Leucine Zipper-Bearing Kinase Is a Critical Regulator of Astrocyte Reactivity in the Adult Mammalian CNS.

Reactive astrocytes influence post-injury recovery, repair, and pathogenesis of the mammalian CNS. Much of the regulation of astrocyte reactivity, however, remains to be understood. Using genetic loss and gain-of-function analyses in vivo, we show that the conserved MAP3K13 (also known as leucine zipper-bearing kinase [LZK]) promotes astrocyte reactivity and glial scar formation after CNS injury. Inducible LZK gene deletion in astrocytes of adult mice reduced astrogliosis and impaired glial scar formation, resulting in increased lesion size after spinal cord injury. Conversely, LZK overexpression in astrocytes enhanced astrogliosis and reduced lesion size. Remarkably, in the absence of injury, LZK overexpression alone induced widespread astrogliosis in the CNS and upregulated astrogliosis activators pSTAT3 and SOX9. The identification of LZK as a critical cell-intrinsic regulator of astrocyte reactivity expands our understanding of the multicellular response to CNS injury and disease, with broad translational implications for neural repair

Presynaptic actions of 4-Aminopyridine and γ-aminobutyric acid on rat sympathetic ganglia in vitro

Responses to bath-applications of 4-aminopyridine (4-AP) and -aminobutyric acid (GABA) were recorded intracellularly from neurones in the rat isolated superior cervical ganglion. 4-aminopyridine (0.1–1.0 mmol/l) usually induced spontaneous action potentials and excitatory postsynaptic potentials (EPSPs), which were blocked by hexamethonium. Membrane potential was unchanged; spike duration was slightly increased. Vagus nerve B-and C-fibre potentials were prolonged. In 4-AP solution (0.1–0.3 mmol/l), GABA (0.1 mmol/l), 3-aminopropanesulphonic acid or muscimol evoked bursts of spikes and EPSPs in addition to a neuronal depolarization. These bursts, which were not elicited by glycine, glutamate, taurine or (±)-baclofen, were completely antagonised by hexamethonium, tetrodotoxin or bicuculline methochloride. It is concluded that: (a) 4-AP has a potent presynaptic action on sympathetic ganglia; (b) presynaptic actions of GABA can be recorded postsynaptically in the presence of 4-AP; and (c) the presynaptic GABA-receptors revealed in this condition are similar to those on the postsynaptic membrane

Kinetic Properties of a Bose-Einstein Gas at Finite Temperature

We study, in the framework of the Boltzmann-Nordheim equation (BNE), the kinetic properties of a boson gas above the Bose-Einstein transition temperature $T_c$. The BNE is solved numerically within a new algorithm, that has been tested with exact analytical results for the collision rate of an homogeneous system in thermal equilibrium. In the classical regime ($T > 6~ T_c$), the relaxation time of a quadrupolar deformation in momentum space is proportional to the mean free collision time $\tau_{relax} \sim T^{-1/2}$. Approaching the critical temperature ($T_c < T < 2.7~ T_c$), quantum statistic effects in BNE become dominant, and the collision rate increases dramatically. Nevertheless, this does not affect the relaxation properties of the gas that depend only on the spontaneous collision term in BNE. The relaxation time $\tau_{relax}$ is proportional to $(T - T_c)^{-1/2}$, exhibiting a critical slowing down. These phenomena can be experimentally confirmed looking at the damping properties of collective motions induced on trapped atoms. The possibility to observe a transition from collisionless (zero-sound) to hydrodynamic (first-sound) is finally discussed.Comment: RevTeX, 5 figures. Submitted to Phys. Rev.

»Über den Namen der Germanisten«

Der Titel der am 10. Mai 1988 gehaltenen Antrittsvorlesung von Prof. Dr. Uwe Meves zitiert den für die erste Germanistenversammlung (Frankfurt am Main 1848) verfaßten Beitrag von Jacob Grimm. Der germanistischen Fachgeschichtsschreibung galt Jacob Grimms Rede bislang als frühester Beleg für die Übertragung der bis dahin auf die Erforschung des germanisch-deutschen Rechts beschränkten Bezeichnung "Germanist" auch auf die Erforscher der deutschen Literatur und Sprache. Meves weist nach, daß der Terminus "Germanist" für die Vertreter der germanistischen bzw. deutschen Philologie schon vor 1846 verwendet wurde. Er lenkt die Aufmerksamkeit insbesondere auf den von der germanistischen Wissenschaftsgeschichte bisher unbeachtet gebliebenen Pädagogen Karl W. E. Mager (1810-1858), der den "Germanisten" in eine europäische Perspektive einband und die Universität als Stätte der Lehrerausbildung reflektierte

Die Plastosomentheorie der Vererbung: Eine Antwort auf verschiedene Einwände

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Total Occlusion of the Internal Carotid Artery by Subacute In-Stent Thrombosis and Subsequent Spontaneous Recanalization After Stent-Assisted Coil Embolization

We present a 61-year-old female with an unruptured intracranial aneurysm on the left superior hypophyseal artery. The patient was treated with endovascular management, stent-assisted coil embolization. Multiple embolic infarction and total occlusion of the left internal carotid artery (ICA) was occurred one day later. At 14 days of heparinization, complete recanalization of the ICA and full recovery of neurologic symptoms were achieved. Stent-assisted coil embolization is not without risk of instent thrombosis and the subsequent embolism. The cause of subacute in-stent thrombosis and natural course were uncertain; however, the clinical course may potentially be fatal. Therefore, rapid diagnosis and proper treatment are recommended

Tratamento conservador da fratura toracolombar explosão e Classificação de McComack

OBJETIVO: Correlacionar a classificação de McCormack e o resultado funcional nos portadores de fratura toracolombar explosão tratados com gesso em hiper-extensão ou ortese toracolombossacra. MÉTODOS: Análise retrospectiva de prontuários, radiografias e de tomografia de 31 pacientes no período de 1996 a 2005. O resultado funcional ao final do tratamento obtido mediante as escalas funcionais de dor e trabalho de Denis. RESULTADOS: Dos 31 pacientes avaliados, cinco apresentavam incapacidade total ou parcial para retorno ao trabalho ao final do período de segmento; 26 (83,9 %) estavam aptos ao trabalho com ou sem mudança da atividade trabalhista. Em relação à dor (r=0,258;p=0,161) e função (r=0,204;p=0,272), não houve correlação entre a pontuação da classificação e a função no final do acompanhamento. CONCLUSÃO: Considerando critérios funcionais centrados nos pacientes, não observamos correlação entre a Classificação de McCormack e os resultados do tratamento conservador. Nivel de Evidência IV, série de casos.</jats:p