. The aim of the present study was to identify the most suitable endogenous control genes for qPCR based analyses to study responses in breast cancer cell lines following exposure to Progesterone (P4). The expression and validity of five candidate ECs (PUM1, RPS13, RPL13A, TBCA and PSMB) were determined in three breast cancer cell lines following exposure to Progesterone. Gene expression data was analyzed using three methods, Normfinder, Bestkeeper, and Comparative delta Ct method. A significant difference in variance of expression levels of individual ECs under different growth conditions was observed. Expression of PUM1 and PSMB was minimally affected in breast cancer cell lines under the experimental conditions. Indeed, in the progesterone treated cells,PUM1 and PSMB were identified as the most stable EC genes by all three methods while TBCAand RPS13 were least stable. In breast cancer cell lines, our results highlight PSMB as another stably expressed endogenous control gene besides the previously identified PUM1. PSMB gene expression may thus provide an additional parameter for studies in breast cancers.
[ABSTRACT]   Full text not available  [PDF]
  325 123 -
Molecular docking study for evaluation of neuroprotective potential of sericin against cerebral stroke and exploring its biomaterial properties
Khushboo Maurya, Anand Kumar Pandey
January 2019, 6(1):17-24
Background: Cerebral stroke, the third leading cause of death worldwide results from the improper blood supply to the brain due to occlusions in the brain arteries. This leads to production of free radicals contributed by cyclo-oxygenases (COX), acid sensing ion channels (ASIC) and matrix metalloproteinases (MMPs) causing adverse conditions of inflammation, oxidative stress, and acidosis leading to neuronal death thereby proving these enzymes as potent targets. Sericin, a 38 amino acid long protein found in silk fiber is known for its anti-inflammatory and anti-oxidant property. Aim and Objectives: Inhibition of the above-mentioned targets by silk protein sericin to reduce the pathological features by structural interactions as well as reducing inflammation and oxidative stress due to the natural properties of compound. Methodology: In the present study we studied structural inhibition of effective targets by sericin through molecular docking analysis. Also, the semi crystalline nature of sericin was deduced through in silico XRD spectral analysis. Result: Structural inhibition through molecular docking analysis proved highly efficient inhibition. Also, the in silico XRD spectral analysis proved sericin to be a potential biomaterial for scaffold development. Conclusion: Sericin can not only act as an effective drug against cerebral ischemia but can also be used to develop scaffold to repair damaged brain.
  340 65 -
Estimation of epidemiological parameters for historicalm ship outbreaks of influenza
Praveen Kumar, Anjali Kshirsagar, Pratip Shil
April 2018, 5(1):28-38
Periodic Influenza epidemics are a cause of concern world-wide due to heavy burden of disease consequently leading to economic distress mortality. In modern era, rapid international travel between populations makes the impact of air-borne diseases like Influenza more dramatic, as observed in the last pandemic due to Swine origin Influenza A/H1N1 2009. Though transmission of Influenza in humans has been studied in various settings, studies on ship outbreaks are sparse. The current research aims to analyze the historical Influenza outbreaks on sailing ships. Study revealed the pattern of transmission in isolated population and estimates the epidemiological parameters viz. basic reproduction number (R0), epidemic growth rate (r), transmission rate (β). High clustering lead to intense transmission with 0 high value of basic reproductive number, R0. Also, the study brought to light the limitations of analyzing 0 historical data.
[ABSTRACT]   Full text not available  [PDF]
  272 100 -
Telomere length maintenance mechanisms in cancer
Ekta Khattar
April 2018, 5(1):22-27
[ABSTRACT]   Full text not available  [PDF]
  244 113 -
Stability-indicating HPLC method for primaquine diphosphate: An application to niosomal formulation
Miloni Thakkar, S Brijesh
April 2018, 5(1):39-51
A novel, rapid, and precise stability-indicating gradient reverse-phase high performance liquid chromatographic method for the quantitative determination of primaquine diphosphate and its impurities was developed and validated. Efficient chromatographic separation was achieved on an Inertsil ODS-3V column (150 mm × 4.6 mm, 5.0 μm) with mobile phase containing phosphate buffer (0.05 M KH2PO4, pH 4.5) in gradient combination with acetonitrile at a flow rate of 1 mL/min and the analyte was monitored using a photo-diode array detector at a wavelength of 254 nm. The forced-degradation of primaquine diphosphate was carried out by exposing it to acidic, basic, neutral, thermal, photolytic, and oxidative stress conditions. The peaks of the degradation products obtained were well resolved from that of primaquine diphosphate, indicating that the method developed was specific and stability-indicating. Further, the method was validated according to the International Conference on Harmonization of Technical Requirements for Registration of Pharmaceuticals for Human Use guidelines, with respect to parameters such as specificity, precision, linearity, accuracy and robustness. The developed method could also be used for the quantification of primaquine diphosphate encapsulated in niosome formulation.
