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ISSN 2410-7751 (Print)
ISSN 2410-776X (Online)

cover biotech acta general

Biotechnologia Acta Т. 16, No. 5 , 2023
P. 5-16, Bibliography 47, Engl.
UDC:: 577.112.5: 57.088
DOI: https://doi.org/10.15407/biotech16.06.005

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BIOMEDICAL APPLICATION OF K5 PLASMINOGEN FRAGMENT

L.G. Kapustianenko, A.O. Tykhomyrov

Palladin Institute of Biochemistry of the National Academy of Sciences of Ukraine, Kyiv

Aim. Plasminogen kringle 5 is an endogenous angiogenic inhibitor. The  review was purposed to highlight the potential biomedical application of Kringle 5 in the regulation of angiogenesis and tumor growth.

Methods. Angiogenesis is a complex process that involves endothelial cell proliferation, migration, basement membrane degradation, and neovessel organization. Since the uncontrolled growth of new blood vessels causes the progression of many common diseases, first of all, oncological diseases, autoimmune disorders, and neovascular damage of the eye, the use of angiostatins can be a promising pharmacotherapeutic approach to the prevention and adjuvant therapy of these pathological conditions. The advantages of angiostatin application are their non-toxicity even at high doses, non-immunogenicity, and lack of tolerance of target cells to their action. Angiostatins comprise a group of kringle-containing proteolytically-derived fragments of plasminogen/plasmin, which act as potent inhibitory mediators of endothelial proliferation and migration. Among all known angiostatin species, isolated K5 plasminogen fragment was shown to display the most potent inhibitory activity against proliferation of endothelial cells via triggering multiple signaling pathways, which lead to cell death and resulting angiogenesis suppression.

Results. Current literature data suggest that in addition to the expressed and highly specific cytotoxicity in relation to endotheliocytes and some types of tumor cells, the kringle domain 5 of human plasminogen has other advantages as an antiangiogenic and antitumor regulator, including its specific inhibitory activity, which affects only activated, proliferating endothelial cells, and therefore is non-toxic to different types of normal cells. As an endogenous protein, which is formed in the human organism, K5 does not provoke an immune response. K5, as a small polypeptide molecule with a stable structure, can be obtained as a recombinant protein in E. coli cells and can also be used in pharmacokinetic systems of targeted delivery and sustained release.

Conclusions. The prospect of successful use of K5 as a therapeutic agent to manage pathological processes associated with dysregulation of angiogenesis makes it necessary to develop and improve methods of its production and to test its plausible pleiotropic biological activities further.

Key words: angiostatins, plasminogen fragment kringle 5, angiogenesis, endothelial cells, neovascular diseases, tumor growth, retinopathy.

© Palladin Institute of Biochemistry of National Academy of Sciences of Ukraine, 2023