232 research outputs found
Electrophysiological and Morphological Properties of Embryonic Neocortical Grafts Developing in Different Regions of the Host Rat Brain
Parallel morphological and electrophysiological studies of embryonic neocortical tissue (primordia of anterior parietalβpresumptive sensorimotorβcortex) grafted into different regions of the host adult brain (sensori-motor cortex, caudate-putamen, septum or thalamus) were carried out to investigate to what extent the properties of transplanted embryonic neocortexβan advanced organizational form of neuronal tissueβare affected by homotopic or heterotopic surroundings
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TGFΞ² signaling is associated with changes in inflammatory gene expression and perineuronal net degradation around inhibitory neurons following various neurological insults.
Brain damage due to stroke or traumatic brain injury (TBI), both leading causes of serious long-term disability, often leads to the development of epilepsy. Patients who develop post-injury epilepsy tend to have poor functional outcomes. Emerging evidence highlights a potential role for blood-brain barrier (BBB) dysfunction in the development of post-injury epilepsy. However, common mechanisms underlying the pathological hyperexcitability are largely unknown. Here, we show that comparative transcriptome analyses predict remodeling of extracellular matrix (ECM) as a common response to different types of injuries. ECM-related transcriptional changes were induced by the serum protein albumin via TGFΞ² signaling in primary astrocytes. In accordance with transcriptional responses, we found persistent degradation of protective ECM structures called perineuronal nets (PNNs) around fast-spiking inhibitory interneurons, in a rat model of TBI as well as in brains of human epileptic patients. Exposure of a naΓ―ve brain to albumin was sufficient to induce the transcriptional and translational upregulation of molecules related to ECM remodeling and the persistent breakdown of PNNs around fast-spiking inhibitory interneurons, which was contingent on TGFΞ² signaling activation. Our findings provide insights on how albumin extravasation that occurs upon BBB dysfunction in various brain injuries can predispose neural circuitry to the development of chronic inhibition deficits
ΠΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΡ Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΡΡΠ΅Π»ΠΊΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠΈΡΠ΅Π»Π° ΠΏΡΡΠ΅ΠΌ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΡ ΠΊΠ°Π½Π°Π»ΠΎΠ²
