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1.
J Cell Physiol ; 236(2): 763-770, 2021 02.
Artigo em Inglês | MEDLINE | ID: mdl-32697344

RESUMO

The emergence of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the agent of novel coronavirus 2019 (COVID-19), has kept the globe in disquiets due to its severe life-threatening conditions. The most common symptoms of COVID-19 are fever, sore throat, and shortness of breath. According to the anecdotal reports from the health care workers, it has been suggested that the virus could reach the brain and can cause anosmia, hyposmia, hypogeusia, and hypopsia. Once the SARS-CoV-2 has entered the central nervous system (CNS), it can either exit in an inactive form in the tissues or may lead to neuroinflammation. Here, we aim to discuss the chronic infection of the olfactory bulb region of the brain by SARS-CoV-2 and how this could affect the nearby residing neurons in the host. We further review the probable cellular mechanism and activation of the microglia 1 phenotype possibly leading to various neurodegenerative disorders. In conclusion, SARS-CoV-2 might probably infect the olfactory bulb neuron enervating the nasal epithelium accessing the CNS and might cause neurodegenerative diseases in the future.


Assuntos
COVID-19/complicações , Transtornos do Olfato/etiologia , SARS-CoV-2 , Animais , Humanos , Doenças Neurodegenerativas/etiologia
2.
J Cell Physiol ; 234(6): 8259-8273, 2019 06.
Artigo em Inglês | MEDLINE | ID: mdl-30370571

RESUMO

Biliary tract cancers (BTC) are aggressive tumours with a low survival rate. At the advent of the genomic era, various genetic mutations in cell signalling pathways have been incriminated in carcinogenesis. Genomic analysis studies have connected main components of the phosphoinositide-3-kinase (PI3K) signalling pathway to BTC. PI3K pathway playing a central role in cell signalling and being deregulated in various tumours has been studied as a target for chemotherapy. Novel compounds have also been identified in preclinical trials that specifically target the PI3K pathway in BTCs, but these studies have not accelerated to clinical use. These novel compounds can be examined in upcoming studies to validate them as potential therapeutic agents, as further research is required to combat the growing need for adjuvant chemotherapy to successfully battle this tumour type. Furthermore, these molecules could also be used along with gemcitabine, cisplatin and 5-fluorouracil to improve sensitivity of the tumour tissue to chemotherapy. This review focuses on the basics of PI3K signalling, genetic alterations of this pathway in BTCs and current advancement in targeting this pathway in BTCs. It emphasizes the need for gene-based drug screening in BTC. It may reveal various novel targets and drugs for amelioration of survival in patients with BTC and serve as a stepping stone for further research.


Assuntos
Neoplasias do Sistema Biliar/tratamento farmacológico , Terapia de Alvo Molecular , Fosfatidilinositol 3-Quinases/genética , Inibidores de Fosfoinositídeo-3 Quinase/uso terapêutico , Neoplasias do Sistema Biliar/genética , Neoplasias do Sistema Biliar/patologia , Cisplatino/uso terapêutico , Desoxicitidina/análogos & derivados , Desoxicitidina/uso terapêutico , Avaliação Pré-Clínica de Medicamentos , Fluoruracila/uso terapêutico , Humanos , Fosfatidilinositol 3-Quinases/efeitos dos fármacos , Transdução de Sinais/efeitos dos fármacos , Gencitabina
3.
Indian J Microbiol ; 54(2): 196-202, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25320422

RESUMO

This study reveals a green process for the production of multi-morphological silver (Ag NPs) and gold (Au NPs) nanoparticles, synthesized using an agro-industrial residue cashew nut shell liquid. Aqueous solutions of Ag(+) ions for silver and chloroaurate ions for gold were treated with cashew nut shell extract for the formation of Ag and Au NPs. The nano metallic dispersions were characterized by measuring the surface plasmon absorbance at 440 and 546 nm for Ag and Au NPs. Transmission electron microscopy showed the formation of nanoparticles in the range of 5-20 nm for silver and gold with assorted morphologies such as round, triangular, spherical and irregular. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analyses of the freeze-dried powder confirmed the formation of metallic Ag and Au NPs in crystalline form. Further analysis by Fourier transform infrared spectroscopy provided evidence for the presence of various biomolecules, which might be responsible for the reduction of silver and gold ions. The obtained Ag and Au NPs had significant antibacterial activity, minimum inhibitory concentration and minimum bactericidal concentration on bacteria associated with fish diseases.

