Journal
INTERNATIONAL JOURNAL OF PHARMACEUTICS
Volume 410, Issue 1-2, Pages 145-152Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.ijpharm.2011.02.065
Keywords
Chitosan nanoparticle; Growth factors; Cytocompatibility; Proinflammatory response; Tissue engineering
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Growth factors are essential in cellular signaling for migration, proliferation, differentiation and maturation. Sustainable delivery of therapeutic as well as functional proteins is largely required in the pharmacological and regenerative medicine. Here we have prepared chitosan nanoparticles (CNP) and incorporated growth factors such as epidermal growth factor (EGF) and fibroblast growth factor (FGF), either individually or in combination, which could ultimately be impregnated into engineered tissue construct. CNP was characterized by Fourier transform infrared (FTIR) spectroscopy, Zeta sizer and high resolution transmission electron microscope (HRTEM). The particles were in the size range of 50-100 nm with round and flat shape. The release kinetics of both EGF and FGF incorporated CNP showed the release of growth factors in a sustained manner. Growth factors incorporated nanoparticles did not show any toxicity against fibroblasts up to 4 mg/ml culture medium. Increased proliferation of fibroblasts in vitro evidenced the delivery of growth factors from CNP for cellular signaling. Western blotting results also revealed the poor inflammatory response showing less expression of proinflammatory cytokines such as IL-6 and TNF alpha in the macrophage cell line J774 A-1. (C) 2011 Elsevier B.V. All rights reserved.
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