[ABSTRACT]   Full text not available  [PDF]
  255 94 -
Nitrate stress-induced bioactive sulfated polysaccharides from Chlamydomonas reinhardtii
Jyoti Vishwakarma, Vaishnavi Parmar, Sirisha L Vavilala
January 2019, 6(1):7-16
Sulfated polysaccharides (SPs) are anionic carbohydrate polymers synthesized as extracellular or cell wall components by most of the algae and have potent bioactive properties. In the current study, Chlamydomonas reinhardtii (Cr) cells were attributed to sodium nitrate stress in concentrations such as 5 mM, 10 mM, 20 mM, 30 mM, and a control to determine the productivity and bioactivity of SPs. SPs are extracted by hot water method using 80% ethanol. The percentage yield of SPs increased with an increase in concentration of sodium nitrate as compared to control. Biochemical analysis of the extract showed an increase in carbohydrate content (22%–95%), uronic acid content (23%–60%), and sulfate content from control to 30 mM NaNO3-treated extracts. The amount of reducing and nonreducing sugars was found to be 6.16% and 89.06%, respectively, while the protein content is ~16%. The antioxidant potential of SPs showed increased antioxidant activity with an increase in concentration of NaNO3 stress. The analysis resulted in maximum chelating activity of 83.73% assayed in concentration range of 1–8 μg/ml, total antioxidant activity of 70.36% in concentration 0.05–2μg/ml, and hydroxyl radical scavenging activity of 79.52% in concentration 250–1000 μg/ml; reducing potential was observed with the highest absorbance of 0.87; the 2,2-diphenyl-1-picrylhydrazyl scavenging activity showed the highest activity of 63.61%, while the superoxide scavenging activity was 92% at 0.1–1 μg/ml. Furthermore, Cr-SPs inhibited the growth of Gram-positive Staphylococcus aureus and Gram-negative Escherichia coli bacterial growth as indicated by clear zones that increased in size with an increasing concentration of NaNO3. These results provide opportunities to develop Cr-SPs as natural antioxidant and antibacterial agents.
  278 58 -
Breast/cervical cancers: Issues at stake
Dhananjaya Saranath, Aparna Khanna
April 2018, 5(1):1-5
Full text not available  [PDF]
  197 110 -
Transforming growth factor beta receptor 2 single-nucleotide polymorphism association with oral cancer and In silico identification of small drug-like molecules as inhibitors to transforming growth factor Beta-2 receptor
Shaleen Multani, Hetal Damani Shah, Dhananjaya Saranath
January 2019, 6(1):25-33
Objective: Oral cancer, in India, constitutes 26% of global oral cancer burden. The major risk factors include tobacco, areca nut, alcohol, and human papillomavirus 16/18; however, only 5%–10% of the high-risk individuals develop oral cancer, indicating the role of genomic variants in susceptibility to oral cancer. Conventional treatment options in oral cancer have resulted in relatively poor prognosis and an unmet need of treatment. In silico analysis, therefore, was performed to identify small drug-like molecules as potential inhibitors of transforming growth factor beta-2 receptor (TGFβRII). Materials and Methods: Seven single-nucleotide polymorphisms (SNPs) were analyzed in 500 histopathologically confirmed oral cancer samples and 500 long-term tobacco users (LTTUs) as controls using allelic discrimination real-time polymerase chain reaction or high-resolution melting analysis. The differential frequencies in oral cancer and LTTUs were calculated using SPSS software (version 19), and odds ratio (OR) to indicate risk to oral cancer using Hutchon.net. structure-based virtual screening of drug-like molecules was performed to identify lead inhibitor molecules to TGFβRII using Schrödinger Suite 2015-4. Results: Heterozygous GC genotype of TGFBR2 rs9843143 demonstrated increased risk ([P = 0.011; OR 1.61 [1.25–2.1]) while CC genotype showed decreased risk (P = 0.005; OR 0.61 [0.44–0.83]) to oral cancer. Increased/decreased risk to oral cancer was not observed for the other SNPs. In silico analysis identified six molecules as inhibitors of TGFβRII kinase domain from 17,723 conformers from Maybridge HitFinder library and 2685 conformers from MEGx AnalytiCon natural product library. Conclusion: SNP rs9843143 (TGFBR2) demonstrated a significant association (P < 0.05) with oral cancer and six potential inhibitors of TGFβRII kinase were identified using in silico analysis.
