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1.
Environ Monit Assess ; 195(8): 990, 2023 Jul 25.
Artigo em Inglês | MEDLINE | ID: mdl-37491409

RESUMO

Human interventions and rapid changes in land use adversely affect the adequate distribution of water resources. A research study was conducted to quantify the gap between demand and supply for irrigation water in Multan, Pakistan, which may lead to sustainable water management. Two remotely sensed images (Landsat 8 OLI and Landsat 5 TM) were downloaded for the years 2010 and 2020, and supervised classification method was performed for the selected land use land cover (LULC) classes and basic framework. During the evaluation, the kappa coefficient was found in the ranges of 0.83-0.85, and overall accuracy was found to be more than 80% which indicated a substantial agreement between the classified maps and the ground truth data for both years and seasons. The LULC maps showed that urbanization has increased by 49% during the last decade (2010-2020). Reduction in planting areas for wheat (9%), cotton (24%), and orchards (46%) was observed. An increase in planting areas for rice (92%) and sugarcane (63%) was observed. The changing LULC pattern may be related to variation in water demand and supply for irrigation. The irrigation water demand has decreased by 370.2 Mm3 from 2010 to 2020, due to the reduction in agricultural land and an increase in urbanization. Available irrigation water supply (canals/rainfall) was estimated as 2432 Mm3 for the year 2020 which was 26% less than that of total irrigation water demand (3281 Mm3). The findings also provide the database for sustainable water management and equitable distribution of water in the region.


Assuntos
Sistemas de Informação Geográfica , Tecnologia de Sensoriamento Remoto , Humanos , Paquistão , Monitoramento Ambiental/métodos , Urbanização , Grão Comestível , Conservação dos Recursos Naturais
2.
J Relig Health ; 2023 May 11.
Artigo em Inglês | MEDLINE | ID: mdl-37166691

RESUMO

Life-threatening events including terminal illness intensify the search for meaning and incite individuals to get closer to religion. Terminal patients can often find religious practices as helpful as medical therapy for bettering both physical and mental health. The present research aims to explain the interaction between religion, spirituality, and social support in coping with terminal illness among Muslim hepatitis C patients in Pakistan. A semi-structured open-ended interview guide was utilized to collect the data. Participants expressed that the deployment of religious and spiritual beliefs along with socio-emotional support during illness fostered medical therapy. Participants also revealed that belief in God provided them the strength to be steadfast during the terminal stage of the disease. Religious beliefs enabled terminal participants to accept death as an eventual reality and a normal part of their lives. Furthermore, participants put forward their longing for those kinds of religious practices that terminal diseases usually restrained them from receiving. The emotional support stemming from social relationships also improved resilience to cope with the terminal stage of illness. The study concludes that the interplay of religion, spirituality, and social support normalizes the fear of death, lessens pain, and improves resilience among Muslim hepatitis C patients in Pakistan.

3.
J Relig Health ; 62(4): 2916-2932, 2023 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-36877419

RESUMO

Religion and spirituality have been key coping mechanisms of Pakistani Muslims amidst natural calamities such as the COVID-19 pandemic. This study aimed to identify and explore the role of religion and spirituality in the recovery of COVID-19 patients in lower socioeconomics. The data for this qualitative research study were collected from 13 people in Pakistan who survived COVID-19 infection during the wave of the Omicron variant. The participants of this study referenced four key themes about their story of getting infected by COVID-19 and recovering from it and referenced religion and spirituality as an overarching aspect of that story. The patients who recovered believed that COVID-19 was a punishment from God for sinful humanity, which was unavoidable. Amidst such a belief, the studied patients tried to avoid hospitalization but prayed to God for mercy, forgiveness, and help in their recovery. A few who took medical treatment also established and/or strengthened their spiritual connections seeking quick recovery from the infection. The participants of this study believed that their religion or spirituality played a medicinal role in their recovery from COVID-19 infection.


