Krzysztof Janeczko

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The present study focuses on application of quantitative methods measuring differences between particular morphological types of microglial cells as well as between their proliferating and non-proliferating examples. On the basis of subjective classification, microglial cells of three morphological types (ramified, hypertrophied and bushy) were selected(More)
Pathogenic stimuli induce alterations in the morphology of microglial cells. We analysed changes in lectin-stained cells on the 1st, 3rd, 7th or 14th day after transient global ischemia. Three areas differing in the degree of microglial reaction were selected for analysis: the upper cerebral cortex, the hippocampal CA1 area, and the hilus of the dentate(More)
Proliferative response of astrocytes to unilateral injury of the cerebral hemisphere was investigated in 30-day-old rats using a combination of [3H]thymidine autoradiography and immunocytochemical staining for glial fibrillary acidic protein. At different intervals following injury the animals were injected with [3H]thymidine and the distribution of(More)
Morphological transformation of lectin-positive microglia/macrophages in the developing rat cerebral hemisphere was analysed using quantitative methods. During the first postnatal month, the cells showed increases in their size and fractal dimension accompanied by a simultaneous decrease in their solidity. Regional variations in dynamics of the process(More)
We have examined the effect of global transient cerebral ischemia, evoked in rat by 10 min of cardiac arrest, upon the changes in the cellular expression of two nerve growth factor (NGF) receptors (TrkA and p75) in the hippocampus. We have used immunocytochemical procedures, including a quantitative analysis of staining, along with some quantitative(More)
In the brain, injury-induced gliosis and axonal sprouting have been regarded as age-dependent repairing processes with, unfortunately, epileptogenic effects. The present study examines whether brains injured at different developmental stages become more or less susceptible to experimentally-induced status epilepticus. In 6- and 30-day-old Wistar rats (P6s(More)
Transient global ischemia induces intensive neuronal degeneration in the hippocampal CA1 pyramidal layer, accompanied by reactive transformation of glial cells. Previously, we have shown using the double immunostaining method that the NGF receptors (NGFR) p75 and TrkA are expressed mainly on subpopulations of GFAP+ astrocytes, and this expression increases(More)
  • K Janeczko
  • International journal of developmental…
  • 1993
Changes in the distribution of proliferating astrocytes expressing glial fibrillary acidic protein (GFAP) and/or vimentin were examined in the injured cerebral hemisphere in adult mice. The injury was followed by [3H]thymidine injections at different time intervals. The brain sections were doubly immunostained for GFAP and vimentin and subjected to(More)
Astrocyte response to unilateral injury of the cerebral hemisphere in newborn rats was studied both autoradiographically and immunocytochemically. Within the lesion area zones of increased number of labelled astrocytes were delimited. They were considered as evidence of reactive astrocyte proliferation in the rat brain injured at birth.
Temporal lobe epilepsy (TLE) is the most common type of epilepsy in adults. Of the animal models developed to investigate the pathogenesis of TLE, the one with pilocarpine-induced seizures is most often used. After pilocarpine administration in animals, three distinct periods--acute, latent, and chronic--can be distinguished according to their behavior. The(More)