  263 43 -
Visual inspection with acetic acid as a screening test for cervical cancer
Srabani Mittal, Jaydip Biswas, Partha Basu
April 2014, 1(1):23-33
Visual inspection with acetic acid (VIA) has been extensively investigated and accepted as potential alternative to cytology or Human Papilloma Virus (HPV) screening in limited resource settings. In developing countries, VIA may have several advantages over cytology or HPV screening. The consumables of the test are low-cost and readily available. VIA has potential of achieving large population coverage, as the test can be performed by a wide range of trained health care personnel and requires basic health infrastructure. It is a real-time test and offers logistic advantage of providing treatment for screen positive women during the same visit leading to high treatment coverage. The sensitivity and specificity estimates of VIA generally fall within the range of those reported for cytology and HPV testing. Randomized controlled trials evaluating test performance of VIA have demonstrated reduction in cervical cancer incidence and mortality in study population. The major limitation of VIA is that it is a subjective test and accuracy is dependent on the skill of trained providers. Low specificity and sub-optimal positive predictive value results in unnecessary referrals and/or treatment which can offset the perceived low cost of the test. VIA based screening programs are required to have clearly defined measurable indicators and a framework to identify the program strengths and weaknesses. Quality assurance of VIA is challenging specially because there is limited information on the test performance in multi-provider real programmatic setting. High quality training, periodic refresher courses, expertise of trained providers and close monitoring of performance indicators are required to ensure good quality VIA.
[ABSTRACT]   Full text not available  [PDF]
  219 55 -
Determination of hyperglycaemia-induced epc dysfunction using a panel of cellular assays: Validation of experimental murine and human model systems
Kadambari Dixit, Meghana Kanitkar, Sheetal Kadam, Rucha Deshpande, Vaijayanti Kale
April 2017, 4(1):82-101
Although human and murine Endothelial Progenitor Cells (EPCs) are routinely used for research, the results can only be imperfectly analyzed due to our limited understanding of source-specific differential responses to stress. Although the routinely used cellular and functional assays are effective for detection of EPC dysfunction (EPD) in single source test systems, there is lack of a universal detection system capable of detecting high glucose (HG) and/or Diabetes mellitus (DM)-induced EPD irrespective of source or site. To remedy this lacuna we compared the test systems from both cell sources. Comparison of sensitivity of various cellular assays revealed that of all the assays performed, only colony formation assays (CFU) showed comparable responses to diabetes/high glucose in both test systems, while cell adhesion assay (CAA), proliferation potential and viability differed in their responses to HG. On the other hand, the functional assays i.e. tubule formation, chemotactic migration assay and CXCR4 and VEGFR2 mRNA expression were uniformly affected by HG in vitro and DM in vivo. Interestingly, other parameters studied i.e. nitric oxide, reactive oxygen species (ROS) and manganese superoxide dismutase (MnSOD) showed dissimilar responses to HG and DM exposure. On this basis, we propose a panel of assays comprising CFU, tubule formation, chemotactic-migration and CXCR4 and VEGFR2 mRNA expression that can accurately detect HG-/DM-induced EPD irrespective of various systemic factors. These assays will also enhance uniformity across data sets and increase accuracy of EPD detection in human and murine systems.
[ABSTRACT]   Full text not available  [PDF]
  207 51 -
Physiology of embryo-endometrial cross talk
Deepak N Modi, Pradeep Bhartiya
April 2015, 2(1):83-104
Implantation of the blastocyst stage embryo into the maternal endometrium is a critical determinant and a rate-limiting process for successful pregnancy. Embryo implantation requires synchronized changes in the endometrium before and after arrival of blastocyst into the uterine cavity. Extensive cross talks occur between the fetal and maternal compartments around the time of implantation which are reflected by morphologic, biochemical and molecular changes in the endometrial cells and the differentiating trophoblast cells. The embryo induced morphologic changes include occurrence of epithelial plaque reaction, stromal compaction and decidualization. Embryonic signals also alter the expression of a large number of transcription factors, growth factors and their receptors and integrins. Thus the embryo superimposes a unique signature on the receptive endometrium for successful implantation. Functionally, the embryo-endometrial cross talk is essential for endowing a “selector activity” to the receptive endometrium to ensure implantation of only a developmentally competent embryo. On selection, the decidua creates a conducive microenvironment for trophoblast invasion leading to placentation. Clinical evidences suggest that along with receptivity, a defective “selector” activity of the receptive uterus may be a cause of infertility and recurrent miscarriages. Defects in trophoblast invasion are associated with pregnancy complications like preeclampsia and intra-uterine growth retardation. It is envisaged that understanding of the embryo-endometrial dialogue leading to the “selector” activity, aids in development of appropriate therapeutic modalities for infertility related disorders and miscarriages. Conversely, it might also benefit the development of anti-implantation drugs for contraception.