Assuntos
COVID-19 , Espiritualidade , Humanos , Paquistão , Pandemias , SARS-CoV-2 , Religião , Islamismo , Pesquisa Qualitativa , Adaptação Psicológica , Classe Social
4.
Psychol Health Med ; 28(9): 2713-2719, 2023.
Artigo em Inglês | MEDLINE | ID: mdl-35440249

RESUMO

Despite its widespread prevalence, bullying in educational institutions is not considered a serious social issue in Pakistan. Present study explores the understandings and experiences of college students about bullying and documents the status of anti-bullying interventions in educational institutions. This study is based on in-depth interviews with students and principals of private sector colleges in Pakistan. The study showcases the important aspects of bullying that hurt the educational, personal and social lives of students. The most frequent form of bullying experienced by the students constitutes verbal bullying. Bullying occurs at specific places on campuses which are less supervised by teachers and administration. Although the principals were of the view that they had zero tolerance towards bullying in their premises, they did not have any preventive measures. There is a dire need to develop a policy to address the issue of bullying in educational institutions.

5.
Can Rev Sociol ; 59(S1): 134-150, 2022 10.
Artigo em Inglês | MEDLINE | ID: mdl-36039400

RESUMO

Based on a correspondence experiment, this article examines if the size of population of foreign background in a city exerts any significant effect on the extent of labour-market discrimination faced by job applicants of migrant origin. The study results find neither any statistically significant relationship between the two, nor do they lend support to the group threat and group contact conceptual frameworks. Rather, they appear to corroborate the pure discrimination model, as discrimination seems to be uniformly spread over all cities and all types of jobs with different characteristics. However, the findings of this study do not exclude the possibility that there could be a threshold value in the share of foreign population after which the picture of discrimination would become richer in nuances and some of the theories would gain more explanatory power.


Basé sur une expérience de correspondance, cet article examine si la taille de la population d'origine étrangère dans une ville exerce un effet significatif sur l'ampleur de la discrimination sur le marché du travail à laquelle sont confrontés les candidats à l'emploi d'origine immigrée. Les résultats de l'étude ne révèlent aucune relation statistiquement significative entre les deux, et ne soutiennent pas non plus les cadres conceptuels de la menace de groupe et du contact de groupe. Ils semblent plutôt corroborer le modèle de discrimination pure, car la discrimination semble être uniformément répandue dans toutes les villes et dans tous les types d'emplois présentant des caractéristiques différentes. Toutefois, les résultats de cette étude n'excluent pas la possibilité qu'il puisse y avoir une valeur seuil dans la part de la population étrangère après laquelle le tableau de la discrimination deviendrait plus riche en nuances et certaines des théories gagneraient en pouvoir explicatif.


Assuntos
Migrantes , Cidades , Humanos , Ocupações
6.
Aging (Albany NY) ; 14(16): 6716-6726, 2022 08 24.
Artigo em Inglês | MEDLINE | ID: mdl-36036756

RESUMO

Estrogen and its receptor play a positive role in the development of osteoarthritis (OA). Psoralen is a plant-derived estrogen analog. This study aimed to verify whether psoralen inhibits OA through an estrogen-like effect. First, human primary chondrocytes in the late stage of OA were extracted to complete collagen type II immunofluorescence staining and cell proliferation experiments. Subsequently, estrogen, psoralen and estrogen receptor antagonists were co-cultured with OA chondrocytes, and RT-PCR was performed to detect the gene expression. A rabbit OA model was subsequently made by anterior cruciate ligament transection (ACLT). They were set as Sham group, OA group and Psoralen group, respectively. The articular cartilage samples were taken after 5 weeks of treatment, and the effect was observed by gross observation, histological staining, micro-CT scanning of subchondral bone. The results of cellular experiments displayed that the cultured cells were positive for collagen II fluorescence staining and 12 µg/mL psoralen was selected as the optimal concentration. In addition, psoralen had effects similar to estrogen, promoting the expression of estrogen tar-get genes CTSD, PGR and TFF1 and decreasing the expression of the inflammation-related gene TNF- α, IL-1ß and IL-6. The effect of psoralen was blocked after the use of an estrogen receptor antagonist. Further animal experiments indicated that the psoralen group showed less destruction of cartilage tissue and decreased OASRI scores compared with the OA group. A subchondral bone CT scan demonstrated that psoralen significantly increased subchondral bone mineral density (BMD), trabecular thickness and trabecular number and decreased trabecular separation. In summary, psoralen inhibits the inflammatory production of chondrocytes, which is related to estrogen-like effect, and can be used to attenuate the progression of OA.


