User:Alex Kuzin

A.V. Kuzin, Iu.G. Vasiliev, V.M. Tchuchkov, T.G. Shorokhova

ENSEMBLE CO-INTERACTIONS IN THE CENTRAL NERVOUS SYSTEM

Izhevsk - Berlin 2004

UDK 611.81.013 + 611.899.013]:612.824 BBK 28.866 К 89

Edited by Doctor of medical sciences, corresponding member of the Russian Academy of Medical Sciences, Professor L.L.Kolesnikov

Reviewers: Yorg Schultz – Professor, Doctor of Medicine, Medical Head of Helios Clinic, Head of the scientific Counsel of the European Academy of interdisciplinary medicine, Honorary president of the European union of Active anti-ageing; V.N.Nikolenko – Professor, Doctor of medical sciences, Head of the department of the human anatomy of Saratov State Medical University.

Recommended for edition by the consultative training counsel in anatomy and histology of the Ministry of Health of Russian Federation and by the Institute of Molecular and Systemic Medicine (Berlin)

A.V.Kuzin, Iu.G.Vasiliev, V.M.Chuchkov, T.G.Shorokhova. Ensemble co-interactions in the central nervous system: Monograph. Izhevsk – Berlin: ANK – 2004. – 160 pp.

ISBN 5–9631–0005–4 The monograph contains the information concerning the structure and function of the neuroglio-vascular ensembles, based on the authors’ investigations, as well as the available published results. While the early and sparse complex investigations of the analogical structures consider the presence of the macroglia as a factor allowing to isolate the functional neuron groups, much attention is given to the function of such ensembles at the level of individual microvascular pools around the bodies of the nervous cells, single or joined into the small groups; new data concerning the structure of the neuro-glio-vascular co-interactions, their formation during the ontogenetic development are represented. The problems of substances’ diffusion modeling in the central nervous system are discussed. The analysis of the correspondence of data, recorded by means of the computer modeling, with the results of morphometric investigations, is represented. The monograph may be of some interest for the neurobiologists, angiologists, physiologists and pathophysiologists.

УДК611.81.013 + 611.899.013]:612.824 ББК 28.866

© Collective of authors, 2004 © ANK Edition, 2004

CONTENTS

LIST OF THE ABBREVIATIONS	4 INTRODUCTION	5 Chapter I. MATERIALS FOR THE MORPHOLOGICAL EXAMINATION AND THE PARTICULAR FEATURES OF THEIR HISTOLOGICAL AND MORPHOMETRIC PROCESSING	7 I.1. Results of the authors’ investigations. Particularities of the sampling and histological processing of the material	7 I.2. Characteristics of the morphometric analysis used	8 CHAPTER II. STRUCTURE OF THE NEUROGLIO-VASCULAR COMPLEXES	12 II.1. Structure of the neurons in the nucleus pontis and in the nuclei of the mesencephalon	12 II.2. Structure and function of neuroglia in the central nervous system	20 II.3. Relationship between the angioarchitectonic and structural-functional organization of the nuclear centers. Ensemble organization of the nuclear centers	29 CHAPTER III. FORMATION OF THE NEUROGLIO-VASCULAR COMPLEXES DURING THE ONTOGENESIS	100 CHAPTER IV. BRAIN TRANSFER OF THE SUBSTANCES	122 CHAPTER V. MATHEMATICAL MODELLING OF THE TRANSPORTATION FLOW IN THE CENTRAL NERVOUS SYSTEM	124 V.1. Mathematical analysis of the diffusion flows of the oxygen and carbon dioxide	124 V.2. Results obtained during the analysis of the oxygen diffusion flows using the mathematical model	127 V. 3. Carbon dioxide diffusion flows, obtained using the mathematical modeling 	131 V. 4. Modeling of the glucose transportation flow in the nervous system	132 V. 5. Results obtained using the analysis of the mathematical model of the glucose transportation 	136 V.6. Oxygen distribution modeling in the aniage of the posterior cerebral vesicle	141 CONCLUSION	144 REFERENCES	147

INTRODUCTION

The investigators of the nervous system have recently faced a challenge in the interpretation of the results obtained in studies of the structure and activity of the nervous system. The abundant information concerning cerebral ultrastructural architecture does not allow the authors to make a comprehensive clarification of the brain activities as an integral system (N.S. Kositsin, 1978; A.S. Batuyev, .P. Babmindra, 1993; I.G. Akmayev, 1996; K.K. Sudakov, 1996). The data concerning the neurophysiological processes in the brain are often significantly abstracted of the investigation of morphologic substrate where these processes take place (O.S. Adrianov, 1995; N.N. Bogolepov, 1996). The growing specialization of actual neurological disciplines, one-dimensional interest to a certain line of investigations determines the difficulties in the investigation of brain as a whole. The formation of the complex apprehension of the cerebral processes appears essential. Histology and microanatomy per se, being the descriptive disciplines, are often considered by the authors to be out of date, in many instances having the depleted capabilities (the position that we absolutely disagree with). This is related to the impossibility of investigation of the physiological processes which take place in the examined morphological structure. Until now the above mentioned sciences use insufficiently the methods of mathematical modeling of the biological processes. These methods are limited either by the derivation of the generalizing formulas based upon the average values, or by the determination of the most expressed correlations. Sometimes the researches are concerned with the entropy indicators, which are fairly promising. Nevertheless the high degree of formalization does not allow specifying the concrete processes taking place in the diverse existence conditions of the individual cellular and tissue body structures and those of the nervous system particularly. The number of interesting phenomena existing in the real object, are lost, which results in the impossibility of the mathematical modeling of biological processes as the near-real scientific cognition approach.