4.
Mol Neurobiol ; 61(7): 4868-4878, 2024 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-38147229

RESUMO

Rett syndrome (RTT) is the rare neurodevelopmental disorder caused by mutations in methyl CpG binding protein 2 (MECP2) gene with a prevalence of 1:10,000 worldwide. The hallmark clinical features of RTT are developmental delay, microcephaly, repetitive behaviours, gait abnormalities, respiratory abnormalities and seizures. Still, the understanding on the diagnosis of RTT among clinicians are less. The aim of our work was to study various clinical manifestations and a spectrum of MECP2 genetic heterogeneity in RTT patients from South Indian population. We screened 208 autistic patients and diagnosed 20 RTT patients, who were further divided into classical RTT (group I; N = 11) and variant RTT (group II; N = 9). The clinical severity of RTT was measured using RSSS, RSBQ, SSI, SSS and RTT gross motor scale. The biochemical analysis showed that thyroid-stimulating hormone (TSH), plasma dopamine and cholesterol levels were higher in group I when compared to group II, whereas the level of blood pressure, calcium, ferritin and high-density lipoprotein levels were significantly decreased in both RTT groups, when compared to the control group. The genetic mutational spectrum of MECP2 mutations were found in 12/20 of RTT patients, which revealed the occurrence of 60% pathogenic mutation and 20% unknown mutation and it was correlated with the clinical finding of respiratory dysfunction, scoliosis and sleeping problems. The significant results of this study provided clinical and genetic aspects of RTT diagnosis and proposed the clinicians to screen abnormal cholesterol, calcium and TSH levels tailed with MECP2 gene mutations for early prognosis of disease severity.


Assuntos
Progressão da Doença , Proteína 2 de Ligação a Metil-CpG , Mutação , Síndrome de Rett , Humanos , Síndrome de Rett/genética , Feminino , Índia/epidemiologia , Proteína 2 de Ligação a Metil-CpG/genética , Criança , Mutação/genética , Pré-Escolar , Instabilidade Genômica/genética , Adolescente , Masculino , Adulto , Adulto Jovem
5.
Dig Dis Sci ; 58(3): 759-67, 2013 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-23053887

RESUMO

BACKGROUND: Hepatocellular carcinoma (HCC) is the second leading cause of cancer death in many regions of Asia and the etiology of human HCC is clearly multi-factorial. The development of effective markers for the detection of HCC could have an impact on cancer mortality and significant health implications worldwide. The subjects presented here were recruited based on the serum alpha-fetoprotein level, which is an effective marker for HCC. Further, the chromosomal alterations were elucidated using trypsin G-banding. HCCs with p53 mutations have high malignant potential and are used as an indicator for the biological behavior of recurrent HCCs. The functional polymorphism in the XRCC1 gene, which participates in the base-excision repair of oxidative DNA damage, was associated with increased risk of early onset HCC. Thus, in this investigation, the p53 and XRCC1 gene polymorphisms using the standard protocols were also assessed to find out whether these genes may be associated with HCC susceptibility. METHODS: Blood samples from HCC patients (n = 93) were collected from oncology clinics in South India. Control subjects (n = 93) who had no history of tumors were selected and they were matched to cases on sex, age, and race. Peripheral blood was analyzed for chromosomal aberrations (CAs) and micronuclei (MN) formation. p53 and XRCC1 genotypes were detected using a PCR-RFLP technique. RESULTS: Specific biomarkers on cytogenetic endpoints might help in diagnosis and treatment measures. The frequencies of genotypes between groups were calculated by χ(2) test. A statistically significant (p < 0.05) increase in CA was observed in HCC patients compared to their controls as confirmed by ANOVA and MN shows insignificant results. The study on p53 Arg72Pro and XRCC1 Arg399Gln polymorphism in HCC patients demonstrated differences in allele frequencies compared to their controls. CONCLUSIONS: The present study indicates that chromosomal alterations and the genetic variations of p53 and XRCC1 may contribute to inter-individual susceptibility to HCC. A very limited role of genetic polymorphism was investigated in modulating the HCC risk, but the combined effect of these variants may interact to increase the risk of HCC in the South Indian population.