Assuntos
Cartilagem Articular , Osteoartrite , Animais , Cartilagem Articular/metabolismo , Condrócitos/metabolismo , Modelos Animais de Doenças , Estrogênios/metabolismo , Ficusina/farmacologia , Ficusina/uso terapêutico , Humanos , Inflamação/metabolismo , Osteoartrite/metabolismo , Coelhos
7.
J Community Psychol ; 50(2): 983-991, 2022 03.
Artigo em Inglês | MEDLINE | ID: mdl-34416030

RESUMO

Pain is a complex, multidimensional phenomenon and integral component of illness but little is known about its religious construction and interpretation. This article discusses an important yet neglected component of terminal illness which is the religious construction of pain. Eleven hepatitis C Muslim patients admitted to the liver center were recruited for this study. In-depth interviews helped the identification of dominant themes. The study found that terminal patients construct pain in a religious context and interpret it into religious realms. For them, pain helps to realize their debility and helplessness. They think pain has a transformatory potential and can help them turn to be very strong and brave. The participants also reported having a belief that pain in this world could be compensated in the life hereafter and they will be rewarded with good deeds and bestowed with the Jannah (paradise). The terminal patients strongly influenced by religion and spirituality believed to be experiencing pain as a punishment of their misdeeds. Thus, pain was helping them to normalize their end-of-life experiences and ease the terminal stage of their illness.


Assuntos
Hepatite C , Islamismo , Humanos , Dor , Espiritualidade , Doente Terminal
8.
Front Med (Lausanne) ; 8: 751456, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34869444

RESUMO

Background: Malaria among pregnant women is one of the major causes of maternal and infant mortality and morbidity, especially in high-risk areas. Therefore, our study identified the burden of malaria for pregnant women, non-pregnant women, and children under 5 years of age, and malaria service health facilities in Bannu district, Khyber Pakhtunkhwa, Pakistan. Methods: A cross-sectional study was conducted. In this survey, 15,650 individuals were surveyed, and 1,283 were malaria-positive detected. The data were collected from 80 different healthcare centers. SPSS version 23 was used for data analysis. ArcGIS version 10.8 was used for study area mapping. Results: Malaria was detected in 23.3% of children under five, 4.4% of pregnant women, and 72.3% of non-pregnant women, respectively. Moreover, P. falciparum, P. vivax, and mixed infection had a prevalence of 2.1, 96.8, and 1.1%. The most often used and effective medications to treat malaria were chloroquine (29.7%) and primaquine (69.4%). Conclusion: This study's findings depict that malaria's prevalence in the non-pregnant women's group was high. Additionally, P. vivax infection was found to be more prevalent than other types of malaria infection. Due to the scarcity of healthcare facilities in this endemic region, special attention should be directed to strengthening the malaria surveillance and eradication programs.

