Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Acta neuropathologica 74 (1987), S. 329-334 
    ISSN: 1432-0533
    Keywords: Cerebromicrovascular endothelium ; Arachidonic acid ; Indomethacin ; Dexamethasone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Permeability of cerebromicrovascular endothelium has been investigated in a new model of cultured cells. The endothelial cells are grown on dextran microcarriers and constitute a barrier for trypan blue (TB) binding to the dextran beads. Changes in the permeability of microcarrier-cultured endothelium have been investigated during the exposure of cells to arachidonic acid or substances involved either in arachidonate metabolism or stimulation of cAMP. The results demonstrate enhanced TB passage through the endothelial barrier during exposure to high concentrations of arachidonic acid and indomethacin, but not to ibuprofen. The effect of indomethacin could be prevented by pretreatment with dexamethasone. Dexamethasone alone did not influence the barrier. Forskolin, a drug which stimulates the catalytic unit of adenylate cyclase, did not affect the endothelial permeability to TB. These findings support the contention that substances derived from a disturbed cellular membrane contribute to the altered blood-brain barrier function found under pathological conditions.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 1432-0533
    Keywords: Cerebromicrovascular endothelium ; Arachidonic acid ; Lipid peroxidation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary The relationship of free arachidonic acid (AA) to cellular permeability, lipid peroxidation and physical state “fluidity” of the membrane was investigated in cultured endothelial cells (EC) dissociated from cerebral microvessels of rats. The results demonstrate that AA can induce a reversible alteration of endothelial permeability to trypan blue albumin (TBA). Exposure of EC to AA increases membrane “fluidity” as measured by fluorescence anisotropy using 1,6-diphenyl-1,3,5 hexatriene as a fluorescent probe. The AA modification of EC membrane “fluidity” is not associated with changes in EC permeability. Addition of AA and H2O2 to the incubation medium of EC leads to persistant alteration of EC permeability which can be prevented by catalase treatment. Both AA and H2O2 induce a greater formation of malondialdehyde, the product of lipid peroxidation, than AA alone. These findings strongly suggest that a release of AA either from the capillary or cellular membrane of the brain under a pathological condition may alone or through a peroxidative process alter the function of blood-brain barrier.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The effect of ischemia on the properties of 5-hydroxytryptamine1A+B (5-HT1A+B) and 5-hydroxytrypt-amine1B5-HT1B) binding sites, physical-state “fluidity” of the membrane, and its susceptibility to peroxidation in vitro was investigated in the cerebral cortex of gerbils. Ischemia was induced by bilateral carotid artery occlusion for 15 min alone or with release for 1 h. Ischemia both with and without reflow decreased the number of 5-HT1A+B and 5-HT1B binding sites, whereas ischemia and reflow altered the affinity for 5-HT1B binding sites. Resistance to the temperature-dependent increase in “fluidity” of the membrane was detected (by fluorescence anisotropy using l,6-diphenyl-l,3,5-hexatriene as a probe) after ischemia and reflow but not in ischemia alone. Susceptibility of the membranes to Fe2+- and ascorbic acid-stimulated lipid peroxidation in vitro was decreased following ischemia and recirculation only. These findings strongly suggest that the composition and the function of the membrane are markedly disturbed during recirculation after ischemia.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Neurochemical research 20 (1995), S. 195-199 
    ISSN: 1573-6903
    Keywords: Cerebral ischemia ; synaptosomal uptake ; glutamate transport
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract In the present investigation we studied the synaptosomal uptake of glutamate in brain omogenate of Mongolian gerbils submitted to bilateral common carotid occlusion, with and without subsequent return of blood flow. The results show that glutamate uptake after ischemia is reduced by about 35% The damage appears to be persistent, since return of blood flow restores uptake only slightly. The membrane alterations occurring in ischemia could explain the persistence of glutamate transporter impairment. Besides the blockade of NMDA receptors, the stimulation and/or the protection of the uptake systems for glutamate could be of help in preventing neuronal ischemic damage.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Neurological sciences 16 (1995), S. 459-465 
    ISSN: 1590-3478
    Keywords: Attack therapy ; Migraine without aura ; Treatment guidelines
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Sommario Abbiamo esaminato il trattamento farmacologico dell'attacco acuto, usato da 200 pazienti sofferenti di emicrania senza aura (criteri IHS 1988), visitati nel periodo 1989–1991. È stata raccolta una dettagliata analisi farmacologica sulle terapie d'attacco usate dai pazienti nel corso della loro storia cefalalgica precedentemente alla prima visita presso il nostro ambulatorio. Sono state studiate le seguenti variabili: tipo di farmaco usato, dosaggio e via di somministrazione, efficacia del trattamento, frequenza e tipo degli effetti indesiderati; questi parametri sono stati confrontati con le linee guida della Società Italiana per lo Studio delle Cefalee (SISC, 1993). I farmaci più comunemente usati sono gli antiinfiammatori non steroidei; abbiamo osservato un analogo uso delle associazioni, in particolare propifenazone ed acido barbiturico. I pirazolonici propifenazone ed amidopirina, non consigliati nelle linee guida, sono anch'essi largamente usati. Il nostro studio evidenzia il fatto che l'utilizzo corrente dei farmaci differisce in molti aspetti da quello suggerito dalle linee guida.
    Notes: Abstract We assessed the attack drugs taken by 200 migraine without aura patients (International Headache Society criteria, 1988) between 1989 and 1991. A detailed pharmacological history regarding the acute attack therapy adopted up until our initial visit was gathered, including the type of drug used, dosage, administration route, the time of starting therapy, treatment efficacy, and the frequency and types of undesirable effects, all of which were subsequently compared with the guidelines (1993) of the Italian Society for the Study of Headache (SISC). The most commonly used are non steroidal anti-inflammatory drugs (NSAIDs). We observed a similar high frequency in the use of combinations, particularly prophyphenazone and barbituric acid. The pirazolones, such as noramidopyrine and prophyphenazone, are also widely used as single agents, even though they are not considered by the guidelines. Our study underlines the fact that current drug use differs in several respects from the guidelines.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...