Assuntos
Carcinoma Hepatocelular/genética , Dano ao DNA , Predisposição Genética para Doença , Neoplasias Hepáticas/genética , Polimorfismo Genético , Adulto , Carcinoma Hepatocelular/epidemiologia , Feminino , Genótipo , Humanos , Índia/epidemiologia , Neoplasias Hepáticas/epidemiologia , Masculino , Pessoa de Meia-Idade , Razão de Chances
6.
Arch Environ Contam Toxicol ; 64(4): 652-8, 2013 May.
Artigo em Inglês | MEDLINE | ID: mdl-23271343

RESUMO

The aim of this study was to assess the frequency of chromosomal aberrations-including chromatid type aberrations (CTAs), chromosomal type aberrations, micronucleus (MN) comet assay, and XRCC1 399 Arg/Gln polymorphism-in peripheral blood lymphocytes of workers occupationally exposed to vinyl chloride monomer (VCM). A total of 52 workers and an equal number of controls were recruited into the study to explore the potential cytogenetic risk of occupational exposure to VCM. Questionnaires were administered to obtain details of habitual cigarette-smoking, alcohol-consumption pattern, and occupation, etc. The exposed subjects and controls were classified into two groups based on age (group I <40 years; group II ≥40 years), and exposed subjects were further classified based on exposure duration (>8 and ≥8 years). CTA, MN, and comet assay frequency were significantly greater in polyvinyl chloride (PVC) factory workers (p < 0.05) with long-duration work. CTA, MN, and comet assay values were found to be increased with age in exposed subjects as well as in controls, with exposed subjects showing a statistically greater degree. An extensively greater MN frequency was observed in smokers exposed to VCM than in the control group (P < 0.05). The mean tail length of exposed subjects was greater compared with controls. The study on XRCC1 399 Arg/gln polymorphism in PVC factory workers showed less significant difference in allele frequency compared with controls. In conclusion, this results of work provides evidence for an apparent genotoxic effect associated with VCM exposure. Our results reinforce the greater sensitivity of cytogenetic assays for biomonitoring of occupationally exposed populations. Statistics indicate that workers exposed to VCM are at carcinogenic risk and should be monitored for long-term adverse effects from their exposure.


Assuntos
Poluentes Ocupacionais do Ar/toxicidade , Indústria Química , Aberrações Cromossômicas/induzido quimicamente , Monitoramento Ambiental , Mutagênicos/toxicidade , Cloreto de Vinil/toxicidade , Adulto , Poluentes Ocupacionais do Ar/classificação , Ensaio Cometa , Feminino , Humanos , Linfócitos/efeitos dos fármacos , Masculino , Testes para Micronúcleos
7.
Genes Dis ; 8(5): 629-639, 2021 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-34291134

RESUMO

Autism is a heterogeneous neurodevelopmental and neuropsychiatric disorder with no precise etiology. Deficits in cognitive functions uncover at early stages and are known to have an environmental and genetic basis. Since autism is multifaceted and also linked with other comorbidities associated with various organs, there is a possibility that there may be a fundamental cellular process responsible for this. These reasons place mitochondria at the point of interest as it is involved in multiple cellular processes predominantly involving metabolism. Mitochondria encoded genes were taken into consideration lately because it is inherited maternally, has its own genome and also functions the time of embryo development. Various researches have linked mitochondrial mishaps like oxidative stress, ROS production and mt-DNA copy number variations to autism. Despite dramatic advances in autism research worldwide, the studies focusing on mitochondrial dysfunction in autism is rather minimal, especially in India. India, owing to its rich diversity, may be able to contribute significantly to autism research. It is vital to urge more studies in this domain as it may help to completely understand the basics of the condition apart from a genetic standpoint. This review focuses on the worldwide and Indian scenario of autism research; mitochondrial abnormalities in autism and possible therapeutic approaches to combat it.

