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Analysis of inflammatory processes in diffuse thickening of human aorta intima

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Abstract

It is generally recognized that accumulation of lipids and immune inflammatory cells is an early sign of atherosclerosis. In the present study, we investigated the relationship between the deposition of lipids, immune inflammatory cell content and expression of HLA-DR molecules, and class II major histocompatibility complex (MHC) (a marker of immune activation) in diffuse intima thickening (DIT). Lipids, including triglycerides, cholesterol esters, free cholesterol, and phospholipids were studied by chromatography and Oil Red O histochemistry, as well as by electron microscopy. Immune inflammatory cells and the expression of HLA-DR were investigated by immunohistochemistry in serial sections of the same tissue samples. It has been shown that the lipids were unevenly distributed in DIT. In the juxtaluminal sublayer, lipids were detected in the cytoplasm of intima cells and the extracellular area. In the juxtamedial musculoelastic sublayer of the intima, lipids were present predominantly along elastic fibers. The positive correlation between the presence of lipids and the expression of HLA-DR was revealed (r = 0.79; p < 0.001). A positive correlation was also found between the deposition of lipids and the number of immune inflammatory cells, although correlation was different for different sublayers of the intima. In particular, the correlation between the deposition of lipids and immune inflammatory cells in the juxtaluminal sublayer of the intima was higher (r = 0.69; p < 0.001) than in the juxtamedial musculoelastic layer (r = 0.28; p < 0.001). These data support the hypothesis that the accumulation of lipids in the intima is a key factor in the initiation of inflammatory reactions. At the preatherosclerotic stage of development of this disease, earlier pathological processes associated with lipid-dependent activation of immune cells occur mainly in the juxtaluminal portion of the intima.

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Abbreviations

DIT:

diffuse intima thickening

HLA-DR:

class II major histocompatibility complex molecules (human leucocyte antigen)

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Authors and Affiliations

  1. Institute for Atherosclerosis Research, Moscow, Russia

    Y. V. Bobryshev, V. P. Karagodin, M. M. Moisenovich, A. A. Melnichenko & A. N. Orekhov

  2. Institute of General Pathology and Pathophysiology, Moscow, Russia

    Y. V. Bobryshev & A. N. Orekhov

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  1. Y. V. Bobryshev
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  2. V. P. Karagodin
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  3. M. M. Moisenovich
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  4. A. A. Melnichenko
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  5. A. N. Orekhov
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Correspondence to V. P. Karagodin.

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Original Russian Text © Y.V. Bobryshev, V.P. Karagodin, M.M. Moisenovich, A.A. Melnichenko, A.N. Orekhov, 2013, published in Tsitologiya, 2013, Vol. 55, No. 6, pp. 394–405.

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Bobryshev, Y.V., Karagodin, V.P., Moisenovich, M.M. et al. Analysis of inflammatory processes in diffuse thickening of human aorta intima. Cell Tiss. Biol. 7, 439–449 (2013). https://doi.org/10.1134/S1990519X13050039

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