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1.
Curr Genomics ; 23(4): 289-298, 2022 Aug 11.
Artigo em Inglês | MEDLINE | ID: mdl-36777877

RESUMO

Background: Plastids are plant-specific semi-autonomous self-replicating organelles, containing circular DNA molecules called plastomes. Plastids perform crucial functions, including photosynthesis, stress perception and response, synthesis of metabolites, and storage. The plastome and plastid numbers have been shown to be modulated by developmental stage and environmental stimuli and have been used as a biomarker (identification of plant species) and biosensor (an indicator of abiotic and biotic stresses). However, the determination of plastome sequence and plastid number is a laborious process requiring sophisticated equipment. Methods: This study proposes using plastome copy number (PCN), which can be determined rapidly by real-time quantitative polymerase chain reaction (RT-qPCR) as a plant product quality biomarker. This study shows that the PCN log10 and range PCN log10 values calculated from RT-qPCR data, which was obtained for two years from leaves and lint samples of cotton and seed samples of cotton, rice, soybean, maize, and sesame can be used for assessing the quality of the samples. Results: Observation of lower range PCN log10 values for CS (0.31) and CR (0.58) indicated that the PCN showed little variance from the mean PCN log10 values for CS (3.81) and CR (3.85), suggesting that these samples might have encountered ambient environmental conditions during growth and/ or post-harvest storage and processing. This conclusion was further supported by observation of higher range PCN log10 values for RS (3.09) versus RP (0.05), where rice seeds in the RP group had protective hull covering compared to broken hull-less seeds in the RS group. To further support that PCN is affected by external factors, rice seeds treated with high temperatures and pathogens exhibited lower PCN values when compared to untreated seeds. Furthermore, the range PCN log10 values were found to be high for cotton leaf (CL) and lint (Clt) sample groups, 4.11 and 3.63, respectively, where leaf and lint samples were of different sizes, indicating that leaf samples might be of different developmental stage and lint samples might have been processed differently, supporting that the PCN is affected by both internal and external factors, respectively. Moreover, PCN log10 values were found to be plant specific, with oil containing seeds such as SeS (6.49) and MS (5.05) exhibiting high PCN log10 values compared to non-oil seeds such as SS (1.96). Conclusion: In conclusion, it was observed that PCN log10 values calculated from RT-qPCR assays were specific to plant species and the range of PCN log10 values can be directly correlated to the internal and external factors and, therefore might be used as a potential biomarker for assessing the quality of plant products.

2.
J Obstet Gynaecol ; 42(5): 1037-1042, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35019789

RESUMO

Preterm birth is a leading cause of perinatal morbidity and mortality and Preterm premature rupture of the membranes (PPROM) is a major risk factor contributing to approximately one third of preterm deliveries. Vaginal infections are often associated with PPROM and are characterised by loss of lactobacillin normal vaginal flora and overgrowth of other pathogenic microorganisms. Probiotics appear to have an emerging role in prolonging pregnancy after PPROM. This trial compared the efficacy of a vaginal probiotic in combination with standard antibiotic prophylaxis versus only antibiotic in prolongation of latency period and on perinatal outcome in cases of PPROM between 24 and 34 weeks. Although no significant difference was observed in the mean latency period (p = 0.937) and mean gestational age at birth (p = 0.863) between the two groups, the overall neonatal outcome was better in the study group. There is need of further large-scale clinical trials to demonstrate effectiveness of probiotics.IMPACT STATEMENTWhat is already known on this subject? PPROM is an important cause of preterm birth. Prematurity leads significant global burden of neonatal morbidity and mortality. Antibiotics in PPROM have a proven benefit to prolong latency period from start of PPROM to birth. Probiotics have a role in improving vaginal flora and reducing infections and have been tried in PPROM.What do the results of this study add? The usefulness of probiotics in prolonging latency period and improving neonatal outcome has been reported in limited trials. In our study it has shown an improvement in neonatal outcome overall but not statistically significant compared to few studies which have reported significant beneficial effects. This might be due to existence of variation in the type of the vaginal microflora in different study population.What are the implications of these findings for clinical practice and/or further research? Preliminary results suggest that use of probiotic may benefit women with PPROM. This also implies need of multicentric larger scales trials with different types of probiotics so as to clarify whether any intervention in vaginal microflora can lead to any benefits in reducing the prematurity and its consequence, both on the neonate and heath care infrastructure.


