[The differentiation of locus coeruleus neurons after their allotransplantation into the preliminarily denervated hippocampus of white rats]. / Differentsirovka neironov golubovatogo mesta posle ikh allotransplantatsii v predvaritel'no denervirovannyi gippokamp belykh krys.

The suspension of embryonic locus coeruleus (LC) was transplanted into outbred albino rat hippocampus after its preliminary 6-hydroxy-dopamine-induced denervation. Immunohistochemical and morphometric analysis revealed that 3 months after the transplantation, embryonic noradrenergic LC cells which have completed their histogenesis in recipient hippocampus, appear as differentiated multipolar and fusiform cells, typical to LC. Intrahippocampal allotransplants of rat embryonic LC were also demonstrated to normalize the level of orientation activity in an open area, that was significantly reduced after administration of 6-hydroxy-dopamine to the animals.

[Effect of artificial polarization of the membrane on IPSP of neurons in the cat sensorimotor cortex]. / Vliianie iskusstvennoi poliarizatsii membrany na TSPS neironov sensomotornoi kory koshki.

Inversion of the early component of IPSPs in neurons of the sensorimotor cortex by artificial hyperpolarization of the membrane was demonstrated in cats immobilized by myorelaxants in acute experiments. The late component of IPSP was not inverted. Amplitudes of the early component of IPSPs were decreased by the membrane depolarization while the late component was completely reduced. The input resistance of the membrane which decreased during the early component of IPSPs was restored to the initial level during the late component.

[Participation of calcium-dependent potassium conductance in the processes of membrane hyperpolarization of the pyramidal neurons in the sensorimotor cortex in the cat]. / Uchastie kal'tsiizavisimoi kalievoi provodimosti v protsessakh giperpoliarizatsii membran piramidnykh neironov sensomotornoi kory koshki.

In acute experiments on immobilized cats intracellular injection of Ca+ decreased of IPSP and postburst hyperpolarization amplitudes in pyramidal neurons of the sensorimotor cortex. Intracellular injection of ethylene glycol tetraacetic acid had almost the same effect. This substance also reduced the late part of spike afterhyperpolarization, while the early part remained practically unchanged. It is concluded that Ca2+-dependent K+-conductance might play an important role in the genesis of IPSP, postburst and spike afterhyperpolarization in the membrane of pyramidal neurons of the cat sensorimotor cortex.

[Effect of intracellular injections of chloride ion on the inhibitory postsynaptic potential and post-burst hyperpolarization of sensomotor cortex neurons in the cat]. / Vliianie vnutrikletochnoi in"ektsii ionov khlora na tormoziashchii postsinapticheskii potentsial i postzalpovuiu giperpoliarizatsiiu neironov sensomotornoi kory koshki.

Inversion of the early component of IPSPs in pyramidal neurons of the sensorimotor cortex by intracellular injection of chloride ions was demonstrated in cats immobilized by myorelaxants in acute experiments under moderate composed anesthesia (40 mg/kg nembutal and 20 mg/kg chloralose intraperitoneally). The late component of IPSPs as well as the post-burst hyperpolarization in pyramidal neurons were not inverted. It is concluded that during the early component of IPSPs of both pyramidal and nonpyramidal neurons the membrane permeability is increased for chloride ions, while both the late component of IPSPs and the post-burst hyperpolarization in pyramidal neurons are less dependent on the chloride permeability.