PMID: 16523653Mar 10, 2006Paper

Role of proteins of the macroglobulin family in regulation of tumor growth

Ontogenez
N A ZorinR M Zorina

Abstract

Proteins of the macroglobulin family are an ancient and evolutionarily conservative link of the immune system, which is actively involved in both inhibition of tumor growth cells and proliferation of tumor cells. Two basically different binding sites and a great conformational plasticity of all representatives of the macroglobulin family, as well as the presence of two to four representatives of the family in the blood of most species allow them to transport diverse substances and exert various regulatory influences on both the tumor and the entire organism. For example, the capacity of macroglobulins for binding hydrolases makes it possible to inhibit enzyme mediated tumor invasion. At the same time, an excess of macroglobulin/hydrolase complexes can activate apoptosis. The tumor is able of using macroglobulins, especially pregnancy-associated proteins, for its own protection. Specifically, pregnancy-associated alpha2-glycoprotein, which is actively produced by human tumor cells, blocks the histocompatibility complex antigens. On the contrary, the capacity of binding zinc stimulates the thymulin-dependent activation of natural killer cells. Nevertheless, the actively growing tumor expresses many receptors to macroglobulins, wh...Continue Reading

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Citations

Oct 1, 2008·Indian Journal of Clinical Biochemistry : IJCB·Maya RocheK Nalini
Sep 26, 2009·Neuroscience and Behavioral Physiology·T V Chernigovskaya

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