[ABSTRACT]   Full text not available  [PDF] [CITATIONS]
  219 37 4
Oral feeding with Arachidonic Acid (AA) and Docosahexanoic Acid (DHA) help in better recovery of haematopoiesis in sub-lethally irradiated mice
Kedar Limbkar, Vaijayanti Kale, Lalita Limaye
October 2016, 3(2):182-194
Haematopoiesis is severely hampered after exposure to ionizing radiations. Role of polyunsaturated fatty acids (PUFAs) during embryonic development as well as during various physiological processes is well established. However, few studies on their effect on haematopoiesis are reported. Hence, we studied the effect of oral administration of PUFAs-AA/DHA on haematopoiesis of sub-lethally irradiated mice. To determine the optimal dose for haematopoiesis, non-irradiated healthy mice were orally fed with different doses of AA/DHA daily for ten days. Additionally, mice were sub lethally irradiated and kept for ten days on normal diet. Further, sub-lethally irradiated mice were orally fed with optimal dose of AA/DHA for ten days. Mice from the experiments were sacrificed after ten days and their bone marrow cells were harvested and analyzed for their total nucleated cell (TNC) count, side population (SP) and lin-Sca-1+c-kit+(LSK) phenotype. Peripheral blood collected from this set of mice was subjected to hemogram analysis. Daily dose of 8 mg AA/DHA for ten days was assessed as optimal for enhancing BM-MNCs and primitive HSCs in non-irradiated mice. Significant depletion in BM-MNCs, SP and LSK cells was observed in sub lethally irradiated mice compared to un-irradiated control mice. Feeding with DHA or AA in sub lethally irradiated mice showed significantly higher number of BM-MNCs and increased percentage of SP and LSK cells, suggesting that DHA and AA resulted in better recovery of hematopoietically compromised mice. The data indicated that DHA or AA may serve as useful dietary supplements in patients exposed to irradiation.
[ABSTRACT]   Full text not available  [PDF]
  200 53 -
Mathematical modeling of viral epidemics: A review
Pratip Shil
October 2016, 3(2):195-215
Mathematical models to describe transmission and propagation of diseases have gained momentum over the last hundred years. Formulated mathematical models are currently applied to understandthe epidemiology of various diseases including viral diseases viz Influenza, SARS, measles, etc. With the emergence of advanced computing tools, designing mathematical models and generating simulations (numerical solutions) have become feasible. There is an enormous scope for using mathematical models in studying epidemiology of viral diseases through transmission dynamics of outbreaks and in evaluating or predicting the effects of interventions and vaccinations. The influenza pandemic of 2009 and the recent Ebola epidemics of 2014-15 have generated renewed interest in mathematical modelling of epidemics. Here we present a review of the various mathematical models and their applications in the study of virus driven epidemics.
[ABSTRACT]   Full text not available  [PDF]
  206 47 -
Clusterin in cancer: Dual role as a tumor suppressor gene and an oncogene
Rajashree Kadam, Tanuja Teni
October 2016, 3(2):130-156
Clusterin (CLU), a heterodimeric and sulfated glycoprotein has been associated with various physiological functions. This molecular chaperone protein is ubiquitously expressed in diverse tissues and conserved across species. Differences in subcellular localization and possible existence of different CLU isoforms may contribute to its functional diversity. Increased or decreased expression of CLU has been observed in several cancers versus normal tissues and hence its role in tumorigenesis is controversial. Evidences from several studies imply that CLU may have a dual role as a tumor suppressor gene or an oncogene depending on the signal and cellular context. CLU possibly exerts its oncogenic role by inhibiting apoptosis, activating autophagy and modulating several signaling pathways like IGF-1/IGFR, EGFR, NF-kB, PI3K/AKT, TGFp and select miRNAs. CLU may exert its tumor suppressive effects by regulating cell cycle and inducing apoptosis. In cancer, loss of heterozygosity (LOH), copy number loss at CLU locus, epigenetic modifications and expression of select miRNAs may lead to the downregulation of CLU. Custirsen (OGX-011), a second generation antisense oligonucleotide that inhibits CLU expression and increases sensitivity of cancer cells to chemotherapeutic drugs, is currently in phase III clinical trials. CLU is an attractive target in several cancers, however for effective targeting, it is essential to know whether it acts as an oncogene or a tumor suppressor gene in a specific tissue/cellular context. The current review attempts to discuss the two contrasting roles of CLU in cancer and associated regulatory mechanisms. This review also sheds light on the complex CLU splice variants, the varied functional attributes supporting the dual roles in cancer and limitations of the CLU research that warrant attention.