8.
Mitochondrion ; 60: 201-218, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-34454075

RESUMO

Leber's Hereditary Optic Neuropathy (LHON) is an inherited optic nerve disorder. It is a mitochondrially inherited disease due to point mutation in the MT-ND1, MT-ND4, and MT-ND6 genes of mitochondrial DNA (mtDNA) coding for complex I subunit proteins. These mutations affect the assembly of the mitochondrial complex I and hence the electron transport chain leading to mitochondrial dysfunction and oxidative damage. Optic nerve cells like retinal ganglion cells (RGCs) are more sensitive to mitochondrial loss and oxidative damage which results in the progressive degeneration of RGCs at the axonal region of the optic nerve leading to bilateral vision loss. Currently, gene therapy using Adeno-associated viral vector (AAV) is widely studied for the therapeutics application in LHON. Our review highlights the application of cell-based therapy for LHON. Mesenchymal stem cells (MSCs) are known to rescue cells from the pre-apoptotic stage by transferring healthy mitochondria through tunneling nanotubes (TNT) for cellular oxidative function. Empowering the transfer of healthy mitochondria using MSCs may replace the mitochondria with pathogenic mutation and possibly benefit the cells from progressive damage. This review discusses the ongoing research in LHON and mitochondrial transfer mechanisms to explore its scope in inherited optic neuropathy.


Assuntos
Transplante de Células-Tronco Mesenquimais , Atrofia Óptica Hereditária de Leber/terapia , Humanos
9.
Int Arch Occup Environ Health ; 83(7): 791-801, 2010 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-20617332

RESUMO

PURPOSE: The focal aim of the present study was to identify the genetic alterations occurring in the tannery workers and surrounding inhabitants chronically exposed to hexavalent chromium [Cr(VI)]. METHODS: A total of 108 samples which includes 72 exposed subjects [36 directly exposed (DE) subjects and 36 indirectly exposed (IE) subjects] and 36 controls were recruited for this study. The exposed subjects and controls were selected based on the Cr level present in air and their urine. Directly exposed subjects were categorized based on their work duration in the tannery industries, whereas the indirectly exposed subjects were categorized based on their year of residence in the place adjacent to tannery industries for more than 3 decades. Controls were normal and healthy. Age was matched for the exposed subjects and controls. The exposed subjects as well as the controls were categorized based on their age (group I, <40 years; group II, >41 years). Cell cultures were established from blood samples (5 ml from each subject) collected from the subjects (exposed subjects and controls) after obtaining informed consent. G-banding (Giemsa staining) of the cultures, micronucleus (MN) assay and comet assay were used to identify the genetic alterations of individuals exposed to Cr(VI) in comparison with the controls. RESULTS: A higher degree of total CA [12 ± 8.49 (21-25 years)] and MN [18.69 ± 7.39 (11-15 years)] was found in DE subjects compared to other groups. In IE subjects, elevated levels of CA [5.67 ± 1.15 (51-60 years)] and MN [25 ± 9.89 (71-80 years)] were observed. As expected, controls exhibited minimal number of alterations. The overall CA frequency due to Cr exposure was significantly different from that of the controls for both chromatid and chromosome type aberrations (P < 0.05 by ANOVA). The MN/1,000 binucleated cells were significantly increased (P < 0.05) in the peripheral lymphocytes of DE and IE subjects in comparison with controls. The mean tail length of comet assay for DE, IE and controls were analyzed. The mean tail length of DE subjects [4.21 (3.21-10.98)] was higher compared to that of IE subjects [3.98 (2.98-11.27)] and controls [3.01 (2.68-9.40)]. CONCLUSION: In conclusion, this work shows a clear genotoxic effect associated with chromium exposure, both directly and indirectly. Our result reinforces the higher sensitivity of cytogenetic assays for the biomonitoring of occupationally exposed populations. There is a strong need to educate those who work with potentially hazardous heavy about its adverse effects and highlight the importance of using protective measures.


