抗原变异可使得多种致病微生物易于逃避宿主免疫应答。表达在感染红细胞表面的恶性疟原虫红细胞表面蛋白1（PfPMP1）与感染红细胞、内皮细胞、树突状细胞以及胎盘的单个或多个受体作用，在黏附及免疫逃避中起关键的作用。每个单倍体基因组var基因家族编码约60种成员，通过启动转录不同的var基因变异体为抗原变异提供了分子基础。

疟原虫var基因转换速率变化导致抗原变异[英]／Paul H, Robert P, Christodoulou Z, et al//Proc Natl Acad Sci U S A

Prelude. Cycle 1. Introduction. Cycle 2. Structure defines function. Cycle 3. Diversity of cortical functions is provided by inhibition. Cycle 4. Windows on the brain. Cycle 5. A system of rhythms: from simple to complex dynamics. Cycle 6. Synchronization by oscillation. Cycle 7. The brain's default state: self-organized oscillations in rest and sleep. Cycle 8. Perturbation of the default patterns by experience. Cycle 9. The gamma buzz: gluing by oscillations in the waking brain. Cycle 10. Perceptions and actions are brain state-dependent. Cycle 11. Oscillations in the "other cortex:" navigation in real and memory space. Cycle 12. Coupling of systems by oscillations. Cycle 13. The tough problem. References.

Rhythms of the brain

Schultz, Wolfram. Predictive reward signal of dopamine neurons. J. Neurophysiol. 80: 1–27, 1998. The effects of lesions, receptor blocking, electrical self-stimulation, and drugs of abuse suggest t...

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Predictive Reward Signal of Dopamine Neurons

Interneurons of the hippocampus

中枢神経系疾患の治療は正常細胞（ニューロン）の機能維持を目的とするが，脳血管障害のように機能障害の原因が細胞の死滅に基づくことは多い．一方，脳腫瘍の治療においては薬物療法や放射線療法といった腫瘍細胞の死滅を目標とするものが大きな位置を占める．いずれの場合にも，細胞死の機序を理解することは各種病態や治療法の理解のうえで重要である．現在のところ最も研究の進んでいる細胞死の型はアポトーシスである．そのなかで重要な位置を占めるミトコンドリアにおける反応および抗アポトーシス因子について概要を紹介する．

Neuroscience 細胞死：最近の知見

The basal ganglia are a highly interconnected network of nuclei essential for the modulation and execution of voluntary behavior The neostriatum is the principal input and one of the principal controllers of the output of the basal ganglia Neostriatal projection neurons seem to be dynamically and powerfully controlled by GABAergic inputs, but the source(s) and physiological properties of these inputs remain unclear Here we use paired whole-cell recordings to show that this inhibition derives from small populations of GABAergic interneurons that are themselves interconnected through functional electrotonic synapses Inhibitory synaptic potentials generated from single interneurons are sufficiently powerful to delay or entirely block the generation of action potentials in a large number of projection neurons simultaneously

Inhibitory control of neostriatal projection neurons by GABAergic interneurons.

Functional diversity and specificity of neostriatal interneurons.

https://www.cell.com/trends/neurosciences/pdf/S0166-2236(04)00273-5.pdf

GABAergic microcircuits in the neostriatum

The canonical view of striatal GABAergic interneurons has evolved over several decades of neuroanatomical/neurochemical and electrophysiological studies. From the anatomical studies, 3 distinct GABAergic interneuronal subtypes are generally recognized. The best-studied subtype expresses the calcium-binding protein, parvalbumin. The second best known interneuron type expresses a number of neuropeptides and enzymes, including neuropeptide Y, somatostatin and nitric oxide synthase. The last GABAergic interneuron subtype expresses the calcium binding protein, calretinin. There is no overlap or co-localization of these three different sets of markers. The parvalbumin-immunoreactive GABAergic interneurons have been recorded in vitro and shown to exhibit a fast-spiking phenotype characterized by short duration action potentials with large and rapid spike AHPs. They often fire in a stuttering pattern of high frequency firing interrupted by periods of silence. They are capable of sustained firing rates of over 200 Hz. The NPY/SOM/NOS interneurons have been identified as PLTS cells, exhibiting very high input resistances, low threshold spike and prolonged plateau potentials in response to intracellular depolarization or excitatory synaptic stimulation. Thus far, no recordings from identified CR interneurons have been obtained. Recent advances in technological approaches, most notably the generation of several BAC transgenic mouse strains which express a fluorescent marker, enhanced green fluorescent protein, specifically and selectively only in neurons of a certain genetic makeup (e.g., parvalbumin-, neuropeptide Y-, or tyrosine hydroxylase-expressing neurons etc.) have led to the ability of electrophysiologists to visualize and patch specific neuron types in brain slices with epifluorescence illumination. This has led to a rapid expansion of the number of neurochemically and/or electrophysiologically identified interneuronal cell types in the striatum and elsewhere....

/pdf/heterogeneity-and-diversity-of-striatal-gabaergic-11mwppq8w2.pdf

Heterogeneity and diversity of striatal GABAergic interneurons.

Evidence from electrophysiological studies has suggested an inhibitory interaction between GABAergic neurons in substantia nigra pars reticulata and dopaminergic neurons in pars compacta. However, that this inhibitory interaction is due to a projection from pars reticulata to pars compacta has never been demonstrated directly, nor has the GABAergic neuron that mediates the interaction been identified either electrophysiologically or anatomically. To more closely examine interactions between substantia nigra pars reticulata GABA neurons and dopaminergic neurons, single unit extracellular recordings were obtained from antidromically identified nigrostriatal neurons and their response to antidromic activation of nigral GABAergic projection neurons observed. Stimulation of superior colliculus or thalamus produced a short latency inhibition of dopaminergic neurons. This inhibition was blocked by local application of bicuculline but not 2-hydroxysaclofen. Bicuculline caused most dopaminergic neurons to fire in a bursty mode, whereas saclofen caused most dopaminergic neurons to fire in a pacemaker-like mode. The thalamicevoked inhibition was not affected by kainate lesions of the globus pallidus, but these lesions produced effects on firing pattern identical to those produced by saclofen. These data demonstrate a short latency inhibition of nigral dopaminergic neurons mediated by GABA, receptors that arises from the axon collaterals of pars reticulata projection neurons. We propose a model in which the firing pattern of nigral dopaminergic neurons in viva is modulated differentially by disinhibition of GABA, inputs arising from pars reticulata projection neuron axon collaterals and disinhibition of pallidonigral GABAergic inputs mediated by GABA, receptors.

https://www.jneurosci.org/content/jneuro/15/4/3092.full.pdf

James M. Tepper

Papers

Inhibitory control of neostriatal projection neurons by GABAergic interneurons.

Functional diversity and specificity of neostriatal interneurons.

GABAergic microcircuits in the neostriatum

Heterogeneity and diversity of striatal GABAergic interneurons.

GABAA receptor-mediated inhibition of rat substantia nigra dopaminergic neurons by pars reticulata projection neurons