9.
Front Pharmacol ; 12: 730557, 2021.
Artigo em Inglês | MEDLINE | ID: mdl-34421623

RESUMO

Background and purpose: Eucommia ulmoides polysaccharides (EUP) can regulate the immunity of macrophages, but the functional status of macrophages is related to osteoarthritis and synovial inflammation. The purpose of this study is to explore whether EUP has the effect of inhibiting osteoarthritis and its possible mechanism. Methods: MTT test was used to evaluate the appropriate concentration of EUP and real-time quantitative polymerase chain reaction (RT-qPCR) was conducted to detect the effect of EUP on gene expression in RAW 264.7 cells. The osteoarthritis model was constructed by the anterior cruciate ligament transection (ACLT) in the rabbits. These rabbits were divided into three groups, sham operation group, OA group, and EUP group. The changes in articular cartilage were detected by gross observation and histological staining, and Micro-CT tested subchondral bone. Finally, the changes of macrophages in synovial tissue were studied by immunohistochemistry. Results: The results showed that EUP at the concentration of 50ug/mL and 100ug/mL were beneficial to the proliferation of macrophages. The qPCR results indicated that EUP inhibited the expression of inflammation-related genes IL-6, IL-18 and IL-1ß, and promoted the expression of osteogenic and cartilage-related genes BMP-6, Arg-1 and transforming growth factor beta (TGF-ß). The results of in vivo experiments suggested that the degree of destruction of articular cartilage in the EUP group was significantly reduced, and the Osteoarthritis Research Society International (OARSI) score was significantly reduced. Compared with the OA group, the subchondral cancellous bone density of the EUP group increased, the number and thickness of trabecular bone increased, and the separation of trabecular bone decreased. Synovial macrophage immunohistochemistry results manifested that EUP, on the one hand, reduced M1 polarized macrophages, on the other hand, accumulated M2 polarized macrophages. Conclusion: EUP can promote articular cartilage repair and subchondral bone reconstruction. The regulation of the polarization state of macrophages may be one of its mechanisms to delay the progression of osteoarthritis.

10.
Clin Neurol Neurosurg ; 196: 105818, 2020 09.
Artigo em Inglês | MEDLINE | ID: mdl-32622108

RESUMO

OBJECTIVE: The cystic gliomas are the special type of malignant tumors in the brain and often lead to unsatisfied prognosis, but the microsurgical resection is still the most important treatment. However, they are difficult to be totally removed with craniotomy, especially for those who have flimsy cyst walls. Recently, we attempted to resect them via an innovative surgical technique, "Gelfoam Padding", in order to improve the total resection rate of the tumors safely. PATIENTS AND METHODS: Fifteen patients suffering intracerebral cystic gliomas underwent surgical intervention via "Gelfoam Padding" technique between 2015 and 2018, and the different histopathological results and their features of cyst walls were recorded. Then, the total resection rate of tumors as well as the complications after surgeries were analyzed to assess the applied value of this technique. RESULTS: All the patients were improved in the clinical symptoms after the operations. According to the intraoperative assessment and MRI examinations performed within 72 h after surgery, total resection of the tumor was achieved in all patients. Besides, there were no serious postoperative complications in these cases with this technique. CONCLUSION: The cystic glioma with the flimsy wall was the best applied indication of "Gelfoam Padding" technique, which could not only improve the total resection rate of tumors, but also be safe for the patients.


Assuntos
Neoplasias Encefálicas/cirurgia , Encéfalo/cirurgia , Esponja de Gelatina Absorvível , Glioma/cirurgia , Adolescente , Adulto , Idoso , Encéfalo/diagnóstico por imagem , Neoplasias Encefálicas/diagnóstico por imagem , Craniotomia/métodos , Feminino , Glioma/diagnóstico por imagem , Humanos , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Adulto Jovem
11.
J Colloid Interface Sci ; 554: 627-639, 2019 Oct 15.
Artigo em Inglês | MEDLINE | ID: mdl-31344529

