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Tubo gastro-enterico<br />

Sangue<br />

Clearance Polmonare<br />

Azione Macrofagica<br />

NiO<br />

Ni3S2<br />

Ni 2+<br />

NiSO4<br />

Ni-Proteine Trasporto Ionico<br />

(Mg<br />

Sangue<br />

2+ ?)<br />

Urina<br />

Fagocitosi<br />

Citoplasma<br />

Ni-Proteine<br />

Ni 2+<br />

Ni 2+<br />

Ni-Proteine<br />

Membrana Cellulare<br />

Ni 3+<br />

Ni 2+<br />

Figura 4. Meccanismi di tossicità di Ni (adattato da Oller, 2002).<br />

Nucleo<br />

Gene espresso⇒Gene silente<br />

Metilazione DNA<br />

Stress ossidativo e danno DNA<br />

103

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