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Xenobiotica
the fate of foreign compounds in biological systems
Volume 20, 1990 - Issue 12
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Original Article

Blood clearance and organ distribution and tissue concentration of native, homopolymerized and IgG-conjugated ribosome-inactivating proteins

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Pages 1331-1341 | Received 23 Oct 1989, Accepted 25 May 1990, Published online: 27 Aug 2009
 

Abstract

1. The blood clearance, organ distribution and tissue concentration of several native, homopolymerized, and IgG-conjugated 125I-labelled ribosome-inactivating proteins (RIPs) were determined in mice.

2. Native RIPs were cleared rapidly from blood, with half-lives of 4-8 min, and were concentrated mainly in the kidneys.

3. After conjugation to IgG the three RIPs studied showed increased blood half-lives and decreased concentrations in the kidneys.

4. The two homopolymers studied had blood half-lives and kidney concentrations intermediate to those of free and conjugated RIPs.

5. These results indicate that after IgG-conjugation the increased half-lives of the RIPs studied were at least in part due to the larger molecular size of the conjugates and to their lower renal excretion.

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