The proposed perspective of a more precise examination of the changes in the organism, particularly in the brain, consists in the synthesis or combination of the opportunities of morphology, of mathematics and of physiology. This monograph does not pretend to compose the global system, but here we attempt to propose the new approach to the solution of the problem of complex evaluation of co-interacting structures in the organism, and in the central nervous system particularly. One of directions of the recent neuromorphology and neurophysiology consists in the investigation of the structural-functional correlations between the neuronal status and the system of glial-trophic environment. The parameters are not developed which could allow performing an objective follow-up of the intensity of blood supply not only in the entire anatomical structure (nerve centers), but in the individual neurons as well. The neural cells can differ by their sizes, structure, mediators and structural rearrangements under the pathologic influences. In case of omission of certain parameters the contradictory estimations of microcirculation state within different periods of ontogenetic development can occur. The blood supply parameters of the nervous centers provided they are nominally considered as isomorphous structures having the similar conditions of local blood circulation, do not allow establishing particular changes in the furnishment of separate components and cannot take into account the relationship between the neuropil and the neuronal perikaryon. The significance of this investigation is also determined by the focal nature of microcirculatory reactions in case of various vascular diseases, when the growth of the microvessels is associated with the phenomena of their obliteration in the adjacent sections (N.V. Vereshchagin, 1999).

Thus far, the value of the large group of biologically active substances is clarified, secreted not only by neurons, but also by neurogliocytes and by the endotheliocytes, that are known to exert the significant stabilizing influence on the functional activity and metabolic processes in the nerve tissue (I.N. Bogolepova et al., 1995; P Hamilton Steven, 1994; T.J. Sims, S.A. Gilmore, 1994; A. Rizvi Tilar, Ennis Methhav et al, 1994; Nakaya Yoshifumi, Kaneko Takashi et al, 1994; J Gehrmann, D.L. Yao, 1995; M.C. Jasek, W.H. Griffith, 1998; T Ebendal, S Soderstrom et al, 1998). The importance of macroglia was demonstrated in the mechanisms of the so-called volume signal transfer, of the impulse conversion, of accommodation and synchronization of the neuron ensembles, implicated into the adaptive reactions (M.O. Samoilov, A.A. Mokrushin, 1999, B. Ranson, 1992; E.N. Benveniste, 1995; K.E. Bovenkamp, P.A. Lapchac, et al, 1997; J.M. Conner, S Varon, M.S. Hoener 1998). At the same time, in the scientific publications the primary attention is given to the structure of neuron ensembles (E.B. Arushanyan, 1979; T.I. Belova, E.L. Golubeva et al., 1980; S.N. Olenev, 1987; V.P.Babmindra, T.A. Bragina et al., 1988; B Dalva Metthew, Grosh Anirvan, J Sharz Curla, 1994; K Seto, K Kamino et al, 1998; N.N. Bogolepov, V.M. Chuchkov, 2003). The other research trends concern the vessels (T.V. Ryasina, 1977; A.D. Bekov, E.G. Aronov et al., 1996), or the glial cells (Caviness Yerne S, Nission JenaPaul, 1991; A. Stendler Dennis, 1993; E. Nexdorf, Bergveiler Barbara, Albrecht Dorotea, Heinemann Uwe, 1994). The comprehensive studies of neuron, glial and vascular structures have the sporadic nature (A.M. Antonov, 1985; V.M. Chuchkov, 1991; L.K. Semenova, N.S.Shumeyko, 1994; O.Iu. Gurina, Iu.G.Vasil'yev, 1995; Iu.G.Vasil'yev, 1995, 1998; V.M. Chuchkov, 2004).

The difficulty of discovering of all the components of the nervous system is explained by the morphological heterogeneity and complexity of the micro-architectonics of neurons and neuroglia. The optico-electronic analysis, with all its sophistication and accuracy, cannot result in a comprehensive picture of the three-dimensional variability of these interrelations, since it is allows only studying them merely in the small-volume zones, revealing the nature of neuro-glio-vascular co-interactions at limited sites, while the entire range of such connections is lost.

In this context, the purpose of this monograph consisted in the attempt of summarization of our own study results and of other authors opinions and in the analysis of special features of neuro-glio-vascular interrelations in some zones of mammalian central nervous system, along with the development of quantitative and qualitative methods of their assessment. In the course of this work we developed the mathematical analysis approach to the assessment of the trophic supply at the level of microvascular capillary basins, allowing performing the detailed analysis of blood supply at the level of individual populations of the neuronal perikarya and microvascular basins.