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Variability of biological effects of silicas: Different degrees of activation of the fifth component of complement by amorphous silicas

Governa, Mario, Amati, Monica, Fenoglio, Ivana, Valentino, Matteo, Coloccini, Sabrina, Bolognini, Lucia, Carlo Botta, Gian, Emanuelli, Monica, Pierella, Francesca, Volpe, Anna Rita, Astolfi, Paola, Carmignani, Marco, Fubini, Bice·2005·Toxicology and Applied Pharmacology
DOI 10.1016/j.taap.2005.01.019
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Abstract

A biogenic and a pyrogenic amorphous silica were incubated in normal human plasma and compared on a per unit surface basis for their ability to split C5 molecules and yield small C5a peptides. Since C5a peptides induce selective chemotactic attraction of polymorphonuclear leukocytes (PMN), measurement of PMN-induced chemotaxis was used as an index of C5 activation. Though to a lesser extent than the crystalline forms, amorphous silicas can promote the cleavage of C5 protein and generation of C5a-like fragment. The biogenic silica, which differs from the pyrogenic variety in particle shape, level of contaminants, and degree of surface hydrophilicity, besides specific surface, induced a greater response. Both silicas activated C5 through a process which seems to involve multiple events similar to those induced by crystalline silica. C5 molecules are adsorbed and hydroxyl radicals are generated through Haber Weiss cycles catalyzed by the redox-active iron present at the particle surface either as trace impurities or chelated from plasma by silanol groups. In turn, these radicals convert native C5 to an oxidized C5-like form C5(H2O2). Finally, C5(H2O2) is cleaved by protease enzymatic action of plasma kallikrein activated by the same silica dusts, yielding a product, C5a(H2O2), having the same functional characteristic as C5a.

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Metadata

Authors
Governa, M., Amati, M., Fenoglio, I., Valentino, M., Coloccini, S., Bolognini, L., Carlo Botta, G., Emanuelli, M., Pierella, F., Volpe, A. R., Astolfi, P., Carmignani, M., & Fubini, B.
Venue
Toxicology and Applied Pharmacology
Publisher
Elsevier BV
Published
2005-10
Volume
208
Issue
1
Pages
68-77
ISSN
0041-008X
DOI
10.1016/j.taap.2005.01.019
Cited by
16
References
3
Language
en
Licence
www.elsevier.com/tdm/userlicense/1.0/ (tdm)

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