RESUMO

The intertwined exploring of solar water driven into chemical energy configurated by a constituted semiconductor photocatalyst under sunlight approach toward a remediation eager method that solve the environmental issues. Currently we optimized polymeric carbon nitride PCN by a sophisticated molecular co-polymerization process which diffused with a mirror organic conjugated heterocyclic monomer to maximize its photocatalytic activity. Herein, for the 1st time we report an organic π-electron stacking conjugated thiazolothiazole (TT) as a small molecule within the framework of PCN to enhance the conductive optical and photocatalytic properties of PCN under solar energy irradiation. The fusion of this bicyclic thiazolothiazole (TT) co-monomer within PCN remarkably enhanced the charge carrier motilities and giving a rigid packing due to sulfur contents. Excitingly the as-synthesized samples were processed under different liberated characterization such as XRD, FTIR, BET, SEM, TEM, XPS, PL, DRS and EPR under both regions respectively. Results reflect that the integration of thiazolothiazole (TT) in the heptazine structure of PCN alter a prodigious delocalization in its π-conjugated system and similarly demonstrating an apparent fluctuation in its surface area, electronic structure, its calculated band gap, chemical composition analysis and maximize the process of generation of electrons under solar light from ground state (HOMO) to the excited state (LUMO) of polymeric carbon nitride (PCN). Beside, this unique integrity of TT co-monomer with in PCN matrix remarkably improve the photocatalytic activity toward prosperity and the amount optimized CNU-TT12.0 demonstrated an outstanding photocatalytic activity of water reduction for H2 evolution and as well of RhB pollutant photodegradation. The sample optimized display 10.6 enhancement comparatively pure pristine sample.

12.
World Neurosurg ; 117: e117-e129, 2018 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-29883817

RESUMO

BACKGROUND: Our previous studies have shown that mesencephalic astrocyte-derived neurotrophic factor (MANF) provides a neuroprotective effect against ischemia/reperfusion injury and is also involved in inflammatory disease models. This study investigates the potential role and mechanism of MANF in acute brain damage after traumatic brain injury (TBI). METHODS: The model of TBI was induced by Feeney free falling methods with male Sprague-Dawley rats. The expression of MANF, 24 hours after TBI, was detected by the immunohistochemistry, immunofluorescence, Western blot, and reverse transcription polymerase chain reaction techniques. After treatment with recombinant human MANF after TBI, assessment was conducted 24 hours later for brain water content, cerebral edema volume in magnetic resonance imaging, neurobehavioral testing, and Evans blue extravasation. Moreover, by the techniques of Western blot and reverse transcription polymerase chain reaction, the expression of inflammatory cytokines (interleukin 1ß and tumor necrosis factor α) and P65 was also analyzed to explore the underlying protective mechanism of MANF. RESULTS: At 24 hours after TBI, we found that endogenous MANF was widely expressed in the rat's brain tissues and different types of cells. Treatment with a high dose of recombinant human MANF (20 µg/20 µL) significantly increased the modified Garcia score, and reduced brain water content as well as cerebral edema volume on magnetic resonance imaging. Furthermore, MANF alleviated not only the permeability of the blood-brain barrier (BBB) but also the expressions of interleukin 1ß and tumor necrosis factor α messenger RNA and protein. Besides, the activation of P65 was also inhibited. CONCLUSIONS: These results suggest that MANF provides a neuroprotective effect against acute brain injury after TBI, via attenuating blood-brain barrier disruption and intracranial neuroinflammation; the inhibition of the NF-κB signaling pathway might be a potential mechanism.


Assuntos
Barreira Hematoencefálica/efeitos dos fármacos , Lesões Encefálicas Traumáticas/prevenção & controle , Fatores de Crescimento Neural/farmacologia , Fármacos Neuroprotetores/farmacologia , Animais , Masculino , Doenças do Sistema Nervoso/etiologia , Distribuição Aleatória , Ratos Sprague-Dawley , Proteínas Recombinantes/farmacologia
13.
Genes Genomics ; 40(3): 243-251, 2018 03.
Artigo em Inglês | MEDLINE | ID: mdl-29892795