Assuntos
Cromo/toxicidade , Aberrações Cromossômicas/induzido quimicamente , Exposição Ambiental/efeitos adversos , Micronúcleos com Defeito Cromossômico/induzido quimicamente , Exposição Ocupacional/efeitos adversos , Curtume , Adulto , Poluentes Atmosféricos/análise , Análise de Variância , Cromo/urina , Ensaio Cometa , Humanos , Índia , Linfócitos , Pessoa de Meia-Idade , Fatores de Risco , Adulto Jovem
10.
Bull Environ Contam Toxicol ; 85(2): 121-4, 2010 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-20652227

RESUMO

The focal aim of this study was to assess the frequency of chromosomal aberrations (CA) including chromatid type aberrations (CTA) and chromosomal type aberrations (CSA), micronucleus (MN) and XRCC1 399 Arg/Gln polymorphism in the peripheral blood lymphocytes of 27 petrol pump workers and same number of controls to explore the possible cytogenetic risk on occupational exposure to petrol vapors. The exposed subjects and controls were classified into two groups based on their age (group I < 40 years; group II > 40 years) apart from the classification of the exposed subjects based on their exposure duration (> 8 and < 8 years). CTA and MN frequency were significantly higher in petrol pump workers (p < 0.05) with longer work duration. CTA was found to increase with age in the exposed subjects as well as controls, with exposed subjects showing a statistically higher degree. This effect was not observed in MN. A significantly higher frequency of MN was observed in the smoking petrol pump workers than in control smokers (p < 0.05). No association was found between smoking and CA in both subjects. The study on XRCC1 399 Arg/gln polymorphism in petrol pump workers demonstrated very less difference in allele frequency compared to controls. In conclusion, these datas indicate that petrol pump workers under risk group should be monitored for any long-term adverse effects of the exposure.


Assuntos
Aberrações Cromossômicas/induzido quimicamente , Gasolina/toxicidade , Leucócitos/efeitos dos fármacos , Exposição Ocupacional , Troca de Cromátide Irmã/efeitos dos fármacos , Adulto , Fatores Etários , Células Cultivadas , DNA/efeitos dos fármacos , Dano ao DNA , Proteínas de Ligação a DNA/genética , Feminino , Humanos , Masculino , Testes para Micronúcleos , Saúde Ocupacional , Polimorfismo de Nucleotídeo Único , Medição de Risco , Fumar , Proteína 1 Complementadora Cruzada de Reparo de Raio-X
11.
J Autism Dev Disord ; 50(8): 2740-2764, 2020 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-32016693

RESUMO

Drug studies on Rett syndrome (RTT) have drastically increased over the past few decades. This review aims to provide master data on bench-to-bedside drug studies involving RTT. A comprehensive literature review was performed by searching in PUBMED, MEDLINE and Google Scholar, international, national and regional clinical trial registries and pharmaceutical companies using the keywords "Rett syndrome treatment and/or drug or compound or molecule". Seventy drugs were investigated in non-clinical (N = 65 animal/cell line-based studies; N = 5 iPSC-based study) and clinical trials (N = 34) for ameliorating the symptoms of RTT. Though there is good progress in both clinical and non-clinical studies, none of these drugs entered phase III/IV for being launched as a therapeutic agent for RTT.


Assuntos
Síndrome de Rett/tratamento farmacológico , Animais , Modelos Animais de Doenças , Feminino , Humanos
12.
Toxicol Res (Camb) ; 9(3): 230-238, 2020 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-32670554

RESUMO

Triple negative breast carcinoma (TNBC) is an aggressive form of cancer, with high rates of morbidity, mortality, poor prognosis and limited therapeutic options. The objective of the present study was to elaborate the anticancer activity of Troxerutin (TXN) in TNBC/MDA-MB-231 cells. Herein, we demonstrated the inhibitory effects of TXN on the breast cancer cell growth via induction of apoptosis. Mitochondrial membrane potential (∆Ψm), DNA damage and apoptotic nuclear changes were analyzed by flowcytometry, AO/EtBr and Hoechst staining, respectively. Furthermore, apoptotic protein and gene expressions were analyzed by western blot and reverse transcription polymerase chain reaction (RT-PCR), respectively. Our results indicated that TXN induces apoptosis as evidenced by inhibit the cell proliferation, enhanced apoptotic activation, altered mitochondrial membrane potential and elevated level of DNA damage in TNBC cells. Furthermore, the TXN inhibit anti-apoptotic protein expression with the subsequent upregulation of Cytochrome c, Caspase-9 and Caspase-3. Thus, TXN induces apoptosis in TNBC cells through inducing nuclear damage and altered apoptotic marker expressions. Therefore, TXN might be used as a potential therapeutic agent for the treatment of triple negative breast cancer.

