The aim was to study the blood-brain permeability according to the distribution in the rat brain of Evans blue (EB) and sodium fluorescein (NaFl) administered by an intracarotid injection. Eighteen animals were divided into six groups according to the state of the blood-brain barrier (BBB) at the moment when the dyes were being applied. In the first two groups, the BBB was intact, in groups 3 and 4 the barrier had been opened osmotically prior to the application of the dyes, and in groups 5 and 6 a cellular edema was induced by hyperhydration before administration of the dyes. The intracellular and extracellular distribution of the dyes was studied by fluorescence microscopy. The histological picture thus represented the morphological correlate of the way BBB permeability had been changed before the application of the dyes., P. Kozler, J. Pokorný., and Obsahuje bibliografii
a1_Focal cerebral contusion can be dynamic and expansive. It has been proved that subsequent expansive contusion is caused by brain parenchyma damage, especially BBB damage. We investigated a group of patients with traumatic brain injury. The patients (n=18) were divided in to group I (n=7) of patients submitted to neurosurgery due to expansive contusion, and group II (n=11) of patients without surgery. Serum concentrations of NSE and S-100B protein were measured by electrochemiluminescence immunoassay, interleukin-6 (IL-6) was measured by chemiluminescent sequential immunometric assay and matrix metalloproteinases (MMP-9, MMP-2) were measured by immunoassays. Cortical biopsy specimens of brain were investigated by electron microscopy in patients with trauma brain injury submitted to neurosurgery. Biochemical investigation from first day up to third day after traumatic brain injury proved increased values of IL-6 (302.2±119.9 vs. 59.6±11.9 ng/l, p<0.02) and S-100B protein (3.064±1.064 vs. 0.649±0.182 μ g/l, p<0.05) in patients with expansive lesion compared to patients without expansive contusion. Significantly higher levels of MMP-9 (150.4±28.46 vs. 74.11±13.16 ng/l, p<0.05) and of MMP-2 (814.5±126.3 vs. 523.1±25.28 ng/l, p<0.05) were found during first 3 days after admission in group I compared to group II. MMP-9 has also elevated in group II from lower values after admission (74.11±13.16 ng/l) up to high levels on the 10th day of hospitalization (225.1±49.35 ng/l )., a2_Ultrastructural investigation of endothelial cells and surrounded tissue revealed perivascular hemorrhage, increased pinocytic activity of endothelial cells, and cytotoxic edema of astroglial cells. Multivesical bodies were disclosed inside the endothelial cells. Higher levels of serum protein S-100B and IL-6 correlated with ultrastructural changes of endothelial cells, and with inflammatory response following TBI, respectively., D. Vajtr ... [et al.]., and Obsahuje seznam literatury
In our previous experiments we demonstrated that osmotic opening of the blood brain barrier (BBB) in rats by administration of mannitol into the internal carotid artery leads to cerebral edema. The aim of this study was to confirm objectively the development of brain edema and determine whether it affects spontaneous locomotor activity in rats (SLA). Brain edema was verified by computer tomography (CT) examination of the brain and SLA was observed during open field test. Twenty four adult male rats were divided into four groups of six: (1) control animals (C), (2) controls with anesthesia (CA), (3) controls with sham surgery (CS), (4) experimental - osmotic opening of the BBB (MA). Osmotic BBB disruption manifested by reducing the density of brain tissue (hypodensity), suggesting a higher water content in the brain tissue. SLA was compared between C, CA, CS and MA groups and between MA and CA groups. Significant difference was found only between the control group and MA group. In the first 30 min of the examination, rats after the mannitol administration revealed a marked limitation of spontaneous locomotor activity. Experimental results demonstrated reduction of spontaneous locomotor activity in rats with induced brain edema., P. Kozler, V. Riljak, K. Jandová, J. Pokorný., and Obsahuje bibliografii
