title: Characterization of porous PLGA/PLA microparticles as a scaffold for three dimensional growth of breast cancer cells.
abstract: We have designed and evaluated biodegradable porous polymeric microparticles as a scaffold for cell growth. The hypothesis was that microparticles with optimized composition and properties would have better cell adhesion and hence cell growth into a tissue-like structure. Solvent-evaporation method was modified using sucrose as an additive to form large porous microparticles of poly(D,L-lactic-co-glycolic) (PLGA) and polylactide (PLA) polymers. Microparticles containing hydrophilic polymers (poly(vinyl alcohol) and chitosan) incorporated in their internal matrix structure were also formulated. Different formulations of microparticles were evaluated for physical properties, cell adhesion, and cell growth in culture. PLA microparticles containing poly(vinyl alcohol) (PVA) in the matrix structure (PLA-PVA) and treated with serum prior to cell seeding demonstrated better cell adhesion and cell growth than other formulations of microparticles. Cells were seen to grow into clumps, engulfing microparticles completely with time, and forming a 3-D tissue-like structure. Cell density of 1.5 x 10(6) cells per mg of microparticles was achieved in 9 days of culture, which was a 7-fold increase from the initial seeding cell density. The mechanism of better cell growth on PLA-PVA microparticles appears to be due to the PVA associated with the internal matrix structure of microparticles. These microparticles demonstrated better wetting in culture and also cell adhesion. In addition to tissue engineering applications, microparticles with cancer cells grown into a tissue-like structure in vitro can be potentially used as a model system for preclinical evaluation of the cytotoxic effect of anticancer agents.
authors.affiliation: Department of Pharmaceutical Sciences, College of Pharmacy, 986025 Nebraska Medical Center, Omaha, Nebraska 68198-6025, USA.
authors.forename: Sanjeeb K
authors.initials: SK
authors.lastname: Sahoo
authors.forename: Amulya K
authors.initials: AK
authors.lastname: Panda
authors.forename: Vinod
authors.initials: V
authors.lastname: Labhasetwar
mesh_terms: D001943:Breast Neoplasms / Q000473:pathology*; D002448:Cell Adhesion; D018929:Cell Culture Techniques; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000138:chemical synthesis / Q000737:chemistry / Q000627:therapeutic use*; D010316:Particle Size; D011091:Polyesters / Q000737:chemistry / Q000627:therapeutic use*; D011100:Polyglycolic Acid / Q000138:chemical synthesis / Q000737:chemistry / Q000627:therapeutic use*; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011108:Polymers / Q000138:chemical synthesis / Q000737:chemistry / Q000627:therapeutic use*; D016062:Porosity; D023822:Tissue Engineering / Q000379:methods*
chemical_list: D011091:Polyesters; D011108:Polymers; D000077182:Polylactic Acid-Polyglycolic Acid Copolymer; D011100:Polyglycolic Acid; D019344:Lactic Acid; C033616:poly(lactide)