13.
Acta Neurol Belg ; 120(2): 257-265, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-31965540

RESUMO

Visual disorder is one of the non-motor symptoms found in Parkinson's disease (PD). It can be easily identified in the early stages even before the spread of pathological conditions to the brain parts. Studies have revealed that loss of dopamine (DA) cells in retinal layers is a prime cause for both retinal disturbance and pathological conditions of PD. This reduction of DA in retina is due to the aggregation of phosphorylated α-synuclein (aSyn) in the intra-retinal region, which eventually results in visual impairment in PD. Until now, very limited studies have been focused on the mechanism of aSyn influence and DA depletion as a cause for both retinal layer dysfunction and PD. Thus, more research is warranted to provide the missing connection between the exact role of DA and aSyn as a risk factor for visual problems in PD. Hence, the current review's focus is on the function and effects of DA degeneration in retinal cells of PD. Further, we suggest that iron plays a major role in regulating the aggregation of aSyn in the DA cells of retina and brain in PD. The study finds that the unidentified pathophysiological role of retinal degeneration in PD is an essential biomarker that needs further investigation to use it as a novel therapy in treating retinal dysfunctions in PD.


Assuntos
Doença de Parkinson , Retina/patologia , Animais , Dopamina/metabolismo , Humanos , Doença de Parkinson/complicações , Doença de Parkinson/metabolismo , Doença de Parkinson/patologia , Retina/metabolismo , Transtornos da Visão/etiologia
14.
Life Sci ; 260: 118438, 2020 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-32949585

RESUMO

Arsenic is a ubiquitous metalloid compound commonly found in the environment, and it is usually found in combination with sulphur and metals. Arsenic is considered as a therapeutic as well as poisoning agent since ancient times. It causes toxic effects on different organs, mainly the liver. In this review, we focused on the molecular mechanism of arsenic-induced hepatotoxicity. Here we envisaged the bridge between arsenic and hepatotoxicity with particular focus on the level of hepatic enzymes such as ALT, AST, and ALP. Here, we attempted to elucidate the role of arsenic in redox imbalance on increased oxidative stress (elevated level of ROS, MDA and NO) and decreased antioxidant levels such as reduced GSH, catalase, and SOD. Oxidative stress induces mitochondrial dysfunction via apoptosis (AKT-PKB, MAPK, PI3/AKT, PKCδ-JNK, AKT/ERK, p53 pathways), fibrosis (TGF-ß/Smad pathway), and necrosis and inflammation (TNF-α, NF-ĸB, IL-1, and IL-6). Along with that, arsenic activates caspases and Bax, decreases Bcl2 through mitochondrial dysfunction, and induces apoptosis regulatory mechanism. We believe the alteration of all these pathways leads to arsenic-induced hepatotoxicity.


Assuntos
Intoxicação por Arsênico/metabolismo , Arsênio/toxicidade , Doença Hepática Induzida por Substâncias e Drogas/metabolismo , Animais , Antioxidantes/metabolismo , Apoptose/efeitos dos fármacos , Feminino , Humanos , Cirrose Hepática/induzido quimicamente , Cirrose Hepática/metabolismo , Mitocôndrias Hepáticas/efeitos dos fármacos , Mitocôndrias Hepáticas/metabolismo , NF-kappa B/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Gravidez , Efeitos Tardios da Exposição Pré-Natal , Transdução de Sinais/efeitos dos fármacos
15.
Sci Total Environ ; 729: 139021, 2020 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-32360909