[ABSTRACT]   Full text not available  [PDF]
  203 49 -
Metastatic hepatocellular carcinoma manifesting as primary esophageal carcinoma: A rare case report
K Jayaprakash Shetty, HL Kishan Prasad, Shubha Bhat, Michelle Mathias, Vijith Shetty
January 2019, 6(1):34-36
Hepatocellular carcinoma (HCC) metastasizing to the esophagus and mimicking as a primary tumor of the esophagus is extremely rare, being present in <0.4% in some autopsy series. This report describes a case of 70-year-old male with metastatic HCC to esophagogastric junction causing diagnostic dilemma. An endoscopic examination revealed an ulcerative lesion in the lower end of the esophagus. The biopsy specimen obtained from a tumor revealed the pseudoglandular arrangement of tumor cells. Ultrasound abdomen showed liver nodule with biopsy confirming as HCC. Immunohistochemistry (IHC) of the esophageal mass showed positivity for Hep par 1, Glypican-3, Arginase, CA 19-9, CK 19, CDX2, pCEA, SATB2, and Ki-67 having 70% positivity confirming the HCC. Among these IHC panels, all are specific markers of HCC, but CDX2 and SATB2 were aberrantly expressed in our case. He was started on six cycles of chemotherapy (apristar 125 mg, epirubicin 40 mg, oxaliplatin 100 mg, and capecitabine 500 mg). After 8 months of follow-up, he was symptomatically improved. However, later, the patient was lost to follow-up. The accurate pretreatment staging and then providing stage-appropriate treatment is crucial in optimizing esophageal and hepatocellular cancer outcomes. Cases of premortem-diagnosed esophageal metastasis from HCC are extremely rare. Our case was ideal for IHC, which plays an important role in arriving at proper cases. Furthermore, it confirmed and highlighted the rare manifestations of hepatocellular carcinoma.
  208 38 -
Therapy induced senescence and its implications in cancer
Jyothi Nair, Poorvaja Muley, Shilpee Dutt
April 2017, 4(1):28-48
Senescence is a phenomenon of ‘end of cells replicative capacity’, characterized by irreversible cell cycle arrest which in the context of cancer, will contain the growth of tumour. Hence possibility of using pro-senescence therapies for cancer therapeutics has generated substantial interest. In this regards there are several reports showing that senescence can be induced in cancer cells by genotoxic agents used in anti-neoplastic therapy, such senescence is called ‘therapy induced senescence’ (TIS). Therapy induced senescent cells undergo cell death or eventual immune-mediated clearance. However, recent reports also show the existence of ‘therapy induced senescence reversal’ mechanisms in some cancers, wherein after a definite period of time, senescent cells overcome the arrest and re-enter the cell cycle, eventually repopulating the tumour which will limit the use of senescence for cancer therapeutics. The data also highlighs that TIS is complex and we do not fully understand many aspects of this phenomenon. Therefore to harness senescence for cancer therapeutics, a deeper understanding of the underlying molecular mechanisms governing establishment and reversal of senescence is required. In the current review, we have discussed current knowledge of the therapeutic agents inducing senescence, their mechanism of induction and the implication of senescence reversal in cancers.
