Participation of cAMP-Mediated Signaling Transduction in the Regulation of the Secretory Function of Neuroglia during Ethanol-Induced Neurodegeneration

We studied the involvement of cAMP and PKA in the regulation of the secretion of neurotrophic growth factors by macro-and microglial cells in the model of ethanol-induced neurodegeneration in vitro and in vivo. The stimulating role of cAMP in the secretion of neurotrophins by intact astrocytes and oligodendrocytes was shown, while PKA does not participate in this process. On the contrary, the inhibitory role of cAMP (implemented via PKA activation) in the production of neurogenesis stimulators by microglial cells under conditions of optimal vital activity was found. Under the influence of ethanol, the role of cAMP and PKA in the production of growth factors by macroglial cells was considerably changed. The involvement of PKA in the cAMP-dependent signaling pathways and inversion of the role of this signaling pathway in the implementation of the neurotrophic secretory function of astrocytes and oligodendrocytes, respectively, directly exposed to ethanol in vitro were noted. Long-term exposure of the nervous tissue to ethanol in vivo led to the loss of the stimulating role of cAMP/PKA signaling on neurotrophin secretion by macroglial cells without affecting its inhibitory role in the regulation of this function in microglial cells.

Psychopharmacological Effects of Stimulation of the Functions of Neural Stem Cells by STAT3 Inhibitor under Conditions of Modeled Ethanol-Induced Encephalopathy

The psychopharmacological effects of a stimulator of functions of progenitor cells of the nervous tissue STAT3 inhibitor (STAT3 Inhibitor XIV, LLL12) were studied under conditions of modeled alcoholic encephalopathy in C57BL/6 mice. The pharmacological agent corrected the parameters of exploratory behavior (characterizing predominantly cognitive activity) in the experimental animals at the late terms of observation. At the same time, the reproducibility of the conditioned passive avoidance response developed at the beginning of the course STAT3 inhibitor administration decreased. These effects developed against the background of a significant increase in the content of neural stem cells and their proliferative activity in the paraventricular zone of the brain.

[Comparative characteristic of cognitive impairment at alcoholic and discirculatory encephalopathy]

OBJECTIVE

Identification of features of cognitive impairment at patients with alcoholic and discirculatory encephalopathy.

MATERIAL AND METHODS

30 patients with the alcoholic encephalopathy (AE) and 32 - with discirculatory encephalopathy (DE) participated in research. To patients conducted clinical examination, a computer electroencephalography with determination of cognitive evoked potentials, neuropsychological testing.

RESULTS

General and distinguishing characters of a clinical picture, cognitive deficiency, disturbances in the emotional and personal sphere at patients with encephalopathies alcoholic and vascular genesis are established.

CONCLUSION

It is established that a basis of a clinical picture of encephalopathy of various genesis are the cognitive disturbances (CD) and an asthenic syndrome, of AE it is characteristic hyposthenic, and at DE - hyper - and hyposthenic syndromes. Changes of bioelectric activity of a brain at DE had primary localization in occipitoparietal departments of a brain, at AE - in temporal and occipitoparietal assignments. Disorder of categorial thinking, the long-term memory, reciprocal coordination, manual gnosis indicating dysfunction by a frontal, parietal lobe of the left hemisphere, a hippocampus, a corpus collosum are provided to CD in DE and AE patients. It is established that distinguishing characters of CD in AE and DE patients are values of indexes Δ-, β1-, β2-rhythms, the indicators characterizing the impressive speech, volume of visual figurative memory, level of severity of hypochondria.