Π‘ΡΠ°ΡΡΡ ΠΏΡΠΈΡΠ²ΡΡΠ΅Π½Π° ΠΏΡΠ΄Π²ΠΈΡΠ΅Π½Π½Ρ Π΅ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ Π²ΡΡΡΠΈΠ·Π½ΡΠ½ΠΎΠ³ΠΎ Π°Π²ΡΠ°ΡΡΠΉΠ½ΠΎΠ³ΠΎ ΠΏΠ°ΡΠΊΡ Π²Π½Π°ΡΠ»ΡΠ΄ΠΎΠΊ ΠΌΠΎΠ΄Π΅ΡΠ½ΡΠ·Π°ΡΡΡ Π°Π²ΡΠ°ΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΡΡΡΠ»Π΅ΡΡΠΊΠΎΠ³ΠΎ ΠΏΡΠΈΡΡΠ»Ρ. ΠΠ΄Π½ΠΈΠΌ Π· Π³ΠΎΠ»ΠΎΠ²Π½ΠΈΡ
Π½Π°ΠΏΡΡΠΌΠΊΡΠ² ΠΌΠΎΠ΄Π΅ΡΠ½ΡΠ·Π°ΡΡΡ Ρ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ²Π°Π½Π½Ρ ΡΠ½ΡΠΎΡΠΌΠ°ΡΡΠΉΠ½ΠΈΡ
ΠΊΠ°Π½Π°Π»ΡΠ² Π² ΠΏΡΠΈΡΡΠ»Ρ. ΠΡΠ½ΡΡΡΡ Π²Π°ΡΡΠ°Π½ΡΠΈ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ²Π°Π½Π½Ρ Π½Π΅ Π΄Π°ΡΡΡ ΠΎΡΡΠΊΡΠ²Π°Π½ΠΎΠ³ΠΎ ΠΏΡΠ΄Π²ΠΈΡΠ΅Π½Π½Ρ Π΅ΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΡΠ·-Π·Π° Π²Π΅Π»ΠΈΠΊΠΈΡ
ΠΏΠΎΡ
ΠΈΠ±ΠΎΠΊ Π°Π±ΠΎ Π·Π½Π°ΡΠ½ΠΈΡ
Π³Π°Π±Π°ΡΠΈΡΡΠ² Π±Π»ΠΎΠΊΡΠ² ΠΏΡΠΈΡΡΠ»Ρ. ΠΠ΅ΡΠΎΡ Π΄Π°Π½ΠΎΡ ΡΠΎΠ±ΠΎΡΠΈ Ρ Π°Π½Π°Π»ΡΠ· ΠΌΠΎΠΆΠ»ΠΈΠ²ΠΈΡ
Π²Π°ΡΡΠ°Π½ΡΡΠ² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ²Π°Π½Π½Ρ ΡΠ½ΡΠΎΡΠΌΠ°ΡΡΡ Π² ΠΏΡΠΈΡΡΠ»Ρ Π΄Π»Ρ ΠΉΠΎΠ³ΠΎ ΠΌΠΎΠ΄Π΅ΡΠ½ΡΠ·Π°ΡΡΡ Π· ΠΎΠ³Π»ΡΠ΄Ρ Π½Π° ΠΌΠΎΠΆΠ»ΠΈΠ²ΡΡΡΡ ΡΡ
ΡΠ΅Π°Π»ΡΠ·Π°ΡΡΡ. ΠΡΠ»Π° Π·Π°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½Π° ΡΡ
Π΅ΠΌΠ° ΠΊΠΎΠΌΠ±ΡΠ½ΠΎΠ²Π°Π½ΠΎΡ Π²ΡΠ·ΠΈΡΠ½ΠΎΡ Π³ΠΎΠ»ΠΎΠ²ΠΊΠΈ Π· ΡΡΠ΄ΠΊΠΎΠΊΡΠΈΡΡΠ°Π»ΡΡΠ½ΠΈΠΌ ΡΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠΎΠΌ Π΄Π»Ρ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ²Π°Π½Π½Ρ ΡΠ½ΡΠΎΡΠΌΠ°ΡΡΡ Π² ΠΏΡΠΈΡΡΠ»Ρ. ΠΠΎΠΏΠ΅ΡΠ΅Π΄Π½Ρ ΡΠΎΠ·ΡΠ°Ρ
ΡΠ½ΠΊΠΈ ΠΏΡΠ΄ΡΠ²Π΅ΡΠ΄ΠΆΡΡΡΡ ΠΌΠΎΠΆΠ»ΠΈΠ²ΡΡΡΡ ΠΏΡΠ°ΠΊΡΠΈΡΠ½ΠΎΡ ΡΠ΅Π°Π»ΡΠ·Π°ΡΡΡ Π·Π°ΠΏΡΠΎΠΏΠΎΠ½ΠΎΠ²Π°Π½ΠΎΠ³ΠΎ ΡΡΡΠ΅Π½Π½Ρ. ΠΠ°Π΄Π°Π»Ρ ΠΏΠ΅ΡΠ΅Π΄Π±Π°ΡΠ°ΡΡΡΡΡ Π΄ΠΎΠΏΡΠ°ΡΡΠΎΠ²ΡΠ²Π°ΡΠΈ ΡΡ
Π΅ΠΌΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΡΠ²Π°Π½Π½Ρ Ρ Π½Π°ΠΏΡΡΠΌΡ ΠΎΡΡΠ½ΠΊΠΈ ΡΡ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π²ΡΡΠ»Π΅Π½Π½Ρ.The article is devoted the increase of efficiency of domestic aviation park due to modernization of aviation sight. Information fusion is one of main sight modernization directions. The existent variants of information fusion in sight do not give the expected increasing of efficiency on account of large errors or considerable sizes of sight units. The purpose of this work is an analysis of possible variants of information fusion in a sight for it's modernization, taking into account possibility of their realization. The chart of the combined liquid-crystal viewfinder was offered for information fusion. Previous calculations confirm possibility of practical realization of the decision. In future it is foreseen to finish off the fusion chart to estimate its structural embodiment.Π‘ΡΠ°ΡΡΡ ΠΏΠΎΡΠ²ΡΡΠ΅Π½Π° ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΎΡΠ΅ΡΠ΅ΡΡΠ²Π΅Π½Π½ΠΎΠ³ΠΎ Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΠΏΠ°ΡΠΊΠ° Π·Π° ΡΡΠ΅Ρ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ Π°Π²ΠΈΠ°ΡΠΈΠΎΠ½Π½ΠΎΠ³ΠΎ ΡΡΡΠ΅Π»ΠΊΠΎΠ²ΠΎΠ³ΠΎ ΠΏΡΠΈΡΠ΅Π»Π°. ΠΠ΄Π½ΠΈΠΌ ΠΈΠ· Π³Π»Π°Π²Π½ΡΡ
Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΉ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ ΡΠ²Π»ΡΠ΅ΡΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΠ΅ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΎΠ½Π½ΡΡ
ΠΊΠ°Π½Π°Π»ΠΎΠ² Π² ΠΏΡΠΈΡΠ΅Π»Π΅. Π‘ΡΡΠ΅ΡΡΠ²ΡΡΡΠΈΠ΅ Π²Π°ΡΠΈΠ°Π½ΡΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π½Π΅ Π΄Π°ΡΡ ΠΎΠΆΠΈΠ΄Π°Π΅ΠΌΠΎΠ³ΠΎ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΠΈ ΠΈΠ·-Π·Π° Π±ΠΎΠ»ΡΡΠΈΡ
ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎΡΡΠ΅ΠΉ ΠΈΠ»ΠΈ Π·Π½Π°ΡΠΈΡΠ΅Π»ΡΠ½ΡΡ
Π³Π°Π±Π°ΡΠΈΡΠΎΠ² Π±Π»ΠΎΠΊΠΎΠ² ΠΏΡΠΈΡΠ΅Π»Π°. Π¦Π΅Π»ΡΡ Π΄Π°Π½Π½ΠΎΠΉ ΡΠ°Π±ΠΎΡΡ ΡΠ²Π»ΡΠ΅ΡΡΡ Π°Π½Π°Π»ΠΈΠ· Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΡΡ
Π²Π°ΡΠΈΠ°Π½ΡΠΎΠ² ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π² ΠΏΡΠΈΡΠ΅Π»Π΅ Π΄Π»Ρ Π΅Π³ΠΎ ΠΌΠΎΠ΄Π΅ΡΠ½ΠΈΠ·Π°ΡΠΈΠΈ, ΡΡΠΈΡΡΠ²Π°Ρ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΈΡ
ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ. ΠΡΠ»Π° ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π° ΡΡ
Π΅ΠΌΠ° ΠΊΠΎΠΌΠ±ΠΈΠ½ΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠΉ Π²ΠΈΠ·ΠΈΡΠ½ΠΎΠΉ Π³ΠΎΠ»ΠΎΠ²ΠΊΠΈ Ρ ΠΆΠΈΠ΄ΠΊΠΎΠΊΡΠΈΡΡΠ°Π»Π»ΠΈΡΠ΅ΡΠΊΠΈΠΌ ΠΈΠ½Π΄ΠΈΠΊΠ°ΡΠΎΡΠΎΠΌ Π΄Π»Ρ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠΈ Π² ΠΏΡΠΈΡΠ΅Π»Π΅. ΠΡΠ΅Π΄ΡΠ΄ΡΡΠΈΠ΅ ΡΠ°ΡΡΠ΅ΡΡ ΠΏΠΎΠ΄ΡΠ²Π΅ΡΠΆΠ΄Π°ΡΡ Π²ΠΎΠ·ΠΌΠΎΠΆΠ½ΠΎΡΡΡ ΠΏΡΠ°ΠΊΡΠΈΡΠ΅ΡΠΊΠΎΠΉ ΡΠ΅Π°Π»ΠΈΠ·Π°ΡΠΈΠΈ ΠΏΡΠ΅Π΄Π»ΠΎΠΆΠ΅Π½Π½ΠΎΠ³ΠΎ ΡΠ΅ΡΠ΅Π½ΠΈΡ. Π Π΄Π°Π»ΡΠ½Π΅ΠΉΡΠ΅ΠΌ ΠΏΡΠ΅Π΄ΡΡΠΌΠ°ΡΡΠΈΠ²Π°Π΅ΡΡΡ Π΄ΠΎΡΠ°Π±Π°ΡΡΠ²Π°ΡΡ ΡΡ
Π΅ΠΌΡ ΠΊΠΎΠΌΠΏΠ»Π΅ΠΊΡΠΈΡΠΎΠ²Π°Π½ΠΈΡ Π² Π½Π°ΠΏΡΠ°Π²Π»Π΅Π½ΠΈΠΈ ΠΎΡΠ΅Π½ΠΊΠΈ Π΅Π΅ ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΠ²Π½ΠΎΠ³ΠΎ Π²ΠΎΠΏΠ»ΠΎΡΠ΅Π½ΠΈΡ
TGFΞ² signaling is associated with changes in inflammatory gene expression and perineuronal net degradation around inhibitory neurons following various neurological insults
Brain damage due to stroke or traumatic brain injury (TBI), both leading
causes of serious long-term disability, often leads to the development of
epilepsy. Patients who develop post-injury epilepsy tend to have poor
functional outcomes. Emerging evidence highlights a potential role for blood-
brain barrier (BBB) dysfunction in the development of post-injury epilepsy.
