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Sustained delivery of human growth hormone from a novel gel system: SABERTM

Paper ID Volume ID Publish Year Pages File Format Full-Text
13716 894 2002 6 PDF Available
Title
Sustained delivery of human growth hormone from a novel gel system: SABERTM
Abstract

Purpose: The purpose of this study was to evaluate the release of recombinant human growth hormone (rhGH) from a novel non-polymeric sustained release system, SABER™.Methods: The SABER system consists of sucrose acetate isobutryate, a solvent and a polymeric release modifier. Spray dried formulations of zinc complexed rhGH in sodium bicarbonate containing sucrose and polysorbate 20 were homogenized with various SABER systems (10% w/v rhGH) and assessed in vitro and in vivo (rat studies). The effect of protein to sucrose ratio in the spray dried formulation and a release modifier, poly-d,l-lactic acid (PLA), in the SABER system, on the initial release was investigated along with the effect of dose volume.Results: The in vitro release studies with rhGH SABER suspensions indicate that increasing the sucrose content from 2 to 5 mg/ml in the rhGH formulations increased the initial release (24 h) from 78.0% to 93.5%. When the protein formulation was held constant and 1.0% w/w PLA was added to the solvent phase, the initial release was reduced from 78.0% to less than 5.0%. The initial release in vivo after subcutaneous administration (SC) in rats (15 mg/kg rhGH) decreased with increasing PLA content (1.0% w/w PLA, Cmax=342.8 ng/ml; 10% w/w PLA, Cmax=35.4 ng/ml), while increased sucrose content increased both the initial release (AUC0–2 days) and persistence (AUC2–7 days) over the 7 days from 64.2 to 228.4 ng day/ml (total AUC). A linear dose response (rhGH serum levels) was observed after SC administration of different rhGH SABER volumes greater than 100 μl. Histological examination of the injection sites indicated a mild inflammatory response similar to that observed after injection of PLA microspheres.Conclusions: The addition of PLA reduced the initial release rate of protein release from SABER, while increasing the sucrose content of the protein formulation yielded increased rhGH persistence. These results demonstrate that the SABER delivery system allows weight-based dosing at volumes greater than 100 μl to achieve sustained release of intact rhGH in vivo for at least 7 days.

Keywords
Drug delivery; SAIB; Sustained release; Biodegradable; Human growth hormone
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Sustained delivery of human growth hormone from a novel gel system: SABERTM
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biomaterials - Volume 23, Issue 22, November 2002, Pages 4353–4358
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us