Ukr.Biochem.J. 2014; Volume 86, Issue 2, Mar-Apr, pp. 79-88


Proteolytic activity of IgG-antibodies of mice, immunized by calf thymus histones

Yu. Kit1, N. Korniy1,3, I. Kril’2, I. Magorivska1, V. Tkachenko1, R. Bilyy1,2, R. Stoika1

1Institute of Cell Biology, National Academy of Sciences of Ukraine, Lviv;
2Danylo Galytsky Lviv National Medical University, Ukraine;
3Ivan Franko L’viv National University, Ukraine

The main goal of the study was to determine the ability of histones to induce production of the proteolytically active IgG-antibodies in BALB/c mice. In order to perform this study 8 mice were immunized with the fraction of total calf thymus histones. IgGs were isolated from the serum of the immunized and not immunized animals by means of precipitation with 33% ammonium sulfate, followed by affinity chromatography on protein G-Sepharose column. Histones, myelin basic protein (MBP), lysozyme, BSA, ovalbumin, macroglobulin, casein and cytochrome c served as substrates for determining the proteolytic activity. It was found that IgGs from the blood serum of immunized mice are capable of hydrolyzing histone H1, core histone and MBP. On the contrary, the proteolytic activity of IgGs from the blood serum of not immunized mice was not detected. The absence of proteolytical enzymes in the fraction of IgGs was proven by HPLC chromatography. High levels of proteolytic activity toward histones have been also detected in affinity purified IgGs from blood serum of patients with rheumatoid arthritis, but not in healthy donors. These data indicate that eukaryotic histones may induce production of protabzymes in mammals. The possible origin of these protabzymes and their potential biological role in mammalians is discussed.

Keywords: , , , , ,


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