CDER risk assessment exercise to evaluate potential risks from the use of nanomaterials in drug products.

The Nanotechnology Risk Assessment Working Group in the Center for Drug Evaluation and Research (CDER) within the United States Food and Drug Administration was established to assess the possible impact of nanotechnology on drug products. The group is in the process of performing risk assessment and management exercises. The task of the working group is to identify areas where CDER may need to optimize its review practices and to develop standards to ensure review consistency for drug applications that may involve the application of nanotechnology. The working group already performed risk management exercises evaluating the potential risks from administering nanomaterial active pharmaceutical ingredients (API) or nanomaterial excipients by various routes of administration. This publication outlines the risk assessment and management process used by the working group, using nanomaterial API by the oral route of administration as an example.

Effect of altered temperature storage on the in vitro cellular uptake of liposome drug products.

The aim of this study was to evaluate whether temperature stress conditions affect the cellular uptake of liposomal doxorubicin, Doxil (DXL; Ortho Biotech, Raritan, New Jersey, USA), and liposomal daunorubicin, DaunoXome (DXM; Gilead Sciences, San Dimas, California, USA). Uptake of these cytotoxic compounds is essential for their pharmacological effect. Commercially available DXL and DXM were stressed for 6 days under altered temperature conditions of 22 and 50 degrees C, as compared to storage in their buffered formulations at the labeled temperature of 4 degrees C. The cellular uptake of the liposomal drugs was measured by fluorescence intensity in human ovarian SKOV-3 and murine macrophage J774A.1 cell lines following a 4-hour exposure to DXL or DXM. There was a 5- to 10-fold increase in the cellular uptake of DXL and DXM in both cell lines after stress exposure to 50 degrees C. Exposure of DXL to 22 degrees C stress decreased its uptake by SKOV-3 cells, when compared to exposure of DXL to 4 degrees C control conditions. A cell-based uptake assay may provide a means to assess changes in the functional activity of liposomes in conjunction with evaluation of their physicochemical properties in order to evaluate the stability and integrity of liposomes.