Assuntos
Ruptura Prematura de Membranas Fetais , Doenças do Recém-Nascido , Nascimento Prematuro , Probióticos , Antibacterianos/uso terapêutico , Antibioticoprofilaxia , Feminino , Ruptura Prematura de Membranas Fetais/tratamento farmacológico , Idade Gestacional , Humanos , Recém-Nascido , Doenças do Recém-Nascido/tratamento farmacológico , Gravidez , Resultado da Gravidez , Nascimento Prematuro/prevenção & controle , Probióticos/uso terapêutico
3.
J Assoc Physicians India ; 70(12): 11-12, 2022 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-37355966

RESUMO

INTRODUCTION: The hemodynamic adjustments during pregnancy play a pivotal role in sustaining the gestation, however, its clinical connotation on midterm renal hyperfiltration and its consequence on maternal and fetal outcomes need a greater appraisal. The present retrospective study looked into the midterm estimated glomerular filtration rate (eGFR) among pregnant females without overt pieces of evidence of chronic kidney disease (CKD) as a surrogate marker for midterm hyperfiltration and its implication on maternal and fetal outcomes. MATERIALS AND METHODS: All pregnancies among females aged 18-50 years with available pregestational baseline serum creatinine were included in the study. Maternal renal hyperfiltration was expressed as the highest eGFR, using the creatinine clearance method. Its association with adverse maternal and fetal outcomes was assessed. RESULTS: A total of 1,045 pregnancies were assessed during the study. According to midterm eGFR, among them, 65% of pregnancies showed midterm eGFR between 120 and 150, however, 4.3% of pregnancies had values more than 150 mL/min per 1.73 m2 . The risk of poor pregnancy outcome was observed for eGFR levels below and above the reference level of 120-150 mL/min per 1.73 m2 (1.97 for values ≥150 mL/min per 1.73 m2 , and 1.72 for 90-120 mL/min per 1.73 m2 ). Pregnancies with eGFR between 60 and 90 mL/min per 1.73 m2 had odds ratios (ORs) of 5.64. CONCLUSION: A distinctive relationship was observed between the midterm eGFR and adverse pregnancy outcomes with the best outcomes for midterm eGFR levels between 120 and 150 mL/min per 1.73 m2 . Despite no apparent functional renal deterioration, a poor maternal hyperfiltration response may play a crucial impact on poor pregnancy outcomes.


Assuntos
Rim , Insuficiência Renal Crônica , Feminino , Gravidez , Humanos , Taxa de Filtração Glomerular/fisiologia , Estudos Retrospectivos , Resultado da Gravidez , Insuficiência Renal Crônica/complicações , Creatinina
4.
Indian J Crit Care Med ; 26(1): 114-122, 2022 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-35110854

RESUMO

BACKGROUND: Epidemiology of liver disease in obstetric patients shows geographical variation depending upon the prevalence of preeclampsia, viral hepatitis, and tropical vector-borne diseases like malaria, leptospirosis, etc. We undertook the current systematic review to analyze the causes of hepatic dysfunction in obstetric patients in India and identify the gaps in the literature and reporting. MATERIALS AND METHODS: We did a systematic review of studies reporting the causes of hepatic dysfunction in obstetric patients in India. A methodological quality assessment was done using a five-point questionnaire. RESULTS: A total of 21 studies qualified for evaluation. The rate of hepatic dysfunction among obstetric patients in India ranged from 0.15 to 3.3% with a mean and median rate of 1.49 and 0.93%, respectively. Preeclampsia/HELLP (mean = 36.0%, median = 31.4%, range: 3.6-83.8%) and viral hepatitis (mean = 34.1%, median = 35.5%, range: 5.1-61.8%) were the commonest causes of hepatic dysfunction. Other causes were intrahepatic cholestasis of pregnancy, acute fatty liver of pregnancy, tropical fever (malaria, leptospirosis, dengue, scrub typhus), etc. Maternal mortality ranged from 1.4 to 40% (mean = 12.6%, median = 10.0%) and perinatal mortality was between 16.4 and 38.70% (mean = 31.75%, median = 35.5%). CONCLUSION: There is moderate quality evidence to show that preeclampsia/HELLP and viral hepatitis are the commonest causes of hepatic dysfunction in obstetric patients in India. HOW TO CITE THIS ARTICLE: Ahmed A, Saxena S, Pandey A, Mishra P, Azim A. Analysis of Causes of Hepatic Dysfunction in Obstetric Patients in India: A Systematic Review. Indian J Crit Care Med 2022;26(1):114-122.

