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  • Articles: DFG German National Licenses  (4)
  • 1995-1999  (1)
  • 1990-1994  (3)
  • Acetylcholinesterase inhibitor  (2)
  • Actin  (1)
  • Alzheimer's disease  (1)
Source
  • Articles: DFG German National Licenses  (4)
Material
Years
  • 1995-1999  (1)
  • 1990-1994  (3)
Year
  • 1
    ISSN: 1420-9071
    Keywords: Alzheimer's disease ; patients' serum ; clotting system ; fibrinolytic system ; plasmin ; urokinase ; thrombin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Previously we reported that there is a kallikrein deficiency in the cerebral tissue of patients with Alzheimer-type dementia. The present study was performed to investigate protease changes in the serum of these patients. The results showed that the kallikrein activity was normal, but that the activities of plasmin and urokinase were significantly low. The present findings indicate a derangement in the clotting and fibrinolytic systems in Alzheimer patients.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1615-6102
    Keywords: Actin ; Cytoskeleton ; Schizosaccharomyces pombe ; Freeze substitution ; Ultrastructure
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Actin distribution and ultrastructure of the fission yeastSchizosaccharomyces pombe treated with cytochalasin A (CA) were investigated by fluorescence microscopy using rhodamine-conjugated phalloidin (rh-ph) and freeze substitution electron microscopy. Among the cytochalasins tested, CA was most effective and at 5 μg/ ml inhibited the appearance of the actin ring at the cell equator at the stage prior to septum formation and the accumulation of actin dots at the septum-forming site both in wild-type cells and the mutantcdc 11, which is defective in septum formation at restrictive temperature. Freeze substitution electron microscopy of CA-treated cells revealed the displacement and morphological alteration of cytoplasmic vesicles and dictyosomes within 30 min and the appearance of dense bodies in the cytoplasm. A sub-population of cytoplasmic vesicles and dictyosomes were insensitive to CA and maintained their original structure. An electron less dense layer containing filamentous material was noted beneath the plasma membrane and thought to be the area of heavy actin patches stained with rh-ph at the cells ends. These results suggest that CA disrupted an actin network that normally maintains the organization of the secretory pathway involving dictyosomes and vesicles.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1573-6903
    Keywords: Acetylcholinesterase inhibitor ; ENA-713 ; GFAP ; delayed neuronal death ; gerbil
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract We examined by morphological methodology the effect of (S)-N-ethyl-3-[(1-dimethyl-amino)ethyl]-N-methyl-phenylcarbamate hydrogentartrate (ENA-713), an acetylcholinesterase (AChE) inhibitor, on ischemia-induced neuronal death in the gerbil hippocampus due to a 5-min ligation of bilateral common carotid arteries after light ether anesthesia. Pyramidal cells had been decreased to 27% of sham-operated controls and the number of hypertrophic astrocytes expressing glial fibrillary acidic protein (GFAP) markedly increased in the hippocampal CA1 subfield 14 days after ischemia. However, post-ischemic administration of ENA-713 (three times 0.2 mg/kg, i.p.) significantly ameliorated this ischemia-induced decrease in the number of pyramidal cells by 47% of sham-operated controls, furthermore, it reduced the ischemia-induced accumulation of GFAP-positive astrocyte in the CA1 region. Together with previous results showing that ENA-713 protected against the ischemia-induced cholinergic abnormalities in the gerbil brain and improved cholinergic dysfunctions in the senescent rat brain, our present findings suggest that ENA-713 prove to be useful for treatment with senile dementia such as cerebrovascular dementia.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1573-6903
    Keywords: Acetylcholinesterase inhibitor ; ENA-713 ; cholinergic indices ; transient ischemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The effects of pre-treatment with ENA-713, an acetylcholinesterase (AChE) inhibitor, on changes in pre- and postsynaptic cholinergic indices in gerbil brain following transient ischemia were studied at 4 and 14 days after recirculation. In the ischemic group, hippocampal acetylcholine (ACh) level was significantly reduced (to 23% of sham-operated controls) at 4 days post-ischemia, but this reduction was completely prevented by ENA-713 treatment. Choline acetyltransferase (ChAT) and cholinesterase (ChE) activities were not significantly changed at 4 and 14 days post-ischemia. Although the maximum number (Bmax) of muscarinic ACh receptor (mACh-R) binding in the hippocampus was decreased (to 44%) without any change in affinity at 14 days post-ischemia, this decrease was also inhibited by ENA-713 treatment. In addition, histological experiment indicated that ENA-713 inhibited ischemia-induced pyramidal cell loss in the hippocampal CA1 regions. Thus, these findings suggest that ENA-713 has protective, neurotrophic and therapeutic effects on cerebrovascular type dementia due to cerebral ischemia.
    Type of Medium: Electronic Resource
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