RESUMO

Breast cancer is the most common malignant disease amongst women. miRNAs are small, non-coding RNAs that regulate gene expression, thus have the potential to play an important role during cancer development. Emerging evidence shows that miR-135a is down-regulated in breast cancer cells, but the functional roles of miR-135a in breast cancer cells remains unexplored. For this purpose, we investigated the expression of miR-135a in breast cancer cells and explored its functional role during breast cancer progression. In vitro study showed that miR-135a may be a novel tumor suppressor. Further studies showed that transcription factors ELK1 and ELK3 are direct target genes of miR-135a that modulates the suppressive function of miR-135a in breast cancer cells. Induced expression of miR-135a significantly downregulated the expression of ELK1 and ELK3 both at mRNA and protein levels. Furthermore, the effect of miR-135a in MCF-7 and T47D cells was investigated by the overexpression of miR-135a mimics. In vitro, induced expression of miR-135a in breast cancer cells inhibited cell Proliferation and clongenicity. Moreover, a luciferase activity assay revealed that miR-135a could directly target the 3'-untranslated region (3' UTRS) of ELK1 and ELK3 oncogenes. In addition, rescue experiment demonstrated that the promoted cell growth by transcription factors ELK1 and ELK3 was attenuated by the over-expression of miR-135a. Our study demonstrates that miR-135a regulates cell proliferation in breast cancer by targeting ELK1 and ELK3 oncogenes, and suggests that miR-135a potentially can act as a tumor suppressor.


Assuntos
Neoplasias da Mama/genética , MicroRNAs/genética , MicroRNAs/fisiologia , Proteínas Proto-Oncogênicas/genética , Fatores de Transcrição/genética , Proteínas Elk-1 do Domínio ets/genética , Linhagem Celular Tumoral , Proliferação de Células/genética , Feminino , Regulação Neoplásica da Expressão Gênica , Humanos , Células MCF-7 , Oncogenes , Proteínas Proto-Oncogênicas/metabolismo , Proteínas Proto-Oncogênicas c-ets , Fatores de Transcrição/metabolismo , Proteínas Elk-1 do Domínio ets/metabolismo
14.
J Biol Chem ; 292(33): 13551-13564, 2017 08 18.
Artigo em Inglês | MEDLINE | ID: mdl-28637868

RESUMO

Tamoxifen-resistant (TAMR) estrogen receptor-positive (ER+) breast cancer is characterized by elevated Erb-B2 receptor tyrosine kinase 2 (ERBB2) expression. However, the underlying mechanisms responsible for the increased ERBB2 expression in the TAMR cells remain poorly understood. Herein, we reported that the ERBB2 expression is regulated at the post-transcriptional level by miR26a/b and the RNA-binding protein human antigen R (HuR), both of which associate with the 3'-UTR of the ERBB2 transcripts. We demonstrated that miR26a/b inhibits the translation of ERBB2 mRNA, whereas HuR enhances the stability of the ERBB2 mRNA. In TAMR ER+ breast cancer cells with elevated ERBB2 expression, we observed a decrease in the level of miR26a/b and an increase in the level of HuR. The forced expression of miR26a/b or the depletion of HuR decreased ERBB2 expression in the TAMR cells, resulting in the reversal of tamoxifen resistance. In contrast, the inactivation of miR26a/b or forced expression of HuR decreased tamoxifen responsiveness of the parental ER+ breast cancer cells. We further showed that the increase in HuR expression in the TAMR ER+ breast cancer cells is attributable to an increase in the HuR mRNA isoform with shortened 3'-UTR, which exhibits increased translational activity. This shortening of the HuR mRNA 3'-UTR via alternative polyadenylation (APA) was observed to be dependent on cleavage stimulation factor subunit 2 (CSTF2/CstF-64), which is up-regulated in the TAMR breast cancer cells. Taken together, we have characterized a model in which the interplay between miR26a/b and HuR post-transcriptionally up-regulates ERBB2 expression in TAMR ER+ breast cancer cells.