5.
Indian J Crit Care Med ; 26(10): 1141-1151, 2022 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-36876193

RESUMO

Background: Pregnancy-related acute kidney injury (PRAKI) is an important cause of fetomaternal mortality and morbidity in developing countries. We undertook a systematic review to identify the causes of PRAKI among obstetric patients in India. Materials and methods: We systematically searched PubMed, MEDLINE, Embase, and Google Scholar using appropriate search terminology between 1 January 2010 to 31 December 2021. Studies reporting the etiology of PRAKI among obstetric patients (pregnant and within 42 days postpartum) in India were included for evaluation. Studies done in any other geographical location besides India were excluded. We also excluded studies done in any one trimester or any specific subgroup of patients [e.g., postpartum acute kidney injury (AKI), postabortal AKI]. A five-point questionnaire was used to assess the risk of bias in included studies. The results were synthesized as per preferred reporting items for systematic reviews and meta-analyses (PRISMA) guidelines. Results: A total number of 7 studies with 477 participants were included for analysis. All were single-center descriptive observational studies either done in tertiary care public or private hospitals. Sepsis (mean, 41.9%; median, 49.4%; and range, 6-56.1%) was the most common cause of PRAKI followed by hemorrhage (mean, 22.1%; median, 23.5%; and range, 8.3-38.5%) and pregnancy-induced hypertension (mean, 20.9%; median, 20.7; and range, 11.5-39%). Among these seven studies, five were of moderate quality, one was of high quality, and another one was of low quality. Our study is limited due to the lack of consensus definition of PRAKI in literature and heterogeneity in reporting methods. Our study highlights the need for a structured reporting format for PRAKI to understand the true disease burden and take control measures. Conclusion: There is a moderate quality of evidence to suggest that sepsis followed by hemorrhage and pregnancy-induced hypertension are the commonest causes of PRAKI in India. How to cite this article: Gautam M, Saxena S, Saran S, Ahmed A, Pandey A, Mishra P, et al. Etiology of Pregnancy-related Acute Kidney Injury among Obstetric Patients in India: A Systematic Review. Indian J Crit Care Med 2022;26(10):1141-1151.

6.
J Exp Bot ; 69(16): 4003-4015, 2018 07 18.
Artigo em Inglês | MEDLINE | ID: mdl-29767755

RESUMO

Potassium (K+) is a major macronutrient required for plant growth. An adaptive mechanism to low-K+ conditions involves activation of the Ca2+ signaling network that consists of calcineurin B-like proteins (CBLs) and CBL-interacting kinases (CIPKs). The CBL-interacting protein kinase 9 (CIPK9) has previously been implicated in low-K+ responses in Arabidopsis thaliana. Here, we report a protein phosphatase 2C (PP2C), AP2C1, that interacts with CIPK9. Fluorescence resonance energy transfer (FRET), bimolecular fluorescence complementation (BiFC), and co-localization analyses revealed that CIPK9 and AP2C1 interact in the cytoplasm. AP2C1 dephosphorylates the auto-phosphorylated form of CIPK9 in vitro, presenting a regulatory mechanism for CIPK9 function. Furthermore, genetic and molecular analyses revealed that ap2c1 null mutants (ap2c1-1 and ap2c1-2) are tolerant to low-K+ conditions, retain higher K+ content, and show higher expression of K+-deficiency related genes contrary to cipk9 mutants (cipk9-1 and cipk9-2). In contrast, transgenic plants overexpressing AP2C1 were sensitive to low-K+ conditions. Thus, this study shows that AP2C1 and CIPK9 interact to regulate K+-deficiency responses in Arabidopsis. CIPK9 functions as positive regulator whereas AP2C1 acts as a negative regulator of Arabidopsis root growth and seedling development under low-K+ conditions.


Assuntos
Proteínas de Arabidopsis/metabolismo , Arabidopsis/metabolismo , Fosfoproteínas Fosfatases/metabolismo , Potássio/metabolismo , Proteínas Serina-Treonina Quinases/metabolismo , Arabidopsis/genética , Homeostase , Mutação , Fosforilação , Ligação Proteica , Transdução de Sinais
7.
Eur Arch Otorhinolaryngol ; 275(11): 2719-2726, 2018 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-30171340

RESUMO

BACKGROUND: A molecular surrogate may exist for the clinical behaviour of juvenile nasopharyngeal angiofibroma (JNA). METHODS: In 9-14 cases, a 'correlation' of clinical behaviour with molecular expression (m-RNA expression through RT-PCR) of VEGF, FGF, PDGF, Ras, c-Myc, c-Kit and p53 was undertaken. RESULTS: A comparison of the two extremes of expressions characterized some specific clinical phenotypes for every marker except c-Myc. A higher FGF was associated with post-adolescent presentation, smaller tumour size, enhanced haemorrhage and recurrence. A higher c-Kit was associated with adolescents, rapid growth, skull base involvement and recurrence. Enhanced Ras was associated with post-adolescence, smaller tumour size, skull base involvement and recurrence. Enhanced p53 and PDGF were associated with adolescents, early presentation and rapid progression. Higher VEGF expression was associated with skull base involvement and enhanced haemorrhage. CONCLUSION: This study is currently the only evidence revealing a clinical molecular association in JNA and larger multicentric studies need to be performed to show a statistical significance.