[ABSTRACT]   Full text not available  [PDF]
  195 46 -
Human EGFR-2, EGFR and HDAC triple-inhibitor CUDC-101 enhances radiosensitivity of GBM cells
Cody D Schlaff, W Tristram Arscott, Ira Gordon, Kevin A Camphausen, Anita Tandle
April 2015, 2(1):105-119
Radiotherapy remains the standard treatment for glioblastoma multiforme (GBM) following surgical resection. Given the aberrant expression of human epidermal growth factor receptor 2 (HER2) and epidermal growth factor receptor (EGFR) which may play a role in therapeutic resistance to receptor tyrosine kinase inhibitors, and the emerging use of histone deacetylase (HDAC) inhibitors as radiosensitizers, we defined the effects of CUDC-101, a triple inhibitor of HER2, EGFR and HDAC on the radiosensitivity of GBM cells. Clonogenic survival was used to determine the in vitro radiosensitizing potential of CUDC-101 on GBM, breast cancer, and normal fibroblast cell lines. Inhibitory activity was defined using immunoblots and DNA double strand breaks were evaluated using yH2AX foci. Effects of CUDC-101 on cell cycle and radiation-induced cell kill were determined using flow cytometry and fluorescent microscopy. CUDC-101 inhibited HER2, EGFR and HDAC and enhanced in vitro radiosensitivity of both GBM and breast cancer cell lines, with no effect on normal fibroblasts. Retention of yH2AX foci was increased by CUDC-101 alone and in combination with irradiation for 24 h. Treatment with CUDC-101 increased the number of cells in G2 and M phase, with only increase in M phase statistically significant. An increase in mitotic catastrophe was seen in a time-dependent fashion with combination treatment. The results indicate the tumor specific CUDC-101 enhanced radiosensitization in GBM, and suggest that the effect involves inhibition of DNA repair.
[ABSTRACT]   Full text not available  [PDF]
  187 51 -
Polycomb group proteins: Emerging players in neurogenesis
Divya Desai, Niloufer Dumasia, Prasad Pethe
October 2017, 4(2):122-136
Neural development is a multi-factorial process, one that is governed by several interconnected factors. Fate of neural progenitor cells is determined by an intricate interplay between developmental genes, promoters, transcription factors, and epigenetic modifiers that act as transcription activators or silencers. Gradients of signalling molecules such as - SONIC HEDGEHOG, Retinoic Acid, BMP4, WNT and NOGGIN are generated during development and differentiat on, these bind to their cognate receptors leading to activation or repression of specific genes necessary for differentiation. Silencing of nonlineage sp cific genes is a key factor in maintaining the identity of a cell during subsequent proliferation and maturation post gastrulation. Gene silencing or repression of genes can be carried out by nucleotide modifications (cytosine methylation), histone modifications (acetylation, methylation, phosphorylation and ubiquitylation) and/or heterochromatization. Histone modifiers such as Polycomb Group proteins (PcGs), Histone Acetyltransferases (HAT), Histone Deacetylases (HDAC) regulate gene expression in early development as well as play an important role in adult organism. Polycomb Group proteins (PcGs) bring aboutgene repression by catalysing histone modifications such as di- and trimethylation on histone H3 (H3K27me2 and H3K27me3) and mono-ubiquitylation of histone H2A (H2AK119Ub) at the promoters of specific genes. In this review, we would discuss the activity of Polycomb group (PcG) proteins in neurogenesis, their role in histone modification and silencing of key development genes to bring about precise development and differentiation.
[ABSTRACT]   Full text not available  [PDF]
  195 43 -
Biomagnetic interaction of functionalized iron oxide nanoparticles with bovine serum albumin
Mayank Gupta, Sudeshna Chandra
October 2016, 3(2):229-240
Functionalized iron oxide (magnetic) nanoparticles are promising candidate for detection and sensing of target molecule as they can be manipulated and detected through magnetic interactions. The biological recognition moiety of the functionalized coating results in binding of the target analyte which causes a change in the interaction of the nanoparticles under the influence of an external magnetic field. This forms the basis of the fabrication of a bio-magnetic sensor. The current study reports the use of three different macromolecules viz. glycol chitosan (GC), poly ethylene glycol methyl ether (PEGME) and poly sodium stereo-4 sulphate (PSSNa) to functionalize and cap the magnetic nanoparticles. The magnetic nanoparticles were characterized using FTIR, XRD, TEM and TGA to evaluate their structural and surface properties. TEM showed spherical nanoparticles with mean size of ~11, 12 and 13 nm for GC, PEGME and PSSNa-MNPs respectively. TGA evaluates the weight loss of the modified MNPs and confirms the coating on the surface of the MNPs. Bovine serum albumin (BSA) was immobilized on the functionalized MNPs and detection studies were carried out using AC susceptibility studies on a physical property measurement system. Detection of BSA immobilized MNPs was exhibited at 300 K by the measurement of the imaginary part of the magnetic susceptibility over a frequency range and is based on the changes of dynamic magnetic properties of the MNPs, making use of the Brownian relaxation.
[ABSTRACT]   Full text not available  [PDF]
  194 40 -