RESUMO

The novel Coronavirus disease 2019 (COVID-19) is an illness caused due to Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2). The World Health Organization (WHO) has declared this outbreak a global health emergency and as on April 24, 2020, it has spread to 213 countries, with 25,91,015 confirmed cases and 742,855 cases have been recovered from COVID-19. In this dreadful situation our team has already published an article in the Science of the Total Environment, which elaborates the various aspects of the SARS-CoV-2 infection. In this situation, it is imperative to understand the possible outcome of COVID-19 recovered patients and determine if they have any other detrimental illnesses by longitudinal analysis to safeguard their life in future. It is necessary to follow-up these recovered patients and performs comprehensive assessments for detection and appropriate management towards their psychological, physical, and social realm. This urges us to suggest that it is highly important to provide counselling, moral support as well as a few recommended guidelines to the recovered patients and society to restore to normalcy. Epidemiological, clinical and immunological studies from COVID-19 recovered patients are particularly important to understand the disease and to prepare better for potential outbreaks in the future. Longitudinal studies on a larger cohort would help us to understand the in-depth prognosis as well as the pathogenesis of COVID-19. Also, follow-up studies will help us provide more information for the development of vaccines and drugs for these kinds of pandemics in the future. Hence, we recommend more studies are required to unravel the possible mechanism of COVID-19 infection and the after-effects of it to understand the characteristics of the virus and to develop the necessary precautionary measures to prevent it.


Assuntos
Betacoronavirus , Infecções por Coronavirus , Pandemias , Pneumonia Viral , COVID-19 , Seguimentos , Humanos , SARS-CoV-2
16.
Eur J Pharmacol ; 852: 51-57, 2019 Jun 05.
Artigo em Inglês | MEDLINE | ID: mdl-30831081

RESUMO

Cancer incidence, metastasis, drug resistance and recurrence are still the critical issues of oncological diseases especially Ovarian cancer (OC). It has been suggested that drug resistance and disease relapse are the main causes for the aggressive nature of OC. There is an immediate need to develop novel strategies to understand the mechanism to overcome chemoresistance. Nanog has been found to regulate stemness like cells inside the cancer cells that are termed as Cancer Stem Cells (CSCs). These cells show high self-renewal capacity with a peculiar potential in tumour initiation, heterogeneity, progression, metastasis, recurrence, radiotherapy and multi drug resistance. Recent studies have demonstrated that Nanog, a key transcription factor for pluripotency, has been playing a major role in chemoresistance. In this review, we address the functions of Nanog in both normal and cancer cells, how Nanog is involved in OC tumorigenesis and chemoresistance. This review also highlights the methods that are used for targeting Nanog as a remedy for treating OC. Thus, through this review, we predict that these concepts will open new avenues of research in ovarian cancer stem cells, and would propose Nanog as a target to improve the outcome of chemotherapy.


Assuntos
Terapia de Alvo Molecular/métodos , Proteína Homeobox Nanog/metabolismo , Neoplasias Ovarianas/tratamento farmacológico , Animais , Carcinogênese/efeitos dos fármacos , Resistencia a Medicamentos Antineoplásicos/efeitos dos fármacos , Feminino , Humanos , Neoplasias Ovarianas/metabolismo , Neoplasias Ovarianas/patologia
17.
Bioinformation ; 15(12): 887-895, 2019.
Artigo em Inglês | MEDLINE | ID: mdl-32256009

RESUMO

Herpes simplex viruses (HSV) are alpha herpes viruses, which causes life-threatening illness. Therefore, it is of interest to design and develop potential drugs to treat HSV infections. We show the optimal molecular docking properties of a secondary metabolite (3, 7, 11, 15 tetra methyl-2-2-hexadecen-'1-ol) with the glycoprotein receptors of HSV1 and HSV 2 for further consideration.

18.
Acta Neurol Belg ; 119(3): 393-401, 2019 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-30554347

RESUMO

Autism spectrum disorder is a neurodevelopmental disorder and the cause of autism is still unclear. The aim of this study was to investigate the association of socioeconomic, environmental, pregnancy and newborn-related risk factors among children with autism spectrum disorders. This was a population-based case-control study. The study included 55 children with autism spectrum disorder and 55 age and sex matched typically developing normal children (TD) between 3 and 12 years. Several socio-economic factors, environmental factors, pregnancy related, natal, post-natal factors and the first noticed signs by the parents were analyzed. Chi-square test was used to compare nominal variables. For multivariate analysis, forward stepwise logistic regression model was employed to examine the association between autism and the chances that the child develops ASD to assess the odds ratios. Male predominance was observed in the study. Logistic regression model showed statistical significance of the following factors: paternal age greater than 40 years, family history of autism, nutrition during pregnancy, mode of labor, fetal hypoxia, NICU stay and history of breast feeding. In this epidemiological study of autism in Coimbatore city, we found correlation between several environmental factors during fetal development and can be transmitted to succeeding generations, causing atypical behavior phenotypes. The exact exposure magnitude, exposure time in relation to vital developmental periods need to be studied to understand the influence of socioeconomic and environmental factors, which can be improved to prevent ASD-related challenges.


