Involvement of proinflammatory S100A9/A8 in the atherocalcinosis of aortic valves

Authors

  • R. А. Moskalenko Sumy State University, Ukraine,
  • А. M. Romaniuk Sumy State University, Ukraine Umeå University, Sweden,
  • I. O. Iashchishyn Sumy State University, Ukraine Umeå University, Sweden,
  • I.-M. S. Zakorko Sumy State University, Ukraine,
  • А. M. Piddubnyi Sumy State University, Ukraine,
  • Ye. O. Chernov Umeå University, Sweden,
  • L. O. Morozova-Roche Umeå University, Sweden,

DOI:

https://doi.org/10.14739/2310-1237.2017.1.98183

Keywords:

aortic valves, calgranulin A, calgranulin B

Abstract

According to the results of the Euro-Heart Survey on Vascular Heart Disease the most common pathology is nonrheumatic aortic stenosis, it is also called as calcific aortic valve stenosis (CAVS), as in its pathogenesis the process of biomineralization of valve cusps and ring plays the main role.

The aim of the work is the immunohistochemical study of mineralized tissue of aortic heart valves, which are affected by atherocalcinosis.

Materials and methods. 30 samples of mineralized aortic valves (I group) and 10 samples of aortic valve without evidence of biomineralization (II group  -– control) were studied. Immunohistochemical study of expression of collagen (Collagen I), CD68, myeloperoxidase (MPO), calgranulin A (S100A8), calgranulin B (S100A9), caspase 3 (Casp 3) and osteopontin (OPN) was conducted in AV tissue of both groups.

Results. In CAV tissues the fibrillar component (collagen I) growths was found, but the quantitative and qualitative compositions of CD68+ circulating inflammatory cells are not significantly different from the control group. CAVs contain much more MPO+ -cells (p <0.001) in comparison to the group of AVs without biomineralization.

Our data show a significant increase of the S100A9 and OPN expression in the mineralized tissue of AVs (p < 0.01). Also, a higher expression level of Casp3 and MPO was found in CAVs (p < 0.05). Comparing the first and the second groups of AVs connection between the expression of S100A8 was not determined.

Conclusion. High Casp 3 expression confirms the increased level of cell elimination in the CAVs tissue, which is obviously connected with the impact of high local concentrations of S100A9. These facts can contribute to the development of pathological biomineralization of AV. Since osteopontin inhibits the hydroxyapatite formation by binding to the surface of the crystals, its hyperproduction is a counteracting factor against biomineralization in AV tissue.

References

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1.
Moskalenko RА, Romaniuk АM, Iashchishyn IO, Zakorko I-MS, Piddubnyi АM, Chernov YO, Morozova-Roche LO. Involvement of proinflammatory S100A9/A8 in the atherocalcinosis of aortic valves. Pathologia [Internet]. 2017Apr.7 [cited 2024Apr.25];(1). Available from: http://pat.zsmu.edu.ua/article/view/98183

Issue

No. 1 (2017)

Section

Original research

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