Disturbance of capillary perfusions due to leukocyte adhesion, disseminated intravascular coagulat ion, tissue edema is critical components in the pathophysiology of sepsis. Alterations in brain microcirculation during sepsis are not clearly understood. The aim of this study is to gain an improved understanding of alterations through direct visualization of brain microcirculations in an experimental endotoxemi a using intravital microscopy (IVM). Endotoxemia was induced in Lewis rats with Lipopolysaccharide (LPS, 15 mg/kg i.v.). The dura mater was removed via a cranial window to expose the pial vessels on the brain surface. Using fluorescence dyes, plasma extravasation of pial venous vessels and leukocyte-endothelial interaction were visualized by intravital microscopy 4 h after LPS administration. Plasma cytokine levels of IL1-β, IL-6, IFN-γ, TNF-α and KC/GRO were evaluated after IVM. A sign ificant plasma extravasation of the pial venous vessels was found in endotoxemia rats compared to control animals. In addition , a significantly increased number of leukocytes adherent to the pial venous endothelium was observed in septic animals. Endotoxemia also induced a significant elevation of plasma cytokine levels of IL1-β, IL-6, IFN-γ, TNF-α and KC/GRO. Endotoxemia increased permeability in the brain pial vessels accompanied by an increase of leukocyte-endothelium interactions and an increase of inflammatory cytokines in the plasma., J. Zhou ... [et al.]., and Obsahuje bibliografii a bibliografické odkazy
Hormones exert many actions in the brain. Their access and effects in the brain are regulated by the blood-brain barrier (BBB). Hormones as other substances may enter the brain and vice versa either by paracellular way requiring breaching tight junctions stitching the endothelial cells composing the BBB, or by passage through the cells (transcellular way). Hormones influence both ways through their receptors, both membrane and intracellular, present on/in the BBB. In the review the main examples are outlined how hormones influence the expression and function of proteins forming the tight junctions, as well as how they regulate expression and function of major protein transporters mediating transport of various substances including hormone themselves., R. Hampl, M. Bičíková, L. Sosvorová., and Obsahuje bibliografii
Cíl: Zhodnocení nálezů v mozkomíšním moku u dětí s paretickým onemocněním a stanovení výtěžnosti vyšetření vzhledem k etiologické diagnóze. Soubor a metodika: Retrospektivně bylo zhodnoceno vyšetření mozkomíšního moku u 227 hospitalizovaných dětí s paretickým postižením periferního nebo centrálního nervového systému. Mozkomíšní mok byl hodnocen cytologicky a biochemicky. Stanovovány byly protilátky proti neurotropním virům, proti borreliím a ve sporných případech byla provedena i detekce bakteriálních antigenů nebo virové nukleové kyseliny pomocí PCR. Výsledky:Zánětlivé změny ve smyslu aseptické meningitidy byly zjištěny u 125 dětí (55 %), proteinocytologická disociace u devíti dětí (4 %), vyšetření mozkomíšního moku ostatních 93 dětí (41 %) bylo negativní. V cytologickém vyšetření převažovaly lymfocyty (průměr 110, medián 10). Hladina bílkoviny v mozkomíšním moku byla 0,4 g/l (medián) a hladina glukózy 3,34 mmol/l (medián). Porucha hemato‑likvorové bariéry byla zjištěna u 55/113 dětí (51 %), z toho v 9 % těžká. Borreliová etiologie byla prokázána u 52 % dětí, z toho 86 % vzorků mělo současně pleocytózu. Virová a mykoplazmová etiologie byla zjištěna u 11 % dětí pouze sérologicky. Etiologie zůstala neprokázána u 37 % dětí. Závěry:Vyšetření mozkomíšního moku přispívá k diagnostice paretických onemocnění. Navzdory negativním meningeálním příznakům u dětí by měla být provedena lumbální punkce k potvrzení nebo vyloučení meningitidy. V našich zeměpisných podmínkách je periferní paréza n. facialis diagnostikována u 95 % dětí s převahou borreliové etiologie. Paretická postižení jiné etiologie se vyskytují vzácně., Aim: To evaluate cerebrospinal fluid (CSF) findings in children with paretic involvements and to establish the benefit of such examination with a view to aetiological diagnosis. Material and methods: CSF findings among 227 