Confocal fluorescence microscopy combined with differential interference contrast imaging of tissues from chagasic patients enabled the unequivocal identification of the parasite Trypanosoma cruzi. ...Using different monoclonal antibodies that indicate the parasite form and replication stage in conjunction with DNA labelling, specimens derived from distinct clinical forms of the disease were examined. Intracellular amastigote forms of the parasite were clearly detected in heart, brain, skin, lung, and kidney. Dividing amastigotes as well as trypomastigote forms were recognized in samples obtained from patients undergoing either acute-phase or some form of reactivation caused by immunosuppression.
Alpha5beta1 integrin from both wild-type CHO cells (CHO-K1) and deficient in proteoglycan biosynthesis (CHO-745) is post-translationally modified by glycosaminoglycan chains. We demonstrated this ...using 35Ssulfate metabolic labeling of the cells, enzymatic degradation, immunoprecipitation reaction with monoclonal antibody, fluorescence microscopy, and flow cytometry. The alpha5beta1 integrin heterodimer is a hybrid proteoglycan containing both chondroitin and heparan sulfate chains. Xyloside inhibition of sulfate incorporation into alpha5beta1 integrin also supports that integrin is a proteoglycan. Also, cells grown with xyloside adhered on fibronectin with no alteration in alpha5beta1 integrin expression. However, haptotactic motility on fibronectin declined in cells grown with xyloside or chlorate as compared with controls. Thus, alpha5beta1 integrin is a proteoglycan and the glycosaminoglycan chains of the integrin influence cell motility on fibronectin. Similar glycosylation of alpha5beta1 integrin was observed in other normal and malignant cells, suggesting that this modification is conserved and important in the function of this integrin. Therefore, these glycosaminoglycan chains of alpha5beta1 integrin are involved in cellular migration on fibronectin.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
A presença de tremor e distonia de torção no mesmo paciente é frequente mas não há uma explicação satisfatória para isso. Suspeita-se que haja uma associação da distonia idiopática (DI) com o tremor ...essencial (TE). O objetivo deste estudo é analisar a frequência de tremor postural das mãos em pacientes com DI e distonia sintomática (DS). Foram estudados os prontuários de 185 pacientes com o diagnóstico sindrômico de distonia atendidos no Setor de Investigação em Moléstias Extrapiramidais da Escola Paulista de Medicina. DI foi diagnosticada quando não havia anormalidade no exame neurológico além da distonia e havia exames laboratoriais e de neuroimagem, relacionados à distonia, normais e história pregressa negativa para fatores causais de distonia. Foram analisadas as características clínicas da distonia e a presença de tremor postural nas mãos. Havia 185 pacientes, 120 com DI e 65 com DS. Tremor postural das mãos ocorreu em 27 (22,5%) das DI e 14 (21,5%) das DS. Tremor esteve presente nos quadros focais, segmentares e generalizados e também nos diversos tipos clínicos de DI e DS em proporções semelhantes. História familiar de TE estava ausente em todos os casos com tremor. A presença de tremor postural das mãos em pacientes com DI e DS pode sugerir que a desorganização fisiopatológica que produz a distonia pode favorecer o aparecimento do tremor.
α
5
β
1
integrin from both wild-type CHO cells (CHO-K1) and deficient in proteoglycan biosynthesis (CHO-745) is post-translationally modified by glycosaminoglycan chains. We demonstrated this using
...35
Ssulfate metabolic labeling of the cells, enzymatic degradation, immunoprecipitation reaction with monoclonal antibody, fluorescence microscopy, and flow cytometry. The α
5
β
1
integrin heterodimer is a hybrid proteoglycan containing both chondroitin and heparan sulfate chains. Xyloside inhibition of sulfate incorporation into α
5
β
1
integrin also supports that integrin is a proteoglycan. Also, cells grown with xyloside adhered on fibronectin with no alteration in α
5
β
1
integrin expression. However, haptotactic motility on fibronectin declined in cells grown with xyloside or chlorate as compared with controls. Thus, α
5
β
1
integrin is a proteoglycan and the glycosaminoglycan chains of the integrin influence cell motility on fibronectin. Similar glycosylation of α
5
β
1
integrin was observed in other normal and malignant cells, suggesting that this modification is conserved and important in the function of this integrin. Therefore, these glycosaminoglycan chains of α
5
β
1
integrin are involved in cellular migration on fibronectin.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
A presença de tremor e distonia de torção no mesmo paciente é frequente mas não há uma explicação satisfatória para isso. Suspeita-se que haja uma associação da distonia idiopática (DI) com o tremor ...essencial (TE). O objetivo deste estudo é analisar a frequência de tremor postural das mãos em pacientes com DI e distonia sintomática (DS). Foram estudados os prontuários de 185 pacientes com o diagnóstico sindrômico de distonia atendidos no Setor de Investigação em Moléstias Extrapiramidais da Escola Paulista de Medicina. DI foi diagnosticada quando não havia anormalidade no exame neurológico além da distonia e havia exames laboratoriais e de neuroimagem, relacionados à distonia, normais e história pregressa negativa para fatores causais de distonia. Foram analisadas as características clínicas da distonia e a presença de tremor postural nas mãos. Havia 185 pacientes, 120 com DI e 65 com DS. Tremor postural das mãos ocorreu em 27 (22,5%) das DI e 14 (21,5%) das DS. Tremor esteve presente nos quadros focais, segmentares e generalizados e também nos diversos tipos clínicos de DI e DS em proporções semelhantes. História familiar de TE estava ausente em todos os casos com tremor. A presença de tremor postural das mãos em pacientes com DI e DS pode sugerir que a desorganização fisiopatológica que produz a distonia pode favorecer o aparecimento do tremor.
The coexistence of tremor and dystonia is usually seen but there is not a satisfactory explanation for it. Some consider that essential tremor (ET) and idiopathic dystonia (ID) may be genetically linked. To clarify this relationship we evaluated the frequency of postural hand tremor in ID and symptomatic dystonia (SD) patients. We studied the records of patients with dystonia seen in our Movement Disorders Unit. ID was considered when there was no other neurological abnormality in the examination aside from dystonia, normal laboratorial tests and neuroimaging related to dystonia, and a negative past history for any known cause for it, except for genetic predisposition. We analyzed the clinical characteristics of dystonia and the occurrence of postural tremor. We collected 185 patients, being 120 with ID and 65 with SD. Tremor was seen in 27 (22.5%) of ID and 14 (21.5%) of SD. Tremor was present in either focal, segmental or generalized dystonia in both ID and SD. Family history for ET was absent in all patients. The similar frequency of tremor in ID and SD patients suggests that the pathophysiologic derangement resulting in dystonia can favor the development of tremor.
PDF