Assuntos
Transtorno do Espectro Autista/epidemiologia , Transtorno do Espectro Autista/etiologia , Aleitamento Materno/estatística & dados numéricos , Predisposição Genética para Doença/epidemiologia , Doenças do Recém-Nascido/epidemiologia , Complicações do Trabalho de Parto/epidemiologia , Pais , Efeitos Tardios da Exposição Pré-Natal/epidemiologia , Fatores Socioeconômicos , Estudos de Casos e Controles , Criança , Pré-Escolar , Feminino , Humanos , Índia/epidemiologia , Recém-Nascido , Masculino , Gravidez , Fatores de Risco , Fatores Sexuais
19.
Mutat Res Rev Mutat Res ; 776: 10-22, 2018.
Artigo em Inglês | MEDLINE | ID: mdl-29807574

RESUMO

Ampulla of vater carcinoma (AVC) is a rare gastrointestinal tumour that is associated with a high mortality rate and it's often diagnosed at later stages due to lack of clinical symptoms. Early diagnosis of this condition is essential to effectively treat patients for better prognosis. A significant amount of advancement has been made in understanding the molecular nature of cancer in the past decade. A substantial number of mutations and alterations have been detected in various tumors. Despite the occurrence of AVC across the globe, the number of studies conducted on this tumor type remains low; this is largely due to its rare occurrence. Moreover, AVC tissues are complex and contain mutations in oncogenes, tumour suppressors, apoptotic proteins, cell proliferation proteins, cell signaling proteins, transcription factors, chromosomal abnormalities and cellular adhesion proteins. The frequently mutated genes included KRAS, TP53 and SMAD4 and are associated with prognosis. Several molecules of the PI3K, Wnt signaling, TGF-beta pathway and cell cycle have also been altered in AVCs. This review comprises of all the genetic mutations, associated pathways and related prognosis that are involved in AVCs from the year 1989 to 2017. This report can be used as a stepping-stone to establish biomarkers for early diagnosis of AVC and to discover molecular targets for drug therapy.


Assuntos
Ampola Hepatopancreática , Neoplasias do Ducto Colédoco/genética , Mutação , Moléculas de Adesão Celular/genética , Aberrações Cromossômicas , Neoplasias do Ducto Colédoco/diagnóstico , Reparo do DNA/genética , Genes Supressores de Tumor , Marcadores Genéticos , Humanos , Oncogenes , Prognóstico , Transdução de Sinais/genética
20.
Stem Cell Investig ; 4: 20, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28447035

RESUMO

Recent advances in induced pluripotent stem cell (iPSC) technology target screening and discovering of therapeutic agents for the possible cure of human diseases. Human induced pluripotent stem cells (hiPSC) are the right kind of platform for testing potency of specific active compounds. Ayurveda, the Indian traditional system of medicine developed between 2,500 and 500 BC, is a science involving the intelligent formulations of herbs and minerals. It can serve as a "goldmine" for novel neuroprotective agents used for centuries to treat neurological disorders. This review discusses limitations in screening drugs for neurological disorders and the advantages offered by hiPSC integrated with Indian traditional system of medicine. We begin by describing the current state of hiPSC technology in research on Rett syndrome (RTT) followed by the current controversies in RTT research combined with the emergence of patient-specific hiPSC that indicate an urgent need for researchers to understand the etiology and drug mechanism. We conclude by offering recommendations to reinforce the screening of active compounds present in the ayurvedic medicines using the human induced pluripotent neural model system for research involving drug discovery for RTT. This integrative approach will fill the current knowledge gap in the traditional medicines and drug discovery.

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