hospitalized children with paretic involvements of the peripheral or central nervous system were evaluated retrospectively. CSF was analysed cytologically and biochemically. Detected were antibodies against neurotropic viruses, Borrelia and viral nucleic acids by means of PCR. Results: Inflammatory changes due to aseptic meningitis were found in 125 (55%) children, elevation of proteins only in nine (4%) children, and CSF examination was negative in the remaining 93 (41%) children. Cytological examination revealed white blood cells with a predominance of lymphocytes (mean 110, median 10). Median CSF protein was 0.4 g/l and median CSF glucose was 3.34 mmol/l. Disruption of the blood‑CSF barrier was determined in 55/113 (51%) children, while this condition was severe in 9% of the examined children. Borrelial aetiology was confirmed in 52% of the children, while pleocytosis was revealed in 86% of those samples. Viral and mycoplasmal aetiology was proven in 11% of the children only serologically. The aetiology remained unproven in 37% of the children. Conclusion:CSF examination contributed to the diagnosis of paretic involvements in children. Even despite negative meningeal signs in children, spinal tap should be performed to exclude or confirm meningitis. In our geographic conditions, peripheral facial palsy is diagnosed in 95% of children with the predominance of borrelial aetiology. Paretic involvements of other aetiologies occur only rarely., and L. Krbková, K. Holečková, Z. Blechová, V. Marešová, K. Labská, H. Štroblová, J. Bednářová
Ongoing interest in brain ischemia research has provided data showing that ischemia may be involved in the pathogenesis of Alzheimer disease. Brain ischemia in the rat produces a stereotyped pattern of selectiv e neuronal degeneration, which mimics early Alzheimer disease pathology. The objective of this study was to further develop an d characterize cardiac arrest model in rats, which provides practical way to analyze Alzheimer- type neurodegeneration. Rats were made ischemic by cardiac arrest. Blood-brain barrier (BBB) insufficiency, accumulation of different parts of amyloid precursor protein (APP) and platelets inside and outside BBB vessels were investigated in ischemic brain up to 1-year survival. Isch emic brain tissue demonstrated haphazard BBB changes. Toxic fr agments of APP deposits were associated with the BBB vessels. Moreover our study revealed platelet aggregates in- and outside BBB vessels. Toxic parts of APP and platelet aggregates correlated very well with BBB permeability. Progressive injury of the ischemic brain parenchyma may be caused not only by a degeneration of neurons destroyed during ischemia but also by chronic damage in BBB. Chronic ischemic BBB insufficiency with accumulation of toxic components of APP in the brain tissue perivascular space, may gradually over a lifetime, progress to brain atrophy and to full blown Alzheimer-type pathology., M. Jabłoński., and Obsahuje bibliografii a bibliografické odkazy
A number of clinical neurological pathologies are associated with increased permeability of the blood brain barrier (BBB). Induced changes of the homeostatic mechanisms in the brain microenvironment lead among others to cellular changes in the CNS. The question was whether some of these changes can be induced by osmotic opening of BBB in an in vivo experiment and whether they can be detected in cerebrospinal fluid (CSF). CSF was taken via the suboccipital puncture from 10 healthy rats and six rats after the osmotic opening of the BBB. In all 16 animals, concentration of myelin basic protein (MBP ng/ml), Neuron-specific enolase (NSE ng/ml) and Tau-protein (Tau pg/ml) were determined in CSF by ELISA. Values in both groups were statistically evaluated. Significant difference between the control and experimental group was revealed only for the concentration of myelin basic protein (p<0.01). The presented results indicate that osmotic opening of the BBB in vivo experiment without the presence of other pathological conditions of the brain leads to a damage of myelin, without impairment of neurons or their axons., P. Kozler, O. Sobek, J. Pokorný., and Obsahuje bibliografii