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Pharmacokinetics and Tissue Distribution of Recombinant Human Transforming Growth Factor Beta1 After Topical and Intravenous Administration in Male Rats

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Abstract

Recombinant human transforming growth factor beta (rhTGF-β1) enhances the healing process after topical application to various animal wound models. A detailed pharmacokinetic and tissue distribution study was performed to support the clinical development of rhTGF-β1 for wound healing indications. Rats received radioiodinated or unlabeled rhTGF-β1 as an intravenous (iv) bolus or as a topical formulation applied to a full thickness wound. Plasma concentrations of TGF-β1 were estimated from TCA-precipitable radioactivity or were measured by ELISA. Following iv administration, the initial half-life was rapid (<11 min), regardless of whether radi-olabeled or unlabeled rhTGF-β1 was used. The terminal half-life was long (163 min) when the test material was radioiodinated and administered as a trace dose and relatively short (≤61 min) when given at high doses and assayed by ELISA. Analysis of plasma radioactivity by SDS-PAGE revealed a time-dependent clearance of the 25-kDa parent molecule without a significant appearance of lower molecular weight radiolabeled metabolites. The majority of the radioactivity was associated with highly perfused organs, known iodide elimination pathways, and the thyroid at 1 and 8 hr after iv injection. After topical administration of a high dose (0.8 mg/kg), no immunoreactive TGF-β1 was detectable in plasma samples taken over a 48-hr period. However, trace amounts (≤0.05 ng/mL) of acid-precipitable radioactivity were detected in plasma after topical application of [125I]rhTGF-β1 (1 µg/kg, 126 µCi/kg). A significant portion (35%) of the [125I]rhTGF-β1 persisted intact (25 kDa) at the wound site 24 hr after application. In conclusion, rhTGF-β1 was rapidly cleared after iv bolus administration and distributed primarily to the liver, lungs, kidney, and spleen. Little systemic exposure was observed after applying a single topical dose of rhTGF-β1 to a wound, and the intact molecule persisted at the wound site.

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Authors and Affiliations

  1. Department of Safety Evaluation, Genentech, Inc., South San Francisco, California, 94080-4990

    Thomas F. Zioncheck, Sharon A. Chen, Louise Richardson, Derf Lewis, James D. Green & Joyce Mordenti

  2. Department of Medicinal and Analytical Chemistry, Genentech, Inc., South San Francisco, California, 94080-4990

    Marina Mora-Worms & Catherine Lucas

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  1. Thomas F. Zioncheck
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  2. Sharon A. Chen
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  8. Joyce Mordenti
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Zioncheck, T.F., Chen, S.A., Richardson, L. et al. Pharmacokinetics and Tissue Distribution of Recombinant Human Transforming Growth Factor Beta1 After Topical and Intravenous Administration in Male Rats. Pharm Res 11, 213–220 (1994). https://doi.org/10.1023/A:1018995005775

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