Assuntos
Angiofibroma/metabolismo , Neoplasias Nasofaríngeas/metabolismo , Adolescente , Fatores Etários , Angiofibroma/patologia , Progressão da Doença , Fatores de Crescimento de Fibroblastos/genética , Fatores de Crescimento de Fibroblastos/metabolismo , Marcadores Genéticos , Hemorragia/patologia , Humanos , Neoplasias Nasofaríngeas/patologia , Invasividade Neoplásica , Recidiva Local de Neoplasia , Fator de Crescimento Derivado de Plaquetas/genética , Fator de Crescimento Derivado de Plaquetas/metabolismo , Estudos Prospectivos , Proteínas Proto-Oncogênicas c-kit/genética , Proteínas Proto-Oncogênicas c-kit/metabolismo , Proteínas Proto-Oncogênicas c-myc/genética , Proteínas Proto-Oncogênicas c-myc/metabolismo , RNA Mensageiro/metabolismo , Base do Crânio/patologia , Fator de Crescimento Transformador beta1/genética , Fator de Crescimento Transformador beta1/metabolismo , Carga Tumoral , Proteína Supressora de Tumor p53/genética , Proteína Supressora de Tumor p53/metabolismo , Fator A de Crescimento do Endotélio Vascular/genética , Fator A de Crescimento do Endotélio Vascular/metabolismo , Proteínas ras/genética , Proteínas ras/metabolismo
8.
Curr Genomics ; 18(6): 523-541, 2017 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-29204081

RESUMO

Protein phosphorylation-dephosphorylation is a well-known regulatory mechanism in biological systems and has become one of the significant means of protein function regulation, modulating most of the biological processes. Protein kinases play vital role in numerous cellular processes. Kinases transduce external signal into responses such as growth, immunity and stress tolerance through phosphorylation of their target proteins. In order to understand these cellular processes at the molecular level, one needs to be aware of the different substrates targeted by protein kinases. Advancement in tools and techniques has bestowed practice of multiple approaches that enable target identification of kinases. However, so far none of the methodologies has been proved to be as good as a panacea for the substrate identification. In this review, the recent advances that have been made in the identifications of putative substrates and the implications of these kinases and their substrates in stress management are discussed.

9.
Plant Physiol ; 169(1): 780-92, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26198257

RESUMO

The role of calcium-mediated signaling has been extensively studied in plant responses to abiotic stress signals. Calcineurin B-like proteins (CBLs) and CBL-interacting protein kinases (CIPKs) constitute a complex signaling network acting in diverse plant stress responses. Osmotic stress imposed by soil salinity and drought is a major abiotic stress that impedes plant growth and development and involves calcium-signaling processes. In this study, we report the functional analysis of CIPK21, an Arabidopsis (Arabidopsis thaliana) CBL-interacting protein kinase, ubiquitously expressed in plant tissues and up-regulated under multiple abiotic stress conditions. The growth of a loss-of-function mutant of CIPK21, cipk21, was hypersensitive to high salt and osmotic stress conditions. The calcium sensors CBL2 and CBL3 were found to physically interact with CIPK21 and target this kinase to the tonoplast. Moreover, preferential localization of CIPK21 to the tonoplast was detected under salt stress condition when coexpressed with CBL2 or CBL3. These findings suggest that CIPK21 mediates responses to salt stress condition in Arabidopsis, at least in part, by regulating ion and water homeostasis across the vacuolar membranes.


Assuntos
Proteínas de Arabidopsis/metabolismo , Arabidopsis/fisiologia , Osmose/efeitos dos fármacos , Cloreto de Sódio/farmacologia , Estresse Fisiológico/efeitos dos fármacos , Arabidopsis/efeitos dos fármacos , Arabidopsis/genética , Proteínas de Ligação ao Cálcio/metabolismo , DNA Bacteriano/genética , Regulação da Expressão Gênica de Plantas/efeitos dos fármacos , Teste de Complementação Genética , Manitol/farmacologia , Modelos Biológicos , Mutagênese Insercional/efeitos dos fármacos , Mutação/genética , Fenótipo , Proteínas Serina-Treonina Quinases/metabolismo , Regulação para Cima/efeitos dos fármacos , Vacúolos/efeitos dos fármacos , Vacúolos/metabolismo
10.
Crit Rev Biotechnol ; 36(6): 1023-1035, 2016 12.
Artigo em Inglês | MEDLINE | ID: mdl-26380928

RESUMO

Protein phosphatases (PPs) counteract kinases in reversible phosphorylation events during numerous signal transduction pathways in eukaryotes. Type 2C PPs (PP2Cs) represent the major group of PPs in plants, and recent discovery of novel abscisic acid (ABA) receptors (ABARs) has placed the PP2Cs at the center stage of the major signaling pathway regulating plant responses to stresses and plant development. Several studies have provided deep insight into vital roles of the PP2Cs in various plant processes. Global analyses of the PP2C gene family in model plants have contributed to our understanding of their genomic diversity and conservation, across plant species. In this review, we discuss the genomic and structural accounts of PP2Cs in plants. Recent advancements in their interaction paradigm with ABARs and sucrose nonfermenting related kinases 2 (SnRK2s) in ABA signaling are also highlighted. In addition, expression analyses and important roles of PP2Cs in the regulation of biotic and abiotic stress responses, potassium (K+) deficiency signaling, plant immunity and development are elaborated. Knowledge of functional roles of specific PP2Cs could be exploited for the genetic manipulation of crop plants. Genetic engineering using PP2C genes could provide great impetus in the agricultural biotechnology sector in terms of imparting desired traits, including a higher degree of stress tolerance and productivity without a yield penalty.


