title: Release of liposomal contents by cell-secreted matrix metalloproteinase-9.
abstract: Liposomes have been widely used as a drug delivery vehicle, and currently, more than 10 liposomal formulations are approved by the Food and Drug Administration for clinical use. However, upon targeting, the release of the liposome-encapsulated contents is usually slow. We have recently demonstrated that contents from appropriately formulated liposomes can be rapidly released by the cancer-associated enzyme matrix metalloproteinase-9 (MMP-9). Herein, we report our detailed studies to optimize the liposomal formulations. By properly selecting the lipopeptide, the major lipid component, and their relative amounts, we demonstrate that the contents are rapidly released in the presence of cancer-associated levels of recombinant human MMP-9. We observed that the degree of lipid mismatch between the lipopepides and the major lipid component profoundly affects the release profiles from the liposomes. By utilizing the optimized liposomal formulations, we also demonstrate that cancer cells (HT-29) which secrete low levels of MMP-9 failed to release a significant amount of the liposomal contents. Metastatic cancer cells (MCF7) secreting high levels of the enzyme rapidly release the encapsulated contents from the liposomes.
authors: Department of Pharmaceutical Sciences, Department of Chemistry, Biochemistry and Molecular Biology, North Dakota State University, Fargo, North Dakota 58108, USA.
authors: Jayati
authors: J
authors: Banerjee
authors: Andrea J
authors: AJ
authors: Hanson
authors: Bhushan
authors: B
authors: Gadam
authors: Adekunle I
authors: AI
authors: Elegbede
authors: Shakila
authors: S
authors: Tobwala
authors: Bratati
authors: B
authors: Ganguly
authors: Anil V
authors: AV
authors: Wagh
authors: Wallace W
authors: WW
authors: Muhonen
authors: Benedict
authors: B
authors: Law
authors: John B
authors: JB
authors: Shabb
authors: D K
authors: DK
authors: Srivastava
authors: Sanku
authors: S
authors: Mallik
mesh_terms: D000230:Adenocarcinoma / Q000201:enzymology; D001943:Breast Neoplasms / Q000201:enzymology; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000201:enzymology; D005260:Female; D005452:Fluoresceins / Q000032:analysis; D006801:Humans; D055666:Lipopeptides / Q000138:chemical synthesis / Q000737:chemistry; D008081:Liposomes / Q000737:chemistry* / Q000378:metabolism*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism*
chemical_list: D005452:Fluoresceins; D055666:Lipopeptides; D008081:Liposomes; C024098:6-carboxyfluorescein; D020780:Matrix Metalloproteinase 9