Long-acting delivery systems for peptides: inhibition of rat prostate tumors by controlled release of [D-Trp6]luteinizing hormone-releasing hormone from injectable microcapsules.

Abstract Intramuscular injection of [6-D-tryptophan]-luteinizing hormone-releasing hormone [( D-Trp6]LH-RH) in microcapsules of poly(DL-lactide-co-glycolide), designed to release a controlled dose of the peptide over a 30-day period, decreased the weights of androgen-dependent Dunning prostate tumors in rats and suppressed serum testosterone levels more effectively than daily subcutaneous administration of equivalent or double doses of unencapsulated [D-Trp6]LH-RH. The microcapsules or daily injections of [D-Trp6]LH-RH also significantly decreased tumor volumes. Microcapsules of [D-Trp6]LH-RH or related analogs that can be injected once a month should make the treatment of patients with prostate carcinoma and other neoplasms or disorders more convenient and efficacious. Full text PDFImages in this article Selected References These references are in PubMed. This may not be the complete list of references from this article. - Ahmed S. R., Brooman P. J., Shalet S. 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