Assuntos
Proteínas de Plantas , Proteína Fosfatase 2C , Ácido Abscísico/metabolismo , Genômica , Proteínas de Plantas/química , Proteínas de Plantas/genética , Proteínas de Plantas/metabolismo , Plantas/enzimologia , Plantas/genética , Conformação Proteica , Proteína Fosfatase 2C/química , Proteína Fosfatase 2C/genética , Proteína Fosfatase 2C/metabolismo , Estresse Fisiológico/genética
11.
Indian J Med Res ; 143(Supplement): S112-S119, 2016 May.
Artigo em Inglês | MEDLINE | ID: mdl-27748285

RESUMO

BACKGROUND & OBJECTIVES: Despite their high occurrence and associated significant level of morbidity manifesting as spectrum of clinical symptoms, the pathogenesis of uterine leiomyomas (ULs) remains unclear. We investigated expression profile of tumour suppressor genes PTEN (phosphatase and tensin homolog deleted on chromosome ten) and LKB1 (liver kinase B1), and key signaling components of P13K (phosphatidylinositol 3-kinase)/Akt (protein kinase B)/mTOR (mammalian target of rapamycin) pathway in leiomyomas and adjacent normal myometrium in women of reproductive age, to explore the possibility of targeting this pathway for future therapeutic implications. METHODS: Real time PCR (qPCR) was used to quantify relative gene expression levels of PTEN, Akt1, Akt2, mTOR, LKB1 and VEGFA (vascular endothelial growth factor A) in leiomyoma as compared to adjacent normal myometrium. Immunohistochemistry was subsequently performed to analyze expression of PTEN, phospho-Akt, phospho-mTOR, phospho-S6, LKB1 and VEGFA in leiomyoma and adjacent normal myometrium. RESULTS: Significant upregulation of PTEN (2.52 fold; P=0.03) and LKB1 (3.93 fold; P0.01), and downregulation of VEGFA (2.95 fold; P=0.01) genes were observed in leiomyoma as compared to normal myometrium. Transcript levels of Akt1, Akt2 and mTOR did not vary significantly between leiomyoma and myometrium. An increased immunoexpression of PTEN (P=0.015) and LKB1 (P<0.001) and decreased expression of VEGFA (P=0.01) was observed in leiomyoma as compared to myometrium. Immunostaining for activated (phosphorylated) Akt, mTOR and S6 was absent or low in majority of leiomyoma and myometrium. INTERPRETATION & CONCLUSIONS: Upregulation of PTEN and LKB1 in concert with negative or low levels of activated Akt, mTOR and S6 indicates that PI3K/Akt/mTOR pathway may not play a significant role in pathogenesis of leiomyoma.


Assuntos
Leiomioma/genética , PTEN Fosfo-Hidrolase/biossíntese , Proteínas Serina-Treonina Quinases/biossíntese , Proteínas Supressoras de Tumor/biossíntese , Neoplasias Uterinas/genética , Quinases Proteína-Quinases Ativadas por AMP , Adulto , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Leiomioma/patologia , Pessoa de Meia-Idade , Proteínas de Neoplasias/biossíntese , PTEN Fosfo-Hidrolase/genética , Fosfatidilinositol 3-Quinases/genética , Fosforilação , Proteínas Serina-Treonina Quinases/genética , Proteínas Proto-Oncogênicas c-akt/genética , Transdução de Sinais , Serina-Treonina Quinases TOR/genética , Proteínas Supressoras de Tumor/genética , Neoplasias Uterinas/patologia , Fator A de Crescimento do Endotélio Vascular/genética
12.
Am J Otolaryngol ; 37(4): 317-22, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27157983

RESUMO

BACKGROUND: Juvenile nasopharyngeal angiofibroma (JNA) has witnessed a four-fold increase in the incidence at our facility in the current decade as compared to the 1980s. With high global incidence of human pappilloma virus (HPV) related oropharyngeal cancer in India, we hypothesize its implication in JNA as it has not yet been reported. METHODS: Clinico-Surgical variables of 6 patients of JNA were included for correlation and their tissue samples were subjected to western blotting (WB), polymerase chain reaction and immunoflorescence to demonstrate a definite association with HPV. In addition 6 control samples (adenoids) underwent WB analysis. OBSERVATIONS: A universal presence of HPV with JNA is novel 'discovery' and has suggested a possibility of a definite association. Only a single case suggested weak infection. None of the controls suggested infection, thus ruling out the presence of HPV in nasopharynx of normal population. INTERPRETATION: With the dawn of this definite association, no specific conclusions can yet be drawn but a whole plethora of questions have emerged with our novel 'discovery'.