However, common mechanisms underlying the pathological hyperexcitability are
largely unknown. Here, we show that comparative transcriptome analyses predict
remodeling of extracellular matrix (ECM) as a common response to different
types of injuries. ECM-related transcriptional changes were induced by the
serum protein albumin via TGFΞ² signaling in primary astrocytes. In accordance
with transcriptional responses, we found persistent degradation of protective
ECM structures called perineuronal nets (PNNs) around fast-spiking inhibitory
interneurons, in a rat model of TBI as well as in brains of human epileptic
patients. Exposure of a naΓ―ve brain to albumin was sufficient to induce the
transcriptional and translational upregulation of molecules related to ECM
remodeling and the persistent breakdown of PNNs around fast-spiking inhibitory
interneurons, which was contingent on TGFΞ² signaling activation. Our findings
provide insights on how albumin extravasation that occurs upon BBB dysfunction
in various brain injuries can predispose neural circuitry to the development
of chronic inhibition deficits
miRSwitch: detecting microRNA arm shift and switch events
Arm selection, the preferential expression of a 3β² or 5β² mature microRNA (miRNA), is a highly dynamic and tissue-specific process. Time-dependent expression shifts or switches between the arms are also relevant for human diseases. We present miRSwitch, a web server to facilitate the analysis and interpretation of arm selection events. Our species-independent tool evaluates pre-processed small non-coding RNA sequencing (sncRNA-seq) data, i.e. expression matrices or output files from miRNA quantification tools (miRDeep2, miRMaster, sRNAbench). miRSwitch highlights potential changes in the distribution of mature miRNAs from the same precursor. Group comparisons from one or several user-provided annotations (e.g. disease states) are possible. Results can be dynamically adjusted by choosing from a continuous range of highly specific to very sensitive parameters. Users can compare potential arm shifts in the provided data to a human reference map of pre-computed arm shift frequencies. We created this map from 46 tissues and 30 521 samples. As case studies we present novel arm shift information in a Alzheimerβs disease biomarker data set and from a comparison of tissues in Homo sapiens and Mus musculus. In summary, miRSwitch offers a broad range of customized arm switch analyses along with comprehensive visualizations, and is freely available at: https://www.ccb.uni-saarland.de/mirswitch/
Medium Effects in Cooling of Neutron Stars and Neutron Gap
We study the dependence of the cooling of isolated neutron stars on the
magnitude of the neutron gap. It is demonstrated that our ``nuclear
medium cooling'' scenario is in favor of a suppressed value of the
neutron gap.Comment: 18 p., 12 figs., extended version of astro-ph/0501678, accepted in
A&
Baryon superfluidity and neutrino emissivity of neutron stars
For neutron stars with hyperon-mixed core, neutrino emissivity is studied
under the equation of state, obtained by introducing repulsive three-body force
universal for all baryons so as to assure the maximum mass compatible with the
observation. By paying attention to the density-dependence of critical
temperatures of baryon superfluids, which reflect the nature of baryon-baryon
interaction and control neutron star cooling, we show what neutrino emission
processes are efficient in the regions with and without hyperon mixing and
remark its implications related to neutron star cooling.Comment: 5pages, 4 figure
Contribution of the massive photon decay channel to neutrino cooling of neutron stars
We consider massive photon decay reactions via intermediate states of
electron-electron-holes and proton-proton-holes into neutrino-antineutrino
pairs in the course of neutron star cooling. These reactions may become
operative in hot neutron stars in the region of proton pairing where the photon
due to the Higgs-Meissner effect acquires an effective mass that
is small compared to the corresponding plasma frequency. The contribution of
these reactions to neutrino emissivity is calculated; it varies with the
temperature and the photon mass as
for . Estimates show that these processes appear as extra
efficient cooling channels of neutron stars at temperatures K.Comment: accepted to publication in Zh. Eksp. Teor. Fiz. (JETP
Equation of State for Hot and Dense Matter: -- Model with Scaled Hadron Masses and Couplings
The proposed earlier relativistic mean-field model with hadron masses and
coupling constants depending on the -meson field is generalized to
finite temperatures. Within this approach we simulate the in-medium behavior of
the hadron masses motivated by the Brown-Rho scaling. The high-lying baryon
resonances and boson excitations as well as excitations of the ,
and fields interacting via mean fields are incorporated into
this scheme. Thermodynamic properties of hot and dense hadronic matter are
elaborated with the constructed equation of state. Even at zero baryon density,
effective masses of --- excitations abruptly drop down
for T\gsim 170 MeV and reach zero at a critical temperature
MeV. Below (at MeV) the
specific heat gets a peak like at crossover. We demonstrate that our EoS can be
matched with that computed on the lattice for high temperatures provided the
baryon resonance couplings with nucleon are partially suppressed. In this case
the quark liquid would masquerade as the hadron one. The model is applied to
description of heavy ion collisions in a broad collision energy range. It might
be especially helpful for studying phase diagram in the region near possible
phase transitions.Comment: 53 pages, 16 figures; minor changes made, references adde
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