In vitro release of colchicine using poly(phosphazenes): the development of delivery systems for musculoskeletal use.

Abstract:

:A colchicine release system utilizing biodegradable poly(phosphazenes) was investigated in vitro for intra-articular administration. Polymer degradation and drug release studies were performed on colchicine-loaded poly(phosphazenes) containing either imidazolyl (I-PPHOS) or ethyl glycinato (EG-PPHOS) side chain substituents over a 21-day period. To study the effects of an implantable colchicine-PPHOS delivery system on local musculoskeletal tissue in vitro, osteoblast-like cells were grown on the matrices. Colchicine release was 20% for I-PPHOS and 60% for EG-PPHOS over the 21-day period. Release appeared to proceed through a combination of diffusional and degradative mechanisms. Environmental scanning electron microscopy (ESEM) studies revealed large pores in the drug-depleted devices in contrast to the control matrices without drug, which may have contributed to the release seen, especially with ethyl glycinato-containing matrices. Cell growth on matrices containing colchicine was significantly (p < 0.05) inhibited in contrast to growth on tissue culture polystyrene (TCPS) and EG-PPHOS matrices without drug. The in vitro cell kinetic data suggest that designs for in vivo studies must take into account possible toxicity of colchicine and the polymer matrix on local tissue. Biodegradable PPHOS systems are promising candidates for use as intra-articular delivery vehicles for drugs with potential for systemic toxicity.

journal_name

Pharm Dev Technol

authors

Ibim SM,el-Amin SF,Goad ME,Ambrosio AM,Allcock HR,Laurencin CT

doi

10.3109/10837459809028479

subject

Has Abstract

pub_date

1998-02-01 00:00:00

pages

55-62

issue

1

eissn

1083-7450

issn

1097-9867

journal_volume

3

pub_type

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