Assuntos
Angiofibroma/virologia , DNA Viral/isolamento & purificação , Neoplasias Nasofaríngeas/virologia , Papillomaviridae/isolamento & purificação , Adolescente , Angiofibroma/metabolismo , Angiofibroma/patologia , Anticorpos Antivirais/metabolismo , Estudos de Coortes , Humanos , Masculino , Neoplasias Nasofaríngeas/metabolismo , Neoplasias Nasofaríngeas/patologia
13.
Physiol Plant ; 155(2): 89-108, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25953089

RESUMO

In a given environment, plants are constantly exposed to multitudes of stimuli. These stimuli are sensed and transduced to generate a diverse array of responses by several signal transduction pathways. Calcium (Ca2+ ) signaling is one such important pathway involved in transducing a large number of stimuli or signals in both animals and plants. Ca2+ engages a plethora of decoders to mediate signaling in plants. Among these groups of decoders, the sensor responder complex of calcineurin B-like protein (CBL) and CBL-interacting protein kinases (CIPKs) play a very significant role in transducing these signals. The signal transduction mechanism in most cases is phosphorylation events, but some structural role for the pair has also come to light recently. In this review, we discuss the structural nature of the sensor-responder duo; their mechanism of substrate phosphorylation and also their structural role in modulating targets. Moreover, the mechanism of complex formation and mechanistic role of protein phosphatases with CBL-CIPK module has been mentioned. A comparison of CBL-CIPK with other decoders of Ca2+ signaling in plants also signifies the relatedness and diversity in signaling pathways. Further an attempt has been made to compare this aspect of Ca2+ signaling pathways in different plant species to develop a holistic understanding of conservation of stimulus-response-coupling mediated by this Ca2+ -CBL-CIPK module.

14.
Curr Genomics ; 16(4): 224-36, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-26962298

RESUMO

Reversible protein phosphorylation is a crucial regulatory mechanism that controls many biological processes in eukaryotes. In plants, phosphorylation events primarily occur on serine (Ser) and threonine (Thr) residues, while in certain cases, it was also discovered on tyrosine (Tyr) residues. In contrary to plants, extensive reports on Tyr phosphorylation regulating a large numbers of biological processes exist in animals. Despite of such prodigious function in animals, Tyr phosphorylation is a least studied mechanism of protein regulation in plants. Recently, various chemical analytical procedures have strengthened the view that Tyr phosphorylation is equally prevalent in plants as in animals. However, regardless of Tyr phosphorylation events occuring in plants, no evidence could be found for the existence of gene encoding for Tyr phosphorylation i.e. the typical Tyr kinases. Various methodologies have suggested that plant responses to stress signals and developmental processes involved modifications in protein Tyr phosphorylation. Correspondingly, various reports have established the role of PTPs (Protein Tyrosine Phosphatases) in the dephosphorylation and inactivation of mitogen activated protein kinases (MAPKs) hence, in the regulation of MAPK signaling cascade. Besides this, many dual specificity protein phosphatases (DSPs) are also known to bind starch and regulate starch metabolism through reversible phosphorylation. Here, we are emphasizing the significant progress on protein Tyr phosphatases to understand the role of these enzymes in the regulation of post-translational modification in plant physiology and development.

15.
Microb Pathog ; 74: 38-41, 2014 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-25107739

RESUMO

More than a quarter of women who experience acute cystitis develop recurrence but information on specific urovirulent genetic profile of uropathogenic Escherichia coli associated with recurrent cystitis is still limited. In this prospective cohort study, index episode E. coli from a cohort of 46 sexually active women with acute cystitis who reported recurrence during followup were grouped into repeat infection (RI) and single infection (SI) isolates, based on enterobacterial repetitive intergenic consensus (ERIC) PCR profile comparison with subsequent E. coli isolated from same women. PCR for phylogrouping and 15 virulence genes along with test for biofilm formation were done. Virulence score was calculated for each isolate as number of virulence genes detected. Among 46 index E. coli, 22 were RI, and 24 were SI isolates. RI isolates had phylogroup B2 as majority (54.5%) which is typically described as more virulent phylogroup and virulence score for RI isolates was also significantly higher compared to SI isolates. Virulence gene malX (p = 0.03) was significantly associated with RI isolates. 68.2% RI isolates were strong to moderate biofilm producers in comparison to 33.3% SI isolates, an important survival strategy to reside in bladder and or vagina. Overall, E. coli associated with recurrent cystitis appear to be more virulent and malX seems to have a role in causing repeat infection.


Assuntos
Cistite/microbiologia , Infecções por Escherichia coli/microbiologia , Escherichia coli Uropatogênica/genética , Fatores de Virulência/genética , Análise por Conglomerados , Estudos de Coortes , Feminino , Genótipo , Humanos , Tipagem Molecular , Filogenia , Reação em Cadeia da Polimerase , Estudos Prospectivos , Recidiva , Escherichia coli Uropatogênica/classificação , Escherichia coli Uropatogênica/isolamento & purificação , Fatores de Virulência/análise
16.
FEBS J ; 2024 Aug 07.
Artigo em Inglês | MEDLINE | ID: mdl-39110129