Assuntos
Regiões 3' não Traduzidas/efeitos dos fármacos , Neoplasias da Mama/tratamento farmacológico , Resistencia a Medicamentos Antineoplásicos , Proteína Semelhante a ELAV 1/metabolismo , MicroRNAs/metabolismo , Receptor ErbB-2/metabolismo , Tamoxifeno/farmacologia , Antineoplásicos Hormonais/farmacologia , Neoplasias da Mama/metabolismo , Neoplasias da Mama/patologia , Linhagem Celular Tumoral , Proliferação de Células/efeitos dos fármacos , Fator Estimulador de Clivagem , Feminino , Humanos , MicroRNAs/antagonistas & inibidores , Mutação , Proteínas de Neoplasias/agonistas , Proteínas de Neoplasias/antagonistas & inibidores , Proteínas de Neoplasias/genética , Proteínas de Neoplasias/metabolismo , Poliadenilação/efeitos dos fármacos , Interferência de RNA , Estabilidade de RNA/efeitos dos fármacos , RNA Mensageiro/agonistas , RNA Mensageiro/antagonistas & inibidores , RNA Mensageiro/química , RNA Mensageiro/metabolismo , RNA Neoplásico/agonistas , RNA Neoplásico/antagonistas & inibidores , RNA Neoplásico/química , RNA Neoplásico/metabolismo , Proteínas de Ligação a RNA/agonistas , Proteínas de Ligação a RNA/genética , Proteínas de Ligação a RNA/metabolismo , Receptor ErbB-2/agonistas , Receptor ErbB-2/antagonistas & inibidores , Receptor ErbB-2/genética , Elementos de Resposta/efeitos dos fármacos , Regulação para Cima/efeitos dos fármacos
15.
Toxicol Ind Health ; 30(5): 415-20, 2014 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-22914266

RESUMO

N, N, N', N'-tetramethylethylenediamine (TEMED) is extensively used for initiating polymerization of acrylamide and bisacrylamide gel for electrophoresis and for inorganic complex structure formation. The present study evaluates the toxicological effect of TEMED on structures of rat brain acetylcholinesterase (AChE) activity. In vitro study showed that the Ki values for striatum, cortex, cerebellum and hypothalamus were found to be 1.24, 1.4, 1.45 and 1.47 mM. Kinetics studies indicated that TEMED caused mixed type of inhibition that is a combination of competitive and noncompetitive inhibition in striatum, cortex, hypothalamus and cerebellum. The result showed that km increased and V max decreased with increase in TEMED concentration. The IC50 values calculated for striatum, cortex, cerebellum and hypothalamus were found to be as 0.92, 0.92, 1.44 and 1.42 mM. The present study indicates that TEMED is a toxicant for brain via inhibition of AChE. Therefore, proper precaution should be made during its handling.


Assuntos
Acetilcolinesterase/efeitos dos fármacos , Encéfalo/efeitos dos fármacos , Etilenodiaminas/toxicidade , Acetilcolinesterase/metabolismo , Animais , Encéfalo/enzimologia , Cerebelo/efeitos dos fármacos , Cerebelo/enzimologia , Córtex Cerebral/efeitos dos fármacos , Córtex Cerebral/enzimologia , Corpo Estriado/efeitos dos fármacos , Corpo Estriado/enzimologia , Relação Dose-Resposta a Droga , Feminino , Hipotálamo/efeitos dos fármacos , Hipotálamo/enzimologia , Concentração Inibidora 50 , Ratos , Ratos Wistar
16.
Bull Environ Contam Toxicol ; 89(2): 229-33, 2012 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-22653306

RESUMO

The toxicological effects of the active ingredients of the herbicides diuron and bentazon on the activity of acetylcholinesterase (AChE) of krait (Bungarus sindanus) venom and electric eel (Electrophorus electricus) were studied. The diuron and entazon caused non-competitive inhibition of AChE from both species. For the venom AChE, the calculated IC50 for diuron and bentazon were found to be 3.25 and 0.14 µM, while for eel AChE, the respective IC50 values were 3.6 and 0.135 µM. In comparison, bentazon was a more potent inhibitor than diuron of AChE from both species. The insecticide lindane did not have any inhibitory effect on AChE activity in either species, even when tested at high concentrations (200-800 µM).


Assuntos
Acetilcolinesterase/metabolismo , Benzotiadiazinas/toxicidade , Diurona/toxicidade , Herbicidas/toxicidade , Venenos de Serpentes/metabolismo , Animais , Bungarus/metabolismo , Inibidores da Colinesterase/toxicidade , Electrophorus/metabolismo , Monitoramento Ambiental/métodos , Hexaclorocicloexano/toxicidade , Concentração Inibidora 50 , Inseticidas/toxicidade
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