Albumin microspheres as carriers for the antiarthritic drug celecoxib |
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Authors: | Hetal Thakkar Rakesh Kumar Sharma Anil Kumar Mishra Krishna Chuttani Rayasa Ramchandra Murthy |
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Institution: | (1) Drug Delivery Laboratory, Centre of Relevance and Excellence in New Drug Delivery system Pharmacy Department, Donor's Plaza, Opposite to University main office, MS University of Baroda, Fatehgunj, 390 002 Vadodara, India;(2) Division of Radiopharmaceuticals and Radiation Biology, Institute of Nuclear Medicine and Allied Sciences, Brig SK Mazumdar Road, 110 054 Delhi, India |
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Abstract: | The present study investigates the preparation of celecoxib-loaded albumin microspheres and the biodistribution of technetium-99m
(99mTc)-labeled celecoxib as well as its microspheres after intravenous administration. Microspheres were prepared using a natural
polymer BSA using emulsification chemical cross-linking method. The prepared microspheres were characterized for entrapment
efficiency, particle size, and in vitro drug release. Surface morphology was studied by scanning electron microscopy. Biodistribution
studies were performed by radiolabeling celecoxib (CS) and its microspheres (CMS) using99mTc and injecting arthritic rats intravenously. The geometric mean diameter of the microspheres was found to be 5.46 μm. In
vitro release studies indicated that the microspheres sustained the release of the drug for }6 days. Radioactivity measured
in different organs after intravenous administration of celecoxib solution showed a significant amount of radioactivity in
the liver and spleen. In case of celecoxib-loaded microspheres, a significant amount of radioactivity accumulated in the lungs.
No significant difference (P>.1) in the radioactivity was observed between the inflamed joint and the noninflamed joint following intravenous injection
of99mTc-CS. However, in case of the microspheres (CMS), the radioactivity present in the inflamed joint was 2.5-fold higher than
in the noninflamed joint. The blood kinetic studies revealed that celecoxib-loaded albumin microspheres exhibited prolonged
circulation than the celecoxib solution. |
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Keywords: | microspheres albumin celecoxib technetium-99m biodistribution |
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