RESUMO

CCAAT/enhancer-binding protein α (C/EBPα), a key myeloid transcription factor, drives myeloid differentiation from blast cells by regulating the expression of granulocyte colony stimulating factor receptor and C/EBPε as required for promoting granulocyte differentiation. Here, we show that serine/threonine-protein kinase NLK, also known as Nemo-like kinase, physically associates with C/EBPα and phosphorylates it at multiple sites, including Ser21, Thr226, Thr230 and S234, leading to its ubiquitin-mediated degradation. Individual phospho-point mutants of C/EBPα could be phosphorylated by NLK, but a mutant with all phosphorylatable residues replaced by alanine resisted phosphorylation and degradation by NLK, as did the single point mutants. Furthermore, although ectopic expression of NLK enhanced phosphorylation of C/EBPα levels, it markedly inhibited total C/EBPα protein levels. Conversely, NLK depletion inhibited endogenous C/EBPα phosphorylation but enhanced its total protein levels in several acute myeloid leukemia (AML) cell lines and in peripheral blood mononuclear cells isolated from number of AML patient samples. Importantly, NLK depletion in peripheral blood mononuclear cells from primary AML patients not only restored C/EBPα protein levels, but also induced myeloid differentiation, suggesting that NLK could be therapeutically targeted to restore C/EBPα to resolve differentiation arrest in AML.

17.
Indian J Med Res ; 137(4): 753-8, 2013 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-23703344

RESUMO

BACKGROUND & OBJECTIVES: Asymptomatic bacteriuria during pregnancy if left untreated, may lead to acute pyelonephritis, preterm labour, low birth weight foetus, etc. Adequate and early treatment reduces the incidence of these obstetric complications. The present study was done to determine presence of asymptomatic bacteriuria (ASB) and obstetric outcome following treatment in early versus late pregnancy. METHODS: A prospective cohort study was conducted at a tertiary care teaching hospital of north India. Pregnant women till 20 wk (n=371) and between 32 to 34 wk gestation (n=274) having no urinary complaints were included. Their mid stream urine sample was sent for culture and sensitivity. Women having > 10 [5] colony forming units/ml of single organism were diagnosed positive for ASB and treated. They were followed till delivery for obstetric outcome. Relative risk with 95% confidence interval was used to describe association between ASB and outcome of interest. RESULTS: ASB was found in 17 per cent pregnant women till 20 wk and in 16 per cent between 32 to 34 wk gestation. Increased incidence of preeclamptic toxaemia (PET) [RR 3.79, 95% CI 1.80-7.97], preterm premature rupture of membrane (PPROM)[RR 3.63, 45% CI 1.63-8.07], preterm labour (PTL) [RR 3.27, 95% CI 1.38-7.72], intrauterine growth restriction (IUGR)[RR 3.79, 95% CI 1.80-79], low birth weight (LBW) [RR1.37, 95% CI 0.71-2.61] was seen in late detected women (32-34 wk) as compared to ASB negative women, whereas no significant difference was seen in early detected women (till 20 wk) as compared to ASB negative women. INTERPRETATION & CONCLUSIONS: Early detection and treatment of ASB during pregnancy prevents complications like PET, IUGR, PTL, PPROM and LBW. Therefore, screening and treatment of ASB may be incorporated as routine antenatal care for safe motherhood and healthy newborn.


Assuntos
Bacteriúria/tratamento farmacológico , Complicações Infecciosas na Gravidez/diagnóstico , Infecções Urinárias/tratamento farmacológico , Adulto , Bacteriúria/complicações , Estudos de Coortes , Feminino , Humanos , Índia , Recém-Nascido de Baixo Peso , Trabalho de Parto Prematuro , Gravidez , Complicações Infecciosas na Gravidez/induzido quimicamente , Complicações Infecciosas na Gravidez/patologia , Estudos Prospectivos , Resultado do Tratamento , Infecções Urinárias/complicações , Infecções Urinárias/patologia
18.
J Obstet Gynaecol India ; 73(3): 208-213, 2023 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-37324368

RESUMO

Introduction: Gestational diabetes is defined as the carbohydrate intolerance of variable severity with onset or first recognition during pregnancy. Gestational glucose intolerance (GGI) is used to indicate pregnant women whose 2-h postprandial glucose is > 120 mg/dl and below 140 mg/dl (Diabetes in Pregnancy Study Group of India, DIPSI criteria). Aim: This study was planned to see whether intervention in GGI group helps to improve feto-maternal outcomes. Methodology: This open-label randomized control trial was conducted in Department of Obstetrics and Gynaecology of King George's Medical University, Lucknow. Inclusion criteria were all the antenatal women attending the antenatal clinic and diagnosed as GGI, and exclusion criteria were overt diabetes. Results: Total of 1866 antenatal women were screened, and among them, 220 (11.8%) women were diagnosed as gestational diabetes; 412 (22.1%) women were diagnosed as GGI. The mean fasting blood sugars in the women with GGI who had medical nutrition therapy were much lower than the women with GGI who did not have any intervention. The present study showed the women with GGI had higher complications like polyhydramnios, PPROM, foetal growth restriction, macrosomia, preeclampsia, preterm labour and vaginal candidiasis more in the women with GGI as compared to euglycaemic women. Conclusion: The present study of nutritional intervention in GGI group has shown trend towards lesser complication if we start medical nutrition therapy reflected by delayed development of GDM and less neonatal hypoglycaemia and hyperbilirubinemia.

19.
J Family Med Prim Care ; 12(2): 360-365, 2023 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-37091023

RESUMO

Objective: The English version of the Summary of Diabetes Self-Care Activities (SDSCA) measure is the most often used self-reporting instrument assessing diabetes self-management. This study was aimed at translating English SDSCA into the Hindi version and validating and evaluating its psychometric properties. Methods: The Hindi version of SDSCA was developed based on the guidelines provided by the World Health Organization (2008) for translation and adaptation of tool. Following steps were adopted: (1) Cultural and linguistic validation, (2) content validity testing, (3) construct validity testing, and (4) internal validity testing. Sixty women diagnosed with GDM were selected for the purpose of this study. Results: The tool showed promising and satisfactory results. Of mention are the results related to Cronbach's alpha (0.82). The exploratory factor analysis showed three factors that fit the data satisfactorily. Conclusions: This study provided evidence for the reliability and validity of the Hindi Summary of Diabetes Self-Care Activities instrument, which may be used in the future to assess diabetes self-management activities among the pregnant women diagnosed with gestational diabetes mellitus among Hindi-speaking population.

20.
Cureus ; 15(5): e39458, 2023 May.
Artigo em Inglês | MEDLINE | ID: mdl-37362452

RESUMO

INTRODUCTION: Uropathogenic Escherichia coli (UPEC) strains equipped with putative virulence factors (VFs) are known to cause approximately 90% of lower urinary tract infections (UTIs) or cystitis affecting individuals of all age groups. Only limited laboratory-based data on the correlation of antimicrobial resistant patterns and VFs of UPEC are available. MATERIALS AND METHODS: A total of 100 non-duplicate E. coli isolates associated with community-acquired UTIs in sexually active women were analysed for antimicrobial susceptibility patterns and putative virulence-associated genes. Antimicrobial susceptibility testing (AST) was carried out by the Kirby-Bauer disk diffusion method, and results were interpreted as per Clinical and Laboratory Standards Institute (CLSI) guidelines. The isolates non-susceptible to ≥1 agent in ≥3 different antimicrobial categories were considered multidrug-resistant (MDR). Multiplex polymerase chain reaction assay was performed on each E. coli isolate to characterize putative virulence genes (VGs) such as papA, malX, PAI, ibeA, fimH, fyuA, sfa/focDE, papGIII, iutA, papGI, kpsMTII, hlyA, papGII, traT, afa/draBC, cnf1, vat, and yfcV. Results: Capsule synthesis gene kpsMTII (59%)was the most predominant VG present, followed by serum resistance-associated transfer protein gene traT (58%) and adhesin gene fimH (57%); however, adhesin gene papGI (2%) was the least present. The prevalence of antimicrobial resistance was relatively high for commonly used oral antimicrobials of UTI treatment, such as trimethoprim-sulfamethoxazole (68%) and fluoroquinolones (63%). The majority of isolates were MDR (78%) and resistant to extended-spectrum cephalosporins (63.5%). Isolates resistant to norfloxacin and trimethoprim-sulfamethoxazole were also resistant to almost all available oral antimicrobials. Isolates resistant to extended-spectrum cephalosporins showed increased resistance to aztreonam and trimethoprim-sulfamethoxazole (84.6% each) and fluoroquinolones (ciprofloxacin and norfloxacin; 81.5% each). Fosfomycin and nitrofurantoin were the most sensitive antimicrobials for all these resistant isolates. In a multivariate analysis, it was found that MDR isolates were associated with many of the VGs; fimH (65.4%) being the most frequent followed by traT (64.1%). traT (66.2%) and iutA (60.3%) were most commonly present in E. coli isolates resistant to trimethoprim-sulfamethoxazole, while66.7% norfloxacin-resistant isolates have them. Isolates resistant to extended-spectrum cephalosporins were most commonly associated with fimH and traT (66.2% each). However, E. coli isolates positive for sfa/focDE and vat were more sensitive to norfloxacin and trimethoprim-sulfamethoxazole and were non-MDR strains predominantly (p < 0.05). Only two VGs (fimH and traT) were significantly associated with MDR strains. DISCUSSION: The results of the present study clearly show the association of VFs with some of the commonly used oral antibiotics emphasizing the need for further molecular studies and surveillance programs to monitor drug-resistant UPEC so as to form optimized diagnostic stewardship and appropriate regimen for patient treatment. The reason behind this phenomenon of association has not been studied in much detail here but it can be assumed that genes responsible for drug resistance may share neighbouring loci with VGs on the mobile genetic elements (e.g., plasmid), which transfer together from one bacterium to another.

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